Footwear sole with integrally molded shank

Details Footwear sole with integrally molded shank Footwear sole with integrally molded shank

1998-09-04

2000-05-16

Patterson, M. D.

Boots, shoes, and leggings

Boots and shoes

Having shoe-reinforcing plate

36108, 36 30R, 36 31, A43B 2300

Patent

active

060619295

ABSTRACT:
A footwear sole comprises a foot-shaped sole of a relatively cushioned, low density polymer foam, with a higher density, harder midfoot shank portion integrally fused within it. The sole may be a unitary footwear sole or may have an outsole or insole adhered thereto. A method of manufacture of the sole comprises forming a polymer foam sole piece, stamping out a portion of the midfoot, forming a shank of higher hardness polymer foam to fit the stamped-out midfoot portion of the sole piece, fitting the shank into the sole piece, and hot compression molding the sole piece and shank to form a unitary, integral sole. The sole of the invention is particularly useful as a sandal sole.

REFERENCES:
patent: 1281770 (1918-10-01), Engel
patent: 2640283 (1953-06-01), McCord
patent: 4079526 (1978-03-01), Fukuoka
patent: 4364188 (1982-12-01), Turner et al.
patent: 4419836 (1983-12-01), Wong
patent: 4614046 (1986-09-01), Dassler
patent: 4667423 (1987-05-01), Autry et al.
patent: 4757620 (1988-07-01), Tiitola
patent: 5025573 (1991-06-01), Giese et al.
patent: 5465507 (1995-11-01), Schumacher et al.
patent: 5720117 (1998-02-01), Toschi
patent: 5787610 (1998-08-01), Brooks

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