JPWO2019203288A1 - Competition prosthesis sole - Google Patents

Abstract

A sole attached to a contact area extending in an arc shape from the toe to the curved portion side of a competition artificial limb, and the sole has a bottom surface having a shape that follows the extending shape of the contact area, and the bottom surface is the said. The widthwise land portion has at least one widthwise land portion partitioned by a plurality of widthwise grooves extending in the width direction of the sole, and the widthwise land portion has a wavy portion having a shape along a wavy line extending in the width direction of the sole. The wavy portion has at least a pair of a convex portion protruding on the convex side of the mountain and a convex portion protruding on the convex side of the valley from the respective positions of the adjacent peaks and valleys in the wavy line. Competitive prosthesis sole, characterized by inclusion.

Description

INDUSTRIAL APPLICABILITY The present invention enhances traction performance by generating a strong traction force between the road surface and the sole when the sole attached to the contact area of the competition prosthesis, especially when the wearer of the competition prosthesis starts running or accelerates. Regarding the sole of the artificial limb for competition.

Conventionally, a competition prosthesis (hereinafter, also referred to as a competition prosthesis or simply a prosthesis) having a leaf spring-like foot extending to the toe side via a curved portion and having a contact area extending in an arc shape from the toe to the curved portion side. Is known. In a competition artificial limb having such a leaf spring-shaped foot, a sole that comes into contact with the road surface is generally attached to the bottom surface of the contact area.

For example, Patent Document 1 exemplifies a sole attached to the lower surface of a curved leaf spring-shaped artificial limb for competition, which corresponds to a sport such as jogging or running. That is, Patent Document 1 describes a sole on which spikes are attached on the lower surface of the sole that comes into contact with the road surface, and a sole that is provided with a large number of outsole portions each having a hexagonal ground contact surface.

Japanese Unexamined Patent Publication No. 2016-150189

However, the sole exemplified in Patent Document 1 has not sufficiently obtained traction performance when the wearer of the artificial limb starts running or accelerates. That is, with a sole provided with a convex portion divided in the width direction on the bottom surface as exemplified in Cited Document 1, a prosthesis is worn because sufficient grip with the road surface cannot be obtained when starting or accelerating. In some cases, the athlete who made the race could not fully demonstrate his driving skills.

Therefore, an object of the present invention is to provide a sole for a competition prosthesis with improved traction performance when a wearer of the competition prosthesis starts running or accelerates.

The inventor has earnestly investigated the means for solving the above-mentioned problems. That is, when the bottom surface of the sole of the artificial limb for competition was examined in detail, it is possible to impart an edge component due to the unevenness formed by providing a groove on the bottom surface, but there are various cases when starting to run or accelerating. It was found that by unifying the direction of the groove in the width direction of the sole rather than arranging the grooves in the direction, the edge component increases along the width direction of the sole, and as a result, a large grip force on the road surface can be obtained. .. Furthermore, by devising the shape of the concavo-convex shape, it was also conceived that the convex portion could be provided with rigidity corresponding to the running motion of the artificial limb, and the present invention was completed.

The sole of the competition prosthesis of the present invention is a contact of a competition prosthesis having a leaf spring-shaped foot extending toward the toe side through at least one curved portion, extending in an arc shape from the toe to the curved portion side. An area-mounted sole, the sole having a bottom surface shaped to follow the extending shape of the tangent area, the bottom surface being partitioned by at least a plurality of widthwise grooves extending in the width direction of the sole. The widthwise land portion has one widthwise land portion, the widthwise land portion has a wavy portion having a shape along a wavy line extending in the width direction of the sole, and the wavy portion is a mountain and a valley adjacent to each other in the wavy line. It is characterized by including at least a pair of a convex portion projecting to the convex side of the mountain and a convex portion projecting to the convex side of the valley from each position.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a sole for a competition prosthesis with improved traction performance when the wearer of the competition prosthesis starts running or accelerates.

