JPH04117903A - Stress cushion structure of shoes - Google Patents

Abstract

PURPOSE:To obtain the novel stress cushion structure which fits to the protective sections of shoes to be subjected to impact, etc., and protects these sections against impact, etc., without flowing by gravity by incorporating hollow microspherical bodies having elasticity into bouncing putty, thereby forming the cushion part to be provided in the protective sections. CONSTITUTION:The bouncing putty consists of, for example, 50 to 80% boron-contg. siloxane, 10 to 30% pigment + silicon dioxide, 0 to 15% diorgano-polysiloxane, and 1% higher fatty acid, etc. Although this putty is weak in self-shape retaining property, the putty having the self-shape retaining property is obtd. by adding 1 to 10 parts hollow spherical bodies mentioned above, for example, the spherical bodies formed by including isobutane into a copolymer of vinylidene chloride and acrylonitrile, capsulating such copolymer and expanding the capsules, to 100 parts putty. This stress cushion blank material 12 is applied to the ankle part 3, the ankle-bone part 4, the heel part 5, and the instep part 6. The ankle cushion part 9 is made into the structure to draw a tube 11 by providing, for example, a hinged screw structure 13 to one end of the tube 11 sealed with this blank material 12. While this blank material changes softly to a slow stress change, the material exhibits high resistance to a fast stress change.

Description

[Detailed Description of the Invention] (Objective of the Invention) <Industrial Application Field> The present invention relates to shoes, and particularly relates to improvements in cushioning materials for protected areas such as heels and ankles that are subject to stress from impacts. be.

<Background of the Invention> For example, athletic shoes receive strong impacts on the heels and ankles during exercise, so cushioning materials are provided inside the shoes to protect the feet. Conventionally, rubber, elastic plastics, sponge, etc. have been used as such cushioning materials, but although these materials all have elasticity, their shape is fixed, so the fit may vary depending on the unevenness of the protected area. However, due to the difference in shape between the protected area and the buffer part, there were cases where the protected area was worn out or the area felt uncomfortable.

On the other hand, although it deforms extremely flexibly under slow stress changes,
Bouncing putty is known as a material that exhibits strong resistance to rapid stress changes. This material is expected to be excellent as a cushioning material due to its physical properties, but since its self-shape retention is weak, for example, when using this material as it is as a cushioning material for shoes, it is difficult to protect the area. However, when you put the shoes on again, the putty will flow due to gravity, and it may take time to fit the cushioning material to your feet again, and in some cases, you may have to touch the flowed putty with your hands. It is expected that the shoes will have to be put on after the shoes have been restored to a nearly uniform state. Bouncing putty also has the drawbacks of being too heavy and expensive for use as a cushioning material. Due to these inconveniences, although bouncing putty has excellent properties, it has not been put to practical use as a cushioning material, and in reality it is used as a child's toy or for research purposes for rheological measurements. It was only used as a teaching material.

<Technical matters attempted to be developed> The present invention was made in view of the above background, and
If certain contaminants are added to bouncing putty, which cannot be used as a cushioning material because of its weak self-retention properties,
Focusing on the fact that it has self-shape retention without losing the characteristic advantage of bouncing putty, which is that it deforms flexibly in response to slow stress changes and has high elasticity or nearly rigidity in response to rapid stress changes, Using this material, we developed a practical stress-absorbing material, and using this new material, we attempted to develop a stress-absorbing structure for shoes.

(Structure of the Invention) <Means for Achieving the Object> That is, the stress buffering structure for shoes, which is the first invention related to the present application, is a shoe in which a buffer portion is provided in a protected area that receives stress such as an impact, and the buffer portion is It is characterized by being made of a stress buffering material in which elastic micro hollow spheres are mixed into bouncing putty.

Further, the second invention of the present application, which is a stress buffering structure for shoes, is characterized in that, in addition to the above-mentioned requirements, the buffer portion is provided in the ankle region of the shoe.

