Lumbar support for a backrest

Details Lumbar support for a backrest Lumbar support for a backrest

1983-05-25

1986-03-18

Lyddane, William E.

Chairs and seats

Bottom or back with means to alter contour

297361, A47C 336

Patent

active

045764107

ABSTRACT:
Changes in the vertical inclination of a lumbar support plate pivotally mounted within a backrest cause different portions of the convex surface of the support plate to contact the back of the lumbar region of the backrest, vertically altering the site of support afforded by the plate. A cable transmits motion of user controls mounted on the outside of the backrest into incremental or continuous rotation of a circular cam. Cam followers on the rear of the support plate translate cam rotation into changes in support plate inclination. The disclosed mechanism is employable simultaneously with controls for rendering the support plate adjustable also in the horizontal direction.

REFERENCES:
patent: 1004476 (1911-09-01), Schultz
patent: 1182881 (1916-05-01), Frye
patent: 3018992 (1962-01-01), Lore
patent: 4040661 (1977-08-01), Hogan
patent: 4162807 (1979-07-01), Yoshimura
patent: 4295681 (1981-10-01), Gregory
patent: 4313637 (1982-02-01), Barley

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