JPH0884605A - Sneaker's sole - Google Patents

Abstract

PURPOSE: To provide a sneaker's sore which can enhance an impact shock absorbing effect of a landing impact most easily receiving part. CONSTITUTION: A shock absorbing member 8 which is almost equal to a shape of a through hole 2 and has an outside diameter almost larger than an inside diameter of this through hole 2 and has hardness different from a raw material of a shoe sole body 1, is fitted in the through hole 2 which is formed on the heel side of the shoe sole body and in which an annular locking part 2b is protrusively arranged on an inner peripheral wall, so as to be freely mountable and demountable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an athletic shoe sole suitable for wearing in an athletic competition involving a jump with a large landing impact such as volleyball or basketball competition.

[0002]

2. Description of the Related Art In sports shoes, the sole of the shoe usually has a good shock absorbing property in order to protect the foot from the impact received when landing during exercise. Various types of athletic shoe soles having such a good shock absorbing property have been proposed in the past, but as an example of shoes aiming at mainly mitigating a portion susceptible to a landing impact, a grounding portion other than the arch portion has been proposed. It is known that an elastic plate is directly fixed to.

Although this athletic shoe sole can produce a shock absorbing effect on the toe side and heel side almost entirely, it has a drawback that the cushioning effect varies depending on the weight of the wearer. In view of this difficulty, the present inventors have previously proposed an athletic shoe sole having a different cushioning effect depending on the weight of the wearer (Japanese Utility Model Publication No. 62-41601). In this structure, a through hole or a recessed fitting portion is provided at a desired portion of the shoe sole where the impact at the time of landing is large, while an elastic projection is provided on the base portion of the midsole side. Then, the elastic projection is detachably fitted into the through hole or the concave fitting portion to form the shoe sole.

As a result, there is a hardness difference between the shoe sole member and the elastic projection, and the elastic projection is attachable to and detachable from the through hole or the concave fitting portion. It becomes possible to buffer without being interrupted. Therefore, shock absorbing action is enhanced, and when applied to volleyball shoes, basketball shoes, etc., bruising, spraining,
It is possible to prevent the occurrence of various running disorders such as meat stings and bruises (so-called meat separation), and to obtain a comfortable wearing feeling.

[0005]

However, in the above-mentioned conventional sports shoe sole, since the elastic protrusion is integrated with the base portion of the midsole, and this elastic protrusion is not a completely independent structure, The degree of freedom in deformation and contraction was restricted to that extent, and the cushioning effect was reduced when a landing impact was received, and the impact effect had a certain limit.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an athletic shoe sole capable of further enhancing the shock absorbing effect of a portion most susceptible to a landing shock.

[0007]

In order to achieve the above object, the invention according to claim 1 is a transparent body formed on the heel side of a shoe sole main body and having an annular locking portion protruding from the inner peripheral wall. It is characterized in that a cushioning member having a diameter substantially equal to the shape of the through hole, an outer diameter substantially larger than the inner diameter of the through hole, and a hardness different from that of the material of the sole body is detachably fitted into the hole.

According to the second aspect of the present invention, the shape of the through hole is substantially formed in the through hole formed on the heel side of the shoe sole body and having the annular locking portion protruding from the inner peripheral wall. A cushioning member having an outer diameter that is substantially larger than the inner diameter of the through hole and having an air circulation portion that communicates with the lower surface side and the upper surface side, and that has a hardness different from that of the material of the sole body is detachably inserted. Is characterized by.

According to the third aspect of the present invention, the shape of the through hole is formed in the through hole formed on the heel side of the shoe sole main body and having an annular locking portion protruding from the inner peripheral wall. It is characterized in that at least two or more cushioning members having an outer diameter that is substantially larger than the inner diameter of the through hole and a hardness different from the material of the shoe sole body are detachably fitted.

[0010]

In the invention according to claim 1, a shock absorbing member having a hardness different from that of the material of the shoe sole body is detachably inserted into the through hole formed on the heel side of the shoe sole body. When receiving the impact, the impact member expands and contracts up and down independently of the shoe body. Further, since the annular locking portion projecting on the inner peripheral wall of the through hole and the annular concave portion formed on the outer peripheral wall of the cushioning member are in the engaged state, the cushioning member is not affected by the landing impact. It is prevented from coming out of the through hole.

According to the second aspect of the present invention, the cushioning member has substantially the same shape as the through hole and the outer diameter is substantially larger than the inner diameter of the through hole. When the cushioning member is fitted into the through hole at the lower portion, the internal air escapes from the lower surface side of the cushioning member to the upper surface side through the air circulation portion.

