Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Pengfei Ma0
Shihan Zhang0
Date of Patent
June 14, 2011
0Patent Application Number
125530910
Date Filed
September 2, 2009
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A hoist positioning system includes an accelerometer attached to a hoist, a control unit for processing signals from the accelerometer and comparing the processed signals with reference data to determine a position of the hoist, a drive system for moving the hoist up and down, and a relay that is switched ON and OFF by a control signal from the control unit. When the relay is switched ON, power is supplied to the drive system from a high-voltage power source and the hoist is driven up or down. When the relay is switched OFF, power from the high-voltage power source to the drive system is cut off and the hoist stops moving up or down.
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