JP2759612B2 - Injection molded shoes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The upper material is integrated with the sole by injecting the sole material.
Injection-molded shoes with a shoe core embedded in the sole
The heel core material with the shank and heel core is integrated into the sole
The present invention relates to the injection-molded shoe buried at the time of injection molding .

[0002]

2. Description of the Related Art Generally, in the case of shoes with a stepped heel, a load (for example, a load during normal running or walking, or an impact) is applied to a heel (heel) when the shoe is worn. Load, etc.), and a drop force or a bending force due to the same load acts on the non-stepped portion. Therefore, a high-strength structure capable of withstanding the above-mentioned load is required for the heel portion, while a non-step portion needs to be provided with a fall prevention measure and a resilience to bending, as well as an unreliable structure. The part where the tread portion and the heel portion are continuously integrated is required to have a shape retaining property for maintaining a comfortable wearing feeling.

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

[0004] However, if the above-mentioned technique of the heel portion is applied to shoes by direct sawing, it is necessary to change the injection material of the heel portion and the other portion, which not only complicates the structure of the mold, but also The heel portion and other portions do not peel off during wear, so that a material must be carefully selected to maintain the integral structure of these portions, and the effect of direct cutting, which is a reduction in cost, is lost. In addition, the injected material fills the entire heel, which also increases the weight of the shoe.

As a solution to these problems, it is conceivable to use a heel core. However, the heel core is lifted during injection , so that good injection cannot be performed, and it is difficult to provide a shoe with a heel step that can withstand practical use. .

[0006] Further, even when the above-mentioned technique in the shank portion is applied to shoes by direct sawing, a shank mounting step is required, and not only the effect of direct soaring, which is also a reduction in cost, is lost, but also There is a high possibility that the shoe will be detached from the shoe sole during wear, and the wearability will be impaired and the durability or quality of the shoe will be reduced.

[0007] For these reasons, shoes having no heel step have conventionally been generally used in direct sawing shoes.

However, with the recent diversification of lifestyles and the promotion of luxury tastes, the demand for diversification of designs has increased rapidly, and even shoes using direct sawing, which have a heel step, are lightweight and low cost. In addition, there is an urgent need to develop a material having excellent durability without peeling off the heel core and the shank.

Therefore, the applicant of the present invention
(A) Sole with shank material and sole material (Japanese Patent Application No.
-277168), (b) Sole with integrated shank and heel core (see Japanese Utility Model Application No. 3-95032), (c) Limited physical properties (flexural modulus, rigidity, restoration) Sole using a shank material having a force
No. 189101) has been proposed.

The above technique (a) is not limited to the conventional concept of attaching the conventional shank from the foot contact surface side of the shoe sole, and attaches the shank from the ground contact surface side and injects the shoe sole. It is embedded integrally with the material and satisfactorily prevents the shank from separating from the sole material.

The technique (b) breaks the existing concept of shank and heel core as separate sole parts, and integrates them while maintaining the function of each of them to form one sole. It is a component for shoe soles, and it is an epoch-making product that not only prevents lifting of the heel core at the time of injection and detachment of the shank at the time of wearing, but also can omit the mounting process of the shank. is there.

Further, the technique (c) provides a shank having physical properties adapted to a specific depression state and a bending force different from conventional leather shoes or the like added to a stepped portion of an injection-type shoe, This forms the basis of the present invention described above (a) or (b) or described later.

The present invention provides a shoe sole for responding to the above-mentioned urgent business.
For shoes with a shank and a heel core that are easy to bury
Provide injection molded shoes with a core, especially with a heel step
The porpose is to do. Further, the present invention provides the above-mentioned shoe core material.
We offer the above-mentioned injection molded shoes with excellent anchoring effect on the shank.
The purpose is to provide. Further, the present invention provides a
Providing the above-mentioned injection molded shoes suitable for being equipped on the bottom of the heel
The purpose is to do.

