JPH0779804A - Sole of sports shoe and manufacture of sole - Google Patents

Abstract

PURPOSE:To provide a sole of sports shoe which generates less fatigue in walking, etc., by reinforcing sufficiently the foot arch part of the sole undersurface so that its deformation is prevented, wherein provision of the reinforcing member does not cause increase in the weight, and which also assures fine appearance, and also to establish a manufacturing method of such soles. CONSTITUTION:The sole of sports shoe is so structured that the foot arch part 11 of the sole undersurface is reinforced with a reinforcing member 30 which is made of resilient plastic and has a larger strength than the mid-sole body 20, wherein the reinforcing member 30 is joined with the whole undersurface of the foot arch part of the mid-sole body 20 fast in a whole-surface tight attached condition. This reinforcing member 30 is so shaped that it assumes an arch in the longitudinal direction of the sole, that the ends 31 and center 32 about the direction across the width are high, and that each middle part assumes a rib-like recess 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole of an athletic shoe used for running, jogging, training, etc., and a method for manufacturing the shoe sole.

[0002]

2. Description of the Related Art In the case of athletic shoes, since flexibility is required, the main parts such as the midsole are generally made of a relatively soft plastic material, etc. A little hard rubber is used. Then, as an athletic shoe preferably used for running, jogging, training, etc., a portion of the bottom surface of the sole between the tread portion and the heel portion is dented as a tread portion not in contact with the ground. Things are offered. In such an athletic shoe having a tread portion on the bottom surface of the shoe sole, the front sole is provided separately for the front tread portion and the rear heel portion, and the tread portion has a front sole with respect to the midsole. Some were left unstacked.

[0003]

However, in the above-mentioned one in which the outsole is not laminated on the foot part, the strength of the foot part is the strength of only the midsole, and therefore the foot part during walking and running. Has a drawback that it is easily deformed and gives fatigue to the user. In order to eliminate this drawback, it is sufficient to reinforce the step part of the shoe sole.
When the reinforcement strength is increased, there are problems that the reinforcement member becomes thicker, the weight increases, and the appearance of the shoe sole becomes worse.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and the function of preventing the deformation of the tread on the bottom surface of the shoe sole is sufficiently reinforced to reduce fatigue during walking, running, etc., and the weight is also increased by the reinforcing member. It is an object of the present invention to provide a shoe sole of an athletic shoe having a small increase in appearance and a good appearance, and a method of manufacturing such a shoe sole.

[0005]

In order to achieve the above object, the sole of the sports shoe of the present invention has a step portion on the lower surface of the sole.
The sole of an athletic shoe reinforced with a plastic reinforcing member that is stronger and more elastic than the midsole body, and has an arch shape in the sole longitudinal direction on the entire bottom surface of the midstep of the midsole body. It is characterized in that both ends and the center part in the width direction are high, and a plastic reinforcing member in which the middle part thereof is formed into a rib-shaped recess is integrally joined in a state of being in close contact with the entire surface. In the method for manufacturing the sole of the athletic shoe of the present invention, a plastic flat plate material having strength and elasticity higher than that of the midsole body is placed on a lower mold as a female mold having a lower surface shape of the midsole. From the top, match the intermediate formwork in which the side circumference shape of the midsole is hollowed out, and put the material for the midsole body that should compose the midsole body in the intermediate formwork. A reinforcing member made of plastic, which has an arch-like shape at least in the longitudinal direction of the sole on the entire lower surface of the step of the midsole by intruding into the mold hole for the midsole obtained by the mold and the intermediate formwork and applying pressure. Is a method for manufacturing a shoe sole, in which an integrally molded midsole is obtained in a state of being in close contact with the entire surface, wherein the lower mold is provided with a part which constitutes a step part of the midsole. A bulging portion corresponding to the arch-like shape having a width exceeding the widthwise dimension of the swelling portion, and placing the plastic flat plate material outside the step forming portion of the midsole of the bulging portion. The fitting pin is erected at the highest position of the area on which the allowance is placed, a recess for avoiding contact with the fitting pin is provided on the lower surface of the intermediate formwork, and the placement allowance area of the plastic flat plate material is provided. A pin hole is formed in advance at a position corresponding to the fitting pin, and the flat plate material made of plastic is fitted to the fitting pin through the pin hole and placed and positioned on the lower mold. There is.

