JPH0710574B2 - Injection molding shoe sole mold - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mold capable of molding the sole of an injection-molded boot.

[Prior Art] Today's synthetic resin injection-molded boots are shifting to boots having durability and design due to the demands of the times, and with this transition, the soles for injection-molded boots are also changed. Non-slip and multicolored soles are becoming popular.

Conventionally, as an injection-molded shoe sole mold for molding such a shoe sole, there is, for example, a mold described in Japanese Patent Publication No. 58-43081.

In this conventional mold, a bottom mold having a smooth fitting surface and a partial shoe sole space can be defined on the fitting surface, and the tip end surface abuts on the fitting surface of the bottom mold. And a dummy last having a connecting projection capable of connecting the bottom mold and the dummy last by bringing the connecting projection of the dummy last into surface contact with the fitting surface of the bottom mold. To form the partial shoe sole by injecting the partial shoe sole material into the partial shoe sole space, and then removing the dummy last and fitting the last mold to the bottom mold to form the book sole molding gap instead. Then, the shoe sole is formed by injecting the shoe sole molding material into the shoe sole molding space.

[Problems to be solved by the invention]

By the way, in this conventional injection molding shoe sole mold,
As mentioned above, since the dummy projection connecting protrusions were used in surface contact with the smooth fitting surface of the bottom mold, wear gap due to wear in the fitting portion of the connecting protrusions and the bottom mold due to long-term use. Is formed, which allows the partial sole molding material to flow into the wear gap during the partial sole molding.
There is a risk that the partial shoe sole may stick out and be formed on the bottom of the outsole of the formed shoe sole.

The present invention has been made against the background of the above-mentioned conventional technical problems, and absorbs a fitting impact at the time of fitting a bottom mold and a dummy last, and is formed in a fitting portion between the bottom mold and the dummy last. An object of the present invention is to provide an injection-molded shoe sole mold that can improve the durability of the mold by preventing the generation of wear voids.

[Means for solving problems]

That is, the present invention is an injection-molded shoe sole mold including a bottom mold having a fitting surface as a shoe sole molding void forming surface capable of forming a shoe sole molding void, and a dummy last. At least one of the last and the shoe sole molding void forming surface is provided with a connecting protrusion whose surface is in contact with the other shoe sole molding void forming surface, and the other shoe sole molding void forming surface. Provided is an injection-molding shoe sole mold characterized in that an elastic elevating means capable of elastically abutting a tip end surface of the connecting projection is embedded in a surface contact portion of the surface with the connecting projection. is there.

[Action]

According to the present invention, by adopting the configuration as described above, when the bottom mold and the dummy last are fitted to each other, the tip end surface of the linking protrusion that is erected on one shoe sole molding void forming surface has the other shoe. By contacting the elastic lifting means embedded in the bottom molding void formation surface with the elastic surface, the fitting impact is absorbed when the bottom mold and the dummy last are fitted, and it is formed in the fitting part between the bottom mold and the dummy last. It is possible to improve the durability of the mold by preventing the generation of wear gaps.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a central longitudinal sectional view of an injection-molded shoe sole mold according to an embodiment of the present invention, and FIG. 2 is a plan view of a bottom mold according to the present embodiment.
3 is a sectional view taken along the line II of FIG. 2, FIG. 4 is a bottom view of the dummy last of this embodiment, and FIG. 5 is an enlarged view of the X portion of FIG.
The figure shows the first part just before the bottom mold and dummy last are mated.
FIG. 7 is an enlarged view of the X part of the figure, and FIG.
The figure shows a central longitudinal sectional view of the injection-molded boots obtained by the mold of FIG. 7, FIG. 9 is a bottom view of the injection-molded boots obtained by the mold of FIG. 7, and FIG. II-II enlarged cross-sectional view, FIG. 11 is an enlarged cross-sectional view for explaining the sole state of the injection-molded boots of the present embodiment when walking.

First, referring to FIG. 1, the injection-molded shoe sole mold A of the present invention is mainly composed of a bottom mold 10 and a dummy last 20.

As shown in FIGS. 2 and 3, the bottom mold 10 is a base mold of the injection molding shoe sole mold A, and the fitting surface with the dummy last 20 has a bottom mold side sole molding. A bottom mold side forming surface 11 which is a void forming surface is formed by depression, and a dummy last side forming surface 21 which is a shoe last forming void forming surface on a dummy last side of a dummy last 20 described later is formed on the bottom mold side forming surface 11. Cylindrical projections (linking projections) 12 with which the front end surface 121 is in surface contact are provided upright.

The bottom mold 10 and the dummy last 20 are
It is made of hard aluminum, and the cylindrical projection 12 is made of steel harder than the dummy last 20.

