U.S. patent application number 10/985466 was filed with the patent office on 2005-06-09 for footwear.
Invention is credited to Andrew, Terence Sidney.
Application Number | 20050120591 10/985466 |
Document ID | / |
Family ID | 34436836 |
Filed Date | 2005-06-09 |
United States Patent
Application |
20050120591 |
Kind Code |
A1 |
Andrew, Terence Sidney |
June 9, 2005 |
Footwear
Abstract
The invention relates to a footwear sole component and to an
article of footwear 2 comprising such a sole component. A sole
component is suitably an insole 1 with toe and heel portions 30, 20
connected by an arch portion 40, the sole component being arranged
to form part of a sole of a closed article of footwear 2 having a
foot chamber 90. The sole component includes at least one
compressible passage 11 arranged, in use, to have an opening into a
first region of the foot chamber 90 and an opening into a second
region of the foot chamber 90 such that air can be caused to travel
from passage 11 into a second region of the foot chamber 90, by a
pumping effect caused by compression of the passage 11 along at
least a part of its extent during a stage of a wearers walking
cycle.
Inventors: |
Andrew, Terence Sidney;
(MacClesfield, GB) |
Correspondence
Address: |
ADAMS EVANS P.A.
2180 TWO WACHOVIA CENTER
CHARLOTTE
NC
28282
US
|
Family ID: |
34436836 |
Appl. No.: |
10/985466 |
Filed: |
November 10, 2004 |
Current U.S.
Class: |
36/29 ;
36/43 |
Current CPC
Class: |
A43B 7/081 20130101;
A43B 17/08 20130101; A43B 3/26 20130101 |
Class at
Publication: |
036/029 ;
036/043 |
International
Class: |
A43B 013/20 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 12, 2003 |
GB |
0326354.8 |
Nov 9, 2004 |
GB |
0424625.2 |
Claims
1. A footwear sole component comprising a toe portion and a heel
portion connected by an arch portion, the sole component being
arranged, in use, to form a part of a sole of a closed article of
footwear having a foot chamber, wherein the sole component
comprises at least one compressible passage extending between a
first portion of the sole component and a second portion of the
sole component, which passage is arranged, in use, to have a first
opening into a first region of the foot chamber and a second
opening into a second region of the foot chamber such that air can
be caused to travel from said passage into a second region of the
foot chamber, by a pumping effect caused by compression of the
passage along at least a part of its extent during a stage of a
wearers walking cycle.
2. A footwear sole component which comprises an insole having a toe
portion and a heel portion connected by an arch portion, the sole
component being arranged, in use, to form a part of a sole of a
closed article of footwear having a foot chamber, wherein the sole
component comprises at least one compressible passage extending
between a first portion of the sole component and a second portion
of the sole component, which passage is arranged, in use, to have a
first opening into a first region of the foot chamber and a second
opening into a second region of the foot chamber such that air can
be caused to travel from said passage into a second region of the
foot chamber, by a pumping effect caused by compression of the
passage along at least a part of its extent during a stage of a
wearers walking cycle.
3. A sole component according to claim 2, wherein the sole
component has a thickness of about 10 mm or less and can be cut to
size.
4. A sole component according to claim 2, wherein the sole
component is arranged such that, in use, air can be caused to
travel from the first region of the foot chamber to the second
region via at least one passage therein.
5. A sole component according to claim 2, wherein the first portion
of the sole component comprises a heel portion thereof and the
second portion of the sole component comprises a toe portion
thereof.
6. A sole component according to claim 2, wherein the sole
component comprises a plurality of passages.
7. A sole component according to claim 2, wherein said passage has
substantially the same cross section throughout its extent.
8. A sole component according to claim 2, wherein said passage is
arranged to be compressed by the weight of part of a wearer's foot
acting on the passage during a stage of the wearers walking
cycle.
9. A sole component according to claim 2, wherein said passage is
able to provide an active pumping action when compressed at any
point along its longitudinal extent.
10. A sole component according to claim 2, wherein said passage is
arranged, in use, to convey air to a second region of a foot
chamber by means of a peristaltic pumping action.
11. A sole component according to claim 2, wherein the sole
component does not comprise any pumping means in addition to the
one or more passages.
