Hydraulic system for raising and lowering keel

Details Hydraulic system for raising and lowering keel Hydraulic system for raising and lowering keel

1974-11-08

1976-04-20

Blix, Trygve M.

Ships

Keels

Vertical adjustment

114132, 115 41HT, B63B 4100

Patent

active

039510905

ABSTRACT:
The hydraulic system for raising and lowering a heavy keel comprises a cylinder, a piston movable in the cylinder and connected to the keel, and an accumulator for supplying hydraulic fluid at a positive pressure below that necessary to raise the keel against the piston in a direction for raising the keel. A hand pump is provided for supplying hydraulic fluid at a pressure great enough to overcome the weight of the keel. A valve allows the hydraulic fluid to flow either to or from the cylinder. An enlarged flow line communicates the accumulator with the cylinder so that if an external force should cause the keel to raise suddenly, hydraulic fluid would flow rapidly beneath the piston. A gas is provided on the other end of the piston for providing a cushioning effect and restricting the speed at which the keel can be raised. A restricted flow valve is provided in the system for regulating the speed at which the keel can be lowered.

REFERENCES:
patent: 667158 (1901-01-01), Webster
patent: 3587513 (1971-06-01), Stimatze
patent: 3717995 (1973-02-01), Case
patent: 3722455 (1973-03-01), Carpenter

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