JPH0810005A - Core material for shoes - Google Patents

Abstract

PURPOSE:To produce a core material for shoes which is formed by a so-called direct soling for molding a shoe bottom by injection or filling and integrating it with a vamp part, and suitably used for heel stepped shoes. CONSTITUTION:A core material 1 for shoes consisting of a shank part 2 and a heel core part 3 which are integrated together and an upper surface form according to a middle bottom upper surface form is buried in an injected or filled shoes bottom material, and integrated with shoes. The shank part 2 and the heel core part 3 have holes 5, 6, 6' for passing the shoes bottom material. The diameter 51 opened on the middle bottom lower surface side of at least the hole 5 of the shank part is set larger than the diameter 52 opened on the other side, the heel core part 3 has a hollow part 4, and the heel core part 3 is constituted into a two-stage thickness structure so that the rear end part is thicker than the front end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core material for shoes by so-called direct sawing, in which a shoe sole is molded by an injection method or an injection method to be integrated with a covered portion, and in particular, it is molded by these techniques. The present invention relates to a shoe core material suitably used for a shoe with a heel step.

[0002]

2. Description of the Related Art Generally, in the case of a shoe having a heel step, a load (for example, a load during normal running / walking or a shock) is applied to a heel portion (heel portion) when the shoe is worn. Load, etc.) acts, and the depression force and bending force due to the same load act on the non-stepped portion. Therefore, the heel portion is required to have a high-strength structure capable of withstanding the above-mentioned load, while the non-step portion needs to be provided with measures for preventing a fall and to be provided with a restoring property against bending. The part where the tread part and the heel part are continuously integrated is required to have shape retention in order to maintain a comfortable wearing feeling.

Usually, in hand-sewn shoes such as leather shoes, the heel portion is made of a high-strength material such as hard leather or hard plastic, and the non-step portion is made of steel, bamboo, wood, plastic, inorganic or organic material. The above requirements are met by mounting a shank made of a material having both rigidity and toughness such as fibers.

However, if the above-mentioned technique for the heel portion is applied to the shoe by direct sawing, it is necessary to change the injection or injection material between the heel portion and the other portion, and the structure of the mold is only complicated. In other words, the heel portion and the other portion do not peel off during wearing, and it is necessary to carefully select a material that maintains the integral structure of these portions, and the effect of direct sawing called cost reduction is lost. In addition, the injection or injection material fills the entire heel portion, which also increases the weight of the shoe.

As a solution to these problems, it is possible to use a heel core, but the heel core floats up during injection or injection, good injection or injection cannot be performed, and shoes with a heel step that can withstand practical use. It is hard to be.

Further, when the above method of the shank portion is applied to shoes by direct sawing, a shank attaching step is required, and not only the effect of direct sawing that cost reduction is also lost, There is a high possibility that the shoe will be detached from the shoe sole during wearing, which impairs the feeling of wearing and also reduces the durability or quality of the shoe.

For this reason, conventionally, shoes having direct heeling have generally not had a heel step.

However, due to the recent diversification of lifestyles and the increase of luxury tastes, the demand for diversification of design has rapidly increased, and even shoes made by direct sawing have a heel step and are lightweight and low cost. In addition, it is an urgent task to develop a product with excellent durability without peeling of the heel core or shank.

Therefore, the applicant of the present invention also previously
(A) Shoe sole with shank material integrated with sole material (Japanese Patent Application No. 3
No. 277168), (b) Sole with integrated shank and heel core (see Japanese Patent Application No. 3-95032), (c) Limited physical properties (flexural modulus, rigidity, restoration). (Sole) using a shank material that has strength (Japanese Patent Laid-Open No. 63-
No. 189101), etc. have been proposed.

The above technique (a) is not limited to the existing concept of attaching the conventional shank from the foot contact side of the shoe sole, and the shank is attached from the ground contact side and is integrated with the sole material to be injected or injected. It is to be embedded in the shoe, and prevents the shank from separating from the sole material.

Further, the technique (b) above breaks down the existing concept of using the shank and the heel core as separate shoe sole parts, and the functions of each of them are maintained as they are and integrated into one. It is a shoe sole component that not only prevents the heel core from rising when injecting or injecting and disengaging the shank during wearing, but it is also an epoch-making product that does not require the shank attachment process. It is a thing.

