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US 5,120,023 AGranted
Hoist winding system
AssigneeKabushiki Kaisha Toshiba
InventorYoshihiko Kawabata
Life of this patent
Estimating the term…
Abstract
A shaft winding or winch system for raising and lowering a load attached to one end of a rope. The system includes a brake unit for braking a drum, a detection unit for detecting the length of the rope, and a control unit for controlling the brake unit according to the detected extended length of the rope and the torque generated by the drive unit.
Claims12
A winch system using a rope with a load attachably connected to one end for raising and lowering the load, comprising:
- means for carrying the rope;
- drive means for developing torque to drive the carrying means to raise and lower the load;
- brake means for braking the carrying means for carrying said rope;
- detection means for detecting a distance from a reference point to the load end of the rope;
- and
- control means for controlling the brake means according to the detected distance and the torque generated by the drive means.
3 more elements
A method of raising and lowering a load attachably connected to a rope which is frictionally carried on a drum, comprising the steps of
- driving the drum to raise the load;
- braking the drum;
- detecting the extended length of the rope when a load is attached;
- and
- controlling the braking of the drum according to the detected extended length of the rope and the torque generated by the driving operation.
2 more elements
Dependencies are inferred from the claim text.