[0001] This invention relates to a panel, and more particularly a floor panel, as defined
in the claims.
[0002] In particular, it relates to a panel of the type wherein this panel comprises a core,
an upper side, a lower side and at least two opposite edges; wherein coupling parts
are provided on said two opposite edges; wherein said coupling parts have such a configuration
that two of such panels can be coupled to each other by means of a downward movement
of one of the panels in respect to the other, such that a locking is obtained in the
plane of the panels and perpendicular to said edges, as well as perpendicular to the
plane of the panels, wherein the coupling parts on said two edges comprise locking
parts ensuring said locking in the direction perpendicular to the plane of the panels.
Herein, this may relate, for example, to panels are concerned wherein at least one
of these locking parts forms part of a flexible part extending along the respective
edge and being bendable at least in the plane of the panel, as a result of joining
of two of such panels.
[0003] Panels of this type are known from
WO 2008/116623 and
WO 2009/033623 and have the feature that they can combine different advantageous characteristics
in one and the same panel. In the panels from the above-mentioned patent documents,
a flexible part is applied, which is made in one piece with the core. Hereby, a relatively
inexpensive production is possible, as such coupling parts can be realized exclusively
by means of machining treatments and no separate elements have to be provided in the
edge. In that the panels, at two edges, are provided with coupling means allowing
to couple such panels to each other by a downward movement, the panels, in the case
of floor panels, when also being provided with an appropriate profile on the other
edges, can be installed by means of using the user-friendly "angle-push" technique,
wherein each newly to install panel is connected to the preceding row of panels by
means of a turning technique, and wherein, as a consequence of the downward movement
associated therewith, it can be coupled automatically to the preceding panel in the
same row, by means of the coupling parts which have said flexible part. By, in this
case, making use of a flexible element which is bendable in the plane of the panel
and also substantially extends in the plane of the panel, said coupling parts allow
to realize a so-called "push-lock" coupling in the core material. However, the core
material of the panels of the herein above-mentioned patent documents shows a larger
tensioning strength within its plane than perpendicular to its plane, which mostly
is the case with wood composite board. This may possibly lead to tearing off of the
flexible part from the remainder of the core.
[0004] According to the embodiments which are described in
WO 2008/116623 and
WO 2009/033623, the flexible part consists of a lip which is attached at its distal ends, however,
for the rest, at the location of the zone where it is active as a locking part, is
entirely made free all around, in order to provide the required flexibility. These
known embodiments show the disadvantage that the flexible part made as a lip, in the
coupled condition of two panels, can perform a considerable deformation transverse
to the plane of the panels. This has as a consequence that, under certain irregular
loads, it is impossible to ensure that the panels will not show any height differences
at their decorative surfaces. When, for example, in the case of floor panels, a panel
is heavily loaded directly next to its coupled edge, for example, by the leg of a
heavy piece of furniture, said lip will bend in a plane transverse to the panels,
whereby the heaviest-loaded panel possibly will sag deeper into the mostly applied
elastically impressible underlying layer than the adjacent panel. Due to the fact
that the locking part in the active zone is made entirely free all around, an undefined
movement of the flexible part is obtained. In certain cases, for example, when dust
particles or small protruding parts of the core material interfere with the movement
of the flexible part, this may lead to difficulties when coupling the respective panels.
[0005] WO 2004/003314 and
WO 2010/142671 also describe panels of the above-mentioned type. Herein, a "push-lock" coupling
is realized in the core material of the panels. The panels from these documents comprise
a core, an upper side, a lower side and at least two opposite edges, wherein the panels
shows pertaining upper edges at said edges; wherein coupling parts are provided on
said two opposite edges; wherein these coupling parts have such a configuration that
the coupling parts of two such panels can be brought into each other by means of a
downward movement of one of the panels in respect to the other, wherein, in the coupled
condition of the panels, a locking in the plane of the panels and perpendicular to
said edges, as well as perpendicular to the plane of the panels can be obtained, wherein
said coupling parts for providing said locking in the plane of the panels and perpendicular
to said edges are provided with hook-shaped parts, which, in the coupled condition,
show contact surfaces which engage one behind the other. In the example of the mentioned
patent documents, the contact surfaces extend in a direction parallel to the respective
upper edge.
[0006] A disadvantage of the "push-lock" couplings of the state of the art, and then in
particular when they are realized in the core material of the panel, is that they
require a relatively large force for being assembled and/or that they are cumbersome
to be disengaged again. Disengaging the coupling sometimes will be necessary when
installing a floor covering consisting of such panels, when, for example, the length
of a panel has to be adapted.
[0007] WO 2004/048716 discloses floor panels that are provided with coupling parts that in coupled condition
allow for a mutual shifting of coupled floor panels in the longitudinal direction
of the edges concerned. As a consequence of the shifting the edges become more tightly
coupled and/or closer to one another. In the case of its figure 45, an embodiment
is disclosed, wherein these coupling parts have such a configuration that they can
be snapped onto each other by means of a downward movement. The coupling parts are
provided with hook-shaped parts showing contact surfaces that engage behind each other
in the coupled condition. Seen in a top plan view of the panel, the contact surfaces
globally extend in a direction different from the direction of the upper edges.
[0008] In the first place, the invention envisages an alternative panel, which, according
to various preferred embodiments, also offers a solution for the problems with the
panels of the state of the art.
[0009] To this aim, the invention relates to a panel, for example, a floor panel, wherein
this panel comprises a core, an upper side, a lower side and at least two pairs of
opposite edges, wherein the panel comprises pertaining upper edges at a first pair
of said opposite edges; wherein coupling parts are provided at said two opposite edges
of said first pair; wherein these coupling parts have such a configuration that the
coupling parts of two of such panels can be brought into each other by means of a
downward movement of one of the panels in respect to the other, such that the panels
are in a coupled condition, wherein in the coupled condition of the panels a locking
in a horizontal direction, namely, in the plane of the panels and perpendicularly
to said edges, as well as in a vertical direction, namely, perpendicularly to the
plane of the panels, can be obtained, wherein said coupling parts for providing said
locking in the plane of the panels and perpendicularly to said edges are provided
with hook-shaped parts, which, in the coupled condition, show contact surfaces which
engage one behind the other, wherein said contact surfaces, viewed in a top plan view
of the panel, globally extend in one or more directions differing from the direction
of said upper edges, characterized in that said panel, at the second pair of opposite
edges, also is provided with coupling means allowing to couple two of such panels
at these edges by providing the respective coupling means in each other, wherein these
coupling means comprise a female coupling part and a male coupling part, and, when
coupling, the male coupling part is provided in the female coupling part by means
of a turning movement around the edges to be coupled, whereas said downward movement
at said first pair of opposite edges is obtained by means of said turning movement
at said second pair of opposite edges. In that the contact surfaces do no longer extend
parallel to the direction of the pertaining upper edges, a number of new possibilities
are obtained.
[0010] According to a new possibility, a simpler disassembly of panels coupled together
can be obtained. Such possibility can be performed by applying contact surfaces which,
in one or more portions, extend straight along the respective edge, wherein the distance
between the pertaining upper edge and said one or more portions diminishes along this
edge, respectively seen in the same direction, or possibly remains the same. Instead
of being straight, one or more of these portions may also show a continuous curvature.
In that the distance to the upper edge respectively diminishes in the same direction,
a coming loose of the panels can be obtained with a limited shifting of the coupled
panels along the respective edges.
[0011] According to the invention, the panel is also provided with coupling means at the
other pair of opposite sides, which coupling means allow coupling two such panels
at these edges by providing the respective coupling means in each other, wherein these
coupling means comprise a female coupling part and a male coupling part, and wherein,
during coupling, the male coupling part has to be provided in the female coupling
part. The aforementioned contact surfaces preferably extend such that the aforementioned
distance respectively increases, viewed in the direction of the male coupling part
towards the female coupling part. Such configuration of the contact surfaces allows
that a panel can be dismounted from a row of floor panels without necessarily having
to dismount other floor panels from the same row.
[0012] According to a second possibility, with a coupling of the respective edges, a more
precise alignment of the other pair of edges can be obtained. This allows that, when
installing a floor covering, in particular when installing the first and second rows
thereof, it is possible to start more smoothly. This also allows applying certain
installation methods more smoothly, for example, an installation method wherein a
number of elongated floor panels are coupled at the short sides in a row and thereafter
the obtained row is coupled to the long pair of edges of an already existing row.
In such case, this preferably relates to the short pair of edges showing the not-parallel
extending contact surfaces, such that, when coupling the short sides, a good alignment
of the long edges is obtained.
[0013] Preferably, said hook-shaped parts comprise, on the one hand, an upper hook-shaped
portion with a flange protruding laterally near the upper side of the panel, said
flange being provided with a downward-directed part, and, on the other hand, a lower
hook-shaped part with a flange protruding laterally near the lower side of the panel,
said flange being provided with an upward-directed part, wherein said contact surfaces
are formed between the aforementioned downward-directed part and the aforementioned
upward-directed part. Herein, the upper hook-shaped part is intended for being provided
in the lower hook-shaped part, more particularly with the downward-directed part in
the recess adjacent to the upward-directed part. Preferably, the contact surfaces
of the upward-directed part are directed to the pertaining upper edge.
