JPH0625126Y2 - Injection molded insoles - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insole used for a shoe formed by injection-molding the outsole, and in particular, the air trapped in the outsole material when the outsole is injection-molded outside the mold. The present invention relates to an insole that can be released and help the movement of air in the shoe when wearing the shoe to prevent stuffiness in the shoe.

[0002]

2. Description of the Related Art In recent years, in the field of shoes in which comfort is being prioritized for design, shoes whose soles (main soles) are made of a material having excellent shock absorption such as urethane foam are attracting attention. Are gathering. The outsole made of such a material is usually a last mold in which a member (adhesion body) in which a cover and an insole are adhered is suspended, a bottom mold located below the last mold, and a position lateral to both molds. Is formed by injecting (injecting) self-foaming polyurethane, for example, and is integrated with the adhesive body.

[0003]

When forming the outsole by injection molding as described above, when the outsole material is injected (injected) into the cavity, air is entrained together with the outsole material. Sometimes. This air causes bubbles to form at the outsole. If the bubbles are large, the mechanical strength of the outsole is reduced and the durability of the outsole is impaired. Further, when bubbles are present on the outer circumference of the outsole, the appearance of the outsole is impaired, which is a so-called lack of design. If there is a large lack of design (that is, the bubbles formed on the outer circumference are large),
It cannot be commercialized and contributes to a decrease in yield.

As a measure against the above-described lack of design, conventionally, a large number of fine holes are provided in the lower side surface portion of a non-breathable cover such as a synthetic resin cover to allow air to escape from the fine holes. Means such as sewing a sewing thread on the lower side surface of the cover to release air from the gap between the fibers constituting the thread, or providing an air vent hole in the side mold are adopted. However, in the former two cases, micropores and threads are conspicuous because they exist outside the covering, and when they are ugly, new measures are needed to camouflage the micropores and threads. In the latter case,
The manufacturing cost of the mold is soaring.

Further, when the outsole is made of the above-mentioned injectable material (that is, the above-mentioned self-foaming synthetic resin such as polyurethane), when a shoe having such an outsole is worn. As is well known, the circulation of air inside shoes is poor,
There is a considerable sense of stuffiness in the shoes. This feeling of stuffiness diminishes the good comfort of the shoe in which the outsole is made of a material having excellent shock absorption.

In consideration of the above points, the present invention makes it easy and conspicuous from the outside to form air bubbles in the bottom by letting air trapped during injection molding of the bottom out of the mold. It is an object of the present invention to provide an insole for injection-molded shoes, which can be prevented without causing any trouble, and at the same time, can help the movement of air inside the shoe to prevent stuffiness inside the shoe.

[0007]

In order to achieve the above-mentioned object, the insole of the present invention has an open cell in at least one of the lower surfaces of the insole of the table having an arbitrary number of through holes in the stepped portion. It is characterized in that a back insole having at least one through hole is present in each of the outer peripheral portion of the stepping portion and the rear end portion of the heel portion via a cushioning material having a good property.

[0008]

[Function] In the insole of the present invention, through holes in the front insole and the back insole,
The continuous air bubbles of the cushioning material interposed between the front and back insole ensure air circulation between the upper surface and the lower surface of the insole. That is, when the air on the lower surface side of the insole of the present invention moves for some reason, first, at least one through hole in each of the outer peripheral portion of the stepping portion and the rear end portion of the heel portion of the back inner sole. Through the inside of the insole. Inside the inner bottom, there is a cushioning material that is open-celled at least at any one part, and air flows through the continuous cells of the cushioning material and reaches the front middle bottom. The front insole has an arbitrary number of through holes in the stepped portion, and the air flows through the through holes to the upper surface side of the front insole, that is, the upper surface side of the insole of the present invention. Further, when the air on the upper surface side of the insole of the present invention moves, the air flows to the lower surface side of the insole of the present invention by following the route opposite to the above. In this way, air circulation is secured between the upper surface side and the lower surface side of the insole of the present invention.

When the outsole is injection-molded using the insole having the above-mentioned air circulation function, air is entrained when the outsole material is injected (injected) into the cavity in the mold. , With the air existing in the cavity before the injection, flows through the inside of the cavity, through holes in the outer periphery of the stepping part on the back inner bottom and the rear end of the heel part → open cells of the cushion material → in the table It flows to the upper surface side of the insole of the present invention through the path of the through hole of the bottom stepped portion. On the upper surface side of the insole of the present invention, there is a last mold in which the adhering body is suspended as described above, and air passes through the minute gap between the last mold and the adhering body to the outside of the mold. escape. For this reason, air does not exist in the cavity, and formation of bubbles on the outsole and eventually formation of defective design is prevented.

