JPH04269902A - Safety device for roamed mid-sole - Google Patents

Abstract

PURPOSE:To inhibit too much inward and outward twisting of feet to promote natural movement of feet in running and in walking. CONSTITUTION:A crooked groove 24 is provided in the lateral direction between a non-stepped part 21 and the rear of the stepped part 22 of a hard synthetic resin-made plate. A plurality of fitting grooves 25, 25 are provided in the longitudinal direction perpendicular to the crooked groove 24. An expandable rubber long pieces 3, 3,..., with repelling elasticity are expandably fit into this fitting groove 25, 25 in correspon dance to the crook of this crooked groove.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stabilizer for a foamed midsole.

0002

2. Description of the Related Art Conventionally, it is well known that a stabilizer plate made of a flat plate made of steel or hard synthetic resin is embedded in a foamed midsole from the non-stepped part to the stepped part.

[0003] When changing direction during normal walking, or due to fatigue of muscle ligaments during long walking, the heel of the foot pronates or the stepping part of the foot supinates as a natural movement of the foot. It is something to do. In this case, since the forefoot and hindfoot rotate in a twisting manner, the flat steel shank embedded in these parts restrains the twisting of the forefoot and hindfoot, allowing the foot to move naturally during walking. There was a drawback that movement was hindered. From this point of view, a shoe sole that does not use a shank may be considered, but the pronation of the heel of the foot or the supination of the stepping part of the foot during walking and running are not constrained, and the foam midsole partially Over-pronation or over-supination is caused by excessive compression, causing the muscles of the foot to
It has the disadvantage of causing damage to ligaments and joints.

0004

[Problems to be Solved by the Invention] This invention promotes the natural movement of the foot during walking by attaching it to the sole of the shoe, and also solves the problem of excessive pronation of the heel of the foot and of the stepping part of the foot. The present invention aims to provide a stabilizer for a foamed midsole that can prevent excessive supination.

[0005]

[Means for Solving the Problems] The present invention will be explained below with reference to the drawings. The present invention is based on a hard synthetic resin plate 2 embedded from a non-stepped part 11 to a stepped rear part 12 of a foamed midsole 1. A bending groove 24 is provided in the transverse direction between the non-stepping part 21 and the stepping rear part 22, and a plurality of fitting grooves 25, 25... are provided in the longitudinal direction intersecting the bending groove 24. 25.25... are elastic elastic rubber strips 3.3..., the tip portions 31.31... and rear ends 32.32... of the resin plate, the tip portions 201... and the rear ends 202... The gist of the invention is a foamed midsole stabilizer characterized in that the stabilizer is fixed to the foamed midsole so that it can expand and contract in accordance with the bending of the bending groove 24.

[0006] In this invention, the foamed midsole 1 includes:
It is made of a cushioning foam such as rubber foam, EVA, or polyurethane foam. The hard synthetic resin plate 2 is made of hard synthetic resin such as polyurethane resin, polyamide resin, ABS resin, polyester resin, and epoxy resin. This hard synthetic resin play
The bending groove 24 provided in the transverse direction between the non-stepping part 21 and the stepping rear part 22 of the foot 2 may be a single groove, or may be provided in a plurality of grooves at regular intervals. The fitting grooves 25, 25, which are provided in the longitudinal direction of the hard synthetic resin plate 2 and intersecting with the bent grooves 24, approximately correspond to the shape of the elastic rubber strips 3, 3, which are used in the present invention. , the elastic rubber strips 3.3... are formed to have a slightly larger cross-sectional shape so that they can be expanded and contracted when fitted. In this invention, the tip portion 20 of the hard synthetic resin plate
1 and the rear end portion 202, engagement grooves 26, 26 are provided in succession to the engagement grooves 25, 25..., and a plurality of elastic rubber strips 3, 3... are integrated at the front and rear thereof. If the connecting portions 33.33 are engaged and fixed in the engaging grooves 26.26, the elastic rubber strips 3.3 can be easily set to the hard synthetic resin plate 2.

[0007] The foamed midsole stabilizer of the present invention includes:
Unexpanded part 1 of midsole 1 during molding of foamed midsole 1
This can be done by embedding molding from 1 to the treading rear part 12. In this invention, when the length of the hard synthetic resin plate 2 in the lateral direction is smaller than the length of the foamed midsole in the lateral direction at the embedded position, the foamed midsole is formed continuously in the bending groove 24. bend groove 1
4.14... is preferably provided.

[0008]

Effects of the Invention Since the present invention is constructed as described above, when walking or running while wearing shoes using a foamed midsole in which the foamed midsole stabilizer of this invention is embedded, When the heel of the foot pronates, the rear foot (heel) of the foam midsole moves inward along the bending groove 24 formed in the hard synthetic resin plate 2 as the foot moves. The repulsive rubber strip 3'', which is telescopically fitted into the fitting groove 25, is disposed on the outer side of the groove 24. The repulsive rubber strip 3'' is stretched and bent largely toward the inner rear than the repulsive rubber strip 3', allowing the foamed midsole to twist inwardly, and at the same time, the resilient rubber strip 3'' is greatly stretched. A larger shrinkage load than the repulsive rubber strip 3' is applied to the foam midsole 1, and the hard synthetic resin plate 2 embedded from the non-stepped part 11 to the stepped rear part 12 of the foamed midsole 1 1 prevents excessive compression in the medial side 15 of the foam midsole, thereby preventing excessive inward twisting of the heel portion of the foam midsole, ie, excessive pronation. In addition, when the stepping part of the foot supinates, the repulsive rubber strip 3' arranged on the outer side of the groove 24 is directed outward and forward more than the repulsive rubber strip 3'' arranged on the inner side of the groove 24. The foamed midsole is stretched and bent, allowing the forefoot portion of the foam midsole to twist outward, and at the same time, a larger contraction load is applied to the highly stretched rebound rubber strip 3' than to the rebound rubber strip 3''. foam midsole
A hard synthetic resin plate 2 buried from the unstepped part 11 of the sole 1 to the stepped rear part 12 makes the foam midsole 1
Excessive compression at the lateral sides 16 of the foam midsole is restrained, thereby preventing excessive lateral kinking or supination of the forefoot portion of the foam midsole. Therefore, natural movement of the foot is promoted during walking, and excessive pronation of the heel of the foot and excessive supination of the stepping portion of the foot are prevented.

[Brief explanation of the drawing]

FIG. 1 is a sketch showing the state of implementation of the present invention.

FIG. 2 is a cross-sectional view taken along line XX in FIG. 1;

FIG. 3 is a sectional view taken along the Y-Y line in FIG. 1;

FIG. 4 is a sketch of a foamed midsole in which the stabilizer of the present invention is embedded.

[Explanation of symbols]

Claims (1)

[Claims] Claim 1: A hard synthetic resin plate 2 buried from the unstepped part 11 of the foam midsole 1 to the stepped back part 12 is bent in the transverse direction between the unstepped part 21 and the stepped back part 22. A groove 24 is provided, a plurality of fitting grooves 25, 25... are provided in the longitudinal direction intersecting the bending groove 24, and resilient elastic rubber strips 3.3... are provided in the fitting grooves 25, 25... Its tip 31.
31... and the rear end portions 32, 32... are fixed to the front end portion 201 and the rear end portion 202 of the resin plate, so that they are fitted so as to be expandable and contractible in accordance with the bending of the bending groove 24. Features a foam midsole stabilizer.