Gravity watercraft lift

Details Gravity watercraft lift Gravity watercraft lift

2005-01-04

2005-01-04

Lagman, Frederick L. (Department: 3673)

Hydraulic and earth engineering

Marine vessel portage, launching, or removing

Lifting

Reexamination Certificate

active

06837651

ABSTRACT:
In a lift for watercraft, a load translation mechanism balances load upon the actuator throughout the raising and lowering of watercraft, thereby greatly reducing load spikes. Embodiments of the improved lift employing an over-center locking mechanism further employ an elastic stop means to reduce jarring of the apparatus when it locks in the over-center position. In some preferred embodiments, adjustable telescoping booms allow the user to adjust the height of the lifted watercraft above the base of the lift.

REFERENCES:
patent: 3021965 (1962-02-01), Harvey
patent: 4895479 (1990-01-01), Michaelsen et al.
patent: 5184914 (1993-02-01), Basta
patent: 5275505 (1994-01-01), Wilcox
patent: 5888019 (1999-03-01), Quastad
patent: 5890835 (1999-04-01), Basta et al.
patent: 5908264 (1999-06-01), Hey
patent: 5919000 (1999-07-01), Unkle
patent: 6318929 (2001-11-01), Basta
patent: 6612775 (2003-09-01), Hewitt

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