JPH0767704A - Shoe sole material and pattern molded shoe sole - Google Patents

Abstract

PURPOSE:To improve restoring force from bending, shock absorbability and shape retainability of shoe soles and make them strong against twisting by molding shanks and heel cores in one piece. CONSTITUTION:As a bottoming part 1', a shank 3' formed according to the line of the shoe sole 5' of a high heel and a heel core 2' to be inlaid within the heel 4a' are molded in one piece. Hence, the shoe sole 5' is reinforced sufficiently by a single bottoming part 1' from the heel 4a' to the arch of the foot and the shank 3' and the heel core 2' absorb and support the load together. Accordingly, the shape retainability of shoe sole 5' becomes quite high, different from the former shoe soles where heel cores and shanks are inlaid in shoe soles separately or together by fixing them with screws. In addition, the restoring force from the ordinary bending in the up and down direction and the twisting bending at the time of wearing becomes quite stable. Further, it never happens that the broken tail of the shank 3' on the heel side comes out to the side facing foot as it is molded or connected with the heel core 3' in one piece. In the case of one piece molding, such performance and effect is remarkable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel shoe sole member and a molded shoe sole using the shoe sole member, and in particular, a shoe sole having a heel step and an embedded heel core is formed by molding. At the same time, the present invention relates to a shoe sole member and a molded shoe sole that are suitable for manufacturing a shoe in which the shoe sole is fixed to a cover member.

[0002]

2. Description of the Related Art For business shoes for ladies and women's shoes, a sole having a heel step (sole with heel) is often used for customary reasons or for improving wearability. Further, so-called casual shoes have the shoe sole with the heel. Particularly in shoes that emphasize fashionability, a large heel step is formed. Generally, a load (for example, a load during normal walking / running, an impact load, etc.) is applied to the heel part of a shoe when it is worn, and a drop force or a bending force is applied to the non-step part due to the same load. To do. Therefore, the heel part needs to have a high-strength structure that can withstand the above-mentioned load, while the non-stepped part needs to be prevented from falling and the resting part needs to be restored to bend when running or walking. In order to maintain a comfortable wearing feel, the shape-retaining property is required for the integrated part of the stepless part and the heel part (the part behind the toe part of the sole).

Usually, in hand-sewn shoes such as leather shoes, the heel portion is made of hard leather or hard plastic, and the non-stepped portion is
For example, a shank material made of a material having rigidity and flexibility such as steel plate, bamboo material, wood, fiber, and plastic is attached to meet the above requirement.

By the way, in recent years, the structure and design of shoe soles have been diversified, and a portion (for example, a portion having high abrasion resistance) made of a material different from the material of the shoe sole body is formed in a part of the shoe sole. Alternatively, the wearability and the design are further enhanced by forming a portion different from the color of the sole body. For example, in an injection-molded shoe, a shoe sole made of a plurality of materials and a plurality of colors can be formed by performing the injection a plurality of times.

More recently, from the viewpoint of anatomical engineering, shoes having an anatomy structure, which emphasizes the shape of the sole and the mechanism of weight movement during walking, have been receiving attention. In shoes like this,
Although it is necessary to design the foot contact surface shape of the shoe sole in consideration of the soles of the human body, it is not easy to realize the shape with a hand-sewn shoe. In order to obtain a good feel of contact with the ground, it is preferable to use a material having a certain elasticity as the sole material. However, the sole having such elasticity is made of urethane, rubber, etc. rather than being sewn by hand. Manufacturing by mold molding (injection molding or press molding) that can be used as a material is suitable.

However, in manufacturing shoe soles having a heel step by molding, in order to cope with diversification of shoe sole structures and designs, at the same time to realize an anatomy structure, or to obtain excellent shape retention of the entire sole. Has various problems as described below.

[0007]

That is, conventionally, in the case of manufacturing a shoe sole having a heel step by, for example, injection molding, a shank or a shank is attached to the bottom surface of the insole sewn on the cover to be attached to the last mold. By temporarily installing the heel core,
The shank and heel core can be mounted inside the mold. Also,
By embedding a heel core or shank in the shoe sole by injection molding, or by using a dummy mold, form a groove for embedding the shank or heel core on the foot contact surface of the shoe sole (that is, the foot contact surface of the outsole) Then, a shank or a heel core is attached in the groove using an adhesive or the like.

