Apparatus for preventing the tilting of telescopic jib cranes

Details Apparatus for preventing the tilting of telescopic jib cranes Apparatus for preventing the tilting of telescopic jib cranes

1974-12-19

1976-10-26

Spar, Robert J.

Traversing hoists

Overhead

Cable

340267C, 212 55, 212 46R, B66C 1348, G08B 2100

Patent

active

039879062

ABSTRACT:
Apparatus for preventing the tilting of a telescopic jib crane wherein a hydraulic cylinder is provided for raising the jib. The apparatus includes switches for monitoring the cylinder pressure and the elevation of telescopic position of the jib. Preselected ranges of cylinder pressure are permitted corresponding to predetermined jib elevations and telescopic positions. Above these limits, operations of the crane which would increase the tilting moment are terminated.

REFERENCES:
patent: 3371800 (1968-03-01), Grove
patent: 3641551 (1972-02-01), Sterner et al.
patent: 3680714 (1972-08-01), Holmes
patent: 3833932 (1974-09-01), Hamilton
patent: 3841493 (1974-10-01), Jackson et al.
patent: 3870160 (1975-03-01), Hutchings

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