12. A closed article of footwear comprising an upper and a sole
forming a foot chamber therebetween wherein the sole comprises a
sole component comprising a toe portion and a heel portion
connected by an arch portion and comprises at least one
compressible passage extending between a first portion of the sole
component and a second portion of the sole component, which passage
is arranged to have a first opening into a first region of the foot
chamber and a second opening into a second region of the foot
chamber such that, in use, air can be caused to travel from said
passage into a second region of the foot chamber, by a pumping
effect caused by compression of the passage along at least a part
of its extent during a stage of a wearers walking cycle.
13. An article of footwear according to claim 11, wherein the sole
component comprises an insole.
14. A method of manufacturing a sole component according to claim
1, which method comprises forming a sole component by an extrusion
process.
15. A method of manufacturing an article of footwear according to
claim 11, which method comprises forming a sole component by an
extrusion process.
16. A kit of parts comprising: (i) two insoles according to claim
2; and (ii) instructions for cutting the insoles to each fit an
article of footwear of a specific standard size.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a footwear sole component,
particularly, though not exclusively, an insole for an article of
footwear and to an article of footwear comprising such a sole
component.
BACKGROUND OF THE INVENTION
[0002] There exist various types of footwear, including "closed"
footwear such as, for example, boots, shoes and trainers. Articles
of closed footwear have an upper lasted to a sole to form a foot
chamber arranged to accommodate a users foot.
[0003] The sole itself can be of a number of constructions but
always comprises an outer sole having an outer surface arranged to
contact the ground. In the most basic articles of footwear the
upper is lasted to this and a user's foot contacts an inner surface
of the outer sole. More normally an article of footwear further
comprises an insole arranged to sit between the outer sole and a
user's foot. Such an insole may be integrally formed with the
article of footwear or may be removable therefrom.
[0004] Articles of footwear may also comprise a mid sole interposed
between the insole and outer sole. Soles can thus have a sandwich
structure.
[0005] It is also known to provide underbeds (or undersoles) for
articles of footwear which can be inserted below an insole to
provide another layer to the sole structure.
[0006] Regardless of their specific sole construction, closed
articles of footwear provide a foot chamber which can be prone to
become hot and/or sweaty in use. This can be a particular problem
in hot environments, when a wearer exercises, or if the wearer is
prone to perspire excessively.
[0007] When a foot chamber becomes hot and/or sweaty it can create
several problems for a wearer. A wearer may experience discomfort
as a result of the heat and/or damp environment in which their foot
is accommodated. The conditions within the foot chamber may promote
bacterial and/or fungal activity and may result in increased
creation of malodours and/or skin infections. After use the
footwear may retain the malodours and this can be unpleasant for
those around the footwear.
[0008] Various attempts have been made to address the above
difficulties. For example, breathable materials have been employed
in the uppers of articles of footwear to improve the ventilation of
a wearer's foot and allow egress of perspiration from the foot
chamber.
[0009] Attempts have also been made to increase ventilation in the
foot chamber by supplying air from a point external of the foot
chamber into the foot chamber.
[0010] It is known from U.S. Pat. No. 4,547,978 to provide articles
of footwear having a plurality of cavities in the sole which can
contain air and are compressed when the sole contacts the ground to
pump air from the sole into the foot chamber. The cavities are
though formed in the outer sole and to enter the foot chamber air
must first pass through a porous insole. Additionally, although the
cavities are linked by channels in the outer sole these are open
and enclosed only by the porous insole, thus air may be
predominantly pumped into the foot chamber only in the immediate
vicinity of the cavities. The mechanism of ventilation also
requires the sole to be adapted specifically to comprise cavities
for the purpose of ventilation.
[0011] GB 2382017 discloses an under-foot layer which can be an
insole, footbed, or mid sole which comprises a plurality of air
flow channels arranged to convey air to a ball/toe portion from a
portion of the layer remote therefrom via a branched flow path.
However, the under-foot layer must have at least one channel which
is connectable to a pump located in the heel for causing conveyance
of the air. The pump can thus complicate the construction of an
article of footwear employing such an under-foot layer and
consequently employing the under-foot layer may be undesirably
costly.
[0012] The known approaches to tackling the difficulties associated
with ventilating foot chambers of closed articles of footwear have
not proved entirely satisfactory. Accordingly, the present
invention aims to address at least one disadvantage associated with
known articles of footwear whether discussed herein or
otherwise.