However, in order to embed the shank or heel core in the shoe sole at the time of injection molding, it is troublesome to temporarily temporarily attach the shank or heel core to the bottom surface of the insole etc. A preliminary process is required. Also, when attaching a shank or heel core in the groove for embedding using an adhesive or the like,
In addition to the individual steps similar to the above, it also requires the work of attaching the inside material such as the insole and shank cover.
The advantage of mold forming that the manufacturing process can be simplified is also lost. Also, due to repeated bending of the stepless part, the fixing of the shank to the shoe sole is released within a short period of time,
There is also the problem of the shank breaking through to the sole side.

In addition, in general, when a shoe sole having a heel step is formed by injection molding, a shoe sole having a good foot contact can be obtained, but when the shoe sole is thin, a shank is provided. However, in some cases, the integrity of the stepless part and the heel part may be poor. In this case, the shape retention of the entire shoe sole is deteriorated, and the rigidity and the resilience to the twist of the boundary portion between the stepless portion and the heel portion are poor, which causes a disadvantage that the wearing feeling is significantly reduced. . The same problem as described above occurs when the shoe sole is manufactured by press molding. As described above, a shoe having a normal heel step or a shoe having a large heel step and a thin sole such as a high heel is generally not easy to form the shoe sole by molding, and thus, these shoes have been conventionally used. Most of the hand-sewn and hand-sewn items were used.

By the way, conventionally, the upper end of the shank is fixed to the upper surface of the heel core material with a screw, and the heel piece (that is, synthetic rubber or synthetic resin piece attached to the ground contact surface of the heel is attached to the lower surface of the heel core material). , Which is generally replaced when worn out by wearing shoes) is nailed and held in a predetermined position in the cavity, and in this holding state, the cavity is filled with the shoe sole material to form the shoe sole. A technique has been proposed (see Japanese Utility Model Laid-Open No. 56-163901, hereinafter referred to as "previously proposed technique").

However, the following proposed technique also has the following problems. (1) A screw driving process between the heel core material and the shank and a nailing process between the heel core material and the heel piece are required, which is not a sufficient solution in terms of simplifying the production process. . (2) Since there is a screw in the overlapping portion of the shank and the core material of the heel, at the heel where the maximum load is applied during wearing, the screw will cause a bad foot contact and provide a comfortable wearing feeling. Is impossible. (3) The screw that fixes the heel core material and the shank may come off due to a large bending force or load applied to the sole of the shoe while wearing the shoe. It may tear to the back side.

The present invention has been made in view of the above circumstances and has been made to achieve a dramatic simplification of the production process which cannot be achieved by the previously proposed technique. When manufacturing a shoe that is formed by molding and at the same time the shoe sole is fixed to the covering member, the shank and the heel core can be extremely efficiently embedded in the shoe sole, and the shank can be attached to the molded sole. Of the shoe sole that holds the shoe in a stable manner, is effective for improving the design and exerting the anatomy function, has excellent shape retention of the entire shoe sole, and is excellent in the integrity of the instep and the heel. An object is to provide a material and a molded shoe sole.

[0013]

In order to achieve the above object, the present invention provides (I) a shoe sole member integrally formed with a shank and a heel core (hereinafter, referred to as "first invention"). "
Alternatively, it will be referred to as "the sole member of the first invention"), and (I
I) The design portion formed on the bottom surface portion of the shank of the shoe sole member formed by connecting or integrally molding the shank and the heel core is exposed at a part of the shoe sole grounding surface in the stepless portion or in the vicinity thereof, and
A molded shoe sole characterized in that the heel core of the shoe sole member is embedded inside the heel portion (hereinafter referred to as "second invention" or "molded shoe sole of second invention", and second invention The shoe sole member used in (1) is referred to as "the shoe sole member of the second invention").

The shank and the heel core of the sole member of the first and second inventions may be made of the same material or different materials, and each of the shank and the heel core is made of a plurality of materials. May be. Further, in order to enhance the anchor effect, it is possible to provide the shank or the heel core with a concavo-convex shape or a communication hole that does not hinder the foot contact. The shoe sole member of the first aspect of the invention is such that the shank and the heel core are integrally formed by injection molding, press molding, or the like,
The shoe sole member of the second invention includes not only the integrally molded product of the shank and the heel core, but also those which are connected by a fitting type, an adhesive type, or other mechanical, physical or chemical means.

