JP2020054474A - Sole for artificial leg - Google Patents

Abstract

To provide a sole for an artificial leg allowing a user to expect improvement of performance.SOLUTION: A sole for an artificial leg to be used by attachment to a ground contact surface of an artificial leg includes a sole main body 1 having an out sole A where multiple spike pins 3 are arranged by projection. A thickness including a projection height of the spike pin in an inner part of a toe area in the sole main body is allowed to be gradually thinner toward an inner edge, and also a thickness including a projection height of the spike pin in an outer part of a toe area in the sole main body is allowed to be nearly fixed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a prosthetic sole used by attaching to a prosthetic foot.

A prosthetic sole with a spike pin is attached to the tip of a prosthetic foot mainly used in competitions.
For example, Patent Literature 1 discloses a leaf spring-like artificial prosthesis having a spike sole attached to the back surface.

JP-A-2006-150189

By the way, it is desired that a prosthesis to which a prosthesis sole is attached can exhibit excellent performance. In particular, for a prosthetic leg for competition, one that can exhibit excellent performance in order to obtain better results is desired.
Patent Literature 1 discloses a rubber sole that covers an outsole with spikes in detail, but does not disclose a prosthetic sole that can improve the performance of a user.

  An object of the present invention is to provide a prosthetic foot sole that can be expected to improve the performance of a user.

The present inventors have analyzed the operation of a prosthetic limb user in order to obtain a prosthetic limb in which the user can exhibit excellent performance. In the test, using a prosthesis with an outsole with spikes, we asked the actual athlete to cooperate and examined and analyzed the behavior of the athlete from the start of running to the sprinting state.
As a result, at the start of traveling (first to third steps), only a narrow range of the toes area of the outsole is in contact with the ground, and particularly at the start, the moment the vehicle contacts the ground, Until the moment you leave, you've been found to be in contact with the ground, biased inside the toes of the outsole. In addition, it has been found that, during sprinting, a posture in which a portion corresponding to a portion below the knee is depressed inward can run faster.
From the test results specific to such prostheses, increasing the grip force inside the toe area of the prosthetic outsole will improve the performance at the start, and if the posture below the knee is leaned inward, the sprinting Performance is expected to improve.
Based on such knowledge, the present inventors have completed the present invention.

  A first prosthetic sole according to the present invention is a prosthetic sole used by being attached to a grounding surface of a prosthesis, the sole sole including an outsole provided with a plurality of spike pins projecting therefrom; The thickness of the inner portion of the toe region including the height of the protrusion of the spike pin is gradually reduced toward the inner edge, and the height of the protrusion of the spike pin in the outer portion of the toe region of the sole body is reduced. The included thickness is configured to be substantially constant.

In a preferred prosthetic sole of the present invention, the sole body further includes an intermediate sole interposed between the outsole and a ground contact surface of the prosthesis, and a thickness of an inner portion of a toe region of the intermediate sole is formed on an inner edge. It is configured so that it becomes smaller gradually as it goes.
A preferred prosthetic sole according to the present invention is configured such that the thickness of the inner portion of the toe region of the intermediate sole gradually decreases toward the tip inner edge.
In a preferred prosthetic foot sole according to the present invention, among the spike pins, a spike pin disposed at the most distal end side of the outsole is projected so as to be inclined toward a leading edge of the outsole.
In a preferred prosthetic foot sole according to the present invention, an installation ratio of the spike pins per unit area in an inner portion of the toe region is larger than an installation ratio of the spike pins in an outer portion of the toe region per unit area.
In a preferred prosthetic foot sole according to the present invention, the outsole has a toe region and an intermediate region continuous with the toe region, and the outsole projects so that an inner edge of the toe region satisfies a relationship of X> Y. Having a part that is.
However, X is the length between the inner edge of the toe area and the width direction center line of the halfway area, and Y is the length between the outer edge of the toe area and the width direction center line of the halfway area. Refers to the length.
In a preferred prosthetic foot sole of the present invention, an inner edge of a toe region of the outsole extends substantially linearly in a vertical direction in plan view between a first portion and an inner edge of the first portion and the intermediate portion. A second portion extending inclining with respect to the longitudinal direction.
The sole for a prosthetic foot of the present invention, wherein the sole body further includes an intermediate sole interposed between the outsole and a grounding surface of the artificial leg, and a toe region of the intermediate sole is joined to the back sole to the outsole. And a surface joined to the grounding surface of the prosthesis, wherein the back surface has a larger area than the front surface.

