Locking system for boat water-lifts

Details Locking system for boat water-lifts Locking system for boat water-lifts

1993-01-15

1994-01-04

Taylor, Dennis L.

Hydraulic and earth engineering

Marine vessel portage, launching, or removing

Lifting

114 44, 114 48, 405 4, B63C 306

Patent

active

052755053

ABSTRACT:
The piston rod of a lift cylinder unit on a boat lift is selectively locked from extending or retracting by a locking mechanism having a clamping ring which is sleeved on the piston rod and is biased into locking position by a compression spring engaging a piston in a locking cylinder. This cylinder is selectively supplied with pressurized water to compress the spring and thereby release the clamping ring. Hydraulic lines extend to the lift cylinder and locking cylinder from a control manifold located adjacent the boat lift for remotely operating the lift and the locking mechanism.

REFERENCES:
patent: 2505832 (1950-05-01), Lange
patent: 3021965 (1962-02-01), Harvey
patent: 4022027 (1977-05-01), Tetzner
patent: 4329082 (1982-05-01), Gillis
patent: 4895479 (1990-01-01), Michaelsen et al.
patent: 5051027 (1991-09-01), Horton
patent: 5184914 (1993-02-01), Basta

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