Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...
Patent
1988-10-13
1990-07-31
Butler, Douglas C.
Marine propulsion
Screw propeller
With means effecting or facilitating movement of propulsion...
188299, 188300, 18832213, 18832215, 188314, 267 6412, 267 6415, B63H 512
Patent
active
049447050
ABSTRACT:
The invention consists of a novel tilt damper equipped with two oil chambers; one in the piston-rod extended position and the other in the piston-rod retracted position, which are respectively connected to a gas chamber through an oil passage where a relief valve and a check valve are provided. These valves are alternatively disengaged from the closed condition by an external operator. When these valves are open, oil flows freely into and out of them to allow gas pressure to drive the piston rod in the direction of extension. When only the check valve on the piston-rod oil chamber in the extended position is open, the tilt damper does not move in the direction of retraction. When overload is applied in the direction of extension of the piston rod, the tilt damper extends by applying a negative pressure to the oil chamber on the retraction part. When the overload is removed, the tilt damper automatically returns to the original position. When both valves are closed, the piston is locked by oil pressure to prevent the piston rod from moving in either directions.
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Hanawa Nobumichi
Kashima Mitsuhiro
Butler Douglas C.
Kayaba Kogyo Kabushiki Kaisha
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