A second prosthetic sole according to the present invention is a prosthetic sole attached to a grounding surface of a prosthesis, the sole having a sole body including an outsole provided with a plurality of spike pins, wherein the outsole is , A toe region, and an intermediate region that is continuous with the toe region, and has a portion in which an inner edge of the toe region protrudes so as to satisfy the relationship of X> Y.
However, X is the length between the inner edge of the toe area and the width direction center line of the halfway area, and Y is the length between the outer edge of the toe area and the width direction center line of the halfway area. Refers to the length.

The prosthetic sole according to the present invention ran using this prosthetic sole, because the thickness of the sole body including the protruding height of the spike pin in the inner part of the toe region became gradually smaller toward the inner edge. At this time, the user takes a posture in which a portion corresponding to the user's knees leans inward. For this reason, the use of the prosthetic sole of the present invention can be expected to improve performance during sprinting.
In addition, since the prosthetic sole of the present invention has a portion in which the inner edge of the toe region of the outsole is protruded, when traveling using the prosthetic sole, the contact area is biased inward and increases. , The grip power increases. For this reason, if the sole for a prosthesis of the present invention is used, improvement in performance at the start of running can be expected.

The top view which looked at the out sole of the sole for artificial legs of the present invention from the grounding surface side. FIG. 2 is a right side view of the outsole (a side view as viewed from the direction of arrow II in FIG. 1). FIG. 3 is a top view of the outsole (a side view as viewed from the direction of arrow III in FIG. 1). The partially omitted enlarged plan view of the outsole. 1. The enlarged sectional view cut | disconnected by the VV line of FIG. FIG. 2 is an enlarged sectional view taken along line VI-VI in FIG. 1. The top view which looked at the intermediate sole of the sole for artificial legs of the present invention from the grounding surface side. The top view which looked at the intermediate sole from the side opposite to the grounding surface. The right side view of the middle sole. The top view of the same intermediate sole. FIG. 8 is an enlarged cross-sectional view taken along line XI-XI in FIG. 7. The enlarged sectional view cut | disconnected by the XII-XII line of FIG. FIG. FIG. 1 is a partially omitted perspective view of a prosthesis to which a sole for a prosthesis of the present invention is attached as viewed from the back side (ground side). The partially omitted side view of the prosthesis which attached the sole for the same foot. FIG. 3 is a partially omitted top view of a prosthesis to which a sole for the same foot is attached. It is the reference drawing which explained typically the part where the thickness of the sole for artificial legs of the present invention gradually decreased, (a) is the side view, (b) is the top view, (c) is the time of use. Top view. The reference top view of the outsole concerning a modification. The partially omitted enlarged plan view of the outsole concerning a further modification. Sectional drawing cut | disconnected by the XX-XX line of FIG.

Hereinafter, the present invention will be described with reference to the drawings.
In the description of the prosthetic sole according to the present specification, the term “inside” of the direction indicating the direction is one side in the width direction, and corresponds to the thumb side according to the sole of a healthy person, and the “outside” is opposite to the width direction. Side, which corresponds to the little finger side in accordance with the sole of a healthy person.
The "tip" is one side in the longitudinal direction, and corresponds to the toe side in accordance with the sole of a healthy person, and the "rear end" is the opposite side in the longitudinal direction, and is on the heel side in accordance with the sole of a healthy person. Equivalent to. The vertical direction refers to a direction orthogonal to the width direction.
The “back surface” refers to a surface corresponding to the side (ground contact surface side) that comes into contact with the ground when using the prosthetic sole, and the “front surface” refers to the opposite surface.
“Abbreviated” means including a range allowed in the technical field to which the present invention belongs.
The numerical range represented by “lower limit value AAA to upper limit value BBB” means a range from the lower limit value AAA to the upper limit value BBB. When a plurality of the numerical value ranges are separately described, an arbitrary lower limit and an arbitrary upper limit can be selected, and “any lower limit to any upper limit” can be set.

[Overview of prosthetic sole]
It is preferable that the prosthetic sole according to the present invention has a sole body including an outsole having a spike pin, and the sole body further includes an intermediate sole. This preferred sole body includes a laminate of an outsole and an intermediate sole, and the outsole and the intermediate sole are firmly joined and integrated.
The prosthetic sole is used by being attached to the grounding surface side of the prosthesis. In use, the back surface of the outsole is in contact with the ground.
The sole for a prosthetic foot of the present invention is configured such that the thickness of the inside portion of the toe region of the sole body (however, the thickness of the sole body also includes the height of the spike pins protruding) gradually decreases toward the inside edge. The first feature is that the thickness of the outer portion of the toe region of the sole body (however, the thickness of the sole body includes the protrusion height of the spike pin) is substantially constant. I do.
The second feature of the sole for a prosthetic foot of the present invention is that an inner edge of a toe region of the outsole is extended so as to satisfy a relationship of X> Y.

