JPS635081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a synthetic resin shoe sole in which rubber sole pieces are provided at the forefoot and heel.

Conventionally, synthetic resin shoe soles with a rubber sole piece have been manufactured by the rubber sole piece being molded into a mold by the injection pressure of the synthetic resin. It has the disadvantage that it cannot be fixed accurately because it deforms or moves.

According to the method of manufacturing a shoe sole according to the present invention, when molding a synthetic resin shoe sole, the rubber sole pieces 2 of the forefoot and heel portions are
0 and 20 are pressed in the lower mold 3, the press plate 5 is covered with the upper mold 7, and the foamed synthetic resin H is injected. To prevent deformation or movement within the mold, the rubber sole pieces 20, 20 of the forefoot and heel of the sole are placed in precise positions, and the other parts are made of foamed synthetic resin. Since the sole is made of H, it is possible to easily manufacture a shoe sole that is hard to slip and has excellent wear resistance.

That is, in the present invention, the foamable synthetic resin H is injected into a mold in which the rubber sole pieces 20, 20 of the forefoot part and the heel part are arranged, and is foamed and hardened to form the rubber sole pieces 20 of the forefoot part and the heel part. , 20 on the top surface and surroundings of synthetic resin H.
This is a method for manufacturing shoe soles with

1 to 5 show the method for manufacturing a shoe sole according to the present invention.
An example using the shoe sole manufacturing apparatus shown in the figure will be explained.

In this device, a pressing member 1 for pressing and fixing a mold is attached to the right end of a base 2, a lower mold 3 is fixed to the left of this pressing member 1, and a hinge 4 is attached to the left side of the lower mold 3 so that it can be opened and closed. A push plate 5 is attached to the lower die 3, and an upper die 7 is attached to the left end of the lower die 3 so as to be openable and closable by means of a hinge 6.

As shown in FIG. 2, the lower mold 3 fixed to the base 2 is engraved with a lower mold 8 (mold for the ground contact surface) of a predetermined shape of the sole, and the front part of the lower mold 8 is carved. Holding holes 9, 9 for fitting and holding the bottom surfaces 21, 21 of the rubber sole pieces 20, 20 are cut in the center of the heel portion, and peripheral wall portions 10, 10 are provided protruding from the periphery of the holding holes 9, 9. , fitting holes 11, 11, 11, 11 are formed at the four corners of the lower mold 3.

As shown in FIG. 3, the push plate 5 attached to the lower die 3 in a manner that can be opened and closed has an opening 12 having a shape substantially similar to the outer edge shape of the lower die 3, and a front tread portion of the opening 12. and guide protrusions 14, 14 having a large number of press rods 13 protruding from the outer periphery of the heel portion and fitting into the fitting holes 11, 11 of the lower mold 3;
are provided protrudingly at the upper right and lower left, and fitting holes 15, 15 are bored at the upper left and lower right.

As shown in FIG. 4, the upper mold 7, which is attached to the lower mold 3 in an openable and closable manner, has an upper inner mold 17 on the upper surface of the sole on the surface of the plate-shaped cover plate 16 that is in contact with the lower mold 3. The upper inner mold 17 has an outer peripheral shape that fits into the opening 12 of the push plate 5, and has a mold corresponding to the upper surface of the sole, and the upper inner mold 17 has a front tread part and a heel. A plurality of push pins 18 are provided protrudingly at arbitrary locations on the part,
Fitting holes 11, 11 of the lower mold 3 and fitting hole 1 of the push plate 5
The guide protrusions 19, 19 that fit with the lid plate 1
6, protruding from the upper left and lower right.

The rubber sole piece 20 is placed at the center of the front tread and heel of the shoe sole, and as shown in FIGS. 9 and 10, the rubber sole piece 20 is placed on the ground surface side. A peripheral wall part 22 is provided protruding from the outer peripheral edge of the bottom part 21 on which a groove part 24 is formed by applying unevenness for anti-slip, and an edge part 23 is formed on the outer periphery of this peripheral wall part 22.
It has a shape in which both ends of one groove portion 24 are dammed by the peripheral wall portion 22.

Note that the rubber sole piece for the heel also has a similar configuration.

Next, the present invention will be explained using the device.
As shown in FIG. 3, the rubber sole pieces 20, 20 for the forefoot and heel are fitted into the holding holes 9, 9 of the lower mold 3, and the press plate 5 is folded down and stacked on the lower mold 3. The rubber bottom pieces 20, 20 are pressed by a large number of push rods 13 of the plate 5 and a large number of push pins 18 of the upper mold 7, and the edges 23 of the rubber bottom pieces 20, 20 are brought into close contact with the peripheral wall 10 of the lower mold 3. and fix it to the state shown in FIG.

Liquid foamable synthetic resin H is injected through the opening 12 of this press plate 5, and the lid is immediately placed so that the upper mold 7 is stacked on the press plate 5, and the press member 1 at the right end of the base 2 is used to stack these The lower mold 3, press plate 5, and upper mold 7 are pressed together to foam and harden the synthetic resin H to form the state shown in FIG. 5, and the mold is removed to form the mold shown in FIGS. A shoe sole is formed by disposing rubber sole pieces 20, 20 at the forefoot and heel as shown in FIG.