Furthermore, the third invention of the present application, which is a stress buffering structure for shoes, is characterized in that, in addition to the above-mentioned requirements, the buffer section is provided in the upper part of the shoe.

Furthermore, the stress buffering structure for shoes, which is the fourth invention according to the present application, is characterized in that, in addition to the above requirements, the buffer section is provided in the heel of the shoe.

Furthermore, the stress buffering structure for shoes, which is the fifth invention according to the present application, is characterized in that, in addition to the above requirements, the buffer portion is provided at the ankle of the shoe.

These inventions attempt to achieve the above object.

<Operation of the invention> The stress buffering material used for the stress buffering structure in the shoes of the present invention changes extremely flexibly in response to slow stress changes;
It exhibits strong resistance to rapid stress changes and exhibits properties close to high elasticity or rigidity.

In addition, this product has self-shape-retaining properties by mixing elastic minute hollow spheres into the bouncing putty, which does not have self-shape-retaining properties.

Therefore, by applying such a stress-buffering material to the cushioning part of the shoe, the cushioning part is encapsulated so that when the shoe is worn normally, the external force applied to the protected part is averaged out according to the unevenness of the protected part. It flows through the body and fits into the protected area. If there is no particular change in the stress distribution or if the external force applied is removed, the material retains its previously formed shape without causing any flow due to gravity. On the other hand, when a quick stress such as an impact is applied, the stress buffering material exhibits properties close to high elasticity or rigidity, and not only holds the protected area appropriately, but also disperses the impact onto a large pressure-receiving surface. protect.

<Examples> The present invention will be specifically described below based on illustrated examples. Reference numeral 1 denotes a basketball shoe to which the stress buffering structure of the shoe of the present invention is applied, and this shoe comprises a main body portion 2 into which the foot is inserted, a sole portion 2a, and a front covering portion 2b. The stress buffering structure of the present invention is applied to the ankle portion 3, the ankle portion 4, and the ankle portion 4 of the main body portion 2. It is applied to the heel portion 5 and the upper portion 6 of the cover portion 2b, respectively, and has a structure that protects the foot from external impact. First, of the main body part 2,
The stress buffering structure in the ankle portion 3 will be explained. As shown in FIGS. 1 to 3, the ankle part 3 has a leather skin part 7 on the outermost side, a sponge layer 8 on the inside thereof, and an ankle cushioning part to which the present invention is applied on the inside thereof. 9, and has a structure including an inner skin part 10 made of cloth at the innermost side. The ankle cushioning section 9 includes bouncing putty (bouncing pu, tty
) in which elastic microscopic hollow spheres are mixed. By providing a thumbscrew structure 13 at one end of the tube 12, the tube 11 can be constricted.

This wing screw structure 13 has a screw receiver in which a female thread is formed in the part 1.
4 and this screw receiver is formed with a male thread that screws into the part 14,
It consists of a thumbscrew part 15 at the tip to which the end of the tube 11 is connected, and by rotating the thumbscrew part 15, the duplex 11 can be squeezed while being twisted.

Incidentally, by providing the constricted structure of the tube 11 in this way, it is possible to change the state in which the stress buffering material 12 gathers within the tube 11, thereby changing the state in which the ankle portion 3 is fixed. In addition, as a structure in which the tube 11 is squeezed while being twisted as in this embodiment, there is a structure in which a worm gear 16 is provided so that the tube 11 can be twisted as shown in FIG. 4(a), and a structure as shown in FIG. The twisting operation may be performed using a separately prepared device. That is, the device to which the worm gear 16 is applied has a worm 16a and a worm wheel 16■], and by turning a handle 16c provided on the shaft of the worm 16a, the tube 11 connected to the shafts of the worm wheels 1 and 6b is rotated. It is designed so that it can be squeezed while being twisted.

