Draining of oil leak in a hydraulic cylinder
AssigneeNational Oilwell Norway AS
InventorMagne Mathias Moe
Life of this patent
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Abstract
A device for a single-acting hydraulic cylinder (1) designed to lift or pull a load upon the existence of an oil pressure on the rod-side of a cylinder piston (7), where the cylinder bottom (15) of the hydraulic cylinder (1) is provided with a drainage outlet (27) for leakage fluid, as well as an air inlet (29).
Claims16
A device for a single-acting hydraulic cylinder designed to lift or pull a load upon the existence of an oil pressure on the rod-side of a cylinder piston, the bottom of the hydraulic cylinder being provided with a drainage outlet for leaking fluid, as well as an air inlet, the drainage outlet being connected to a reservoir for collection of leakage fluid, wherein the air inlet is connected with a compressed air reservoir adapted to continuously or periodically apply an overpressure to the lower cylinder space.
A hydraulically actuated piston-cylinder device, the device comprising:
- an elongated cylinder;
- a piston disposed in the cylinder and being reciprocatable along a length of the cylinder, the piston separating the cylinder into first and second sealed chambers;
- means for supplying pressurized oil to the first chamber;
- means for discharging oil from the second chamber that leaked from the first chamber into the second chamber;
- means for collecting the oil discharged from the second chamber;
- and
- means for supplying pressurized air to the second chamber.
A device for a single-acting hydraulic cylinder designed to lift or pull a load upon the existence of an oil pressure on the rod-side of a cylinder piston, the cylinder bottom of the hydraulic cylinder being provided with a drainage outlet for leaking fluid, as well as an air inlet, wherein the reservoir in the position of use is placed at a higher level than the bottom of the cylinder.
A device for a single-acting hydraulic cylinder designed to lift or pull a load upon the existence of an oil pressure on the rod-side of a cylinder piston, the cylinder bottom of the hydraulic cylinder being provided with a drainage outlet for leaking fluid, as well as an air inlet, wherein the cylinder bottom of the hydraulic cylinder is provided with a piston bearing surface which forms a hollow space when the cylinder piston is in the lowered position.
Dependencies are inferred from the claim text.