Lumbar support device

Chairs and seats – Bottom or back with means to alter contour – Providing support for lower back region

Patent

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Details

2972844, A47C 300

Patent

active

054660459

ABSTRACT:
A lumbar support device for seat which is of such a structure wherein a lumbar plate is supported on the free end portion of an arm, and wherein the arm is operatively connected, at its base end portion, with a threaded drive mechanism via a guide element, while the intermediate portion of the arm is in a slidable contact with a fulcrum or support rod. The guide element comprises a generally arcuate guide hole formed in conformity with a locus along which the base end portion of the arm has to be displaced in order for the free end portion thereof to be moved on a straight line. Such slidable contact between the arm's intermediate portion and support rod, and provision of generally arcuate guide hole, materializes a linear movement of the lumbar plate on the same straight line in the fore-and-aft direction of the seat. Thus, the lumbar plate is prevented against dislocation in the width-wise direction of the seat, offering a stable support touch to the lumbar part of an occupant on the seat.

REFERENCES:
patent: 4576410 (1986-03-01), Hattori
patent: 4714291 (1987-12-01), Hattori et al.
patent: 5011223 (1991-04-01), Kato
patent: 5078449 (1992-01-01), Suzuki
patent: 5215350 (1993-03-01), Kato
patent: 5314236 (1994-05-01), Suzuki et al.

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