Boots – shoes – and leggings – Insoles – Laminated
Patent
1987-12-23
1989-07-04
Schroeder, Werner H.
Boots, shoes, and leggings
Insoles
Laminated
36 43, 128383, A43B 1338
Patent
active
048437387
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an inner sole used for inserting into shoes, more specifically, it relates to a shoe insole as a health instrument for promoting health by applying a line of magnetic force and a biasing stimulus to the sole of a foot.
2. Background of the Art
Conventionally, a shoe insole, as shown in FIG. 6, includes a rubber sheet 22 having a plurality of projections 21 fixed to the plantar arch of a leather insole body 20. The rubber sheet 22 is formed by laying permanent magnet grains in each projection 21, and its periphery is inserted into a groove 23 provided in the insole body 20 so as to be fixed integrally.
However, in the case of such insole, since the magnetized portion is present only partly in the insole 20, a line of magnetic force can not be applied entirely throughout the sole, thus it is difficult to obtain an effective magnetic treatment. Also, since the rubber sheet 22 is not strong physically, when the bending stress or the like has occurred in use, considerable difficulty was encountered as regards durability such as becoming unusable by cracks and tears produced on the rubber sheet 22.
In order to solve these problems, the inventor has developed a construction of an insole which includes pressing and magnetizing a mixture of rubber and magnetic powder, and laying a reinforcing sheet material within the center of the insole body. According to the construction, the line of magnetic force can be applied entirely throughout the sole, and tears of the insole due to bending stress can be prevented, thus improving the durability thereof.
However, in such improvement as mentioned above, though the reinforcing sheet material functions effectively to prevent tears and cracks of the insole, cracks occurring on its surfaces can be hardly prevented and a sufficient physical strength is difficult to obtain. Besides, when the projections are projected integrally on the surfaces of the insole, cracks occurring on the base portion of the projection will cause it to come off, consequently the treatment effect by the biasing stimulus will be reduced considerably.
It is an object of the present invention to provide a shoe insole which has solved the above problems by devising a method of laying the reinforcing sheet material into the insole body.
DISCLOSURE OF THE INVENTION
A shoe insole according to the present invention comprises an insole body which is formed by pressing and magnetizing a mixture of rubber and magnetic powder and which is provided with projections projected integrally thereon.
In the shoe insole according to the present invention, two sheets of reinforcing material which are in conformity with the shape of the insole body, are laid within the insole body and each reinforcing sheet material is positioned along the vicinity of its surfaces.
According to the present invention, since the insole body is magnetized entirely, a line of magnetic force can be applied to the entire sole of a foot, thus the magnetic treatment effect can be improved. Also, since the two sheets of reinforcing material are laid within the insole body, cracks and tears caused by bending stress can be prevented completely, improving the durability of the insole body. Moreover, since the two sheets of reinforcing material are positioned along the surfaces of the insole body, the occurrence of cracks thereon can be also prevented, thus the physical strength is improved and falling of the projection caused by the cracks occurring at the base portion of the projection is prevented, so that there is no possibility of reducing the treatment effect by the biasing force.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view showing a shoe insole according to one embodiment of the present invention,
FIG. 2 is a vertical sectional view of a shoe insole taken along the line A--A of FIG. 1,
FIG. 3 is an enlarged sectional view showing the projected portion of an insole body,
FIG. 4 is a flow sheet showing a manufacturing process of a shoe insole,
FIG. 5 is a perspective v
REFERENCES:
patent: 2307416 (1943-01-01), Margolin
patent: 4033054 (1977-07-01), Fukuoka
patent: 4223458 (1980-09-01), Kihara
patent: 4727661 (1988-03-01), Kuhn
Biefeld D.
Nihonkenkozoshinkenkyukai Co., Ltd.
Schroeder Werner H.
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