[0001] The invention relates to an insole, particularly to a pre-shaped insole, to be placed
in a shoe. The invention furthermore relates to a container for insoles, and to an
assembly of such a container and at least one insole.
[0002] Insoles have been known for quite some time now in many varieties and variations.
Such insoles are often sold packaged in pairs, and are used for offering comfort to
the foot. Their principal functions are offering support to the foot in the shoe and
offering shock absorption, their secondary function may be the reduction of adverse
effects of enclosing the foot in a shoe for a shorter or longer period of time, such
as the discomfort of foot odour.
[0003] Many of the existing insoles are meant to be used for a longer period of time. During
use over a longer period of time the insoles loose their secondary functions after
some time as the effect of active substances providing said secondary functions usually
is temporary. Moreover the insoles may after some time loose their shape as a result
of which the walking comfort is reduced. A further drawback of such pre-shaped insoles
is that they are rather thick which reduces the fit of the footwear of the user. When
using such rather thick pre-shaped insoles a separate insole that shoe manufacturers
place in their footwear moreover usually has to be removed for getting the right fit.
[0004] On the other hand thin insoles are known that are meant for single use or for use
during a shorter period of time. A drawback of these thin insoles is that they are
limp and as a result usually difficult to place in the shoe. In addition the active
substances, that may be incorporated in such a thin insole, usually are in direct
contact with the ambient as a result the effect of the active substances decreases
very rapidly or is totally undone prior to the actual use.
[0005] It is an object of the invention to provide insoles for increasing the comfort of
footwear during walking and counteracting the adverse effects of enclosing the foot
in a shoe for a longer or shorter period of time.
[0006] A further object of the invention is to package the insoles in new, at least alternative
way.
[0007] To that end the invention provides an insole to be placed in a shoe, wherein the
insole comprises two or more layers and wherein at least one of the two or more layers
comprises active substances and particularly is impregnated therewith.
[0008] Preferably the two or more layers are connected to each other by arranging one or
more polymers in between them from a group comprising: ethylene vinyl acetate, polyurethane,
polyvinyl acetate, polycaprolactone, polyethylene and copolyamide. In addition to
good adhesion properties said one or more polymers offer an important contribution
to the firmness of the laminate. The one or more polymers may be added in several
forms.
[0009] When it is added as a powder, it is arranged on the substrate to be glued by sprinkling
and is subsequently heated (by means of for instance infrared radiation, after which
the second substrate is arranged and the laminate is pressed and finally cooled in
air.
[0010] Another possibility is the heating of an at room temperature solid polymer to beyond
its melting point after which it is arranged as a viscous liquid on the substrate
to be glued (so-called "hot melt technique"), after which the second substrate is
arranged and pressed and finally the laminate is cooled in air.
[0011] A third possibility is arranging the polymer on the substrate in the form of a waterborne
dispersion by means of rollers, after which the second substrate is arranged and pressed
and subsequently the laminate is dried in an oven.
[0012] In an embodiment the polymer is arranged in a quantity of 30 to 70 g/m
2, so that there is sufficient adhesion, yet it does not form a blocking layer, so
that water vapour and air are still able to pass through. For giving sufficient firmness
to the laminate preferably ethylene vinyl acetate, poly vinyl acetate or polycaprolatone
are used. Active substances such as for instance moisture and/or odour absorbing substances
may be added to these polymers.
[0013] In case the polymer is arranged in the form of a powder, liquid active substances,
such as perfumes, preferably as micro capsules or as inclusions mixed with the polymer
are incorporated in the glue layer.
[0014] Starch, cyclodextrin, polysaccharides and gelatin may be used for the walls of the
micro capsules. Said materials have the advantage of being fully or partially soluble
in moisture, as a result of which the micro capsules under the influence of moisture
action and friction will not release their contents until desirable to the user.
[0015] In case of an aqueous dispersion the active substances - in liquid or solid form
- will have to have the property of being soluble or emulsifiable therein. If such
is not the case then these active substances will have to be arranged on the substrate
in a separate action, for instance by spraying. This is also the case when the polymer
is arranged as a warm molten liquid.
[0016] Preferably the insole is made so thin as to obtain a proper fit and walking comfort
without having to remove the insoles that may be present in the shoe supplied by the
manufacturer. In comparison with conventional insoles the thin insoles according to
the invention offer a more acceptable fit. In addition the breathing capacity may
be better because air has to travel a shorter distance through the thin insole. Furthermore
thin insoles according to the invention have the advantage that thin insoles take
up less volume, which is advantageous in the processing, the transport and storage,
and that a relatively large number of such thin insoles may be packaged in a convenient
consumer packaging.
[0017] Preferably the two or more layers each have their own functionality. In an embodiment
the insole comprises a moisture permeable layer.
[0018] Preferably said moisture permeable layer is provided with openings for transport
of moisture to an underlying layer of the insole.