[0014]

According to the present invention, an insole is mounted.
The upper material that has been squeezed out of the shoe sole
The core material for shoes is integrated with the shank and heel core.
An injection-molded shoe embedded in a shoe sole, wherein the shoe core material is provided.
Indicates that the upper surface of the shank portion matches the shape of the foot contact surface.
It has a surface shape, and the upper surface is attached to the lower surface of the midsole
The shoe sole material is further provided between the heel core and the midsole.
Injection molding, filled and buried in the shoe sole
Make your shoes a gist. Further, in the present invention, the shank portion may include:
A hole through which the sole material passes, and an opening above the hole
Injection molding shoes, the diameter of which is larger than the diameter opening downward,
Further, the heel core has an injection molded shoe having a hollow portion.
And In addition, according to the present invention, an anti-skid
The above-mentioned injection-molded shoe to be equipped, wherein the heel core portion is
A rivet insertion hole communicating vertically,
Injection molded shoes with rivets for anti-skid equipment
Is the gist.

In the present invention, the shank and the heel core 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, when the heel core portion has a hollow portion, the heel core portion has a structure including a combination of a lid portion and a box portion, and the lid portion and the box portion are made of different materials. , And these can be combined to form the heel core. In this case, a configuration in which a part of the surface on the front side (non-stepping side) of the box portion extends forward and the extended portion becomes a shank portion (that is, the main body of the heel core portion) (Integral molding) in which the box portion and the shank portion are made of the same material. Alternatively, the shank portion and the lid of the heel core may be integrally formed, and the lid may be combined with the box of the heel core.

Usually, in the injection-molded shoe of the present invention, a shoe core material
The shank and the heel core are integrally formed.

As described above, as the same or different materials, as described above, 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. At the same time, considering that the shank part and the heel core part can be integrally molded in at least a part of these parts, and that good adhesion with the injection material is also important, For example, the material may be appropriately selected from the shank materials and the like disclosed in the publication (c) according to the prior proposal by the present applicant.

[0019]

[Action] The above-mentioned shoe core material in which the shank portion and the heel core portion are integrated and the upper surface shape matches the shape of the lower surface of the midsole ,
Upper material (in the present invention, a shell, sock-like backing cloth, etc.
Before fitting it into the last mold.
(Attached to a par material by sewing or the like) , and is also attached to the lower surface by bonding or the like. Of course, the upper
After fitting the material and the insole integrally sewn into the last mold, the shoe core material on the lower surface of the insole,
It can also be attached by snap, sewing or other suitable means.

In this state, the side mold and the bottom mold are set and injection is performed.
The injection material does not cause the shoe core to float.

In the injection-molded shoe of the present invention, since the upper surface of the shoe core material conforms to the shape of the lower surface of the insole as described above, for example, the upper surface of the insole may be In the case of a so-called anatomy structure that matches the shape, if this anatomy structure is extended to the lower surface of the midsole, the upper surface shape of the core material for shoes will match the lower surface of the inner bottom of the anatomy structure. The anatomy structure, which has generally been impossible for a stepped heel shoe using a shank, can be easily applied.

Further, in the injection-molded shoe of the present invention, as described above , the shoe core material is such that the shank portion and the heel core portion are integrated and the upper surface shape only conforms to the shape of the insole lower surface. Instead, the shoe core material is embedded in the injected shoe sole material and becomes integral with the shoe, so that the shoe core material is removed from the shoe body (insole, outsole, etc.) while the shoe using the shoe core material is being worn. No floating, peeling, detachment, etc. will occur.

At this time, the shank portion is filled with a sole material.
If the hole to make is provided, the injected sole material,
Since the hole is filled, the shoe core and the insole are
And put them together. In addition, the diameter opening above the hole
Is larger than the diameter opening downward,
Force that causes the shank to move, peel, detach, etc.
The shank can move freely from the shoe sole even if
And not. Further, in the injection molded shoe of the present invention, the heel core and the middle
Since the sole material is filled between the sole and the sole, it is large when worn.
The cushioning property of the heel part where a heavy load is applied to the sole material
More can be expressed .