Further, the technique (c) is to provide a shank having physical properties adapted to a peculiar depressed state and bending force different from the conventional leather shoes or the like added to the stepped portion of the injection type shoe, It is the basis of the present invention described in the above (a) and (b) or described later.

In order to meet the above-mentioned urgent need, the present invention provides a shoe core material suitably used for shoes with a heel step by direct sawing, and is based on the above technique (b). An object of the present invention is to provide a shoe core material having one practical form in terms of how to wear it, how to attach other shoe sole members, and the like.

[0014]

In order to achieve the above object, a shoe core material of the present invention is a shoe core having a shank and a heel core integrated with each other and having an upper surface shape conforming to an upper surface shape of a midsole. Material, which is embedded in the injected or injected sole material to be integrated with the shoe. At this time, preferably, (1) the shank portion and the heel core portion have a hole for allowing the sole material to pass therethrough, and at least the diameter of the hole of the shank portion that is open to the underside of the inner sole is smaller than the diameter that is open to the other side. big,
(2) The heel core portion has a hollow portion, and (3) the heel core portion has at least two stages of thickness so that the rear end portion is thicker than the front end portion.

In the present invention, the shank portion and the heel core portion may be made of the same material or different materials. In the latter case, the shank portion itself or the heel core portion itself can be formed by combining different materials.

For example, in the case where the heel core portion has a hollow portion, the heel core portion is constructed by a combination of a lid portion and a box portion, and the lid portion and the box portion are made of different materials. The above-mentioned heel core part can be formed by combining the above. In this case, a part of the front surface (non-stepping portion side) of the box portion extends and the extended portion serves as a shank portion (that is, the box portion and the shank portion that are the main body of the heel core portion). (Integral molding made of the same material as
It can also be. Alternatively, the shank portion and the lid portion of the heel core portion may be integrally formed, and the lid portion may be combined with the box portion of the heel core portion.

As described above, the shoe core material of the present invention is integrally molded in at least a part of the shank portion and the heel core portion. The molding method is not particularly limited, and injection molding, It is possible to apply ordinary molding methods such as cast molding and press molding that can form an integrally molded product.

As described above, as the same or different material, the heel core portion needs to be made of a high-strength material, and the shank portion needs to be made of a material having both rigidity and toughness. In addition, in consideration of the fact that the shank portion and the heel core portion can be integrally molded in at least a part of each of these portions, and that good adhesion to the injection or injection material is important, a material satisfying all of them is required. May be appropriately selected and used from, for example, the shank material disclosed in the publication (c) of the prior proposal by the present applicant.

[0019]

The core material for shoes according to the present invention, in which the shank portion and the heel core portion are integrated, and the shape of the upper surface matches the shape of the lower surface of the insole,
In general, before fitting the upper (in the present invention, a cover, sock-like back cloth, etc.) to the last mold, on the lower surface of the insole attached to the upper by sewing,
After all, it is attached by sewing and used. Of course, after fitting the upper and the insole integrally sewn into the last mold, the shoe core material of the present invention is attached to the lower surface of the insole by an adhesive, a snap, or other appropriate means. It can also be attached.

In such a state, the side mold and the bottom mold are set, and injection or injection is carried out. Therefore, the situation that the shoe core material of the present invention floats due to the injection or injection material does not occur. .

As described above, the shoe core material of the present invention has an upper surface shape that matches the shape of the lower surface of the insole. Therefore, for example, it is said that the upper surface of the insole matches the shape of a person's sole. In the case of a loose anatomy structure, if the anatomy structure is extended to the bottom surface of the insole, the top surface shape of the shoe core material of the present invention is
This conforms to the shape of the bottom surface of the insole of the anatomy structure, so that the anatomy structure, which has hitherto been generally impossible for a shoe with a heel step using a shank, can be easily applied.

Further, in the shoe core material of the present invention, as described above, not only the shank portion and the heel core portion are integrated and the shape of the upper surface matches the shape of the lower surface of the insole, but also injection or injection. Since it is embedded in the shoe sole material and integrated with the shoe, the shoe core material moves and peels from the shoe body (insoles, outsole, etc.) while wearing the shoe using the shoe core material. It does not cause detachment.

At this time, if the shank portion and the heel core are provided with holes for allowing the sole material to pass therethrough, the injected or injected sole material passes through the holes and the shoe of the present invention. It also flows into the upper side (lower surface side of the insole) of the core material to integrate the upper side and the lower side. Moreover, since the diameter of the hole that opens on the lower surface side of the insole is larger than the diameter that opens on the other side, a large amount of injection or injection material will flow into the lower surface side of the insole. The adhesive force between the core material and the injection or injection material is greater.