Further, the bottom material injected (injected) into the cavity also partially enters the inside of the insole from the through holes of the outer periphery of the stepping part of the back insole and the rear end of the heel part. However, the outsole material can penetrate the cushion material but cannot pass through the open cells. For this reason, the main bottom material that has entered the inside of the inner bottom is cooled and hardened in a state of partially permeating the cushion material. This hardened outsole material serves to strengthen the bond between the outsole formed in the cavity and the insole of the present invention.

Furthermore, when running or walking while wearing an injection-molded shoe using the insole of the present invention, the inside of the shoe (for example, a gap between the outsole and the insole, the inside of the insole, or the insole). And the insole, etc.) causes air movement. As described above, this air flows through the through holes in the outer periphery of the stepping part on the back insole and the rear end of the heel.
Cushioned open cell → Path of the through hole in the front insole, or the reverse of the through hole in the front insole → Open air in the cushion → Outer periphery of the insole on the back insole The upper and lower surfaces of the insole of the present invention flow through the paths of the through holes of the rear portion of the heel portion and the heel portion. In addition, in the injection-molded shoe using the insole of the present invention, the air flowing to the upper surface side of the insole passes through a minute gap generated between the foot cover and the foot by the movement of the foot during running / walking. While escaping to the outside, the outside air enters the inside of the shoe through this gap, that is, the upper side of the insole, and follows the above route to reach the lower side of the insole to ventilate the air inside the shoe and the outside air. . The ventilation with the outside air and the circulation of the air inside the shoe eliminates the feeling of stuffiness and realizes an injection-molded shoe that is comfortable to wear.

[0012]

1 and 2 are views for explaining one embodiment of the insole of the present invention. FIG. 1 is an exploded perspective view and FIG. 2 is a sectional view. In FIGS. 1 and 2, reference numeral 1 denotes a table midsole having an arbitrary number (23 in this example) of through holes 11 in the stepped portion, and at least any of the locations (in this example, the whole) on the lower surface side. The back insole 3 is present via the cushion material 2 which is open-celled. At least one outer peripheral part of the stepping part and the rear end part of the heel part of the back insole 3 (in this example, seven outer peripheral parts of the stepping part and one part at the rear end part of the heel part) Through hole 31,
Has 31.

The above-mentioned through holes 11 and 31 are essentially
It may act as an air flow hole, but in order to secure the bonding strength between the outsole and the insole as described above, the through hole 31 of the back insole 3 is such that a small amount of the outsole material can enter. The size is preferably However, if a large amount of the bottom material enters, it not only hinders the cushioning action of the cushion material 2, but also fills the open cells or the through holes 31 and 11 of the back inner bottom 3 and the front inner bottom 1 to allow the flow of air. It is preferable that the through hole 31 is not too large, because it may hinder the operation. Moreover, the through hole 31 is a place where the material of the outsole does not easily enter in a large amount, and the bonding strength between the outsole and the insole can be effectively secured with a small amount of invasion. It is better to have it at the rear end. Furthermore, in the above example, as shown in FIG.
A synthetic resin film 3b is adhered to a non-woven fabric or a woven fabric 3a (the through-holes 31 mentioned above are made of these layers 3
a, 3b) and the film 3b.
This prevents the (massive) entry of the bottom material into the insole. In addition, the through hole 11 of the bottom 1 in the table should not be too large, because if it is too large, the feeling of hitting the foot will be impaired. in addition,
Since the through hole 11 of the insole 1 of the table acts exclusively as an air circulation hole, it is sufficient if the through hole 11 exists in the stepped portion where air is easily moved when wearing shoes.

Further, in the example shown in FIGS. 1 and 2, the cushion material 2 used is one having an open cell structure as a whole,
Since the open air bubbles are for ensuring the circulation of air in the cushion material 2, any one of the portions of the cushion material 2, for example, one of the stepped portion, the stepless portion, and the heel portion, or 2
It suffices if it exists at a location, the central portion or the outer peripheral portion of the cushion material 2, and the remaining portion may have closed cell properties.

