Mechanical device for use particularly for the synchronous movement of the seat and backrest of a chair
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United States of America Patent
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Sep 20, 1994
Issued Date -
N/A
app pub date -
May 19, 1993
filing date -
Dec 14, 1989
priority date (Note) -
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status (Latency Note)
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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.
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