B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 35/12 (2010.01) B29D 35/06 (2010.01) B29D 35/08 (2010.01) A43B 1/14 (2006.01) A43B 21/20 (2006.01) B29C 44/02 (2006.01) B29C 44/04 (2006.01) B29C 45/00 (2006.01) B29D 31/515 (2006.01) B29D 31/508 (2006.01) B29D 31/51 (2006.01)
Patent
CA 2148646
In a new method of molding a shoe heel a molding material is injected into a shoe heel mold and a fluid is injected into the heel body before it has set to form therein at least one enclosed hollow chamber therein which provides a different degree of resilience to heel strike forces at the location of the chamber. A plurality of closely adjacent chambers may be provided to obtain the same effect, particularly when the heel is shallow. In another method the chamber is formed by a preformed hollow element that is incorporated into the shoe heel by the molding operation. The invention also includes apparatus for making such heels, and the heels when so made. The molded body may comprise a sole with an integral heel portion. A preformed body may be placed in the mold prior to a molding operation to ensure that the bottom chamber wall has a minimum thickness. The enclosed chamber may be vented to the ambient atmosphere or it may be sealed. The chamber when sealed may be at least partly filled with a gas or a liquid to adjust the degree of resilience, or it may be filled with a solid material of resilience different from that of the material from which the heel is molded.
Koch Mark Arthur
Krajcir Dezi Anthony
LandOfFree
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