Here, conceptually, when the sole body is divided into three regions in the vertical direction, the sole body includes a toe region including a leading edge, an intermediate region continuous with the toe region, and a continuous intermediate region with the intermediate region. And a rear area including a rear edge.
In the present specification, the longitudinal length of the toe region is, for example, 1/6 to 1/2 times the longitudinal length (the length from the leading edge to the trailing edge) of the sole body, and is preferable. Is 1/4 to 2/5. In specific dimensions, the longitudinal length of the toe region is between 4 cm and 12 cm, preferably between 6 cm and 10 cm. The longitudinal length of the halfway region is 1/6 to 1/2 times, preferably 1/4 to 2/5 times the longitudinal length of the sole body. In specific dimensions, the longitudinal length of the intermediate region is 4 cm to 12 cm, preferably 6 cm to 10 cm. In addition, when the toe area is conceptually divided into two left and right areas based on the width direction center line of the halfway area, a part inside the center line is called an inside part, The outer part is called the outer part.
Note that the outsole and the intermediate sole constituting the sole body can also be conceptually divided into a toe area, an intermediate area, and a rear area according to the division of the sole body. In this case, the sole body is replaced with an outsole or an intermediate sole.
Hereinafter, after describing the outsole and the intermediate sole individually, the sole for a prosthetic foot of the present invention will be described.
However, each figure shows a prosthetic sole that is mounted on the right foot of the prosthesis. The prosthetic sole for the left foot is line-symmetric with the prosthetic sole for the right foot in the illustrated example.

[Outsole]
1 to 6 show an outsole A according to one embodiment.
The outsole A includes an outsole main body 1, a plurality of spike pedestals 2 protruding from the back surface of the outsole main body 1, and a plurality of spike pins 3.
The outsole main body 1 is slightly curved so as to be warped to the surface side in the vertical direction (see FIG. 2), and the overall schematic shape is substantially plate-shaped. Of course, the outsole body 1 may be entirely flat without being curved to the front side.
The surface of the outsole body 1 is a substantially smooth surface.
As shown in FIG. 5 and FIG. 6, the peripheral edge of the back surface side of the outsole main body 1 is formed in an arc shape in a cross-sectional view for cornering. Therefore, the peripheral edge portion of the outsole body 1 is smoothly chamfered and formed to be thinner toward the peripheral edge. The degree of chamfering is common over the entire periphery, and therefore, the chamfered shapes of the peripheral edges facing in the width direction are substantially symmetrical, and the chamfered shapes of the peripheral edges facing in the vertical direction are substantially symmetrical. It is a shape.
The thickness of the outsole main body 1 (excluding the peripheral portion) is not particularly limited, and is, for example, 2 mm to 10 mm, and preferably 3 mm to 8 mm.

  The outsole main body 1 is made of a hard resin non-foam. The hard resin is not particularly limited, and includes engineering plastics such as polypropylene, polyethylene, polyolefin such as polybutene, EVA, polyurethane, polyamide, polycarbonate, polyethylene terephthalate, polyacetal, polyphenylene ether, polybutylene terephthalate, polysulfone, polyimide, and ionomer resin. Can be used. In addition, a fiber reinforced plastic or the like can be used as the hard resin.

The toe region of the outsole main body 1 has a portion 18 whose inner edge is projected so as to satisfy the relationship of X> Y in plan view. Hereinafter, the protruding portion is referred to as an “extended portion 18”. Here, X is the length between the inner edge 111a of the toe region and the width direction center line Z of the halfway region, and Y is the outer edge 11b of the toe region and the width direction of the halfway region, as shown in FIG. It means the length between the center line Z. The center line Z in the width direction of the halfway region (the center line Z is indicated by a two-dot chain line in FIG. 4) is a virtual straight line extending in the vertical direction passing through the center point in the width direction of the halfway region.
The extension 18 may be provided over substantially the entire inside of the toe region, or may be provided in a part thereof. In the illustrated example, the extension portion 18 is provided on substantially the entire toe area.
By having the extension portion 18, the inside of the toe region has a larger area than the outside with respect to the center line Z.

