Back support construction

Details Back support construction Back support construction

1980-05-05

1982-07-13

Lawson, Patrick D.

Chairs and seats

Bottom or back with means to alter contour

297460, A47C 300, A47C 702

Patent

active

043391508

ABSTRACT:
A back support construction including a base, upper and lower back support plates of extended surface area, mechanical linkages for positively bodily moving each of the upper and lower back support plates in their entireties independently of each other toward and away from the base while each maintains parallelism with the base, knobs extending laterally from the base for actuating the mechanical linkages, and padding on the upper and lower plates.

REFERENCES:
patent: 2756809 (1956-07-01), Endresen
patent: 3608960 (1971-09-01), Sherman
patent: 3880463 (1975-04-01), Shephard et al.
patent: 3973797 (1976-08-01), Obermeier et al.
patent: 4108492 (1976-08-01), Kerby
patent: 4124252 (1978-11-01), Sabir
patent: 4153293 (1979-05-01), Sheldon

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