Lumbar support device

Details Lumbar support device Lumbar support device

1991-03-15

1992-01-07

Cranmer, Laurie K.

Chairs and seats

Bottom or back with means to alter contour

297353, A47C 300

Patent

active

050784498

ABSTRACT:
An adjustable lumbar support device for a seat having a lumbar support panel arranged in the backrest of the seat. The lumbar support panel is movable in a forward direction and rearward direction by a spring member. The spring member has a base end portion in contact with the back of the lumbar support panel and terminal ends pivotably connected to a bracket mounted in the backrest of the seat. A threaded shaft axially displaces a holding bracket near the terminal ends of the spring member when the threaded shaft is rotated either manually or by an electric motor. The rotation of the threaded shaft axially displaces the holding bracket which pivots the spring member to move the lumbar support panel forwardly or rearwardly.

REFERENCES:
patent: 4636000 (1987-01-01), Nishino
patent: 4714291 (1987-12-01), Hattori et al.
patent: 4811986 (1989-03-01), Hattori et al.
patent: 4981321 (1991-01-01), Zacharkow
patent: 5011223 (1991-04-01), Kato

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