Here, a two-component urethane type was used as the foamable synthetic resin H, but any synthetic resin that has foaming properties and hardens at room temperature or with almost no heating after foaming can be used instead. It's okay.

Furthermore, the bottom mold 8 of the bottom mold 3 is free to form various patterns of the sole, and the top inner mold 1 of the top mold 7 is free to form various patterns of the sole.
7 may be freely formed with an uneven pattern to make the sole lighter.

In the above embodiment, the rubber sole piece 20 of the forefoot and heel portion is provided with a peripheral wall portion 22 and an edge portion 23, but as shown in FIGS. 11 and 12, the edge portion 23 may be omitted. Rubber sole piece 2 for the forefoot and heel
0a, and as shown in FIG. 13, the peripheral wall part 10 of the lower mold 3 of the manufacturing apparatus may be omitted,
Furthermore, as shown in FIGS. 14 and 15, rubber sole pieces 20 of the forefoot and heel parts omit the peripheral wall part 22.
b, and as shown in FIG. 16, it may be molded using the same manufacturing apparatus as in the previous embodiment.

Here, the peripheral wall parts 10, 22 are made of synthetic resin foamed during molding, and the rubber sole pieces 20, 20 of the forefoot part and the heel part
This is to prevent it from entering the grooves 24 of a and 20b.

When molding the sole, adhesive may be applied to the upper side of the rubber sole piece in advance, and then the foamable synthetic resin H may be injected into a mold and molded.

As described above, according to the method of manufacturing a shoe sole according to the present invention, the rubber sole pieces 20, 20 of the forefoot and heel are pressed into the lower mold 3 using the push rods 13 of the push plate 5 and the push pins 18 of the upper mold 7. In the pressed state, the press plate 5 is covered with the upper mold 7 and the foamed synthetic resin H is injected, so that the rubber bottom piece does not deform or move within the mold due to the injection pressure of the synthetic resin and the foaming pressure. The rubber sole pieces 20, 20 of the forefoot and heel of the sole are placed in the correct position to prevent
Since the other parts are made of foamable synthetic resin H, it is possible to easily manufacture a shoe sole that is hard to slip and has excellent abrasion resistance.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the shoe sole manufacturing apparatus of the present invention, FIG. 2 is a partially omitted plan view of the lower mold of the same manufacturing apparatus, and FIG. 3 is a sectional view taken along the - line in FIG. 1. , FIG. 4 is an explanatory diagram showing a state in which a press plate is stacked on a lower mold with a rubber sole piece arranged thereon, FIG. 5 is a longitudinal sectional view of the mold in a molded state, and FIG. 6 is a bottom view of the molded sole. Fig. 7 is a partially omitted plan view of the sole of the shoe, Fig. 8 is a sectional view taken along the - line in Fig. 6, Fig. 9 is a bottom view of the rubber sole piece used in the present invention, and Fig. 10 is a sectional view taken along the - line in Fig. 6.
11 is a bottom view showing another embodiment of the rubber sole piece used in the present invention,
FIG. 12 is a sectional view taken along the - line in FIG. 11;
FIG. 13 is a partially omitted vertical cross-sectional view of a mold showing the molding state when using the rubber bottom piece, and FIG. 14 is a bottom view showing another embodiment of the rubber bottom piece used in the present invention.
Fig. 15 is a sectional view taken along the - line in Fig. 14;
FIG. 16 is a partially omitted longitudinal sectional view of a mold showing the molding state when the rubber sole piece is used. 1...Press member, 2...Base, 3...Lower mold, 4
... Hinge, 5 ... Push plate, 6 ... Hinge, 7 ... Upper mold, 8 ... Lower surface mold, 9 ... Holding hole, 10 ... Peripheral wall, 11 ... Fitting hole, 12 ... Opening Hole, 13... Push rod, 14... Guide projection, 15... Fitting hole, 16...
...Lid plate, 17...Top inner mold, 18...Push pin, 1
9...Guiding protrusion, 20, 20a, 20b...Rubber bottom piece of forefoot and heel part, 21...Bottom part, 22...
...peripheral wall part, 23...edge part, 24...groove part.

Claims (1)

[Claims] 1 After fitting the rubber sole pieces 20, 20 for the front and heel parts into the holding holes 9, 9 of the lower mold 3, the push plate 5 is fixed so as to fix the rubber sole pieces 20, 20 with a large number of press rods 13. is superimposed on the lower mold 3, and a large number of push pins 18
Cover the upper mold 7 so as to fix the rubber sole pieces 20, 20 with the rubber sole pieces 20, 20 for the forefoot and heel.
20 is pressed with the press rod 13 and push pin 18, a foamable synthetic resin H is injected into the mold, and the synthetic resin H is foamed and hardened to form the front and heel parts of the sole. A method of manufacturing a shoe sole, characterized in that rubber sole pieces 20, 20 are arranged in the center, and other parts are made of foamable synthetic resin H.