By providing the appropriate number (plurality) of the above-mentioned holes at appropriate locations of the shank portion and the heel core portion, a good anchoring effect is obtained over the entire shoe core material of the present invention. be able to.

By using the shoe core material of the present invention, the weight of the shoe can be reduced because the injection or injection material is not filled in the entire heel portion (heel portion). At this time, since the heel core part has a structure having a hollow part, the weight of the heel core part itself is also reduced,
It contributes to the weight reduction of shoes.

By the way, in order to prevent slipping of shoes in a heavy snowfall region, a cold region, etc., a slipper (for example, a practical application by the applicant of the present application, Sho-58-49) is generally attached to the bottom of the heel.
It may be equipped with a structure already proposed in No. 910). In this case, conventionally, after the shoe sole is formed by direct sawing or the like, a hole for penetrating the heel ground contact surface and the upper surface of the insole at the position where the anti-slip equipment is installed is formed, and the anti-slip equipment is fixed by passing a rivet through the through hole. Was. Therefore,
Snowmelt water etc. may get inside the shoe through this through hole,
Alternatively, the screw for fixing the rivet is exposed on the upper surface of the insole, and the feeling of wearing is impaired.

As a countermeasure against these problems, the present applicant has already proposed various techniques (for example, Japanese Patent Laid-Open No. 60-188).
No. 102, No. 60-193104, No. 60-
No. 259202).

According to the shoe core material of the present invention, it is possible to prevent water leakage and screw exposure due to the above-described anti-slip equipment by an action different from those of the previously proposed techniques.

That is, in the shoe core material of the present invention, before attaching the core material to the lower surface of the insole as described above, a hole for allowing the shoe sole material provided in the heel core portion of the core material to pass therethrough. A rivet is inserted into and the screw for fastening the rivet is exposed on the upper surface of the heel core. The shoe core material of the present invention thus configured,
As described above, the shoe is attached to the lower surface of the insole, fitted into the last mold, the side mold and the bottom mold are set, and the shoe sole material is injected or injected.

As a result, a shoe in which the rivets for the anti-skid equipment are attached to the heel portion is formed. At this time, if the upper surface of the bottom mold is grooved so that the tip portion of the rivet fits, the tip portion of the rivet is exposed on the bottom surface of the heel portion of the formed shoe. If a bottom mold not subjected to such groove cutting is used, only the opening of the rivet will be exposed. Therefore, the anti-skid device is attached by these exposed portions. Even if the opening is not exposed, the sole material formed by injection or injection is a soft material,
Installation of anti-slip is extremely easy.

As described above, the rivet is firmly fixed to the shoe core material of the present invention by the injection or injection material that has entered the rivet insertion hole, and the insertion hole fills the injection or injection hole. The material eliminates water leakage (the rivet is fixed and the water leakage is prevented by the so-called packing action of the injection or injection material). In addition, the rivet fastening screw is not exposed on the upper surface of the insole while being filled with the injection or injection material.

Therefore, according to the shoe core material of the present invention,
It is possible to solve the problem existing in the conventional shoes equipped with the anti-skid device by the action different from the above-mentioned technique proposed by the present applicant.

At this time, at least the rear end of the heel core is thicker than the front end (thicker in the height direction of the heel, in other words, higher in the height direction of the heel). With the two-stage thick structure, the following effects can be obtained.

That is, at least two rivet insertion holes can be formed in the thick (high) portion of the rear end and the thin (low) portion of the front end. Then, the thinner (lower) portion of the front end portion is filled with a larger amount of injection or injection material than the thicker (higher) portion of the rear end portion. Therefore, the rivet inserted into the hole drilled in the thin (low) portion of the front end has a thick (high) rear end.
A stronger packing action is applied than the rivet inserted in the hole formed in the portion, and the rivet is more firmly fixed.

The front end portion is thinned (in other words,
The reason for strengthening the packing action of the front end) is that the force applied to the anti-skid during running / walking is much larger at the front end than at the rear end, and therefore opposes this force.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing a shoe core material according to an embodiment of the present invention with a part cut away and a heel core portion disassembled into two parts. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view taken along line AA ′ of FIG.