[0006]

According to the features of the sole of the sports shoe of the present invention, the entire lower surface of the step portion of the midsole body is closely adhered and integrally joined by the plastic reinforcing member, and the plastic sole member is formed in the longitudinal direction of the sole. The reinforcing member made of arch is reinforced in the shape of an arch, and the reinforcing member made of plastic in the shoe sole width direction has a shape in which both ends and the central portion are high and the middle portion is recessed in a rib shape, that is, a W shape. It is reinforced with a cross-sectional shape. Therefore, the reinforcing member made of plastic can have sufficient structural strength against deformation due to the arched shape in the longitudinal direction and the W-shaped cross section in the widthwise direction, and the thickness and the like can be reduced and the weight can be reduced. As a result, the sole of the shoe itself does not become heavier as a whole while maintaining the motor function by providing the tread portion, it looks good (thick reinforcement member does not enter), and the tread portion is sufficiently reinforced, The user will not be fatigued due to the deformation of the sole. Further, according to the feature of the method for manufacturing the sole of the athletic shoe of the present invention, a pin hole is opened corresponding to the fitting pin position of the lower mold in the mounting allowance of the plastic flat plate material, and The flat plate material is placed on the bulging portion of the lower mold by the placement allowance, with the fitting pin and the pin hole positioned. Then, an intermediate form is fitted from above, and the material for the midsole body is put therein, and further pressure is applied by pressing with an upper mold under appropriate heating. As a result, the flat plate material made of plastic and the material for the main body of the midsole are closely adhered and integrated, and a midsole having a certain shape, size and thickness is molded, and the step part of the midsole is made into an arch shape by the plastic reinforcement member. Reinforced. In order to reinforce the arch part of the midsole with a plastic reinforcing member, it is necessary to provide a bulging portion corresponding to the lower mold, and it is necessary to place a plastic flat plate material on this bulging portion. . However, since the flat plate is placed on the curved bulging portion, only a part of the flat plate contacts the bulging portion. Therefore, the position of the flat plate is likely to be displaced when the intermediate mold is further placed from above, and there is a possibility that the plastic flow of the plastic flat plate material may not be performed evenly even during the subsequent pressing by the upper mold. In the present manufacturing method, while the plastic flat plate material is placed on the bulging portion of the lower die, the pin holes of the placement allowance of the plastic flat plate material are fitted to the fitting pins of the lower die, Even if the intermediate formwork is fitted, the position of the plastic flat plate material does not shift. Further, the plastic flat plate material can be plastically worked in a certain state even when the upper die is pressed thereafter. Therefore, it is possible to manufacture a shoe sole in which the midsole tread is plastically reinforced in an arch shape, which is a preferable shape for reinforcement, with little variation in performance and manufacturing.

[0007]

1 to 3 are views for explaining an embodiment of a shoe sole of an athletic shoe of the present invention, FIG. 1 is a perspective view of a midsole viewed from the lower side, and FIG. 2 is a side view of the midsole. 3 is a sectional view taken along line XX in FIG. 4 to 6 are views for explaining an embodiment of a method for manufacturing a shoe sole of an athletic shoe according to the present invention, and FIG. 4 is a manufacturing mold and a material for a midsole viewed from a direction along the longitudinal direction of the shoe sole. FIG. 5 is a perspective view of the lower mold of the manufacturing mold, and FIG. 6 is a cross-sectional view of the manufacturing mold and the material for the midsole, which are crossed at a position corresponding to the step portion of the shoe sole.

An embodiment of the sole of the sports shoe of the present invention will be described with reference to FIGS. 1 to 3. The shoe sole generally comprises an inner sole, a midsole, and a front sole, and the midsole 10 is shown from the lower surface side in FIG. The midsole 10 is composed of a midsole main body 20 that constitutes the overall shape, and a plastic reinforcing member 30 that is entirely in close contact with the step portion 11 on the lower surface of the midsole 10. The front soles are attached to the stepping portion 22 and the heel portion 23 of the midsole body 20, respectively, to form the actual shoe soles. On the other hand, the midsole portion of the midsole main body 20 and the heel portion 23 are not provided with a front bottom that is in contact with the ground, and are formed as a depressed step portion 21. A plastic reinforcing member is attached to the step portion 21 of the midsole body 20. The midsole body 20 can be configured using a material having a good shock absorbing property, such as EVA (ethylene-vinyl acetate copolymer) sponge. Further, in the thick portion corresponding to the tread portion 21, a part 24 is provided with a shape-retaining performance in addition to the shock absorbing property, that is, a region 24 slightly harder than other midsole body portions may be provided. Good. Of course, other portions may be replaced with other functional areas as needed. In addition, 25 is a flange piece protruding to both upper ends of the midsole body,
The part that is combined with the upper.