SUMMARY OF THE INVENTION
[0013] According to the present invention there is provided a
footwear sole component comprising a toe portion and a heel portion
connected by an arch portion, the sole component being arranged, in
use, to form a part of a sole of a closed article of footwear
having a foot chamber, wherein the sole component comprises at
least one compressible passage extending between a first portion of
the sole component and a second portion of the sole component,
which passage is arranged, in use, to have a first opening into a
first region of the foot chamber and a second opening into a second
region of the foot chamber such that air can be caused to travel
from said passage into a second region of the foot chamber, by a
pumping effect caused by compression of the passageway along at
least a part of its extent during a stage of a wearers walking
cycle.
[0014] Suitably, the sole component is arranged such that, in use,
air can be caused to travel from the first region of the foot
chamber to the second region via at least one passage therein.
[0015] The sole component may be provided as a component of an
article of footwear. The sole component may comprise a removable
component of an article of footwear. Alternatively, the sole
component may comprise an integral part of an article of
footwear.
[0016] Alternatively, the sole component may be provided as a
retro-fit component for a user to add to an article of footwear.
Suitably, the sole component can be employed in any type of shoe,
boot or trainer.
[0017] The sole component may comprise an insole. Suitably, the
insole comprises a removable insole. The insole may be transferable
between articles of footwear.
[0018] Alternatively, the sole component may comprise an underbed,
or a part of a midsole, arranged to lie immediately below an
insole.
[0019] Suitably, if the sole component comprises an underbed or
part of a midsole, an insole under which it lies will consist of a
thin flexible sheet member. Suitably, the insole will be porous
and/or have apertures to allow the first and second regions of the
foot chamber to be in communication with the openings of one or
more passages of the sole component.
[0020] Suitably, the sole component comprises a plurality of
passages. The sole component may comprise at least 3 passages,
preferably at least 5 passages, more preferably at least 20
passages, for example around 30 passages. Preferably, there is no
fluid communication between the passages along their extent. Each
passage may thus transport air independently of the others.
Suitably, one or more of said passages is resiliently
deformable.
[0021] Preferably, each passage is compressible. Preferably, a
plurality of passages are arranged, in use, to be compressed for at
least part of their extent during a stage of a wearer's walking
cycle. Each passage may be arranged, in use, to be compressed for
at least part of its extent during a stage of a wearers walking
cycle. Suitably, at least one of the or each passage is arranged to
be compressed by the weight of a part of a wearer's foot acting on
the passage during a stage of the wearers walking cycle.
Preferably, each passage is arranged to be compressed in this
manner.
[0022] Suitably each passage is resiliently deformable. Suitably
each passage is resiliently deformable and arranged, in use, to
serve as an active pumping means for causing conveyance of air
rather than as a passive conduit which simply carries air.
Suitably, the sole component consists essentially of resiliently
deformable passages and means, such as tube walls, defining said
passages.
[0023] Suitably, the sole component does not comprise any pumping
means in addition to the one or more passages. Suitably, the sole
component can be employed in an article of footwear which does not
comprise any additional pumping means. Suitably, the sole component
does not comprise any cavities or chambers in communication with
said passage or passages. Suitably, said passage or passages do not
comprise any enlarged portions which would serve as cavities or
chambers. The sole component may thus not rely on the compression
of a chamber or cavity to pump air in a bellows pump type action.
Instead, movement of air through the sole component may be caused
by progressive compression of passages of the sole component.
[0024] Suitably, the sole component does not contain valves.
[0025] Suitably, the first portion of the sole component comprises
the heel portion thereof. Preferably, the first portion comprises a
peripheral edge of the heel portion.
[0026] Suitably, the second portion of the sole component comprises
the toe portion thereof. Preferably, the second portion comprises a
peripheral edge of the toe portion.
[0027] Suitably, the first region of the foot chamber accommodates
the wearer's heel.
[0028] Suitably, the second region of the foot chamber accommodates
the wearer's toes.
[0029] Suitably, the sole component is arranged, in use, to suck
air in at the heel and transmit it to the toes. After expulsion
from the sole component at the toes the air may then travel over
the top of the foot toward the heel. The sole component may be such
that, in use, it substantially neither draws in air or expels air
from areas other than the heel and toe regions.