[0019] Preferably the moisture permeable layer is entirely or partially made of one or more
materials selected from a group comprising: polyester, polypropylene, polyacrylate
and viscose.
[0020] Particularly suitable materials for this upper layer are polypropylene and/or polyester,
optionally treated with surfactants that ensure accelerated moisture transport.
[0021] Preferably the moisture permeable layer comprises a knitting, fabric or non-woven.
[0022] Preferably the moisture permeable layer is provided with one or more active substances
selected from a group comprising: surfactants, perspiration inhibitors, antibacterials,
microorganism growth inhibitors, fatty matters, perfumes, odour absorbing substances
and odour inhibitors.
[0023] Preferably the perspiration inhibitors comprise one or more selected from a group
comprising: aluminium compounds, zinc compounds, tea tree oil and salvia oil.
[0024] Preferably the moisture permeable layer forms an outermost layer of the insole for
placing at a side of the insole facing away from the sole of the shoe.
[0025] Preferably the thickness of the moisture permeable layer is smaller than or equal
to 0.6 mm, and preferably is larger than or equal to 0.3 mm.
[0026] In an embodiment the insole comprises a shock absorbing layer.
[0027] Preferably said shock absorbing layer is entirely or partially made of an elastomer,
such as a rubber, foamed material and/or a non-woven.
[0028] Preferably the shock absorbing layer is entirely or partially made of one or more
materials selected from a group comprising: latex foam, polyurethane foam, ethylene
vinyl acetate, thermoplastic rubber and polyvinyl acetate.
[0029] Preferably the shock absorbing layer is entirely or partially made of non-woven,
and wherein the non-woven comprises one or more materials selected from a group comprising:
polyester, viscose, blends of polyester and viscose, and cellulose wood pulp.
[0030] Preferably the shock absorbing layer or an additional layer, comprises a polyester
non-woven material, preferably provided or impregnated with a very high dose of active
carbon for effective control of undesirable foot odours.
[0031] Preferably the shock absorbing layer is provided with one or more active substances
selected from a group comprising: moisture absorbing substances, odour absorbing substances,
cooling substances, perfumes, anti-perspirants, antibacterials, cooling substances
and active carbon.
[0032] Preferably the moisture absorbing substances comprise cellulose derivatives, preferably
carboxymethyl cellulose, hydroxyethyl cellulose, starch, xanthan gum, sodium polyacrylate,
viscose and/or wood pulp.
[0033] The active substances may be incorporated in the shock absorbing layer in the form
of micro capsules and/or in the form of inclusions.
[0034] The micro capsules and/or inclusions preferably comprise an outer wall that is soluble
in moisture.
[0035] Preferably the thickness of the shock absorbing layer is smaller than or equal to
3.0 mm, and preferably is larger than or equal to 0.3 mm.
[0036] In an embodiment the insole comprises a supporting layer.
[0037] Preferably said supporting layer comprises a foam material. Preferably the foam material
comprises ethylene vinyl acetate foam and/or polyethylene foam.
[0038] Preferably the supporting layer is perforated.
[0039] Preferably the supporting layer comprises recesses in which a resilient material
has been placed. Preferably the resilient material comprises an elastomer, preferably
a thermoplastic elastomer. Preferably the recesses are at least arranged in a part
of the insole for supporting a heel of the user and/or in a part of the insole for
supporting the ball of the foot of the user.
[0040] In a further embodiment the resilient materials comprise visco-elastic materials,
such as for instance a thermoplastic elastomer. This particularly occurs in recesses
at positions where the ball of the foot and the heel of the foot rest, because during
the walking motion the most pressure is exerted at those places. Such an elastomer
or visco-elastic part offers a springy effect due to which walking or running requires
less energy.
[0041] Preferably said supporting layer forms an outermost layer of the insole for placing
at a side of the insole facing the sole of the shoe.
[0042] Preferably the thickness of the supporting layer is smaller than or equal to 6 mm.
[0043] In an embodiment the insole comprises at least three layers, wherein the at least
three layers comprise a moisture permeable layer, a shock absorbing layer and a supporting
layer. The shock absorbing layer preferably is placed in between the moisture permeable
layer and the supporting layer.
[0044] Such an insole generally consists of at least three layers, comprising a moisture
permeable upper layer of woven fabric, an intermediate layer having a large shock
absorbing and water absorbing capacity, and a bottom layer offering support and able
to provide the insole with an optimal fit.
[0045] The upper layer is characterised by its ability to transport the moisture secreted
by the foot as fast as possible to the layer or layers of the insole that lie underneath
it. An important secondary property of the upper layer is the comfortable feel to
the skin of the foot so that the insole can also be used bare-footed. In an embodiment
it is preferred that the upper layer further is wear-resistant and colourproof which
gives the insole an acceptable durability. In addition the colour of the upper layer
is selected such so as to be least striking in comparison with the colour of the inside
of the majority of the commercially available shoes. The material of the upper layer
may furthermore be impregnated with substances that inhibit the growth of microorganisms,
so as to reduce the development of undesirable foot odours.
