Chairs and seats – Bottom or back with means to alter contour
Patent
1988-07-11
1990-04-10
McCall, James T.
Chairs and seats
Bottom or back with means to alter contour
128 52, 297217, A47C 300
Patent
active
049154486
ABSTRACT:
An improved power driven lumbosacral backrest having a back engaging contour which is adjustable under power of manual operation to accommodate users' backs which vary widely in configuration and dimension. It has a contour defined by a spindle inserted between a foundation frame and resilient back support, the regulator spindle being adjustable along the back support and adapted to define a transverse plane of rigidity at the proper level and shape to provide comfortable support for the individual user's back. The backrest includes a pair of gear racks, a pair of gears and a series of rollers journaled to a shaft between the gears. A plurality of spaced apart flexible bands are trained over the rollers and gears.
REFERENCES:
patent: 4156544 (1979-05-01), Swenson et al.
patent: 4574786 (1986-03-01), Hashimoto et al.
patent: 4576149 (1986-03-01), Otuka et al.
patent: 4686967 (1987-08-01), Hashimoto et al.
patent: 4722569 (1988-02-01), Morgenstern et al.
McCall James T.
Osann, Jr. Edward W.
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