In addition, by appropriately providing a plurality (a plurality) of the above-mentioned holes at appropriate positions of the shank portion and the heel core portion, a shoe
An adhesive force due to a good anchoring effect can be obtained over the entire core material .

Further, in the injection-molded shoe of the present invention, by using the above-mentioned shoe core material, the entire heel (heel) can be formed.
Since the injection material is not filled, the weight of the shoe can be reduced. At this time, since the heel core has a hollow structure, the weight of the heel core itself is reduced, which further contributes to the weight reduction of the shoe.

By the way, in order to prevent slipping of shoes in heavy snowfall areas, cold areas, and the like, anti-slip equipment (for example, Japanese Utility Model Application No.
910, etc.). In this case, conventionally, after forming the shoe sole by direct sawing or the like, a hole for penetrating the heel contact surface and the insole upper surface at the position of the anti-skid device is drilled, and the anti-skid device is fixed to the through hole with a rivet. Was. Therefore,
Snowmelt water etc. can enter the inside of the shoe through this through hole,
Alternatively, a screw for fixing the rivet is exposed on the upper surface of the insole, which impairs a feeling of wearing.

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

According to the injection-molded shoes of the present invention, it is possible to prevent water leakage and screw exposure associated with the above-mentioned anti-skid equipment by an operation different from those of the prior arts.

That is, in the injection molded shoe of the present invention,
Before attaching the shoe core material to the lower surface of the insole as described above, insert a rivet into the hole through which the sole material provided in the heel core portion of the core material passes, and rivet the upper surface of the heel core portion. Expose the fastening screws. The shoe core material into which the rivet has been inserted is attached to the lower surface of the midsole as described above, fitted in the last mold, the side mold and the bottom mold are set, and the shoe sole material is injected .

As a result, a shoe is formed in which the rivet for installing the anti-skid device is attached to the heel. At this time, if the bottom mold used is a bottom mold whose upper surface has been subjected to a groove cutting process for fitting the rivet tip, the tip 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 grooving is used, only the opening of the rivet is exposed. Therefore, the attachment of the anti-skid device is performed by these exposed portions. Even if the opening is not exposed, the shoe sole material formed by injection is a flexible material, so that it is very easy to attach the anti-skid device.

[0031] Thus, the rivet is firmly fixed to the shoe core material by injection material that enters into the rivet insertion hole, the insertion hole to eliminate the leakage by injection filling the pores ( The so-called packing action of the injection material secures the rivet and prevents water leakage). Moreover, the rivet fastening screw is not exposed on the upper surface of the inner bottom as it is embedded in the injection material.

Therefore, according to the injection-molded shoe of the present invention, the problem existing in the conventional shoes equipped with anti-skid gear can be completely solved by a different operation from the above-mentioned prior art proposed by the present applicant. .

At this time, the heel core portion should be at least so that the rear end portion is thicker than the front end portion (thicker in the heel height direction, in other words, higher in the heel height direction). The following effects can be obtained by using a two-tier thick structure.

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

The front end is made thinner (in other words,
The reason why the packing action of the front end portion is strengthened) is that the force applied to the anti-skid device during running or walking opposes this force because the front end portion is overwhelmingly greater than the rear end portion.

[0036]

FIG. 1 shows an embodiment of an injection molded shoe according to the present invention.
To illustrate the shoe core material are, notched portion of the sole core, and is an exploded perspective view showing the Kakatoshin portion into two parts, FIG. 2 is a plan view of FIG. 1 And FIG. 3 is a diagram of FIG.
It is sectional drawing in the direction of arrow -A '.