The plastic reinforcing member 30 has an arch shape in the longitudinal direction of the shoe sole, and its both end portions 31 and the central portion 32 are high in the width direction perpendicular to the longitudinal direction, and the middle portion thereof is high. Is formed in the rib-shaped recess 33. The plastic reinforcing member 30 having such a shape is integrally joined in close contact with the entire step portion 21 of the midsole body. With the arched shape, the pressing force from above and the restoring force are increased. Also, the widthwise ends 31 and the central portion 32 are high,
By forming the rib-shaped concave portion 33 at the intermediate portion, the cross-sectional shape in the width direction becomes an uneven shape with ribs such as a W shape, and the strength is increased. Therefore, the thickness of the plastic reinforcing member 30 itself can be reduced, the weight can be reduced, and the reinforcing shape having a good appearance can be obtained. The plastic reinforcing member 30 may be made of a material having strength and elasticity higher than that of the midsole body 20, for example, a solid sheet of PUE (Polyurethane Elastomer) or EVA.

Next, an embodiment of the method for manufacturing the sole of the athletic shoe according to the present invention will be described with reference to FIGS. The manufacturing mold used is the lower mold 40, the intermediate mold 50, and the upper mold, while the material for the midsole body is used as the material for molding the midsole 10.
200 and a plastic slab 300 for the plastic stiffener 30 and, in addition, a partial material 240 for a slightly harder region 24 that is molded as part of the tread 21 of the midsole body 20 .

In the embodiment, the lower mold 40 as the female mold is designed to mold a pair of left and right midsole at the same time.
A bulging portion 41 that bulges like an arch in the longitudinal direction of the sole is provided. The bulging portion 41 has at least a widthwise dimension exceeding the widthwise dimension W of the tread portion 11 so that the placing margin 301 of the plastic flat plate material 300 can be placed on the bulging portion 41. . The swelling portion 41 of the lower mold 40 has the midsole 10
A three-dimensional shape to form the step portion 11 of the is formed. And this three-dimensional shape is the plastic flat plate material
It is also a mold for three-dimensionally molding 300 into a plastic reinforcing member 30 that adheres to the midsole body 20. Bulge
The three-dimensional shape of 41 is a shape that bulges in an arch shape in the longitudinal direction of the sole, and in the width direction at right angles to it, both end portions 41a and central portion 41b are raised, and the middle portion thereof is a rib-shaped recess. Formed on 41c. The bulging portion 41 is further provided with a mounting portion 41d composed of a shallow step portion for mounting the mounting margin 301 of the plastic flat plate material 300 on the outside of the step portion 11 constituting region of the midsole 10. The fitting pin 42 is provided upright on the highest position of the mounting portion 41, that is, the mounting portion 41 at the highest position of the bulging portion 41. The fitting pin 42 has a shape such that the plastic flat plate member 300 that fits therein is not easily lifted up, for example, a cylindrical shape rather than a conical shape. When the flat plastic plate material 300 is placed on the bulging portion 41 of the lower mold 40 with the mounting allowance 301, the plastic plate material 300 contacts only the highest position portion of the bulging portion 41. is there. Therefore, when the intermediate formwork 50 described later is fitted from above, the plastic flat plate material 30 is used.
0 is easy to shift. However, by providing the fitting pin 42 at the highest position of the bulging portion 41, the fixed state of the plastic flat plate member 300 is improved.

The intermediate formwork 50 has a hole shape 51 in which the side circumferential shape of the midsole 10 is hollowed out in order to form the thick portion of the midsole 10, and the lower surface has the above-mentioned lower shape. It has a planar shape that can be brought into contact with the upper surface of the mold 40 to be fitted together. Further, an avoiding recess 52 is formed on the lower surface of the intermediate mold 50 to avoid collision or contact with the fitting pin 42 formed in the lower mold 40. Of course, this avoidance recess 52
Does not need to be formed when the fitting pin 42 is configured not to project from the bulging portion 41 of the lower mold 40. The upper mold 60 has a male mold portion 61 that penetrates into the mold hole for the midsole obtained by the lower mold 40 and the intermediate mold 50, and the midsole material 200, 240 previously inserted by the male mold portion 61.
, 300, press them together and bond them together and form the whole into a desired midsole shape.

