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CA1084260A - Improved shoe sole containing discrete air-chambers - Google Patents

Improved shoe sole containing discrete air-chambers

Info

Publication number
CA1084260A
CA1084260A CA 301423 CA301423A CA1084260A CA 1084260 A CA1084260 A CA 1084260A CA 301423 CA301423 CA 301423 CA 301423 A CA301423 A CA 301423A CA 1084260 A CA1084260 A CA 1084260A
Authority
CA
Grant status
Grant
Patent type
Prior art keywords
sole
member
air
mid
shoe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA 301423
Other languages
French (fr)
Inventor
Jean-Pierre Vermeulen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VERMEULEN JEAN PIERRE
Original Assignee
VERMEULEN JEAN PIERRE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Classifications

    • AHUMAN NECESSITIES
    • A43FOOTWEAR
    • A43BCHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00Soles; Sole and heel units
    • A43B13/14Soles; Sole and heel units characterised by the constructive form
    • A43B13/18Resilient soles
    • A43B13/20Pneumatic soles filled with a compressible fluid, e.g. air, gas

Abstract

ABSTRACT OF THE DISCLOSURE

This invention relates to a new shoe and in particular, to a novel sole suitable for use in an athletic shoe. The sole of the shoe includes a plurality of alveoli or air-chambers which may be of different shapes and which provides sufficient flexibility and resiliency to the shoe to reduce the common injuries suffered by athletes. The sole distributes the stress and weight created when the foot of a runner contacts the ground and forces the foot to gently pronate. By relieving this pressure, such problems as tendonitis, fallen arches, wobbling, knee injuries, cartilage damage have been remarkably reduced.
A wedge-shaped arch support is also provided to provide support for the athlete's foot.

Description

2~

BACKGROUND OF T~IE INVENTION
1. Field of the Invention This inven-tion relates generally to shoes and more particularly, to a sole which is suitable for use in an athletic shoe for use by runners, joggers and the like.
2. Description of the Prior Art One of the problems encountered by runners, joggers, walkers and other athletes (hereinafter for brevity, referred to as xunners) is the lack of a shoe and in par-ticular, a shoe containing a sole which is designed and manufactured to meet and compensate for the problems associated with the physical act of running.
Many injuries encountered in the various activities which involve running or walking are directly attributable to the foot~7ear worn by the runner. Examples of these injuries include tendonitis, fallen arches, damaged knees, etc. They occur primarily because the footwear worn does not compensate for the stress which is applied to ~arious parts of the foot during the ~- running activity, stiff~ess`in the footwear and the lack of flexibility and stability in the sole o~ the footwear worn.
.. ;,, .
i In those shoes which have attempted to overcome these . .
problems, a further problem has arisen which is that these shoes wear out very quickly and must be discarded after a short period of use, thereby increasing tremendously the participatory costs o~
. ~, . . .
the activity incurred by the participant.
Canadian patent 377,764 issued on November 15, 1938 to Arthur Fisch shows an early attempt to compensate for problems encountered by users of these types of footwear. While this ~ :;
patent relates particularly to "house shoes" and not directly to ~; 30 athletic footwear, it attempts to provide a shoe which allows for ''' ~' ' .
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1 the natural unro:Lling of the foot from heel to toe by using a series of studs or projec-tions underneath the arch support and a plurality of arch supporting ribs and a series of web forming cells underneath the toe portions. While this structure improves the resiliency of the shoe, it does not provide su~ficient support and resiliency for use by runners. Also, the shoe provides no means to pxevent pronation which may occur during running or similar activities.
U.S. patent 2,090,881 granted to Wilson on August 24, 1937 provides a cushioning member for use as an insole or an out-sole to retain the resiliency o the shoe and to ease the pressure created when the shoe contacts the ground. A plurality of individual air-filled cells are used as the cushioning mechanism with each cell sealed.
While this shoe increases the cushioning effect of a shoe, it does not prevent pronation of the foot which is the cause of many injuries.

Similarly, the shoe disclosed in U.S. patent 2,553,616 ; . . ~: ~
granted to Walls on May 22, 1951 addresses itself to some of the problems encountered by runners but provides no solution to prevent rapid pronation.

. .
; These foregoing examples and other sole s~stems used in the prior art utilize a plurality o inclined 1at layers of different material such as gums, rubbers, elastics and other synthetic materials to create an elevation of the sole of approximately one inch at the heel portion oP the shoe ~hich gradually decreases towards the toe portion of the sole.