FIGS. 3 (A) and 3 (B) are views for explaining the mode of injection molding of the outsole using the insole of the present invention constructed as described above. (A) is a longitudinal sectional view, and (B) is a lateral sectional view. In FIGS. 3 (A) and 3 (B), an outsole material (for example, self-foaming polyurethane, foaming rubber, foaming PVC resin, EVA resin, etc.) 4 is provided in a cavity in the mold (not shown).
Is injected (injected), the air 5 entrained in the cavity at the time of the injection and the air 5 existing in the cavity are pushed by the bottom material 4 and the through hole 31 side of the back inner bottom 3 side. To enter the inside of the insole from the through hole 31, pass through the continuous bubbles of the cushion material 2, as shown by the arrow,
Through the through hole 11 of the above to the upper surface side of the bottom 1 in the table. On the upper surface side, there is a last mold 7 into which the insole body of the present invention and the cover 6 are caught, and air is present between the last mold 7 and the bottom 1 of the table and cover 6. Escape to the outside through the gap (not shown). Therefore, air does not exist in the cavity, in other words, in the book bottom 4, bubble formation in the book bottom 4 is prevented, and thus the design failure of the book bottom 4 is prevented.

Then, a small amount of the main bottom material 4 enters the inside of the insole from the through hole 31 of the back insole 3, cools in the vicinity of the through hole 31, and in a region 8 shown by a dotted line in FIGS. 1 and 2. Harden.
This cooled and hardened outsole material 8 firmly bonds the back insole 3 and thus the insole to the outsole 4 of the present invention.

When running or walking while wearing a shoe having the outsole 4 formed in the manner shown in FIGS. 3 (A) and 3 (B), if air moves inside the shoe as the foot moves, The air flows through the through holes 11 and 31 of the front midsole 1 and the back midsole 3 and the cushion material 2
Flow inside the shoe through the continuous air bubbles and partially escape to the outside of the shoe, and outside air enters the inside of the shoe and is ventilated. As a result, the stuffy feeling of the shoe is eliminated, and comfortable wearing comfort can be obtained.

[0018]

As described in detail above, according to the insole of the present invention, by the through holes of the front insole and the back insole, and the continuous bubbles of the cushion material interposed between these front and back insole. Since the air circulation is ensured between the upper surface side and the lower surface side of the insole, the following effects can be obtained. (1) When the outsole is injection-molded using the insole of the present invention, the air entrained in the cavity in the mold due to the injection (injection) of the outsole material enters the cavity before the injection. Along with the existing air, it escapes to the last mold side through the through holes in the front and back insole and the continuous air bubbles of the cushion material, and finally escapes to the outside of the mold. As a result, the air in the cavity is eliminated, and the formation of bubbles on the outsole and the formation of a defective design are prevented. (2) As described above, according to the insole of the present invention, the design of the outsole due to injection molding is prevented by the insole, which is a member inside the shoe. There is no concern of impairing the appearance of the product because it does not appear on the outside of the shoe as a measure against the lack of design that appears on the outside of the shoe like a fine hole or a sewing thread sewn to the portion. (3) Further, as compared with the conventional measures against the design defect in which the side mold is provided with the air vent hole, the design defect can be prevented at an extremely low cost. (4) Further, a certain amount of the bottom material enters into the inside through the through hole in the back inside, and this cools and hardens to strengthen the connection between the inside bottom of the present invention and the injection bottom. Therefore, when the injection-molded shoe with the insole of the present invention is worn, the feeling of unity between the outsole and the insole is maintained to improve the wearing comfort and the durability of the shoe. (5) Moreover, the formation of large bubbles inside the outsole which reduces the mechanical strength of the outsole can be prevented, and the life of the shoe is significantly extended. (6) Also, when an injection-molded shoe with the insole of the present invention is worn, movement of air occurs inside the shoe, and this air passes through the through holes of the front and back insole and the continuous air bubbles of the cushioning material to cause the present invention. It can flow to the upper surface side and the lower surface side of the insole, and can also be ventilated with the outside air. As a result, the stuffiness of the shoes is eliminated, resulting in a comfortable wearing comfort.

[Brief description of drawings]

FIG. 1 is an exploded perspective view illustrating an embodiment of an insole according to the present invention.

FIG. 2 is a cross-sectional view of the insole of the present invention shown in FIG.

FIG. 3 is a view for explaining a mode of injection molding the outsole using the insole shown in FIGS. 1 and 2;
(A) is a vertical cross-sectional view and (B) is a horizontal cross-sectional view.

[Explanation of symbols]

 1 Front insole 2 Cushion material 3 Back insole 11 Through hole in front insole 31 Through hole in back insole 3

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral portion of the stepping portion and a heel portion are provided on the lower surface of the front insole having an arbitrary number of through holes in the stepping portion through a cushioning material having at least one of the open pores. An insole for injection-molded shoes, characterized in that a rear insole having at least one through hole is present at each of the rear end portions.