Seat having an adjustable back support arrangement

Details Seat having an adjustable back support arrangement Seat having an adjustable back support arrangement

1984-01-06

1986-07-22

Lyddane, William E.

Chairs and seats

Bottom or back with means to alter contour

297460, A47C 746

Patent

active

046015140

ABSTRACT:
The seat has a backrest with a back support integrated therein, comprising a curved spring plate member which bears against the rear of the backrest cushion. The distance, as measured in the heightwise direction of the backrest, between the upper and lower edges of the spring plate member can be adjusted by manual or motor-driven means to vary its curvature and the resistance to bending of the spring plate member is lower in its lower region than in its upper region whereby, when the distance between its upper and lower edges is progressively reduced, the spring plate member initially becomes more curved in its lower region until a restricting means comes into action to limit that initially produced increase in curvature, with the result that the curvature in the upper region is then increased.

REFERENCES:
patent: 2053852 (1936-09-01), Tracy
patent: 2608239 (1952-08-01), Gordon
patent: 2756809 (1956-07-01), Endresen
patent: 2942651 (1960-06-01), Binding
patent: 3147038 (1964-09-01), Barabas
patent: 3288525 (1966-11-01), Cerf
patent: 3446532 (1969-05-01), Cramer
patent: 3565482 (1971-02-01), Blodee
patent: 3628528 (1971-12-01), Roberts
patent: 3877750 (1975-04-01), Scholpp
patent: 4153293 (1979-05-01), Sheldon
patent: 4316631 (1982-02-01), Lenz et al.
patent: 4425910 (1984-01-01), Meiller

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