It is a side view of the artificial limbs for competition which the sole which concerns on one Embodiment of this invention is attached. It is a figure which shows the pattern of the bottom surface of the sole which concerns on one Embodiment of this invention. It is a figure which shows one shape of the land part in the width direction of the pattern of FIG. It is a partially enlarged view of FIG. It is a figure which shows the variation of the land part in the width direction. It is a figure which shows the variation of the land part in the width direction. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure which shows the pattern of the bottom surface of the sole which concerns on other embodiment of this invention.

Hereinafter, the sole of the artificial limb for competition (hereinafter, also referred to as a sole) of the present invention will be described in detail by exemplifying an embodiment thereof with reference to the drawings.

FIG. 1 is a side view of a competition prosthesis 1 to which the sole 5 according to the first embodiment of the present invention is attached. The competition prosthesis 1 has a leaf spring-shaped foot portion 2, and the sole 5 is attached to the contact area on the tip end side thereof. Although not shown, the base end of the foot 2 is connected to the socket via an adapter, and the wearer wears the artificial limb by accommodating the stump of the wearer's foot in the socket. be able to. As the adapter and socket, those corresponding to the stump position of the foot, such as a thigh artificial limb and a lower leg artificial limb, are used. FIG. 1 shows a foot portion 2 and a sole 5 in an upright state of a wearer wearing a competition prosthesis 1.

Hereinafter, in the present embodiment, the side where the foot portion 2 is connected to the adapter is referred to as a connection side, and the side where the foot portion 2 is in contact with the road surface S is referred to as a ground contact side in the height direction of the competition prosthesis. Further, the toe T of the artificial limb 1 for competition refers to the point where the foot portion 2 extends from the connection side and ends.

In the present embodiment, the foot portion 2 of the competition prosthesis 1 has a shape extending in a plate shape toward the toe T side via at least one curved portion, that is, the curved portion 3 of 1 in the illustrated example. In FIG. 1, the foot portion 2 has a straight portion 2a, a curved portion 2b convex to the toe T side, a curved portion 3 convex to the rear side in the front-rear direction Y of the foot, and a concave portion to the ground contact side, in this order from the connection side to the ground contact side. It is composed of a curved portion 2c of the above and a ground contact portion 4 extending to the toe T side in an arc shape that is convex toward the ground contact side.

Although the material of the foot portion 2 is not limited, it is preferable to use carbon fiber reinforced plastic or the like from the viewpoint of strength and weight reduction.

The ground contact portion 4 has a contact area 4s extending in an arc shape from the toe T to the curved portion 3 side on the ground contact side, and the sole 5 is attached to the contact area 4s. The contact area 4s refers to the entire area that comes into contact with the road surface S when the wearer wearing the competition prosthesis 1 performs a straight running motion, and when the sole 5 is attached, the contact area 4s is the sole 5. It comes into contact with the road surface S via.

The material of the sole 5 is not particularly limited, but rubber or the like can be used, for example.

The sole 5 has a shape that follows the extending shape of the contact area 4s. Further, the ground contact side of the sole 5 is the sole bottom surface 5s. As shown in FIG. 1, the sole bottom surface 5s has a shape in which arcs X1 and X2 are continuous from the toe T side to the curved portion 3 side. In the present embodiment, the arc X1 and the arc X2 have different radii of curvature, but may have the same radii of curvature.

Hereinafter, the direction in which the sole bottom surface 5s extends from the toe T side to the curved portion 3 side is referred to as the Y direction, and the width direction of the sole bottom surface 5s orthogonal to the Y direction is referred to as the W direction.

Hereinafter, with reference to FIGS. 2, 3 and 4, the sole bottom surface 5s of the sole 5 of the competition prosthesis according to the embodiment of the present invention will be described. FIG. 2 shows a pattern of the sole bottom surface 5s according to the embodiment of the present invention. In the illustrated example, the sole bottom surface 5s has at least one widthwise land portion 10 partitioned by a plurality of widthwise grooves 20 extending in the W direction, and three rows of widthwise land portions 10 in FIG.

