Automatic braking arrangement for a windlass
OwnerJan van Gennepinventor
Life of this patent
Estimating the term…
Abstract
A hoist is described which includes a windlass for taking up and paying out a line which operates a block and tackle. The windlass is provided with a brake which is arranged to operate automatically to prevent unwanted paying out of the block and tackle line whenever a load is on the block and tackle. The brake operating mechanism includes a load sensing lever arm mounted for limited pivotal movement in response to a load being on the block and tackle, and linkage connecting such lever arm with a brake actuator for transmitting its motion to the actuator. The actuator is adapted to respond to such motion by applying the brake on the windlass to prevent its rotation in response to the force of the load.
Claims14
A braking arrangement for automatically operating a brake on a windlass to prevent unwanted reverse rotation of said windlass, comprising load sensing means for indicating the presence of said windlass of any load tending to cause rotation thereof in the reverse direction irrespective of said windless rotating in either a forward or reverse direction, frictional brake means for controlling rotation of said windlass, brake operating means automatically responsive to said load sensing means indicating the presence of any such load on said windlass by applying said frictional brake to prevent said reverse rotation, means for applying against the pressure of said brake sufficient reverse rotational force to said windlass to overcome the resistance of said brake pressure to reverse rotation, and means for rendering said brake operating means substantially ineffective in response to sufficient forward rotational force being applied to said windlass to rotate the same in a forward direction in opposition to the reverse rotational force applied by said load.
A hoist or the like comprising a windlass which is selectively rotatable in forward and reverse directions respectively to take in or pay out a line to which a load to be moved is securable;
- a housing for said windlass which remains stationary with respect thereto upon rotation of said windlass;
- and a brake arrangement for automatically operating a frictional brake on said windlass to prevent unwanted reverse rotation of the same in response to a load tending to cause such reverse rotation comprising load sensing means to which said load is applied and which is mounted on said housing for movement upon any load tending to cause such reverse rotation being applied thereto irrespective of said windless rotating in either a forward or reverse direction, a lever arm actuator for said brake, linkage connecting said load sensing means to said brake actuator for transmitting the motion of said load sensing means to said actuator to apply said frictional brake to prevent reverse rotation of said windlass, and means for applying against the pressure of said frictional brake sufficient reverse rotational force to said windlass to overcome the resistance of said brake pressure to reverse rotation.
Dependencies are inferred from the claim text.