An inner edge 11a of the toe region extends substantially linearly in the vertical direction in a plan view, and a first portion 111a extending between the first portion 111a and the inner edge 12a of the intermediate region inclining with respect to the vertical direction. And two portions 112a. Since the second portion 112a is inclined with respect to the vertical direction, the durability of the extension portion 18 is improved. However, the second portion 112a may not be inclined with respect to the vertical direction, and may be formed, for example, to extend substantially linearly in the width direction.
The leading edge 11c of the toe region extends substantially linearly in the width direction in plan view.
The arc between the tip edge 11c and the inner edge 11a of the toe region is formed in a plan view. The boundary between the leading edge 11c of the toe region and the inner edge 11a is referred to as the leading inner edge 11d of the toe region. When formed in the arc shape in plan view, the boundary between the tip edge 11c and the inner edge 11a of the toe region indicates the arc-shaped middle point. Note that the inner edge 11a of the toe region and the distal edge 11c of the toe region may be substantially right-angled and continuous (not shown), and in this case, the distal inner edge 11d is a right angle portion.
The outer edge 11b of the toe region corresponding to the first portion 111a and the second portion 112a in the width direction is formed in a substantially linear shape extending in the vertical direction, and between the leading edge 11c and the outer edge 11b of the toe region, It is formed in an arc shape.
The first portion 111a of the toe region and the outer edge 11b of the toe region extend, for example, in parallel.

The inner edge 12a of the halfway area extends substantially linearly in the vertical direction in plan view, and the outer edge 12b of the halfway area extends substantially linearly continuously with the outer edge 11b of the toe area in plan view. The inner edge 12a and the outer edge 12b extend in parallel.
Since the second portion 112a of the toe region that is continuous with the inner edge 12a of the halfway region extends outward at a slight angle, the extended portion 18 that extends beyond the inner edge 12a of the halfway region is formed. Have been.
Note that the inner edge 13a and the outer edge 13b of the rear area extend in an inclined manner so as to approach each other toward the rear edge 13c. However, the inner edge 13a and the outer edge 13b of the rear area may extend substantially linearly in the vertical direction continuously from the inner edge 12a and the outer edge 12b of the intermediate area.

On the back surface of the outsole body 1, a plurality of spike pedestals 2 to which the spike pins 3 are attached are provided. The spike base 2 is formed in a gentle dome shape (for example, a shape in which a flat plate is turned over).
For example, the spike pedestal portion 2 is formed integrally with the outsole body 1 using a hard resin or the like.

The spike pins 3 are typically made of metal, but may be made of ceramic, hard resin, or the like.
As the spike pins 3, typically, a spike pin (hereinafter, referred to as a detachable pin) removably attached to the outsole main body 1, and a spike pin (hereinafter, fixed) fixedly attached to the outsole main body 1 An expression pin) is known. In the present invention, either one of the detachable pin and the fixed pin may be used, or both the detachable pin and the fixed pin may be used.
In the illustrated example, a fixed pin and a detachable pin are used. The protrusion height of each spike pin 3 is the same.
The fixed pin may be directly embedded in and fixed to the spike pedestal portion 2 (outsole main body 1), or may be a spike pedestal portion 2 (outsole main body 1) via a support member such as a support plate. ) May be fixed.
In the present embodiment, the fixed pins are a fixed pin (hereinafter, referred to as a first fixed pin) projecting from the support plate and a fixed pin (hereinafter, referred to as a first fixed pin) embedded in the spike base 2. A second fixed pin).

The first fixed pin 31 is projected from a support plate 38 such as a metal plate. The support plate 38 is fixed to the spike pedestal 2 to project from the back surface of the outsole body 1. . The second fixed pin 32 is projected from the back surface of the outsole main body 1 by embedding the end of the second fixed pin 32 in the spike base 2.
In the present embodiment, it has two first fixed pins 31 and two second fixed pins 32.
Specifically, the support plate 38 is formed of, for example, a relatively thin plate-like body, and has a shape (for example, a substantially V-shape in plan view) in which two arms 381 and 382 extend from the base 383 in plan view. (See FIG. 4). The support plate 38 is preferably made of metal, but may be formed of ceramic, hard resin, or the like. The base 383 of the support plate 38 is disposed at the center of the spike pedestal 2, the first arm 381 is disposed toward the distal edge 11 c of the outsole main body 1, and the second arm 382 is disposed inside the distal end. It is arranged toward the edge 11d. The ends of the first arm 381 and the second arm 382 extend to the peripheral edge of the outsole body 1 and are curved according to the arc shape of the peripheral edge. One first fixed pin 31 projects from an end of the first arm 381, and another first fixed pin 31 projects from an end of the second arm 382. Therefore, one first fixed type pin 31 is protruded inclining toward the leading edge 11c according to the arc shape of the peripheral edge of the outsole main body 1. The first fixed pin 31 projecting inclining toward the tip edge 11 c is the spike pin 3 arranged on the most distal end side of the outsole body 1. Further, another first fixed pin 31 is formed to protrude obliquely toward the tip inner edge 11d according to the arc shape of the peripheral edge of the outsole main body 1.