[0014] Preferably, said contact surfaces, viewed in a cross-section perpendicularly to the
respective edge, extend vertically, or inclined or curved from the top downward, in
the direction of the edge provided with the lower hook-shaped part.
[0015] Preferably, the coupling parts at said two edges of said first pair comprise coupling
parts ensuring said locking in the direction perpendicular to the plane of the panels,
wherein these locking parts show respective contact surfaces, which resist the coming
loose of the upper hook-shaped part from the lower hook-shaped part. Preferably, this
relates to contact surfaces which extend in a flat manner. The locking parts and pertaining
contact surfaces can be performed according to different possibilities.
[0016] According to a first possibility for performing the locking parts and contact surfaces,
they are substantially formed as a tongue and a groove, the latter being bordered
by a lower and an upper lip. Preferably, said contact surfaces are situated on the
upper side of said tongue and on the lower side of said upper lip.
[0017] According to a second possibility for performing the locking parts and contact surfaces,
they are substantially formed by a lateral protrusion on the lower side of the edge
with the upper hook-shaped part and an undercut on the lower side of the lower hook-shaped
part, which cooperate with other. Preferably, said contact surfaces are situated on
the upper side of the protrusion and on the lower side of the lower hook-shaped part.
In this manner, for example, a configuration similar to that of the also above-mentioned
documents
WO 2004/03314 and
WO 2010/142671 can be applied.
[0018] No matter how the locking parts and contact surfaces are realized, they preferably
extend substantially parallel to the upper side of the panels. The possible deviation
from the angle formed by the contact surfaces preferably is limited to a maximum of
60° and still better a maximum of 45° or 30°, such that still an acceptable locking
in vertical direction can be obtained.
[0019] Preferably, the coupling parts at said first pair, apart from the above-mentioned
contact surfaces on the locking parts, also show one or more contact surfaces restricting
the movement of the upper hook-shaped part towards the lower hook-shaped part. In
the case of the above-mentioned first possibility, as well as in the case of the above-mentioned
second possibility, these contact surfaces preferably are located, on the one hand,
on the lower side of the upper hook-shaped part, or more particularly on the lower
side of the downward-directed part thereof, or on the lower side of said tongue and,
on the other hand, on the upper side of the lower hook-shaped part, or more particularly
on the upper side of the recess and/or the upward-directed part thereof, or on the
upper side of said lower lip of the groove.
[0020] Preferably, the contact surfaces which are active in the locking in horizontal direction,
namely in a direction perpendicular to the respective edges and in the plane of the
coupled panels, viewed in a top view of the panel, globally extend in a direction
forming an angle with the upper edges, wherein this angle is located between 0.5°
and 5°, or from 1° to 2°.
[0021] Preferably, these contact surfaces, viewed in a top view of the panel, globally extend
on a straight line forming an angle with the upper edge of the panels. Preferably,
they extend continuously or as good as continuously over this straight line.
[0022] As already mentioned above, the panel of the invention, is also provided with coupling
means at the other pair of opposite sides, which coupling means allow coupling two
of such panels at these edges by providing the respective coupling means in each other,
wherein these coupling means comprise a female coupling part and a male coupling part,
and wherein, during coupling, the male coupling part has to be provided in the female
coupling part. Preferably, the female and the male coupling part at this pair of edges
allow at least that they can be provided in each other by means of a turning movement
around the edges to be coupled. In combination with the preferred embodiment mentioned
here, said contact surfaces, cooperating in the locking in horizontal direction, viewed
in a top view of the panel preferably extend from said male coupling part towards
the female coupling part in a direction away from the edge which is provided with
the lower hook-shaped part. By means of this embodiment, a particularly smooth disassembly
can be obtained.
[0023] According to a preferred embodiment, the invention relates to a panel of the above-mentioned
type, with the characteristic that the panel, at least at one of said opposite edges,
comprises a synthetic edge part of a material different from the core material, wherein
the coupling parts on said two edges comprise locking parts ensuring said locking
in the direction perpendicular to the plane of the panels, wherein at least one of
these locking parts forms part of a flexible part made in one piece with said synthetic
edge part and extending along the respective edge and being bendable at least in the
plane of the panel, as a result of the joining of two of such panels. Due to the fact
that the flexible part is realized in a synthetic edge part, the material of this
part can be chosen in view of a smooth coupling of the respective edges. The synthetic
edge part preferably consists of a material with isotropic properties. This means
that this material shows the same properties in all directions, at least as far as
the tensile force and/or bending strength of this material are concerned. By applying
such material, the risk of tearing off of the flexible part is minimized to a great
extent. For the core material then, for example, indeed an anisotropic material can
be applied, for example, a core material showing a larger tensile force within its
plane then perpendicular to its plane, which mostly is the case with wood composite
board, such as MDF or HDF.
[0024] The synthetic edge part preferably is substantially free from wood particles. This
means that this edge part comprises less than 50 percent by weight of such wood particles.
Still better, this edge part comprises less than 15 percent by weight of such particles,
or this edge part even is free from wood particles. In that the edge part substantially
is free from wood particles, this edge part can be provided with smoothly finished
profiled edge surfaces, for example, without any small protruding parts, such that
any interference of such parts during coupling will be minimized.
[0025] Preferably, on the respective edge by means of the synthetic edge part a water-repellent
or waterproofing protection of the core material is realized.
[0026] As a material for the synthetic edge part, use can be made of a polyurethane, preferably
obtained on the basis of a two-component system, such as on the basis of polyol and
isocyanate. Polyurethane can adjusted to different hardnesses and is a flexible material
in respect to production possibilities. For example, it is easy to cast. By means
of such two-component system, a chemical adherence to wood particles, which possibly
can be present in the substrate material, can be obtained. A chemical adherence is
to be preferred above a mechanical adherence in respect to the strength thereof.
[0027] Preferably, said synthetic material of the edge part relates to a thermo-hardening
synthetic material, for example, a material on the basis of polyurea, epoxy or polyurethane.
Thermo-hardening materials do not require any extrusion process for processing them
and allow smoother production processes. Herein, polyurethane is preferred as a result
of the herein above-mentioned features thereof, and in particular the adjustable flexibility
and casting ability thereof. The hardness of polyurea and epoxy is difficult to adjust
to the requirements of the present invention. In such case, the hardness of polyurea
and epoxy is of such kind that it is difficult to obtain a user-friendly and/or creak-free
coupling. Moreover, polyurea cannot be cast, which complicates the applicability thereof
in a mass production process.
[0028] Suitable synthetic material for realizing the synthetic edge parts are, for example,
polyurethane elastomers, such as Elastocast by BASF, Baytec by BAYER or Rencast by
HUNTSMAN. As a possible foaming filler, Expancel by Akzo Nobel can be applied.
[0029] It is clear that by a thermo-hardening material, a material is meant which, when
heated up to a certain temperature, undergoes an at least partially irreversible chemical
change, such as a cross-linking reaction. Preferably, a thermo-hardening material
on the basis of a two-component system is used, such as so-called thermo-hardening
urethane resin or TSU (ThermoSetting Urethane).
[0030] Preferably, at least the attachment of the edge part to the core material is obtained
by hardening said synthetic material. Preferably, this herein relates to a direct
attachment without intermediate material layers and/or substances, such as glue. Preferably,
in combination therewith, also the attachment of the edge part to the possible top
layer is obtained by hardening said synthetic material; preferably, this herein also
relates to a direct attachment. The direct attachment of the synthetic material to
the lower side of the top layer moreover may lead to an increased resistance against
delaminating of such top layer. Namely, there is a risk of delamination, for example,
when manufacturing panels, when the edges of the panel are provided with profiles
by means of cutting treatments, such as milling operations. A risk of delamination
also exists during installation, in particular when the panels during coupling chafe
with their top layers against each other. Here, this risk is very pronounced, as the
panels according to the invention are provided with coupling means at the respective
edges, wherein these coupling means can be connected by means of a downward coupling
movement. A risk of delamination also exists when using a floor covering which is
composed of panels, and is present in a pronounced manner, for example, underneath
the castors of office chairs.
[0031] Preferably, the panel comprises such synthetic edge part on both edges of a pair
of opposite sides. Herein, the attachment, construction or dimensions of the respective
edge parts do not necessarily have to be identical, however, preferably they are.
They may, each individually, show the characteristics of one or more preferred embodiments
of the second aspect. The invention thus also relates to all possible combinations
of such characteristics.
[0032] Preferably, the synthetic material extends at least over 80 percent of the thickness
of the core material. In this manner, the moisture sensitivity of possibly present
core material on the edge, i.e. 20 percent of the thickness or less, also is limited.
Preferably, the synthetic material extends over 90, 95% or more of the thickness of
the core material, such that the moisture sensitivity is restricted even further.
