Ships – Vessel raising and docking
Patent
1987-02-26
1988-11-29
Barefoot, Galen
Ships
Vessel raising and docking
405 3, 414678, B63C 716
Patent
active
047873272
ABSTRACT:
According to the invention, a lift is provided having base beams, first and second pairs of lifting arms and lifting rails. The lifting arms have one end pivotally mounted to the base beams for rotation about parallel axes with the common plane of the axes residing substantially in a horizontal orientation. The other ends of the lifting arms pivotally connect to the lifting rails to define, when viewed from the side, a closed linkage that permits the lifting rails to be raised and lowered relative to the base upon the lifting arms being simultaneously pivoted. The bow pair of lifting arms are longer than the stern pair of lifting arms, and the distance between the pivots on the base beams is greater than the distance between the pivots on the rails so that the linkage cannot lock-up when in the loading position and so that a craft resting on the rails is inclined with the bow above the stern for drainage. A cross bar defining one pivot center is engaged by the bottom of the rails when the lift is in the loading position whereby the box lifting arms form an angle with the beams that not only prevents the linkage from locking up but also minimizes the initial lifting force needed to raise the rails and a boat docked thereon.
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Barefoot Galen
Salmon Paul E.
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