The two second fixed pins 32 are arranged side by side in the width direction.
The first fixed pin 31 and the second fixed pin 32 are both disposed inside the toe area. As described above, the inside portion of the toe region indicates a portion inside the center line Z in the width direction of the halfway region, and the outside portion of the toe region indicates a portion outside the center line Z.

The detachable pin 33 is attached to an attachment portion 39 buried in the spike pedestal portion 2. For example, the detachable pin 33 is detachably attached to the attachment portion 39 by a screw action.
A predetermined number of detachable pins 33 are provided. For example, four detachable pins 33 are attached to the toe area, four detachable pins 33 are attached to the midway area, and two detachable pins 33 are attached to the rear area.
The spike pins 3 are arranged more densely on the inner part of the toe area than on the outer part of the toe area.
The installation rate of the spike pins 3 per unit area in the inner part of the toe area is larger than the installation rate of the spike pins 3 per unit area in the outer part of the toe area. The installation ratio of the inner portion is obtained by the total number of spike pins in the inner portion / the area of the inner portion, and the installation ratio of the outer portion is obtained by the total number of spike pins in the outer portion / the area of the outer portion.

[Intermediate sole]
7 to 13 show an intermediate sole B according to one embodiment.
The intermediate sole B constitutes a sole body of the present invention integrally with the outsole A on which the spike pins 3 are protruded.
The intermediate sole B is formed in a plate shape as a whole.
The surface of the intermediate sole is a substantially smooth surface, and the rear surface of the intermediate sole B body is a substantially smooth surface except for a gradually decreasing portion described later.
Further, the intermediate sole B is formed to have a substantially uniform thickness except for the gradually decreasing thickness portion.
The thickness of the intermediate sole B excluding the gradually reduced thickness portion is not particularly limited, and is, for example, 3 mm to 15 mm, and preferably 4 mm to 10 mm.

The intermediate sole B may be formed of a non-foamed body, or may be formed of a foamed body. Examples of the material for forming the intermediate sole B include a non-foamed or foamed material of a hard resin, a non-foamed or foamed material of rubber or an elastomer, and the like. A foam that is elastically deformable is preferable because it can provide an appropriate cushioning property, and a foam is preferable because it can be reduced in weight.
When using a foam, depending on the material, if the expansion ratio is too large, the intermediate sole B will be compressed by the load during use, there is a risk that the thickness difference between the inside and outside may disappear, if too small, the substantial It is no different from a non-foamed material. From such a viewpoint, the expansion ratio of the foam is, for example, 1.3 times to 1.65 times, and preferably 1.4 times to 1.5 times. The illustrated intermediate sole B is formed from a foam of an ethylene-vinyl acetate copolymer.

The back surface of the intermediate sole B has a larger area than the front surface of the intermediate sole B.
Specifically, as shown in FIG. 7, the back surface of the toe region of the intermediate sole B has a portion 58 whose inner edge is projected so as to satisfy the relationship of X> Y in plan view. . Hereinafter, the protruding portion is referred to as an “extended portion 58”. Here, X is the length between the inner edge 511a of the back surface of the toe region of the intermediate sole B and the center line W in the width direction of the back surface of the halfway region, and Y is the back surface of the toe region, as shown in FIG. Between the outer edge 51b and the center line W in the width direction of the back surface of the intermediate region. The center line W in the width direction on the back surface of the halfway region (the center line W is indicated by a two-dot chain line in FIG. 7) is a virtual straight line extending in the vertical direction passing through the center point in the width direction of the back surface of the halfway region.
The extension portion 58 may be provided over substantially the entire inside of the back surface of the toe region, or may be provided in a part thereof. In the illustrated example, the extension portion 58 is provided on substantially the entire back surface of the toe region.