In addition, when a device is used to perform the twisting operation, a fitting portion 18 is provided at the end of the duplex 11, and the fitting portion 18 is rotated by an electric tool 20 having a portion 19tt. This is to give twist to the tube 11. In this case, a locking tool 21 fixed to the tube 11 is locked to a stopper ring 22 formed on the outer skin 7 to prevent the tube IJ from being twisted back. Furthermore, as a method of squeezing the stress buffering material 12 within the tube 11, in addition to twisting the tube 11, there is also a method of squeezing the tube 11 by passing it through a narrow gap or pipe as shown in FIG. can.

That is, in the one shown in FIG. 5(a), the tube 11 is provided so as to be sandwiched between two rollers 23 provided with a certain gap, and a locking fitting 24 is provided at the end of the tube 11. is configured so that it can be locked to a plurality of fasteners 25 provided at regular intervals on the outer skin part 7 of the ankle part 3. The one shown in FIG. 5(b) is the same in that the duplex 11 is sandwiched between two rollers 23, but the end of the tube II is locked to the take-up roller 26 and the handle 26a is The duplex 11 is wound up by operation. This device has a structure in which the handle 26a is fixed so that it does not unwind. Furthermore, the one shown in FIG. 5(c) consists of a fixing fitting 27 formed with a female thread, and a tubular drawing fitting 28 formed with a male thread that engages with the female thread. The diaphragm fitting 28 is configured to be moved by rotating a rotary plate 28a formed in the diaphragm with a knob 28b. Incidentally, in the structure shown in FIG. 5 (a Hb), the tube 11 is squeezed with the tube 11 sandwiched between the rollers 23, and in the structure shown in FIG. As the tube 11 moves, the tube 11 is squeezed into the tubular drawing fitting 28, thereby changing the gathering condition of the stress-buffering material I2 in the tube 11 and changing the fixing condition of the ankle portion 3. . Furthermore, in each of the above embodiments, one tube 11 is narrowed from one direction, but as shown in FIG. 6, two tubes 11 are provided from the rear side to the side of the basketball shoe 1, and as shown in Each tube 11 may be narrowed on the rear side of the basketball shoe 1 by operating the handle i 6 c using a structure similar to that in which the worm gear 16 shown in (a) is applied. Incidentally, if such a structure is adopted, the stress buffering material 12 can be gathered evenly on the sides of the ankle, so that a stable fixation state of the ankle part 3 can be obtained.

Here, the bouncing putty and elastic micro hollow spheres that constitute the stress buffering material 12 will be explained. The bouncing putty used in the present invention is disclosed in U.S. Pat. No. 2,541,851, etc., and deforms extremely flexibly in response to slow stress changes, but exhibits strong resistance to fast stress changes, and has high elasticity or near-rigidity. A deformable putty-like substance with This property of this product is thought to be due to the fact that hydrophilic and hydrophobic groups are in an equilibrium state. The structure of this product is a two-layered structure consisting of a network of silicone, most of which has hydrophobic methyl groups and is cross-linked, and a structure consisting of a sticky liquid reactive product of a boron mixture and methyl silicone, etc. has. The hydrophilic reaction product forms a phase in the interstices of the crosslinked silicone. It is also believed that the unique properties of this material are due to the large friction between the hydrophilic and hydrophobic side groups. In other words, when this substance is dropped onto a hard surface, for example, the frictional force between the hydrophilic and hydrophobic groups acts so that each molecule does not slip, making it look like an elastic solid. Furthermore, when subjected to a sharp impact such as being hit with a hammer, it exhibits properties close to a kind of rigidity. On the other hand, when pressure is gradually applied, the boron component can overcome the frictional force and flow out between the meshes of the network, resulting in extremely flexible deformation. An example of the ingredients of the bouncing putty is as follows.