[0046] The intermediate layer preferably is made of polyurethane foam having both a large
shock absorbing and water absorbing capacity. Polyurethane foam provides an advantageous
shock absorption and has a more permanent elasticity and less permanent deformation
as a result of discontinuous pressure load during the walking motion than for instance
latex foam. The polyurethane foam is for instance made by pressing together and simultaneous
binding ground open-celled flexible polyurethane foam, which results in a relative
high density of approximately 200 kg/m
3. Another advantage of this material is that it has a large water absorption capacity.
Moreover said material is capable of absorbing water very quickly. In addition pigments,
active carbon and antibacterials may very well be added to this material.
[0047] In an alternative embodiment the intermediate layer or an additional layer comprises
a polyester and/or viscose non-woven with sodium polyacrylate therein. Preferably
the sodium polyacrylate is chemically bound, glued or imbibed in the non-woven. Said
sodium polyacrylate has a very high moisture absorbing capacity, due to which perspiration
moisture of the foot is rapidly taken away.
[0048] The bottom layer or supporting layer preferably is provided with a foam material,
for instance cross-linked ethylene vinyl acetate foam, offering support to the foot
and the body. Said ethylene vinyl acetate foam preferably has a density of 115 to
135 kg/m
3, and a hardness of 35 to 40 Shore A. Furthermore the foam material has a low permanent
deformability, namely a thickness reduction of 5% at the most after 10800 pressing
motions (testing method Satra PM 159), and proper shock absorbing properties characterised
by a reduction in the fall deceleration of DIN rubber of at least 25% (testing method
Satra TM 142).
[0049] Although the third layer of the insole offers a certain degree of firmness, it usually
turns out to be insufficient for obtaining the desired firmness. By using the above-mentioned
gluing by means of one or more polymers, a good firmness can be obtained. In an embodiment
extra firmness is obtained by providing the insole with a slightly hollow shape. Said
hollow shape may for instance be obtained by means of raised edges. The insole may
also be given a slight curvature which, after the insole has been placed in the shoe,
is ended by the pressure of the foot. In addition the insole may in the longitudinal
direction be provided with a line-shaped thinning, along which the insole may bend
during insertion. Naturally several line-shaped weakenings may be arranged for this
purpose.
[0050] In the case of the alternative embodiments, wherein the intermediate layer comprises
a non-woven material, the wanted firmness is obtained by using ethylene vinyl acetate
foam having a density of 70 to 90 kg/m
3, a hardness of 20 to 25 Shore A.
[0051] Preferably a bottom layer of ethylene vinyl acetate foam having a closed cell structure
is perforated for making the transport of moisture possible. Preferably the perforations
have a round shape having a diameter larger than or equal to 1 mm, and preferably
smaller than or equal to 5 mm.
[0052] In a embodiment the two or more layers are connected to each other by means of a
glue connection, fusing together and/or ultrasonic welding. By laminating the two
or more layers by means of glue and heating the laminate (after drying) in an oven
of approximately 170°C for at least 1 minute and subsequently pressing it together
in a steel die having recesses according to specified dimensions, the insole may be
given an optimal fit. For optimal control of foot odours for instance active substances
such as perfumes and antibacterials may be added to the glue.
[0053] In an embodiment the insole comprises indentations and/or continuous perforations
extending through one or more layers. In an embodiment the one or more layers are
pressed together near the indentations and/or continuous perforations.
[0054] Preferably the indentations and/or continuous perforations are defined by hollow
needles or little tubes.
[0055] In an embodiment the active substances show a phase transition in a temperature range
of 20 to 36 degrees Celsius. In a first further development of the embodiment of the
insole compounds may be added that melt at approximately 32 degrees Celsius for extracting
energy and heat from the foot, as a result the insole may offer a cooling effect to
the feet. In a second further development of this embodiment of the insole compounds
may be added that solidify at approximately 30 degrees Celsius for releasing energy,
as a result of which the insole may give a heating effect to the feet. Such substances
may also be combined, as a result of which at too high a temperature of the foot the
substances extract heat and at too low a temperature of the foot release energy. As
a result the foot temperature is constantly kept in a comfortable temperature zone.
[0056] In a further embodiment the insole comprises heat-conducting elements. Preferably
the heat-conducting elements extend from a portion of the insole which when used is
placed near the foot arch to a portion placed near the toes and/or a portion placed
near the heel. Heat from the warmer foot arch may thus be transported to the colder
projecting parts of the feet.
[0057] In an embodiment the active substances show a phase transition under the influence
of a mechanic shock. In a further embodiment at least in one of the layers of the
insole one or more compartments have been formed containing the active substances.