FIG. 3 shows the shape of one of the three rows of land portions 10 in the width direction. As shown in the illustrated example, the land portion 10 in the width direction has a wavy portion 6 having a shape along the wavy line P1 extending in the W direction. The wave referred to here refers to a shape such as a sine wave or unevenness in which substantially the same shape changes its phase with substantially the same period. The land portion 10 in the width direction may have a land portion extending with a predetermined width along such a wavy wavy line P1, and in the illustrated example, the land portion exhibiting a wavy shape over the entire width of the sole bottom surface 5s. is there. That is, in the illustrated example, the entire land portion 10 in the width direction is a wavy portion 6.

The effects obtained by forming the land portion 10 in the width direction to have the wavy portion 6 are as follows. That is, when the wearer wearing the competition prosthesis 1 starts running or accelerating, the ground contact portion of the bottom surface 5s with respect to the road surface S is from the curved portion 3 side to the toe T side, or from the toe T side to the curved portion 3. Since it moves to the side, it is required to have an edge component in a direction crossing the Y direction, in other words, a direction along the W direction. Therefore, the land portion 10 in the width direction is basically shaped to extend in the W direction to impart an edge component in the W direction. Further, by making the land portion 10 in the width direction wavy, an edge component in the Y direction is added in addition to the edge component in the W direction, so that the land portion shape has a higher edge effect as a whole. , The grip force on the road surface S can be increased.

Here, the wavy portion 6 is a convex portion 6a protruding from the respective positions of the adjacent peaks M1 and valley V1 on the wavy line P1 to the convex side of the peak M1, or to the toe T side in the illustrated example, and the convex side of the valley V1. In the illustrated example, it is important to have at least a pair of convex portions 60 with the convex portion 6b protruding toward the curved portion 3 side. The illustrated example includes five pairs of convex portions.

FIG. 4 is an enlarged view of one of the convex portions vs. 60 in FIG. In FIG. 4, the convex portion 6a is W as the edge of the wavy portion 6 in the Y direction bends in the Y direction from the extending direction of the wavy portion 6 from the points q1 and q2 toward the toe T side in the Y direction. It is a shape that reduces the directional width. Further, the convex portion 6b has the same shape as the convex portion 6a, and the edge of the wavy portion 6 in the Y direction bends in the Y direction from the extending direction of the wavy portion 6 from the points q1'and q2'. The shape is such that the width in the W direction decreases toward the curved portion 3 side in the Y direction. If the convex portions 6a and 6b have a shape protruding from the positions of the peaks M1 and valleys V1 of the wavy portion 6 toward the toe T side or the curved portion 3 side in the Y direction, the width in the W direction decreases as described above. In addition to the shape, the shape may have a constant width in the W direction. For example, it can be any shape such as a trapezoid, a shape with rounded corners on the tip side of the trapezoid, a semi-elliptical shape, and a triangle.

By imparting the convex portion pair 60 to the wavy portion 6, the edge component of the land portion 10 in the width direction can be further increased, and the edge effect in both the Y direction and the W direction can be enhanced. Further, by having a convex portion on both the toe T side in the Y direction and the curved portion 3 side, the rigidity of the width direction land portion 10 as a whole in the width direction land portion 10 in the Y direction is increased, which is combined with the edge effect. , The traction performance of the competition prosthesis 1 can be fully exhibited. Further, the convex portion pair 60 can effectively give the land portion 10 in the width direction a shape that cuts the water film existing between the sole bottom surface 5s and the road surface S on both sides in the Y direction, resulting in high drainage. It can demonstrate its performance and prevent slipping.

The convex portion 6a in FIG. 4 has a virtual line segment connecting points q1 and q2 as the base D1 and a side parallel to the base D1 on the toe T side as the base U1. It has a trapezoidal shape that is line-symmetric with respect to the line segment b1. The convex portion 6b has the same shape as the convex portion 6a, and has a shape in which the width in the W direction gradually decreases from the points q1 ′ and q2 ′ toward the curved portion 3 side in the Y direction, and the points q1 ′ and q2 The side of the virtual line segment connecting ′ is the base D1 ′, and the side of the curved portion 3 side parallel to the base D1 ′ is the base U1 ′, which is line-symmetric with respect to the virtual line segment b2 extending in the Y direction through the valley V1. It has a trapezoidal shape.

