JPH08107803A - Shoes - Google Patents

Abstract

PURPOSE: To prevent deterioration of the cushioning performance of a shoe, by disposing a cushion body in the sole of the shoe. CONSTITUTION: A cushion body 5 obtained by sealing a large number of small elastic bodies and gas into a bag body 6 having a nonreturn valve is provided in the heel and/or forepart of a shoe sole. Thus, because the bag body of the cushion body 5 has the nonreturn valve, the leak of the gas inside the bag to the outside can become difficult. Even if it leaks, the small elastic bodies prevent the cushion body 5 from shrinking, thus ensuring sufficient cushioning performance. The hardness characteristic of the cushion body 5 can easily be adjusted by the amount of air that is sealed in.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to shoes having an air cushion.

[0002]

2. Description of the Related Art Conventionally, shoes having improved cushioning properties by arranging a member in which air or the like is enclosed in the heel of a shoe sole are disclosed, for example, in Japanese Utility Model Publication No. 60-125907 and Japanese Utility Model Publication 60-1.
No. 72504, No. Sho 63-175405,
It is widely known as proposed in Japanese Utility Model Publication No. 1-179505.

[0003]

The conventional shoe is one in which a gas such as air is enclosed to obtain cushioning property, but the gas enclosure attached to the sole of the shoe leaks the enclosed gas due to the stimulus caused by exercise. It is very likely that you will do so. The gas-filled portion has a good cushioning property when the airtight state is sufficiently maintained, but once the airtight state is broken, the cushioning property cannot be obtained sufficiently. In this case, unevenness that does not match the sole of the foot is generated on the sole, which makes the shoe uncomfortable.

Conventionally, in order to restore the cushioning property, a device in which an air injection valve is provided in the gas filled portion has been proposed, but this is effective for recovering the cushioning property but prevents the cushioning property from deteriorating. Has no effect.

There is also a check valve as an air injection valve in order to keep the sealed state for a long time. However, even if the check valve is used, it is not possible to completely prevent the leakage of air, and the cushion is not used over time. Sexual deterioration occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a shoe which does not have a problem of deterioration of cushioning property and can be always worn comfortably.

[0007]

A shoe according to claim 1, wherein a cushion body is arranged on a heel portion and / or a tread portion of a shoe sole, the cushion body being provided in a bag body having a check valve. It is characterized in that a large number of small elastic bodies and gas are enclosed.

According to a second aspect of the present invention, in the first aspect, the small elastic body is a sphere having a diameter of 0.5 to 15 mm.

A shoe according to claim 3 is the shoe according to claim 1 or 2, wherein the packing density of the small elastic body in the bag is 50 to 95.
It is characterized by being volume%.

A shoe according to a fourth aspect is the shoe according to any one of the first to third aspects, wherein the small elastic body is at least two.
It is characterized in that small elastic bodies of different sizes are mixed and used.

[0011]

In the present invention, since the bag body of the cushion body has the check valve, it is difficult for the gas inside to leak, and even if the gas leaks, a large number of small elastic bodies inside the bag body Since the cushion body does not sag, the cushioning property can be sufficiently secured. The cushion body is
By adjusting the amount of air enclosed, the hardness characteristics can be easily adjusted.

According to the shoes of claims 2 and 3, it is possible to obtain a better cushioning property.

According to the shoe of claim 4, it is possible to increase the packing density of the small elastic body and obtain a good cushioning property.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the shoe of the present invention, and FIG. 2 (a) is a partial sectional front view showing a cushion body used in the shoe of FIG. 1, FIG. b) is a side view of the same.

The shoe 1 of the present invention is mainly composed of an upper member 2 constituting the upper of the shoe, a midsole member 3 and an outsole member 4 constituting the bottom,
The heel portion of the midsole member 3 forming the bottom portion is provided with a recess 3A for loading the cushion body 4.
3B is a through hole provided so as to communicate with the recess 3A from the side of the midsole member 3, and in the shoe of this embodiment, the check valve portion 5 of the cushion body 5 is provided in this through hole 3B.
A is inserted, and the plug 7B of the check valve 7 is configured to be exposed on the side of the heel of the shoe 1.

The cushion body 5 includes a bag body 6 having a substantially disc-shaped main body portion 6A and a short tubular check valve attachment portion 6B, and a check valve attached to the check valve attachment portion 6B of the bag body 6. It is composed of a valve 7 and a small elastic body 8 (8A, 8B) filled in the body portion 6A of the bag body 6.

In this embodiment, as the small elastic body 8,
Two kinds of elastic spheres having different particle diameters, that is, an elastic sphere 8A having a relatively large particle diameter and an elastic sphere 8B having a relatively small particle diameter, are mixed and filled. The gap between the small elastic bodies 8 is filled with gas (air).

Reference numeral 7A is a duckbill of the check valve 7, and the opening of the plug 7B of the check valve 7 is provided so as to be opened only when gas is injected and sealed except when the gas is injected.

In the present invention, the constituent material of the small elastic body is not particularly limited as long as it has elasticity, but for example, a foaming resin such as styrene foam or polyvinylidene chloride as a main component is used. A special copolymer impregnated with a foaming agent (specifically, the trade name "Cellmore (trademark)"
“Filler” (manufactured by Asahi Kasei Co., Ltd.) and the like can be used. In addition, natural rubber (NR), polybutadiene rubber (BR), styrene-butadiene copolymer rubber (SB
R), polyisoprene rubber (IR), nitrile rubber (N
BR), a rubber such as ethylene-propylene copolymer rubber (EPR), a thermoplastic rubber such as 1,2-polybutadiene, a styrene-butadiene block copolymer, or a mixture thereof. Elastic materials made of synthetic resin such as soft vinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), polyethylene (PE), polystyrene (PS) having elasticity and flexibility can also be used. As the constituent material of these small elastic bodies, the compression force when one elastic sphere having a particle diameter of 3 mm is compressed at a compression strain rate of 50% is 0.05 to 1.00 kg.
Those having elasticity of about / piece are preferable.

