[0001] The invention relates to a sanding device for a sanding machine, comprising a carrier,
a sanding element and at least two coupling elements with which the sanding element
is coupled to the carrier, wherein a movable connection is provided between the sanding
element and the carrier.
[0002] Such a sanding device is known from
WO 96/34721. In this known sanding device a sanding element is connected via two pivot arms to
a carrier which is releasably connected to the sanding sole of a sanding machine.
The sanding element consists of a flexible support plate with pads to which a piece
of sandpaper is fixed. On one side the pivot arms are mounted pivotally on the support
plate and on the other arranged slidably in slotted holes in the carrier. The ends
of the pivot arms can be fixed in the slotted holes via nuts. For sanding purposes
the curvature of the support plate is adjusted as desired by sliding the pivot arm
ends in the slotted holes and fixed in place by tightening the nuts. The sanding element
thus has a fixed position during sanding.
[0003] A drawback of this known sanding device is that it is a relatively complex construction,
while the degree of flexibility is very limited, particularly during sanding of surfaces
with a radius of curvature.
[0004] The present invention has for its object to provide such a sanding device, the construction
of which is simpler and more suitable for sanding surfaces with different radii of
curvature.
[0005] This object is achieved by a sanding device according to claim 1.
[0006] The coupling elements only support the sanding element at the ends. In the centre
of the sanding element the sanding element is not supported, so that it is sufficiently
flexible. Because these ends of the coupling elements can move relative to each other,
the radius of curvature on the surface for sanding can be adjusted during sanding.
[0007] The coupling elements can themselves be flexible here in order to provide the desired
movement. It is however also possible for the coupling elements to be hingedly connected
to the carrier. Both variants can also be combined.
[0008] According to one embodiment, the device comprises means for urging the coupling elements
apart at least at the position of the sanding element. An additional tensioning force
is hereby generated in the sanding element, whereby the normal force to be exerted
by the sanding element, and thereby the sanding force, is greater.
[0009] Since it is expected that in practice such a sanding device will usually be used
to sand round surfaces such as pipes, it is attractive when the sanding surface can
curve in accordance with a cylinder, this being facilitated by the measure that the
sanding element is connected to two coupling elements and that the connecting lines
between the coupling elements on the one hand and the sanding element on the other
extend substantially parallel.
[0010] Another embodiment provides the measure that the sanding element comprises a flexible
supporting element connected fixedly to the coupling elements, for the purpose of
supporting a sheet of sandpaper for connecting thereto. The supporting element connected
fixedly to the coupling elements is for instance formed by a piece of fabric or other
flexible material, which is preferably provided with Velcro material for attaching
a sheet of sandpaper or sand cloth thereto. This sandpaper or sand cloth must then
of course be provided with mating Velcro material. It is otherwise also possible to
make use of a supporting element into which the Velcro material is already integrated.
[0011] A specific embodiment provides the measure that the coupling elements are connected
to a base, and that the base is releasably connected to the carrier.
[0012] Another embodiment provides the measure that the sanding element has the form of
a closed sanding belt which extends around the combination of coupling elements and
base. It hereby becomes possible to make use of annular belts of sanding material,
wherein these can be mounted with a simple operation. The use of a support for the
sandpaper or sand cloth between the coupling elements is unnecessary here. Replacement
of the sandpaper is moreover easier.
[0013] According to a further aspect of the invention, the base is connected releasably
and rotatably to the carrier in order to facilitate sanding. In addition to rotation
of the sanding element, this measure provides the option of exchanging the sanding
element, together with the base and the coupling elements, for a similar combination
with a different configuration or shape. Other processing elements can moreover be
placed, such as a rigid sanding element or an element adapted to carry out a process
other than sanding.
[0014] In addition, the base can be releasable in at least one angular position of the carrier.
Use is for instance made here of a configuration of a bayonet fitting, wherein the
fitting is in the locked position in an active position of the sanding element.
[0015] Other attractive preferred embodiments are stated in the remaining claims.
[0016] The invention further relates to a sanding machine comprising a sanding sole and
a sanding device, wherein the carrier of the sanding device can be formed by the sanding
sole of the sanding machine or the sanding device can be releasably connected to the
sanding sole of the sanding machine.
