JPH07163401A - Foldable shoes - Google Patents

Abstract

PURPOSE:To provide foldable shoes, a part of the main body of which is formed of a shape memory resin, which can be used, at the time of wearing, with their memorized shoe shape recovered and which can be folded up small and can retain such folded shape, at the time of non-wearing. CONSTITUTION:The sole of the shoe main body is formed by rubber and, in the case of boot-type shoes, the upper and the leg part, and at least the shoe main body are formed of a shape memory resin, and the shoes can be folded up through deformation into a set shape or can restore the memorized set shape from the folded up shape, having being effected heating treatment under the temperature higher than the glass transition temperature and lower than the melting temperature of the shape memory resin. Such folding shoes are handy to keep or to carry, and, in addition, of highly practical value with excellent strength and providing comfortable feeling to wear, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable shoe using a shape memory resin.

[0002]

2. Description of the Related Art Conventionally, shoes made of resin or rubber for various purposes have been known. For example, shoes called underground tabi used in agricultural work and civil engineering work, short shoes that can reach the limbs of feet such as bath slippers used in bathrooms, or rain shoes worn in rainy weather, in the field Boots for various purposes, such as legs for work shoes used for agricultural work or fishing, and in some cases, special boots that can enter the body, and even shoes for sports such as skiing and skating. It has been known. Then, depending on the use of these shoes, it is decided which part of the human body to cover, and this inevitably determines the size thereof.

By the way, in recent years, the housing environment in urban areas has become more and more severe, and in apartments, condominiums, and other housing complexes, it is not in a state where any space for accommodating footwear can be secured, and in particular, legs are used. If the boots are large and bulky, such as boots that can fit in, it may not be possible to secure a dedicated storage space at the entrance or the like, and it may be necessary to wash each time after use and store them in the closet.

Further, such rain shoes and work shoes for special purposes are inconvenient to carry because they are so bulky that they cannot be carried even on a rainy day, and When the distance to the work place is long, there is a problem that it is difficult to carry work shoes.

[0005]

The present inventor has made diligent efforts in view of this point of view, and as a result, by forming the shoe main body with a shape memory resin, the shape of the shoe is memorized when necessary. The present invention has been completed by arriving at a foldable shoe that can be restored and can be folded to a small size when not needed, fixed and stored in the folded shape, or portable.

Therefore, an object of the present invention is that a part of the shoe main body is formed of a shape memory resin and can be restored to the memorized shape of the shoe at the time of use, and can be folded into a small size when not in use. An object of the present invention is to provide a foldable shoe that can be fixed in the folded shape.

Another object of the present invention is to use a part of bulky boots such as rain boots and work shoes made of a shape memory resin, and restore the stored boots shape to be used for the purpose. Another object of the present invention is to provide a foldable boot that can be stored and carried while being folded into a small size when not in use and fixed in the folded shape when not in use.

[0008]

That is, according to the present invention, the sole portion of the shoe body is formed of rubber, and at least the crepe portion of the shoe body or at least the crepe portion when the leg tube portion is present. The leg cylinder part is formed of a shape memory resin, and by being heated to a temperature higher than the glass transition temperature and lower than the melting temperature of the shape memory resin, it can be deformed into a predetermined shape and can be folded or folded. It is a foldable shoe capable of returning from a stored shape to a predetermined memorized shape.

According to the present invention, the shoe body has at least a crepe part or, if a leg cylinder part is present, at least a crease part and a leg cylinder part, so that the shoe can be folded as small as possible when not in use. It must be made of memory resin. Then, the shoe sole constituting this shoe main body may be formed of rubber suitable for the use of the shoe, and the other heels, toes, etc. may be formed of shape memory resin, but the application of the shoe Depending on the situation, it may be formed of other conventionally known materials.

As the shape memory resin used in the present invention,
It is not particularly limited, and conventionally known shape memory resins such as polyurethane resin, polystyrene / polybutadiene copolymer resin, polynorbornene resin, and polyisoprene resin can be used. A urethane resin or a polyisoprene resin having a glass transition temperature (Tg) of 40 to 70 ° C. is preferable because it can be freely set within a predetermined range and can be molded similarly to ordinary plastics. . Of course, what is selected as the shape memory resin is determined in consideration of the relationship between the application of the manufactured shoe (in particular, the environmental temperature at the time of use) and the shape restoration temperature. When the shoe itself is required to have a predetermined flexibility, other appropriate resin or rubber such as soft vinyl chloride or synthetic rubber may be blended.