In FIGS. 1 to 3, reference numeral 1 denotes a shoe core material main body . In this example, the heel core portion 3 is a combination structure of a box portion 31 and a lid portion 32. Is a hollow portion 4 of the heel core. In this example, the box portion 31 and the lid portion 3 which are constituent members of the shank portion 2 and the heel core portion 3 are provided.
2 are all formed as an integral molded product of the same material.

The shank portion 2 and the heel core portion 3 are provided with a plurality of holes 5 (9 in this example) and holes 6 (2 in this example). Has a diameter 51 opening toward the lower surface side of the inner sole (that is, the upper surface side of the shoe core material 1) is larger than a diameter 52 opening toward the lower surface side of the shoe core material 1.

The box portion 31 constituting the heel core portion is
In this example, as shown, the rear end portion has a two-stage thick configuration so that the rear end portion is thicker (higher) than the front end portion. On the other hand, the lid portion 32 has a concave portion 321 at the center portion, and a hole 6 ′ corresponding to the hole 6 is formed. Then, the box portion 31 and the lid portion 32 are combined with appropriate combination means (for example, holes 6 << 6 '>> and 6
<6 '>, in other words, a female projection and a male projection (not shown) provided substantially at the center of the box portion 31 are combined and fixed to form a heel core portion.

The upper surface of the shoe core 1 in which the box portion 31 and the lid portion 32 are combined in this manner (in this example, the upper surface of the shank portion 2 and the box portion 31 forming the heel core portion 3). (The shape of the combination of the upper peripheral surface and the upper peripheral surface of the lid 32) matches the lower surface shape of the midsole 13 (see FIG. 4). Therefore, if the upper surface of the insole 13 and anatomy structure, if not adversely to the lower surface of the insole 13 to the structure, shoe
The top surface shape of the core material 1 also has an anatomy structure.

The injection molding of the present invention configured as described above
Shoes, etc. aspects used for the case of applying the non-slip instrument equipped shoes per, with reference also to FIG. 4, which shows a portion of the products using shoe core 1 will be described below. First, the heel core 3
The two rivets 10, 10 'for fixing the anti-skid device are inserted into the holes 6, 6, 6', 6 '. At this time, the rivet fastening screws 11 and 11 ′ are exposed on the upper surface of the lid 32, but the recesses 32 provided in the lid 32 are provided.
1 and does not protrude above the lid 32.

[0042] In this way the shoe core 1 was fastened rivets 10, 10 'and, the upper material (in this example,胛被) 1
2 is attached to the midsole 13 sewn in 2 by sewing or an adhesive. This is fitted in the last mold (not shown),
Again, a side mold and a bottom mold (not shown) are set (in this example, use is made of a bottom mold which has not been subjected to a groove cutting process in which the leading ends of the rivets 10, 10 'are fitted), and the shoe sole material 14 is injected .

At the time of this injection, the shoe core 1 attached to the insole 13 by sewing, adhesive, or the like becomes the injection material 1
There is no such thing as being lifted by 4. Therefore, the injection molded shoe of the present invention in a good state as shown in FIG. 4 can be easily obtained.

The heel (heel) 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 the positions for attaching the anti-skid devices 15 and the anti-skid devices 15 are fixed by the rivets 10 and 10', as shown in FIG. The product is completed.

In the product shown in FIG. 4, the front end (the part on the side of the shank 2) of the heel core 3 of the shoe core 1 is shown.
However, since the thickness is thinner than the rear end (the height in the heel height direction is lower), the front end α is filled with a large amount of the sole material 14 and the rear end β is A small amount of sole material 1
4 is filled. Accordingly, the rivet 10 inserted into the holes 6, 6 'on the front end side has a larger amount of sole material than the rivet 10' inserted into the holes 6, 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 1 than the rivet 10 '. As a result, when running or walking on a frozen road surface, the anti-skid 15
The rivet 10 does not extend and the tightening of the anti-skid device 15 is not loosened by the force strongly applied to the front side of the vehicle.

