WO2019203288A1

WO2019203288A1 - Sole for sports artificial foot

Info

Publication number: WO2019203288A1
Application number: PCT/JP2019/016545
Authority: WO
Inventors: 大太糸井; 耕平佐橋
Original assignee: 株式会社ブリヂストン
Priority date: 2018-04-17
Filing date: 2019-04-17
Publication date: 2019-10-24
Also published as: JPWO2019203288A1

Abstract

This sole for a sports artificial foot is mounted to a ground-contact region which extends in an arc-like manner from a toe to a bent part side. The sole is characterized by having a bottom surface having a shape conforming to the extension shape of the ground-contact region, wherein the bottom surface has at least one width-direction land part demarked by a plurality of width-direction grooves which extend in the width direction of the sole, the width-direction land part has a wavy section having a shape along a wave line which extends in the width direction of the sole, and the wavy section includes at least one pair of projections that include a projection projecting toward the protruding side of a ridge and a projection projecting toward the protruding side of a valley and that project from respective positions of the ridges and the valley adjacent to each other in the wave line.

Description

Prosthetic sole for competition

This invention enhances the traction performance that generates strong traction between the road surface and the sole when the sole that adheres to the contact area of the prosthetic leg for competition, especially when the wearer of the prosthetic leg for racing starts or accelerates. Related to the sole of a prosthetic leg for competition.

Conventionally, a prosthetic leg for competition (hereinafter also referred to as a prosthetic leg for competition or simply a prosthetic leg) has a leaf spring-like leg part extending to the toe side through the curved part, and the contact area extends in an arc shape from the toe to the curved part side. Is known). Generally, such a prosthetic leg having a leaf spring-like foot portion is provided with a sole that contacts the road surface on the bottom surface of the contact area.

For example, Patent Document 1 exemplifies a sole that is attached to the lower surface of a curved plate spring-like prosthetic leg for competition, such as jogging or running. That is, Patent Document 1 describes a sole in which spikes are attached to the lower surface of a sole that contacts the road surface, and a sole in which a number of outsole portions each having a hexagonal ground surface are provided.

JP 2016-150189 A

However, in the sole exemplified in Patent Document 1, the traction performance when the prosthetic leg wearer started running or accelerated was not sufficiently obtained. In other words, the sole provided with the convex portion that is divided in the width direction on the bottom surface as exemplified in the cited document 1 cannot provide a sufficient grip with the road surface when starting or accelerating. The contested athlete may not be able to fully demonstrate his driving skills.

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

The inventor earnestly investigated the means for solving the above-mentioned problems. That is, when the bottom surface of the sole of the prosthetic leg for competition is examined in detail, an edge component due to the unevenness formed by providing a groove on the bottom surface can be given, but when running or accelerating, there are various Rather than arranging the grooves in the direction, by unifying the direction of the grooves in the width direction of the sole, it was found that the edge component increases along the width direction of the sole, resulting in a large grip force on the road surface. . Furthermore, by contriving the shape of the concavo-convex shape, it has been conceived that rigidity corresponding to the prosthetic leg running operation can be imparted to the convex portion, and the present invention has been completed.

The sole of the prosthetic leg for competition of the present invention is a contact of the prosthetic leg having a leaf spring shape extending toward the toe side through at least one curved part and extending in an arc shape from the toe to the curved part side. A sole to be attached to an area, the sole having a bottom surface shaped according to an extending shape of the contact area, and the bottom surface is defined by a plurality of widthwise grooves extending in a width direction of the sole, One width direction land portion, the width direction 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 includes a mountain and a valley adjacent to each other in the wavy line. From each position, at least one pair of the convex part which protrudes on the convex side of the peak and the convex part which protrudes on the convex side of the valley is included.

