Motors: expansible chamber type – Working member position responsive motive fluid control – Exhaust control
Patent
1978-08-23
1980-09-09
Maslousky, Paul E.
Motors: expansible chamber type
Working member position responsive motive fluid control
Exhaust control
91447, F15B 1522
Patent
active
042211565
ABSTRACT:
The hydraulic lifting device for harvesting machines includes a hydraulic cylinder-piston unit mounted on the wheel frame of the machine and supporting most of the weight of the harvesting apparatus so that the latter abuts against the ground with residual weight only. The cylinder-piston unit is controlled by a multi-way selector valve and a locking valve unit connected in a first working pipeline system. The hydraulic device further includes a pressure limiting valve for setting a reference pressure for the hydraulic cylinder-piston unit, the limiting valve being connected in an additional working pipeline that is branched upstream the limiting valve to a nonreturn valve and therefrom is connected by a direct conduit to a hydraulic accumulator and the hydraulic cylinder-piston unit. The combination of the pressure limiting valve with the non-return valve and the branch conduit prevents during the lowering of the piston-cylinder unit the hydraulic accumulator from being completely discharged, accelerates the lowering movement and improves the seal of the entire lifting device.
REFERENCES:
patent: 4051766 (1977-10-01), Strouff
patent: 4163412 (1979-08-01), Porter
Preun Hugo
Zirps Wilhelm
Maslousky Paul E.
Robert & Bosch GmbH
Striker Michael J.
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