Preferably the active substances comprise an aqueous solution of sodium acetate. Preferably
the aqueous solution of sodium acetate is super cooled so that it crystallises when
the solution is activated by the user by means of a motion of the toes. Due to the
mechanic shock crystallisation heat is released as a result of which the insole warms
the foot.
[0058] An advantage of this solution is that it can be reused by reactivating the sodium
acetate by heating the sole and subsequently cooling it down.
[0059] In an embodiment the insole comprises heat reflecting ceramic fibres. Such ceramic
fibres transmit thermal energy as a result of the vibrations in far infrared. The
feet may be offered extra warmth by means of the insole in this way as well.
[0060] In an embodiment the active substances are soluble in moisture and during dissolving
in moisture are subjected to an endothermal reaction. Preferably the active substances
comprise one or more selected from a group comprising: ammonium chloride, potassium
nitrate, ammonium nitrate and Glauber salt (Na
2SO
4 * 10 H
2O). When feet secrete perspiration the sole will thus offer a cooling effect to the
feet.
[0061] In an embodiment the active substances are enclosed in a semi-permeable matrix. Such
a semi-permeable matrix for instance allows perspiration moisture to pass through,
yet stops transport of the compounds to the outside. Using such a semi-permeable matrix
is particularly advantageous in combination with the active substances incorporated
herein, such as for instance the above-mentioned active substances that are soluble
in moisture and during dissolving in moisture are subjected to an endothermal reaction.
[0062] In an embodiment the active substances comprise magnetic, antistatic and/or electrically
conductive materials.
[0063] Preferably the insole is provided with magnetic means for discharging magnetic fields.
Particularly when said magnetic materials are positioned at locations where the so-called
gang/ions of the feet are located, said insoles will stimulate the ganglions of the
feet and thus improve the blood circulation and increase the oxygen discharge level.
As a result the insole may provide the entire body of the user with extra energy.
[0064] Preferably the insole is provided with antistatic and/or electrically conductive
materials. Said antistatic and/or electrically conductive materials may stop the build-up
of static electricity in the body and discharge it via the ground, as a result of
which a safeguard against electric shocks can be obtained.
[0065] In an embodiment the insole has a thickness that decreases from the heel side towards
the toe side, and it is preferably provided with upward oriented support portions
at the positions where, when used, the foot arch and the heel rest. Preferably the
thickness of the insole, at least a portion of the insole for supporting a heel of
a user, is smaller than or equal to 6 mm, and preferably smaller than or equal to
4 mm. Preferably the thickness of the insole decreases from a heel side of the insole
towards a toe side of the insole. Preferably the thickness of the toe side is smaller
than or equal to 1 mm.
[0066] Preferably this embodiment with decreasing thickness relates to a pre-shaped insole
to be placed in a shoe. The shape of the insole is selected such so as to offer an
optimal fit in the majority of commercially available shoes (of a certain size), and
to distribute the pressure of the body exerted on the insole as much as possible over
the surface of said insole. This is characterised by accurately chosen lengths and
breadths, by the thickness that decreases from the heel side to the toe side and by
upward oriented supporting parts at positions where the foot arch and the heel rest.
The thickness course is chosen such that it is possible to insert the insole in the
shoe without having to remove the inner sole that is already present in the shoe and
without causing a squeezing effect.
[0067] In an embodiment the side edges of the insole comprise a raised edge. In this way
the insole is able to better support the foot, particularly the heel of the user,
and particularly sideward as well. Due to this raised edge the foot is also cooled
off to a lesser degree at lower ambient temperatures.
[0068] In an embodiment the insole comprises an outermost layer which at a side oriented
to an outer side of the insole is provided with size marks. The insole may thus be
cut to size by the user.
[0069] According to a further aspect the invention provides a method for manufacturing an
insole as described above, wherein:
the two or more layers are laminated by means of glue;
the laminate after drying is heated in an oven, and subsequently is pressed into the
wanted shape in a die.
[0070] Preferably the die presses the laminate in the wanted profile shape.
[0071] Preferably the wanted profile shape of the insole comprises a raised edge at the
side edges of the insole.
[0072] According to a further aspect the invention provides an assembly comprising insoles
having a toe side and a heel side and a container for accommodating the insoles therein,
wherein the container comprises an opening for taking one or more of the insoles out
of the container, and a lid for reclosable closing of the opening.
[0073] With the container according to the invention the possibility is offered for packaging
a large number of insoles in one packaging, wherein when needed a new pair of insoles
can be taken out of the packaging, after which the packaging can be reclosed.
[0074] On the one hand the invention thus provides a new and alternative packaging for insoles
that is environment-friendlier than the commonly used disposable packaging in which
the known insoles packaged in pairs are offered in shops.
[0075] On the other hand the assembly according to the invention, wherein two or more pairs
of insoles are placed in the container, provides a spare stock of insoles. When the
pair of insoles in use lose their shape and/or their secondary functions after some
time, there are further pairs of insoles in the container for replacing the used ones.
