JPH0144085Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention mainly relates to improving the soles of athletic shoes suitable for jogging, marathon running, etc. The present invention relates to athletic shoes that can prevent lateral movement of the heel portion from side to side when landing, and can effectively cushion the impact of landing.

<Conventional technology> Conventionally, in jogging shoes and running shoes, a hard elastic member is disposed at the inner edge of the heel, for example, as a shoe with a structure that prevents overpronation. A technology for a shoe sole consisting of a midsole and an outsole (Japanese Patent Application Laid-open No. 49101/1983) is well known. In other words, overpronation (overpronation) is when the heel of the foot sinks significantly inward during the series of footwork during running, from landing to kicking, causing the joints of the talus and calcaneus to bend in a dogleg shape. This refers to the phenomenon in which the so-called inward rotation (twisting and strain) of the ankle occurs. When such overpronation occurs, it places a strain on the knee joint in particular, causing a number of problems. This is a so-called running disorder, and it is said that most of the problems are caused by overpronation. Therefore, this known technology does not achieve the intended purpose by providing a hard elastic member on the inner edge of the heel of the midsole to prevent overpronation, thereby preventing the heel from sinking into the inner side. That is. Incidentally, experimental data has proven that this overpronation phenomenon occurs frequently at the time when the weight is 8 parts on the heel and 2 parts under the ball of the foot, that is, immediately after landing on the heel.

<Problems to be solved by the invention> By the way, with the conventional product mentioned above, it is possible to prevent the heel from sinking inward, but when a landing impact equivalent to about three times the body weight is applied to the heel. On the contrary, the heel part tends to shift toward the soft outer side, causing what is called a lateral heel wobbling phenomenon, and there is a risk that the stability of the heel part will be lost during running. This lateral movement of the heel from side to side places stress on the ankle and knee joints, and especially during long-distance running such as marathons, repeated lateral movement can cause an imbalance in running and lead to early fatigue. It is.

<Means for solving the problems> The present invention overcomes the defects of the conventional products, and was developed as a result of intensive research to solve the overpronation and lateral wobbling of the sole. It is ivy. That is, the present invention has a sole material that extends from the non-stepped side of the sole to the rear end of the heel and is divided into three parts in the longitudinal direction, that is, the vertical direction, and the sole member on the inner side of the sole is divided into three parts. A hard elastic member with a hardness of 60 to 70 degrees is used, and the bottom member 4 on the outer side is an elastic member with a lower hardness (approximately 50 to 60 degrees) than the bottom member on the inner side. The sole member on the central side surrounded by the sole member is an elastic member with a hardness of about 40 to 50 degrees, and the sole member on the central side has a trajectory indicating the movement of the weight of the shoe wearer when landing. The shoe has a mid-sole which is formed to have a constant width from the rear edge of the heel slightly outward to the non-stepping area along the center line of the heel of the sole. This is a new configuration.

<Function> Therefore, according to the present invention, the bottom member made of a hard elastic member on the inner side prevents the heel from sinking, while the shift of the heel toward the other side is prevented by using the bottom member made of a hard elastic member on the inner side. The shoe is supported by an elastic member, and a low-hardness sole member with good cushioning properties is placed along the trajectory of weight movement to prevent lateral heel wobbling.

<Example> The present invention will be explained according to an example shown in the drawings. FIG. 1 is a rear view and a side view of an athletic shoe equipped with a midsole A of the present invention. The athletic shoes are made up of a sole consisting of an outsole B and a midsole A joined to the upper part of the outsole, and a lace part joined to the sole. FIG. 2 shows a midsole A of the present invention, which is provided with bottom members 3, 4, and 5 that extend from the non-stepping side 1 to the rear end 2 of the heel and are divided into three parts, In each of the bottom members 3, 4, and 5 of the midsole A, first, the bottom member 3 on the inner side A is made of a hard elastic member, and the bottom member 4 on the outer side B is made of an elastic member with a slightly lower hardness. The bottom member 5 on the central side C surrounded by these inner and outer sides is configured to be an elastic member with the lowest hardness. Among the bottom members of the mid-sole A constructed in this way, the material of the bottom member 5 disposed on the central side C is an elastomer with a hardness of about 40 to 50 degrees, and is made of foam that is lightweight and has good cushioning properties. Ethylene vinyl acetate copolymers are usually used. Next, the bottom member 3 disposed on the inner side A is required to be an elastic member with high hardness that can prevent the heel from sinking excessively into the inner side when the wearer lands on the ground. rubber, styrene butadiene rubber, butadiene rubber,
An elastomer such as acrylnitrile-butadiene rubber, high styrene resin, or a mixture of two or more thereof is used, preferably having a hardness of about 60 to 70 degrees.

