FR2472930A1 - PAD FOR ORTHOPEDIC SHOE ADAPTATION - Google Patents

Abstract

THIS CUSHION OR BALL HAS A CORE 1 IN FLEXIBLE AND ELASTIC FOAM PLASTIC WHICH REGULARLY DECREASES IN THICKNESS TO THE EDGES, THE ABOVE OF WHICH IS COVERED WITH A FLEXIBLE FLAT MATERIAL 2 AND OF WHICH THE BOTTOM 3 IS COATED. CORE 1 HAS SUBSTANTIALLY SPHERICAL CLOSED DOORS WHICH ARE GAS-FILLED AND WHOSE DIAMETER IS GRADUALLY DECREASING TOWARDS THE EDGES. THE ADHESIVE LAYER ON THE BOTTOM IS PREDICTED FROM DRYING WITH A POLYVINYL CHLORIDE SHEET 4.

Description

The invention relates to a pad or ball for the adaptation

orthopedic shoe base, formed of a plastic core

tick flexible and elastic foam which decreases regularly in thickness-

  edge, the top of which is covered with a flexible flat material and the bottom of which is optionally coated with an adhesive. Such pads can be obtained from the specialist trade of orthopedic appliances. They are used to stuff

  painful support in the shoes by a flexible and elastic material-

tick or procure, if designed and placed accordingly, a

localized and additional support for the foot in the context of a

medically.

  According to these different applications, the pads offered have variable shapes and sizes. If they contain

  a foam plastic core, it has the same structure everywhere

cellular ture therefore also elastic properties which are the same everywhere. In the case of a treatment, as the human foot has rounded shapes, in many cases this results in differentiated support, which can be unpleasant. Furthermore, as

the foam cores must be produced individually, their manufacture

cation is expensive.

The invention aims to improve a bearing of the type indicated at the beginning in the direction of simpler manufacture and a

better foot comfort.

  According to an essential characteristic of the invention, the

  foam plastic core has sensitive closed pores -

spherical which are filled with a gas and whose diameter decreases

gradually towards the edges.

We can also say, conversely, that the diameter of the pores or spherical cells reaches its maximum value in the region

where the thickness of the foam plastic core is the greatest. Elas-

elasticity and in particular elastic deformability are therefore maximum

  males in this region and they decrease perfectly evenly towards the shoe parts located outside the pad. A particularly smooth transition can be obtained if the marginal zones of the core are completely free of pores and therefore have a mechanical resistance comparable to

that of leather or comparable material for the manufacture of shoes.

  q4729303 Different toooTm res or * iisab! s cone O n ri Oau

for the manufacture of nDou in foam applied salt r n _iui -cio-n.

  The use of a cross-linked foam polyethylene with iron cells of a

  bulk density from 70 to) 0 ki / m was found to be pcicu-

particularly advantageous. A soft Lelte: e has a diantr- mra: -ma of cell of about 0.8 mm. It can be produced in the form of a tape, provided on top of the coating layer dosed by a continuous process of doubling to the film and then

desired shape.

The shaping processes envisaged are first of all continuous stamping or stamping preceded by heating and the deformation of the starting material concerns all the parts of the pad. The deformation, which is essentieLhxaent a differentiated compression, produces an increase in the pressure of the gas in the pores, pressure which is all the more slender as the pores of the finished part are small. The resistance of the valve therefore increases towards the marginal zones, which is quite

desirable.

If used, the polyethylene foam preferably has a degree of chemical reduction between 30 and 60. S. ie

  degree of cross-linking is below this range, the stability

the standing charges is insufficient. If he

  is higher, the cushion no longer fits - by deformation plas-

  tick - to the desired extent to irregularities of the foot. 1. is best to stay within the range shown above to get

optimal properties from every point of view.

The layers of coverings or linings are preferably made, next to imitation leather, of fibers which are ground on the outside. This grinding releases the fiber ends of the veil and raises them, so that they are then erected perpendicular to the surface of the veil. The set of

these bits of fiber prevent irritation Do the skin by fr: .te-

  at the same time gives the foot a relatively secure hold

against lateral sliding.

  A nonlimiting example of a bearing

according to the invention is shown in the accompanying drawing.

  Figure 1 shows the bearing in longitudinal section.

nale. 1 designates the foam plastic core, the spherical pores of which

  riques have a diameter which decreases regularly towards the marginal zones. The foam core is provided on top with a flexible covering layer 2, in natural leather or imitation leather or a ground fiber veil. The underside 3 carries a layer of reactive adhesive, the drying of which is prevented by a covering sheet 4 in

polyvinyl chloride.

Figure 2 is a plan view of the pad of Figure 1. The main purpose of this representation is to make it clear that the top coating layer 2 covers the edges of the foam core 1 over a relatively large width, in order to thus producing a very smooth transition between the unpadded areas of a shoe and the flexible and elastic center of the core

of foam.

  The principle of the construction of a pad according to the invention is also advantageously applicable to the manufacture

heel or shoe padding.

Claims (3)

R E V E N D I C A T I O N S 1. 'Pad for the orthopedic adaptation of shoes, formed of a flexible and elastic foam plastic core which regularly decreases in thickness towards the edges, the top of which is covered with a flexible flat material and the bottom of which is possibly coated with an adhesive, characterized in that the core (1) of foam plastic material has substantially spherical closed pores which are filled with gas and whose diameter decreases or gradually changes to the edges. 2. Pad according to claim 1, characterized in that the marginal zones of the foam core (1) are completely free of pores. 3. Pad according to claim 1 or 2, characterized in that the core (1) is made of cross-linked polyethylene foam with cells   closed with an apparent density of 70 to 90 kg / m.