Hoisting apparatus
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United States of America Patent
Stats
-
Sep 9, 1980
Grant Date -
N/A
app pub date -
Jun 19, 1978
filing date -
Jun 19, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hoisting apparatus and a control circuit therefor comprising a reversible electric motor drivingly connected to a hoisting drum for hauling an object up and down. The control circuit includes first and second photosensitive elements each responsive to a light beam for initiating rotation of the electric motor in either direction and means for terminating rotation of the electric motor.
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