Position maintenance device for the shaft of a hydraulic cylinde

Details Position maintenance device for the shaft of a hydraulic cylinde Position maintenance device for the shaft of a hydraulic cylinde

1997-11-07

1999-06-22

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60426, 60462, F16D 3102

Patent

active

059138106

ABSTRACT:
The maintenance device consists of a hydraulic insulation unit (2) mounted between the supply circuits of a cylinder (1). The insulation unit (2) comprises a sluice (9) which has, at each of its two openings, an anti-return valve, one of which, the primary valve (11) is hydraulically connected to the outlet chamber (6) of the shaft (7) of the cylinder (1) and opens toward said chamber; and a safety valve (13) opening in the same direction, with the latter valve closing at a different rate than the primary valve closes. The invention is useful for maintaining the shaft of any cylinder in position, particularly a charged cylinder, and it is of interest to manufacturers of hydraulic devices, particularly lifting cylinders, as well as those who use them.

REFERENCES:
patent: 2702044 (1955-02-01), Johnston
patent: 2797550 (1957-07-01), Stelzer
patent: 3381587 (1968-05-01), Parquet
patent: 4355565 (1982-10-01), Bianchetta
patent: 4913190 (1990-04-01), Kugler
patent: 5261456 (1993-11-01), Patton et al.

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