Boron-containing siloxane 50-80% pigment silicon dodecoxide 10-30% diorganopolysiloxane O-15% higher fatty acid, etc.
A 1% bouncing putty is obtained by treating an organopolysiloxane with a mixture of boron and continuously by applying heat and/or a catalyst as appropriate. Here, the boron mixture includes pyroboric acid, boric anhydride, boric acid, ethyl borate, and other boric acid esters, but a specific boron mixture can be selected depending on the characteristics desired for a product.

An example of a method for manufacturing bouncing putty is shown below.

The organopolysiloxane used in the manufacturing method is oil-based methylsiloxane, which is obtained by hydrolysis of an almost pure dimethyl silicone halogen compound, and its structure is such that the end portion is (CH: (): (S I O[1,5 and the middle part is (
It is represented by CF-I + ()2 SIO. First, 75 parts of dimethyl silicone oil (expressed in parts by weight; the same applies hereinafter) and 10 parts of pyroboric acid are mixed, and this mixture is heated in an oven at 150'C for 2 hours.

Towards the end of heating, the mixture becomes a somewhat elastic gel. To 45 parts of this gel, 90 parts of Litopone (white pigment) and 0.9 parts of benzoyl peroxide are mixed until a solid mass is formed, and this is further mixed with 45 parts of dimethyl silicone oil and 0.9 parts of dimethyl silicone oil. Add benzoyl peroxide to make it more solid. 100 solid
Heat in the oven for 2 hours at between 150 and 150 degrees.

By kneading the resulting product with fingers, it becomes putty-like and has high adhesiveness and repulsion. It is noted that the use of a hydrolyzable alkylborate salt or an equivalent amount of catalyst is convenient for dispersing boron mixtures in methyl silicone oil. Furthermore, by changing the amount of the boron mixture, the amount of catalyst, and even the heating time, the ratio of wood-philicity to hydrophobicity changes by 1/1, so the elasticity and elasticity of the resulting stress-buffering material change. Gain flexibility and control. The elasticity and flexibility can also be adjusted by adding hydrophilic or hydrophobic substances such as glycerin or oleic acid.

Next, elastic micro hollow spheres are, for example, Expancel (registered trademark) developed by Expancel of Sweden,
It is a powder represented by Matsumoto Microspheres (registered trademark) manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd. Expancel is an organic microscopic hollow sphere made from a copolymer of vinylidene chloride and acrylonitrile manufactured in 1980, with a shell containing and encapsulating isobutane as an expanding material. Expancel has unexpanded (
There are two types: unfoamed) and expanded (foamed) types, but the expanded ones have an average particle size of 40 μ5 and a particle size range of 10 to 10.
The average particle size of the unexpanded particles is 10μ, and the particle size range is 5 to 30μ, which is larger than the average particle size of the unexpanded particles, and the expanded particles have excellent cushioning properties. EXPAN CE l-1DE
551 is used. Expancel has a shell wall of about 0.1 part that is elastic, so it compresses when a load is applied or returns to its original state when the load is stopped, so this material is mixed into the bouncing putty. This increases impact resistance and cushioning properties. In addition, since Expancel is spherical, it can provide a much better stress distribution than other fillers. There are two types of Matsumoto microspheres: those that have a shell wall made of vinylidene chloride copolymer and encapsulate low-boiling hydrocarbons, and those that have a shell wall that does not contain vinylidene chloride that encapsulates low-boiling hydrocarbons. 80E
D is an expanded (foamed) particle with a particle size range of 20 to 80μ, and is the same as the above-mentioned EXPAN CE L-
It can be used almost equivalently to D E 551. Although it depends on how the bouncing putty is adjusted, these elastic microscopic hollow spheres are usually added in an amount of 1 to 10 parts per 100 parts (by weight) of the bouncing putty. Note that a kneader or the like is used to mix the elastic microscopic hollow spheres into the bouncing putty. Incidentally, as mentioned above, bouncing putty has poor self-shape retention when used alone and will flow if left alone, but by mixing elastic micro hollow spheres into it to create the stress-buffering material I2, bouncing putty is able to maintain its own shape. Because it has shape-retaining properties, it is essential to use it as a cushioning material. Bouncing putty itself has a relatively high specific gravity, but by mixing elastic micro hollow spheres with a low specific gravity, a stress buffering material 12 with a relatively low specific gravity can be obtained, so this can be used as a buffering material. For example, it is possible to obtain a lightweight cushioning material suitable for practical use. Incidentally, the stress buffering material 12 obtained by adding Expancel, Matsumoto microspheres, etc. to the bouncing putty is also superior in producing film-encapsulated products compared to the case of using only the bouncing putty. That is, the stress buffer cable material 1 is placed between the - sheets of film.
When manufacturing an enclosed product sandwiching 2, - For boat fishing, heat-weld the upper and lower films using a three-layer sheet of film + stress-buffering material film, using a mold with irregularities in the shape of an appropriate frame. In this case, when sandwiching the uneven mold from above and below, stress buffering material 1 is made by adding Expancel, Matsumoto microspheres, etc. to bouncing putty.
2 has better cutting ability than the bouncing putty m body, so heat welding can be done securely, and it is also possible to produce it from a single company.

