Seat backrest having an adjustable lumbar support

Details Seat backrest having an adjustable lumbar support Seat backrest having an adjustable lumbar support

1981-05-26

1984-05-22

Zugel, Francis K.

Chairs and seats

Bottom or back with means to alter contour

A47C 300, A47C 746

Patent

active

044497512

ABSTRACT:
A seat backrest having an adjustable lumbar support is provided wherein the cam surface of a rotatable cam of a regulating mechanism, which adjusts the lumbar support, is effectively utilized to facilitate manual adjustment of the lumbar support. Rotation of the cam in a first direction cams a follower away from the axis of rotation of the cam. The follower causes an attached bar to rotate therewith. A lumbar support plate is supported by a cantilevered resilient or rigid element in the form of a leaf spring which is supported by the bar.

REFERENCES:
patent: 2139028 (1938-12-01), Mensendicck
patent: 3807794 (1974-04-01), Beyer
patent: 4148522 (1979-04-01), Sakurada et al.
patent: 4162807 (1979-07-01), Yoshimura
patent: 4296965 (1981-10-01), Sakurada et al.

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