[0030] Suitably, at least one of the or each passage of the sole
component extends longitudinally, the longitudinal direction being
from heel to toe. Suitably, each passage of the sole component
extends longitudinally.
[0031] Suitably, at least one passage is arranged to be
compressible throughout its longitudinal extent. Preferably, each
passage is arranged to be compressible throughout its longitudinal
extent. The or each passage may thus be able to provide an active
pumping action when compressed at any point along its longitudinal
extent. Suitably, substantially any part of the sole component may
act as a pump independently of the rest. The sole component may
thus not require a force to be applied at a specific pump area to
produce a pumping effect. For example, even if a user walked only
on the balls of their feet there would still be a pumping
effect.
[0032] Suitably, one or more passages extend from the heel portion
to the toe portion. Suitably, one or more passages extend between
peripheral edges of the heel and toe portion.
[0033] Suitably, at least one passage has a cross-sectional area of
between 0.1 mm.sup.2 and 15 mm.sup.2, for example between 0.5
mm.sup.2 and 5 mm.sup.2. Suitably, each passage has a
cross-sectional area of between 0.1 mm.sup.2 and 15 mm.sup.2, for
example between 0.5 mm.sup.2 and 5 mm.sup.2. Preferably, the or
each passage has the same cross-sectional area throughout its
extent. The or each passage may comprise throated portions to
assist the expulsion of air there from. The passages may thus have
substantially the same cross-sectional area throughout their extent
except at said throated portions.
[0034] Suitably, the or each passage comprises an enclosed and open
ended conduit. Suitably, the conduit is formed from a substantially
gas impermeable and resiliently deformable material. Suitably, the
or each passage comprises a tube. The or each tube may comprise a
cylindrical tube. Preferably, the sole component comprises a
plurality of tubes. Preferably, the sole component comprises an
array of parallel passages which preferably comprise tubes.
Suitably, the sole component comprises a plurality of tubes lying
side by side. Suitably, the tubes are conjoined.
[0035] Suitably, at least one tube has an outer diameter of between
1 mm and 5 mm. Suitably, each tube has a diameter of between 1 mm
and 5 mm. Suitably, each tube has an outer diameter of around 3
mm.
[0036] Suitably, the or each tube has a wall thickness of between
0.25 mm and 1.6 mm.
[0037] Suitably, the sole component comprises a resiliently
deformable polymer. Suitably, the sole component comprises a
resiliently deformable rubber, plastics or thermoplastic rubber
material. Suitably, the or each tube comprises a resiliently
deformable rubber, plastics or thermoplastic rubber material. The
sole component may comprise silicone rubber. Alternatively, the
sole component may comprise PVC or natural rubber.
[0038] Each tube may be bonded to one or more adjacent tubes.
Adjacent tubes may be directly bonded to one another.
Alternatively, adjacent tubes may be joined by a bridging wall.
Alternatively, or in addition, the tubes may be mounted to a
backing sheet.
[0039] The tubes may be spaced apart to provide a gap into which
the tube walls can deform when the tubes are compressed in use. The
tubes may be mounted to a backing sheet in said spaced
relationship.
[0040] Suitably, adjacent tubes are joined by a bridging wall which
suitably holds the tubes in spaced relationship when they are
uncompressed. Suitably, a bridging wall connects adjacent tubes at
the tubes equators. The sole component may comprise a plurality of
bridging walls which may connect adjacent tubes at their equators.
Alternatively, the sole component may comprise a backing sheet
which comprises a single bridging wall connecting the tubes.
Suitably, the bridging wall or walls and tubes are formed
integrally. The bridging wall or walls and tubes may be formed by
extrusion.
[0041] Suitably, the tubes are spaced such that the axis of
adjacent tubes lie a distance of around .pi.d/2 from one another
(where d is the tube diameter). The sole component may thus be
compressible to a substantially flat form.
[0042] The tubes and backing sheet may be formed integrally, for
example by extrusion. Alternatively, the tubes may be adhered to a
backing sheet.
[0043] The sole component may comprise an insole and the backing
sheet may comprise a covering for the tubes arranged, in use, to be
interposed between the tubes and a user's foot. Suitably, the
covering comprises a cloth material. Alternatively, the covering
may comprise a leather material.
