Hydraulic lift for boats

Details Hydraulic lift for boats Hydraulic lift for boats

1997-08-14

1999-04-06

Graysay, Tamara L.

Hydraulic and earth engineering

Marine vessel portage, launching, or removing

Lifting

405 7, 114 44, 414678, 187213, B63C 306, B63C 700

Patent

active

058908358

ABSTRACT:
A hydraulic lift for raising a boat out of water into a raised storage position is proposed. Pivoting booms are connected to a frame that is supportable by a bed of a body of water. A boat rack is provided at an upper portion of the pivoting booms. A hydraulic cylinder is connected between the frame and a lower portion of the pivoting booms. The pivoting booms are selectively adjustable between a lowered position wherein the rack is submerged in the water and a raised storage position wherein the rack is raised above the water. The position of the pivoting booms is controlled by a ram of the hydraulic cylinder. Importantly, the pivoting booms are maintained in the raised storage position when the ram is in a retracted position which protects the ram from corrosion and fouling. In the preferred embodiment, the pivoting booms are rotated over center when they are in the raised storage position.

REFERENCES:
patent: 2963176 (1960-12-01), Smith
patent: 3021965 (1962-02-01), Harvey
patent: 3083540 (1963-04-01), Smith
patent: 3753355 (1973-08-01), Knoch
patent: 4022027 (1977-05-01), Tetzner
patent: 4895479 (1990-01-01), Michaelsen et al.
patent: 5120022 (1992-06-01), Kubik
patent: 5184914 (1993-02-01), Basta
patent: 5485798 (1996-01-01), Samoian et al.

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