Resilient molded heels for boots and shoes

Details Resilient molded heels for boots and shoes Resilient molded heels for boots and shoes

1997-06-11

1999-11-09

Dayoan, B.

Boots, shoes, and leggings

Heels

Cushion

36 28, A43B 2126, A43B 1318

Patent

active

059790792

ABSTRACT:
Molded boot and shoe heels are made by injecting a foamable plastics molding material into a heel mold and thereafter injecting a pressurized gaseous fluid into the heel body after it has formed an outer skin against the mold inner surfaces but before it has fully set in order to displace and compress the foaming material and form within the heel at the point of injection at least one enclosed hollow chamber 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. A preformed member may be molded into the heel to form the heel outer surface and ensure a minimum heel wall thickness at this location. The heel may be molded integrally with a sole part. The enclosed chamber may be vented to the ambient atmosphere or it may be sealed. The chamber may be at least partly filled with a material of resilience different from that of the material from which the heel is molded. In another molded heel structure a chamber is formed in the heel by a preformed hollow member attached to the underside of the boot or shoe upper, the member being incorporated into the shoe heel by the molding operation. An insole mounted inside the upper has a plug of lower resilience material that fits into the chamber formed by the hollow element to determine the resilience to heel strike.

REFERENCES:
patent: 1373287 (1921-03-01), Ammann
patent: 1531306 (1925-03-01), Percivall
patent: 1819565 (1931-08-01), McBride
patent: 2717461 (1955-09-01), Pinaud
patent: 3044190 (1962-07-01), Urbany
patent: 3237320 (1966-03-01), Couture
patent: 5577334 (1996-11-01), Park
patent: 5761831 (1998-06-01), Cho

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