The trapezoidal convex portions 6a and 6b will be described in more detail with the convex portions 6a as a typical example. The convex portion 6a has an angle γ1 formed by a virtual line segment L1 extending from the point q1 to the toe T side along the trapezoidal leg and a virtual line segment L2 extending from the point q2 to the toe T side along the trapezoidal leg. It is preferable that the temperature is more than 5 ° and less than 60 °, and the length l1 of the bottom U1 in the W direction is 0 mm or more and less than 7 mm. With the above configuration, the rigidity of the convex portions 6a and 6b is increased, and the drainage performance of effectively discharging the water existing between the sole bottom surface 5s and the road surface S on the wet road surface is also exhibited. be able to.

The convex portions 6a and 6b may have a semi-elliptical shape as shown in FIG. In FIG. 5, the land portion 10 in the width direction has a wavy portion 6 having a shape along a wavy wavy line P1 extending in the W direction, and the convex portions 6c and 6d are half on the toe T side or the curved portion 3 side in the Y direction. It has an elliptical protruding shape.

Further, as shown in FIG. 4, the angle on the acute angle side formed by the virtual line segment L3 connecting the tips c1 and c2 of the convex portions 6a and 6b in the convex portion pair 60 with respect to the W direction, in the illustrated example, the virtual line segment. The acute angle side angle θ1 formed by the line segment L4 extending in the W direction with L3 is preferably 30 ° or more and 55 ° or less.
Here, the tips c1 and c2 of the convex portions 6a and 6b refer to the center points of the trapezoidal convex portions 6a and 6b at the length l1 in the W direction of the bottom U1 in the illustrated example. When the convex portions 6a and 6b have a side along the W direction such as the trapezoidal shape of the illustrated example, the center point of the side is called the tip, but the most protruding point such as the case of the semi-elliptical shape shown in FIG. In the case of a shape having, the most protruding point is called the tip. In FIG. 5, the most protruding point of the convex portion 6a is the point c3, and the most protruding point of the convex portion 6b is the point c4.
By setting the angle θ1 to 30 ° or more, the drainage performance of the land portion 10 in the width direction can be sufficiently exhibited, and by setting the angle θ1 to 55 ° or less, the land portion 10 in the width direction centered on the convex portions 6a and 6b. Supporting each other is realized, and rigidity can be increased.

Further, the angle on the acute angle side of the land portion 10 in the width direction with respect to the W direction in the extending direction, in the illustrated example, the angle θ2 on the acute angle side formed by the wavy line P1 with respect to the line segment L5 extending in the W direction is with respect to the angle θ1. , 0.35 or more and 2.16 or less is preferable. By setting such a numerical range, it is possible to achieve both the rigidity of the land portion 10 in the width direction and the drainage performance. Preferably, the ratio θ2 / θ1 is 0.45 or more and 0.9 or less, and more preferably 0.655.

Further, the maximum length w1 in the width direction of the sole 5 is 5 times or more and 25 times or less the distance w2 in the W direction between the tips c1 and c2 of the convex portions 6a and 6b in the convex portion pair 60. Is preferable. By setting the distance w2 in the sole width direction to 5 times or more the maximum length w1 in the width direction, sufficient rigidity can be imparted to the sole bottom surface 5s and the traction performance can be improved. Further, by setting the value to 25 times or less, it is possible to prevent the sole bottom surface 5s from losing its flexibility in the W direction.
Preferably, the length w1 is 8 times or more and 10 times or less the distance w2, and more preferably 9 times.

The maximum length w1 in the width direction of the sole 5 is preferably 6 cm or more and 15 cm or less. The suitable range varies depending on the height, width, weight, etc. of the wearer of the artificial limb, but is generally 8 cm or more and 10 cm, and more preferably 8 cm for competition.

Further, the distance w2 in the W direction between the tip c1 and the tip c2 of the convex portions 6a and 6b in the convex portion pair 60 is preferably 6 mm or more and 20 mm or less. By setting the distance w2 to 6 mm or more, it is possible to secure a distance between the convex portions 6a and 6b and prevent the sole bottom surface 5s from losing its flexibility in the W direction. Further, by setting the thickness to 20 mm or less, sufficient rigidity can be imparted to the sole bottom surface 5s, and the traction performance can be improved.
The distance w2 is preferably 8 mm or more and 10 mm or less, and more preferably 9 mm.