Also, in the product shown in FIG. 4, the rivets 10, 10 'are fixed to the shoe core 1 before the shoe sole material 14 is injected. Is added to the rivets 10, 10 ', and snowmelt water does not leak into the shoe sole from around the rivets 10, 10'.

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

Further, the product shown in FIG.
And the heel core portion 3 are integrated, the upper surface shape matches the shape of the lower surface of the insole 13, and the shoe core material 1 in which the holes 5, 6, 6 ′ for passing the sole material 14 are perforated, Since it is embedded in the sole material 14 and is integrated with the shoe, the shoe core 1
Does not cause looseness, peeling or detachment from the insole 13 or the sole 14.

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 volume of the shoe core 1, and the heel core 3 has the hollow portion 4. Therefore, the weight of the shoe can be significantly reduced.

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

[0051]

As described in detail above, the injection molding of the present invention
According to the shoes , the following effects can be obtained.

(1) The core material for the shoe has an upper surface shape that matches the lower surface shape of the insole, and is embedded in the injected shoe sole material to be integrated with the shoe. And the core material can be fixed and held in close contact with each other, so that the core material does not move, peel, or separate.

(2) Shank the hole through which the sole material passes
In the case where the shoe sole material is provided in the portion , an anchoring effect can be obtained by the shoe sole material filled in the hole, and the shoe core material and the shoe sole material can be more strongly fixed and held.

(3) When a hollow portion is provided in the heel core, shoes
In addition to the weight reduction by using the core material , the weight reduction by the hollow portion is added, so that further weight reduction can be realized.

(4) In the case where the anti-skid device is provided on the heel portion, the problem of water leakage from the insertion hole of the conventional rivet for fixing the anti-skid device is eliminated, and the conventional rivet fastening screw causes the conventional screw to have poor contact with the foot. Can also be eliminated. Moreover, the conventional rivet insertion hole drilling process is eliminated,
Productivity is also greatly improved. At this time, by setting the thickness of the heel core portion to be thin at the front portion and thicker at the rear portion, the tightening effect of the anti-skid device can be improved by at least two steps thick. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an example of a shoe core material used in an injection-molded shoe of the present invention.

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

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

FIG. 4 is a partial sectional view for explaining one embodiment of the injection molded shoe of the present invention.

[Explanation of symbols]

1 shoe core material 2 shank part 3 heel core part 31 box part constituting heel core part 32 lid part constituting heel core part 321 recess provided in lid part 4 hollow part of heel core part 5, 6, 6 'Hole 51 through which sole material is passed 51 Opening on the lower surface of the inner bottom of hole 5 52 Opening (of hole 5) opposite to 51 10, 10' Rivets for attaching anti-skid device 15, 11 'Riveting Rib 12 Shell 13 Inner sole 14 Sole material 15 Anti-skid

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A43B 13/42 101 A43B 10/00 101 A

Claims (4)

(57) [Claims] 1. The shoe according to claim 1, wherein the upper material to which the insole is attached is a shoe.
With the shank part, which is integrated with the shoe sole by injecting the sole material
Injection molding with a shoe core integral with the heel core embedded in the shoe sole
A shoe, wherein the shoe core has an upper surface shape in which an upper surface of the shank portion conforms to a foot contact surface shape.
And the upper surface is attached to the lower surface of the midsole.
The sole material is filled between the heel core and the midsole.
An injection-molded shoe , wherein the shoe is embedded in the sole of the shoe. 2. The shank portion allows a sole material to pass therethrough.
The hole that opens to the upper side of the hole
2. The method according to claim 1, wherein the diameter is larger than an opening diameter.
Injection molded shoes . 3. The heel core portion has a hollow portion.
The injection molded shoe according to claim 1 or 2, characterized in that: 4. An anti-slip device is provided on a bottom surface of a heel portion of the sole.
4. The injection-molded shoe according to claim 1, wherein the heel core has a rivet insertion hole communicating vertically.
However, a rivet for anti-skid equipment is communicated with the insertion hole.
Injection molded shoes .