SUMMARY OF THE INVENTION
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Accordingly, it is an object of the present invention to at least partially overcome these disadvantages by providing '' ' ~

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26~9 1 a novel sole and a shoe utilizing this sole which reduces the injuries suff~red by runners durin~ the performance o~ athlekic activities yet provides the required flexibility and resiliency in the shoe.
It is a ~urther object of this invention to provide a sole and a shoe utilizing the sole which has the necessary durability to withstand normal use by an athlete.
It is a still further object of the present invention ;~ to provide a sole which will distri~ute the stress and weight created when the foot of a runner contacts the ground, more evenly over the entire sole to reduce the stress and strain on particularly vulnerable places in the leg and ankle of the runner.
To this end, in one o~ its objects, the invention provides a sole for use in a shoe, said sole comprising:
(a) a base member;
tb) a mid-sole containing a plurality of alveoli;
:,, tc) an air-chamber member comprising a thin, resilient ~; ~ member adapted to seal said alveoli thereby pro-;~ 20 viding a plurality oE sealed air-chambers in said sole;
(d) an upper sealing member adapted to ~verlap said air-chamber member.
In another of its aspects, the invention further provides a one-piece sole for use in an athletic shoe which comprises:
(a) a base member carrying on its underneath surEace, a plurality of ground gripping studs;
; (b) a thin, lower sealing member;

~- 30 (c) a mid-sole containing a plurality o~ alveoli :"
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1 extendincJ from the -top surEace o~ said mid-sole downwardly to a point marginally above the bottom surface oE said mid-sole, the height of said mid-sole gr~ater at -the heel port.ion than at the toe por-tion; and the concentra-tion oE sa.id alveoli greater in the por-tion of the mid-sole corresponding to the ball and plant o~ the foot and the lateral side of said mid-sole;
(d) an air-chamber member comprising a thin, resilient member with a plurality of downwardly depending, open-topp~d air-: chambexs, said air-chambers corresponding in size, shape and ::
10 position to said alveoli in said mid-sole; ~ ~
. (e) an upper sealing member adjusted to overlay said ~;`
air-chamber member and to seal said air-chambers.
In still another of its aspects, the invention provides an improved shoe which consists of an upper portion and a sole portion, one improvement comprising:
(a) a base me~er carrying on its underneath surface, a plurality of ground gripping studs;
tb) a thin, lower sealing member;
(c) a mid-sole containing a plurality of alveoli .
extending from the top surface of said mid-sole downwardly to a point marginally above the bottom surface of said mid-sole, the height of said mid-sole greater at the heel portion than at the toe portion; and the concentration of said alveoli greater in ~ the portion of the mid-sole corresponding to the ball and plant of the foot and the lateral side of said mid-sole;
. (d) an air-chamber member comprising a thin, resilient . member with a plurality o~ downwardly depending, open-topped air-chambers, said air-chambers corresponding in size, shape and . position to said alveoli in said mid-sole;
. 30 (e) an upper sealing member adjusted to overlay said air-chamber member.and to seal said air-chambers;
.

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1 and a wedcJe inser-ted in said shoe on the top of said upper sealing member of said sole,said wedge consisting oE
a we~ge-shaped arch support for use in a shoe which comprises a .raised area corresponding to the heel of the foot, the lateral portion of the wedge descreasing in height from the heel to the toe and the medial portion sloping marginally from the heel forward to the ball portion o~ the foot then convexly downward to the toe.
In yet another of its aspects, the invention further , 10 provides a wedge-shaped arch support for use in a shoe which comprises a round area corresponding to the;~.heel of the foot, ~ the lateral portion of the wedge decreasing in height from the .~ heel to the toe and the medial portion sloping maryinally from `;., the heel ~orward to the ball portion of the foot then convexly downward to the toe.
BRIEF DESCRIPTION OF THE DRAWINGS
.I Further objects and advantages of the invention will appear from the description taken together with the accompanyin~
: drawings in which:

FIGURE 1 is an underneath view showing a foot inside -the outline of the sole of a shoe;
; . FIGURE 2 is an exploded view of the component layers of one embodiment o~ the invention;
FIGURE 3 is a top view of the mid-sole of the sole . shown in Figure 2. Fig. 3 appears on the same page as Fig. l;
FIGURE 4 is a sectional side view of the assembled sole system of Figure 2;
FIGURE 5 is an exploded side view of a second :~ embodiment of the present invention;

FIGURE 6 is a side view of a third embodiment of the .~, , .