In the width direction land portion 10, the length y1 along the extending direction Y of the sole passing through the tip c1 or c2 of the convex portion 6a or 6b is larger than the length v1 orthogonal to the extending direction of the width direction land portion 10. Is preferable.
Here, the length v1 orthogonal to the extending direction of the width direction land portion 10 is the extension of the width direction land portion 10 between the peak M1 and the valley V1 of the wavy line P1 except for the convex portions 6a and 6b. Refers to the length orthogonal to the direction. The length v1 may be any position at any position when the width of the land portion 10 in the width direction excluding the convex portions 6a and 6b is uniform, but when the width is not uniform, the length v1 is defined as the maximum length. Refers to the average value of the minimum length.
By making the length y1 of the land portion 10 in the width direction larger than the length v1, sufficient rigidity can be given to the land portion 10 in the width direction.

The length v1 orthogonal to the extending direction of the land portion 10 in the width direction is preferably 0.125 times or more and 0.8125 times or less with respect to the length y1 along the extending direction Y of the sole. By setting such a numerical range, sufficient rigidity can be given to the land portion 10 in the width direction.
More preferably, it is 0.2 times or more and 0.6 times or less.

The length v1 of the land portion 10 in the width direction is preferably 1.0 mm or more and 6.5 mm or less, and more preferably 1.5 mm or more and 3.0 mm or less.

The length y1 of the land portion 10 in the width direction is preferably 3.0 mm or more and 8.0 mm or less, and more preferably 5.0 mm or more and 7.5 mm or less.

Further, the land portion 10 in the width direction preferably includes a convex portion pair 60 of 3 pairs or more and 10 pairs or less. By including three or more pairs, sufficient rigidity can be imparted to the land portion 10 in the width direction, and the traction performance can be improved. Further, by setting the number of pairs to 10 or less, it is possible to prevent the sole bottom surface 5s from losing its flexibility in the W direction.

FIG. 6 is a diagram showing variations in the land portion in the width direction. In the width direction land portion 10 shown in FIG. 6, both side walls facing the width direction groove 20 have a zigzag shape. That is, in the present embodiment, both side walls of the land portion 10 in the width direction facing the groove 20 in the width direction have a shape in which straight lines inclined in the W direction are continuous. The convex portions 6e and 6f also have a shape in which straight lines inclined with respect to the W direction are combined to form an acute angle. With such a configuration, it is possible to prevent slippage when the competition prosthesis 1 is used on a wet road surface or the like while exhibiting the above-mentioned traction performance. That is, the land portion 10 in the width direction can be effectively provided with a shape that cuts the water film existing between the bottom surface 5s of the sole and the road surface S on both sides in the Y direction, and exhibits high drainage performance. It can prevent slipping.

Next, a suitable arrangement and number of the widthwise land portions 10 will be described with reference to FIGS. 7A, 7B, 7C, 7D and FIG.

7A, 7B, 7C, and 7D show step by step the movement of the foot 2 and the contact state with the sole bottom surface 5s when the wearer wearing the competition prosthesis 1 runs straight. It is a figure for. The upper part of each drawing is a side view of the foot portion 2 and the sole 5, and the lower part of each drawing is a ground contact form of the sole bottom surface 5s when the wearer wearing the competition prosthesis 1 performs a straight running motion. It shows the transition.

That is, FIG. 7A shows a state in which the competition prosthesis 1 lifted by the wearer is lowered onto the road surface S and the entire weight is loaded on the competition prosthesis 1. As shown in the lower part of the drawing, when the artificial limb 1 is lowered onto the road surface S, the contact area of the sole bottom surface 5s is near the center of the bottom surface, and from the curved portion 3 side end of the sole bottom surface 5s and the toe T, Y Areas spaced in the direction.