[0033] Preferably, the synthetic edge part also extends at least over 80 percent, 90 percent,
95 percent or more of the contour of the profiled edge part present on the respective
edge. Preferably, the complete edge of the core material is covered by the synthetic
edge part, such that no exposed surfaces of the core material are present on the respective
edge.
[0034] Preferably, the synthetic edge part extends at least over the entire thickness of
the core material. In this manner, moisture sensitivity of possibly remaining core
material on the respective edge is maximally excluded, and additional covering layers
with water-repellent substance of remaining core material on the respective edge are
not required.
[0035] Preferably, the synthetic material extends from the lower side of the panel into
the possible top layer. By means of this embodiment, it is obtained in a reliable
manner that no remaining core material is present directly below the top layer. In
this way, negative effects, such as swelling of the edge, which can push up the top
layer, can be avoided. If, contrary to the present preferred embodiment, a residual
amount of core material is present between the edge part and the top layer, at least
this portion of the core material preferably comprises a covering on the basis of
a water-repellent substance. In this manner, edge swelling, which might push up the
top layer, also can be avoided to a certain extent. Also possibly remaining core material
below the edge part additionally can be sealed with such water-repellent substance.
[0036] Preferably, on all edges of the panel the core material is finished in a watertight
manner. It is clear that on the edge or edges where the edge part of the invention
is situated, this watertight finishing of the core material preferably is at least
partially obtained by the presence of said edge part.
[0037] Preferably, said connection between the edge part and the core material extends over
a boundary surface, which comprises partial surfaces extending transverse to the normal
of the surface of the panel. Such boundary surface increases the strength of the connection
between the core material and the synthetic edge part. Moreover, it is possible to
save synthetic material by means of such configuration, in that said boundary surface
then can follow the profile of the edges to a certain extent. Preferably, said boundary
surface is performed such that it extends from the top downwards towards the bulk
of the substrate material, or that an uppermost point of this boundary surface is
situated closer to the edge of the top layer than a lowermost point of the boundary
surface. Such configuration allows a smooth production of the panels.
[0038] Preferably, the panel comprises at least one support part which, with two of such
coupled panels, when exerting a force in a direction opposed to said downward movement,
forms a support against bending of the flexible part in a direction transverse to
the plane of the coupled panels. By equipping the panel with such support part, the
advantage is obtained that the flexible part can not, or at least less, bend in an
undesired direction and that undesired height differences are made almost impossible,
by which it can be guaranteed that under all conditions the panels will remain with
their decorative side in the same plane.
[0039] Herein, said locking parts preferably are formed by parts which engage one behind
the other by means of a snap movement, which allows a smooth coupling.
[0040] In a practical embodiment, said flexible part is made as a lip, whereas the other
locking part, which is intended for cooperating therewith, is made as a tongue-shaped
portion, which, during connecting two of such panels, causes an elastic bending in
the lip, such that this tongue-shaped portion can get seated behind the lip by means
of a snap movement.
[0041] Preferably, the support part is a portion of the synthetic edge part, which offers
support to the flexible part, which support prevents that the flexible part, in the
coupled condition, can bend in a direction transverse to the plane of the panels.
By integrating the support part together with the flexible part into the synthetic
edge part, such support point can be realized in a simple and accurate manner.
[0042] According to a particular preferred embodiment, the flexible part and the support
part cooperate with each other by means of a releasable and/or deformable connection.
An advantage thereof is that there is no play between the two parts. A very accurate
and reliable coupling movement of the flexible part can be obtained.
[0043] According to another particular characteristic, the panel is characterized in that
said flexible part is suspended such that, apart from a bending in the plane of the
panel, it also performs a tilting movement and/or torsional movement. Such tilting
movement offers the advantage that the locking part formed at the flexible part often
performs a more controlled movement, which allows a better cooperation with the opposite
locking part. Preferably, said deformable connection forms a hinge, around which the
flexible part, seen in a cross-section through the hinge, can tilt or rotate.
[0044] According to another embodiment, the support part is formed by a fixed part of the
panel, with a contact surface, along which the flexible part can be displaced. In
this manner, a controlled displacement is possible and, thus, a bending in an undesired
direction becomes impossible.
[0045] Practically seen, it is preferred that the flexible part substantially extends in
the plane of the floor panel and comprises a contact surface which is intended for
cooperating with a locking part of a coupled floor panel; that the flexible part,
at least on the rear side, as well as on the contact surface, is free in respect to
the core and/or the portion of the synthetic edge part situated internally within
the panel; and that, in the direction of its lateral edge, at least at one of its
two ends, it is in connection with the synthetic edge part. In the most preferred
embodiment, the flexible part is at both ends in connection with the synthetic edge
part.
[0046] It is clear that the support portion, in the coupled condition, preferably provides
for a support function free from play. However, it is also clear that minor deviations
may occur, wherein, however, a possible play in the support function preferably is
kept smaller than 0.3 mm und still better smaller than 0.2 mm. By the play in the
support function, it is meant inasmuch the flexible element can bend out transversely
to the plane of the floor panel before coming into contact with a support portion
especially provided for this purpose, at least in embodiments in which they are not
in one piece.
[0047] Further, for the locking in the plane of the panels and perpendicular to said edges,
preferably use is made of hook-shaped parts, which, in the coupled condition of two
of such panels, engage behind each other. In a preferred embodiment, the aforementioned
hook-shaped parts are made as a lower hook-shaped part with a flange protruding laterally
near the lower side of the panel, said flange being provided with an upward-directed
part, and an upper hook-shaped part with a flange protruding laterally near the upper
side of the panel, said flange being provided with a downward-directed part, wherein
said flexible part is formed on the edge comprising the lower hook-shaped part, in
a material part of the synthetic edge part which is situated above this hook-shaped
part. Such location of the flexible part offers a stable construction, as in this
manner the flexible part is situated at a location where the surrounding panel material
is thickest and the hook-shaped parts are not impaired by cuts, and moreover the locking
part formed on the flexible part is located close to the upper edge of the panel.
[0048] It is clear that the panel can comprise a plurality of said flexible parts along
the same edge.
[0049] The invention is particularly advantageous with embodiments where the core consists
of a wood composite, more particularly a wood composite in the form of a board which
extends according to the plane of the panel and which is created by pressing a mat
of wood components which are bonded together by means of a binding agent. Namely,
such wood composite allows manufacturing panels in an inexpensive manner, and thanks
to the invention it is now possible to integrate so-called "push-lock" couplings in
such panels in an effective manner by using a synthetic edge part in another material.
The fact that the material of such boards can easily slide off according to planes
parallel to the plane of the board, now, due to the presence of the synthetic edge
part, has a reduced influence on the herein-described couplings.
[0050] In practice, the core preferably will consist of wood fiberboard, more particularly
LDF (Low Density Fiberboard), MDF (Medium Density Fiberboard) or HDF (High Density
Fiberboard). LDF or MDF are preferred, as this forms a cheaper filler material for
the panel. In the case that on the other of the respective two opposite edges and/or
on the other pair of opposite edges, use is made of coupling means which are made
in one piece with the core material, then preferably MDF or HDF are used, such that
sufficiently strong coupling parts can be provided on the edges, too. It is not excluded
that such coupling parts or coupling means made In one piece are provided with a covering
layer, for example, for obtaining a certain waterproof or water-repellent protection
of the core material on the respective edges.
[0051] In the most practical form, the core as such is made monolithic, for example, in
the form of a continuous MDF or HDF board, of course with the exception of the one
or more edge parts present according to the invention.
[0052] The invention is also suited for being applied in so-called "engineered wood" panels,
more particularly panels having a core consisting of a plurality of transverse-directed
elements, for example, wooden laths or the like. By realizing such transverse-directed
element in synthetic material at least at one end, a coupling part with a flexible
part, as described herein above, can be integrated therein in an adequate manner,
whereas for the other elements at choice use can be made of any appropriate material.
For most of the other transverse-directed elements, thus, also inexpensive wood can
be applied.
[0053] In the most preferred embodiment, such panel is characterized in that it is rectangular,
thus, oblong or square, and that it is provided, on all four edges, with coupling
parts allowing to perform a mechanical locking with surrounding panels, such that
on all four edges a locking is obtained in the plane of the panels and perpendicular
to said edges as well as perpendicular to the plane of the panels. This is of particular
importance with floor panels, where, as known, no mutual height differences may occur
around the entire circumference.
[0054] According to the invention, the panel is characterized in that it is provided, on
two edges, with said coupling parts allowing that two of such panels can be coupled
to each other by means of a downward movement of one of the panels in respect to the
other, whereas the other two edges are provided with coupling parts allowing that
two of such panels can be engaged in each other by means of a turning movement. This
allows installing such panels according to the so-called, already set forth herein
above "angle-push" technique.
[0055] Preferably, said flexible part, with the exception of possible cuts forming an essential
part of a profile formed on the coupling parts, substantially is cut free by only
a single cut, wherein this cut only extends over a part of the thickness of the panel
at the location where the cut is situated. An advantage thereof is that the material
of the panel is not weakened transversely and across, and moreover only one particular
cut has to be realized.
