Traversing hoists – Overhead – Cable
Patent
1975-07-07
1977-07-05
Paperner, L. J.
Traversing hoists
Overhead
Cable
91411R, 212 8R, 212 59R, B66C 2300
Patent
active
040334686
ABSTRACT:
Greater overall speed of crane operation is made possible by using a plurality of hydraulic piston-cylinder sets together with valving which can direct the pumped hydraulic fluid selectively to either of the cylinder sets or to both of them. Preferably the two cylinder sets are of different speed-load characteristics so that the same supply of pressured oil will raise the boom faster when supplied to one than when supplied to the other. When the boom must be raised with maximum load, the same oil supply will be directed to both cylinder sets, thereby giving the maximum lifting power with a given available oil pressure and the slowest raising speed. The overall time required to accomplish a given task is reduced because most of the time the boom can be raised or lowered at a faster speed than that slow speed which must be provided for handling heaviest loads. Speeds are selected by operating one or both of two handles to the up or down position, each handle controlling its own valve spool. When only one handle is moved to supply fluid under pressure, the other is moved to a "float" position. Each valve spool must therefore have a float position, but for safety an interlock prevents moving both spools to the float position simultaneously.
REFERENCES:
patent: 2916205 (1959-12-01), Litz
patent: 3120823 (1964-02-01), Flowers
patent: 3170379 (1965-02-01), Dempster
patent: 3530767 (1970-09-01), Shook
Paperner L. J.
Pettibone Corporation
Weaver Ross
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