Boots – shoes – and leggings – Soles – Cushion
Patent
1988-03-28
1989-01-17
Watkins, Donald
Boots, shoes, and leggings
Soles
Cushion
36 29, 36 30R, A43B 1318
Patent
active
047980095
ABSTRACT:
The spring comprises layers of resilient material connected and spaced apart by compression members. The compression members are also spaced apart and indexed so that those between one pair of layers are located opposite the spaces between the compression members between the adjacent pair of layers. Springs of various shapes and areas are cut from sheets of spring structure and the spring rates are expressed in terms of pounds per inch per square inch of spring work area. Spring rates range from 1000 to 1250 pounds per inch per square inch of spring. Work capacities range from 13 to 120 inch pounds per square inch of spring. Ratios of work capacity to weight range from about 200 for springs about 1/4 inch thick to 600 for springs 3/4 inch thick. The cavities in the springs are vented to ambient to enhance linearity and efficiency.
REFERENCES:
patent: 3834046 (1974-09-01), Fowler
patent: 4267648 (1981-05-01), Weisz
patent: 4283864 (1981-08-01), Lipfert
patent: 4451994 (1984-06-01), Fowler
patent: 4494322 (1985-01-01), Klagmann
patent: 4521979 (1985-06-01), Blaser
patent: 4535553 (1985-08-01), Derderian et al.
patent: 4608768 (1986-09-01), Cavanagh
patent: 4616431 (1986-10-01), Dassler
patent: 4656760 (1987-04-01), Tonkel et al.
Colonel Richard C.
Lindh Devere
Jenny Robert W.
Watkins Donald
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