[0015]

[Operation] First and second integrally formed shank and heel core
In the shoe sole member of the invention, its manufacture is simplified.

In the shoe sole member of the first and second inventions, when the shank and the heel core are made of different materials, the physical properties of the shank (rigidity, elasticity, weight) and the physical properties of the heel core ( Rigidity, weight, etc.) can be combined in various variations. Therefore, by using such a shoe sole member, it is possible to obtain a shoe sole that is excellent in bending recovery and has a high impact absorbing effect, and of course, the entire shoe sole is excellent in shape retention and is also resistant to twisting. A molded shoe sole is provided.

That is, the shoe sole is sufficiently reinforced by one sole member from the heel portion to the instep portion, and the shank and the heel core mutually absorb and support the load. In addition, the heel core and the shank are each singly or embedded in the shoe sole by fixing with a screw as in the previously proposed technology (this is also essentially the action of the shank and the heel core as if they were independent respectively. The same is true), the shape retention of the shoe sole is extremely high, and the resilience to normal vertical bending and twisting bending during wearing is extremely stable. Since the long end of the shank on the heel side is integrally formed with or connected to the heel core, the end does not rupture to the foot contact side. In the case of integral molding, this action and effect are remarkable.

Especially, since it becomes possible to perform molding (at the same time, fixing to a covering member) even on a shoe sole having a large heel step such as high heels, the number of types of molding shoes increases, and eventually the design and practicality. Improvement and reduction of manufacturing cost,
An extremely large effect can be obtained in terms of improving economic efficiency.
In the case where the shoe sole member is embedded in the shoe sole with the shoe sole material interposed between the upper surface of the shoe sole member (shank and heel core) and the shoe sole (book sole) contact surface. Does not cause the shank to be exposed on the side of the foot contact surface, etc.
Even when it is attempted to form the upper surface of the shoe sole (sole) into an undulating surface that fits the sole, the shoe sole member does not hinder the formation of the undulation.

In the molded shoe sole of the second invention, the design portion (this design portion constitutes a part of the shoe sole design) formed on the bottom surface of the shank is formed on the stepped portion molding surface of the bottom mold. It is manufactured by mounting the heel core in the cavity, supporting it by suspending it in the cavity, and performing molding in this state. In this case, since the heel core is not exposed on the foot contact surface of the outsole, it is possible to manufacture a shoe sole with a good foot contact even if a hard member is used as the heel core, and at the same time, to put the shoe sole member in the mold. The setting is extremely easy, and extra work such as attaching a shank or heel core to the insole can be omitted. Further, in this case, since the outsole material such as the injection material and the press material easily flows through the upper and lower parts of the heel core floating in the air, the molding can be smoothly and reliably performed.

Conventionally, in soccer shoes for chasing or kicking a ball, because of the necessity of kicking the ball, the front and rear of the bottom surface of the shank (the front and rear in the longitudinal direction of the shoe sole, hereinafter the same in this prior art). ) A technique has been proposed in which a protrusion is provided in the vicinity of the end, the bottom surface including the protrusion is exposed to the ground contact surface side of the shoe sole, and the shank is fitted into the shoe sole (Actual Publication No. 2-119003). See the book). This prior art shank is manually fitted into a preformed shoe sole, and not only does it not fit into the shank of the first and second inventions, but also the prior art protrusion has a ball. It is, so to speak, a jetty for preventing the shoe sole from warping in the front-rear direction on the ground contact side when kicked, and the role and the sole design of the second invention for supporting the heel core by suspending it in the cavity. The technical idea is different from that of the design portion formed on the bottom portion of the shank that also serves as the.

[0021]

FIG. 1 is a view showing an embodiment of a sole member of the second invention, showing a sole member 1 in which a shank 3 having a flange portion F is fitted and fixed on the front side of a heel core 2. Shows. The shank 3 is made of a material having rigidity and flexibility (such as synthetic resin and metal), and is usually made of a single material, but may be made of a plurality of materials. Further, the shank 3 of the same figure is provided with a large number of communication holes H in order to enhance the anchor effect of the shoe sole member 1 to the shoe sole. Although not shown in FIG. 1, a design portion forming a part of the shoe sole design is formed on the lower surface of the shank 3.

The heel core 2 is made of a material such as cork, wood waste compressed with resin, or ethylene vinyl acetate (EVA). Like the shank 3, the heel core 2 can be made of a single material or a plurality of materials.