The shape of this small elastic body is not particularly limited, either.
Although it is not limited to a sphere, it is preferably a sphere or a substantially sphere in terms of filling density, filling workability and the like.

The size of the small elastic body may be any size as long as it can be filled in the bag body, and in the usual case, the particle size (diameter) is 0.5.
It is preferably about 15 mm. For this small elastic body,
As shown in the figure, by using two or more kinds having different particle sizes, the packing density in the bag body can be increased and the cushioning property of the cushion body can be improved. In this case, as the small elastic body, for example, an elastic sphere having a relatively small particle diameter of about 0.5 to 3 mm and an elastic sphere having a relatively large particle diameter of about 5 to 15 mm are mixed and used. It is preferable that the mixing ratio is such that elastic spheres having a relatively small particle diameter: elastic spheres having a relatively large particle diameter = 1: 1 to 10 (volume ratio).

The packing density of the small elastic body in the bag is
It is desirable that the packing density is relatively high so that the cushioning property of the cushion does not deteriorate even if the gas in the bag escapes, preferably 60 to 95% by volume, more preferably 85 to 95% by volume.

The constituent material of the bag is not particularly limited,
Any material can be used as long as it can withstand the impact resistance of the cushion body. In the usual case, a material having a JIS A hardness of about 40 to 95 °, for example, a resin such as ethylene-vinyl acetate copolymer resin, urethane, polyethylene, or rubber can be used.

The shape of the bag body is not particularly limited, and can be appropriately changed depending on the place where the bag body is provided and the size and size of the shoe.

In the illustrated embodiment, the shoe sole is composed of two members, the midsole member 3 and the outsole member 4, but the sole is composed of one sole member. Is also good.

Further, the check valve of the cushion body can be provided so as to be exposed on the rear part of the shoe in addition to the side part, but it is exposed on the side part from the viewpoint of easy injection of air. It is better to install it.

Further, the cushion body may be provided not on the heel of the shoe but on the stepping part, or may be provided on both the heel and the stepping part.

With such a cushion body 5, the hardness of the cushion body 5 can be appropriately adjusted by injecting air from the check valve 7, whereby the heel portion (and / or the heel portion) of the shoe 1 can be adjusted. The stepping part) can have a desired hardness.

By providing the check valve 7,
The air once injected into the cushion body 5 is very unlikely to leak out, but even if the air leaks out over time, the small elastic body 8 is filled in the cushion body 4, so this small elastic body By 8, the cushioning property of the cushion body 5 can be sufficiently ensured.

The cushion body 5 is not limited to being non-removably provided, but may be removably provided from the inside of the shoe.

The shoe of the present invention as described above is particularly effective for tennis shoes and the like, especially for athletic shoes which require shock absorbing performance.

The present invention will be described in more detail with reference to specific examples.

Example 1 The ethylene-vinyl acetate copolymer resin (JIS A hardness 8) in which the dimensions A, B and C in FIG. 2 are as follows:
5 °) The bag body is filled with the following two types of small elastic bodies at the following packing density, and a check valve formed by mounting a silicone rubber duck bill on a resin plug (diameter D = 10 mm) is attached to the cushion body. Was produced.

Bag size A: 40 mm B: 60 mm C: 12 mm Small elastic body Elastic sphere with a relatively small particle size: Selmore (trademark) sphere with a particle size of 2 mm Elastic sphere with a relatively large particle size: 10 mm with a particle size Cellmore (trademark) sphere packing density 28% by volume of elastic spheres having a relatively small particle size, 42% by volume of elastic spheres having a relatively large particle size, and a total of 70% by volume. A tennis shoe was produced by placing the midsole member on the heel portion.

In use, the hardness of the cushion body was adjusted by injecting air from the check valve with an injector according to the preference of the user.

As a result, it was confirmed that the cushioning property was not deteriorated even after being used for playing for a total of 60 hours over 90 days, and the feeling of use was extremely good.

[0038]

As described in detail above, according to the present invention, the cushioning property does not decrease for a long period of time, and
Provided is a shoe in which the hardness of the shoe sole can be easily adjusted and good comfort can be maintained.

According to the shoes of claims 2 and 3, further excellent cushioning properties can be obtained.

According to the shoe of claim 4, it is possible to increase the packing density of the small elastic body and obtain a good cushioning property.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a shoe of the present invention.

FIG. 2 shows an embodiment of a cushion body according to the present invention,
2A is a partially sectional front view, and FIG. 2B is a side view.

[Explanation of symbols]

 1 shoe 2 upper member 3 midsole member 4 outsole member 5 cushion body 6 bag body 7 check valve 8 small elastic body

Claims (4)

[Claims] 1. A shoe in which a cushion body is arranged on a heel portion and / or a stepped portion of a shoe sole, the cushion body having a bag body having a check valve filled with a large number of small elastic bodies and gas. Shoes that are characterized by. 2. The shoe according to claim 1, wherein the small elastic body is a sphere having a diameter of 0.5 to 15 mm. 3. The shoe according to claim 1 or 2, wherein the packing density of the small elastic body in the bag is 50 to 95% by volume. 4. The shoe according to claim 1, wherein at least two kinds of small elastic bodies having different sizes are mixed and used as the small elastic body.