As the material 200 for the midsole body, for example, an EVA sponge body is used, and this is cut into an appropriate shape in consideration of the shape of the midsole body after molding. As described above, the partial material 240 is a material applied to the slightly hardened region 24 for slightly increasing the strength of the step portion 21 of the midsole body 20, and is the same as the material 200 for the midsole body, for example. The EVA sponge body is used, but a material slightly harder than the midsole body material 200 is used. The shape is made into an appropriate shape so as to be a part or the whole of the step part 21 of the midsole body 20 after molding, and it is cut in advance. The plastic flat plate material 300 for the plastic reinforcing member 30 is, for example, as described above, PUE (polyurethane elastomer) or EV.
The solid sheet A can be used, but any material having strength and elasticity higher than that of the midsole body 20 may be used. A thermoplastic plastic material is preferable for three-dimensionally processing the flat plate member 300. The shape or size of the flat plate material 300 made of plastic is set to be slightly larger than the plane size of the step part 11 of the midsole 10, and a mounting allowance 301 is provided around this, and this mounting allowance 301 is the lower mold 40. It corresponds to the mounting portion 41d. The mounting allowance 301 of the plastic flat plate material 300 includes the mounting portion described above.
The pin hole 302 is located at a position corresponding to the fitting pin 42 provided in 41d, that is, a position (highest position) where the flat plate member 300 made of plastic comes into contact with the bulging part 41 when the plastic plate material 300 is placed on the bulging part 41 of the lower mold 40.
To form.

To form the midsole 10, first, place the plastic flat plate material 300 on the bulging portion 41 of the lower mold 40, and make a pin hole.
The 301 is fitted into the fitting pin 42 of the lower mold 40. The plastic flat plate material 30 is previously roughened with a chemical or the like on the surface integrally joined to the midsole body 20 (primer treatment).
Then, the adhesive film that is compatible with the material of the midsole body 20 is closely attached. The plastic plate member 300 placed on the bulging portion 41 of the lower mold 40 is actually in contact with the bulging portion 41 only near the highest position of the bulging portion 41 (see FIG. 4). reference). Next, the intermediate mold 50 is lowered and fitted onto the lower mold 40. This forms a hole shape corresponding to the overall shape of the midsole 10. At the same time, the plastic flat plate material 300 is curved so that the entire placing allowance 301 comes into contact with the placing portion 41d of the lower die and the intermediate form 50
Sandwiched between. At that time, the plastic flat plate material 30
Since 0 is fitted into the fitting pin 42 on the lower die 40 side by the pin hole 302, the entire placement allowance 301 is brought into contact with the lower die 40 in an accurate positioning state without displacement.

Next, the midsole body material 200 is put into the intermediate form 50. If necessary, hollow out the part corresponding to the tread part 21 in advance and place the partial material 24 on the part.
Put 0. The partial material 240 is mechanically roughened (for example, buffed) so that the partial material 240 becomes a part of the midsole body 20 with sufficient bonding after molding and also adheres to the plastic reinforcing member 30. Is good. Material 20
When the installation of 0, 240, 300 in the mold is completed, the whole is heated to an appropriate temperature, and in this state, the hot compression press work by the upper mold is performed. The appropriate temperature is 200 or 240 for each material.
, 300 is the temperature at which it softens properly. However, the temperature is, for example, 110 to 120 ° C. for the EVA material. After pressing, the product is cooled and taken out.

By pressing as described above,
The plastic flat plate material 300 has an arch shape in the longitudinal direction of the shoe sole, and the both end portions 31 and the central portion thereof in the width direction.
32 is high, and is molded into a three-dimensional plastic reinforcing member 30 in which a rib-shaped recess 33 is formed in the middle, and is integrally molded on the entire bottom surface of the step part 11 of the midsole 10 in a tightly bonded state. It At this time, the plastic flat plate member 300 is prevented from being displaced and positioned by the fitting pin 42 located at the highest position of the bulging portion 41 of the lower mold 40 in the pin hole 302 thereof. Not only when matching molds,
It is stably held at a predetermined position even during press working by the upper die 60, and the press working is performed by the stable plastic flow. The partial material 240 is the material 20 for the midsole body.
It is pushed into the inside of 0, and the tread part 21 of the midsole body 20
Become part of.

