JP3217024B2 - Method for manufacturing injection molded shoes and injection molded shoes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an injection-molded shoe having a core member for absorbing shock and reducing weight at a predetermined portion of a shoe sole, and an injection-molded shoe manufactured by the method.

[0002]

2. Description of the Related Art Conventionally, in forming a sole, it is difficult to provide a sole sole material with all functions required for the sole such as durability, shock absorption, light weight, and appearance. 2. Description of the Related Art There is known a technique in which a core member such as an impact absorbing material or a lightening material is provided only in a particularly necessary part of a shoe sole. At this time, in the case of the injection-molded shoe, after the core member is positioned at a predetermined position in the space for molding the sole of the mold, the sole material is injected and injected into the cavity to perform insert molding, and the core member is formed of the material for the sole of the shoe. Techniques for embedding inside are generally widely used.

[0003]

However, when the core member is embedded inside the sole material as in the above-mentioned injection molded shoe,
For example, in the case where the purpose of the core member is a shock absorbing material that absorbs the impact of the heel portion, the position of the core member is separated from the peripheral edge of the heel portion of the sole that first contacts the ground when walking, and the peripheral edge of the heel portion The impact absorption effect near the part tends to be inferior, and there is a drawback in the impact absorption effect in the important places where the impact absorption is most required. In addition, since the core member is embedded in the inside of the shoe sole and cannot be exposed to the outside, the appearance quality tends to be inferior to that of a handmade shoe that can expose the core member to the outside. There was also.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and when manufacturing a shoe sole using a core member by injection molding, it is possible to effectively absorb a landing impact particularly when walking, An object of the present invention is to provide an injection-molded shoe capable of providing a visual effect not inferior to a shoe manufactured by a manufacturing method.

[0005]

In order to achieve the above object, according to the present invention, in the first aspect, a void for an outsole is defined by a bottom mold and a dummy bottom mold, and an injection material is formed in the void for an outsole. After molding the outsole, the dummy bottom mold is removed while the outsole is held by the bottom mold, and then the bottom mold is fitted with a last mold and a recess for forming a recess. A side mold having a protruding piece is formed by molding to define a midsole cavity, an injection material is injected into the midsole cavity, and at least a part of a peripheral side surface is depressed into a concave shape. Is formed to form an intermediate product in which the shell, the midsole and the outsole are integrated. Then, after removing the intermediate product from each mold, a core member having substantially the same shape is fitted and fixed in the concave portion of the midsole of the intermediate product, so that an injection molded shoe as in claim 4 is manufactured. did.

When the midsole is formed by injection subsequent to the outsole, a recess (unfilled portion) is formed in at least a part of the peripheral side surface of the midsole, and a core of substantially the same shape is formed in the recess. If the members are fitted and fixed by bonding and the like, a part of the sole of the shoe can be integrated with the core member of the injection molded shoe having a three-layer structure in a state of being exposed to the outside from the peripheral side surface of the midsole, For example, it is possible to exert the effect of absorbing shock up to the peripheral edge of the sole of the shoe and to reduce the weight. Further, since the core member is exposed to the outside, it is possible to obtain an appearance not inferior to that of a handmade shoe.

[0007] In the second and fifth aspects, a concave portion in which a part of the peripheral side surface of the midsole is depressed in a concave shape is formed in the heel portion. Such a heel portion is a portion where a ground impact is applied first at the time of walking, and if applied to such a portion, it is effective in reducing the impact.

In the third and sixth aspects, the heel-side rear portion of the outsole extends rearward beyond the heel portion in a tongue shape,
After the core member was fitted and fixed in the concave portion of the heel portion, the tongue-shaped rear end was raised and fixed so as to enclose the core member. Here, since the outsole is generally made of a material having excellent wear resistance, if the outsole is raised to the tongue and fixed so as to enclose the core member, the core member exposed to the outside is prevented from being damaged. And so on.

A method for manufacturing such an injection-molded shoe is as follows.
The midsole and the outsole are laminated, and the core member is laminated not only on the sole of the midsole but also on a part of the sole sole, as well as on the sole of the sole having a three-layer structure. 2
The present invention can also be applied to a case of a layered structure.
If the injection-molded shoes according to the tenth to twelfth aspects are manufactured by the manufacturing method according to the sixth to sixth aspects, the same operation and effect as in the above example can be obtained.

