Winch drive and braking mechanism
First Claim
1. A winch having a drum, means for driving the drum, said drive means having a controllable clutch and a brake, the improvement comprising:
- a drive train connecting a power supply to the drum, said drive train includinga rotatable drive shaft,a controllable clutch on one end of said drive shaft for selectively rotating said drive shaft in a hoist direction,an automatic one-way clutch on said drive shaft for allowing rotation of said drive shaft in said hoist direction but locking the drive shaft against movement in the opposite lowering direction,a controllable brake on said rotatable drive shaft coupling the drive shaft to the drive train downstream of the drive shaft and wherein said brake is an integral driving part of the drive train during hoisting of a load, andcontrol means for selectively, alternately (1) actuating the controllable clutch to rotate the drive shaft for hoisting a load using the brake or (2) releasing the brake for releasably allowing restricted movement of the drive train downstream of the drive shaft relative to the drive shaft with the drive shaft locked by the one-way clutch for lowering a load.
1 Assignment
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Accused Products
Abstract
A drive train for a winch from a continuously rotating input source to an intermittently rotated drum in which the drive train is through a clutch, then to a shaft, then through a continuously driven internal brake which forms a part of the drive train from the shaft, then to the drive train to the drum, with the shaft being provided with a one-way clutch so that the brake automatically is engaged for lowering the load by reversing the drum. A free-spool circuit is provided which can be operated only in the brake release position for safety and is operated off the brake release hydraulic control fluid pressure. A static or manual pump control fluid circuit is provided for operating the clutch, brake and/or free spool. A combination driving clutch and drag clutch are energized by opposite directional movement of a single piston for coupling an input to an output or stopping movement of the output.
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Citations
11 Claims
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1. A winch having a drum, means for driving the drum, said drive means having a controllable clutch and a brake, the improvement comprising:
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a drive train connecting a power supply to the drum, said drive train including a rotatable drive shaft, a controllable clutch on one end of said drive shaft for selectively rotating said drive shaft in a hoist direction, an automatic one-way clutch on said drive shaft for allowing rotation of said drive shaft in said hoist direction but locking the drive shaft against movement in the opposite lowering direction, a controllable brake on said rotatable drive shaft coupling the drive shaft to the drive train downstream of the drive shaft and wherein said brake is an integral driving part of the drive train during hoisting of a load, and control means for selectively, alternately (1) actuating the controllable clutch to rotate the drive shaft for hoisting a load using the brake or (2) releasing the brake for releasably allowing restricted movement of the drive train downstream of the drive shaft relative to the drive shaft with the drive shaft locked by the one-way clutch for lowering a load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A winch having a drum, power means for driving said drum, a clutch, brake and free-spool release, and control means for remotely operating said clutch, brake and free-spool release at an operator'"'"'s station, comprising:
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a drive train connecting a power supply to the drum, a remotely controlled clutch for disconnecting the power supply, said drive train including an automatic one-way clutch for allowing rotation of the drive train in a hoist direction but locking the drive train against rotation in the reverse lower direction, a brake in said drive train, said brake being an integral part of said drive train for transmitting power from said supply to said drum, said brake being located in an upper stage of said drive train for providing downstream drag on said drum when said brake is decoupled, means for releasing said brake to permit movement of the drive train downstream of the brake and thus lowering rotational movement of the drum, a free-spool decoupling device located in the drive train close to said drum and downstream of said brake for releasing said drum for free rotation, and manually operated control means for actuating said clutch, brake and free-spool decoupling means. - View Dependent Claims (11)
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Specification