FR2529762A1 - Plastic insert for flexible injection-mouldable soles. - Google Patents

Abstract

The invention relates to a plastic insert for flexible injection-mouldable soles, characterised in that a metal shank comprising a notch 3 is positioned in the insert, being held securely in place by the top of this insert 5 which positions the shank in the sole. The invention applies to the footwear industry.

Description

The present invention relates to a plastic insert in which is positioned a metal shank to rigidify a flexible injectable insole, in its part called camber,
In known devices of this type, the metal shank of variable shape and design depending on the sole, is either overmolded directly into the plastic insert requiring manual positioning of the shank in an injection mold, or a expensive system - a shank inserted in an insert that does not ensure a sufficiently precise hold of it in the mold base, resulting in some cases, significant scraps of these insoles
The insert according to the invention is characterized in that it makes it possible not to mold the shank (lower cost) but to position this shank after injection of the plastic insert in a housing perfectly adapted to the MR portion of the shank thus providing him with the sole a very precise position, and an effective strength for the use of this sole.

According to a first variant, the shank (shown in drawing No. 1) made of sheet metal has the shape of the section.. <(2) having at its back a recess mortise, is of different length and width according to the profile of the sole.

According to a second variant, the plastic insert appearing on the drawing NO 2 of variable shape and dimension following the heel portion of the sole, is characterized by a tongue (4) secured to the part JR of the insert in which is housed the mortise of the shank. This shank thus posed without any play, is held laterally by this tongue.

On the upper part of the insert (5) a variable thickness plate integral with the AR portion of the insert, whose dimension is calculated to maintain the shank from below upwards after positioning thereof, acts as a spring pressure on the shank due to the stiffness of the plastic used
The front view of the drawing N 2 represents the insert shank insert after positioning thereof. In the lower part of the insert a cavity (6) of variable shape, 'used for the fization of a bombout (wearing part of the sole) is used to maintain exactly in its place in the mold insert insert shank for the injection or casting of the material used for the manufacture of the sole
This device object of the invention can therefore be used in all cases or the profile of a flexible sole requires the maintenance of the foot in the arch, 'especially when it is too thin thickness.

Claims (1)

1 * Plastic insert characterized by the fact that it allows the introduction of a shank metal guided in the middle by a mortise, in a plastic tongue integral with the insert and held by the top of the insert acting as a pressure spring on the shank adapted to the profile of the sole.