According to the third aspect of the present invention, at least two or more cushioning members are removably fitted in the through holes, and the hardness of these cushioning members is made different from each other, so that the landing impact is stepwise. Can be buffered.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a charge material for sports shoe soles according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the charge material provided with through holes, and FIG. 3 is a plan view of the charge material.

This athletic shoe sole 1 is applied to sports shoes such as volleyball shoes and basketball shoes. After the sole material to be the main body of the sole is skived to obtain the charging material 1A, it is heated and compressed. The midsole 1B (FIGS. 7 and 8) is molded, and the cushioning member 8 (FIG. 9) is arranged on the heel portion 1a side of the midsole.

As a material for the sole, EVA (vinyl chloride acetate), a styrene-butadiene rubber, a synthetic rubber sponge, and a base material prepared by synthesizing natural rubber are used, and the base material is formed into a flat original plate. After processing this original plate,
The material 1A is obtained by cutting into a shoe sole shape. The charging material 1A has an upper surface 1 and a lower surface 1 as shown in the cross section of FIG.
b and 1c are flat, and edge parts 1d and 1 are provided on both sides of the upper end of the heel part 1a.
e is extended and a recess 1f is formed on the lower surface 1c side.

Then, the heel portion 1a of the charging material 1A is first provided with a through hole 2 for fitting a buffer member 8 described later. In this example, the through hole 2 has a circular shape with a diameter of 35 mm. However, when punching formation was attempted by the conventionally well-known punching, the upper and lower inner peripheral edges of the opened through hole were determined because the EVA had elasticity. It was not possible to perform straight cutting due to irregular deformation or unevenness on the inner peripheral wall of the through hole.

Therefore, the inventors of the present invention decided to use a water jet, and when cutting was performed from the upper surface 1b to the lower surface 1c of the charging material 1A by water jet injection, as shown in FIG. The peripheral edge and the inner peripheral wall 2a can be cut straight, and the excellent through hole 2 can be formed. When the transparent resin plate 3 is adhered to the previously provided recess 1f after forming the through hole 2 in this way, the charging material 1A has a plan view as shown in FIG.

Next, an annular locking portion 2b (FIGS. 9 and 10) for preventing the buffer member 8 from coming off is formed in the through hole 2 of the charging material 1A. At this time, the nest 4 as shown in FIGS. 4 and 5 is prepared. The insert 4 has a substantially cylindrical shape whose outer shape is substantially equal to the inner diameter of the through hole 2, and is made of a metal material. On the outer peripheral surface 4c of the insert 4, four vertical grooves 4d reaching the upper and lower surfaces 4a, 4b are equally spaced, and a concave lateral groove 4e is provided on the lower side. In addition, the hollow hole 4f extends from the center of the upper surface 4a toward the lower surface 4b halfway.
And a communication hole 4g reaching the vertical grooves 4d from the lower side of the hollow hole 4f.

As shown in FIG. 6, the insert 4 is inserted into the through hole 2 of the charging material 1A, and then the charging material 1A is put into the molding mold 5 and mold setting is carried out. Mold the midsole 1B. As shown in FIG. 7, the molding mold 5 includes an upper mold 6 and a lower mold 7, and the upper mold 6 is formed in a substantially convex shape and the lower mold 7 is formed in a substantially concave shape. Pointed notches 6a and 6b are provided on both left and right sides of the upper mold 6, and an air vent hole 6c is formed in the center of the insert 4 facing the hollow hole 4f. The left and right side walls 7a and 7b of the lower mold 7 are each formed in a wave shape.

When the midsole 1B is molded with this molding mold 5, the molding mold 5 is heated in advance and the lower side of the charging material 1A is inserted into the lower mold 7. Then, the upper mold 6 is moved downward to apply pressure to gradually tighten the charging material 1A. At this time, the air remaining between the transparent resin plate 3 and the through hole 2 is guided from the vertical groove 4d to the communication hole 4g, flows into the air vent hole 6c through the hollow hole 4f, and then is blown out of the upper mold 6. Is discharged to the person. Further, the air existing between the inner peripheral wall 2a of the through hole 2 and the outer peripheral surface of the insert 4 is also discharged outward from the vertical groove 4d through the hollow hole 4f and the air vent 6c.

In this way, the charging material 1A is heated and pressurized while being tightened, the upper mold 6 is joined to the lower mold 7 as shown in FIG. 8, and then the molding mold 5 is released to form the midsole 1B. To be done. The midsole 1B is finished by removing burrs and the like, but a characteristic feature of the EVA material is that a thin film is formed on the surface. Further, in the midsole 1B, the through hole 2 is formed in the center of the heel portion 1a by removing the nest 4. This through hole 2
Is equal to the outer shape of the nesting 4, so as shown in FIG.
A projecting annular locking part 2b is provided on the bottom part near the transparent resin plate 3, and four longitudinal projecting parts 2c are formed on the inner wall circumference 2a.