[0017]

The present invention has the above-described structure and operation. According to the shoe sole of an athletic shoe according to claim 1, the sole is provided on the entire lower surface of the tread portion of the midsole body in the athletic shoe sole. Since the plastic reinforcing members which are arched in the longitudinal direction and whose both ends and the central part are high in the width direction and whose middle parts are each formed into a rib-shaped recess, are integrally joined in a state of being in close contact with each other. The plastic reinforcing member itself can have a sufficient structural strength against deformation. Therefore, it is possible to reduce the thickness of the plastic reinforcing member and reduce the weight thereof, and as a result, the sole of the shoe becomes heavier as a whole while maintaining the exercise function by providing the tread portion. In addition, the appearance is good (a thick reinforcing member does not enter), the tread is sufficiently reinforced, and the user is not fatigued due to deformation of the shoe sole. Further, according to the method for manufacturing the sole of the athletic shoe according to claim 2, the lower mold has a width in a portion of the midsole which is to constitute the tread portion and exceeds a widthwise dimension of the tread portion. , Constructing a bulging portion corresponding to an arch shape, and fitting the bulging portion outside the step forming portion of the midsole of the bulging portion and in the highest position of the region where the placing allowance of the flat plate material made of plastic is placed. The fitting pin is provided upright, and the fitting pin and the intermediate formwork are not in contact with each other.
A pin hole is previously formed at a position corresponding to the fitting pin in the placement allowance region of the plastic flat plate material, and the plastic flat plate material is fitted into the fitting pin through the pin hole to form a lower mold. Since it is arranged to be placed and positioned at, when mounting the flat plate material made of plastic on the bulging portion of the lower mold, by fitting the pin hole of the mounting allowance of the flat plate material made of plastic with the fitting pin of the lower mold, Positioning is easy. After that, when the intermediate formwork is fitted, even if the plastic flat plate member is curved, the positional deviation can be prevented. Further, the plastic flat plate material can be plastically worked in a certain state even when the upper die is pressed thereafter. Therefore, it is possible to manufacture a shoe sole reinforced with an arch-shaped plastic shoe sole, which is a preferable shape for reinforcement, without variations in performance and manufacturing.

[Brief description of drawings]

FIG. 1 is a view for explaining an embodiment of a shoe sole of an athletic shoe of the present invention, and is a perspective view of a midsole viewed from a lower surface side.

FIG. 2 is a side view of the midsole.

3 is a sectional view taken along line XX of FIG.

FIG. 4 is a view for explaining one embodiment of the method for manufacturing the shoe sole of the sports shoe of the present invention, which is a side view of the manufacturing mold and the material for the midsole as seen from the direction along the longitudinal direction of the shoe sole. .

FIG. 5 is a perspective view of a lower mold of the manufacturing mold.

FIG. 6 is a cross-sectional view of a material for a manufacturing die and a midsole, which is crossed at a position corresponding to a step portion of a shoe sole.

[Explanation of symbols]

 10 Midsole 11 Stepping part 20 Midsole body 21 Stepping part 30 Plastic reinforcing member 31 Both ends 32 Center part 33 Rib-shaped recess 40 Lower mold 41 Bulging part 41 Fitting pin 50 Middle mold 60 Upper mold 200 Midsole body material 300 Plastic flat plate material 301 Mounting allowance 302 Pin hole

Claims (2)

[Claims] 1. A shoe sole of an athletic shoe, in which the tread portion of the bottom surface of the sole is reinforced by a plastic reinforcing member having strength and elasticity greater than that of the midsole body, the bottom surface of the tread portion of the midsole body. A plastic reinforcing member, which has an arch shape in the longitudinal direction of the sole and a high height at both ends and the central portion in the width direction, and whose middle portion is a rib-shaped recess, is integrally formed on the entire surface in close contact. Sole of athletic shoes characterized by being joined. 2. A plastic flat plate material having a strength and elasticity higher than that of the midsole body is placed on a lower mold as a female mold having a lower surface shape of the midsole, and a side circumference shape of the midsole is determined from above. The intermediate molds that have been hollowed out are put together, and the material for the midsole body, which constitutes the midsole body, is placed in the intermediate mold, and the upper mold is obtained by the lower mold and the intermediate mold under an appropriate heating condition. By intruding into the mold cavity for the midsole and applying pressure, a plastic reinforcing member having an arch shape is integrally molded on the entire lower surface of the midsole in the at least longitudinal direction of the shoe sole so as to be in close contact with the entire surface. A method of manufacturing a shoe sole for obtaining a midsole, wherein the lower mold has a width that exceeds a width direction dimension of the tread in a portion that constitutes the tread of the midsole. Therefore, the bulging portion corresponding to the arch shape is formed, and the highest position of the bulging portion outside the step forming portion of the midsole and in which the mounting allowance of the plastic flat plate material is placed. The fitting pin is erected at the position, and the fitting pin and the intermediate formwork are not in contact with each other, and the corresponding position of the fitting pin in the placement allowance region of the plastic flat plate material. A shoe sole of an athletic shoe, characterized in that a pin hole is formed in advance, and the flat plate material made of plastic is fitted into the fitting pin through the pin hole and placed and positioned on the lower mold. Manufacturing method.