By regularly using new insoles the comfort of footwear during walking and the disadvantageous
effects of enclosing the foot in a shoe for a longer period of time may be counteracted.
[0076] In an embodiment the lid and/or the container comprise a substantially airtight closure
for closing off the opening. Due to the airtight closure it is at least substantially
prevented that the active substances in the insoles in the container prematurely loose
their effect.
[0077] In an embodiment the container comprises an elongated box having a first and a second
end, wherein the first end comprises the opening and wherein the second end is permanently
closed. By placing the opening at an end the insoles may easily be taken out of the
container substantially without bending or folding them.
[0078] Preferably the first end and the lid comprise a first and a second circumferential
edge, respectively, wherein the first and the second circumferential edge overlap
each other for closing the opening. Thus the lid and the first end may be slid over
each other for closing off the opening. In a simple embodiment the first circumferential
edge comprises a neck and the second circumferential edge comprises a collar, wherein
the collar can be slid over the neck.
[0079] In a further embodiment the first and the second circumferential edge comprise first
and second closing means, respectively, wherein the first and second closing means
in cooperation with each other form a closure, preferably a reclosable and/or airtight
closure.
[0080] In a simple embodiment the first and the second closing means comprise a groove and
a projecting rib, respectively, wherein the groove is placed at a side facing the
second circumferential edge and at least partially runs around the first circumferential
edge and wherein the rib is placed at a side facing the first circumferential edge
and at least partially runs around the second circumferential edge for forming a closure
in cooperation with the groove. Preferably the elongated box comprises longitudinal
side walls defining a substantially rectangular cross-section, wherein two opposite
longitudinal side walls are provided with the groove or the rib.
[0081] In a further embodiment the lid forms a cap for enclosing the first end of the container.
Preferably the cap is provided with thumb surfaces for releasing the cap from the
first end of the container by pressing in. Preferably the cap comprises longitudinal
side walls defining a substantially rectangular cross-section, wherein the thumb surfaces
preferably are placed at two opposite longitudinal side walls of the cap. By pressing
in the thumb surfaces of the cap which surfaces are situated at opposite longitudinal
side walls, the cap will deform, as a result of which the two other longitudinal side
walls that are situated substantially perpendicular to the longitudinal side walls
having the thumb surfaces, deform oriented to the outside wherein a groove and rib
closure as described above is released after which the cap can be taken off from the
container.
[0082] In an embodiment the elongated box comprises longitudinal side walls defining a substantially
rectangular cross-section, wherein two opposite longitudinal side walls of the elongated
box at least in part substantially follow the contours of an insole. Preferably the
second end substantially follows the contours of a heel side of the insole. Preferably
the first end substantially follows the contours of a toe side of the insole. Thus
the container with lid has the same contours as the insoles placed therein, wherein
the cap for closing the opening is placed at the toe side of the elongated box and
the insoles placed therein.
[0083] Preferably the cap is formed such that it encloses a part of the insole, preferably
at the toe side of the insole. After taking away the cap the insoles, at least the
toe side thereof, protrude from the container and may thus easily be taken out of
the container.
[0084] According to a further aspect the invention provides a container, adapted and intended
for use in an assembly for containing insoles as described above.
[0085] According to a further aspect the invention provides a case for a stack of insoles
comprising an opening for taking the insoles out of the case, and a lid for reclosable
closing of the opening. Preferably the case has a toe side and a heel side, respectively,
wherein the lid preferably is placed at a toe side of the case. Preferably the case
and/or the lid comprise a substantially airtight closure for closing the opening.
[0086] The invention will be further elucidated on the basis of the further exemplary embodiments
shown in the attached drawings, in which:
Figure 1 shows a schematic top view of an insole according to the invention;
Figure 2 shows a schematic view in cross-section, partially in exploded condition,
of a part of the insole of figure 1,
Figure 3 shows a schematic view of a container for accommodating the insoles according
to the invention therein;
Figure 4 shows a schematic view of the container of figure 3, wherein the cap for
reclosable closing of the opening is detached, and
Figures 5A and 5B show schematic bottom views of the cap.
[0087] Figures 1 and 2 show a top view and a part of a view in cross-section of an exemplary
embodiment of an insole 4 according to the invention. The upper side of said insole
4 is provided with indentations 41 that are regularly distributed over the surface.
Said indentations 41 can be made by pressing a stamp into the upper side of the insole
4. The layers 42, 43, 44 of the insole 4 are pressed together as shown in figure 2.
[0088] The exemplary embodiment of the insole 4 as shown in figure 2 comprises three layers,
namely a moisture permeable upper layer 42, a moisture absorbing layer 43 and a supporting
layer 44.