[0017] The present invention will be elucidated hereinbelow with reference to the annexed
drawings, in which:
Figure 1 is a schematic perspective view of a first embodiment of a sanding machine
according to the invention;
Figure 2 is a detail view with exploded parts of a part of the sanding machine shown
in figure 1;
Figure 3 is a schematic perspective view of a second embodiment of the sanding machine;
Figure 4 is a detail view with exploded parts of a part of the sanding machine shown
in figure 3;
Figure 5 is a schematic perspective view of a further embodiment of a sanding device
according to the invention;
Figure 6 is a schematic perspective view of a further embodiment of a sanding device
according to the invention;
Figure 7 is a schematic perspective view of a final embodiment of a sanding device
according to the invention, wherein a part is removed;
Figure 8 is a view corresponding with figure 7, with all parts shown;
Figure 9 is a side view of the releasable part of the sanding device shown in figures
7 and 8;
Figure 10 is a perspective top view of the releasable part of the sanding device shown
in figures 7 and 8; and
Figures 11A-G show different variants of sanding elements which are connected releasably
and rotatably to a carrier.
[0018] Figure 1 shows a sanding machine designated as a whole with 1, which is provided
with a sanding sole 2. In the manner of a prior art sanding machine, this sanding
sole 2 can be provided with a piece of sandpaper or sand cloth for performing a surface
sanding operation. Sanding machine 1 is herein adapted to drive sanding sole 2 such
that it executes a reciprocal movement. This can be a movement back and forth but
may also be a rotating movement, or a combination of both types of movement.
[0019] A carrier 3 is fixed onto sanding sole 2. This carrier 3 is connected to sanding
sole 2 for instance by means of a snap connection or as according to the method described
in
EP-A-1166963.
[0020] In addition to carrier 3, the sanding device for sanding machine 1 shown in figures
1 and 2 comprises a sanding element 9, 10 and two coupling elements 8 with which sanding
element 9, 10 is coupled to carrier 3.
[0021] Carrier 3 is provided with two hinge constructions 4 extending in parallel as shown
in figure 2. Each of these hinge constructions 4 is formed by a retaining element
5, which is formed integrally with carrier 3 and a shaft 6. Shaft 6 is provided with
protruding end parts 7 which can be received by means of a snap connection in recesses
29 arranged in retaining elements 5. Hinges 6 are formed integrally with coupling
elements 8.
[0022] The two coupling elements 8 are coupled to a sandpaper supporting element 9 manufactured
from flexible material. This sandpaper supporting element 9 is connected for this
purpose to coupling elements 8 by means of for instance glueing or another type of
connection. On its outside the sandpaper supporting element 9 is provided with Velcro
material. Sandpaper 10 can be arranged on the sandpaper supporting element 9 by means
of a Velcro connection.
[0023] As can be seen in figure 1, it is possible to sand a curved surface, for instance
a pipe 11, using the thus formed sanding device.
[0024] The majority of the workpieces to be sanded by such a sanding machine 1 have a cylindrical
surface. It is therefore attractive, as in the above elucidated embodiment, for hinges
4 to extend parallel to each other. Sanding element 9, 10 will take on the form of
the sanding surface as a result of the movable connection between sanding element
9, 10 and carrier 3, in that the ends of coupling elements 8 coupled to sanding element
9, 10 can move relative to each other. The flexibility of supporting element 9 and
sanding machine 10 also contribute hereto.
[0025] Although this will occur less frequently in practice, it is in principle also possible
to sand non-cylindrical objects with such a sanding device. It is possible to consider
having the hinges 6 extend at a certain angle for this purpose.
[0026] Figures 3 and 4 show another embodiment of the invention, which relates principally
to the manner in which the sandpaper is attached.
[0027] In the embodiment shown in figures 3 and 4 use is made of an annular piece of sandpaper
12 which is placed round a combination 13. This combination 13 is formed by a base
14 to which two coupling elements 16 are connected by means of hinges 15. The dimensions
of the annular piece of sandpaper 12 and combination 13 are such that, in the situation
shown in figure 4, sandpaper 12 is as flat as possible at the position of the sanding
surface. In this situation the combination 13 with sandpaper 12 arranged thereon is
pushed into a clip 17 arranged on carrier 3. Clip 17 fixedly clamps the combination
with the sandpaper 12 arranged therearound.
[0028] As a result of the fact that combination 13 is integrally formed, coupling elements
16 will have a preferred position. They will be urged into this preferred position.
A stretching force is hereby exerted on the part of sanding belt 12 adapted for the
sanding operation. In the foregoing embodiment there is no such preferred position.
This can of course be arranged as desired. The relevant means can be provided for
this purpose.
