Crane with a pivoted boom and a float valve therefor

Details Crane with a pivoted boom and a float valve therefor Crane with a pivoted boom and a float valve therefor

1976-06-10

1977-08-02

Makay, Albert J.

Traversing hoists

Overhead

Cable

212 8R, 91420, 91464, B66G 2362

Patent

active

040390853

ABSTRACT:
A crane is disclosed having hydraulic means for boom elevation control which is provided with a load-holding check valve and a float valve interposed therebetween. The float valve is intentionally operable to a float position establishing fluid communication between opposed actuating chambers of the hydraulic means during crane transportation. The float valve includes a preferred position which does not interfere with conventional operation of combination of the hydraulic means and the load holding valve. The float valve is intentionally actuated to the float position by manually connecting a releasable coupling to a pilot pressure source. During crane operation, the releasable coupling is connected to a discharge hydraulic circuit that disables the float valve to prevent its inadvertent operation. The float valve is operable during crane transportation to allow the boom to move vertically in response to perturbations of a boom supporting dolly.

REFERENCES:
patent: 3083837 (1963-04-01), Jones et al.
patent: 3426916 (1969-02-01), Novotny
patent: 3613508 (1971-10-01), Krehbiel
patent: 3908515 (1975-09-01), Johnson
patent: 3924656 (1975-12-01), Hanser et al.

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