Further, the standing positions and the number of standing of the cylindrical protrusions 12 are 5 at the left and right outer edge portions of the step portion 111 of the bottom mold side forming surface 11.
Five pieces are erected on the set (10 pieces) and the heel portion 112.

As shown in FIGS. 1 to 3, the length of the circular protrusion 12 is such that when the bottom mold 10 and the dummy last 20 are fitted,
A length of 121 is in surface contact with the dummy last side forming surface 21 of the dummy last 20.

In addition, the bottom mold side forming surface of the bottom mold 10
A raised surface 13 is formed on 11 so that the thickness of the shoe sole is approximately half the length of the cylindrical projection 12, and the outer peripheral portion of the cylindrical projection 12 of the raised surface 13 is an outer circumference for forming a projection movement limiting cylinder described later. Groove 14
It is engraved with a slight gap from the bottom mold side forming surface 11.

Furthermore, the heel 112 of the bottom mold 10 is formed with an injection hole 15 of the shoe sole molding material, while the stepless portion 113 is formed with an injection hole 16 of the main body molding material.

As shown in FIG. 4, the dummy last 20 is a last that is fitted on the bottom mold 10 so that the shoe sole molding gap 30 can be formed. The fitting surface with the bottom mold 10 has a dummy last side. The forming surface 21 is formed to be raised.

As shown in FIGS. 5 and 6, the surface abutting portion of the tip surface 121 of the cylindrical projection 12 on the dummy last side forming surface 21 of the dummy last 20 is elastically attached to the tip surface 121 of the cylindrical projection 12. An elastic elevating means 40 that enables surface contact is embedded.

The elastic lifting means 40 includes a slide pin 41 and a slide hole 4.
2, a spring 43, and a screw plug 44 (see FIG. 1).

The slide pin 40 is a cylindrical pin that is slidably inserted into the slide hole 42 and has a tip end surface 411 as an abutting surface of the tip end surface 121 of the cylindrical projection 12, and the tip end surface 411 of the slide pin 41 is
The diameter is slightly larger than the outer diameter of the tip surface 121 of the cylindrical projection 12, and the slide pin 41 is composed of a pin body 41a and a peripheral projection 41b formed at one end of the pin body 41a. .

The slide hole 42 is formed by the cylindrical protrusion 12 on the dummy last side forming surface 21.
At the surface contact portion with the front end surface 121 of the slide hole of the slide pin 42 formed by penetrating between the wall surfaces of the dummy last 20 in the axial direction of the cylindrical protrusion 12, on the dummy last side forming surface 21 side,
A sliding hole 421 of the pin main body 41a having a step edge and having a gradually reduced diameter is formed, and the step edge is the slide pin 4a.
The peripheral edge projection 41b of 1 serves as a stopper peripheral edge 422 for preventing the slide pin 41 from protruding.

The length of the sliding hole 421 is the same as that of the peripheral projection 4 of the slide pin 41.
The length is shorter than the length of the pin body 41a excluding the protrusion width of 1b by Δl, so that the tip of the inserted slide pin 41 is protruded from the dummy last side forming surface 21 by Δl.

The spring 43 is a member that is inserted into the slide hole 42 to give an elastic function to the slide pin 41, and includes a screw plug 44 (first
(See the drawing) is a stopper for fixing the slide hole 42 with a lid.

Thus, the bottom mold 10 and the dummy last 20 of this embodiment are
When the bottom molding side forming surface 11 and the dummy last side forming surface 21 are opposed to each other to form a shoe sole molding gap 30 and are fitted, the tip surface of the cylindrical protrusion 12 erected on the bottom mold 10 becomes a dummy. The elastic surface is brought into contact with the tip end surface 411 of the slide pin 41 of the elastic lifting means 40 embedded in the last 20.

That is, first, just before the bottom mold 10 and the dummy last 20 are completely fitted together, as shown in FIG. 6, the tip end of the tip portion in which the cylindrical projection 12 projects by Δl from the dummy last side forming surface of the slide pin 41. When the tip end of the slide pin 41 is pushed down by a protrusion amount Δl as shown in FIG. 5, the tip end 121 of the cylindrical projection 12 is brought into contact with the surface 411 by surface contact and then completely fitted. Tip surface 411 of slide pin 41
Elastically abuts the surface.

For this reason, the fitting impact between the bottom mold 10 and the dummy last 20 is alleviated, and the durability of the mold A is improved.

By injecting the shoe sole molding material from the injection hole 15 into the shoe sole molding space 30 of the injection-molded shoe sole mold A thus fitted, the shoe sole as shown in FIGS. 50 is injection molded.

The shoe sole 50 injection-molded by the injection-molded shoe sole mold A has a cylindrical protrusion 12 as shown in FIGS.
A protrusion insertion hole 51 and a protrusion floating gap 52 are formed at the standing position of, and a protrusion movement restricting cylinder 53 of a circular protrusion 91 of a boot body 80, which will be described later, is formed at a position where the outer peripheral groove 14 is formed.