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

It is a side view of the artificial leg for competition with which the sole concerning one embodiment of the present invention was equipped. It is a figure which shows the pattern of the bottom face of the sole which concerns on one Embodiment of this invention. It is a figure which shows one shape of the width direction land part of the pattern of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is a figure which shows the variation of the width direction land part. It is a figure which shows the variation of the width direction land part. It is a figure for demonstrating stepwise the operation | movement of a leg part, and a ground-contacting form in case the artificial leg for competition is worn and a wearer runs straight ahead. It is a figure for demonstrating stepwise the operation | movement of a leg part, and a ground-contacting form in case the artificial leg for competition is worn and a wearer runs straight ahead. It is a figure for demonstrating stepwise the operation | movement of a leg part, and a ground-contacting form in case the artificial leg for competition is worn and a wearer runs straight ahead. It is a figure for demonstrating stepwise the operation | movement of a leg part, and a ground-contacting form in case the artificial leg for competition is worn and a wearer runs straight ahead. It is a figure which shows the pattern of the bottom face of the sole which concerns on other embodiment of this invention.

Hereinafter, the sole of the prosthetic leg of the present invention (hereinafter also referred to as a sole) of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a prosthetic leg 1 for competition equipped with a sole 5 according to the first embodiment of the present invention. The prosthetic leg 1 for competition has a leaf spring-like leg 2 and a sole 5 is attached to a contact area on the tip side. In addition, although illustration is abbreviate | omitted, the base end part of the foot part 2 is connected to a socket via an adapter, and a wearer wears a prosthetic leg by accommodating the stump of a wearer's leg in a socket. be able to. As the adapter and the socket, those corresponding to the stump position of the foot such as a thigh prosthesis and a crus prosthesis are used. FIG. 1 shows the foot 2 and the sole 5 in an upright state of a wearer who wears the prosthetic leg 1 for competition.

Hereinafter, in this embodiment, in the height direction of the prosthetic leg for competition, the side where the foot 2 is connected to the adapter is referred to as the connection side, and the side where the foot 2 contacts the road surface S is referred to as the ground side. Further, the toe T of the prosthetic leg 1 for competition refers to the foremost point where the foot 2 extends from the connection side and terminates.

In this embodiment, the foot portion 2 of the prosthetic leg 1 for competition has a shape extending in a plate shape toward the toe T via at least one curved portion, in the illustrated example, 1 curved portion 3. In FIG. 1, the foot part 2 includes, in order from the connection side to the ground side, a straight part 2 a, a curved part 2 b that is convex toward the toe T side, a curved part 3 that is convex toward the rear side in the foot front-rear direction Y, The curved portion 2c and the grounding portion 4 extending to the toe T side in an arc shape protruding to the grounding side.

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

The grounding portion 4 has, on the grounding side, a contact area 4s extending in an arc shape from the toe T toward the bending portion 3, and a 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 who wears the prosthetic leg 1 performs a straight traveling operation. In the state where the sole 5 is attached, the contact area 4s is the sole 5 It contacts with the road surface S via.

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

The sole 5 has a shape according to the extended shape of the contact area 4s. The grounding side of the sole 5 is a sole bottom surface 5s. As shown in FIG. 1, the sole bottom surface 5s has a shape in which the arcs X1 and X2 are continuous from the toe T side to the bending portion 3 side. In the present embodiment, the arc X1 and the arc X2 have different radii of curvature, but may have the same radius 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 FIG. 2, FIG. 3 and FIG. 4, the sole bottom 5s of the sole 5 of the prosthetic leg for competition according to one 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 width direction land portion 10 defined by a plurality of width direction grooves 20 extending in the W direction, and three rows of width direction land portions 10 in FIG.

FIG. 3 shows the shape of one of the three rows of the widthwise land portions 10. As illustrated, the width-direction land portion 10 includes a wave-like portion 6 that has a shape along a wave line P1 extending in the W direction. The wave here refers to a shape in which substantially the same shape changes phase with substantially the same period, such as a sine wave or unevenness. The width direction land part 10 should just have the land part part extended by predetermined width along such a wavy wave line P1, and in the example of illustration, it is a land part which exhibits a wavy shape over the full width of sole bottom 5s. is there. That is, in the illustrated example, the entire widthwise land portion 10 is a wave-like portion 6.