Next, the structure of the buffer parts provided in the ankle part 4 and the heel part 5 of the main body part 2 will be explained. Here, the structure of the main body part 2 will be briefly explained. As shown in FIGS. 1 to 3, the main body part 2 has a leather skin part 7 on the outermost side, a sponge layer 8 on the inside thereof, and a sponge layer 8 on the inside thereof. It has a structure including an inner skin part 10 which partially has the stress buffering structure of the present invention on the inside. As shown in FIG. 7, the endothelial part 10 is
It is made by sewing two pieces of triangular fl Oa together, and a holding cloth 30 is attached to the back side of the fl
A ankle cushioning section 31 and a heel cushioning section 32 are provided between the ankle and the leather 10a and facing the ankle and heel, respectively. As shown in FIG. 7, these lower, S-slip and heel cushioning parts 31 and heel cushioning parts 32, respectively, have appropriate shapes according to the ankle and heel. Film 33 reinforced with shaped fabric
The stress-buffering material 12 is enclosed therein. In addition, in the case 7S having such a configuration, in order to prevent the movement of the stress buffering material 12 within the film 33, in the heel buffer part 31 and the heel buffer part 32, for example, as shown in FIGS. 8(a) and 8(b), It is also possible to form a partition 34 or a junction point 35 in the middle, as shown in FIG.

In addition, in this embodiment, the shoulder cushioning part 31 and the heel cushioning part 3 are
2 are provided separately and independently, but they are formed so that a part of them is connected, so that when a force is applied to the heel buffer part 32, the stress buffer material 12 in the heel buffer part 32 is partially attached to the ankle buffer part 31.
You may want to move it to the side to provide more ankle protection.

g Next, the instep buffer section 36 provided in the instep section 6 of the front covering section 2b will be explained. Like the main body part 2, the front cover part 2b also has the first,
As shown in Fig. 2, it has a structure including an outer skin part 7 sponge layer 8 and an inner skin part 10 having a stress buffering structure according to the present invention. 30, there is provided an instep buffer section 36 in which a stress buffering material 12 is enclosed within a film 33.

