FR2851131A1 - Heel for high-heeled shoe is made from cast hollow shell of lightweight metal filled with plastic for fastening to shoe - Google Patents

Abstract

The shoe heel is made from a cast hollow outer shell of a lightweight metal such as aluminum or duralumin, the mould being preferably of steel to resist the high temperatures involved. The shoe heel is made from a cast hollow outer shell of a lightweight metal such as aluminum or duralumin, the mould being preferably of steel to resist the high temperatures involved. The shell is filled with an injected plastic material, e.g. while held in a steel or alloy mould. The plastic is injected while hot to fill the pores in the inner surface of the shell for enhanced adhesion between the different materials. Once it has set the heel can be attached to the shoe in the normal way, i.e. by nailing or adhesive. The outer surface of the shell can have a metallic coating of nickel or chrome, and it can have a plastic tip to protect floors.

Description

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  The present invention relates to a shoe heel and its manufacturing process.

  In general, a shoe comprises a top or upper, a bottom consisting of a sole and a heel fixed by nailing or gluing.

  In the case of a heel fixation by gluing or nailing, it is necessary to use nailing or gluing materials, which limit the choice of materials (plastic, wood, etc ...) Currently the heels are made of various plastics, including polystyrene, ABS, PVC.

  Although these materials are generally satisfactory - with rather thick heels - the problems are evident in the LOUIS XV heels and needles, even if the latter are reinforced by metal inserts (pins -meca-n-indus or goup-il-le.s décolleté)) 25 Many heels break because of the little plastic that I recover-re-the-in-se-rt and which of this -fa-it-does not constitute a homogeneous resistant block, from which the fineness of the heels is limited in order to avoid the disadvantages listed above.

  The invention provides a manufacturing process which reinforces the plastic core by an external reinforcement (aluminum, duraluminium, etc.) The preferred method of manufacturing this invention is the following 1) Casting metal or other materials ( carcass) in a mold preferably made of steel to withstand the high temperatures of aluminum, dural or other materials. Figure 1 2) Inject a plastic material (polystyrene or ABS, etc.) into the interior of the core, which is to be compared to this second. operation can be carried out as follows Position the carcass of the heel made beforehand, in a mold preferably made of steel, in an ordinary mold (for ZAMAK or KM plastic injection) and inject the plastic material into the hollow of the heel.

  Figure 2 It is rather recommended to inject hot rather than pouring plastic, so that the plastic material becomes encrusted in the porosities left inside the hollow of the heel, and thus obtaining a perfect welding of the two materials.

Claims (5)

  1) Shoe heel characterized in that it consists of a metal element come from molding or casting and a plastic element in second operation come by injection or casting.   2) Heel according to claim: Characterized in that the metal or other materials 10 (carcass) is an alloy or mixture making it possible to obtain perfect solidity in walking and in traction which is currently lacking in this kind of manufacture.   3) According to claim 1 and 2, allows surface metallization (nickel plating, chrome plating) since the alloys used are conductive (electrolysis). 20 4) Heel according to claims 1 and 2 allows nailing and gluing on the plastic part as on an ordinary heel.   5) Heel according to claims 1, 2, 3, to use the metal part as anti-wear without altering the floors 30 (parquet, carpet ...) since these are light metals.   This last advantage can be achieved by a plastic cover which would become encrusted on the slightly chamfered part at the bottom of the heel.