Lumbar support device

Details Lumbar support device Lumbar support device

1994-03-11

1995-06-13

Cranmer, Laurie K.

Chairs and seats

Bottom or back with means to alter contour

Providing support for lower back region

2972848, A47C 702

Patent

active

054235936

ABSTRACT:
A lumbar support device for an automotive seat, which comprises a drive mechanism, a crank-like rod operatively connected to the drive mechanism, an elastic synthetic resin support plate, the upper part of which is movably secured to a seat back frame within a seat back of the seat, and a lumbar support portion defined in the lower part of the support plate. The lumbar support portion is formed in a cambered or forwardly curved shape. A forward and backward displacement of the support plate may be ajustably effected by the drive mechanism and crank-like rod to apply a pressure against the lumbar support area of foam cushion member of the seat back, and because of integral formation of both support plate and lumbar support portion, a gradual pressure gradient or distribution may be attained in the seat back cushion member, without creating a local non-pressure or extremely soft spot therein.

REFERENCES:
patent: 4880271 (1989-11-01), Graves
patent: 5044693 (1991-09-01), Yokota
patent: 5076643 (1991-12-01), Colasanti et al.
patent: 5174526 (1992-12-01), Kanigowski
patent: 5197780 (1993-03-01), Coughlin
patent: 5217278 (1993-06-01), Harrison et al.
patent: 5318341 (1994-06-01), Griswold et al.

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