Hydraulic priority circuit

Details Hydraulic priority circuit Hydraulic priority circuit

1977-07-05

1979-03-20

Pekar, John A.

Motor vehicles

Surface effect vehicles

Dynamic seal or fluid curtain

60422, 60DIG2, B62D 500

Patent

active

041449460

ABSTRACT:
A hydraulic priority circuit for a fork lift truck having a primary work system for providing power steering and a secondary work system for raising a fork along a mast and for tilting the mast. A variable speed electric motor drives a variable output pump to supply pressurized fluid which is divided by a flow divider into two streams leading to the primary and secondary work systems, respectively. A priority solenoid valve is controlled by a device which detects preselected conditions of the truck to direct all the fluid in the stream leading to the primary work system either to the primary work system when the truck is in drive or is rolling, or to the secondary work system when the truck is in neutral and stationary.

REFERENCES:
patent: 3463187 (1969-08-01), Rue
patent: 3568868 (1971-03-01), Chichester
patent: 3697384 (1972-10-01), Walker
patent: 3875747 (1975-04-01), Briggs
patent: 4002220 (1977-01-01), Wible

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