Title: Hydraulic circuit for a pipelayer

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.

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Inventors: Vinton, David S. (Morton, IL, US)

Application Number: 454107
Filing Date: 1974-03-25
Publication_date: 1976-02-17
Assignee: Caterpillar Tractor Co. (Peoria, IL)
Primary Class(es): 212/272 212/195, 212/196, 212/287, 414/719
Other Classes:
US Patent Ref:

3265218	Aug, 1966	Stefanutti	212/35.
3300060	Jan, 1967	Lado	212/55.
3542228	Nov, 1970	Horsch	214/762.
3606049	Sep, 1971	Gordon	214/762.
3614273	Oct, 1971	Wallace	214/762.
3641876	Feb, 1972	Wienke	91/413.
3747472	Jul, 1973	Knutson	91/413.

Other Refs: 622,564360,458

Sep, 1962	BE
Nov, 1931	UK

Primary Examiner: Goodman, Philip
Assistant Examiner: Forman, Michael J.
Attorney: Phillips, Moore, Weissenberger Lempio & Strabala