Boots – shoes – and leggings – Soles – Spring heel
36 28, 36 29, A43B 1320, A43B 1318
An innersole for a sneaker or other athletic shoe that is adjustable to impart to the innersole characteristics appropriate to the particular use to which the shoe is to be put by the wearer, such as jumping, jogging or running. The innersole, contoured to fit in the shoe, is composed of a flexible foam plastic pad encased in a plastic film envelope. Extending from the rear of the envelope and projecting through the counter of the shoe is a vent tube having a control valve therein. When the valve is fully open, the insole then acts as a shock-absorbing cushion whereby when depressed by the foot of the wearer, air is expelled from the innersole through the open valve, and when pressure is released, the innersole then inhales air as it recovers its normal shape. When the valve is fully closed to hermetically seal the envelope, the innersole then functions as a pneumatic spring to impart bounce thereto. The degree of bounce imparted to the innersole relative to its shock absorbing characteristics is adjustable by partially opening the valve.
patent: 1596923 (1926-08-01), Cooney
patent: 2020240 (1935-11-01), Cochran
patent: 3716930 (1973-02-01), Brahm
patent: 4336661 (1982-06-01), Medrano
patent: 4590689 (1986-05-01), Rosenberg
patent: 4991317 (1991-02-01), Lakic
patent: 4995173 (1991-02-01), Spier
patent: 4999932 (1991-03-01), Grim
patent: 5224278 (1993-07-01), Jeon
patent: 5741568 (1998-04-01), Rudy
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