[0056] Preferably, the flexible part is bordered at its rear side by a cut, wherein this
cut has an open end and a closed end and/or bottom; and that the flexible part globally
decreases in cross-section in the direction from the open end towards the closed end
and/or the bottom. Such configuration allows a smooth movement of the flexible part.
[0057] Preferably, the flexible part is attached such that, during coupling, it performs
only a rotational and/or torsional movement. As set forth above, such rotational and/or
torsional movement offers the advantage that it can take place in a very controlled
manner. Preferably, this is realized by making the above connection, at the location
of the support part, uninterruptable, however, bendable, possibly such that it can
be partially torn, by which a purely horizontal displacement, as known from
WO 2008/116623 and
WO 2009/033623, is completely excluded.
[0058] With the intention of better showing the characteristics of the invention, hereafter,
as an example without any limitative character, some preferred embodiments are described,
with reference to the accompanying drawings, wherein:
Figure 1 in top plan view represents a panel, more particularly a floor panel, not
pertaining to the invention, but illustrative for some features thereof;
Figure 2, at a larger scale, represents a view according to line II-II represented
in figure 1;
Figure 3 represents a cross-section according to line III-III in figure 2;
Figures 4 to 6 represent how two panels, such as those of figure 1, can be coupled
to each other by means of a downward movement;
Figures 7 and 8 represent cross-sections according to lines VII-VII and VIII-VIII
in figures 4 and 5, respectively;
Figures 9 to 11, for a number of possible conditions, variants, respectively, represent
the part indicated by F9 in figure 5;
Figure 12, at a larger scale, represents a cross-section according to line XII-XII
in figure 1;
Figure 13 schematically, in a cross-section according to line XIII-XIII in figure
2, represents how the represented recess can be provided in the panel;
Figures 14 to 16 represent a part of a variant, for three different conditions;
Figure 17, in a view similar to that of figure 5, represents another variant;
Figure 18 illustrates an embodiment with the characteristics of the invention;
Figures 19 and 20, at a larger scale, represent cross-sections respectively of the
lines IXX-IXX and XX-XX represented in figure 18;
Figures 21 and 22 represent variants in a view similar to that of figure 6;
Figures 23 and 24 represent a variant, respectively in views similar to those of figures
19 and 20;
Figures 25 and 26 represent views according to the arrows F25 and F26 represented
in figure 23, respectively on the lower hook-shaped part and the upper hook-shaped
part;
Figures 27 to 29, at a larger scale, represent a view on the area indicated by F27
in figure 18, however, for variants.
[0059] In figures 1 to 12, a panel 1, in this case a floor panel, not pertaining to the
invention, but illustrative for some features thereof, is represented. The panel 1
is rectangular and oblong and consequently has a pair of opposite long sides 2-3 and
a pair of opposite short sides 4-5, which are determined by edges 6-7 and 8-9 formed
at the panel.
[0060] The panel 1 further comprises a core 10, an upper side 11 and a lower side 12.
[0061] At the opposite edges 8-9, coupling parts 13-14 are provided, which have such a configuration
that two of such panels can be coupled to each other at such edges by means of a downward
movement of one of the panels 1 in respect to the other, for example, as illustrated
in figures 4 to 6. Also, these coupling parts 13-14 are configured such that in the
coupled condition a locking is obtained in the plane of the panels 1 and perpendicular
to said edges 8-9, as well as perpendicular to the plane of the panels 1, in other
words, either in the directions R1 as well as R2 indicated in figure 6.
[0062] In order to obtain the locking in the plane of the panels 1 and perpendicular to
said edges 8-9, thus, in this case to obtain that the coupled floor panels 1 are locked
against horizontal drifting apart, the coupling parts 13-14 are provided with locking
parts in the form of hook-shaped parts 15-16, which, in the coupled condition, engage
behind each other. These hook-shaped parts 15-16 comprise an upper hook-shaped part
15 with a flange 17 protruding laterally near the upper side of the panel 1, said
flange being provided with a downward-directed part 18, and a lower hook-shaped part
16 with a flange 19 protruding laterally near the lower side of the panel 1, said
flange being provided with an upward-directed part 20. The parts 18 and 20 comprise
contact surfaces 21-22 which, in the coupled condition of two of such panels 1, engage
behind each other. In the direction towards each other, the panels 1 have contact
surfaces 23-24 which are situated near their upper edges.
[0063] In order to obtain the locking perpendicular to the plane of the coupled panels,
the edges 8-9 are provided with locking parts 25 and 26, with respective contact surfaces
27-28, which prevent that the hook-shaped parts 15-16 can become detached from each
other. In the other direction, the mutual displacement is prevented in that the hook-shaped
parts 15-16 come into mutual contact by means of one or more contact surfaces 29-30.
[0064] In the example, respectively on each of the edges 8-9 two locking parts 25, as well
as two locking parts 26 are provided, distributed over the length of the respective
edge. However, it is clear that according to not represented variants also only one
locking part per edge could be used, or more than two per edge. At least one of these
locking parts, in this case respectively at least the locking part 26, forms part
of, or is formed by, a flexible part 31 realized in one piece with a synthetic edge
part 10A present there, which flexible part extends along the respective edge 9 and
is bendable at least in the plane of the panel, as the consequence of joining two
of such panels, such that the locking parts 25-26 can engage behind each other by
means of a snap movement. By the term "as a consequence of joining" is meant that
during the joining movement a deformation manifests itself at least temporarily.
[0065] In the example, the synthetic edge part 10A extends over the entire length of the
respective edge 5.
[0066] As represented in the example, and as can be seen more particularly in figure 8,
such flexible part 31 preferably is performed as an elastically bendable lip.
[0067] In order to obtain such portion which is flexible, this portion for the major part
is detached from the remainder of the material of the core. In the represented embodiment,
this is realized by means of respectively a cut 32 at the rear side of the part 31,
and a cut 33 which substantially may be a part of the coupling profile to be formed.
[0068] In this example, the cut 32 does not extend transverse through the panel, but up
to a certain depth, and thus also has a most inwardly situated side or bottom 34.
[0069] The flexible part 31 substantially extends in the plane of the panel 1 and, at its
ends 35, is in connection with the synthetic edge part 10A. In the present case, the
actual core 10 of the panel 1 consists of a core material, which has a larger tensile
force in its plane than perpendicular to its plane, which mostly is the case with
wood composite board.
[0070] Each respective locking part 25 preferably is made as a tongue-shaped part, which,
during connecting two of such panels 1, causes an elastic deformation in the lip-shaped
part, such that this tongue-shaped part can be positioned behind the lip by means
of a snap movement. In the example, each tongue-shaped part has a length L which is
smaller than the length of the lip-shaped part, as can be seen in particular in figure
8.
[0071] According to a particular preferred characteristic, the panel 1 comprises at least
per flexible part 31 a support part 36, which, with two of such coupled panels 1,
when exerting a force in a direction opposed to said downward movement, forms a support
against bending of the flexible part in a direction transverse to the plane of the
coupled panels 1.
[0072] The support part 36 is situated at the height of the side of the flexible part 31
which is situated opposite to the locking side 37 of this flexible part.
[0073] The support part 36 is a part of the synthetic edge part 10A, which offers support
to the flexible part 31, which support prevents that the flexible part can bend out
in a direction transverse to the plane of the panels, by which the panels no longer
would remain co-planar.
[0074] In the represented example, the cooperation between the flexible part 31 and the
support part 36 is performed by means of a releasable and/or deformable connection
38 between a movable portion of the flexible part and another part of the respective
edge of the panel, which offers a permanent support.
[0075] It is noted that in the example, said flexible part 31 is suspended such that, apart
from a bending in the plane of the panel, it can also perform a tilting movement and/or
torsional movement W, as indicated in figure 5.
[0076] The example shows that in the case of oblong panels 1, it is preferred that the herein
above-described coupling parts preferably are located at the short sides 4-5. At the
other sides 2-3, too, as represented in figure 12, coupling parts 39-40 are present,
which allow making a mechanical locking with surrounding panels, such that at all
four edges a locking is obtained in the plane of the panels and perpendicular to the
aforementioned edges, as well as perpendicular to the plane of the panels. These coupling
parts 39-40 can be of any kind. Preferably, however, they allow at least that two
panels 1 can be engaged in each other at the respective sides 2-3 by means of a turning
movement W. In this manner, such panels 1, when being installed in successive rows,
can be installed very smooth by coupling such panel each time with a long side by
means of a turning movement to the preceding row of panels and providing for, during
turning down, that, as a consequence of the downward movement, as represented in figures
4 to 6, automatically a connection is created between the short side of the new panel
and the short side of the preceding panel installed in the same row.
[0077] The functioning of the connection at the short sides takes place in more detail as
described below. When putting down a panel 1 to be coupled, the flexible part 31 is
impressed by means of the locking part, as illustrated in figures 5 and 8. When moving
still further down, the flexible part 31 springs back, by which a locked condition
is obtained, as illustrated in figure 6.
