Hydraulically-operated support device for semitrailers

Details Hydraulically-operated support device for semitrailers Hydraulically-operated support device for semitrailers

1989-02-13

1990-05-29

Look, Edward K.

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

60484, 60486, 91167R, 91216R, 91525, 91535, 254 93VA, 280475, 2807661, F16D 3102

Patent

active

049284886

ABSTRACT:
A hydraulically-operated support device for semitrailers is disclosed comprising a hydraulic cylinder semitrailer support and a pump subassembly having three independently operable pumps for generating and controlling the hydraulic operating pressure. The hydraulic cylinder semitrailer support has an extending piston in an extending cylinder, in the bottom end of which is formed a load-raising cylinder for a load raising-piston. A first annular space is formed between the extending piston and the extending cylinder and a second annular space is formed between the load-raising piston and the load-raising cylinder. The annular spaces allow application of pressure in the retraction direction. The pump subassembly comprises an extending pump acting on the extending piston, a load-raising pump acting on the load-raising piston and a retracting pump acting on the annular spaces. The transmission ratio between the load-raising pump and the load-raising piston is substantially lower than the transmission ratio between the extending pump and the extending piston.

REFERENCES:
patent: 1130884 (1915-03-01), Blakey et al.
patent: 2453350 (1948-11-01), Stegeman
patent: 3610100 (1971-10-01), Hoffman
patent: 3672159 (1972-06-01), Sundin
patent: 3945300 (1976-03-01), Bourges
patent: 4210061 (1980-07-01), Bianchetta

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