[0089] The moisture absorbing intermediate layer 43 is provided with moisture absorbing
substances 431. Due to the indentations 41 an improved moisture transport to the moisture
absorbing intermediate layer 43 is achieved.
[0090] At its bottom side 441, the supporting layer 44 is at least partially provided with
antiskid 442, as a result of which the insole 4 slides less over the inner sole of
a shoe.
[0091] The three layers 42, 43, 44 are laminated into an insole by means of a glue connection.
The intermediate layer between the layers 42, 43, 44 therefore comprises glue 45 for
instance comprising one or more polymers such as discussed above. In addition said
intermediate layer is provided with aromatic substances 46 such as perfumes.
[0092] Figure 3 shows an exemplary embodiment of a container 1 for insoles 4 according to
the invention. The container 1 comprises a flat box 2 having a substantially rectangular
cross-section. At a first end 21 the box 2 is provided with an opening which is reclosably
closed off by a cap 3. In this exemplary embodiment both the box 2 and the cap 3 are
made of synthetic material. At a second end 22 the box is furthermore permanently
closed.
[0093] The longitudinal side walls 23, 24 of the flat box 2 and the cap 3 comprise an upper
side 24, 31 and a bottom side (not shown) which together substantially follow the
contours of an insole 4. In this exemplary embodiment the first end 21 of the box
2 and the cap 3 follow the contours of a toe side of the insole 4, and the second
end 22 of the box 2 follows the contours of a heel side of the insole 4. Because the
toe side of the insole 4 comprises the widest portion of said insole 4, the opening
is placed at or near the widest portion of the box 2, as a result of which the insoles
4 can easily be placed in the box 2 and can easily be taken out of the box 2 by the
user.
[0094] Due to their shape and/or surface, the upper side 24 and the bottom side (not shown)
of the box 2 are especially suitable for placing informative texts or pictures, brand
indications and/or advertisements on them.
[0095] The cap 3 of the preferred embodiment as shown in figure 3 encloses the toe side
of insoles 4 placed in the box 2. The upper side 31 and the bottom side (not shown)
of the cap 3 is provided with thumb surfaces 32 for releasing the cap 3 from the box
2 by pressing them in, as described below.
[0096] Figure 4 shows the preferred embodiment of figure 3 with the box 2 and the cap 3
in a separated condition. A stack 7 of insoles 4 is schematically indicated which
can be accommodated in the container 1. In figure 4 the entire stack 7 is partially
slid out of the box 2. When the entire stack 7 is slid into the box 2 only a small
portion of the toe side of the insoles 4 protrudes from the box 2, which small portion
is enclosed by the cap 3 when the container 1 is closed off.
[0097] In the opened condition as shown in figure 4 the first end 21 of the box 2 is provided
with a circumferential edge 8. The transition of the longitudinal side planes 23,
34 of the box 2 to the circumferential edge 8 comprise a step 82 oriented towards
the inside of the box 2. A circumferential edge 9 of the cap 3 can now be fittingly
slid over the circumferential edge 8 of the box 2 for closing off the opening of the
box 2. Here the outer sides of the side walls 31, 33, 35, 36 of the cap 3 substantially
continuously connect to the outer sides of the longitudinal side planes 23, 24 of
the box 2.
[0098] The container 1 according to this exemplary embodiment is also provided with closing
means formed by grooves 81 in the circumferential edge 8 and ribs 10 extending towards
the inner side of the cap 3. When closing or reclosing the container 1, the cap 3
is slid over the circumferential edge 8 of the box 2. When the circumferential edge
9 of the cap 3 at least substantially abuts the step 82 of the box 2, the projecting
ribs 10 fall into the grooves 81 for forming a closure. As a result a substantially
airtight closure between the cap 3 and the box 2 is achieved.
[0099] In an exemplary embodiment the longitudinal side walls 24, 23 of the box 2 and the
side walls 31, 34, 35, 36 of the cap 3 are formed as a surface that is convex to the
outside, such as shown in relation to the cap 3 in figure 5A. For opening the container
1 the thumb surfaces or pressure surfaces 32, 34 at the upper side 31 and the lower
side 33 of the cap 3 have to be pressed in in the direction A as shown in figure 5B.
As a result the cap 3 is deformed such that the side walls 35, 36 give way in the
direction B as shown in figure 5B. As a result the ribs 10 are at least partially
lifted out of the grooves 81 due to which the closure can be released for opening
the container 1.
[0100] It is observed here that the embodiments of the invention described above are meant
to illustrate the invention and not to limit the invention. A person skilled in the
art will certainly be capable of designing alternative embodiments that fall within
the scope of protection of the attached claims.
1. Insole to be placed in a shoe, wherein the insole comprises two or more layers and
wherein at least one of the two or more layers comprises active substances and particularly
is impregnated therewith.