The basketball shoe 1 to which the stress buffering structure of the shoe according to the present invention is applied has the structure as described above, and when wearing this shoe, first, the tube 11 in the ankle cushioning part 9 is made into an unrestricted state. Just put them on and wear them just like you would wear regular athletic shoes. Next, by turning the thumb screw part 15 of the thumb screw structure I3 in the ankle buffer part 9 and squeezing the tube 11, the stress buffer material 12 in the tube 11 is gathered around the ankle and the ankle is fixed. In this way, the stress-absorbing material 12 will move appropriately within the tube 11 according to the shape of the ankle, and will adapt to the ankle. In addition, when the basketball shoes 1 are worn and the laces are tightened, the ankle cushioning section 3], the heel cushioning section 32, and the instep cushioning section 36 are
It deforms according to the shape of the ankle, heel, and instep to better fit the foot. Furthermore, if a shock is applied to the foot, ankle, heel, or instep in such a state, the stress buffering material 12 in each buffer section will exhibit strong resistance and will have properties close to high elasticity or rigidity. Therefore, the protected parts such as the feet are fixed and sprains, fractures, etc. are prevented. In addition, when the protected area is relatively protruding, such as the ankle, the stress buffering material 12 escapes from the protruding part and gathers around the ankle and S-s; However, as shown in FIG. 3, since the ankle is fixed from around the ankle, it provides a sufficient buffering effect against external shocks. still,
Although the present invention has been applied to basketball shoes in the embodiments described above, it can also be similarly applied to other shoes and shoes for special sports such as skis and skates.

(Effects of the Invention) The present invention provides an unprecedented type of stress buffering material that flexibly deforms in response to slow stress changes, exhibits strong resistance to fast stress changes, and exhibits properties close to high elasticity or rigidity. 12 has been applied to the cushioning part of the shoe, so when wearing shoes or during normal walking, each cushioning part deforms according to the shape of the protected area and fits the foot, preventing the shoe from wearing out or causing discomfort. I don't feel anything. In addition, unlike the case where the bouncing putty alone is applied as a shock absorbing material, the shape that is once fitted to the protected area will continue to be maintained as long as no external force is applied. It takes less time to fit,
The next time you put on your shoes, you won't have to worry about it, and if stress such as an impact is applied to each cushioning part, the protected area will be fixed, and the stress cushioning material 2 will soften the impact. No force is applied to the protected area and no vibrations are transmitted.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a basketball shoe equipped with a stress buffering structure according to the present invention, Fig. 2 is a longitudinal sectional side view of the same, and Fig. 3
The figure is a cross-sectional view of the same as above, FIG. 4 is a perspective view showing two other embodiments of the stress buffer structure, FIG. 5 is a perspective view showing various other embodiments, and FIG. 6 is an ankle buffer section. Fig. 7 is a partially enlarged exploded view of the inner skin, and Fig. 8 is a perspective view showing examples in which the tubes are arranged in different ways. It is an explanatory view showing an example of seeds. 1; Basketball shoes 2; Main body part 2a; Sole part 2b; Front covering part 3; Ankle part 4; Ankle part 5; Heel part 6; Instep part 7; Outer skin part 8; Sponge layer 9; Ankle cushioning part 10; Inner skin part 10a; Leather 11; Tube 12; Stress buffering material 13; Thumb screw structure 14; Screw receiver part 15; Thumb screw part 16; Worm gear 16a; Worm 16b; Worm wheel 16C; Handle 18; Fitting part 19; Fitting part Part 20; Electric appliance 21; Locking tool 22; Stop ring 23; Roller 24; Locking fitting 25; Stop 26; Winding roller 26a; Handle 27; Fixing fitting 28; Squeezing fitting 28a; Rotating plate 28b; 30; Holding cloth 31; Ankle buffer part 32; Heel buffer part 33; Film 34; Partition 35; Junction point 36; Instep buffer part

Claims (5)

[Claims] (1) Stress-buffering shoes in which a shock-absorbing part is provided in a protected area that receives stress such as impact, wherein the buffer part is made of a stress-buffering material made of bouncing putty mixed with elastic microscopic hollow spheres. structure. (2) The stress buffering structure for a shoe according to claim 1, wherein the buffer portion is provided at an ankle portion of the shoe. (3) The stress buffering structure in a shoe according to claim 1, wherein the buffer portion is provided in the upper portion of the shoe. (4) The stress buffering structure for a shoe according to claim 1, wherein the buffer portion is provided in a heel portion of the shoe. (5) The stress-absorbing structure in a shoe according to claim 1, wherein the buffer portion is provided at an ankle portion of the shoe.