JPS5819201A - Insole for footwear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of a sheet material having fixedly disposed cells on one surface which are independent of the phase U and which are closely spaced and filled with gas, the cells being formed by the foot of the person wearing the footwear. The present invention relates to an insole for footwear suitable for elastically absorbing force.

US Pat. No. 3,589,037 teaches an insole of the aforementioned type in which the cells are hemispherical in shape. The pressure-absorbing surface constituted by such cells is of no use at all, and, moreover, the cells run the risk of bursting in the areas under the greatest load when used with χ1, resulting in an overall poor wearing comfort. The heel receives the impact force.

Hemispherical cells can cause discomfort due to tight contact with the sole of the foot.

It is an object of the present invention to provide cells that together form a flat surface on which the foot rests, each of which is maximal so as to eliminate the feeling of bulge and the risk of individual cell rupture that occurs with hemispherical cells. An object of the present invention is to provide an insole having cells constituting a pressure absorbing surface of the insole.

The main feature of the invention is that the cells have an upper flat surface spaced from said sheet material in a mutually common horizontal plane, and another sheet material is placed on said flat surface so as to be parallel to said sheet material. It consists in firmly fixing it.

The gas-filled cells are subjected to different magnitudes of pressure along the sole of the foot, so that the insole thickness and cell dimensions can be determined by these forces. In field tests, substantially cylindrical cells with diameters of 5 to 10
with a distance of 3 to 5 m and a minimum distance of 0.5 to 4 m.
Cells spaced by 1 m indicate that a person of average weight can adequately absorb the maximum impact force that can occur when walking on a hard surface.

The aforementioned dimensions will vary depending on the shape of the cell and the gas pressure within the cell. Generally, this gas will consist of air at atmospheric pressure, although it is also conceivable to maintain the cell at a pressure higher than atmospheric pressure.

The space between each cell and the two sheets of material is filled with air or an elastic material such as foam rubber or expanded plastic, and the cell is filled in whole or in part with a flexible material such as a stretchable plastic material. It has partition walls made of a flexible material.

FIG. 1 illustrates an insole 1 for footwear. As is clear from FIG. 2, a plurality of air-filled closed cells, e.g. It has a shape. In FIG. 2, in the mounting example the contoured sheet 2 is made of gas-impermeable plastic material and the cells 4,
, 6.7 are the cylindrical walls 8. A sheet of flexible plastic material is formed by vacuum suction to form a cylinder with an upper wall 9 and an open bottom 1o. next,
The open bottom of each cell is hermetically sealed by a contoured sheet 2. The vacuum-formed sheet can be joined to the sheet 2 by welding the portions 11 located between each adjacent cell to the sheet 2 in an airtight state or by means of a thermosetting adhesive. The contoured sheet 3 rests on the end wall surface 9 of the cylindrical cell located in a common horizontal plane and is also permeable to air so as to provide ventilation for the sole of the foot. good, but reasonably impermeable to gases. The sheet 3 may therefore consist of a continuous gas-impermeable sheet of plastic material, a perforated plastic sheet, a woven fabric made of natural or synthetic fibers, a woven-backed plastic sheet, etc.

In the illustrated embodiment, the closed cells cover the entire surface of the insole and are of mutually equal dimensions, and the contoured sheets 2, 3 are of uniform thickness. Generally, the greatest pressure occurs within the anterior region of the foot, and the cells within this region are sized to elastically absorb increased pressure, such as when the wearer walks or lifts heavy objects. i.e. in the normal case the contoured sheets 2, 3 are not pressed together so as to come into contact with each other, and in the case of this mutual contact there is no risk of injury to the foot of the wearer. to form a rigid support or adjacency;

Generally, the pressure in the midfoot region is lower, so the cells in this region do not need to be sized to absorb high compressive forces as well as the cells in the anterior region of the foot. Having the same cell pattern and the same cell dimensions all over is more convenient from a manufacturing point of view, but with cells of low support capacity in areas of the insole where pressure is not as high and cells of high support capacity in areas of high pressure. It is also possible to set .

The shape of the cells may vary within wide limits; for example, the cells may consist of mutually adjacent gas-impermeable, gas-filled cubes arranged on the entire or partial surface of the insole. .

To improve the wear strength of the insole, another sheet material may be placed on the sheet or sheets joined to the cells'. The insole may also be constructed from multiple cell layers disposed between pairs of sheets. Also,
It is also possible to form the cell by a double sheet that is firmly welded to sheet 2.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of an insole according to the invention, with the upper sheet material partially cut away, and FIG. 2 is a sectional view taken along line nn in FIG. 1. 1 is the insole, 2 is the first sheet, 3 is the second sheet, 4
, 5, 6.7 are cells. Patent Applicant Svens Force, Tobaks, Actei Epolag.

Claims (4)

[Claims] (1) Multiple gas-filled and mutually independent cells (
4 to 7) are fixedly arranged in close proximity on one surface of the sheet (2), the cells are mutually independent from the others and elastically absorb forces directed toward the wearer's feet. In a footwear insole that is suitable for absorbing water, said cells have an upper flat surface spaced apart from a first sheet (2) and located in a common horizontal plane, and a second sheet (3).
) are placed in parallel on the first sheet (1) and are securely joined to the flat surface. (2) The insole according to claim 1, wherein the cells have a cylindrical shape. (3) The insole according to claim 1, wherein the cells have a cubic shape. (4) The pressure absorption capacity of cells (4 to 7) is
4. An insole according to any one of claims 1 to 3, characterized in that the insole varies on its surface.