Mechanical device for use particularly for the synchronous movem

Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat

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297300, A47C 300

Patent

active

053483715

ABSTRACT:
A mechanical device connectable to the upper end of a central column extending from a chair base for the synchronous movement and locking of the seat and backrest of a chair. The device includes a first bracket connected to the column. A second bracket for connection to the seat is pivotally connected to the first bracket by a first axis. A third bracket for connection to the backrest is pivotally connected to the second bracket. A third axis is connected to the first bracket and extends through slots in the third bracket for limiting the rotation thereof. A fourth axis is connected to the second bracket and is connected to the third axis by a plurality of slotted disks. The third axis is operative to selectively lock the disks in a stationary position to prevent pivotal movement of the second and third brackets.

REFERENCES:
patent: 4629249 (1986-12-01), Yamaguchi
patent: 4743065 (1988-05-01), Meiller et al.
patent: 4747640 (1988-05-01), Locher
patent: 4986601 (1991-01-01), Inoue

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