:

~' micl-sole of the present inven-tion.
F~GUR~ 7 is a top view of a fourth embodiment of the mid-sole;
FIGURE 8 is a side view of a fifth embodiment of the sole of the present invention;
FIGURE 9 is a rear perspective view showing the heel of the shoe an~ ~he wedge of the present invention;
FIGVRE 10 is a side view of the wedge along line X - X of Figure 9;

FIGURE 11 is a rear view of the wedge and protector of the present invention.
DESCRIPTION OF THE_PREFERRED EMBODIMENT
In order to best unaerstand the present invention and the manner in which it alleviates the problems caused by running, an explanation of these problems and resulting injuries encountered by runners, joggers and the like will be made first.
The problems encountered by runners are many and most result from an unnatural pressure applied to the foot or leg during the act of running. As the foot is placed on the ground, 2~ it is forced to quickly turn unnaturally thereby placing strain on the tendons in the ankle and leg which eventually results ;~ in tendonitis. Most shoes on the market do not have the required flexibility and support to prevent this from occurriny and those that do are so soft and flexible that they wear out too quickly.
In order to achieve this flexibility, some manufacturers will use a very soft material such as foam or a synthetic foam rubber. However, these materials are too soft and wear out very quickly. If -the material is too soft, in addition to wearing out, blisters will occur very rapidly on the runner's feet and the lack of support in the shoe wil1 cause the foot to "wobblo". If ' ' ' ~

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1 on the other handr the shoe i5 too hard, the stress applied to the feet of the ~unner is intensified causing serious damage.
The manner in which a runner lands on his feet differs with a variance in the speed at which he is travilling. If a person is running a mile in about 7 to 10 minutes, that is, when he is jogging, he will usually land very hard on the heel part of the foot. If he is running a faster mile, say in about five to seven minutes, the runner will usually land on the plant or ball portion of the foot.

`~ 10 When th~ runner lands on his foot, the foot will turn over from the lateral to the meaial side. There is little or no flexlbility in this movement and this "turning" of the foot is called "pronation". When a runner lands on the medial side and rota~es or turns over to the lateral side, this is referred to as "supination".
' The runner in the normal running position pronates as he lands and if t~ere is nc flexibility, this forces the foot to land flat on the ball portion. The stress and weight is therefore applied to the arch portion of the foot which may eventually result in collapsed or fallen arches.
The object and design of the shoe of the present invenkion is to allow the foot to pronate slowly to relieve the stress and pressure created by rapid pronation. When a runner slowly pronates as the foot contacts the ground, the stress and weight is removed from the leg and such problems as knee injuries, shin splints, fallen or collapsed arches, achilles tendonitis and cartilage damage are remarkedly reduced.
' The present invention uses an air suspension system ' in the sole to reduce the effects o~ the i~pact of the foot on the ground and to preven. or reduce rapid pronation.

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1 Howev~r, i-t mus-t be remembere~ that supinatîon is equally as detrimental as rapid pronation. The prona-tion must now be slow enouyh to allow a natural r supported rolling action of the foot to avoid the use of the tendons in the ankle and leg.
The sole of the present invention may be of different embodiments to produce the desired air suspension system. Several of these embodiments are shown in the drawings to which reference is now made.
In the first embodiment shown in Figure 2 of the drawings, the sole (from the bottom upwards) consists of a base member 10 which ac~s as the ground contacting surface. The base member 10 may be of the same size as the rest of the shoe or may be of larger dimensions shown in dotted lines in Figure 2. The base member 10 may also carry on its underneath surface, a plurality of ground grippiny studs 14 which may be of any design well-known in the art.
Placed above the base member 10, is a lower sealing member 16. This lower sealing member may be of an~ desired thick-ness, and preferably is about 1 mm thlck. If desired, this 20 member 16 may be constructed as a pad to provide increased 0 resiliency to the sole. The pad may be made of a microcellular . , .
synthetic foam to provide additional protection for the runner.
The lower sealing member 16 may be omitted within the scope of the invention. In addition to its function to seal the lower portion of the side, this member also adds resilienc~ to the sole and reduces the wear on the mid-sole 18.
However, this member may be omitted to reduce the weight of the shoe and its cost of manufacture, if desired.
After the lower sealing member 16, is placed 30 the mid-sole 18 of the shoe of the embodiment of the present - 8 - `