In the example of FIG. 1, a cushioning material 6 made of rubber sponge, EVA foam, polyethylene foam, or the like is attached to the foot contact surface side of the heel core 2. The cushion material 6 is not always necessary, but is provided when it is desired to enhance the cushioning effect of the sole of the foot.

The heel core 2 and the shank 3 shown in FIG. 1 may be an integral structure integrally formed by injection molding or pressing with the same material or different materials, or may be joined by adhesion, fitting, or other means (ie, It may be a joined structure made of the same material or different materials that are connected, and the same hereinafter.
If the heel core 2 and the shank 3 are integrally formed of the same material such as a resin material, the component parts as the shoe sole member 1 are further simplified, and as in the present embodiment. In the case of a joint structure made of the same material or different materials joined by adhesion, fitting, or other means,
It is possible to combine strength and elasticity in various variations.

The shoe sole member of the first invention is only an integral structure in which the shank 3 and the heel core 2 are integrally formed by injection molding, pressing or the like in the shoe sole member of the second invention described above.

In the case of a one-piece structure, the materials of the shank 3 and the heel core 2 may be the same single or multiple materials or different single or multiple materials. Needless to say, it needs to be used.

FIG. 2 shows a state in which the shoe sole member of FIG. 1 is used to form the molded shoe sole of the second invention by injection molding, and at the same time, the shoe sole is fixed to the cover 13 to manufacture the molded shoe. FIG. In the same figure, the shoe sole member 1 is embedded in the outsole 4 made of a resin material, and the heel core 2 is arranged substantially in the center of the heel portion 4a of the outsole 4 and the entire sole 4 is formed. The thickness of the outsole 4 is set to be substantially uniform over the entire length,
As a result, it is possible to prevent the occurrence of sink marks or the like during cooling after the heel portion 4a is molded. Here, the outsole 4 is formed, for example, by injection molding of polyvinyl chloride resin (PVC) or the like. By the way, in the structure of the shoe sole 5 according to the present embodiment, since the shank 3 is arranged at an upper and lower intermediate position of the outsole 4, between the shank 3 and the insole 7, the elastic outsole 4 is provided. The material is in the interposition. As a result, the shank 3 does not project to the foot contact surface side, and thus does not have an unnecessary effect as in the conventional adhesive structure. As a result, for example, when the upper surface of the outsole 4 has an uneven surface shape that fits the sole of the foot, the shank 3 does not hinder the foot contact, and the anatomy effect can be sufficiently exerted.

According to the structure of the shoe sole 5 described above, even if the shoe sole is formed by molding with a heel step, it is embedded as the sole member 1 in which the heel core 2 and the shank 3 are integrally connected. Therefore, the sole 4 from the heel portion 4a of the outsole 4 to the stepless portion 8 is reinforced by the sole sole member 1. Further, since the heel core 2 and the shank 3 are in a state of absorbing and supporting the load with each other, unlike the conventional one in which the heel core and the shank are individually buried in the outsole, the entire shoe sole. The shape retention property of is improved, and the rigidity and the bending recovery property at the boundary between the stepless part and the heel part are secured.

Even in the case of the shoe sole member of the first invention, the shoe sole is formed at the same time as the case of the molded shoe sole of the second invention shown in FIG. Needless to say, it is possible to manufacture a molded shoe by fixing it to the above, and when the shoe sole member of the first invention is used, absorption and support of the above-mentioned load is further improved, and the shoe is Needless to say, the guarantee of rigidity and bending recovery at the boundary with the heel becomes even better.

As described above, it is possible to obtain a molded shoe sole having a heel step, which has heretofore been difficult, with excellent strength. In particular, since it is possible to mold even shoe soles with large heel steps, such as high heels, the number of types of molded shoes can be increased, which in turn improves designability and practicality and reduces manufacturing costs, and improves economic efficiency. It is possible to obtain an extremely large effect in achieving the above.

