Boom warning actuator

Details Boom warning actuator Boom warning actuator

1983-12-12

1985-08-20

Blix, Trygve M.

Traversing hoists

With haul-in line

212152, 254269, B66D 156

Patent

active

045358990

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 occurrence of such dangerous condition.

REFERENCES:
patent: 1743758 (1930-01-01), Cobb
patent: 2376019 (1945-05-01), Thomas
patent: 2524142 (1950-10-01), Seeloff
patent: 2529193 (1950-11-01), Rueter
patent: 3279748 (1966-10-01), Coulter
patent: 3924752 (1975-12-01), Hoofnagle

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