Overhoist prevention system
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United States of America Patent
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-
Mar 6, 1990
Issued Date -
N/A
app pub date -
Apr 4, 1989
filing date -
Oct 15, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An overhoist prevention system suitable for use on a crane comprises (a) a proximity switch (17), (b) a movable detector plate (10) normally biassed away from the proximity switch, (c) an actuator (5) adapted for use with the hoist wire (4) for moving the detector plate towards the proximity switch and (d) a relay (21). The relay is actuated by a signal from the proximity switch and controls the operation of an alarm and/or the supply of the power to the winding drum of the crane.
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