Shock absorbing structures

Details Shock absorbing structures Shock absorbing structures

1981-08-26

1988-10-18

Meyers, Steven N.

Boots, shoes, and leggings

Insoles

36 44, A43B 1340

Patent

active

047777397

ABSTRACT:
Shock absorbing structures suitable for footware and the like may utilize a flexible polyurethane of essentially linear structure containing unsatisfied hydroxyl groups and having a compression set of less than 15%, an elongation break of at least 500%, and a recovery which is delayed after compression by at least 0.7 seconds. The structures include a block or layer with one or more fluid cavities, each cavity having one or more relatively small passageways communicating the cavity with the exterior of the block or layer. The cavities may be closed by a separate layer bonded to the block or layer. In footware, the cavities may be strategically located and circular or rectangular in form with the passageways being similarly shaped and extending through the top of the layer or block.

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patent: 4008530 (1977-02-01), Gager
patent: 4129951 (1978-12-01), Petrosky
patent: 4170078 (1979-10-01), Moss
patent: 4223455 (1980-09-01), Vermeulen

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