Crane boom warning actuator

Details Crane boom warning actuator Crane boom warning actuator

1981-05-21

1984-01-10

Blix, Trygve M.

Traversing hoists

With haul-in line

212152, 254269, B66D 156

Patent

active

044249098

ABSTRACT:
A fluid pressure-activated warning system for a crane comprising a plurality of signal device actuators each further comprising a valve spool, shiftable in response to a dangerous condition, and adapted to permit the emission of an alarm on the occurrance of such dangerous condition.

REFERENCES:
patent: 1369147 (1921-02-01), Valls
patent: 1743758 (1930-01-01), Cobb
patent: 2840244 (1958-06-01), Thomas, Jr.
patent: 3814265 (1974-06-01), Miller
patent: 3924752 (1975-12-01), Hoofnagle
patent: 3969714 (1976-07-01), Greer
patent: 4131078 (1978-12-01), Morrow
patent: 4135632 (1979-01-01), Berkel
patent: 4170308 (1979-10-01), Rogers
patent: 4345539 (1982-08-01), Williams

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