For the sole portion of the shoe body, various conventionally known rubbers can be selected according to the application of the shoe. Here, the shape memory resin for forming the above-mentioned crepe and leg tube is used. Rubber that has the property of being bonded or fused together and is also effective in terms of strength and comfort, such as when the shape memory resin is a polyisoprene resin,
Examples include various conventionally known rubbers such as natural rubber, synthetic rubber, and mixtures thereof.

[0012] In addition, various conventionally known materials can be selected for the heel portion, the toe portion, etc., which are formed of a material other than the shape memory resin, depending on the application of the shoe, if necessary.
Preferable examples include various conventionally known rubbers and the like similar to the shoe sole. Further, the method of manufacturing the shape memory resin shoe of the present invention is as follows.

That is, at least the crepe part of the shoe body, or when the leg cylinder part is present, at least the crepe part and the leg cylinder part are formed of a sheet-shaped uncrosslinked shape memory resin, and
The other parts of the shoe body other than the part made of this uncrosslinked shape memory resin are made of sheet-shaped uncrosslinked rubber, and the shoe socks are made of synthetic fiber and have excellent elasticity and slipperiness. Then, the sheet-shaped parts made of the above-mentioned uncrosslinked shape memory resin or unvulcanized rubber used as necessary, which constitutes the shoe main body with an adhesive, are attached to the surface thereof to form a semi-finished shoe, After drying if necessary, the obtained semi-finished shoes are heated and cured at a temperature not lower than the crosslinking temperature of the shape memory resin or not lower than the crosslinking temperature of the shape memory resin and rubber, and cooled to form a shoe Is a method of manufacturing by removing from the shoe mold. According to this method, the shoe bottom of the shoe body is formed of rubber, and the heel portion, toe portion, etc., which compose the shoe body, can be selected appropriately according to the application of the shoe. It is possible to improve the performance of the shoe according to its application.

Further, the foldable shoe of the present invention forms a sheet-like shape memory resin-pulled cloth having an uncrosslinked shape memory resin layer and a cloth layer with an uncrosslinked shape memory resin and a suitable cloth, With this sheet-shaped shape memory resin drawing fabric, at least the crepe part of the shoe body or at least the crepe part and the leg cylinder part when the leg cylinder part is present are formed together with this shape memory resin draw cloth. The other parts of the shoe body other than the parts are formed of sheet-shaped uncrosslinked rubber, and the shape-memory resin-plied cloth or the shape-memory resin-plied cloth and the uncrosslinked rubber are cut to form each sheet-shaped part. Sewn and / or pasted sheet-like parts to form a semi-finished shoe, and the semi-finished shoe is heated and cured at a temperature above the cross-linking temperature of the shape memory resin or above the cross-linking temperature of the shape memory resin and rubber. To let More, it can also be produced.

[0015]

In the foldable shoe of the present invention, at least the crepe part or the leg cylinder part of the shoe body is formed of the shape memory resin when at least the crepe part and the leg cylinder part are present. By heating to a temperature higher than the glass transition temperature and lower than the melting temperature of the shape memory resin, these limbs and leg cylinders are softened and can be folded into a predetermined shape, and if cooled in the folded state. The folded shape is maintained,
Further, by heating again to a temperature higher than the glass transition temperature and lower than the melting temperature of the shape memory resin, the shape of the shoe is restored to the predetermined shoe shape stored at the time of manufacturing the shoe. Moreover,
The foldable shoe of the present invention has the same strength and comfort as the conventional rubber sole shoe because the shoe sole of the shoe body is formed of rubber.

[0016]

EXAMPLES The present invention will be specifically described below based on examples.

Embodiment 1 FIG. 1 shows a rain boot (boots) according to a first embodiment of the present invention. In this rain boot, the shoe main body (1) is located at the sole (2) of the shoe, the heel part (3) located above the sole part to cover the heel part of the foot, and the foot part located in front of the heel part (3). A toe part (4) covering the toe part of the body, a humor part (5) located above the heel part (3) and the toe part (4) and covering from the limb part of the foot to the ankle, and this limb part (5). ) And a leg tube portion (6) that covers the leg portion of the foot, and the entire shoe body (1) has an average glass transition temperature (Tg) of 4
It is integrally molded by injection molding using a 5 ° C urethane type shape memory resin (trade name: MM-4500, manufactured by Mitsubishi Heavy Industries, Ltd.), and its inner surface is made of synthetic fiber and has elasticity and slipperiness. An excellent backing cloth (not shown) is integrally attached at the time of molding.

