Safety mechanism for hoisting drums

Details Safety mechanism for hoisting drums Safety mechanism for hoisting drums

B - Operations, Transporting

66

D

254/89

B66D 5/02 (2006.01) B66D 1/58 (2006.01) B66D 5/24 (2006.01)

Patent

CA 1171069

SAFETY MECHANISM FOR HOISTING DRUMS Abstract The safety system in a hoist having a motor with a motor shaft, a power transmission main drive, a drum, a safety brake drivingly coupled on an operating element on or close to the drum in which a mechanical out-of-sync detector produces a bidirectional or, preferably, a unidirectional brake-setting output from inputs from the drum and the motor shaft,the unidirectional brake-setting rotational output for setting the brake. In a preferred embodiment, an error correction is made into the detector for obtaining a first unidirectional output during normal operation, and the brake-setting unidirectional rotation is in the opposite direction for setting the brake. One form of detector is a mechanical differential assembly and another form of detector is a set of coaxial shafts that measure differential rotation between the drum and motor input shafts. A unique brake actuator is provided which uses a large spring force which is controlled by a trigger mechanism and is easily reset remotely after the brake has been set.

389485

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