[0010]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is an external view showing an example of an injection molded shoe of a first configuration example according to the present invention, FIG. 2 is a rear view thereof, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. FIG. 5 is a state diagram of the combination of the molds when molding the outsole in the case of the example, FIG. 5 is a state diagram of the combination of the molds when molding the midsole in the case of the first configuration example, FIG. 6 is a plan view of FIG. 8 is an external view of the intermediate product in the case of the first configuration example.

As shown in FIGS. 1 to 3, a first embodiment of an injection-molded shoe 1 according to the present invention comprises a shell 2 and an insole 3.
The sole 4 is characterized in that the sole 4 is formed by injection-molding an outsole 5 and a midsole 6 and a part between the outsole 5 and the midsole 6. A core member 7 to be inserted and bonded is provided. The core member 7 is formed of a lightweight material having a high shock absorbing property and is mounted on a heel portion in the embodiment. When mounting the midsole 6 by injection molding, the heel portion is formed with a recessed portion not filled with the injection material, and after the injection molding is completed, the core member 7 is fitted into the recessed portion and bonded. I have.

The core member 7 is mounted so as to be exposed to the outside from the peripheral side surface of the midsole 6, so that the shock absorbing effect extends to the peripheral edge of the heel portion which first comes into contact with the ground when walking. Then, the rear end of the outsole 5 is extended in a tongue shape, and the tongue-shaped extension portion 5j is raised so as to wrap a part of the rear surface of the core member 7 as shown in FIG. To the midsole 6. With such a configuration, a visual effect comparable to a handmade shoe sole in appearance can be obtained.

A method for manufacturing such an injection molded shoe 1 will be described. As shown in FIG. 4, while a last mold 11 in which an insole 3 and a cover 2 integral with the insole 3 are suspended and a pair of side molds 12 are put in a mold assembly state,
The bottom mold 13 and the dummy bottom mold 14 thereabove are combined to define an outsole void C1, and the primary injection gate 1 is inserted into the outsole void C1.
The outsole molding material is injected from 3 g to form the outsole 5. At this time, the rear end of the outsole 5 is a tongue-shaped extending portion 5j extending further rearward than the position of the heel.

Next, the dummy bottom mold 14 is detached, and the bottom mold 13 holding the outsole 5 is removed.
Is brought into contact with the lower surface of the side mold 12 in the assembled state, and as shown in FIG. 5, the midsole void portion C2 is defined by the last mold 11, the side mold 12, and the bottom mold 13.

Here, the side mold 12 is provided with a projection 12t for forming a concave portion projecting from the heel side into the midsole cavity C2 at a predetermined length, and the projection 12t is provided by the projection 12t. In addition, a part of the space on the lower surface side of the heel portion of the midsole cavity C2 is closed to prevent the injection material from entering, and as shown in FIG. The upper surface of the mold 13 or the outsole 4 is configured to abut.

As shown in FIG. 6, a concave groove m for forming a secondary injection gate 12g is formed in a predetermined portion of the mating surface of the left and right side molds 12, as shown in FIG. As shown in FIGS. 6 and 7, a groove n connecting the groove m and the gap C2 for the midsole is engraved at a predetermined position on the lower surface of the side mold 12. The molding material injected from the secondary injection gate 12g when the mold 12 is matched can be guided to the midsole cavity C2.

When the midsole molding material is injected into such a midsole cavity C2 to form the midsole 6, the midsole 6 is integrated with the shell 2 and the insole 3, and However, the part from the toe side to the vicinity of the step is not laminated and integrated.

Then, when the molds 11, 12, and 13 are separated, an intermediate product 15 having a concave portion D formed in the heel portion of the midsole 6 as shown in FIG. 8 is taken out. The recess D is open to the heel of the peripheral side surface of the midsole 6.

With respect to such an intermediate product 15, a concave portion D
A core member 7 having substantially the same shape as that described above is fitted and fixed by bonding or the like. When the core member 7 is fixed, the tongue-shaped extending portion 5j of the outsole 5 is raised so as to wrap the core member 7, and is fixed to the core member 7 and the midsole 6 by bonding or the like. The manufacture of the injection molded shoe 1 as shown in FIG. 3 is completed. Incidentally, as the material of the core member 7, a lightweight and highly shock-absorbing material such as a cork material and a foamed resin material can be used. In addition, an EVA material, a PU part material, a PVC part material, a recycled material Or other materials may be used.

