Lumbar support device

Details Lumbar support device Lumbar support device

1985-03-22

1986-01-21

Zugel, Francis K.

Chairs and seats

Bottom or back with means to alter contour

297460, A47C 746

Patent

active

045654069

ABSTRACT:
A lumbar support device is disclosed in which a cam is rotated to longitudinally move an elastic member extending across the right and left sides of a back frame and thus vary the curvature of the elastic member in its longitudinal direction so as to be able to adjust the hardness of the lumbar support portion of a seat back forming part of a vehicle seat. The cam comprises a smaller cam portion mounted at the side of the elastic member to a shaft and a larger cam portion engaged coaxially and integrally with the smaller cam portion and provided at its side facing the smaller cam portion with a guide section having a concavo-convex curved surface with respect to the elastic member. The elastic member is pushed out in accordance with both displacements of the smaller cam portion and the guide section in the larger cam portion so that the curvature of the elastic member is varied accordingly.

REFERENCES:
patent: 3241879 (1966-03-01), Costello et al.
patent: 4019777 (1977-04-01), Hayashi
patent: 4162807 (1979-07-01), Yoshimura
patent: 4296965 (1981-10-01), Sakurada et al.
patent: 4449751 (1984-05-01), Murphy et al.

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