JPH0624482B2 - Foam midsole for shoe sole - Google Patents

Description

TECHNICAL FIELD The present invention relates to a foamed midsole for shoe soles.

(Prior Art) Conventionally, it is generally known that a hard plate (shank) is embedded from a non-stepping portion to a rearward portion of a foamed midsole to achieve landing stability during walking and running.

The heel of the foot prone or the stepping part of the foot supination when turning normally during normal walking or running, or as a natural movement of the foot due to fatigue of muscles or ligaments during long walking or running. It is a thing. At this time, since the forefoot and hind legs turn so as to twist, the twist of the forefoot and hindfoot is restrained by the shank embedded in the midsole corresponding to this part, and the foot during walking runs. There was a drawback that it hindered the natural movement of. From this point of view, a foamed midsole that does not use a shank is also commonly used, but since the pronation of the heel of the foot or the supination of the foot of the foot during walking or running is not restricted, the midsole is not used. In combination with the cushioning property of, excessive supination or supination is caused,
It had the drawback of causing damage to the leg muscles, ligaments, and joints.

(Problems to be Solved by the Invention) The present invention promotes natural movement of the foot during walking and running, and further prevents excessive pronation of the heel part of the foot and excessive supination of the stepped part of the foot. It is an object of the present invention to provide a foam midsole for a shoe sole that can be manufactured and has excellent durability.

(Means for Solving Problems) The present invention will be described with reference to the accompanying drawings.
2 is provided with a bent groove 14 in the lateral direction between the stepped rear portion 13 and the hard plate 21 is provided on the stepless portion 12 via the bent groove 14.
The foamed midsole for a shoe sole is characterized in that a hard plate 22 is embedded in the stepped rear portion 13 and a flexible reinforcing piece 3 is embedded in the groove side 141, and the foamed midsole for the shoe sole is the subject matter of the invention.

In the present invention, the midsole 1 is made of rubber foam, EV
A, a synthetic resin foam such as polyurethane is provided, and a single or a plurality of grooves 2 are provided in the lateral direction between the stepless portion 12 and the stepped rear portion 13. The groove 2 may be provided on the upper surface of the midsole or may be provided on the lower surface thereof.

The hard plates 21 and 22 embedded in the stepless part 12 and the rear part 13 of the midsole are epoxy resin, ABS resin, polyester resin, acrylic resin, polyamide resin, phenol resin, melamine resin, diallyl phthalate resin, fiber. It is composed of a synthetic resin plate such as a reinforced plastic or a metal plate, and if necessary, reinforcing ribs 212 ... 222 can be provided in the longitudinal direction thereof. The flexible reinforcing piece 3 embedded in the groove side 141 is made of cloth, leather, rubber or a synthetic resin sheet. These hard plates 21 and 22 and the reinforcing piece 3 can be embedded in the midsole. In the embedding molding, for example, the hard plate 21 is set in the stepless part 12 molding part via the groove forming projection 51 formed in the bottom part of the molding die 5, and the hard plate 22 is set in the stepping rear part 13 molding part. Forming protrusion 51
And the flexible reinforcing piece 3 is covered and set from the front end side 211 of the hard plate 21 to the rear end side 221 of the hard plate 22,
By introducing a foaming midsole molding material into the mold cavity and foaming the same, the hard plate 2
1, 22 and the flexible reinforcing piece 3 can be embedded in the midsole 1 at the time of molding the midsole. Hard plate 2
If the front end side 211 of the No. 1 and the rear end side 221 of the hard plate 22 are preliminarily joined to each other via the flexible reinforcing piece 3, these can be set in the molding die 5 at the same time, so that the molding work is efficient. And simple.

The foamed midsole of the present invention is completed as a shoe sole by attaching an outsole to the bottom thereof.

(Advantageous Effects of the Invention) Since the present invention is configured as described above, when the user wears shoes and walks or runs, the heel of the foot prone or suprates in natural movement of the foot. When removed, it is bent with the bending groove 1 as a boundary, and twisting between the stepped portion 12 of the midsole and the stepped rear portion 13 is allowed, and the stepped portion 12 of the midsole and the stepped rear portion 13 are respectively Hard plate 21
Since the hard plate 22 and the hard plate 22 are embedded, the excessive compression of the outer side a or the inner side b of the midsole in these parts is limited, and the hard plate 21 is not formed in these parts.
Since the hard plate 22 and the hard plate 22 act as a stabilizer (stabilizer plate), the stepped portion 12 of the midsole, the heel portion 11 adjacent to the rear of the stepped portion, the stepped rear portion 13 and the stepped central portion adjacent to the front side thereof. Excessive pronation and supination at 15 are suppressed. Therefore, the natural movement of the foot is promoted during walking and running, and moreover, excessive supination and supination of the foot are prevented.

Further, since the flexible reinforcing piece 3 is embedded in the bent groove portion side 14, the bendability of the bent groove 2 is not hindered, and the midsole is prevented from cracking from the bent groove 2 portion. It can be a foamed midsole with excellent durability.

[Brief description of drawings]

The drawings show examples, in which FIG. 1 is a sketch of a foamed midsole viewed from the bottom, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. It is a principal part sectional view which shows the molding state of the foaming midsole shown in the figure. Explanation of sign 1 …… Midsole, 11 …… Heel part 12 …… Non-stepping part, 13 …… Rear part of treading 14 …… Bending groove, 14 …… Bending groove side 15 …… Central part of treading, 21 …… Hard plate 211 …… Front end side, 212 …… Reinforcing rib 22 …… Hard plate, 221 …… Rear end side 222 …… Reinforcing rib, 3 …… Reinforcing piece 5 …… Molding die 51 …… Projection, a …… Mid Outer side of sole b …… Inner side of midsole

Claims (1)

[Claims] 1. A non-step portion 1 is provided with a bent groove 14 in a lateral direction between the non-step portion 12 and the rear part 13 of the stepped foot, and the bent groove 14 is interposed therebetween.
2. A foam midsole for a shoe sole, characterized in that a hard plate 21 is embedded in 2, a hard plate 22 is embedded in the rear part 13 of the tread, and a flexible reinforcing piece 3 is embedded in the groove side 141.