[0044] Alternatively, the sole component may comprise a first
(upper) and second (lower) sheet spaced apart by a plurality of
walls, said walls being arranged to define conduits between
themselves and the first and second sheets. The walls may be spaced
apart to provide a gap into which the walls can deform when the
sole component is compressed in use. The walls and first and second
sheets may be formed integrally, for example by extrusion.
[0045] The sole component may comprise an insole and a covering may
be provided for the first sheet and be arranged, in use, to be
interposed between the first sheet and a user's foot. Suitably, the
covering comprises a cloth material. Alternatively, the covering
may comprise a leather material.
[0046] Preferably, the or each passage is arranged, in use, to
convey air to a second region of a foot chamber by means of a
peristaltic pumping action.
[0047] Suitably, in use, when a wearer is walking and/or running
with a normal gait the portion of at least one passage in the heel
portion of the sole component is compressed as a wearers foot (in
the footwear) strikes the ground. As the wearer rocks their foot
forward to continue walking their weight may move along the sole
component toward the toe portion thereof. Accordingly, the portion
of the passage in the arch region and then subsequently the toe
region of the sole component may be compressed while the heel
portion of the passage and then subsequently the arch region of the
passage may expand to their former configuration.
[0048] Air in the passage in front of the compressed portion may
thus be forced along and out of the passage into the toe region of
the foot chamber.
[0049] As weight is moved along the sole component toward the toe
air may be drawn into and along the passage from the heel region of
the foot chamber.
[0050] Suitably, the sole component comprises an extruded
component.
[0051] Suitably, the sole component comprises an insole.
[0052] Suitably, the insole is arranged such that at least a part
of a peripheral edge of the heel portion does not abut the heel
part of the upper of an article of footwear in use. There may thus
be a clear airflow pathway between the upper and the peripheral
edge of the insole such that air can be drawn into an opening of
one or more passages in the insole from the heel region of the foot
chamber.
[0053] Suitably, the insole is arranged such that at least a part
of a peripheral edge of the toe portion does not abut the toe part
of the upper of an article of footwear in use. There may thus be a
clear airflow pathway between the upper and the peripheral edge of
the insole such that air can be expelled through an opening of one
or more passages in the insole into the toe region of the foot
chamber.
[0054] Suitably, the sole component is arranged such that when a
wearer is standing still, in use, the user's weight will be
supported substantially without the passages collapsing. Suitably,
the sole component is arranged such that passages will collapse, in
use, when a user walks. Suitably, the passages will collapse when a
user runs.
[0055] Suitably, the sole component is arranged to support a
pressure of at least 20 kPa, preferably at least 40 kPa, for
example at least 80 kPa, substantially without the passages
collapsing.
[0056] Suitably, the sole component is arranged such that the
passages substantially fully collapse when a pressure exerted
thereon exceeds 200 kPa, preferably when it exceeds 150 kPa, for
example when it exceeds 100 kPa.
[0057] Suitably, the sole component is arranged such that the
passages substantially fully collapse when subjected to a pressure
of between 40 kPa and 200 kPa.
[0058] The insole may be manufactured with a predetermined
configuration to allow it to fit within an article of footwear
having a particular size. The insole may be configured such that it
can be fitted into an article of footwear having a particular
standard size. A standard size might for example be a UK mens size
9 shoe.
[0059] The insole is suitably thin. The insole may have a thickness
of less than 10 mm, preferably less than 7 mm, for example of 5 mm
or less. Suitably, the insole has a thickness of between 3 and 5
mm. The insole may thus be suitable for fitting into substantially
any article of closed footwear without adversely affecting a
wearer's comfort. The insole may thus be suitable for use as a
retro-fit component.
[0060] The insole may be such that it can be cut to size. Suitably,
the insole when provided as a retro-fit component is configured
such that it can be cut to fit within an article of footwear having
a particular size within a predetermined range. Suitably, the
insole may fit within an article of footwear having the maximum
size in said predetermined range without cutting.
