Chair back height-adjustment mechanism
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United States of America Patent
Stats
-
Apr 1, 2003
Grant Date -
N/A
app pub date -
Mar 1, 2001
filing date -
Mar 1, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mechanism for adjusting the height of a chair back relative to the seat includes an arm that extends upwardly from the rear of the seat, and a carriage that is carried by the back and slidably mounted on the arm. A pinion inside the carriage engages a rack on the arm so that the pinion travels along the rack when the chair back is moved up and down on the arm. A pawl engages the pinion when the chair back is moved upwardly so as to allow incremental adjustment in the height of the back in the upward direction, while preventing downward movement of the back. When the back reaches the upper limit of its travel, an actuator spring is displaced downwardly, disengaging the pawl so that the back is free to slide on the arm. At the bottom of the limit of travel, the spring is displaced upwardly, re-engaging the pawl.
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