Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1984-06-27
1985-05-21
Taylor, Billy S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
74423, 188166, 188170, 254342, 254378, B66D 148, B66D 154, B66D 520
Patent
active
045181535
ABSTRACT:
The safety system in a hoist having a motor with a motor shaft, a gear reduction unit, 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 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 and is easily reset remotely after the brake has been set.
REFERENCES:
patent: 2250985 (1941-07-01), Benson
patent: 2356762 (1944-08-01), Kalix
patent: 2950086 (1960-08-01), Abraham
patent: 3102434 (1963-09-01), Cramer, Jr.
patent: 3753552 (1973-09-01), Barron
patent: 3917230 (1975-11-01), Barron
patent: 4023655 (1977-05-01), Anzai et al.
patent: 4175727 (1979-11-01), Clarke
patent: 4177973 (1979-12-01), Miller
Clark, Jr. Charles W.
Johnson Roger A.
West Harold H.
Ederer Incorporated
Taylor Billy S.
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