[0061] Suitably, the insole is provided with one or more markings
to indicate where it should be cut to provide a predetermined
configuration which will allow it to fit within an article of
footwear having a particular size. Preferably, the or each marking
indicates configurations which will allow the insole to be fitted
into an article of footwear having one of a number of particular
standard sizes. Suitably, markings indicate at least two
configurations to which the insole could be cut and each
configuration corresponds to a standard footwear size. Suitably,
the uncut insole corresponds to a standard footwear size. The
insole may thus be suitable for fitting into at least three
different standard sizes of footwear.
[0062] Suitably, the insole is provided with markings to indicate
where it should be cut to provide configurations which correspond
to at least 3 different standard sizes, more preferably at least 4,
for example at least 5.
[0063] The standard sizes may be determined by any one of a number
of known standards, for example they may be UK, US or continental
European standard sizes.
[0064] The insoles may be provided with markings corresponding to
mens sizes or womens sizes or both.
[0065] An insole may for example be configured such that it fits a
UK mens size 12 shoe without cutting and may be provided with
markings to indicate where it should be cut to provide a
configuration which fits within a UK mens size 11, 10, 9, 8 or 7
shoe.
[0066] An insole may for example be configured such that it fits a
UK ladies size 9 shoe without cutting and may be provided with
markings to indicate where it should be cut to provide a
configuration which fits within a UK ladies size 8, 7, 6, 5 or 4
shoe.
[0067] As an alternative to providing the insole with one or more
markings a template which can be employed to indicate where the
insole should be cut to provide a predetermined configuration which
will allow it to fit within an article of footwear having a
particular size may be provided. The template may be a paper
template. The template may be provided with one or more markings to
indicate where it should be cut to provide a predetermined
configuration in which its peripheral edge is such that it will fit
within an article of footwear having a particular size. The
template may then be held against the insole and the insole cut to
size using the template as a guide once a user is happy the
template is correctly sized.
[0068] According to a second aspect of the present invention there
is provided a closed article of footwear comprising an upper and a
sole forming a foot chamber therebetween wherein the sole comprises
a sole component comprising a toe portion and a heel portion
connected by an arch portion and comprises at least one
compressible passage extending between a first portion of the sole
component and a second portion of the sole component, which passage
is arranged to have a first opening into a first region of the foot
chamber and a second opening into a second region of the foot
chamber such that, in use, air can be caused to travel from said
passage into a second region of the foot chamber, by a pumping
effect caused by compression of the passageway along at least a
part of its extent during a stage of a wearers walking cycle.
[0069] Suitably, the sole component comprises a sole component
according to the first aspect. Suitably, the sole component
comprises an insole. Suitably, the insole is removable. Suitably,
the sole comprises an outer sole and a sole component comprising an
insole. Suitably, the sole further comprises a midsole. The article
of footwear may comprise a boot, shoe or trainer.
[0070] Suitably, in use, when a wearer is walking and/or running
with a normal gait the portion of at least one passage in the heel
portion of the sole component is compressed as a wearers foot (in
the footwear) strikes the ground. As the wearer rocks their foot
forward to continue walking their weight may move along the sole
component toward the toe portion thereof. Accordingly, the portion
of the passage in the arch region and then subsequently the toe
region of the sole component may be compressed while the heel
portion of the passage and then subsequently the arch region of the
passage may expand to their former configuration.
[0071] Air in the passage in front of the compressed portion may
thus be forced along and out of the passage into the toe region of
the foot chamber.
[0072] As weight is moved along the sole component toward the toe
air may be drawn into and along the passage from the heel region of
the foot chamber.
[0073] Shortly before a wearers foot leaves the ground, suitably
only the end of the toe region of the passage is compressed. When a
user's foot is removed from the ground the passage is suitably
fully uncompressed and may be filled with air. That air may be
almost entirely drawn from the heel region.
[0074] When a user's foot contacts the ground once again the
process may be repeated. Thus, cooler and/or dryer air from the
heel of the foot chamber may be effectively supplied to the toe
region to displace warmer and/or damper air therefrom.
[0075] Air from the toe region may circulate within the foot
chamber to the heel region and/or it may be expelled from the foot
chamber through a breathable upper of the footwear.
[0076] The air drawn into the sole component at the heel region of
the foot chamber may comprise air circulated to the heel region
from the foot region of the chamber. Suitably, such circulated air
may cool the foot during circulation to the heel region.