[0029] An advantage of the embodiment shown in figure 4 is that sandpaper 12 can be used
more completely. After the uppermost piece of sandpaper 12 has been used, the annular
sandpaper 12 can be rotated and a subsequent piece of sandpaper 12 can be used.
[0030] The embodiment shown in figure 5 comprises a carrier 3 in the form of a sanding sole
for releasable connection to a sanding machine, on which sole a base 14 is rotatably
mounted. On base 14 are arranged two coupling elements 16 which are manufactured from
flexible material. At least the distal ends of these coupling elements 16 are connected
to a sanding element (not shown). In this embodiment the coupling elements 16 and
base 14 are embodied integrally.
[0031] Base 14 is provided with a shaft which is not shown in the drawing and which extends
into carrier 3 perpendicularly of carrier 3. Base 14 is provided with a nose which
is not shown in the drawing and which engages under a substantially L-shaped edge
18 fixed to carrier 3. This edge 18 extends in a circular arc.
[0032] Base 14 is secured on carrier 3 in that the nose protrudes below L-shaped edge 18.
Base 14 can be removed by rotating the nose from under edge 18. Base 14 can be locked
on carrier 3 in diverse angular positions by per se known locking means, such as an
elevation 25 as shown in figure 5 in co-action with a corresponding recess in the
bottom of base 14. The action of a bayonet fitting is obtained here.
[0033] Rapid exchange of the base 14 with the sanding element arranged thereon is thus possible,
wherein a good connection to base 14 is obtained despite this advantage, this being
important in respect of the transfer of forces during sanding. This fastening otherwise
provides the option of rapid replacement of base 14 by a base on which is placed a
sanding element with a different configuration. As well as a flexible sanding element,
it is thus possible for instance to apply a substantially rigid sanding element with
a form adapted to the operation to be performed, such as a concave, convex, folded
form or with a sharp point.
[0034] The advantages obtained with the above discussed embodiment can however also be obtained
with the embodiment according to figure 6.
[0035] In the embodiment of figure 6 the reference numeral 3 designates the sanding sole
of the sanding machine (not further shown) since this fulfills the function of carrier
3. A clamping element 20 is connected rotatably to sanding sole 3. Clamping element
20 is mounted for this purpose on carrier 3 by means of a shaft 21. The clamping element
is provided with a U-shaped end part 22 and a pair of ridges 23. Ridges 23 continue
as side walls 27 and 28, of which the wall 28 is shown broken-away in figure 6.
[0036] A base 14, on which a sanding element can be mounted via coupling elements or an
element for performing another type of process can be directly mounted, is provided
with two noses 24, 26. In the position of clamping element 20 shown in figure 6, the
first nose 24 can be pushed into U-shaped end part 22 and the second nose 26 can be
placed between ridges 23. The thus obtained assembly can then be rotated until the
second nose 26 comes to lie under retaining edge 18 and is secured thereby.
[0037] Figure 7 shows a further embodiment of a sanding device according to the present
invention. Use is once again made here of a carrier 3, on which is arranged a bearing
30. Bearing 30 is semicircular. An L-shaped edge 18 is further placed on carrier 3,
as in the foregoing embodiment. Recesses 31 are arranged in the upper side of the
L-shaped edge.
[0038] In the present embodiment the base 14 takes the form of a flat plate 32 which is
provided at one end with a disc-shaped part 33. This disc-shaped part 33 fits into
bearing 30. The other end 41 of plate 32 extends under the L-shaped profile 18. A
connecting piece 34 is arranged on plate 32.
[0039] The construction of the assembly described up to this point is such that from a separate
position the base 14 can first be placed with its disc 33 into bearing 30 and can
then be rotated in the bearing until distal end 41 of plate 32 is situated under L-shaped
profile 18 and is retained there. A situation obtained in this manner is shown in
figure 7.
[0040] Three recesses 31 are arranged in the upper side of L-shaped edge 18 in order to
fix base 14 in one of three possible positions. Arranged on connecting part 34 is
a tongue 35 which is provided on its front bottom side with a protrusion 36 which
fits into each of the recesses 31. For this purpose tongue 35 has a resilient form,
so that protrusion 36 can be placed into any of the recesses 31. The distal end of
tongue 35 can be moved upward again using the fingers, so that protrusion 36 is lifted
out of recess 31 and base 14 can be rotated.