2. Insole according to claim 1, wherein the two or more layers comprise a moisture permeable
layer, wherein said moisture permeable layer preferably is provided with openings
for a transport of moisture to an underlying layer of the insole, wherein the moisture
permeable layer preferably comprises a knitting, fabric or non-woven, wherein the
moisture permeable layer preferably forms an outermost layer of the insole for placing
at a side of the insole facing away from the sole of the shoe, and wherein the thickness
of the moisture permeable layer preferably is smaller than or equal to 0.6 mm, and
preferably is larger than or equal to 0.3 mm.
3. Insole according to claim 2, wherein the moisture permeable layer is entirely or partially
made of one or more materials selected from a group comprising: polyester, polypropylene,
polyacrylate and viscose.
4. Insole according to claim 2 or 3, wherein the moisture permeable layer is provided
with one or more active substances selected from a group comprising: surfactants,
perspiration inhibitors, antibacterials, microorganism growth inhibitors, fatty matters,
perfumes, odour absorbing substances and odour inhibitors.
5. Insole according to claim 4, wherein the perspiration inhibitors comprise one or more
selected from a group comprising: aluminium compounds, zinc compounds, tea tree oil
and salvia oil.
6. Insole according to claim 1, wherein the two or more layers comprise a shock absorbing
layer, wherein said shock absorbing layer preferably is entirely or partially made
of a foam material and/or a non-woven, and wherein the thickness of the shock absorbing
layer preferably is smaller than or equal to 3.0 mm, and preferably is larger than
or equal to 0.3 mm.
7. Insole according to claim 6, wherein the shock absorbing layer is entirely or partially
made of one or more materials selected from a group comprising: latex foam, polyurethane
foam, ethylene vinyl acetate, thermoplastic rubber and polyvinyl acetate.
8. Insole according to claim 6, wherein the shock absorbing layer is entirely or partially
made of non-woven, and wherein the non-woven comprises one or more materials selected
from a group comprising: polyester, viscose, blends of polyester and viscose, and
cellulose wood pulp.
9. Insole according to claim 8, wherein the shock absorbing layer comprises a layer of
sodium polyacrylate, wherein the sodium polyacrylate is cross-linked with the non-woven.
10. Insole according to any one of the claims 6-9, wherein the shock absorbing layer is
provided with one or more active substances selected from a group comprising: moisture
absorbing substances, odour absorbing substances, perfumes, anti-perspirants, antibacterials,
cooling substances and active carbon.
11. Insole according to claim 10, wherein the moisture absorbing substances comprise cellulose
derivatives, preferably carboxymethyl cellulose, hydroxyethyl cellulose, starch, xanthan
gum, sodium polyacrylate, viscose and/or wood pulp.
12. Insole according to any one of the claims 6-11, wherein the active substances are
incorporated in the shock absorbing layer in the form of micro capsules and/or in
the form of inclusions, and wherein the micro capsules preferably comprise an outer
wall that is soluble in moisture.
13. Insole according to claim 1, wherein the two or more layers comprise a supporting
layer, wherein said supporting layer preferably comprises a foam material, wherein
said supporting layer preferably forms an outermost layer of the insole for placing
at a side of the insole facing the sole of the shoe, and wherein the thickness of
the supporting layer preferably is smaller than or equal to 6 mm, preferably smaller
than or equal to 4 mm.
14. Insole according to claim 13, wherein the foam material preferably comprises ethylene
vinyl acetate foam and/or polyethylene foam.
15. Insole according to claim 13 or 14, wherein the supporting layer is perforated.
16. Insole according to claim 13, 14 or 15, wherein the supporting layer comprises recesses
in which a resilient material has been placed, wherein the resilient material preferably
comprises an elastomer, preferably a thermoplastic elastomer, and wherein the recesses
preferably are at least arranged in a part of the insole for supporting a heel of
the user and/or a part of the insole for supporting the ball of the foot of the user.
17. Insole according to any one of the preceding claims, wherein the insole comprises
at least three layers, wherein the at least three layers comprise a moisture permeable
layer, a shock absorbing layer and a supporting layer, wherein the shock absorbing
layer preferably is placed in between the moisture permeable layer and the supporting
layer.
18. Insole according to any one of the preceding claims, wherein the two or more layers
are connected to each other by means of a glue connection, fusing together and/or
ultrasonic welding.
19. Insole according to any one of the preceding claims, wherein the insole comprises
indentations and/or continuous perforations extending through one or more layers,
wherein preferably the one or more layers are pressed together near the indentations
and/or continuous perforations, and wherein the indentations and/or continuous perforations
preferably are defined by hollow needles or little tubes.
20. Insole according to any one of the preceding claims, wherein the active substances
show a phase transition in a temperature range of 20 to 36 degrees Celsius.
21. Insole according to any one of the preceding claims, wherein the insole comprises
heat-conducting elements, which preferably extend from a portion of the insole which
when used is placed near the foot arch to a portion placed near the toes and/or the
heel.