Alternatively, or in addition the air drawn into the sole component
at the heel region of the foot chamber may comprise fresh air drawn
into the foot chamber. The fresh air may be drawn into the foot
chamber through a breathable upper of the footwear. Alternatively,
or in addition, the fresh air may be drawn into the foot chamber
via a gap between a wearers heel and ankle and the upper of the
footwear.
[0077] Suitably, the circulation of air around the wearers foot and
in particular around the toes may reduce problems associated with
closed footwear and may improve a wearers comfort.
[0078] According to a third aspect there is provided a method of
manufacturing a sole component according to the first aspect.
[0079] Suitably the method comprises forming a sole component by an
extrusion process.
[0080] According to a fourth aspect there is provided a method of
manufacturing an article of footwear according to the second
aspect.
[0081] Suitably the method comprises forming a sole component by an
extrusion process.
[0082] According to a fifth aspect there is provided a kit of parts
comprising:
[0083] (i) two insoles; and
[0084] (ii) instructions for cutting the insoles to each fit an
article of footwear of a specific standard size wherein the insoles
are as described in the first aspect.
[0085] The kit may further comprise a template to be employed to
indicate where an insole should be cut to fit an article of
footwear of a specific standard size.
BRIEF DESCRIPTION OF THE DRAWING
[0086] The present invention will now be described by way of
example with reference to the accompanying drawings, in which:
[0087] FIG. 1 is a plan view of a sole component;
[0088] FIG. 2 is a plan view of a sole component showing hidden
detail;
[0089] FIG. 3 is a cross-sectional view along line A-A of FIG.
2;
[0090] FIG. 4 is a cross-sectional view along line B-B of FIG.
2;
[0091] FIG. 5 is a cross-sectional view of an alternative sole
component corresponding to the view along line A-A of FIG. 2;
[0092] FIG. 6 is a plan view of an article of footwear showing
hidden detail;
[0093] FIG. 7 is a cross-sectional view along line C-C of an
article of footwear;
[0094] FIGS. 8a-d show cross-sectional views of an article of
footwear along line C-C at various stages of a walking cycle.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0095] As illustrated by FIGS. 1 to 4 a first embodiment of a sole
component comprises an insole 1 arranged to fit within an article
of footwear 2.
[0096] The insole 1 comprises a plurality of silicone rubber tubes
10 having passageways 11 therethrough, arranged side by side and
bonded together. Most of the tubes 10 are arranged to extend
between a heel portion 20 and a toe portion 30 via an arch portion
40. Each of the passageways 11 of these has a first opening 21 at
the peripheral edge 22 of the heel portion 20 and a second opening
31 at the peripheral edge 32 of the toe portion 30. Owing to the
shape of the insole some tubes 10 and thus passageways 11 do not
extend from the heel portion 20 to the toe portion 30. Such tubes
can though still perform an active role as will be discussed
hereinafter.
[0097] In the illustrated example, the insole 10 is sized such that
it will fit a UK mens size 11 shoe. It is provided with markings
15, 16, 17 indicating where it should be cut to provide an insole
that will fit a UK mens size 10, 9 or 8 shoe.
[0098] The insole can be cut to shape using a pair of scissors.
[0099] In an alternative embodiment (not illustrated) the sole
component comprises an insole which comprises a plurality of
compressible tubes defining passageways. Adjacent tubes are spaced
apart from one another and the tubes are connected by bridging
walls. Otherwise the alternative embodiment may substantially
correspond to that of FIGS. 1 to 4.
[0100] Each bridging wall extends from the equator of one tube to
the equator of an adjacent tube. The insole is produced by
extrusion such that the bridging walls and tubes are integral. The
axis of adjacent tubes of the insole are spaced a distance of
.pi.d/2 from one another (where d is the tube diameter). The
separation between the tubes may provide greater space into which
the tubes may deform in use. The sole component may thus be
compressible to a substantially flat form.
[0101] As illustrated by FIG. 5 an alternative embodiment of the
sole component comprises an insole 1. The insole 1 is substantially
the same as that of the first embodiment in FIG. 2 but the
passageways 11 are not defined by tubes 10. Instead, the insole
comprises a first silicon rubber sheet 50 spaced from a second
silicon rubber sheet 60 by silicone rubber walls 70. The walls 70
extend in the heel to toe direction and separate the space between
the first and second sheets 50, 60 into a plurality of passageways
11.