FIG. 7B shows a state in which the wearer steps forward while keeping the entire weight loaded on the competition prosthesis 1 from the state of FIG. 7A. In the case of running a healthy person, it is common to step on the ground in order from the heel side of the shoe sole to the toe side, but the competition prosthesis 1 is more curved than the first ground contact. The grounding area has moved to the portion 3 side.

FIG. 7C shows a state in which the wearer swings the foot opposite to the side on which the competition prosthesis 1 is worn forward and starts the kicking motion of the competition prosthesis 1. In this kicking motion, the competition prosthesis 1 is in contact with the ground on the bottom surface 5s of the sole in a region on the toe T side of the region shown in FIGS. 7A and 7B.

FIG. 7D shows the state of the final stage in which the wearer kicks out the competition prosthesis 1 immediately before leaving the road surface S. In order to kick out from the toe T of the bottom surface 5s of the sole, the ground is further grounded in the region on the toe T side of FIG. 7C.

Based on the ground contact modes shown in FIGS. 7A, 7B, 7C and 7D, the inventor has set the above-mentioned widthwise land portion 10 in FIG. 7B in order to more easily exhibit the traction performance of the competition prosthesis 1. I came up with the idea that it is more effective to place it in the ground contact area on the curved portion 3 side than the place where it first touches down as shown in. That is, the ground contact area shown in FIG. 7B is an area in which the wearer first lands and then steps on the artificial limb 1 for competition with the total weight loaded. By arranging the land portion 10 in the width direction in such a region, a high edge function can be imparted to this region, grip force and rigidity with respect to the road surface S can be secured, and high traction performance can be exhibited.

In FIG. 2 described above, three rows of land portions 10 in the width direction are arranged in the ground contact region shown in FIG. 7B. According to this configuration, the traction performance of the sole bottom surface 5s can be further improved.

It should be noted that the bottom surface 5s of the sole has an arbitrary configuration other than the land portion 10 in the width direction, and another land portion or the like can be provided. In the pattern shown in FIG. 8, in the pattern shown in FIG. 2, three rows of the width direction land portions 10 are left, and the width direction land portions 11, 10, 12 are left from the rows of the width direction land portions 10 toward the toe T side. And sipes 13 are arranged in order.

The width direction land portion 11 has the same configuration as the width direction land portion 10 except that the width of the land portion is smaller than that of the width direction land portion 10. The area where the land portion 11 in the width direction is arranged corresponds to the ground contact area shown in FIG. 7A above. That is, the competition prosthesis 1 lifted by the wearer is lowered onto the road surface S, and the total weight is loaded on the competition prosthesis 1. Here, it is important that the region sufficiently grips the road surface S so that the balance of the entire body is maintained even if the wearer loads the entire weight on the competition prosthesis 1. By arranging the width direction land portion 11 having a width smaller than the width direction land portion 10 in such a region, the drainage function is effectively exerted along the Y direction, and the grip force with the road surface S is sufficient. It is possible to prevent the artificial limb from slipping, that is, to improve the anti-slip performance.

The land portion 12 in the width direction extends from the extending portion 12a in the width direction, which extends in a substantially wavy shape in the W direction and the width of the land portion is repeatedly wide and narrow, and the bent portion which bends in a direction convex to the toe T side. Extending the width direction extending portion 12a from the toe side protruding portion 12b extending so as to be convex in the extending direction of the width direction extending portion 12a and the bending portion bending in the bending direction 3 side in the extending direction. It is a shape including a curved portion side protruding portion 12c extending so as to be convex in the direction in which the surface is formed.

The area where the land portion 12 in the width direction is arranged is the area that comes into contact with the ground when the kicking operation of the competition prosthesis 1 is started, which is shown in FIG. 4C. By forming the shape so that the width of the land portion changes, it is possible to improve the drainage performance while increasing the rigidity of the land portion. In other words, by forming a shape in which a portion having a relatively large land width and a portion having a relatively small land width coexist, it is possible to avoid slipperiness due to the increase in the land width while increasing the land width. it can.