FIG. 3 is a view showing another embodiment of the shoe sole member and the molded shoe sole of the first and second inventions. The shoe sole member 1'shown in FIG. 3 is a high heel shoe sole 5 '. It is shown that the shank 3'according to the line and the heel core 2'embedded in the heel portion 4a 'are integrally configured. In this case, in the first invention, the bottom surface of the shank 3'may or may not be exposed to the ground contact surface of the shoe sole 5 '. Further, the entire shank or heel core may be immersed in the sole, or as long as the sole member is embedded in the sole, a part of the shank or heel core may contact the sole as shown in FIG. It may be exposed on the ground side, or the foot contact surface (that is, the foot contact surface of the outsole), although not shown. In the shoe sole member of the second invention, the design portion formed on the bottom surface portion of the shank is exposed, but as long as the shoe sole member is embedded in the shoe sole, a part of the shank or the heel core of FIG. As described above, the shoe may be exposed on the ground contact surface side or the foot contact surface side.

Next, based on FIG. 2, the shoe sole member 1 of the second invention shown in FIG. 1 (and the shoe sole member of the first invention not shown, this shoe sole member is also referred to as "shoe sole member 1" for convenience. Do)
A method of manufacturing the molded shoe sole 5 using is explained. First, the shoe sole member 1 is attached to the fitting portion 15 formed on the molding surface of the stepless portion 8 of the bottom mold 10. Then, the bottom mold 10, the side mold 12, the cover 13, and the insole 7 are formed.
And the last mold 14 to which is attached are closed, and the bottom material is injected from the injection port 11 into the cavity formed by the molds 10, 12, and 14. As a result, the shoe sole member 1 is fixedly supported while being suspended in the cavity. In this way, by fitting and supporting the design portion 3a of the shank 3 with the fitting portion 15 of the bottom mold 10, the heel core 2 can be made to float in the air in the cavity. No extra work such as attaching a shank or shoe sole to the insole is required. Further, in connection with the shoe sole manufacturing apparatus, according to the shoe sole member 1 of this embodiment, since the heel core 2 and the shank 3 are integrally connected to each other, they are attached to the bottom mold 10. Since the heel core 2 and the shank 3 can be mounted at the same time, the work efficiency can be improved.

In the above embodiment, the shoe sole member 1 in which the shank and the heel core are connected or integrally formed is injection-molded into the shoe sole 5.
Although the case of embedding in the above has been described, this may be performed by press molding. In the case of press molding, a force from above is applied to the shoe sole member, which may cause the shoe sole member to come off the fitting portion of the bottom mold. In such a case, the design part of the bottom surface of the shank should be attached to the fitting part formed on the stepless part molding surface of the bottom mold, and the bottom surface of the heel core should be in contact with the heel part molding surface of the bottom mold. It is also possible to configure the shoe sole member.

[0034]

As described above, according to the first and second inventions, the following effects can be obtained. (1) Since the shoe sole member is formed by connecting or integrally molding the shank and the heel core, and is inserted into the molding die of the shoe sole for die molding, the bending recovery is excellent and the shock absorbing effect is obtained. It is possible to obtain a shoe sole having a high moldability, and also it is possible to realize a mold-formed shoe sole that has excellent shape retention and is resistant to twisting. (2) In particular, it is possible to mold even a shoe sole having a large heel step such as high heels, and it is possible to achieve diversification of the design of the molded shoe. (3) It is extremely easy to set the shoe sole member in the mold,
Extra work such as attaching a shank or heel core to the insole can be omitted. (4) By attaching the design part formed on the bottom part of the shank to the fitting part formed on the stepless part molding surface of the bottom mold, the heel core is suspended in the cavity to be supported in this state. Since the molding can be performed with, the outsole having the heel core in which the heel core is not exposed on the foot contact surface of the outsole can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a shoe sole member of a second invention.

FIG. 2 is an explanatory view showing an embodiment of the molded shoe sole of the second invention.

FIG. 3 is a perspective view showing another embodiment of the molded shoe sole of the first and second inventions.

[Explanation of symbols]

 1,1 'Sole core 2,2' Heel core 3,3 'Shank 3a Design part 4 Outsole 4a, 4a' Heel part 5,5 'Sole 8 Non-step part 10 Bottom mold 12 Side mold 14 Last mold 15 Fitting portion

Claims (2)

[Claims] 1. A shoe sole member comprising a shank and a heel core integrally formed. 2. A design portion formed on a bottom surface portion of a shank of a shoe sole member formed by connecting or integrally molding a shank and a heel core to a part of the shoe sole grounding surface at or near the stepped portion is exposed. In addition, the molded shoe sole, wherein the heel core of the sole member is embedded inside the heel portion.