JP2617812B2 - Stress buffer structure in shoes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Purpose of the Invention><Industrial application field> The present invention relates to shoes, and more particularly to an improvement in a cushioning material for a protective portion such as a heel or an ankle which receives a stress such as a cushioning. is there.

<Background of the Invention> For example, athletic shoes receive a strong impact on heels, ankles, and the like during exercise, and thus a cushioning material is provided inside the shoes to protect the feet. Conventionally, rubber, elastic plastics, sponges, and the like have been used as such cushioning materials.Each of these materials has elasticity, but since its shape is fixed, a fit feeling may be obtained depending on the degree of unevenness of the protection portion. In some cases, the protection part was worn out due to a difference in shape between the protection part and the buffer part, or the part felt uncomfortable.

On the other hand, a bouncing putty is known as a material which deforms very flexibly with a slow stress change but shows a strong resistance to a fast stress change. Although this material is expected to be excellent as a cushioning material due to its physical properties, it has poor self-retaining property. Although it fits unevenly, when putting on shoes again, the putty flows according to gravity during that time, so it takes time to fit the cushioning material again to the foot, and in some cases, the putty that has flowed by hand It is anticipated that the shoe will have to be worn after it has been corrected to a substantially uniform state. In addition, the bouncing putty also has the drawback that the weight itself is high and the price is high when used as a cushioning material. Therefore, due to these inconveniences, bouncing putty has excellent characteristics but has not been practically used as a cushioning material in practice, and is actually used for research on toys for children and rheology measurement. It was used only as a teaching material.

<Technical Issues Attempted to be Developed> The present invention has been made in view of such a background, and since a self-retaining property is weak, a certain contaminant is added to a bouncing putty that cannot be used as a cushioning material as it is. Focus on self-shaping without losing the characteristic advantage of bouncing putty that it deforms flexibly for slow stress changes and has high elasticity or near rigidity for fast stress changes. Using this material, a practically available stress buffering material was developed, and an attempt was made to develop a stress buffering structure for shoes using this new material.

<< Structure of the Invention >><Means for Achieving the Object> That is, the stress buffering structure in the shoe of the first invention according to the present application is a shoe in which a buffer is provided at a protection site that receives a stress such as an impact. It is characterized by being made of a stress buffering material in which elastic micro hollow spheres are mixed in a bouncing putty.

Further, the stress buffering structure in the shoe of the second invention according to the present application is characterized in that, in addition to the above requirements, the buffering section is provided at the ankle of the shoe.

Further, the stress buffering structure in the shoe according to the third invention according to the present application is characterized in that, in addition to the above requirements, the buffering section is provided on the upper of the shoe.

Further, the stress buffering structure in the shoe according to the fourth invention according to the present application is characterized in that, in addition to the above requirements, the buffering section is provided on the heel of the shoe.

Further, the stress buffering structure in the shoe according to the fifth invention according to the present application is characterized in that, in addition to the above requirements, the buffering section is provided in the ankle section of the shoe.

The present invention aims to achieve the above object.

<Effect of the Invention> The stress buffering material used for the stress buffering structure in the shoe of the present invention changes extremely flexibly to a slow stress change,
It exhibits strong resistance to rapid stress changes and exhibits properties close to high elasticity or rigidity. In addition, this product is made to have self-retaining properties by mixing elastic micro hollow spheres into a bouncing putty having no self-retaining properties.

Therefore, by applying such a stress buffer material to the buffer part of the shoe, when wearing shoes normally, the buffer part is enclosed so that the external force applied to the protection part is averaged according to the unevenness of the protection part Flows through the body and fits the protection site. Then, when there is no particular change in the stress distribution or when there is no applied external force, the shape once formed is maintained without causing flow due to gravity. on the other hand,
When a high stress such as an impact is applied, the stress buffering material shows high elasticity or near rigidity, holds the protection part appropriately, and protects the protection part by dispersing the impact on the large pressure receiving surface. I do.

