Safety device for cranes

Details Safety device for cranes Safety device for cranes

1975-12-29

1978-01-10

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 39B, 212132, 92133, 91358A, B66C 1348

Patent

active

040674479

ABSTRACT:
An anti-two block system adapted to be used with a crane having a sensor device mounted with the boom point of the crane in communication with a hoisting actuator mechanism such that the sensor device effects movement of the hoisting lever of the crane to discontinue the lifting force exerted on the lifting line when the travelling member engages the sensor device.

REFERENCES:
patent: 1834985 (1931-12-01), Stoner
patent: 2635627 (1953-04-01), McCarthy
patent: 2744637 (1956-05-01), Stewart
patent: 2955578 (1960-10-01), Flessate et al.
patent: 3035712 (1962-05-01), Nowack
patent: 3613520 (1971-10-01), Worden
patent: 3670628 (1972-06-01), Borer et al.
patent: 3924752 (1975-12-01), Hoffnagle
patent: 3929245 (1975-12-01), Inoue

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