1 to 3, reference numeral 1 denotes a shoe core material main body of the present invention, and in this example, the heel core portion 3 has a combined structure of a box portion 31 and a lid portion 32. The void portion inside the portion 31 is the hollow portion 4 of the heel core portion. In this example, the shank portion 2 and the box portion 31 and the lid portion 32, which are the constituent members of the heel core portion 3, are all formed of the same material as an integrally molded product.

A plurality of holes 5 (nine in this example) and holes 6 (two in this example) are formed in the shank portion 2 and the heel core portion 3, and the holes 5 of the shank portion 2 are formed. Has a diameter 51 that opens on the lower surface side of the insole (that is, the upper surface side of the shoe core material 1) that is larger than a diameter 52 that opens on the lower surface side of the shoe core material 1.

The box portion 31 forming the heel core is
In this example, the rear end portion is thicker (higher) than the front end portion, so that the rear end portion has a two-step thick structure as illustrated. On the other hand, the lid 32 has a recess 321 in the center and has a hole 6 ′ that matches the hole 6 described above. Then, the box portion 31 and the lid portion 32 are provided with appropriate combining means (for example, holes 6 << 6 '>> and 6 provided on each of these members.
<6 '>, in other words, a female protrusion and a male protrusion (not shown) provided in the substantially central portion of the box portion 31 are combined and fixed to form a heel core portion.

Thus, the upper surface of the shoe core material 1 of the present invention in which the box portion 31 and the lid portion 32 are combined (in this example, the upper surface of the shank portion 2 and the heel core portion 3 are constituted). Box part 31
The shape of the upper surface of the periphery and the upper surface of the periphery of the lid portion 32) match the shape of the lower surface of the insole 13 (see FIG. 4). Therefore, if the upper surface of the insole 13 has an anatomy structure and extends to the lower surface of the insole 13, the upper surface shape of the shoe core material 1 of the present invention also has an anatomy structure. Become.

With respect to the usage of the shoe core material 1 of the present invention having the above-described structure when applied to shoes equipped with anti-skid equipment, a part of the product using the shoe core material of the present invention will be described. The following is also described with reference to FIG. 4, which is shown. First, two rivets 10 and 10 'for fixing the slipper are inserted into the holes 6, 6, 6'and 6'of the heel core 3, respectively. At this time, the rivet fixing screws 11, 11 ′ are exposed on the upper surface of the lid portion 32, but are housed in the recess 321 provided in the lid portion 32 and project upward from the lid portion 32. There is no such thing.

The shoe core material 1 of the present invention, to which the rivets 10 and 10 'are thus fixed, is sewn or bonded to the insole 13 sewn to the upper (cover in this example) 12. Attach with an agent. This is fitted into a last mold (not shown), and a side mold and a bottom mold (not shown) are also used (in this example, a bottom mold which is not grooved so that the tips of the rivets 10 and 10 'are fitted is used. ) And inject or inject the sole material 14 (in this example,
Injection).

At the time of this injection, the situation in which the shoe core material 1 of the present invention, which is attached to the insole 13 by sewing, adhesive or the like, is lifted by the injection material 14 does not occur.
Therefore, an injection-molded shoe in a good condition as shown in FIG. 4 can be easily obtained.

The heel part (heel part) of the injection-molded shoe shown in FIG.
The openings of the rivets 10 and 10 'are exposed on the bottom surface, and the openings are set to positions for mounting the antiskid device 15, and the antiskid device 15 is fixed by the rivets 10 and 10', as shown in FIG. The product is completed.

In the product shown in FIG. 4, in the heel core portion 3 of the shoe core material 1 of the present invention, the front end portion (the portion on the shank portion 2 side) is thinner than the rear end portion (heel height). Since the height in the depth direction is low), the sole material 1 is attached to the front end α.
4 is filled in a large amount, and the rear end portion β is filled with a smaller amount of the sole material 14. Therefore, the rivet 10 inserted into the holes 6 and 6'on the front end side has a larger amount of sole material than the rivet 10 'inserted into the holes 6 and 6'on the rear end side. A large packing force is applied, and the rivet 10 is more firmly fixed to the sole material 14 and the shoe core material 1 than the rivet 10 '.
As a result, when running / walking on a frozen road surface, the rivet 10 does not extend and the tightening of the anti-skid device 15 does not loosen due to the force strongly applied to the front side of the anti-slip device 15.

