Self-camming pulley
AssigneeCMC Rescue, Inc.
InventorKirk M. Mauthner
Life of this patent
Estimating the term…
Abstract
A pulley is provided having a first plate and a second plate arranged adjacent to the first plate and connected to the first plate by an axle. An eccentrically mounted sheave is located between the first plate and the second plate and is adapted to freewheel in one direction only. The eccentrically mounted sheave is mounted eccentrically with respect to the axle. A fixed block is mounted between the first plate and the second plate and is adapted to fixedly lock a line between the fixed block and the eccentrically mounted sheave.
Claims20
A pulley comprising:
- a first plate;
- a second plate arranged adjacent to the first plate and connected to the first plate by an axle;
- an eccentrically mounted sheave located between the first plate and the second plate and adapted to freewheel in one direction only, the eccentrically mounted sheave being mounted eccentrically with respect to the axle and adapted to support a line;
- and
- a fixed block mounted between the first plate and the second plate and adapted to fixedly lock a line between the fixed block and the eccentrically mounted sheave.
A pulley comprising:
- a front plate;
- a middle plate arranged adjacent to the front plate, the middle plate having an eye located at a bottom portion;
- a rear plate arranged parallel to the front plate and the middle plate;
- an axle connecting the front plate, the middle plate, and the rear plate together in a center portion of the front plate, the middle plate, and the rear plate;
- a main block connecting the front plate, the middle plate, and the rear plate together at an upper portion;
- a first sheave located between the front plate and the middle plate, the first sheave being mounted eccentrically with respect to the axle, the first sheave being adapted to freewheel in one direction only;
- a second sheave located between the middle plate and the rear plate, the second sheave being adapted to rotate in both a clockwise and counter-clockwise direction;
- a eyebolt attached to a top of the main block and adapted to swivel;
- a fixed block attached between the front plate and the middle plate, the fixed block being adapted to fixedly lock a line between the fixed block and the first sheave;
- and
- a lever coupled to the first sheave.
A method of providing a self-locking system on a pulley having a first plate and a second plate, the method comprising:
- locating a fixed block between the first plate and the second plate;
- mounting a sheave eccentrically with respect to an axle between the first plate and the second plate such that in a first eccentric position the sheave is closer to the fixed block and in a second eccentric position the sheave is farther from the fixed block;
- adapting the sheave such that it freewheels in one direction only;
- adapting the sheave to rotate to the first eccentric position when force on a line carried by the sheave is released;
- adapting the sheave and the fixed block to fixedly lock a line between the fixed block and the sheave when the sheave is in the first eccentric position;
- and
- adapting the sheave to rotate to the second eccentric position when force on a line carried by the sheave is applied such that the line is released from between the fixed block and the sheave.
Dependencies are inferred from the claim text.