Further, the sole bottom surface 5s of the present embodiment includes a plurality of sipes 13 extending linearly in a direction inclined with respect to the W direction in a region from the edge on the toe T side toward the curved portion 3 side. Is preferable. In the area where the sipe 13 is arranged, as shown in FIG. 7D, the wearer swings the foot opposite to the side wearing the competition prosthesis 1 forward to perform the kicking motion of the competition prosthesis 1. Area of. This region is a region in which wear is particularly likely to progress because the ground contact is made in order toward the toe T and the wearer pushes the road surface S on the bottom surface 5s of the sole and touches the ground so as to slide. Therefore, in this region, it is important to improve the wear resistance performance and maintain the slip resistance at the time of touchdown.

In particular, a certain region from the edge of the sole bottom surface 5s on the toe T side on which the sipe 13 is formed is a region in FIG. 1 corresponding to an arc X1 continuous with a constant radius of curvature from the toe T. As shown in 7D, the wearer wearing the competition prosthesis 1 tended to touch the ground at the end and cause more severe wear when performing the kicking motion. Therefore, in this region, it is necessary to have particularly high wear resistance. Therefore, the sipe 13 having a width smaller than the groove formed in the other region is formed, and the edge component is distributed without impairing the rigidity. Therefore, the sole bottom surface 5s can be protected from severe wear, and the service life of the foot portion 2 itself can be extended.

In the pattern of the sole bottom surface 5s, it is preferable that fluorine is applied to the groove wall and the groove bottom forming the width direction groove 20. By applying fluorine to the groove wall and the groove bottom of the groove 20 in the width direction, the drainage performance on the bottom surface 5s of the sole can be improved.

1: Prosthesis for competition, 2: Foot, 2a: Straight, 2b, 2c: Curved, 3: Curved, 4: Ground, 4s: Contact area, 5: Sole, 5s: Sole bottom, 6: Wavy Part, 6a, 6b, 6c, 6d, 6e, 6f: Convex part, 60: Convex part pair, c1, c2, c3, c4: Tip, 10, 11, 12: Width direction land part, 13: Sipe, 12a: Width extending part, 12b: Toe side protruding part, 12c: Curved part side protruding part, 20: Width direction groove, 51s: Sole bottom surface, 101: Width direction land part, 201: Width direction groove, P1: Wavy line, M1 : Mountain, V1: Valley, D1, U1, D1', U1': Bottom, q1, q2, q1', q2': Point, S: Road surface, Y: Sole bottom surface 5s from toe T side to curved part 3 side Extending direction, W: Width direction of sole bottom surface 5s orthogonal to Y direction

Claims (6)

A sole to be attached to a contact area extending in an arc shape from the toe to the curved side of a competition artificial limb having a leaf spring-shaped foot extending toward the toe side through at least one curved portion.
The sole has a bottom surface shaped to follow the extending shape of the tangent area.
The bottom surface has at least one widthwise land portion partitioned by a plurality of widthwise grooves extending in the widthwise direction of the sole.
The widthwise land portion has a wavy portion having a shape along a wavy line extending in the width direction of the sole.
The wavy portion includes at least a pair of a convex portion protruding on the convex side of the mountain and a convex portion protruding on the convex side of the valley from the respective positions of the adjacent peaks and valleys in the wavy line. The characteristic sole of the artificial limb for competition. The sole of a competition prosthesis according to claim 1, wherein the angle on the acute angle side with respect to the sole width direction between the tips of the convex portions in the convex portion pair is 30 ° or more and 55 ° or less. The competition prosthesis according to claim 1 or 2, wherein the maximum length in the width direction of the sole is 5 times or more and 25 times or less the distance in the sole width direction between the tips of the convex portions in the convex portion pair. Sole. The widthwise land portion is according to any one of claims 1 to 3, wherein the length of the sole passing through the tip of the convex portion in the extending direction is larger than the length orthogonal to the extending direction of the widthwise land portion. Described competition prosthesis sole. The sole of a competition prosthesis according to any one of claims 1 to 4, wherein the land portion in the width direction includes the convex portion pair of 3 pairs or more and 10 pairs or less. The sole of a competition prosthesis according to any one of claims 1 to 5, wherein the widthwise land portion has zigzag-shaped walls on both sides facing the widthwise groove.

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