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1 invention. The mid-sole 1~ consists oE a solid portion 24 and a plurality of alveoli 26 which extend ~rom the top surface 28 to a point marginally above the bot~om surface 30 of the mid-sole 18.
The mid-sole 18 of the shoe is the base supporting structure of the sole. It must be resilient yet flexible enough to allow for the normal bending action of any sole during the running activity. ~ny suitable material may be used and an example thereof is resilient foam rubber.

The purpose of the mid-sole 18 is to provide an integrated air-suspension arch support for the shoe. The alveoli are provided to accommodate the air-chambers 32 ~as explained hereinafter) and the shape of the mid-sole provides additional sup-port for the foot. It increases in height from front to back as shown in Figure 2 to xelieve the stress and pressure applied to the arch of the foot during running.
The next layer is an air-chamber member 20 which carxies a plurality of air-chambers 32 extending downwardly from the lower surface 31. These air-chambers 32 correspond to and are ,~ .
complimentary to the aIveoli 26 in the mid-sole 18 and when .f~ . .
assembled, fit within the alveoli 26.
The shape of the alveoli and the chambers are not restricted to any particular shape as long as they are complement-ary to each other. The inventor has found that to simplify manufacture of the sole, either a cylindrical or a rectangular (or square) shape is suitable and preferably the square shape is used. The spacing between the chambers or the alveoli may also vary, but preferably r is from 2 to 4 mm.
The depth of the air-chamber member 20 is variable 30 within the scope of ~his invention and preferably is about one- ~ -half a millimetre in thickness. As noted before, the size, shape -, - g _ ' 1 and positioning of the air-chambers 32 may be varied provided that the air-chambers 32 and the alveoli correspond and are complementary to each other.
The depth o~ the air-chambers and the alveoli decrease towards the front of the sole as the depth of the mid-sole decreases as shown in Figure 2. In one embodiment, the air--chambers were two cm in depth at the heel portion and decreased to one cm at the toe portion of the sole. However, the diameter of the air-chambers should remain constant to provide the necessary 1 o effect.
On the top of the air-chamber member 20 which carries the air- chambers 32, is a second sealing member 22 which acts to seal the air-chambers 32.
The alveoli 26 extend substantially the height o~ the mid-sole 18. Their height may be varied according to the desired height of the mid-sole 18 but in the preferred embodiment, are ~-approximately 2 centimetres in height at the rear and 1 cm at the toe portion, as described hereinbefore. They are distributed about the surface of the mid-sole 18 and as shown in Figure 3, are more numerous in the area of the sole underneath the ball areà
of the foot 36 and extending rearwardly on the lateral side 37 of the sole member. The alveoli 26 are less dense on the heel portion 40 and may or may not be found on the toe portion 42.
The mid-sole 18 and the other layers of the system may be manufactured of any rubber or rubberized material which is ;~
well known in the art.
To assemble the various components of the sole, any - `~ -suitable process may be used and each layer may be easily -~
vulcanized and secured to the immediately adjacent layers in a simple and mechanical process.
.,~ ' ' '`''. ~ ~, Z6~ , 1 When ass~mbled as show~ in Figure ~, the sole of the present invention acts as a type of shock absorber which absorbs the shock as the fQot of -the runner contacts the ground. As pressure is applied, the air within the sealed cha~bers 32 contracts and distributes the pressure throughout the entire sole.
The combination oE the air-chambers and the resilient material absorbs the impact and allows the foot to roll or to gently pronate.
A second embodiment of the present invention is shown in Figur~ 5. This embodiment includes a base member 54 which may carry ground gripping studs 56 on its underneath surface, an optional lower sealing member 58 to provide additional resiliency, mid-sole 52 and air-chamber member 50. In this embodiment, the alveoli 60 are formed by opposite and complementary semi-circular - depressions set in the upper surface of the mid-sole 52 and in the lower surface of the air~chamber member 50. These two members are sealed together to form the alveoli to trap air therein. The shape of the depressions should preferably be semi-circular to provide the necessary support and prevent collapse of the structure.
Another embodiment is shown in Figure 6 of the drawings.
In this embodiment, the alveoli 62 of the mid-sole 66 and the air-chambers 64 of the air-chamber member 68 àre off-set so that when placed together each alveoli is adjacent the complementary air-chamber. When sealed together, the mid-sole 66 and the air-chamber member 68 effectively seal the alveoli 62 and the air-chambers 64 to form a plurality of chambers containing trapped air. This construction also provides good resiliency and is very light-weight.
A further embodiment of the invention is shown in Figure 7 which shows a different shape of the air-chambers. In -- 11 -- .