Injection molded shoes 1 manufactured by the above method
Since the core member 7 faces the peripheral edge of the heel, it is possible to effectively reduce the impact of a portion that first comes into contact with the ground when walking, and in comparison with embedding the core member inside the shoe sole,
Since it can be used in a wide area, it is possible to further reduce the weight. Further, since the core member 7 is exposed to the outside, it is easy to change, for example, a color, a surface pattern, and the like, and a visual effect such as a handmade feeling can be obtained.

The tongue-like extension 5 of the outsole 5
If j is raised and fixed, the core member 7 can be protected and the design can be improved.

Next, a second example of the construction of the injection molded shoe according to the present invention will be described with reference to FIGS. Here, FIG.
FIG. 10 is an external view showing an example of an injection molded shoe of the second configuration example, and FIG.
FIG. 9 is a diagram showing a combination of molds at the time of outsole molding in the case of the second configuration example, and the same members and the like as those in the above-described example are given the same numbers.

As shown in FIG. 9, the sole 4 of the injection molded shoe 1A has a core member 7 attached to the heel of the outsole 8,
As in the case of the formation of the midsole 6 in the above example, the core member 7 has a concave portion formed in the heel portion when the outsole 8 is formed, and the core member 7 is fitted into the concave portion and bonded.

That is, as shown in FIG. 10, a last mold 11 in which a shell 2 integral with the insole 3 is suspended.
And a pair of side molds 12 provided with protruding pieces 12t for forming recesses and a bottom mold 13 to form an outsole cavity C3. Is formed, the protruding piece t is not filled with the material, and a recess is formed.

When the intermediate product in which the shell 2 and the outsole 6 are integrated is taken out, a core member 7 of the same shape is fitted into the recessed portion of the outsole 8 and bonded, as shown in FIG. Injection molding shoes 1A are manufactured.

In FIG. 10, a tongue-shaped extension is not provided below the concave portion of the outsole 8, but a heel portion is provided below the concave portion, as in the first configuration example. A tongue-like extending portion extending rearward beyond the tongue portion may be formed, and the tongue portion may be raised so as to wrap a part of the rear surface of the core member 7 and fixed to the outsole 8. . In this case, the core member 7 is protected as in the above-described example, and the design can be improved.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the core member 7 may be provided at a position other than the heel portion, or may be provided at a plurality of positions.

[0028]

As described above, according to the present invention, when the midsole is formed by injection following the outsole, a concave portion is formed on at least a part of the peripheral side surface of the midsole. And a core member having substantially the same shape is fitted and fixed in the recessed portion, so that the core member of the injection-molded shoe having a part of the sole of the shoe having a three-layer structure is provided from the peripheral side surface of the midsole to the outside. It can be integrated in the exposed state, for example, to exert the effect of shock absorption up to the edge of the sole of the shoe,
The weight can be reduced. In addition, a visual effect similar to a handmade shoe can be obtained.

Further, if the recessed portion is formed in the heel portion as in claims 2 and 5, it is effective to reduce the impact during walking. If the tongue-like extending portion extending to the heel side rear portion of the outsole is raised and fixed so as to enclose the core member, the core member is exposed to the outside. Can be protected. In addition, such a method for manufacturing an injection-molded shoe includes a method of laminating a core member on a part of a single-layer outsole,
The present invention can also be applied to a case of a layered structure.
The same effect can be obtained by manufacturing the injection-molded shoes according to the tenth to twelfth aspects by the manufacturing method according to the sixth to sixth aspects.

[Brief description of the drawings]

FIG. 1 is an external view of an injection-molded shoe of a first configuration example according to the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a view showing a combination of molds at the time of outsole molding of the first configuration example.

FIG. 5 is a combined state diagram of a mold at the time of molding the midsole of the first configuration example.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a sectional view taken along line BB of FIG. 5;

FIG. 8 is an external view of an intermediate product of the first configuration example.

FIG. 9 is an external view of an injection-molded shoe of a second configuration example according to the present invention.