Referring to FIG. 7, an inner edge 51 a of the back surface of the toe region of the intermediate sole B has a first portion 511 a extending substantially linearly in a vertical direction in plan view, and the inside of the back surface of the first portion 511 a and the halfway region. And a second portion 512a extending between the edges 52a so as to be inclined with respect to the vertical direction.
The leading edge 51c on the back surface of the toe region extends substantially linearly in the width direction in plan view.
The arc between the front edge 51c and the inner edge 51a on the back surface of the toe region is formed in a plan view. The boundary between the leading edge 51c of the toe region and the inner edge 51a is referred to as the leading inner edge 51d of the toe region. When formed in the arc shape in plan view, the boundary between the tip edge 51c and the inner edge 51a of the toe region indicates the arc-shaped middle point. The inner edge 51a on the back surface of the toe region and the front edge 51c on the back surface of the toe region may be substantially perpendicular to each other and continuous (not shown). In this case, the front inner edge 51d is formed at the right angle. Department.
The outer edge 51b on the back surface of the toe region corresponding to the first portion 511a and the second portion 512a in the width direction is formed in a substantially linear shape extending in the vertical direction, and the front edge 51c and the outer edge 51b of the back surface of the toe region. The space between them is formed in an arc shape.
The first portion 511a on the back surface of the toe region and the outer edge 51b extend, for example, in parallel.

The inner edge 52a of the back surface of the halfway region extends substantially linearly in the vertical direction in plan view, and the outer edge 52b of the back surface of the halfway region is substantially linearly continuous with the outer edge 51b of the back surface of the toe region in plan view. The inner edge 52a and the outer edge 52b on the back surface of the intermediate region extend in parallel.
The second portion 512a on the back surface of the toe region, which is continuous with the inner edge 52a on the back surface of the halfway region, extends outward at a slight angle so as to extend beyond the inner edge 52a of the back surface of the halfway region. The extended portion 58 is formed.
The inner edge 53a and the outer edge 53b on the back surface of the rear region are inclined and extended so as to approach each other as approaching the rear edge 53c. However, the inner edge 53a and the outer edge 53b on the back surface of the rear region may extend substantially linearly in the vertical direction continuously from the inner edge 52a and the outer edge 52b of the intermediate region.

Since the back surface of the middle sole B and the front surface of the outsole A can be joined without excess or shortage, the back surface shape of the middle sole B is preferably substantially the same as the surface shape of the outsole A.
On the other hand, the surface of the toe region of the intermediate sole B does not have an extension as shown in FIG. The inner edge 54a of the surface of the intermediate sole B is formed in a substantially linear shape extending in the vertical direction except for the rear region, and the outer edge 54b of the surface of the intermediate sole B is formed in a substantially linear shape extending in the vertical direction except for the rear region. Is formed.

  Since the front surface of the intermediate sole B having no extended portion and the back surface of the intermediate sole B having the extended portion 58 have an area difference, the end surface 61 (thick surface) of the toe region of the intermediate sole B to absorb the area difference. Is an inclined surface. As shown in FIGS. 9 to 12, an end surface 61 is formed in an inclined shape at the inner edge 51 a, the inner edge 51 d, and the edge 51 c in the toe region of the intermediate sole B. The end surface 62 such as the outer edge 51b of the toe region of the intermediate sole B is formed in an orthogonal plane intersecting at right angles to the front and back surfaces.

The thickness of the inner portion of the toe region of the intermediate sole B is gradually reduced toward the inner edge. Preferably, the thickness of the inner portion of the toe region of the intermediate sole B is configured to gradually decrease toward the tip inner edge 51d. The portion where the thickness is gradually reduced is referred to as a gradually reduced thickness portion. In other words, the intermediate sole B has a tapered portion in which the thickness of the inner portion of the toe region becomes gradually smaller toward the inner edge (preferably, the tip inner edge).
On the other hand, the thickness of the outer portion of the toe region of the intermediate sole B is substantially constant. This portion having a substantially constant thickness is referred to as a uniform thickness portion. In other words, the intermediate sole B has a uniform thickness portion in which the thickness of the outer portion of the toe region is substantially constant. The uniform thickness portion is continuous with the gradually decreasing thickness portion and is arranged outside the gradually decreasing thickness portion.
Accordingly, the toe region of the intermediate sole B is asymmetrical in and out in the width direction.

The tapered portion may be provided on at least a part of the inner portion of the toe region of the intermediate sole B, may be a part of the inner portion of the toe region, or may be the entirety.
Further, the tapered portion may be provided at least on the inner portion of the toe region of the intermediate sole B, and may be slightly extended on the outer portion.
For example, the thickness of a region from the inner edge 51a to at least 1/4 width of the inner portion of the toe region of the intermediate sole B is gradually reduced toward the inner edge 51a. The region from the inner edge 51a of the toe region to the 1/4 width is a region corresponding to 1/4 of the entire width from the inner edge 51a when the full width of the toe region is divided into four equal parts. In the illustrated example, the thickness of a portion of the inner portion of the toe region of the intermediate sole B that is slightly more than half the width from the inner edge 51a is gradually reduced toward the inner edge 51a.
The uniform thickness portion is continuous with the gradually decreasing thickness portion as described above, and is provided on a part or the whole of the outer portion of the toe region of the intermediate sole B. In the illustrated example, the thickness of the portion of the intermediate sole B other than the gradually reduced thickness portion is substantially constant.