The effect obtained by making the width direction land part 10 into the shape which has the waved part 6 is as follows. That is, when the wearer who wears the prosthetic leg for competition 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. Therefore, it is required to have an edge component in a direction crossing the Y direction, in other words, in a direction along the W direction. Therefore, the width direction land portion 10 basically has a shape extending in the W direction, thereby giving an edge component in the W direction. Furthermore, by making the width direction land portion 10 corrugated, in addition to the edge component in the W direction, the edge component in the Y direction is also given, and the land portion shape having a higher edge effect as a whole is obtained. The grip force for the road surface S can be increased.

Here, the wavy portion 6 includes a convex portion 6a that protrudes toward the convex side of the peak M1, the toe T side in the illustrated example, and a convex side of the valley V1, from the positions of the adjacent peaks M1 and valley V1 in the wavy line P1. In the illustrated example, it is important to have at least one pair of convex portions 60 with the convex portions 6b projecting 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 portion pair 60 of FIG. In FIG. 4, the convex portion 6 a has an end edge in the Y direction of the waved portion 6 that is bent from the points q1 and q2 where the waved portion 6 extends in the Y direction toward the toe T side in the Y direction. The shape has a reduced direction width. Moreover, the convex part 6b is the same shape as the convex part 6a, and the edge in the Y direction of the wavy part 6 is bent from the extending direction of the wavy part 6 in the Y direction, from the points q1 ′ and q2 ′. It is a shape in which the width in the W direction decreases in the Y direction toward the curved portion 3 side. In addition, if the

convex parts

6a and 6b are the shape which protrudes from the position of the peak M1 and the trough V1 of the wavy part 6 to the toe T side of the Y direction or the curved part 3 side, the width in the W direction decreases as described above. In addition to the shape, the width in the W direction may be constant. For example, it may be an arbitrary shape such as a trapezoidal shape, a shape with rounded corners on the tip side of the trapezoid, a semi-elliptical shape, or a triangle.

By providing the convex portion pair 60 to the wavy portion 6, the edge component of the width direction land portion 10 can be further increased, and the edge effect in both the Y direction and the W direction can be enhanced. Furthermore, by having convex portions on both the toe T side and the curved portion 3 side in the Y direction, the rigidity in the Y direction of the width direction land portion 10 as the entire width direction land portion 10 increases, coupled with the edge effect. The traction performance of the competition prosthetic leg 1 can be sufficiently exhibited. Furthermore, the convex portion pair 60 can give the width direction land portion 10 a shape that effectively cuts a water film existing between the sole bottom surface 5s and the road surface S on both sides in the Y direction. It demonstrates performance and prevents slipping.

The convex portion 6a in FIG. 4 is a virtual extending in the Y direction through the mountain M1, with the side of the virtual line connecting the points q1 and q2 being the bottom D1, the side parallel to the bottom D1 and the side on the toe T side being the bottom U1. The trapezoid 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 in the Y direction, and the points q1 ′ and q2 The side of the imaginary line segment connecting ′ is the bottom D1 ′, and the side parallel to the bottom D1 ′ is the side of the curved portion 3 is the bottom U1 ′. The line is symmetrical with respect to the imaginary line b2 extending in the Y direction through the valley V1. A trapezoidal shape.

The trapezoidal

convex portions

6a and 6b will be described in further detail using the convex portion 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 along the trapezoidal leg to the toe T side and a virtual line segment L2 extending from the point q2 along the trapezoidal leg toward the toe T side. It is preferable that the length l1 in the W direction of the bottom U1 is greater than 5 ° and less than 60 °, and is 0 mm or more and less than 7 mm. By adopting the above-described configuration, the rigidity of the

convex portions

6a and 6b is increased, and further, drainage performance that effectively drains water existing between the sole bottom surface 5s and the road surface S on the wet road surface is also exhibited. be able to.