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1 this embodiment, the shape of the alveoLi 70 are rectangular with rounded ends Oll the lateral and medial sides of the shoe and circular 72 at the heel por-tion and the ball and plant portions of the foot.
A s-till further embodiment is shown in Figure 8 of the drawings. The inventor has ~ound that a sole having good resili-ency and shock absorption may also be made wherein the alveoli are formed by a plurality of tunnel-like passages 74 formed laterally through the sole. In this case, the mid~sole and the air-chamber 10 member are a single unit and the passages are formed laterally through the entire sole. The sole may be made of normal rubber stock or polyvinyl chloride and a particular advantage is the reduced weight of the sole which is particularly advantageous for runners. The shape of the passages is not restricted to cylindrical, and , may be of any desired shape.
To further relieve the pressure applied to the arches of the foot, the present inventor has invented an arch suppoxt or wedge which when used with the sole, reduces and in many cases, eliminates the problem o~ fallen arches in runners.
As shown in Figure 10(in side view)~ the arch support or wedge includes a raised area 44 which is built up on the upper sealing member 22 across the heel portion 40 of the shoe. Just in ~i front of the heel portion 40 of the shoe, the outside or lateral portion 46 of the wedge decreases in height in a straight line to the ball of the foot 36 as shown in Figure 9. On the other hand, the inside or medial line 48 follows a sloping line forward for about one-half the length of the shoe,then convexly downwards shown in Figure 10.
-; The top surface of the wedge is gently sloped downward -from the heel to toe portion of the shoe and also from the lateral to medial sides. By supporting the arch in this manner, the foot of the runner is forced to gently pronate when contac*ing the , :

1 grouncl durincJ runninc3. The build-up of the arch support or wedge at the heel may be of any desired heightl although from about 1 to 4 mm has proven ef:~ective and results have been achieved with a build-up of about 4 mm.
The support or wedge used in the present invention differs from the wedges used in the prior art in that its height at the heel is the same on both sides of the sole. Just in - front of the heel, the outside or la~eral portion 46 descends in a straight line to the ball of the foot whereas the inside or ~` 10 medial line 48 follows a sloping line forward for about hal~ the length of the shoe, then convexly downwards as the wedge of the prior art.
This wedge may be supplied together with or indepen-dently of the sole and shoe. Since each foot may differ in its actual construction, it is important to fit the wedge properly in the shoe a~d minor variations may be made in the design to accommodate each individual's ~oot.
In the drawings of the present application, the dimensions of various components have been exaggerated to show ~o the invention and its embodiments. These drawings are merely - exemplary and the invention is not restricted to the particular ;- designs as shown.
Although the disclosure describes and illustrates a preferred embodiment of the invention, it is to be understood the inve~tion is not restricted to this particular embodiment.