The gradually decreasing thickness portion can be formed by forming the front surface and / or the back surface of the intermediate sole B as a tapered surface 7 inclined toward the inner edge 51a (preferably, the front inner edge 51d).
In the illustrated example, at least the surface of the intermediate sole B is a tapered surface 7 to form a gradually decreasing thickness portion. For example, as shown in FIG. 13, the tapered surface 7 is formed in a fan-shaped range centered on the tip inner edge 51 d in plan view. It is inclined so that the wall thickness decreases toward the inner edge 51d. Therefore, the intermediate sole B has the smallest thickness at the tip inner edge 51d. When the tapered portion is cut in the width direction, as shown in FIG. 12, the thickness gradually decreases toward the inner edge 51a, and the thickness of the inner edge 51a is the smallest in that direction. In addition, when the tapered portion is cut in the width direction, as shown in FIG. 11, the thickness gradually decreases toward the leading edge 51c, and the thickness of the leading edge 51c is the smallest in that direction.

[Prosthesis sole and prosthesis]
The sole body C is obtained by joining the back surface of the intermediate sole B to the front surface of the outsole A having the spike pins 3 (see FIGS. 14 to 16). In the sole for a prosthesis according to the present invention, the sole body C is a main component. The prosthetic sole according to the present invention may have other components provided that the sole body C is provided.
When the prosthetic sole is used, the surface of the intermediate sole B is joined to the back surface (ground contact surface) of the prosthetic leg D as shown in FIG.
The method of joining the outsole A and the intermediate sole B and the method of joining the intermediate sole B and the artificial leg D are not particularly limited, and examples include joining using an adhesive.
The prosthetic foot D is not particularly limited, but the prosthetic foot sole of the present invention is particularly preferably used for athletic prosthetic feet, since improvement in running performance can be expected.
In the illustrated example, a leaf spring-shaped prosthesis D is shown as a prosthesis for competition.

As described above, the intermediate sole B has a thickness gradually decreasing portion in which the thickness of the inner portion of the toe region gradually decreases toward the inner edge 51a (preferably, the tip inner edge 51d). According to the shape of the main body C, the thickness of the inner portion of the toe region including the protruding height of the spike pin gradually decreases toward the inner edge (preferably, the tip inner edge). In other words, the sole body C has a gradually reduced thickness portion whose thickness is gradually reduced. On the other hand, since the intermediate sole B has a uniform thickness portion in which the thickness of the outer portion of the toe region is substantially constant, the sole body C also includes the protrusion height of the spike pin of the outer portion of the toe region according to its shape. The thickness is almost constant. That is, the sole body C has a uniform thickness portion adjacent to the gradually decreasing thickness portion in the toe region.
As described above, when the protruding height of each spike pin 3 is the same, the protruding height of the spike pin 3 does not affect the thickness difference. Therefore, in the above embodiment, the intermediate sole B and the outsole main body 1 are joined. It can be said that what has been done constitutes the gradually reduced thickness portion.
FIG. 17 shows the intermediate sole B and the outsole body excluding the protruding height of the spike pins (the spike pins 3 of the outsole A and the spike pedestal 2) in order to make it easy to see the gradually decreasing portion of the sole body. It is a reference drawing showing only 1. In the above embodiment, the outsole body 1 is slightly curved so as to warp to the surface side. However, in FIG. It is shown without warpage.

As shown in FIGS. 17A and 17B, the thickness of the sole body C gradually decreases toward the inner edge of the tip end in the toe region, and the thickness is substantially constant outside. The sole body C has an asymmetric inner and outer shape in the width direction, as shown in FIG.
When a prosthetic limb D having a sole for a prosthetic limb having the sole body C is used, as shown in FIG. The posture below the knee is shifted inward. As described above, from preliminary studies by the present inventors, the use of the prosthetic sole of the present invention can be expected to improve performance during sprinting.

Furthermore, since the outsole A of the present invention has the extension portion 18 inside the toe region, the use of the prosthesis D with the prosthetic sole having the outsole A makes it possible to use the prosthesis D in contact with the ground in the toe region, The contact area increases inwardly. The grip force is increased by increasing the inner contact area. As described above, from preliminary studies by the present inventors, if the grip force inside the toe area is increased, an improvement in starting performance can also be expected.
In addition, since the installation ratio of the spike pins 3 in the inner portion of the toe region of the outsole A is larger than that in the outer portion, the gripping force inside the outsole A can be enhanced in synergy with the expansion portion 18. .

