Concentric ring segment supported lift crane

Details Concentric ring segment supported lift crane Concentric ring segment supported lift crane

1980-03-07

1982-02-23

Saifer, Robert W.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

B66C 2376

Patent

active

043165486

ABSTRACT:
Front and rear pairs of crawler assemblies are provided for supporting concentric ring segments disposed forwardly under the boom and rearwardly under the counterweight so the crane can travel under load and swing through at least a partial horizontal arc. One and preferably both crawler assemblies are selectively and reversely powered to facilitate forward and reverse as well as turning movement during travel under loaded and unloaded conditions.

REFERENCES:
patent: 3836010 (1974-09-01), Lampson
patent: 3930583 (1976-01-01), Jouffray
patent: 4258852 (1981-03-01), Juergens

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