<Example> Hereinafter, the present invention will be specifically described based on an illustrated example. Reference numeral 1 denotes a basket shoe to which the stress buffer structure of the shoe according to the present invention is applied, which comprises a main body portion 2 for putting in a foot, a sole portion 2a, and a front cover portion 2b. The stress buffering structure of the present invention includes an ankle 3, ankle 4, and heel 5 in the main body 2 and an upper 6 in the front cover 2b.
The structure is designed to protect the foot from external impact. First, the stress buffering structure in the ankle 3 of the main body 2 will be described. Ankle 3
As shown in FIGS. 1 to 3, a leather outer skin portion 7 is provided on the outermost side.
And a sponge layer 8 on the inside, an ankle buffer 9 to which the present invention is applied on the inside, and a cloth inner skin 10 on the innermost side. The ankle buffer 9 includes a tube 11 in which a bouncing putty, which is a stress buffering material 12, mixed with elastic micro hollow spheres is sealed. And by providing the thumb screw structure 13 at one end of the tube 11,
The tube 11 can be squeezed. The thumb screw structure 13 includes a screw receiving portion 14 having a female screw formed therein, a male screw screwing with the screw receiving portion 14, and a thumb screw portion 15 to which the end of the tube 11 is connected at the tip, By rotating the thumb screw part 15, the tube 11 can be squeezed while being twisted. By the way, by providing such a throttle structure of the tube 11, the tube
The fixed state of the ankle 3 can be changed by changing the gathering state of the stress buffering materials 12 in the inside 11. As shown in FIG. 4 (a), the tube 11 can be twisted by providing a worm gear 16 as shown in FIG. 4 (a), or as shown in FIG. 4 (b). The torsion operation may be performed by a separately prepared tool. That is, the one to which the worm gear 16 is applied has a worm 16a and a worm wheel 16b, and by turning the handle 16c provided on the shaft of the worm 16a, the tube 11 connected to the shaft of the worm wheel 16b is squeezed while being twisted. Is made possible. In the case of performing a twisting operation with an instrument, a fitting portion 18 is provided at the end of the tube 11, and a fitting receiving portion that fits with the fitting portion 18 is provided.
The tube 11 is twisted by rotating the fitting portion 18 by an electric device 20 provided with 19. In this case, the locking tool 21 fixed to the tube 11 is replaced with a retaining ring 22 formed on the outer skin 7.
To prevent the tube 11 from being untwisted. Further, the method of squeezing the stress buffer material 12 in the tube 11 may be a method of squeezing the tube 11 by passing it through a narrow gap or a pipe as shown in FIG. . That is, the one shown in FIG. 5 (a) is provided so that the tube 11 is sandwiched between two rollers 23 provided at a predetermined gap, and a locking member provided at an end of the tube 11. A plurality of stoppers 24 are provided on the outer skin 7 of the ankle 3 at predetermined intervals. The one shown in FIG.
It is the same in that the tube 11 is sandwiched between the two rollers 23, but the end of the tube 11 is locked by the take-up roller 26 and the tube 11 is operated by operating the handle 26a.
Is to be wound up. This structure has a structure in which the handle 26a is fixed so that it does not rewind. FIG. 5 (c) further comprises a fixing fitting 27 having a female screw formed therein and a tubular drawing metal fitting 28 having a male screw screwed with the female screw. By rotating the rotary plate 28a formed in the portion with the knob 28b, the aperture fitting 28 is moved. Incidentally, in the structure shown in FIGS. 5 (a) and 5 (b),
The tube 11 is squeezed in a state where the tube 11 is sandwiched between the rollers 23, and in the case shown in FIG. 5 (c), the tube 11 is Each tube 11
The fixed state of the ankle part 3 can be changed by changing the gathering state of the stress buffering materials 12 inside. In each of the above embodiments, one tube 11 is narrowed down from one direction. However, as shown in FIG. 6, two tubes 11 are provided from the rear side of the basket shoe 1 to the side.
By using the same structure as that to which the worm gear 16 shown in FIG. 1A is applied, the operation of the handle 16c may narrow down the tubes 11 on the rear side of the basket shoe 1. Incidentally, with such a structure, since the stress buffering material 12 can be gathered evenly to the side of the ankle, a more stable fixing state of the ankle 3 can be obtained.