[0078] The deformation in the flexible part 31 can manifest itself in different manners,
depending on the location in this part and the strength properties of the material
of the edge part 10A, which will be explained herein below by means of a number of
possibilities with reference to figures 9 to 11. Figure 9 shows only a bending in
the connection 38. Figure 10 shows a partial tearing at the location of the connection
38. In figure 11, the connection is totally interrupted, but the support part 36 still
forms a support.
[0079] In figure 13, it is also schematically represented how, for example, the cut 32 can
be applied in the panel 1 by means of a rotating cutting tool 41.
[0080] In figures 14 to 16, a variant, not pertaining to the invention, is represented,
wherein the support part 36 is formed by a fixed portion of the panel 1, with a contact
surface 41 along which the flexible part 31 can be displaced. The difference in comparison
with the preceding embodiment is that the flexible part 31 already from the beginning
is completely free from the support part 36, such as in the initial condition of figure
14. The configuration then further is such that, when deforming the flexible part
31 during coupling of two panels 1, first the flexible part 31 is moved with its edge,
in this case upper edge 42, under the contact surface 41, as illustrated in figure
15, whereas this flexible part 31, in the final locked condition of figure 16, cannot
move completely back to the original condition and remains making contact with the
contact surface 41, by which the desired support remains obtained and ensured.
[0081] Figure 17 represents another variant not pertaining to the invention, wherein the
cut 32 is not standing perpendicular on the plane of the panel, but is directed inclined,
more particularly with an inclination in the direction as represented. This offers
the advantage that the flexible part 31 can move more inward, whereas it still has
a reasonable thickness.
[0082] It is clear that different variants are possible. In the example, both locking parts
25-26 are realized as portions which do not extend continuously over the length of
the respective edges. According to a variant, the edge on which one of these locking
parts is present in fact can be realized with a continuous profile, for example, by
providing the tongue-shaped part on the flexible part, such analogous to the embodiment
which is known from figures 1 to 3 of
WO 2008/116623.
[0083] In figure 6, with dashed line 44 a variant of the cut 32 is represented, with an
inclined course of the bottom. Hereby, the risk of tearing towards the left can be
reduced.
[0084] In the figures, the panels 1 are represented with a one-piece core 10. However, this
does not necessarily have to be the case. The core 10 may be composed, for example,
of a plurality of layers and/or parts, wherein at the respective edge then a different
material is situated, which forms the synthetic edge part 10A.
[0085] Further, it is clear that the panels of the invention, certainly in the case of a
floor panel, normally will be provided with a decorative layer on the upper side.
On the lower side, too, possibly a backing layer can be provided. Herein, this may
relate to any materials. A number of examples are: laminate composed of one or more
layers, for example, of the DPL type (Direct Pressure Laminate) or HPL type (High
Pressure Laminate); a decor printed directly on the panel, whether or not provided
with additional top layers and/or additional underlying layers; veneer or a decorative
layer formed of wood parts; vinyl, linoleum or the like; stone; cork or a product
on the basis of cork; a carpet layer; a foil or film.
[0086] According to the most preferred embodiment of the present invention, the panel relates
to a floor panel with a top layer 45 provided on the upper side 11 and a backing layer
or underlying layer 46 provided on the lower side 12. Herein, said top layer 45 preferably
comprises at least a motif and a situated there above transparent or translucent layer.
Preferably, said underlying layer 46 or backing layer as well as said transparent
or translucent layer comprise thermoplastic synthetic material, whereas said core
10 comprises thermo-hardening synthetic material. For the thermo-hardening synthetic
material, preferably a synthetic material is chosen which hardens by means of a polycondensation
reaction. The thermo-hardening synthetic material preferably is chosen from the list
of melamine formaldehyde resin, urea formaldehyde resin, melamine urea formaldehyde
resin and phenol-based resin. The thermo-hardening synthetic material can be present,
for example, in the core material as a binding agent for particles of a board material,
such as for binding of wood particles in wood particle board or wood fiberboard, LDF
(Low Density Fiberboard), MDF (Medium Density Fiberboard) or HDF (High Density Fiberboard).
Said thermoplastic synthetic material preferably relates to a vinyl-based synthetic
material. Preferably, said top layer and/or said underlying layer or backing layer
comprise PVC (PolyVinyl Chloride) or another vinyl compound, such as EVA (Ethylene
VinylAcetate). Still better, said top layer and/or underlying layer or backing layer
substantially consist of one or more of these synthetic materials, preferably substantially
of PVC. Preferably, said transparent or translucent layer substantially consists of
PVC and/or plasticizer.
[0087] Preferably, the core material has a density of more than 300 kilograms per cubic
meter, and still better of more than 500 kilograms per cubic meter. The core material
preferably has a thickness of four, five millimeters or more. The use of an actual
core having a density of more than 500 kilograms per cubic meter allows profiling
one or more edge parts of the core material for forming coupling means thereon, such
as represented in figure 12 for the long pair of opposite sides 6-7. In this manner,
the qualitative core material contributes to the locking of two of such floor panels
1, which are connected at their edges. Possibly, such profile can be provided with
a covering layer 47 of moisture-repellent or sealing substance, such as is the case
in the example of figure 12. To this aim, figure 12 represents coupling means 39-40,
which in principle are formed in one piece with the core 10, however, are provided
with such sealing covering layer 47. This covering layer 47 can have, for example,
a global thickness of 0.05 to 0.3 millimeters. Preferably, for the water-repellent
substance, polyurethane-based hot-melt glue is used.
[0088] Preferably, the core 10 or the core material consists of a single layer. However,
it is not excluded that use could be made of a plurality of layers. According to a
particular example thereof, said substrate consists of a MDF or HDF board material,
above which a cork layer is provided. In such case, the cork layer is located between
said motif and the substrate. Of course, also other layers may be situated between
the cork layer and the motif, such as a possible back layer integrated in the top
layer, which back layer will be described further herein below by means of a particular
embodiment.
[0089] Preferably, said top layer is connected to the core material by means of a glue layer.
[0090] According to a preferred embodiment, said top layer and/or said underlying layer
or backing layer comprise filler material, such as chalk or wood fiber. In the case
of the top layer, such filler material preferably is concentrated underneath the motif,
for example, in the possible back layer, which will be described further herein below
by means of a particular embodiment.
[0091] According to a particular embodiment, said top layer as such is composed of at least
a back layer, a motif or pattern provided thereon and a transparent or translucent
wear layer. Said back layer preferably has a thickness which is 45 percent or more
of the overall thickness of the top layer. Such back layer preferably consists of
a vinyl compound or possibly a polyurethane compound, wherein preferably use is made
of fillers, such as chalk. The synthetic material applied therein preferably comprises
recycled synthetic material or substantially consists thereof. Preferably, the back
layer is realized with a higher density than the wear layer. Amongst others, for this
the application of filler materials in the back layer is of interest. For the motif
or pattern, use can be made of a printed material sheet, such as a synthetic material
film, or of a print performed directly on the substrate. For said translucent or transparent
wear layer, preferably use is made of a vinyl layer or polyurethane layer having a
thickness of at least 0.2 millimeters and still better having a thickness of at least
0.3 millimeters. Preferably, this translucent or transparent layer is not made thicker
than 1 millimeter. By means of a transparent layer of 0.25 to 0.7 millimeters, a wear
resistance can be obtained which is comparable to that of laminate floor panels. The
transparent or translucent layer can either be provided as a film, whether or not
together with said printed film, or provided in liquid form and afterwards hardened
on the substrate. Preferably, the transparent or translucent layer has a thickness
corresponding to at least 25 percent of the overall thickness of the top layer. Preferably,
said transparent or translucent top layer is free from hard mineral particles, such
as aluminum oxide particles. According to the inventors, this is not necessary when
the transparent layer has a thickness of at least 0.2 millimeters. With such thickness
in fact already a wear resistance can be obtained of IP 2000 according to the standard
for laminate floorings EN 13329. When with similar thicknesses, a higher wear resistance
has to be obtained, preferably indeed use is made of hard particles.
[0092] Generally, when using thin transparent thermoplastic layers, namely, layers thinner
than 0.5 millimeters or thinner than 0.35 millimeters, preferably indeed use is made
of hard mineral particles, such as aluminum oxide, in the respective layer.
[0093] Optionally, the top layer can include a surface layer on the basis of a radiation-hardened
translucent or transparent synthetic material layer, for example, on the basis of
a UV-hardening substance. Such surface layer possibly may include hard mineral particles,
such as aluminum oxide particles.
[0094] Preferably, the parts 18 and 20 are configured such, for example, made so low, that
the panels at the edges 8-9 can engaged into each other not only by said downward
movement, but also can be engaged into each other and/or turned out of each other
at least by a turning movement. Whether or not in combination therewith, the profiles
at the edges 8-9 also can be configured such that two of such panels can be engaged
into each other by means of a shifting and snap movement. This, too, can be in combination
with any one of the aforementioned aspects of the invention.
