Back support with controllable firmness

Details Back support with controllable firmness Back support with controllable firmness

1977-07-15

1978-11-07

Mitchell, James C.

Chairs and seats

Bottom or back

Framework

5DIG2, 297284, A47C 702

Patent

active

041242521

ABSTRACT:
A back support comprising a pad of resilient, compressible material having a supporting face for engagement by the back of a person, and apparatus for controllably compressing the pad parallel to the supporting face, comprising a shaft passing parallel to the supporting face and having left hand and right hand threads with threaded followers on the shaft anchored to the pad at spaced points.

REFERENCES:
patent: 2874390 (1959-02-01), Stone
patent: 3085259 (1963-04-01), Sandor
patent: 3095188 (1963-06-01), Giese
patent: 3241879 (1966-03-01), Castello et al.
patent: 3490084 (1970-01-01), Schuster

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