[0041] As is apparent from figure 8, a sandpaper carrier 38 is arranged on connecting part
34. This can be placed releasably on connecting part 34 but can also be arranged fixedly.
Sandpaper is attached to sandpaper carrier 38. Sandpaper carrier 38 can be a rigid
element but may also be manufactured from flexible material so that the outer edges
thereof can move relative to each other during sanding, and the curvature of sandpaper
carrier 38, including the sandpaper, adapts to the workpiece for sanding.
[0042] It is further pointed out that sandpaper carrier 38 is placed obliquely relative
to carrier 3. This means that the distance between carrier 3 and sandpaper carrier
38 is greater in the vicinity of tongue 35 than in the vicinity of bearing 30. In
other words, the lower and upper edge of connecting part 34 do not extend parallel
to each other (see figure 9). This measure has been taken to enable better execution
of determined sanding operations. Sanding machine 1 can then be handled more easily
while maintaining full contact between sandpaper carrier 38 and the workpiece.
[0043] Figure 9 further shows the separate part of the sanding device, i.e. the combination
of sandpaper carrier 38 and base 32, 34 on which it is mounted.
[0044] Figure 10 finally shows the component of figure 9 from above. Here is shown that
on the distal end 41 of plate 32 a chamfering 39 is arranged for easy movement of
plate 32 to a position under the L-shaped edge 18. Slots 40 are further arranged in
order to form resilient tongues enabling practically immobile placing of plate 32
under edge 18.
[0045] It will be apparent that base 32, 34 can be readily exchanged for a base on which
a different sanding element or a different processing element is placed. Different
variants are shown in figures 11A-G. Shown successively are a rigid sanding element
of square (fig. 11A), V-shaped (fig. 11B), triangular (fig. 11C), finger-like (fig.
11D), concave (fig. 11E) and convex (fig. 11F) form and a flexible sanding element
according to the embodiment of figures 1 and 2 (fig. 11G).
[0046] It will be apparent that numerous variations can be made to the embodiments shown
here.
1. Sanding device for a sanding machine (1), comprising a carrier (3), a sanding element
(9, 10; 12) and at least two coupling elements (8, 16) with which the sanding element
(9, 10; 12) is coupled to the carrier (3), wherein a movable connection is provided
between the sanding element (9, 10; 12) and the carrier (3), characterized in that the ends of the coupling elements (8; 16) coupled to the sanding element (9, 10;
12) can move relative to each other during sanding.
2. Sanding device as claimed in claim 1, characterized in that at least one of the coupling elements (16) is flexible.
3. Sanding device as claimed in claim 1 or 2, characterized in that at least one of the coupling elements (8) is hingedly connected to the carrier.
4. Sanding device as claimed in any of the claims 1-3, characterized by means for urging the coupling elements apart at least at the position of the sanding
element (9, 10; 12).
5. Sanding device as claimed in any of the claims 1-4, characterized in that the sanding element (9, 10; 12) is connected to two coupling elements (8; 16), and
that the connecting lines between the coupling elements (8; 16) on the one hand and
the sanding element (9, 10; 12) on the other extend substantially parallel.
6. Sanding device as claimed in any of the claims 1-5, characterized in that the sanding element (9, 10) comprises a flexible supporting element (9) connected
fixedly to the coupling elements for the purpose of supporting a sheet of sandpaper
(10) for connecting thereto.
7. Sanding device as claimed in any of the claims 1-6, characterized in that the coupling elements. (16) are connected to a base (14), and that the base (14)
is releasably connected to the carrier (3).
8. Sanding device as claimed in claim 7, characterized in that the sanding element has the form of a closed sanding belt (12) which extends around
the combination of coupling elements (16) and base (14).
9. Sanding machine comprising a sanding sole (2) and a sanding device as claimed in any
of the claims 1-8, characterized in that the carrier (3) of the sanding device is formed by the sanding sole (2) of the sanding
machine.
10. Sanding machine comprising a sanding sole and a sanding device as claimed in any of
the claims 1-8 for releasable connection to the sanding sole (2).
1. Schleifvorrichtung für eine Schleifmaschine (1) mit einem Träger (3), einem Schleifelement
(9, 10; 12) und mindestens zwei Kupplungselementen (8, 16), mit denen das Schleifelement
(9, 10; 12) an den Träger (3) gekuppelt wird, wobei eine bewegliche Verbindung zwischen
dem Schleifelement (9, 10; 12) und dem Träger (3) vorgesehen ist, dadurch gekennzeichnet, dass die Enden der Kupplungselemente (8, 16), die an das Schleifelement (9, 10; 12) gekuppelt
sind, sich relativ zueinander während des Schleifens bewegen können.
2. Schleifvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass mindestens eines der Kupplungselemente (16) flexibel ist.
3. Schleifvorrichtung gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass mindestens eines der Kupplungselemente (8) gelenkig mit dem Träger verbunden ist.
4. Schleifvorrichtung gemäß einem der Ansprüche 1 bis 3, gekennzeichnet durch Mittel zum Auseinanderdrängen der Kupplungselemente mindestens an der Position des
Schleifelements (9, 10; 12).
5. Schleifvorrichtung gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Schleifelement (9, 10; 12) mit zwei Kupplungselementen (8; 16) verbunden ist
und dass die Verbindungslinien zwischen den Kupplungselementen (8; 16) auf der einen
Seite und dem Schleifelement (9, 10; 12) auf der anderen sich im Wesentlichen parallel
erstrecken.
6. Schleifvorrichtung gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Schleifelement (9, 10) ein flexibles Trägerelement (9) umfasst, das fest mit
den Kupplungselementen verbunden ist, zum Zwecke des Tragens eines Blattes Schleifpapier
(10) zum Verbinden damit.
7. Schleifvorrichtung gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Kupplungselemente (16) mit einer Basis (14) verbunden sind und dass die Basis
(14) lösbar mit dem Träger (3) verbunden ist.
8. Schleifvorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass das Schleifelement die Form eines geschlossenen Schleifbandes (12) aufweist, das
sich um die Kombination von Kupplungselementen (16) und Basis (14) herum erstreckt.
9. Schleifmaschine mit einer Schleifsohle (2) und einer Schleifvorrichtung gemäß einem
der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Träger (3) der Schleifvorrichtung durch die Schleifsohle (2) der Schleifmaschine
gebildet ist.
10. Schleifmaschine mit einer Schleifsohle und einer Schleifvorrichtung gemäß einem der
Ansprüche 1 bis 8 zur lösbaren Verbindung mit der Schleifsohle (2).
1. Dispositif de ponçage pour une machine à poncer (1), comprenant un support (3), un
élément de ponçage (9, 10 ; 12) et au moins deux éléments de couplage (8, 16) avec
lesquels l'élément de ponçage (9, 10 ; 12) est couplé au support (3), où un raccord
mobile est prévu entre l'élément de ponçage (9, 10 ; 12) et le support (3), caractérisé en ce que les extrémités des éléments de couplage (8 ; 16) couplées à l'élément de ponçage
(9, 10 ; 12) peuvent se déplacer les unes par rapport aux autres durant le ponçage.
2. Dispositif de ponçage selon la revendication 1, caractérisé en ce qu'au moins l'un des éléments de couplage (16) est flexible.
3. Dispositif de ponçage selon la revendication 1 ou 2, caractérisé en ce qu'au moins l'un des éléments de couplage (8) est relié de manière articulée au support.
4. Dispositif de ponçage selon l'une quelconque des revendications 1 à 3, caractérisé par des moyens pour amener les éléments de couplage à s'éloigner au moins à la position
de l'élément de ponçage (9, 10 ; 12).
5. Dispositif de ponçage selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'élément de ponçage (9, 10 ; 12) est relié à deux éléments de couplage (8 ; 16),
et en ce que les lignes de raccord entre les éléments de couplage (8 ; 16) d'une part et l'élément
de ponçage (9, 10 ; 12) d'autre part s'étendent de manière sensiblement parallèle.
6. Dispositif de ponçage selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'élément de ponçage (9, 10) comprend un élément de support flexible (9) relié fixement
aux éléments de couplage dans le but de supporter une feuille de papier de ponçage
(10) pour la relier à celui-ci.
7. Dispositif de ponçage selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les éléments de couplage (16) sont reliés à une base (14), et en ce que la base (14) est reliée de manière libérable au support (3).
8. Dispositif de ponçage selon la revendication 7, caractérisé en ce que l'élément de ponçage a la forme d'une bande de ponçage fermée (12) qui s'étend autour
de la combinaison des éléments de couplage (16) et de la base (14).
9. Machine de ponçage comprenant une semelle de ponçage (2) et un dispositif de ponçage
selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le support (3) du dispositif de ponçage est formé par la semelle de ponçage (2) de
la machine de ponçage.
10. Machine de ponçage comprenant une semelle de ponçage et un dispositif de ponçage selon
l'une quelconque des revendications 1 à 8 pour un raccord libérable à la semelle de
ponçage (2).