[0095] Further, it is also clear that in all coupling parts which are applied in panels
according to the invention, a so-called pretension can be incorporated, by which the
panels in coupled condition are tensioned towards each other and adjoin well against
each other. The basic principle of pretension as such is known from
WO 97/47834.
[0096] Further, it is clear that the flexible part 31 can be configured such that the part
18, in coupled condition, is pressed with its contact surfaces 29 with a permanent
force onto the contact surfaces 30.
[0097] For clarity's sake, it is noted that, when it is stated that the flexible part is
bendable "in the plane of the panel", a bending will occur seen in a theoretical plane
of section parallel to the plane of the panel. This does not necessarily mean that
the flexible part as such is movable in horizontal direction. In the embodiment of
figure 5, the flexible part in fact performs a tilting and bending movement and thus
substantially is not displaced horizontally, but rotates.
[0098] By a "downward movement", it is meant that in a cross-section as in figures 4 to
6, the one panel in respect to the other moves with the hook-shaped parts with their
open sides towards each other. This can be in a substantially plane-parallel manner,
however, and in accordance with the invention, also as a result of applying the aforementioned
"angle-push" technique. Also, it is noted that the downward movement can or cannot
take place with a minimal displacement in transverse direction, thus, horizontally
in figure 5, as a result of mutual lateral contacts.
[0099] Although otherwise represented in the figures, it is not excluded that the underlying
layer 46 may extend to below the synthetic edge parts 10A. In the figures, it is further
also represented that, according to these examples, the synthetic edge part 10A extends
at least over the entire thickness of the core material. Hereby, by means of the synthetic
edge part a waterproof protection of the core 10 is obtained. The entire contour of
the respective coupling parts 14 is performed in the material of this edge part 10A.
[0100] Figure 17 further also shows that a synthetic edge part 10B can also be provided
on the opposite edge 4. In this case, an edge part 10B is applied, wherein the connection
between the edge part 10B and the core material 10 is over a boundary surface having
partial surfaces 48, which extend transverse to the normal of the surface of the panel
1.
[0101] Figures 18 to 20 represent an embodiment in accordance with the present invention,
namely, wherein said coupling parts 13-14 for providing said locking in the plane
of the panels 1 and perpendicular to said edges 8-9 are provided with locking parts
in the form of hook-shaped parts 15-16, which, in the coupled condition, show contact
surfaces 21-22 engaging behind each other, with the particular characteristic that
these contact surfaces 21-22, seen in this top plan view of the panel 1, globally
extend in a direction different from the direction of said upper edges 48.
[0102] It is evident that the particular characteristic illustrated by means of figures
18 to 20 can also be applied broader than only with panels shown. To wit, this relates
to an illustration of the invention, which, as mentioned in claim 1, has to be understood
as relating to a panel, more particularly a floor panel, wherein this panel 1 comprises
a core 10, an upper side 11, a lower side 12 and at least two opposite edges 8-9,
wherein the panel at said edges 8-9 comprises pertaining upper edges; wherein at said
two opposite edges 8-9, coupling parts 13-14 are provided; wherein these coupling
parts 13-14 have such a configuration that the coupling parts of two of such panels
1 can be brought into each other by means of a downward movement of one of the panels
1 in respect to the other, wherein, in the coupled condition of the panels 1, a locking
can be obtained in the plane of the panels 1 and perpendicular to said edges 8-9,
as well as perpendicular to the plane of the panels 1, wherein said coupling parts
13 for providing said locking in the plane of the panels 1 and perpendicular to said
edges 8-9 are provided with locking parts in the form of hook-shaped parts 15-16,
which, in the coupled condition, show contact surfaces 21-22 engaging behind each
other, wherein these contact surfaces 21-22, seen in a top plan view of the panel
1, globally extend in one or more directions different from the direction of said
upper edges. This particularity can lead to an improved tensioning among the panels
1, whereas the panels 1 possibly still can be detached in a smooth manner. This is
of particular importance with coupling parts or coupling means which can be engaged
in each other by means of a downward movement. To wit, the systems of the state of
the art often are provided with a certain play in the direction of the plane and perpendicular
to the coupled edges, such that they can be brought into each other in a smooth manner.
Hereby, gaps in the floor surface may occur. The deviating direction of the contact
surfaces 21-22, which is applied according to the present invention, can result in
a more accurate coupling, for example, without play, whereas the coupling parts still
can be brought into each other in a smooth manner. The invention further has the advantage
that, compared with existing downward-coupling systems, can be marketed in a more
economic manner.
[0103] According to preferred embodiments of the invention, said hook-shaped parts 15-16,
on the one hand, comprise an upper hook-shaped part 15 with a flange 17 laterally
protruding near the upper side of the panel 1, which flange is provided with a downward-directed
part 18, and, on the other hand, a lower hook-shaped part 16 with a flange 19 laterally
protruding near the lower side of the panel 1, which flange is provided with an upward-directed
part 20, wherein said contact surfaces 21-22 are formed between said downward-directed
part 18 and said upward-directed part 20. Figures 18 to 20 illustrate such embodiment.
Preferably, said contact surfaces 21-22, such as here, seen in a cross-section perpendicular
to the respective edge, extend vertically or extend inclined or bent from the top
to the bottom in the direction of the edge provided with the lower hook-shaped part
16.
[0104] The coupling parts 13-14, according to the invention, comprise locking parts 25-26
on said two edges 8-9, which locking parts ensure said locking in the direction perpendicular
to the plane of the panels 1, wherein these locking parts 25-26 comprise respective
contact surfaces 27-28. Preferably, these locking parts 25-26, just as in the present
examples, are substantially formed as a tongue or tongue-shaped part 25 and a groove
51 bordered by a lower lip 49 and an upper lip 50. In the case of figures 18 to 20,
the lower lip 49 is determined by the lower hook-shaped part 16, whereas the upper
lip 50 for the major part is determined by the locking part 26.
[0105] As in the preceding case, said contact surfaces 27-28 preferably are situated on
the upper side of said tongue or tongue-shaped part 25 and on the lower side of said
upper lip 50.
[0106] Said contact surfaces 27-28 provided on the locking parts 25-26, which provide for
said locking in the direction perpendicular to the plane of the panels 1, preferably,
as is also the case in the examples, extend substantially parallel to the upper side
of the panels.
[0107] Preferably, said contact surfaces 21-22, seen in a top plan view of the panel 1,
globally extend in a direction forming an angle A with the upper edges 48, wherein
this angle A is situated between 0.5° and 5°, and still better between 1° and 2°.
[0108] Preferably, said contact surfaces 21-22, seen in a top plan view of the panel 1,
as is the case here, globally extend on a straight line forming an angle A with the
upper edge 48 of the panels 1.
[0109] The panels 1 of the invention further are characterized in that the panels 1, on
the other pair of opposite sides 6-7, also are provided with coupling means 39-40
allowing to couple two of such panels 1 on these edges by engaging the respective
coupling means 39-40 in each other, wherein these coupling means 39-40 comprise a
female coupling part and a male coupling part, and during coupling the male coupling
part has to be provided in the female coupling part. For example, this may relate
to a male coupling part 39 and a female coupling part 40, which respectively are substantially
realized as a tongue and a groove, as this is the case with the coupling means of
figure 12. In accordance with the invention, these coupling means 39-40 allow that
two of such panels 1 can be engaged in each other at least by means of a turning movement
W.
[0110] As illustrated by the example of figure 18, the panels preferably also have the further
characteristic that said contact surfaces 21-22, seen in a top plan view of the panel
1, globally extend from said male coupling part 39 to the female coupling part 40
in a direction away from the edge 5 which is provided with the lower hook-shaped part
16. Preferably, the distance between said contact surfaces 21-22 and the respective
upper edge 48 is increasing. These embodiments allow a smooth uncoupling of the coupled
panels 1. Uncoupling the panels can be performed by turning the panel 1 upward, along
the coupled long edge 6, which is provided with the male coupling part 39, in combination
with a limited displacement of the panels 1 along the edges 4-5 and away from the
coupled long edge 6. Of course, it is not excluded that said contact surfaces 21-22,
seen in a top plan view of the panel 1, globally extend from said male coupling part
39 to the female coupling part 40 in a direction towards the edge 5, which is provided
with the lower hook-shaped part 16. Preferably, the distance between said contact
surfaces 21-22 and the respective upper edge 48 in such case is getting smaller. Such
embodiment also allows smooth uncoupling. In this case, uncoupling, according to a
first possibility, can be performed by turning up one or more panels 1 in a row at
the same time in order to detach these panels 1 at the long edges 6 provided with
the male coupling part 39, from an adjacent row and afterwards displacing the panels
along the edges 4-5 and towards the coupled long edge 6. According to a second possibility,
detaching can be performed by turning up the panel 1 along the coupled long edge 7,
which is provided with the female coupling part, in combination with a limited displacement
of the panels 1 along the edges 4-5 and away from the coupled long edge 7 which is
provided with the female coupling part. Of course, other assembling or disassembling
techniques are not excluded. In general, it can be said that the panels 1 preferably
can be uncoupled by turning up on a long edge in combination with the displacement
on a short edge in the direction of the increasing distance between the contact surfaces
21-22 and the upper edges 48.