Here, the bouncing putty and the elastic micro hollow sphere constituting the stress buffer material 12 will be described. The bouncing putty in the present invention is disclosed in U.S. Pat.No. 2,254,851 and the like, and deforms very flexibly for a slow stress change, but shows strong resistance to a fast stress change and has a property close to high elasticity or rigidity. Is a deformable putty-like substance having
It is believed that such properties of this are due to the equilibrium between the hydrophilic and hydrophobic groups. The structure of this product is a two-layer structure consisting of a silicone network having hydrophobic methyl groups and the like most of which is cross-linked, and a composition consisting of an adhesive liquid reactive product of a boron mixture and methyl silicone. Having. And the hydrophilic reaction product forms a phase in the interstices of the crosslinked silicone. It is also considered that the unique property of this is due to a large friction between both hydrophilic and hydrophobic groups. That is, when this is dropped on, for example, a hard surface, the frictional force between the hydrophilic group and the hydrophobic group works so much that each molecule does not slip, so that an elastic solid It exhibits such properties, and further exhibits a kind of rigidity under a sharp impact such as hitting with a hammer. On the other hand, when pressure is gradually applied, the boron component can flow out between the meshes of the network over the frictional force, so that the boron component deforms very flexibly. An example of the components of the bouncing putty is as follows.

Boron-containing siloxane 50-80% Pigment + silicon dioxide 10-30% Diorganopolysiloxane 0-15% Higher fatty acid, etc. 1% Also bouncing putty is obtained by treating organopolysiloxane with a mixture of boron, The catalyst is continuously obtained by appropriately providing one or both of the catalysts. Here, the mixture of boron is pyroboric acid,
Specific boron mixtures can be selected depending on the properties desired for the product, including boric anhydride, boric acid, ethyl borate, other borate esters, and the like.

The following is an example of a method for producing a bouncing putty. Incidentally, the organopolysiloxanes used in the process is a methylsiloxane oily, this compound is obtained by substantially the hydrolysis of pure dimethyl silicone halide compound or the like, its preparation the ends (CH _{3) 3} SiO _0.5 And the middle part is (CH ₃ ) ₂ SiO
Is represented by First, 75 parts of dimethyl silicone oil (representing parts by weight; the same as the following) pyroboric acid 10
And heat the mixture at 150 ° C. for 2 hours. At the end of the heating the mixture becomes a somewhat elastic gel. To 45 parts of this gel, 90 parts of lithopone (white pigment) and 0.9 parts of benzoyl peroxide are mixed until solidified, and further 45 parts of dimethyl silicone oil and 0.9 parts of benzoyl peroxide are added thereto. In addition, it is further made into a mass. The mass is heated in an oven at 100 to 150 degrees for 2 hours. By kneading the finished product with the fingers of the hand, it becomes putty and has high adhesiveness and resilience. The use of a hydrolyzable alkyl borate or the same amount of catalyst is convenient for dispersing a boron mixture in methyl silicone oil. By changing the amount of the boron mixture, the amount of the catalyst, and the heating time, the component ratio between the hydrophilicity and the hydrophobicity changes, so that the elasticity and flexibility of the resulting stress buffering material are controlled. Will be able to do it. The elasticity can also adjust the flexibility by adding a hydrophilic or hydrophobic substance such as glycerin or oleic acid. Next, the elastic micro hollow sphere is a powder represented by, for example, Expancel (registered trademark) developed by Expancel, Sweden, and Matsumoto Microsphere (registered trademark) manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd. . EXPANCEL is an organic micro hollow sphere made from a copolymer of vinylidene chloride and acrylonitrile, produced in 1980, and encapsulated and encapsulated with isobutane as an expanding material. There are unexpanded (unfoamed) and expanded (expanded) expanses.
μ, the particle size range is 10-100μ, the unexpanded one is larger than the average particle size 10μ, the particle size range 5-30μ,
In addition, since the expanded one has excellent cushioning property, the dried EXPANCEL-DE551 which has been expanded is used in this embodiment. Expancel has a shell wall of about 0.1μ and has elasticity, so it is compressed when it is overloaded, but has the property of returning to its original state when it is no longer overloaded. The impact resistance and the cushioning property are improved. Note that since the Expancel is a sphere, a stress distribution far superior to other fillers can be obtained. In addition, Matsumoto microspheres are classified into two types: those containing a vinylidene chloride copolymer as a shell wall and containing low-boiling hydrocarbons, and those containing low-boiling hydrocarbons in a shell wall containing no vinylidene chloride. -80ED has a particle size range of 20 to
Expaned (expanded) of 80μ, EXPA
It can be used almost equivalently to NCEL-DE551. Depending on the adjustment of the bouncing putty, 1 to 10 parts of these elastic micro hollow spheres are usually added and mixed with 100 (weight) parts of the bouncing putty. The elastic micro hollow spheres are mixed into the bouncing putty using a kneader or the like. By the way, the bouncing putty itself has a weak self-preserving property by itself, and flows when left alone.However, by mixing elastic hollow microspheres into the stress buffer material 12, the Since it has shape retention properties, it can be used as a cushioning material. The bouncing putty itself has a relatively large specific gravity, but by mixing an elastic hollow microsphere having a small specific gravity, a stress buffer material 12 having a relatively small specific gravity can be obtained. Then, a lightweight cushioning material suitable for practical use can be obtained. In addition, a stress buffer material made by adding Expancel or Matsumoto microspheres to bouncing putty
No. 12 also has an excellent point in producing a film-encapsulated product as compared with the case of using only a bouncing putty. That is,
When manufacturing an encapsulated product in which the stress buffering material 12 is sandwiched between two films, generally, a three-layer sheet of film + stress buffering material + film is appropriately molded using a frame-shaped uneven mold. The upper and lower films are heat-welded to produce a bumper.In this case, when the uneven mold is sandwiched from above and below, the bouncing putty is applied to the Since the cut is better than a single piece, heat welding is performed firmly and mass production becomes possible.

