Crane having overload release means

Details Crane having overload release means Crane having overload release means

1977-09-22

1978-08-29

Sheridan, Robert G.

Traversing hoists

Overhead

Cable

212 58R, 254173R, B66C 1348

Patent

active

041097980

ABSTRACT:
A crane having a hoist winch with a hoist cable connected to a link which parts at a predetermined tension, and a jib over which the hoist cable is reeved for connection to a load. A derricking system on the crane includes a derricking winch and a derricking cable for luffing the jib. It also includes an hydraulic ram connected to one or more preloaded hydropneumatic accumulators in which the gas pressure is set to cause the ram to react against a predetermined overload. The hoist winch is released by mechanism responsive to movement of the ram, due to exceeding said predetermined overload, so that the hoist winch, when released, pays out the hoist cable to enable parting of the link.

REFERENCES:
patent: 2013690 (1935-09-01), Lamond
patent: 3123223 (1964-03-01), Markwardt et al.

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