Hydraulic boat lift

Details Hydraulic boat lift Hydraulic boat lift

2007-09-25

2007-09-25

Lagman, Frederick L. (Department: 3673)

Hydraulic and earth engineering

Marine vessel portage, launching, or removing

Lifting

C114S044000, C414S678000

Reexamination Certificate

active

11324955

ABSTRACT:
An improved boat lift with an hydraulically-powered jack is provided with a locking mechanism, not only for maintaining the lift in its raised position when water pressure in the jack cylinder is released, but also to make it difficult or impossible to unlock by a potential thief or vandal. In accordance with the present invention, this object is achieved by providing a pawl member that engages a recess in the piston shaft that can be removed only with water pressure applied through an attached hose. Access to the water supply should be restricted for purposes of security. The pawl member is attached by a pivoting flap to the end of the cylinder from which the piston emerges. The flap has a flat underside so that water pressure directed against it will easily dislodge it from a recess.

REFERENCES:
patent: 3753355 (1973-08-01), Knoch
patent: 4895479 (1990-01-01), Michaelsen et al.
patent: 5184914 (1993-02-01), Basta
patent: 5275505 (1994-01-01), Wilcox
patent: 5485798 (1996-01-01), Samoian et al.
patent: 5908264 (1999-06-01), Hey
patent: 5919000 (1999-07-01), Unkle
patent: 6837651 (2005-01-01), Basta

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