Load compensating device, especially for lifting appliance
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United States of America Patent
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Aug 24, 2010
Grant Date -
Nov 29, 2007
app pub date -
Apr 10, 2007
filing date -
Apr 25, 2006
priority date (Note) -
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Abstract
A load compensating device, especially one for lifting appliances, includes a detector for detecting an overload or an underload and designed to cause actuation of the compensating device. The device comprises an actuator attached to one of ends of a rope or ropes that support the load for producing positive or negative displacement of the rope or ropes over a short distance compared with the length of the rope or ropes. The actuator is operated by a brushless electric motor connected to an infinitely variable-speed transmission. The transmission is connected to the detector.
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