[0102] In each of the embodiments the insole 1 is deformable such
that one or more of the passageways 11 can be compressed, in use,
by the weight of a user's foot.
[0103] FIG. 6 is a plan view of an article of footwear 2, namely a
shoe which shows the hidden detail of the outline of the inner face
81 of the upper 80 and the outline of the insole's peripheral edge
12. In the embodiment shown the insole 1 comprises a removable
insole as shown in FIG. 1.
[0104] As shown by FIGS. 6 and 7, the insole 1 is shaped such that
there is a space between the openings 21, 31 of the passageways 11
and the upper 80. Thus, there is a clear air flow path between a
heel region 91 of the foot chamber 90 (formed between the upper 80
and the sole 100) and the passageways 11 of the insole 1. There is
also a clear air flow path between a toe region 92 of the foot
chamber 90 and the passageways 11 of the insole 10.
[0105] The sole 100 comprises an outer sole 101, a midsole 102 and
the insole 1.
[0106] In use, one or more of the passageways is compressed by the
weight of a wearer's foot as they walk or run and air is expelled
from the compressed passageway(s) via openings 31 into the toe
region 92 of the foot chamber 90.
[0107] The intended operation, which is produced by a wearer having
a normal gait, is illustrated by FIGS. 8a to 8d.
[0108] As a wearer's foot 3 within the footwear 2 first engages the
ground 4 (FIG. 8a) the heel 103 contacts the ground 4. The heel
portion 20 of the insole 1 is thus compressed between the wearer's
heel and the midsole 102. One or more passageways (only one shown)
11 are thus compressed and air expelled therefrom as shown by arrow
D.
[0109] As the wearer carries on walking the ball 104 of the sole
100 contacts the ground (FIG. 8b). The user's weight shifts within
the footwear 2 such that the arch portion 40 of the insole 1 is
compressed expelling more air from the passage 11 as shown by arrow
D. As weight begins to lift off the heel portion 20 the passageways
11 in that portion return to their former configuration and air is
drawn in as shown by arrow E.
[0110] With continued walking as shown by FIG. 8c the user's weight
shifts such that the toe portion 30 of the insole 1 is compressed
expelling more air from the passageway 11 as shown by arrow D. The
portion of the insole 10 behind the area to which the weight of the
foot is applied expands and the passageways 11 in that portion
regain their former configuration and draw in more air as shown by
arrow E.
[0111] When the foot and footwear are moved through the position
shown by FIG. 8c the tubes in the toe region 30 which, due to the
insoles shape, extend from the peripheral edge 32 of the toe
portion only as far as the arch portion 40 and not to the heel
portion 20 (FIG. 2), also perform an active role. Air is expelled
from the tubes 10 passageways 11 via openings 31 and drawn into
them via openings 21.
[0112] When a user lifts their foot off the ground as shown by FIG.
8d the passageways 11 are fully expanded and filled with air.
[0113] Thus, when a user's foot next contacts the ground the
process is repeated.
[0114] The present invention may thus provide a sole component for
ventilating an article of footwear simply and reliably. It may also
provide a sole component which is economical and can be fitted to
existing footwear.
[0115] Attention is directed to all papers and documents which are
filed concurrently with or previous to this specification in
connection with this application and which are open to public
inspection with this specification, and the contents of all such
papers and documents are incorporated herein by reference.
[0116] All of the features disclosed in this specification
(including any accompanying claims, abstract and drawings), and/or
all of the steps of any method or process so disclosed, may be
combined in any combination, except combinations where at least
some of such features and/or steps are mutually exclusive.
[0117] Each feature disclosed in this specification (including any
accompanying claims, abstract and drawings) may be replaced by
alternative features serving the same, equivalent or similar
purpose, unless expressly stated otherwise. Thus, unless expressly
stated otherwise, each feature disclosed is one example only of a
generic series of equivalent or similar features.
[0118] The invention is not restricted to the details of the
foregoing embodiment(s). The invention extends to any novel one, or
any novel combination, of the features disclosed in this
specification (including any accompanying claims, abstract and
drawings), or to any novel one, or any novel combination, of the
steps of any method or process so disclosed.
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