Method of making an inflatable shoe insole

Details Method of making an inflatable shoe insole Method of making an inflatable shoe insole

1990-11-02

1992-05-12

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264244, 264513, 264545, 156156, 156245, 156292, 425503, B29C 4900, B29C 4920

Patent

active

051125609

ABSTRACT:
A foot-support element such as an insole or a part of an insole is provided with a checkvalve through which it can be selectively inflated, the top and bottom walls of the insole being bridged by partitions which retain the shape upon pressurization. The insole is formed with upper and lower parts in upper and lower die members working together with an intermediate die member which, upon removal, allows the upper and lower die members to be brought together to fuse the parts of the insole together.

REFERENCES:
patent: 1310437 (1919-07-01), Roberts
patent: 1575388 (1926-03-01), Roberts
patent: 3825457 (1974-07-01), Holroyd et al.
patent: 3933967 (1976-01-01), Taylor
patent: 4224276 (1980-09-01), Gallizia
patent: 4722131 (1988-02-01), Huang

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