Operating device for electric chain block
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Apr 17, 1990
Grant Date -
N/A
app pub date -
Aug 28, 1987
filing date -
Aug 29, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An operating device for an electric chain block having an electric motor for a raising and lowering operation comprises a cylinder body interposed between one end of a chain for raising and lowering an object and a hook for hanging the object, a cylindrical grip fitted on the cylinder body and slidable upwardly and downwardly over predetermined distances relative to the cylinder body. The device further comprises a movement detecting device provided in the cylinder body for detecting upward and downward movements of the cylindrical grip, a moved distance detecting device provided in the cylinder body for detecting distances of the upward and downward movements of the cylindrical grip, and control device for energizing the electric motor to rotate it in normal and reverse directions in response to output of the movement detecting devce according to the upward and downward movements of the cylindrical grip, respectively, and controlling rotating speeds of the electric motor in response to output of the moved distance detecting device. Changing the raising and lowering operations and controlling the speeds of the operations are effected by an operator in the same sense as the operator raises and lowers a heavy object by himself.
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