Therefore, in the rain boot, since the entire shoe body (1) is formed of the shape memory resin having the glass transition temperature (Tg) of 45 ° C., when it is not used, it is shown in FIGS. 2 and 3, for example. As described above, the Tg is heated to a temperature higher than 45 ° C., for example, 50 to 60 ° C., folded small, and cooled in the folded state to be fixedly stored in the folded shape or carried. In addition, at the time of use, the Tg is higher than 45 ° C., for example, 50 to 6
By heating to 0 ° C., the folded rain boots can be restored to the original shape when they are used.

Embodiment 2 FIG. 4 shows a rain boot and a method for manufacturing the same according to a second embodiment of the present invention. The rain boot of this embodiment is manufactured by the following steps.

First, a polyisoprene type shape memory resin (trade name: TP-301 manufactured by Kuraray Co., Ltd.) having an average glass transition temperature (Tg) of 67 ° C. is used as the shape memory resin (7), and the shoe body (1) is used. The heel portion (3) other than the shoe sole portion (2), the toe portion (4), the limb portion (5) and the leg cylinder portion (6) are formed of a sheet-shaped uncrosslinked shape memory resin, and The shoe sole (2) was made of sheet-like unvulcanized rubber.

Next, the shoe mold (8) for the production of boots is covered with a lining sock (9) made of synthetic fiber and excellent in elasticity and slipperiness, and then the surface of the shoe main body (1) is bonded with an adhesive. ) Which comprises the heel portion (3), the toe portion (4), the heel portion (5), the leg cylinder portion (6), and the sole portion (2) made of unvulcanized rubber, which are included in the above. Wearing shoes and semi-finished products (1
0) was formed.

Then, this semi-finished shoe product (10) is put into a vulcanization canister, and at a temperature of about 100 to 200 ° C., which is higher than the crosslinking temperature of the uncrosslinked shape memory resin and higher than the vulcanization temperature of rubber. Heat to crosslink and cure these uncrosslinked shape memory resin and uncrosslinked rubber to form product rain shoes,
After cooling, the shoe mold (8) was removed.

In this manufacturing process, the heel portion (3), the toe portion (4), the heel portion (5) and the leg tube portion (6) made of uncrosslinked shape memory resin and the shoe bottom portion (2) made of uncrosslinked rubber. In the heat curing step, the peripheral edge portions are fused together.

In the rain boot of this embodiment, all the parts other than the sole (2) of the shoe body (1) are formed of a shape memory resin having a glass transition temperature (Tg) of 67 ° C.,
When not in use, the Tg is the same as in the first embodiment.
The temperature is higher than 67 ° C, for example, 67 to 80 ° C, the parts other than the shoe sole (2) are folded small and cooled in the folded state, so that the folded shape as shown in FIG. In addition to being fixed and stored in or portable, it can be returned to the original shape at the time of use and used as in the above case.

[0025]

INDUSTRIAL APPLICABILITY The foldable shoe of the present invention can restore its shape to the memorized shoe shape when necessary.
When it is not needed, it can be folded small and fixed in the folded shape for storage, or it can be carried, which is convenient for storage and has high practical value.

[Brief description of drawings]

FIG. 1 is a perspective view showing a foldable rain boot according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a method of folding the rain shoe of FIG. 1 and returning it to the original shoe shape.

FIG. 3 is an enlarged perspective view showing the rain boot in the folded state of FIG. 2;

FIG. 4 is an explanatory view showing a manufacturing process of a foldable rain boot according to another embodiment of the present invention.

[Explanation of symbols]

(1) ... Shoe body, (2) ... Shoe bottom, (3) ... Heel,
(4) ... toe part, (5) ... arm part, (6) ... leg tube part,
(7) ... Shape memory resin, (8) ... Shoe mold, (9) ... Lining socks, (10) ... Semi-finished shoes.

Claims (2)

[Claims] 1. The shoe bottom of the shoe body is made of rubber, and at least the crepe part of the shoe body or, if there is a leg cylinder part, at least the crepe part and the leg cylinder part are made of shape memory resin. By being heated to a temperature higher than the glass transition temperature of the shape memory resin and lower than the melting temperature, the shape memory resin can be deformed into a predetermined shape and can be folded, or a predetermined shape stored from the folded shape can be stored. A foldable shoe characterized by being able to return to its shape. 2. The glass transition temperature of the shape memory resin is 40 to.
The foldable shoe according to claim 1, which has a temperature of 70 ° C.