A buffer member 8 is removably fitted in the through hole 2. As the buffer member 8, two members, a solid member 9 having a hardness different from that of the charging material 1A and a gel substance 10, are used. In this example, the durometer hardness is 60 to 6
5 to the charging material 1A, the solid member 9 hardness 50 ~ 55
As the gel-like substance 10, one having a lower hardness was adopted.

The buffer member 8 has an outer diameter of the through hole 2.
The diameter is formed to be substantially larger than the inner diameter of the. That is, the diameter difference between the two is 1 to 1.5 mm. The fixing member 9 has a substantially columnar shape, and has a thickness equal to the height from the upper surface of the midsole 1B to the annular locking portion 2b of the through hole 2 and faces the protruding portion 2c of the through hole 2 and the outer peripheral surface thereof. Is provided with a vertical groove 9a.
The gel substance 10 is substantially disc-shaped and has a thickness equal to the height from the transparent resin plate 3 to the annular locking portion 2b of the through hole 2, and a through hole 10a having a large diameter downward is formed at the center. I have set up.

When these cushioning members 8 are fitted into the through holes 2, first, the gel substance 10 is inserted, and then the solid member 9 is inserted. At this time, the gel material 10 has a through hole 10
Since the solid member 9 is provided with the vertical groove 9a, the transparent resin plate 3 closes the lower portion of the through hole 2a.
When it is fitted inside, the remaining air escapes through the through hole 10a. Further, since air also escapes from the air circulation portion 2d formed between the vertical groove 9a and the inner peripheral wall 2a of the through hole 2, even if each buffer member 8 has a diameter larger than the inner diameter of the through hole 2, it is easy. Can be inserted. Further, when it is necessary to replace them, they can be easily pulled out from the through hole 2. Therefore, the work of attaching and detaching the cushioning member 8 is facilitated.

When the two cushioning members 8 are fitted in the through holes 2 in this manner, the two members 9 and 10 are arranged in two layers vertically, as shown in the sectional view of FIG. As shown in the figure, the solid member 9 is the heel portion 1a of the midsole 1B.
It will be in a state of being arranged flush with the center of.

As described above, when two buffer members 9 and 10 are used, the hardness of the solid member 9 and the gel-like substance 10 is lower than that of the charging material 1A. 9 may have a hardness higher than that of the charging material 1A. Further, only one buffer member 8 may be fitted in the through hole 2, and in this case, the solid member 9 having a hardness lower than that of the charging material 1A is used. The fixing member 9 also has an outer diameter larger than the inner diameter of the through hole 2, but preferably has the same shape as the nest 4.

As shown in FIG. 12, the midsole 1B having the cushioning member 8 disposed on the heel portion 1a is moved by bonding the ground bottom 11 to the lower surface and the substrate portion 12 to the upper surface. It is formed as a sole 1. In order to compare the shock absorbing property with the conventional example, the sports shoe sole 1 was subjected to a performance test at the time when the midsole 1B was manufactured, and a good result was obtained. In this performance test, the midsole 1B is placed on the upper surface of the weight measuring machine, and the gravity acceleration G is measured by dropping the weight from a certain height. As a comparative example, the midsole of the same material as this example is used. 11B was used.

That is, as a comparative example, two types are prepared as shown in FIGS. 13 and 14, and the midsole 11B of each comparative example is set so that the three parties including this example have the same conditions as much as possible. A concave portion 12a having an inner diameter equal to that of the through hole 2 is provided on the upper surface 11a side of the heel portion, and a concave portion 12 having a larger diameter than the concave portion 12a.
b and respectively were formed. In the first comparative example of FIG. 13, the concave portion 12a is provided on the upper surface 1a of the heel portion, and in the second comparative example of FIG. 14, the concave portion 12a and the concave portion 12b are provided on the lower surface 11b of the heel portion. Then, a solid member 13 of the same material as the solid member 9 of the present example is adhered to each concave portion 12a, and a gel substance 14 of the same material as the gel substance 10 of the present example is also adhered to each recess 12b. did.

As a result of measuring these, the gravitational acceleration was 13 G in both the first and second comparative examples.
In this example, the measured value was 10 G, and it was revealed that the buffering property was remarkably improved. This means that, as described above, it is preferable that the cushioning member 8 provided on the heel portion is not bonded to the inside of the through hole 2 and can be moved up and down, and that the cushioning member 8 moves up and down when receiving a landing impact. Even if it expands and contracts, the cushioning member 8
Through hole 2 to prevent the
It has been shown that it is preferable to provide the annular locking portion 2b in the inside to restore it to a fixed position. .