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Claims (14)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A sole for use in a shoe, said sole comprising:
(a) a base member;
(b) a mid-sole containing a plurality of discrete, vertically-aligned alveoli;
(c) and air-chamber member comprising a thin, resilient member adapted to seal said discrete, vertically-aligned alveoli thereby providing a plurality of discrete, vertically-aligned sealed air-chambers in said sole;
(d) an upper sealing member adapted to overlay said air-chamber member.
2. A sole for use in a shoe as claimed in claim 1, wherein said mid-sole contains a plurality of discrete, vertically-aligned alveoli extending from the top surface of said mid-sole downwardly to a point marginally above the bottom surface of said mid-sole;
and said air-chamber member comprises a thin, resilient member with a plurality of downwardly depending, open-topped discrete air-chambers, said air-chambers corresponding in size, shape and position to the alveoli in said mid-sole.
3. A sole as claimed in claim 1 or 2 wherein said base member carries on its underneath surface, a plurality of ground gripping studs.
4. A sole as claimed in claim 2 further including a lower sealing member which is about 1 mm in thickness, said lower sealing member between said base member and said mid-sole.
5. A sole as claimed in claim 2 wherein said mid-sole has a greater height at its rear portion then at its front portion.
6. A sole as claimed in claim 2 wherein the concentration of alveoli in said mid-sole is greater in the portion of the mid-sole corresponding to the ball and plant of the foot and the lateral side of said mid-sole.
7. A sole as claimed in claim 6 wherein said alveoli are cylindrical or rectangular.
8. A sole as claimed in claim 6 wherein said alveoli are square.
9. A sole as claimed in claim 6 wherein the depth of said alveoli increases from the front to the rear of said mid-sole.
10. A sole as claimed in claim 2 which is manufactured from rubber and each layer is vulcanized to the immediately adjacent layers.
11. A one-piece sole for use in an athletic shoe which comprises:
(a) a base member carrying on its underneath surface, a plurality of ground gripping studs;
(b) a thin, lower sealing member;
(c) a mid-sole containing a plurality of discrete, verti-cally-aligned alveoli extending from the top surface of said mid-sole downwardly to a point marginally above the bottom surface of said mid-sole, the height of the said mid-sole greater at the heel portion than at the toe portion; and the concentration of said alveoli greater in the portion of the mid-sole corresponding to the ball and plant of the foot and the lateral side of said mid-sole;
(d) an air-chamber member comprising a thin, resilient member with a plurality of downwardly depending, open-topped discrete air-chambers, said air-chamber corresponding in size,
Claim 11 continued:
shape and position to said alveoli in said mid-sole;
(c) an upper sealing member adjusted to overlay said air-chamber member and to seal said air-chamber.
12. In a shoe comprising an upper portion and a sole portion, the improvement comprising the sole consisting of a one-piece sole for use in an athletic shoe which comprises:
(a) a base member carrying on its underneath surface, a plurality of ground gripping studs;
(b) a thin, lower sealing member;
(c) a mid-sole containing a plurality of discrete, verti-cally-aligned alveoli extending from the top surface of said mid-sole downwardly to a point marginally above the bottom surface of said mid-sole, the height of said mid-sole greater at the heel portion that at the toe portion; and the concentration of said alveoli greater in the portion of the mid-sole corresponding to the ball and plant of the foot and the lateral side of said mid-sole;
(d) an air-chamber member comprising a thin, resilient member with a plurality of downwardly depending, open-topped discrete air-chambers, said air-chambers corresponding in size, shape and position to said alveoli in said mid-sole;
(e) an upper sealing member adjusted to overlay said air-chamber member and to seal said air-chambers;
and a wedge inserted in said shoe on the top of said upper sealing member of said sole, said wedge consisting of a wedge-shaped arch support for use in a shoe which comprises a raised area corresponding to the heel of the foot, the lateral portion of the wedge decreasing in height from the heel to the toe and the medial portion sloping marginally from the heel forward to the ball portion of the foot then convexly downward to the toe.
13. A sole for use in a shoe as claimed in claim 1 wherein said mid-sole includes a plurality of semi-circular depressions on its upper surface and said air-chamber member includes a plurality of identical and complementary semi-circular depressions on its lower surface, said plurality of depressions forming said plurality of discrete, vertically-aligned sealed air-chamber when said mid-sole and said air-chamber are sealed together.
14. A sole for use in a shoe as claimed in claim 1 wherein said air-chamber member further includes a plurality of alveoli depending downwardly from its lower surface, each of the alveoli of the air-chamber member off-set with a corresponding alveoli of the mid-sole and adapted to form a continuous series of alternate discrete sealed air-chambers when said mid-sole and said air-chamber member are sealed together.
CA 301423 1978-04-12 1978-04-12 Improved shoe sole containing discrete air-chambers Expired CA1084260A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 301423 CA1084260A (en) 1978-04-12 1978-04-12 Improved shoe sole containing discrete air-chambers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA 301423 CA1084260A (en) 1978-04-12 1978-04-12 Improved shoe sole containing discrete air-chambers
US05896739 US4223455A (en) 1978-04-12 1978-04-17 Shoe sole containing discrete air-chambers

Publications (1)

Publication Number Publication Date
CA1084260A true CA1084260A (en) 1980-08-26

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US (1) US4223455A (en)
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