FIG. 10 is a combined state diagram of a mold at the time of outsole molding of the second configuration example

[Description of Signs] 1, 1A: Injection molded shoes, 2: Cap, 4: Sole, 5: Outsole, 5j: Tongue-shaped extension, 6: Midsole, 7
... core member, 8 ... outsole, 11 ... last mold, 12 ... side mold, 12t ... protruding piece, 13 ... bottom mold,
14: dummy bottom mold, 15: intermediate product, C1: void for outsole, C2: void for midsole, C3
... Void portion for outsole, D ... Recessed portion.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29D 31/50 A43B 13/12 A43B 13/14 A43B 13/18 A43B 13/40

Claims (12)

(57) [Claims] 1. A step of defining an outsole cavity by a bottom mold and a dummy bottom mold, injecting an injection material into the outsole cavity to form an outsole, and attaching the outsole to the bottom mold. The dummy bottom mold is removed in a state where the mold is held, and then, the bottom mold is assembled with a last mold fitted with a cover and a side mold having a projection for forming a recessed portion to form a midsole void portion. Defining a step, injecting an injection material into the midsole cavity, molding a midsole having a concave portion in which at least a part of the peripheral side surface is depressed into a concave shape, and forming a shell, a midsole, and an outsole. Forming an integrated product, and removing the intermediate product from each of the molds, and forming substantially the same shape in the concave portion of the midsole of the intermediate product. A method of manufacturing an injection-molded shoe, comprising a step of fitting and fixing a core member of (1). 2. The method of manufacturing an injection molded shoe according to claim 1, wherein a recessed portion in which a part of a peripheral side surface of the midsole is recessed is formed in a heel portion. Manufacturing method of molded shoes. 3. The method of manufacturing an injection-molded shoe according to claim 2, wherein a rear portion of the outsole on the heel side extends rearward beyond the heel portion in a tongue shape, and the core member is connected to the heel portion. And inserting and fixing the tongue-shaped rear end portion so as to enclose the core member, and then fix it so as to enclose the core member. 4. A step of forming a bottom sole cavity by assembling a last mold fitted with a cap and a side mold and a bottom mold having a projection for forming a recess, and the bottom sole gap. Injecting an injection material into the part, forming an outsole having a concave portion in which at least a part of the peripheral side surface is depressed into a concave shape, and forming an intermediate product in which the cover and the outsole are integrated, A method for manufacturing an injection-molded shoe, comprising: after removing an intermediate product from each mold, a step of fitting and fixing a core member having substantially the same shape into a concave portion of an outsole of the intermediate product. 5. The method of manufacturing an injection-molded shoe according to claim 4, wherein the recessed portion in which a part of the peripheral side surface of the outsole is recessed is formed in the heel. Manufacturing method of molded shoes. 6. The method of manufacturing an injection-molded shoe according to claim 5, wherein a lower portion of the recessed portion of the outsole extends in a tongue shape rearward beyond a heel portion, and the core member is provided. A method of manufacturing an injection-molded shoe, comprising: inserting a bottom portion of a tongue into a concave portion of a heel portion; and fixing the rear end portion of the tongue piece so as to enclose a core member. 7. An injection-molded shoe comprising a sole and an outsole and a midsole laminated and integrated by injection molding, at least a part of which is formed into a three-layer structure by a core member, wherein the core member is The midsole is fitted and fixed in a recess formed in the midsole, and the recess of the midsole is opened to the peripheral side surface by a projection for forming a recess of a side mold during injection molding of the midsole. An injection-molded shoe characterized by being formed by: 8. The injection molded shoe according to claim 7, wherein
The said core member is arrange | positioned at a heel part, The injection molded shoe characterized by the above-mentioned. 9. The injection molded shoe according to claim 8, wherein
The rear part of the heel portion of the outsole extends rearward beyond the heel portion in a tongue shape, and the rear end portion of the tongue shape is raised to envelop the core member of the heel portion and An injection molded shoe fixed to a midsole. 10. An injection-molded shoe provided with a sole in which at least a part of the outsole has a two-layer structure by a core member,
The core member is fitted and fixed in a concave portion formed in the outsole, and the concave portion of the outsole is formed by a protrusion for forming a concave portion of a side mold during injection molding of the outsole. An injection-molded shoe characterized in that it is formed so as to be open to the inside. 11. The injection molded shoe according to claim 10, wherein the core member is disposed on a heel. 12. The injection molded shoe according to claim 11, wherein a lower portion of the concave portion of the outsole extends rearward beyond the heel portion in a tongue shape, and the tongue-shaped rear end. The injection-molded shoe is characterized in that the portion is raised so as to enclose the core member of the heel portion and is fixed to the outsole.