JP3068270U - Plastic shank for footwear - Google Patents

Abstract

(57) Abstract: A plastic band plate (1) that covers at least half or more of the area from the heel portion of the lower surface of an insole (30) to the entire foot portion. The strip 1 is bent in a substantially arched shape that curves from the heel portion to the foot portion. A peripheral edge 2 is provided which gradually becomes thinner from the center portion of the thickness toward the periphery. The upper surface of the strip 1 is formed in a substantially planar shape. A reinforcing plate 5 is embedded along the longitudinal direction of the strip 1. The reinforcing plate 5 is formed of a metal material. A wide portion 4 having the maximum width of the strip 1 is formed around the tip of the strip 1 in the direction of the skirt portion. [Effect] The thin and soft midsole can be attached to sandals and pumps with heels. An extremely flexible heeled footwear can be provided.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a plastic shank for footwear which is suitable for being attached to, for example, pumps with heels or sandals with heels.

[0002]

[Prior art]

 The shank for shoes is also generally called the stepping core. Originally, a reinforcing core inserted between the midsole and the outsole that hits the foot of the shoe. Support and shape retention. In addition, it also plays a role in dispersing and absorbing the impact load during walking with appropriate elasticity. Most of these shanks are made of steel, and it is common to use a leaf spring that has been molded to fit the arch and quenched into the midsole. In women's shoes with high heels, they are supplied as an insole formed by a grommet on a hard backard (shank board) with a grommet (see the 17th Edition of Shoes Product Knowledge Revised by Senshin Co., Ltd.).

[0003]

[Problems to be solved by the invention]

 However, since the conventional shank is fixed to the midsole afterwards or has a structure that incorporates the shank in the midsole, the midsole of the heeled shoe that uses the shank has strength enough to withstand the mounting of the shank. A hard insole with is used. Therefore, it was impossible to use a thin and soft material as the insole in the conventional shank because of its strength.

Accordingly, the present invention has been made to solve the above-mentioned problem, and provides a plastic shank for footwear that enables a thin and soft insole to be used for sandals and pumps with heels. Aim.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the first means of the present invention is formed of a plastic strip 1 covering at least half or more of the area from the heel portion of the lower surface of the insole 30 to the whole foot. In addition to the provision of the peripheral edge 2 which becomes gradually thinner from the central portion toward the periphery, the upper surface of the band plate 1 is formed in a substantially planar shape, and is bent in a substantially arch shape which curves from the heel portion to the heel portion.

The second means embeds a reinforcing plate 5 along the longitudinal direction of the band plate 1 inside the band plate.

Further, the third means is that the reinforcing plate 5 is formed of a metal material.

The fourth means is to solve the problem by forming the wide portion 4 having the maximum width of the strip 1 around the tip of the strip 1 in the direction of the whip. .

[0009]

[Embodiment of the invention]

 Hereinafter, the present invention will be described based on illustrated examples.

[0010] The footwear shank of the present invention is mainly attached to heeled sandals or pumps, and is made of plastic covering at least half of the area from the heel portion on the lower surface of the midsole to the whole foot. (See FIG. 6). The strip 1 has a thicker central portion along the longitudinal direction and a peripheral edge that becomes gradually thinner from the central portion toward the periphery (see FIG. 3). Further, the upper surface of the band plate 1 is formed in a substantially planar shape, and the cross-sectional shape of the band plate 1 has a curved lower surface. The strip 1 is bent into a substantially arch shape that curves from the heel to the heel (see FIG. 2). The bending angle of the strip 1 is arbitrarily set according to the height of the heel.

In the illustrated strip 1, a reinforcing plate 5 is embedded along the longitudinal direction (see FIG. 1). The reinforcing plate 5 is mainly made of a metal material such as steel, and it is also possible to use a tough material such as glass fiber or carbon fiber for the reinforcing plate 5.

On the other hand, as the plastic material used for the strip 1, a material having excellent mechanical properties such as bending strength and impact strength is used, and further, a material having excellent heat resistance and cold resistance is preferable. Further, by using F.R.P, F.R.T.P, or the like having properties comparable to the strength, heat resistance, and dimensional stability of the metal material, it is possible to implement without using the reinforcing plate 5.