Next, the bottom member 4 on the outer side (B) is made of the same material as the bottom member 3 on the inner side (A) described above.
In other words, the bottom member 4 on the outside side 4 prevents the heel from shifting toward the outside side 2 as a reaction of the bottom member 3 on the inside side against the external force caused by excessive pronation, and prevents extreme compressive deformation of this side. The hardness is approximately 50 degrees to 60 degrees to prevent discomfort in the heel area. As shown in FIG. 3, the sole member 5 on the central side C is formed into a fan-like or fan-like spread 6 at the rear end of the heel, and the center point 7 of the spread 6 is the center line of the sole. It is formed slightly closer to the outer side than 8. In other words, during the series of footwork from landing to kicking, the trajectory indicating the weight shift of the wearer is at an angle of approximately 5 degrees when the center line of the sole is set at 0 degrees at the time of landing, as shown in Figures 3 and 4. It is located near the outside edge, and as the weight moves forward, it follows a trajectory that gradually moves to the center of the sole. Therefore, according to the present invention, a sole member 5 with good cushioning properties is formed along the trajectory of weight movement during a series of footworks, and a heel is provided to take advantage of shock absorption over a wider range at the time of landing. The rear end 2 is formed into a fan-like extension 6.

Next, another specific example of the present invention will be explained based on the drawings. Fig. 3 shows a midsole A formed in multiple layers. ,4,5
This figure shows a midsole A' which has the properties of each of the above, and further has another midsole A' having good cushioning properties bonded to the lower part of the midsole. In this type of shoe, the landing impact from the outsole B is partially absorbed by the lower midsole A', which acts as a buffer, preventing the sole members 3, 4, and 5 from becoming prematurely flattened, and also absorbing the landing impact from the entire sole. It is something that can be used effectively. Of course, in the present invention, it is desirable to use midsole A' having various hardnesses and thicknesses in addition to those described above.

<Effects of the invention> Therefore, according to the invention, first, the bottom member 3 disposed on the inner side A of the midsole A prevents the heel from sinking excessively into the inner side A when landing (overpronation). At the same time, it is possible to prevent the heel from shifting toward the outer side, thereby avoiding the so-called lateral wobbling phenomenon. In addition, the bottom member 5 in the center part receives at least the heel side where the landing pressure is strongest, thereby more effectively cushioning the impact, and stabilizes the bottom member 5 by appropriately sinking the bottom member 5. This greatly contributed to well-balanced driving. In summary, the present invention eliminates overpronation and lateral wobbling, and can limit the loss of kinetic energy due to lateral wobbling to the maximum extent, and is of extremely high practical value for marathons and jogging.

[Brief explanation of the drawing]

The drawings show typical embodiments of the present invention, and FIG. 1 and FIG. 1 are rear views and side views of an athletic shoe equipped with the midsole of the present invention, respectively. FIG. 2 shows the midsole; is a plan view thereof, is a side view thereof, and is a rear view thereof. FIG. 3 is a side view and a back view showing the same modified midsole;
is a perspective view seen from the back side thereof. FIG. 4 is a diagram showing the trajectory of weight movement. Reference numbers in the drawings: A...Mitsudosole, A'...Mitsudosole, B...Outsole, 1...Non-stepping side, 2...Rear end of heel, 3...Bottom member on the medial side, 4...
...Bottom member on the outer side, 5...Bottom side on the center side, 6
... Spread, 7... Center point, 8... Center line, I...
...inner side, ro...outer side, c...center side.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A sole member 3 extending from the unstepped side 1 of the sole to the rear end 2 of the heel and divided into three parts in the longitudinal direction of the sole, that is, in the vertical direction;
4, the sole member 3 on the inner side A of the sole is a hard elastic member with a hardness of 60 to 70 degrees, and the sole member 4 on the outer side A is the sole member 3 on the inner side A.
The bottom member 5 on the central side surrounded by the bottom members 3 and 4 on the inner and outer sides has a hardness of about 40 degrees to
The sole member 5 on the center side C is a 50-degree elastic member, and the bottom member 5 on the central side extends from the rear edge 2 of the heel somewhat outwardly to the unstepped part along the trajectory A that shows the movement of the weight of the shoe wearer when landing. A sports shoe sole equipped with a mid-sole characterized by being formed with a constant width extending to a side 1 and somewhat outward from a center line 8 of the heel of the sole. 2. The athletic shoe sole according to claim 1, wherein the midsole A is formed into a wedge shape that gradually becomes thinner from the heel portion to the non-stepped portion. 3. The sports shoe sole according to claim 1, wherein the sole member 5 of the central side C has a fan-like expansion 6 at the rear end 2 of the heel. 4. A request for registration of a utility model characterized in that the sole member 5 on the center side is formed such that the center point 7 of its width 6 is slightly closer to the outer side of the sole than the center line 8 of the sole. The soles of athletic shoes according to item 1.