In addition, when the injection molding shoe sole mold A is used for a long period of time,
Slide pin 41 made of a softer material than the cylindrical protrusion 12
Since the tip end surface 411 of the cylindrical projection 12 comes into contact with the surface of the cylindrical projection 12, the slide pin 41 has a protrusion margin of Δl. It is possible to prevent contact between the cylindrical projection 12 and the slide pin 41, thereby forming a wear gap.
Therefore, it is possible to prevent the shoe sole molding material from flowing into the cylindrical projection 12 through the wear gap, and to prevent the shoe sole molding material from adhering to the tip of the circular projection 91 of the shoe sole body 80, which will be described later. Since the slide pin 41 can be used even if the slide pin 41 is worn for the maximum length Δl due to the surface contact of 12, the durability of the injection-molded shoe sole mold A can be improved.

The shoe sole molding material is, for example, a vinyl chloride resin (vinyl chloride resin = straight PVC or ethylene-
It is injection-molded using an injection-molding material containing a vinyl chloride resin) plasticizer, a stabilizer, and a colorant (for example, a white pigment) as main components. When straight PVC is the main raw material, the mixing ratio of the sole molding material in this case is usually 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 1,050 to 1,450 relative to a plasticizer (dioctyl phthalate, dibutyl phthalate). 65 to 100 parts by weight, 1 to 3 parts by weight of stabilizer and 1 to 3 parts by weight of colorant are used, and when ethylene-vinyl chloride resin is used as a main raw material, the average degree of polymerization is 2,200. ~ 2,800 ethylene-vinyl chloride resin 10
Vinyl chloride resin by using a mixture of 65 to 95 parts by weight of a plasticizer (dioctyl phthalate, dibutyl phthalate, etc.), 1 to 3 parts by weight of a stabilizer, and 1 to 3 parts by weight of a coloring agent to 0 parts by weight. On the other hand, a shoe sole 50 having hardness and abrasion resistance is formed by slightly reducing the amount of the plasticizer.

The main body molding material contains, for example, a vinyl chloride resin, a plasticizer, a stabilizer, and a pigment (for example, a red pigment, a blue pigment, or a yellow pigment) as main components. The mixing ratio of the main body molding material at this time is usually 1,050 in the average degree of polymerization.
~ 1,450 vinyl chloride resin (so-called straight PVC) 10
By using 105 to 115 parts by weight of a plasticizer (dioctyl phthalate, dibutyl phthalate, etc.), 1 to 3 parts by weight of a stabilizer, and 1 to 3 parts by weight of a coloring agent to 0 parts by weight, a plasticizer to a vinyl chloride resin can be obtained. And the boots body 80 having flexibility is molded.

When molding the boots S by using the injection-molding boots mold A, as shown in FIG.
And the dummy last 20 are fitted to each other and the shoe sole 50 is injection-molded, then the dummy last 20 is removed, and then the dummy last 20 is replaced with the bottom mold 10 and the side mold as shown in FIG. 60 and the main body last 70 coated with the back cloth U are combined to form a main body molding void 80, and then a void molding material is injected from the injection hole 16 into the main body molding void 80 to mold the main body into the void 80. The boots S as shown in FIGS. 8 and 9 are formed by injecting the material.

Further, during the injection molding of the boots body 90, a part of the molding material of the boots flows into the cylindrical protrusion 12 erected on the bottom mold 10, and as a result, as shown in FIG. A circular protrusion 91, which is formed so as to be flush with the ground contact surface of the shoe 50, is formed integrally with the shoe sole main body 90, which is a slip prevention portion of the boot S.

As described above, the injection-molded shoe boot sole A according to this embodiment is used.
Is the bottom mold side forming surface 11 of the bottom mold 10,
Since the tip end surface 411 of the slide pin 41, which is a part of the dummy last side forming surface 21 of the dummy last 20, is elastically abutted,
By absorbing the fitting impact at the time of fitting the bottom mold and the dummy last, and by preventing the occurrence of wear gaps formed in the fitting part of the bottom mold and the dummy last,
The durability of the mold can be improved.

In the embodiment, the tip of the slide pin 41 is formed by the spring 43 so as to elastically project from the dummy last-side forming surface 21 by Δl. No wear gap is formed between the slide pin 41 and the cylindrical projection 12 even if the wear is caused by the surface contact of the twelve, so that the circular projection 91 of the shoe sole body 90 is formed by the formation of this wear gap. It is possible to prevent substitution filling by the material.

Further, since the tip end surface 411 of the slide pin 41 is formed to have a slightly larger diameter than the tip end surface 121 of the cylindrical projection 12, a large or small amount of contact occurs when the slide pin 41 and the cylindrical projection 411 make elastic contact. Even if there is a displacement, it is allowed.

