Hydraulic circuit for a pipelayer

Details Hydraulic circuit for a pipelayer Hydraulic circuit for a pipelayer

1974-03-25

1976-02-17

Goodman, Philip

Traversing hoists

Overhead

Cable

214142, B66C 2300

Patent

active

039386694

ABSTRACT:
A pipelayer comprising a tractor vehicle having an extensible boom pivotally mounted to the vehicle and extended to one side thereof is provided with a hydraulic circuit for performing all operations of the boom and accessories. The hydraulic circuitry comprises a low volume source of fluid selectively directable to a first plurality of the motors of the machine for operating these motors at a low speed and a second source of fluid including circuits for selectively directing the fluid to a second plurality of motors including some of the first motors. Two motors within the circuit may be operated from either of the sources of fluid. Valve means are interconnected for simultaneous control for selectively directing fluid from either of the sources to the two motors.

REFERENCES:
patent: 3265218 (1966-08-01), Stefanutti
patent: 3300060 (1967-01-01), Lado
patent: 3542228 (1970-11-01), Horsch
patent: 3606049 (1971-09-01), Gordon
patent: 3614273 (1971-10-01), Wallace
patent: 3641876 (1972-02-01), Wienke
patent: 3747472 (1973-07-01), Knutson

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