In addition, the

convex parts

6a and 6b can also be made into a semi-elliptical shape as shown in FIG. In FIG. 5, the widthwise land portion 10 has a wavy portion 6 having a shape along a wavy wavy line P <b> 1 extending in the W direction, and the

convex portions

6 c and 6 d are half on the toe T side or the curved portion 3 side in the Y direction. It is a shape protruding in an elliptical shape.

Furthermore, as shown in FIG. 4, the imaginary line segment L3 connecting the tips c1 and c2 of the

protrusions

6a and 6b in the protrusion pair 60 is an acute angle angle with respect to the W direction, in the illustrated example, the imaginary line segment. The acute angle θ1 formed by L3 and the line segment L4 extending in the W direction 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 point of the bottom U1 of the trapezoidal

convex portions

6a and 6b in the W-direction length l1 in the illustrated example. In addition, when the

convex parts

6a and 6b have sides along the W direction such as the trapezoidal shape in the illustrated example, the center point of the side is referred to as the tip, but the most protruding point such as 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 a point c3, and the most protruding point of the convex portion 6b is a point c4.
By setting the angle θ1 to 30 ° or more, the drainage performance of the width direction land portion 10 can be sufficiently exerted, and by setting the angle θ1 to 55 ° or less, the width direction land portion 10 centering on the

convex portions

6a and 6b. Support is realized and rigidity can be increased.

In addition, the angle on the acute angle side with respect to the W direction in the extending direction of the width direction land portion 10, in the illustrated example, the angle θ2 on the acute angle side with respect to the line segment L5 in which the wavy line P1 extends in the W direction is 0.35 or more and 2.16 or less. By setting it as such a numerical value range, the rigidity and drainage performance of the width direction land part 10 can be made compatible. The ratio θ2 / θ1 is preferably 0.45 or more and 0.9 or less, and more preferably 0.655.

The width direction maximum length w1 of the sole 5 is not less than 5 times and not more than 25 times 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. It is preferable. By setting the sole width direction distance w2 to be not less than 5 times the width direction maximum length w1, it is possible to impart sufficient rigidity to the sole bottom surface 5s and improve the traction performance. Moreover, by making it 25 times or less, the flexibility in the W direction of the sole bottom surface 5s can be prevented from being lost.
Preferably, the length w1 is not less than 8 times and not more than 10 times, more preferably 9 times the distance w2.

In addition, it is preferable that the width direction maximum length w1 of the sole 5 is 6 cm or more and 15 cm or less. The preferred range varies depending on the height, width, weight, etc. of the prosthetic leg wearer, but is generally 8 cm to 10 cm, more preferably 8 cm for competition.

Moreover, it is preferable that 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 6 mm or more and 20 mm or less. By setting the distance w2 to be 6 mm or more, it is possible to secure an interval between the

convex portions

6a and 6b and prevent the flexibility of the sole bottom surface 5s in the W direction from being lost. Furthermore, by making it 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. It 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 except for the

convex portions

6a and 6b between the mountain M1 and the valley V1 of the wavy line P1. Refers to the length orthogonal to the direction. Note that the length v1 may be a length at an arbitrary position when the width of the width-direction land portion 10 excluding the

convex portions

6a and 6b is uniform, but when the width v1 is not uniform, the length v1 Refers to the average of the minimum length.
Sufficient rigidity can be given to the width direction land part 10 by making length y1 of the width direction land part 10 larger than length v1.

The length v1 perpendicular to the extending direction of the width direction land portion 10 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 it as such a numerical value range, sufficient rigidity can be given to the width direction land part 10.
More preferably, it is 0.2 times or more and 0.6 times or less.

In addition, it is preferable that the length v1 of the width direction land part 10 shall be 1.0 mm or more and 6.5 mm or less, More preferably, it is 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.

Moreover, it is preferable that the width direction land part 10 includes 3 to 10 pairs of convex part pairs 60. By including three or more pairs, sufficient rigidity can be imparted to the widthwise land portion 10 and the traction performance can be improved. Moreover, by making it 10 pairs or less, it is possible to prevent loss of flexibility in the W direction of the sole bottom surface 5s.