[0013] The width of the strip 1 is about 2.5 times or more the width of a commonly used iron shank. For example, footwear for women has a length of about 14.5 cm and a width of about 4.6 cm. Strip 1 is used. The plastic band plate 1 can be formed arbitrarily, and can be formed into a gently curved shape along the curved surface of the heel bulge or arch. In addition, by forming a curved concave portion 3 that forms a gentle curve along the curved surface of the heel on the upper surface of the heel portion of the band plate 1, it is possible to eliminate a sense of incongruity when the thin and soft insole 30 is used (FIG. 1).

Further, the width of the band plate 1 forms a wide portion 4 which is the widest at the tip end in the direction of the whip. The wide portion 4 is a portion which is formed so as to be widely used in the thin and soft midsole 30. The distal end of the wide portion 4 is spread while slightly curved.

The insole 30 to which the present invention is attached is a thin and soft type of a type used in a so-called California method in which the upper 10, the hem tape 20 and the insole 30 are sewn together. Material (see FIG. 4). The illustrated midsole 30 shows a state in which the sponge is included as a midsole 31, and a midsole back 32 is exposed on the lower surface of the midsole 30 suspended on the hem tape 20 (see FIG. 5). . The upper surface of the strip 1 is bonded to the exposed inner bottom 32 (see FIG. 6). Then, the insole 30 to which the plastic shank of the present invention is adhered is fixed to the outsole 50 by rubber crimping.

The plastic shank of the present invention is suitable for use in heeled pumps and heeled sandals, which are mainly used as women's shoes. It can be attached to footwear etc. Further, the insole 30 for bonding the plastic shank of the present invention is not limited to the thin and soft insole 30.

[0017]

[Effect of the invention]

 The present invention has achieved the original object by the configuration as described above.

That is, it is formed of a plastic strip 1 covering at least half or more of the area extending from the heel portion of the lower surface of the insole 30 to the whole foot portion, and becomes gradually thinner from the center portion of the thickness toward the periphery. In addition to providing the peripheral edge 2 and forming the upper surface of the strip 1 in a substantially planar shape and bending from the heel portion into a substantially arch shape that curves along the skirt, the plastic shank of the present invention is adapted to the insole 30. It can be glued in a straightened state to reinforce the thin and soft insole 30. As a result, sandals and pumps with heels can be made of the thin, soft midsole used in the California-style process.

Further, by embedding a reinforcing plate 5 along the longitudinal direction of the band plate 1 inside the band plate 1, the strength of the band plate 1 is increased, and the reinforcing plate 5 is formed of a metal material. As a result, strength and stability higher than those of conventional metal shanks were realized.

The wide portion 4 having the maximum width of the strip 1 is formed around the tip of the strip 1 in the direction of the whip, so that the middle bottom 3 of the thin and soft material is securely held. The strength of the insole 3 can be increased.

[0021] As described above, according to the present invention, a thin and soft insole can be attached to sandals or pumps with a heel, and it is possible to provide a heeled footwear with a high flexibility.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the plastic shank of the present invention.

FIG. 2 is a side view showing one embodiment of the plastic shank of the present invention.

FIG. 3 is a sectional view taken along line III-III shown in FIG.

FIG. 4 is a perspective view showing an embodiment using the plastic shank of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is an exploded perspective view showing a state in which the plastic shank of the present invention is adhered to the midsole;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip board 2 Perimeter edge 3 Curved concave part 4 Wide part 5 Reinforcement plate 10 Upper 20 Hem tape 30 Middle sole 31 Middle thing 32 Middle sole back 40 Outsole 50 heel

Claims (4)

[Utility model registration claims] 1. A peripheral edge which is formed of a plastic strip covering at least half or more of an area from a heel portion on a lower surface of an insole to a whole foot portion, and becomes gradually thinner from a central portion of a thickness toward a periphery. A plastic shank for footwear, characterized in that the upper surface of the band plate is formed in a substantially planar shape, and the band plate is bent in a substantially arch shape that curves from the heel portion to the foot portion. 2. The plastic shank for footwear according to claim 1, wherein a reinforcing plate extending along the longitudinal direction of the band plate is embedded in the band plate. 3. The plastic shank for footwear according to claim 1, wherein the reinforcing plate is formed of a metal material. 4. The plastic shank for footwear according to claim 1, wherein a wide portion having a maximum width of the band plate is formed at an end of the band plate in the direction of the whip.