Adjustable chair backrest

Details Adjustable chair backrest Adjustable chair backrest

2008-03-25

2008-03-25

Brown, Peter R. (Department: 3636)

Chairs and seats

Movable back

Horizontally

C297S354110, C297S301700

Reexamination Certificate

active

07347496

ABSTRACT:
A chair backrest adjusting mechanism includes a seat supporting frame, a backrest supporting arm, amount, a supporting arm cover, and a ball-shaped handle. The seat supporting frame is fixedly connected at a lower end to a base below a chair seat, and pivotally connected at an upper end to two pivot brackets at a lower end of the backrest supporting arm, which is further pivotally connected at an upper end to the mount on a rear side of a chair backrest. The supporting arm cover is fitly covered on the backrest supporting arm with upper and lower ends pivotally connected to the mount and the upper end of the seat supporting frame. A threaded rod is fixedly mounted in and turned via the ball-shaped handle to drive the backrest supporting arm to tilt forward or backward, and accordingly adjust the backrest to different positions relative to the chair seat.

REFERENCES:
patent: 2272980 (1942-02-01), McLellan et al.
patent: 2338511 (1944-01-01), Harman
patent: 2692012 (1954-10-01), Cramer
patent: 4655503 (1987-04-01), Kamijo et al.
patent: 5288130 (1994-02-01), Foster
patent: 5931531 (1999-08-01), Assmann
patent: 7234768 (2007-06-01), Manning
patent: 7261368 (2007-08-01), Clausnitzer

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