FIG. 6 is a diagram showing variations of 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 this embodiment, both side walls facing the width direction groove 20 of the width direction land portion 10 have a shape in which straight lines inclined with respect to the W direction are continuous. The

convex portions

6e and 6f also have a shape that forms an acute angle by combining straight lines inclined with respect to the W direction. By adopting such a configuration, it is possible to prevent slipping when the artificial leg 1 for competition is used on a wet road surface or the like while exhibiting the traction performance. That is, the width direction land portion 10 can be given a shape that effectively cuts a water film between the sole bottom surface 5s and the road surface S on both sides in the Y direction, and exhibits high drainage performance. Slipping can be prevented.

Next, with reference to FIG. 7A, 7B, 7C, 7D and FIG. 2, the suitable arrangement | positioning and number of the width direction land parts 10 are demonstrated.

FIG. 7A, FIG. 7B, FIG. 7C, and FIG. 7D explain step by step the operation of the foot portion 2 and the ground contact surface 5s when the wearer who wears the prosthetic leg 1 for competition travels straight ahead. FIG. The upper part of each drawing is a side view of the foot 2 and the sole 5, and the lower part of each drawing is a grounding form of the sole bottom surface 5s when the wearer wearing the competition artificial leg 1 performs a straight running operation. It shows the transition.

That is, FIG. 7A shows a state in which the competition prosthetic leg 1 lifted by the wearer is lowered onto the road surface S and the overall weight is loaded on the competition prosthetic leg 1. As shown in the lower part of the drawing, when the prosthetic leg 1 is lowered onto the road surface S, the contact area of the sole bottom surface 5s is in the vicinity of the center of the bottom surface. It is a region that is spaced in the direction.

FIG. 7B shows a state in which the wearer has stepped forward from the state of FIG. 7A while the overall weight is loaded on the prosthetic leg 1 for competition. In the case of a healthy person's running, it is common to step on the ground in order from the heel side to the toe side of the shoe sole to be grounded first, but the prosthetic leg for competition 1 is more curved than where it was grounded first. The grounding area has moved to the part 3 side.

FIG. 7C shows a state in which the wearer swings forward the opposite leg to the side on which the athletic prosthetic leg 1 is worn and starts to kick out the athletic prosthetic leg 1. When this kicking-out operation is started, the game prosthetic leg 1 is grounded in the region on the toe T side of the sole bottom surface 5s from the region shown in FIGS. 7A and 7B.

FIG. 7D shows a state immediately before the wearer kicks out the prosthetic leg 1 for competition, just before leaving the road surface S. In order to kick out from the toe T on the bottom surface 5s of the sole, the grounding is made in the region closer to the toe T than FIG. 7C.

7A, 7B, 7C, and 7D, in order to make the traction performance of the prosthetic leg 1 easier to exhibit, the inventor can change the above-mentioned width direction land portion 10 to FIG. 7B. It was conceived that it is effective to arrange in the grounding region on the bending portion 3 side from the first grounded position shown in FIG. That is, the ground contact area shown in FIG. 7B is an area where the stepping motion is performed in a state where the overall weight is loaded on the prosthetic leg 1 for competition after the wearer first lands. By arranging the width direction land portion 10 in such a region, a high edge function can be imparted to this region, a gripping 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 the width direction land portions 10 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 enhanced.

In addition, in the sole bottom surface 5s, the configuration other than the width direction land portion 10 is arbitrary, and other land portions 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 moved from the row 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 land portion width is smaller than that of the width direction land portion 10. The region in which the width direction land portion 11 is arranged corresponds to the ground contact region shown in FIG. 7A above. That is, the competition prosthetic leg 1 lifted by the wearer is lowered onto the road surface S, and the overall weight is loaded on the competition prosthetic leg 1. Here, it is important that the region is sufficiently gripped with the road surface S so that the balance of the entire body is maintained even when the wearer applies the total weight to the prosthetic leg 1 for competition. By disposing the width direction land portion 11 having a land portion width smaller than the width direction land portion 10 in such a region, the drainage function is effectively exhibited along the Y direction, and the grip force with the road surface S is sufficient. To prevent the prosthesis from slipping, that is, to improve the anti-slip performance.