Next, a description will be given of the structure of the cushioning portions provided in the ankle portion 4 and the heel portion 5 in the main body portion 2. Here, the structure of the main body 2 will be briefly described. As shown in FIGS. 1 to 3, the main body 2 has a leather outer skin portion 7 on the outermost side and a sponge layer 8 on the inner side thereof. A structure having an endothelial portion 10 having a stress buffering structure according to the present invention in a part thereof is provided on the inside thereof. As shown in FIG. 7, the endothelial part 10 is formed by sewing two pieces of substantially triangular leather 10a together, and a holding cloth 30 is adhered to the back side of the leather 10a.
And an ankle buffer portion 31 and a heel buffer portion 32 are provided at portions facing the ankle and the heel, respectively. As shown in FIG. 7, each of the ankle buffer 31 and the heel buffer 32 has an appropriate shape corresponding to the ankle and the heel, and is reinforced with a mesh-like cloth as an example. The stress buffer material 12 is sealed in the film 33 thus formed. In addition, in such an ankle buffer part 31 and a heel buffer part 32, the film of the stress buffer material 12 is used.
In order to regulate the movement within 33, for example, FIG.
As shown in (b), a partition 34 can be formed in the middle, or a junction 35 can be formed. Further, in the present embodiment, the ankle buffer 31 and the heel buffer 32 are separately provided independently, but they are formed so as to connect a part thereof, and when a force is applied to the heel buffer 32, the heel buffer 31 is provided. Stress buffer material in 32 12
The protection of the ankle moving partly to the ankle buffer 31 may be strengthened.

Next, the upper cushion 36 provided on the upper 6 of the front cover 2b will be described. Like the main body 2, the front cover 2b has a structure having an outer skin 7, a sponge layer 8, and an endothelium 10 having a stress buffering structure according to the present invention, as shown in FIGS. Between the leather 10a constituting the 10 and the holding cloth 30 stuck on the back side thereof, a stress buffer material 12 is provided in the film 33.
An instep buffer section 36 enclosing is provided.