[0111] It is clear that the present invention can be applied with panels 1 which, as in
the examples of figures 18 to 20, show, on at least one of said opposite edges 8-9,
a synthetic edge part 10A, of a material different from the core material, wherein
the coupling parts 13-14 at said two edges 8-9 comprise locking parts 25-26 ensuring
said locking in the direction perpendicular to the plane of the panels 1, wherein
at least one of these locking parts 26 forms part of a flexible part 31 realized in
one piece with said synthetic edge part, which flexible part extends along the respective
edge and is bendable at least in the plane of the panel, as the consequence of joining
two of such panels 1. According to an alternative, the core material extends up to
the respective edge with the locking part 26, and possibly the edge itself is free
from synthetic edge portions of another material, wherein the respective locking part
26 then forms part of a flexible part formed in one piece with the core material.
Herein, then also possible support parts and other locking parts at the respective
edges preferably are realized in one piece in the core material, wherein preferably
for the core material use is made of a board-shaped substrate of a wood composite,
such as MDF or HDF. Preferably, said flexible part 31 is realized as a lip 26, whereas
another locking part 25, which is intended for cooperating therewith, is realized
as a tongue-shaped part 25, which, during joining of two of such panels 1, causes
an elastic bending in the lip 26, such that this tongue-shaped part 25 can become
engaged behind the lip 26 by means of a snap movement. In particular, the coupling
means from PCT/IB2010/052812 can be applied.
[0112] Figure 21 represents another example of the invention, wherein the floor panel 1
at the short pair of edges 4-5 is provided with coupling means 13-14 which allow a
coupling by means of a downward movement N of the coupling means at the one edge 4
in the coupling means at the other edge 5. Herein, the coupling means 13-14 are realized
with locking parts 25-26, which substantially are formed as a tongue or tongue-shaped
part 26 and a groove 51 bordered by a lower lip 49 and an upper lip 50. Herein, the
lower lip 49 is determined by the lower hook-shaped part 16, whereas the upper lip
50 is determined by an undercut provided on the edge 5 which is provided with the
lower hook-shaped part 16. The tongue-shaped part can be provided in the groove 51
by means of said downward movement N. Said tongue-shaped part 25 is made movable and
cooperates with said groove 51 in order to provide for a locking in the direction
perpendicular to the plane of the coupled panels 1. In this case, the movable tongue-shaped
part 25 is situated on the upper hook-shaped part 15, and said groove 51 is provided
on the lower hook-shaped part 16. However, it is not excluded that this may be realized
vice versa. In this case, the movability of the tongue part 25 is at least partially
obtained by means of a free space 52 provided behind the tongue part 25, by which
this tongue part 25, with coupling in proximal direction, can be moved in respect
to the edge 4 on which it is situated. After the end of the coupling movement N, the
tongue part 25 enters said groove 51. Instead of working with a tongue part 25 which
automatically ends up in said groove 51 when performing the coupling movement N, also
a tongue part 25 can be used which still requires a separate operation for obtaining
an effective locking in the direction perpendicular to the plane of the coupled panels
1. For example, it is possible that such tongue part 25, after performing the downward
movement N, still has to be displaced in a direction parallel to the edges 4-5 to
be coupled. This can be performed, for example, by the installing person, or by the
intermediary of a panel 1 still to be installed, for example, in a subsequent row.
Such coupling means 13-14 are known as such, for example, from
WO 2009/116926.
[0113] It is noted that according to the invention, preferably coupling means 13-14 are
used which are made in one piece in the substrate material 10 and/or the material
of a possible synthetic edge part 10A-10B. However, it is not excluded that separate
material parts may be used which form part of the coupling means. For example, in
the case of coupling means which allow a coupling by means of a downward movement,
use can be made of a tongue part 25 consisting of one or more plastic strips 53, which
are provided in a recess provided for this purpose. An example thereof is illustrated
by means of figure 22. In the example of figure 22, the strip 53 provides for the
snap effect which provides for the automatic locking of the floor panels in the direction
perpendicular to the plane of the coupled panels 1.
[0114] Where in the above description a downward coupling movement is mentioned, this preferably
relates to a coupling movement obtained by means of a turning movement W along the
long pair of edges 6-7. As mentioned, it is not excluded that the downward coupling
movement still has to be completed by means of a separate operation for realizing
an effective locking in the direction perpendicular to the plane of the coupled panels
1. It is noted that the invention preferably is applied for coupling means which,
when the floor panels are coupled to each other with a downward movement, automatically
result in a locking in the plane of the panels 1 and perpendicular to said edges 8-9
as well as perpendicular to the plane of the panels 1. For example, use can be made
of coupling means which, during joining, provide for a snap effect. Namely, the deviating
direction of the contact surfaces 21-22 can lead to a more gradual snap effect of
the locking parts during the downward joining movement or coupling movement. However,
the invention can also be applied with coupling means which, after being joined, require
a separate operation for obtaining the final locking in the direction perpendicular
to the plane of the panels 1.
[0115] Figure 23 shows another example of coupled floor panels 1 with the characteristics
of the invention. To this aim, the panels 1, for providing the locking in a direction
R1 in the plane of the panels 1 and perpendicularly to the respective edges 4-5, in
this case the short edges 4-5 of an oblong floor panel 1, are provided with hook-shaped
parts 15-16, which in the coupled condition represented here show contact surfaces
21-22 which engage one behind the other.
[0116] Figure 24 clearly shows that the contact surfaces 21-22 extend in one or more directions
differing from the direction of the upper edges. This is also clear from figures 25
and 26, which respectively offer a top view on the lower hook-shaped part 16 and a
bottom view on the upper hook-shaped part 16.
[0117] Said upper hook-shaped part 15 comprises a flange 17 laterally protruding near the
upper side of the panel 1, which flange is provided with a downward-directed part
18. Said lower hook-shaped part 16 comprises a flange 19 laterally protruding near
the lower side of the panel 1, which flange is provided with an upward-directed part
20. Said contact surfaces 21-22 are formed between said downward-directed part 18
and said upward-directed part 20. The respective contact surface 22 formed on the
upward-directed part 20 is oriented towards the pertaining upper edge. Viewed in the
cross-section of figures 23 and 24, the contact surfaces 21-22 extend inclined from
the top downward in the direction of the edge provided with the lower hook-shaped
part 16. In this case, an angle L situated between 35 and 80° is applied. Preferably,
the angle L is at least 45° or 50°. Independent from the direction or directions in
which the contact surfaces 21-22 extend along the edges 4-5, the inclination, or the
angle L, preferably remains constant. If the inclination, or the angle L, varies along
the edges 4-5, preferably it will still remain situated between 35 and 80° at each
point along the edges 4-5.
[0118] The coupling parts or hook-shaped parts 15-16 further also comprise locking parts
25-26, which ensure said locking in a direction R1, perpendicularly to the plane of
the coupled panels 1. These locking parts 25-26-25A-26A also show cooperating contact
surfaces 27-28-27A-28A, which resist the release of the upper hook-shaped part 15
from the lower hook-shaped part 16 in said direction R1. In the example, the contact
surfaces 27-28-27A-28A extend in a flat manner, however, respectively at an angle
with the surface of the panels 1, for example, such as here, at an angle of 45° or
less.
[0119] In the examples of the figures 23 through 26, the locking parts 25-26-25A-26A and
contact surfaces 27-28-27A-28A are made double. The first pair of locking parts 25-26
is substantially formed as a tongue 25 and a groove 51 bordered by a lower lip 49
and upper lip 50. The pertaining contact surfaces 27-28 are situated on the upper
side of the tongue 25 and on the lower side of said upper lip 50 and in this case
extend flat at an angle of 45°, or approximately 45°, with the surface of the panels
1. The second pair of locking parts 25A-26A and contact surfaces 27A-28A substantially
is formed as a lateral protrusion 54, namely protruding in the direction R2, at the
lower side of the edge 4 with the upper hook-shaped part 15, and an undercut 55 on
the lower side of the lower hook-shaped part 16, wherein the protrusion 54 and the
undercut 55 cooperate with each other and form contact surfaces 27A-28A active in
said direction R1. The respective contact surfaces 27A-28A are formed more particularly
on the upper side of the protrusion 54 and on the lower side of the lower hook-shaped
part 16, at the location of the recess 55. The respective contact surfaces 27A-28A
extend flat at an angle of 15° or approximately 15° to the surface of the panels 1.
[0120] Although in the present example the locking parts 25-26-25A-26A and the pertaining
contact surfaces 27-28-27A-28A are made double, it is not excluded that one would
work with only one pair of these locking parts and contact surfaces, either with said
first pair or with said second pair.