In the product shown in FIG. 4, since the rivets 10 and 10 'are fixed to the shoe core material 1 before the shoe sole material 14 is injected, the packing force of the injected shoe sole material 14 is increased. Are added to the rivets 10 and 10 ', and snowmelt water and the like do not leak from the periphery of the rivets 10 and 10' into the inside of the shoe sole.

Moreover, the fastening screws 11, 11 ′ of these rivets 10, 10 ′ are the recesses 3 of the lid 32 of the heel core 3.
Since it is housed in the shoe 21 and embedded in the shoe sole material 14, there is no leakage of snowmelt water or the like into the inside of the shoe from around the screws 11 and 11 ', and the screws 11 and 11' are worn. There is no contact with the sole of the user's foot.

Further, the product shown in FIG.
The shoe core material of the present invention in which the upper core shape and the heel core part 3 are integrated, the upper surface shape matches the shape of the lower surface of the insole 13, and holes 5, 6, 6'for passing the sole material 14 are formed. Since 1 is embedded in the sole material 14 and integrated with the shoe, the shoe core material 1 may move, peel off, detach from the insole 13 or the sole 14 during wearing. There is no.

In addition, the product shown in FIG. 4 has a structure in which the filling amount of the sole material 14 is reduced by the capacity of the shoe core material 1 of the present invention, and in addition, the heel core portion 3 has a hollow portion 4. Therefore, the weight of the shoes can be significantly reduced.

As described above, the product shown in FIG. 4 has excellent wearability.

[0051]

As described above in detail, according to the shoe core material of the present invention, the following effects can be obtained.

(1) The shoe core material of the present invention has an upper surface shape that matches the lower surface shape of the insole and is embedded in the injected or injected shoe sole material to be integrated with the shoe. It can be fixedly held in close contact with the insole and the shoe sole, and the core material does not move, peel, or come off.

(2) When a hole for allowing the shoe sole material to pass through is provided, the anchoring effect of the shoe sole material filled in the hole can be obtained, and the shoe core material and the shoe sole material of the present invention can still be obtained. More powerful fixed holding is possible.

(3) When a hollow portion is provided in the heel core portion, the weight reduction due to the hollow portion is added to the weight reduction due to the use of the shoe core material of the present invention, so that the weight reduction can be further realized.

(4) In the case where the heel portion is equipped with a slip preventer, the problem of water leakage from the insertion hole of the conventional rivet for fixing the slip preventer is eliminated, and the conventional rivet stopping screw has a bad foot contact. Can also be eliminated. Moreover, the conventional rivet insertion hole drilling process is eliminated,
Productivity is also greatly improved. At this time, the thickness of the heel core is set to be thin in the front part and thick in the rear part so that the thickness of the heel part is at least two steps. it can.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining an example of a shoe core material of the present invention.

2 is a plan view of the shoe core material shown in FIG. 1. FIG.

FIG. 3 is a sectional view taken along the line AA ′ of FIG.

FIG. 4 is a partial cross-sectional view for explaining an example of a shoe product using the shoe core material of the present invention.

DESCRIPTION OF SYMBOLS 1 Shoe core material 2 Shank part 3 Heel core part 31 Box part forming the heel core part 32 Lid part forming the heel core part 321 Recessed part provided in the lid part 4 Heel core Hollow part 5, 6, 6'Hole 51 through which shoe sole material passes 51 Opening on the bottom side of the insole 52 of hole 5 Opening on the opposite side of 51 (hole 5) Rivet 11,11 'Rivet fastening rib 12 Cover 13 13 Insole 14 Sole material 15 Anti-slip

Claims (4)

[Claims] 1. A shoe core material having a shank and a heel core integrated with each other and having a top surface shape matching the top surface shape of the insole, the core material being embedded in an injected or injected sole material and integrated with the shoe. The core material for shoes, which is characterized by 2. The shank portion and the heel core portion each have a hole for allowing a shoe sole material to pass therethrough, and at least the diameter of the hole of the shank portion which is open to the underside of the insole is larger than the diameter which is opened to the other side. The core material for shoes according to claim 1, which is characterized in that. 3. The core material for shoes according to claim 1, wherein the heel core portion has a hollow portion. 4. The core material for shoes according to claim 1, wherein the heel core portion has a structure having at least two steps thicker so that the rear end portion is thicker than the front end portion.