22. Insole according to any one of the preceding claims, wherein the active substances
show a phase transition under the influence of a mechanic shock, wherein preferably
at least in one of the layers of the insole one or more compartments have been formed
containing the active substances, wherein the active substances preferably comprise
an aqueous solution of sodium acetate.
23. Insole according to any one of the preceding claims, wherein the insole comprises
heat reflecting ceramic fibres.
24. Insole according to any one of the preceding claims, wherein the active substances
are soluble in moisture and during dissolving in moisture produce an endothermal reaction,
wherein the active substances preferably comprise one or more selected from a group
comprising: ammonium chloride, potassium nitrate, ammonium nitrate and Glauber salt.
25. Insole according to claim 24, wherein the active substances are enclosed in a semipermeable
matrix.
26. Insole according to any one of the preceding claims, wherein the active substances
comprise magnetic, antistatic and/or electrically conductive materials.
27. Insole according to any one of the preceding claims, wherein the thickness of the
insole decreases from a heel side of the insole towards a toe side of the insole,
wherein the thickness of a portion of the insole for supporting a heel of a user,
preferably is smaller than or equal to 6 mm, preferably smaller than or equal to 4
mm.
28. Insole according to claim 27, wherein the thickness of a portion of the insole for
supporting the toes of a user is smaller than or equal to 1 mm.
29. Insole according to any one of the preceding claims, wherein the side edges of the
insole comprise a raised edge.
30. Insole according to any one of the preceding claims, wherein the insole comprises
an outermost layer which at a side oriented to an outer side of the insole is provided
with size marks.
31. Method for manufacturing an insole according to any one of the preceding claims, wherein:
the two or more layers are laminated by means of glue;
the laminate after drying is heated in an oven, and subsequently is pressed into the
wanted shape in a die,
wherein preferably the die presses the laminate in the wanted profile shape, and
wherein the wanted profile shape preferably provides the insole with a raised edge
at the side edges of the insole.
32. Method according to claim 31, wherein the glue comprises one or more polymers from
a group comprising: ethylene vinyl acetate, polyurethane, polyvinyl acetate, polycaprolactone,
polyethylene and copolyamide.
33. Assembly comprising insoles having a toe side and a heel side and a container for
accommodating the insoles therein, wherein the container comprises an opening for
taking one or more of the insoles out of the container, and a lid for reclosable closing
of the opening, wherein the lid and/or the container preferably comprise a substantially
airtight closure for closing off the opening.
34. Assembly according to claim 33, wherein the container comprises an elongated box having
a first and a second end, wherein the first end comprises the opening and wherein
the second end is permanently closed.
35. Assembly according to claim 34, wherein the first end and the lid comprise a first
and a second circumferential edge, respectively, wherein the first and the second
circumferential edge overlap each other for closing the opening, wherein preferably
the first circumferential edge comprises a neck and the second circumferential edge
comprises a collar, wherein the collar can be slid over the neck.
36. Assembly according to claim 35, wherein the first and the second circumferential edge
comprise first and second closing means, respectively, wherein the first and second
closing means in cooperation with each other form a closure.
37. Assembly according to claim 36, wherein the first and the second closing means comprise
a groove and a projecting rib, respectively, wherein the groove is placed at a side
facing the second circumferential edge and at least partially runs around the first
circumferential edge and wherein the rib is placed at a side facing the first circumferential
edge and at least partially runs around the second circumferential edge for forming
a closure in cooperation with the groove.
38. Assembly according to claim 36 or 37, wherein the elongated box comprises longitudinal
side walls defining a substantially rectangular cross-section, wherein two opposite
longitudinal side walls are provided with the groove or the edge.
39. Assembly according to any one of the claims 34-38, wherein the elongated box comprises
longitudinal side walls defining a substantially rectangular cross-section, wherein
two opposite longitudinal side walls of the elongated box at least partially substantially
follow the contours of an insole, wherein preferably the second end substantially
follows the contours of a heel side of the insole, and wherein preferably the first
end substantially follows the contours of a toe side of the insole.
40. Assembly according to claim 39, wherein the lid forms a cap for enclosing a toe side
of insoles placed in the container, wherein the cap preferably is provided with thumb
surfaces for releasing the cap from the first end of the container by pressing in,
and wherein the cap preferably comprises longitudinal side walls defining a substantially
rectangular cross-section, wherein the thumb surfaces preferably are placed at two
opposite longitudinal side walls of the cap.
41. Container, adapted and intended for use in an assembly according to claims 33-40,
for containing insoles.
42. Case for a stack of insoles comprising an opening for taking the insoles out of the
case, and a lid for reclosable closing of the opening, wherein the case preferably
has a toe side and a heel side, respectively, wherein the lid preferably is placed
at a toe side of the case, and wherein the case and/or the lid preferably comprise
a substantially airtight closure for closing the opening.
43. Use of a case according to claim 42 for containing insoles.