In the above embodiment, the annular engaging portion 2b is provided in the through hole 2, but the annular engaging portion is provided on the outer peripheral surface of the buffer member 8 so that the annular engaging portion 2b is provided on the through hole 2 side. It may be configured to form a groove. Also, on the heel portion 1a of the midsole 1C,
While forming the hexagonal through-hole 2 as shown in FIGS. 15 and 16, the buffer member 8 has a star-shaped gel-like shape 1.
0b may be used, and the gel substance 10b may be removably fitted into the through hole 2. Further, it goes without saying that the through hole 2 may have a polygonal shape, an elliptical shape, or the like, and the buffer member 8 that fits inside the through hole 2 may be fitted.

[0031]

As described above, according to the first aspect of the invention, when the sole body receives a landing impact, the cushioning member vertically expands and contracts independently of the sole body to absorb the impact. The shock absorbing effect on the heel side that receives the strongest landing impact is enhanced. Further, since the buffer member is held in the through hole in a state where the annular locking portion and the annular recess are engaged with each other and is prevented from coming out when a landing impact is received, the buffer member does not use an adhesive or the like. There is also an advantage that the production of the shoe sole main body can be simplified.

According to the second aspect of the present invention, since the cushioning member has the air circulating portion, when the cushioning member is fitted into the through hole whose lower part is closed, the air inside the air circulating portion is closed. Since the cushioning member is pulled out from the lower surface side to the upper surface side, the work of fitting the cushioning member into the through hole having a diameter smaller than that of the cushioning member becomes easy.

According to the third aspect of the present invention, at least two cushioning members having different hardness are detachably fitted in the through hole so that the landing impact can be damped stepwise. This has the effect that the shock absorbing effect can be enhanced more accurately.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a charging material for sports shoe soles according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a charge material having a through hole formed in a heel portion.

FIG. 3 is a plan view of the same charging material.

FIG. 4 is a perspective view of a nest inserted into a through hole.

FIG. 5 is a plan view of the nest.

FIG. 6 is an explanatory view showing a state where a nest is inserted into a through hole.

FIG. 7 is an explanatory diagram showing a state in which a charging material is pressure-molded.

FIG. 8 is an explanatory view showing a state in which the midsole is molded.

FIG. 9 is an explanatory view showing a state in which a cushioning member is fitted in a through hole of the midsole.

FIG. 10 is an explanatory view showing a state where a cushioning member is fitted in the through hole.

FIG. 11 is a plan view of a sports shoe sole having a cushioning member fitted in the through hole.

FIG. 12 is a partial cross-sectional side view of an athletic shoe provided with the athletic shoe sole of this embodiment.

FIG. 13 is a cross-sectional view of a midsole in which a cushioning member according to Comparative Example 1 is bonded to a concave portion.

FIG. 14 is a cross-sectional view of a midsole in which a cushioning member according to Comparative Example 2 is bonded to a concave portion.

FIG. 15 is a plan view of a midsole in which a cushioning member according to another embodiment is fitted without a through hole.

FIG. 16 is a bottom view of the midsole according to the embodiment.

[Explanation of symbols]

 1 shoe sole body 1a heel part 2 through hole 2a inner peripheral wall 2b annular locking part 8 cushioning member

Claims (3)

[Claims] 1. A through hole formed on the heel side of a shoe sole body and having an annular locking portion projecting from an inner peripheral wall, has an outer diameter substantially equal to the shape of the through hole and an outer diameter smaller than an inner diameter of the through hole. An athletic shoe sole, wherein a cushioning member having a substantially large diameter and a hardness different from that of the material of the shoe sole body is detachably fitted. 2. Inside the through hole formed on the heel side of the shoe sole main body and having an annular locking portion projecting from the inner peripheral wall, the outer diameter is substantially equal to the shape of the through hole and the outer diameter is smaller than the inner diameter of the through hole. Also, an athletic shoe sole having a substantially large diameter, an air circulation portion communicating with the lower surface side and the upper surface side, and a cushioning member having a hardness different from that of the material of the sole body is detachably fitted. 3. A through hole formed on the heel side of the shoe sole main body and having an annular locking portion projecting from the inner peripheral wall, has an outer diameter substantially equal to the shape of the through hole and an outer diameter smaller than the inner diameter of the through hole. An athletic shoe sole characterized in that at least two cushioning members having a substantially large diameter and a hardness different from that of the material of the sole body are detachably fitted.