Further, since the spring 43 is used as a material for giving the slide pin 41 of the elastic lifting / lowering means 40 an elastic function, the diameter cost does not increase so much.

In addition, in this embodiment, the protrusion floating space is provided around the circular protrusion 91.
As shown in Fig. 11, the circular protrusions are formed due to the formation of 52.
91 is pushed and bent like a sucker in the walking direction, and a more effective anti-slip effect can be obtained. Furthermore, the push-bending width of the circular protrusion 91 during walking is as follows:
This makes it possible to prevent the protrusion 91 from being damaged. In this case, as compared with the conventional shoe sole molding performed a plurality of times, deviation, bleeding, and burrs do not occur.

Furthermore, when the boots body 90 is made of different colors such as red, yellow or blue, and the sole 50 is white, for example, it is possible to give a design effect to the sole of the shoe, which makes it fashionable. It is rich.

In this embodiment, the cylindrical protrusion 12 is erected on the bottom mold side forming surface 11 and the elastic elevating means 40 is embedded in the dummy last side forming surface 21. You may replace the ground.

Further, in the present embodiment, the cylindrical protrusion 12 is illustrated as the connecting protrusion, but the shape thereof is not limited, such as a cylindrical protrusion or a prismatic protrusion.

Further, in this embodiment, the slide pin of the elastic lifting means 40 is
Although the spring 43 is used as the member for giving the elastic function to the 41, it may be a cylindrical elastic body using hydraulic pressure or water pressure.

The arrangement position of the cylindrical protrusion 12 may be at least the step portion 111 and the heel portion 112 of the bottom mold side forming surface 11, and may be the entire area of the bottom mold side forming surface 11, for example. The shape is not limited to a circle,
The number thereof can also be changed arbitrarily.

In addition, the outer peripheral groove 14 for molding the protrusion movement limiting cylinder 53 is
Although not always necessary, it is preferable to form the circular protrusions 91 to improve the slip resistance and prevent the circular protrusions 91 from being damaged or excessively bent.

Further, the shoe sole molding material and the main body molding material are not limited to those using vinyl chloride resin as the main raw material as described above,
Other thermoplastic synthetic resin may be used as a raw material. Furthermore, the colors of the boots main body 90 and the sole 50 are not limited to the above-mentioned red, blue or yellow, or white, and may be different from each other, and may be the same color in some cases. .

〔The invention's effect〕

According to the injection-molded shoe sole mold of the present invention, at the time of fitting the bottom mold and the dummy last, the tip end surface of the connecting projections erected on one shoe sole molding void forming surface is molded on the other shoe sole molding. By making elastic contact with the elastic elevating means buried in the void forming surface, the fitting impact is absorbed when the bottom mold and the dummy last are fitted, and they are formed in the fitting portion between the bottom mold and the dummy last. By preventing the generation of wear voids, the durability of the mold can be improved.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view of an injection-molded shoe sole mold according to an embodiment of the present invention, and FIG. 2 is a plan view of a bottom mold according to the present embodiment.
3 is a sectional view taken along the line II of FIG. 2, FIG. 4 is a bottom view of the dummy last of this embodiment, and FIG. 5 is an enlarged view of the X portion of FIG.
The figure shows the first part just before the bottom mold and dummy last are mated.
FIG. 7 is an enlarged view of the X portion of the figure, and FIG. 7 is a vertical cross-sectional view of the center of an injection-molded boots mold using the injection-molded sole mold of the present embodiment.
The figure shows a central longitudinal sectional view of the injection-molded boots obtained by the mold of FIG. 7, FIG. 9 is a bottom view of the injection-molded boots obtained by the mold of FIG. 7, and FIG. II-II enlarged cross-sectional view, FIG. 11 is an enlarged cross-sectional view for explaining the sole state of the injection-molded boots of the present embodiment when walking. A is an injection-molded shoe sole mold, 10 is a bottom mold, 11 is a bottom mold side forming surface (shoe bottom molding void forming surface), 12 is a cylindrical projection (continuous projection), 121 is a tip surface, and 20 is a dummy last. , 21 is a dummy last side forming surface (shoe bottom molding void forming surface), 30 is a shoe sole molding void, and 40 is an elastic lifting means.

Claims (1)

[Claims] 1. An injection-molded shoe sole mold including a bottom mold and a dummy last, the fitting surface of which is a shoe sole molding void forming surface capable of forming a shoe sole molding void, wherein the bottom mold and the dummy last. On one of the shoe sole molding void forming surface, a connecting projection whose surface is in surface contact with the other shoe sole molding void forming surface is erected, and the other shoe sole molding void forming surface. An injection-molding shoe sole mold characterized in that an elastic lifting means capable of elastically contacting a tip end surface of the connecting projection is embedded in a surface contact portion with the connecting projection.