  By the way, the sole attachment portion of the existing leaf spring-shaped prosthesis is often substantially rectangular in plan view. When the prosthetic sole having the extension 18 according to the present invention is attached to such a substantially rectangular sole attachment surface, the extension 18 of the outsole A protrudes from the side of the attachment surface, and the extension 18 is damaged. There is a possibility that. As a method of avoiding this, there is a method of expanding the sole attachment surface of the prosthesis according to the plan view shape of the sole for a prosthesis of the present invention. In this case, the user must prepare a new prosthesis. In this regard, the back surface of the toe region of the intermediate sole B has a larger area than its front surface, so that the back surface of the intermediate sole B overlaps the surface of the outsole A, and the surface of the intermediate sole B is It will overlap the mounting surface of the prosthesis.

[Modification]
In the above embodiment, as a means for configuring the thickness of the inner portion of the toe region of the sole body (including the protruding height of the spike pin) to gradually decrease toward the inner edge, the intermediate sole has a gradually decreasing thickness (for example, Although a back surface or a tapered surface is provided, the present invention is not limited to this. For example, a gradually decreasing thickness portion may be provided on the outsole body.
As shown in FIG. 18, a means may be used in which the protruding height of the spike pins 3 arranged on the inner side of the toe region of the outsole A is reduced toward the inner edge side of the toe region of the outsole A. . Even when the protrusion height of the spike pin 3 is changed in this manner, the thickness including the protrusion height of the spike pin in the inner portion of the toe region of the sole body can be gradually reduced toward the inner edge.

  Further, as shown in FIGS. 19 and 20, an arbitrary recess 8 may be formed in the plane of the outsole main body 1 to such an extent that the strength of the outsole A is not impaired. By forming such a concave portion 8, the outsole A can be reduced in weight.

A Outsole B Intermediate sole C Sole body D Prosthesis 1 Outsole body 3,31,32,33 Spike pin

Claims (9)

In the sole for the prosthesis used by attaching to the grounding surface of the prosthesis,
A sole body including an outsole on which a plurality of spike pins are protruded,
The thickness of the inner part of the toe region of the sole body, including the protruding height of the spike pin, gradually decreases toward the inner edge, and the outer part of the toe region of the sole body has the spike pin. A prosthetic sole that is configured so that a thickness including a protruding height is substantially constant. The sole body further includes an intermediate sole interposed between the outsole and a ground contact surface of the prosthesis,
The sole for a prosthesis according to claim 1, wherein a thickness of an inner portion of a toe region of the intermediate sole is configured to gradually decrease toward an inner edge.   The sole for a prosthetic foot according to claim 2, wherein a thickness of an inner portion of the toe region of the intermediate sole is gradually reduced toward a tip inner edge.   The prosthetic foot according to any one of claims 1 to 3, wherein, of the spike pins, a spike pin arranged on the most distal end side of an outsole is inclined and protruded toward a tip edge of the outsole. Sole.   The installation rate per unit area of the spike pins in the inner part of the toe area is larger than the installation rate per unit area of the spike pins in the outer part of the toe area. Sole for prosthesis. The outsole has a toe region and a halfway region continuous with the toe region,
The prosthetic sole according to any one of claims 1 to 5, wherein an inner edge of the toe region has a portion protruding so as to satisfy a relationship of X> Y.
However, X is the length between the inner edge of the toe area and the width direction center line of the halfway area, and Y is the length between the outer edge of the toe area and the width direction center line of the halfway area. Refers to the length.   An inner edge of a toe region of the outsole extends substantially linearly in a vertical direction in a plan view, and extends obliquely with respect to the vertical direction between the first portion and an inner edge of the halfway region. The prosthetic limb sole according to claim 6, comprising a second portion. The sole body further includes an intermediate sole interposed between the outsole and a ground contact surface of the prosthesis,
The toe region of the intermediate sole has a back surface joined to the outsole, and a surface joined to the ground surface of the prosthesis,
The sole for a prosthesis according to claim 6 or 7, wherein the back surface has a larger area than the front surface. In the sole for the prosthesis used by attaching to the grounding surface of the prosthesis,
A sole body including an outsole on which a plurality of spike pins are protruded,
The outsole has a toe region and a halfway region continuous with the toe region,
A sole for a prosthesis having a portion where an inner edge of the toe region protrudes so as to satisfy a relationship of X> Y.
However, X is the length between the inner edge of the toe area and the width direction center line of the halfway area, and Y is the length between the outer edge of the toe area and the width direction center line of the halfway area. Refers to the length.

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