Ships – Mother ship – floating landing platform – and harbor – Vessel carrier
Reexamination Certificate
2001-02-01
2001-12-11
Swinehart, Ed (Department: 3641)
Ships
Mother ship, floating landing platform, and harbor
Vessel carrier
C114S369000
Reexamination Certificate
active
06327992
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to hydraulic boat lifts. More particularly, it refers to a hydraulic lift mounted on the transom of a watercraft for lifting small auxiliary watercraft from the water, including support means for preventing damage caused by following seas.
DESCRIPTION OF THE INVENTION
Hydraulic operated boat lifts generally are well known as shown in U.S. Pat. Nos. 4,895,479; 5,184,914; 5,275,505; 5,890,835; and 5,919,000. None of these lift systems is adapted for mounting on the transom of a watercraft. Applicant has previously developed a vessel transom mounted hydraulic lift system for supporting a platform used to cradle an auxiliary watercraft. However, this system had a limitation which prevented practical utilization. During heavy following seas, the impact of water on the platform caused the hydraulic lift system arms to collapse. A hydraulic lift system is needed which will be practical for long term use mounted on the transom of a watercraft for the purpose of lifting small auxiliary watercraft out of the water and withstanding the impact of large waves during following seas.
SUMARRY OF THE INVENTION
This invention satisfies the need for an efficient and practical hydraulic lift system attached to a transom of a watercraft for lifting small auxiliary watercraft out of the water and withstanding wave action caused by following seas. The hydraulic lifting apparatus includes a transom bracket bolted to a transom of a watercraft, the transom bracket enclosing an hydraulic power cylinder operating multiple link arms causing a platform bracket to move in a vertical direction upwards from the water or down into the water. The platform bracket supports a platform and a boat cradle for supporting a small auxiliary watercraft. A locking plate operated by a hydraulic cylinder and grooves for receipt of a transverse pin lock the platform in an upright position and stops to prevent distortion of the action arms create a stable platform resistant to wave action.
The hydraulic power cylinder is either operated electrically or by a manual override connected to a hand pump.
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patent: 5170742 (1992-12-01), Roskelley
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patent: 5544606 (1996-08-01), Schmidt, Jr.
patent: 5562362 (1996-10-01), Vezner
patent: 5687663 (1997-11-01), Wahlstrand
patent: 5690045 (1997-11-01), Gauthier
patent: 5890835 (1999-04-01), Basta et al.
patent: 5919000 (1999-07-01), Unkle
General Hydraulic Solutions, Inc.
Larson James E.
Larson & Larson P.A.
Swinehart Ed
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