[0121] In the example of figures 23 through 26, also vertically active contact surfaces
56-57 are provided, which restrict the movement of the upper hook-shaped part 15 towards
the lower hook-shaped part 16. In the example, these contact surfaces 56-57 respectively
are situated on the lower side of the upper hook-shaped part 15 and on the upper side
of the upward-directed part 20 of the lower hook-shaped part 16. Such contact surfaces
56-57, which restrict the movement of the upper hook-shaped part 15 towards the lower
hook-shaped part 16, in general are of interest for minimizing the risk of the occurrence
of height differences between the coupled upper edges when the floor covering is walked
on and may be applied in any embodiment of the invention.
[0122] Further, in the example of figures 23 through 26, in coupled condition of two floor
panels, a space 58 is provided between the lower side of the upper hook-shaped part
15 and the upper side of the lower hook-shaped part 16, wherein this space 58 extends
at least vertically underneath the coupled upper edges. Such space 58 in general is
of interest for minimizing the risk of the occurrence of height differences between
the coupled upper edges and may be applied in any embodiment of said first aspect
and/or said second aspect of the invention. Preferably, the space 58 extends over
at least a third of the recess 59 or over at least the major part of the recess 59,
or, such as here, over the entire recess 59 adjacent to the upward-directed part 20
of the lower hook-shaped part 16, namely at least from vertically underneath the coupled
upper edges up to the contact surfaces 21-22 active for the locking in the horizontal
direction R2. On the distal end of the upward-directed part 20, further also a space
58A is provided. In this case, contacts between this distal end and the upper hook-shaped
part 15 and/or lateral protrusion 54, with the exception of the contact surfaces 27A-28A,
are avoided, such that a good connection with the upper edges 48 can be obtained.
[0123] Figures 23 through 26 further also show that for the lateral protrusion 54, use is
made of a movably provided part of the panel 1, similar to the tongue-shaped part
25 from figure 21. Instead of working with a groove, the movably realized lateral
protrusion 54 here, as aforementioned, works in conjunction with the undercut 55.
The movability of the lateral protrusion 54 in this case is obtained at least partially
in that a flexible material 59 is applied in an initially free space 52 behind the
lateral protrusion, whereby this protrusion 54, during coupling, can be moved in proximal
direction in respect to the edge 4 on which it is located. Towards the end of the
coupling movement N, the lateral protrusion 54 enters the undercut 55. Instead of
working with a protrusion 54 which automatically enters the undercut 55, here, too,
one may work with a lateral protrusion which still requires a separate operation for
obtaining an effective locking in the direction perpendicular to the plane of the
coupled panels 1. It is also noted that for the flexible material 59, use can be made
of the materials mentioned in
WO 2010/142671, for example, of a material chosen from the series of silicone, acrylate, hot-melt
glue, whether or not foamed, for example, on the basis of polyurethane. Further, it
is noted that such flexible material 59 can also be applied in the free space 52 of
the example of figure 21, or in any other coupling where movability of a locking part
is obtained by means of a free space, for example, in the embodiments of the second
aspect, in the cut 32. Further, it is clear that the flexible material 59 in the examples
of the figures 23 through 26 has to be considered as purely optional and that, for
example, also an effectively free space 52 might be employed.
[0124] Further, it is also noted that the hook-shaped parts 15-16 including the locking
parts 25-26-25A-26A and contact surfaces 27-28-27A-28A are made in one piece with
the panel 1, for example, in one piece with the core 10 of such panel 1. However,
it is not excluded that one or more of these parts and/or surfaces might be formed
on a separate edge part fixedly connected to the panel and/or on a separate strip
connected to the panel in a removable manner. For example, the lateral protrusion
54 from figures 23 through 26 can be made by means of a springy, or arranged in a
springy manner, plastic strip, similar to the plastic strip 53 of figure 22.
[0125] Figure 27 again clearly shows the configuration of the contact surface 22, according
to the most preferred embodiment of the invention. Herein, the contact surface 22
extends at an angle A with the upper edge 48, wherein this angle A is situated between
0.5 and 5°, in the example, approximately 3° has been chosen for this angle A. Viewed
in the top view of this example, the contact surfaces extend continuously according
to a straight line over an operative distance D of more than 50% or here of even more
than 75% of the width B of the decorative side of the panel 1. Also in the case of
not-continuous contact surfaces and/or of not straight and thus curved contact surfaces,
the overall operative distance D of the contact surfaces preferably is maintained.
By "operative distance D" is meant that in a coupled condition of two panels 1 effectively
a contact is created over this distance D.
[0126] In the example of figure 27 and in accordance with the invention, the panel 1 at
the other pair of opposite sides 2-3 is also provided with profiled edges 6-7 with
a male coupling part 39 and a female coupling part 40. Preferably, this relates to
coupling parts 39-40 similar to those described by means of figure 12, whereby, in
accordance with the invention, they allow connecting two panels 1 at the respective
sides 2-3 with each other by means of a turning movement W. It is clear that herein
not necessarily a covering layer 47 has to be applied. The contact surface 21 herein
extends such that the distance between the upper edge 48 and the contact surface 22,
viewed in the direction of the male coupling part 39 towards the female coupling part
40, always increases.
[0127] Although in the preceding figures always represented as straight and continuous,
it is not excluded that the contact surfaces 21-22, according to the invention, are
realized curved and/or discontinuous.
[0128] Figure 28 represents an example of contact surfaces which are interrupted and wherein
the actual contact surface 22 consists of two parts, which both extend in the same
direction, however, different to the pertaining upper edge 48. Of course, it is not
excluded that the parts might extend in a mutually different direction. In this case,
the distance D1 between the upper edge 48 and the contact surface 22 increases for
both parts thereof in the same direction. Preferably, the contact surfaces 21-22 of
both parts together, in case of an interruption thereof, such as here, extend over
an overall operative distance D of more than 30% or here even of more than 50%, or
almost 60% of the width B of the decorative side of the panel 1. Also in the case
that there should be more than two parts, the common operative distance D of all of
these parts preferably is more than 30% or more than 50% of the width B of the decorative
side of the panel 1.
[0129] Figure 29 represents an example of contact surfaces 22 which are interrupted and
wherein both parts of the actual contact surface 22 extend in a curved manner along
the pertaining upper edge 48. Here, too, the distance D1 between the upper edge 48
and the contact surface 22 each time increases or possibly locally remains the same.
In this case, a continuous, however, not constant curvature is applied. Here, too,
the common operative distance D over which the contact surfaces 22 extend is more
than 30% or even more than 50% of the width B of the decorative side of the panels
1. In dashed line 60, another variant is represented, wherein one of the parts of
the contact surfaces 22 extends such that the distance D1 between the contact surface
22 and the upper edge 48 increases in reverse direction along the upper edge 48 in
comparison to the other part. In this manner, for example, a centering effect can
be obtained of the long sides 2-3 of two coupled panels 1.
[0130] It is evident that in the examples of figures 27 to 29 preferably corresponding contact
surfaces 21 are applied, to wit with substantially coinciding interruptions and/or
directions and/or parts.
[0131] When an interruption of the contact surface in different parts is mentioned, this
respectively relates to an interruption of the contact itself in a coupled condition
of two of such panels, and not necessarily to an interruption of the part of the coupling
parts on which such contact surface is provided.
[0132] Figure 28 in dashed line represents another embodiment where plastic strips 53 are
applied, for example, similar to those represented and/or described in connection
with figure 22. Of course, such strip 53 can be applied in any embodiment of the invention,
preferably for realizing contact surfaces 27-28 which are operative in vertical direction
R1, perpendicularly to the plane of the coupled panels 1. Such strip 53 preferably
leads to the creation of a snap effect when performing the coupling movement N. Preferably,
by means of such strip 53 and/or snap effect, an automatic locking is obtained in
the direction perpendicularly to the plane of the coupled panels 1. A particularity
of the embodiment of figure 28 is that along the respective edge 5 a plurality of
such strips 53 are used, in this case two strips 53. In this case, the position of
the strips 53 corresponds to the parts of the contact surface 21. By working with
more than one strip, a more gradual coupling can be obtained, which can be provided
in each other with less force exertion by means of a downward coupling movement N
of the panels towards each other. However, it is not excluded that one or more strips
53 might be applied, whereby the position thereof corresponds to one or more interruptions
in the contact surface 21, or only one strip 53, which then preferably extends over
at least 50 percent of the width B of the decorative side.
[0133] It is clear that the core materials, synthetic edge parts and materials therefor,
top layers and backing layers mentioned in the introduction can be applied in the
invention.
[0134] It is also noted that in the above description and the following claims, a number
of terms, such as "downward", "lower", "upper", "lower side" and "upper side", are
related to floor panels and that it is clear that for other panels, which are not
lying substantially flat, these terms have to be interpreted similarly, however, then
relative to the plane of the panels.
[0135] The present invention is in no way limited to the embodiments described by way of
example and represented in the figures; on the contrary, such panels may be realized
in various forms and dimensions without leaving the scope of the present invention,
as defined by the appended claims. So, for example, the invention is not limited to
floor panels and can be employed in any other field of application, such as, amongst
others, in wall panels, ceiling panels, furniture panels and so on.