The basket shoe 1 to which the stress buffering structure of the shoe according to the present invention is applied has the above-described structure. When wearing the basket shoe 1, first, the tube 11 in the ankle buffer 9 is kept in a state where there is no restriction. , Just wear regular athletic shoes. Next, by turning the thumb screw part 15 of the thumb screw structure 13 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 buffer material 12 appropriately moves in the tube 11 according to the shape of the ankle,
Becomes familiar with the ankle. In addition, basket shoes 1
In a state where the strap is tightened by wearing the ankle, the ankle buffer 31, the heel buffer 31, and the instep buffer 36 are deformed according to the shapes of the ankle, the heel, and the instep, respectively, to fit the foot. In addition, if impact is applied to the ankle, ankle, heel, or instep in such a state, the stress buffer material in each buffer part
Since 12 has a high resistance and has a property close to high elasticity or rigidity, a protection part such as an ankle is fixed, so that a sprain or a fracture is prevented. In the case where the protection site is relatively protruding such as an ankle, the stress buffer material 12 escapes from the protruding portion and gathers around the ankle. As shown in FIG. 3, since the ankle is fixed from the periphery, it has a sufficient buffering action against an external impact. In the above embodiment, the present invention is applied to basket shoes. However, the present invention can be similarly applied to other shoes and special sports shoes such as skis and skates.

<< Effects of the Invention >> In the present invention, the buffer portion is flexibly deformed with respect to a slow stress change, exhibits a strong resistance to a fast stress change, and has a non-conventional type of stress buffering material exhibiting properties close to high elasticity or rigidity. Since 12 was applied to the buffer part of the shoe, when wearing shoes or in normal walking, each buffer part deforms according to the shape of the protective part and fits the foot, causing wear and tear or discomfort in the shoes I don't feel it. Also, unlike the case where the bouncing putty alone is used as a cushioning material as it is, the shape once fitted to the protection site is kept as long as no external force is applied, so that the effort to equalize the bias of the stress buffering material can be eliminated or the fit can be reduced Because it takes less time to
No extra time is required when wearing shoes for the next time.

On the other hand, when stress such as impact is applied to each buffer,
Since the protection part is fixed and the stress buffering material 12 softens the impact, no force is applied to the protection part and no vibration is transmitted.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a basket shoe provided with a stress buffering structure of the present invention, FIG. 2 is a vertical sectional side view of the same, and FIG.
FIG. 4 is a transverse sectional view of the same, FIG. 4 is a perspective view showing two other embodiments of the stress buffering structure, FIG. 5 is a perspective view showing still other various embodiments, and FIG. FIG. 7 is a perspective view showing an embodiment in which the arrangement of the tubes is changed, FIG. 7 is a developed view showing the inner skin part in a partially enlarged manner, and FIG. 8 is a view showing the restriction of the movement of the stress buffer material in the film. It is explanatory drawing which shows an Example of a kind. 1; basket shoes 2; main body 2a; sole 2b; front cover 3; ankle 4; ankle 5; heel 6; upper 7; outer skin 8; sponge layer 9; ankle buffer 10; endothelium 10a; Leather 11; Tube 12; Stress buffering material 13; Thumb screw structure 14; Screw receiver 15; Thumb screw 16; Worm gear 16a; Worm 16b; Worm wheel 16c; Handle 18; Mating part 19; Mating receiver 20; Power tool 21; Locking tool 22; Retaining ring 23; Roller 24; Locking tool 25; Stopper 26; Winding roller 26a; Handle 27; Fixing tool 28; Squeezing tool 28a; Rotating plate 28b; Knob 30; Retaining cloth 31; Ankle buffer 32; Heel buffer 33; Film 34; Partition 35; Junction 36; Instep buffer

Claims (5)

(57) [Claims] 1. A shoe comprising a protective portion provided with a buffer at a protection portion which receives a stress such as an impact, wherein said buffer is made of a stress buffering material in which an elastic hollow microsphere is mixed into a bouncing putty. Stress buffer structure. 2. The stress buffering structure according to claim 1, wherein the buffer is provided at an ankle of the shoe. 3. The stress buffer structure according to claim 1, wherein said buffer portion is provided on a shoe upper. 4. The structure according to claim 1, wherein said buffer is provided on a heel of the shoe. 5. The structure according to claim 1, wherein said buffer is provided on an ankle part of the shoe.