The width direction land portion 12 extends substantially in a wave shape in the W direction, and the land portion width is a repetition of wide and narrow, from the width direction extension portion 12a and a bent portion bent in a direction protruding toward the toe T side, Extension of the width direction extension part 12a from the toe side protruding part 12b extending so as to be convex in the direction in which the width direction extension part 12a extends and the bending part bending in the direction of protrusion on the bending part 3 side It is a shape including the curved part side protrusion part 12c extended so that it may become convex in the direction to do.

The region in which the width direction land portion 12 is arranged is a region to be grounded when the kicking-out operation of the prosthetic leg 1 for competition shown in FIG. 4C is started. By adopting a shape in which the land portion width changes, drainage performance can be improved while increasing the land portion rigidity. In other words, it is possible to avoid slipperiness caused by increasing the land portion width while increasing the land portion width by adopting a shape in which a portion having a relatively large land portion width and a small portion coexist. it can.

In addition, 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 preferred. In the region where the sipe 13 is arranged, as shown in FIG. 7D, the wearer swings forward the foot opposite to the side on which the prosthetic leg 1 is worn and performs the kicking operation of the prosthetic leg 1 for the competition. It is an area. This region is a region where wear tends to progress particularly because the region is grounded in order toward the toe T and the wearer touches and slides the road surface S on the sole bottom surface 5s. Therefore, in this region, it is important to improve the wear resistance and maintain the resistance to slipping during ground contact.

In particular, the constant region from the edge of the sole bottom surface 5s on the toe T side where the sipe 13 is formed is a region corresponding to the arc X1 continuous with a constant curvature radius from the toe T in FIG. As shown in 7D, when the wearer wearing the competition prosthetic leg 1 performs the kicking-out operation, the wearer tends to come into contact with the ground at the end to cause more severe wear. Therefore, in this region, it is necessary to provide particularly high wear resistance. Therefore, the sipe 13 having a width smaller than that of the groove formed in another region is formed, and the edge component is distributed without impairing the rigidity. Therefore, the sole bottom surface 5s can be protected from intense wear, and the service life of the foot 2 itself can be extended.

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

1: prosthetic leg for competition, 2: foot part, 2a: straight part, 2b, 2c: curved part, 3: curved part, 4: grounding part, 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 direction extending portion, 12b: toe side protruding portion, 12c: curved portion side protruding portion, 20: width direction groove, 51s: sole bottom surface, 101: width direction land portion, 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 the toe T side to the curved portion 3 side Extending direction, W: Sole bottom surface 5s orthogonal to Y direction Width direction

Claims

A sole to be attached to a contact area extending in an arc shape from the toe to the curved portion side of the athletic prosthesis having a leaf spring-like foot portion extending to the toe side through at least one curved portion,
The sole has a bottom surface shaped according to the extending shape of the contact area,
The bottom surface has at least one width direction land portion defined by a plurality of width direction grooves extending in the width direction of the sole,
The width direction land portion has a wavy portion that exhibits 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 to the convex side of the mountain and a convex portion protruding to the convex side of the valley from the position of each of the adjacent peaks and valleys in the wavy line. Characteristic prosthetic sole for competition.
2. The sole of the prosthetic leg for competition according to claim 1, wherein an angle on an 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 maximum length of the sole in the width direction is 5 to 25 times the distance in the sole width direction between the tips of the protrusions in the pair of protrusions. Sole.
The width direction land portion has a length in the extending direction of the sole passing through a tip of the convex portion, which is larger than a length orthogonal to the extending direction of the width direction land portion. The sole of the described artificial leg for competition.
The sole of the prosthetic leg for competition according to any one of claims 1 to 4, wherein the land portion in the width direction includes the pair of convex portions of 3 to 10 pairs.
The sole of the prosthetic leg for competition according to any one of claims 1 to 5, wherein the land in the width direction has zigzags on both side walls facing the groove in the width direction.