Anti-fail device for locking a drawing-board pillar against motion
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United States of America Patent
Stats
-
Aug 12, 1986
Grant Date -
N/A
app pub date -
Aug 16, 1984
filing date -
Sep 7, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Permanent locking mechanism can be released temporarily by depressing a pedal when adjusting the height and orientation of the drawing board. The movable assembly comprising the table supporting pillar is connected to the balancing system by a cable attached at one end to a spring passing around a return pulley having its axle supported by a strap of which the corresponding notch is directed towards the base of the frame structure, then around another return pulley formed with a helical groove and secured to the top of the frame structure, the other end of the cable being attached to the pillar. A locking member interconnects the axle and the pedal, this connection being discontinued in case of undesired slackening or breakage of the cable.
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