Adjustable backrest

Details Adjustable backrest Adjustable backrest

1988-02-11

1989-03-07

McCall, James T.

Chairs and seats

Bottom or back with means to alter contour

297460, A47C 300, A47C 702

Patent

active

048100331

ABSTRACT:
Disclosed is an adjustable chair backrest having a frame and deformable material covering one side of the frame. A pressure having a rigid lower portion and an elastically deformable upper portion is mounted on a cam. The plate and cam pivot about an axis in response to rotation of a spindle to cause outward movement of the deformable material.

REFERENCES:
patent: 3720441 (1973-03-01), Corchran
patent: 4182533 (1980-01-01), Arndt
patent: 4295681 (1981-10-01), Gregory
patent: 4313637 (1982-02-01), Barley
patent: 4541670 (1985-09-01), Morgenstern et al.

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