Hydraulically operated low profile boat lift utilizing at least two pilings
OwnerRobert L. Wayinventor
Life of this patent
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Abstract
An assembly for lifting a boat locatable adjacent a dock requires only two elongate vertically disposed pilings each having a lower end portion mounted into the floor of a body of water near the dock and an upper end portion extending upwardly adjacent the dock. A lift is connected to a boat cradle for moving the cradle substantially vertically and includes a piston/cylinder attached between the dock and cables, which are mounted to each piling and are connected between the piston and the cradle. The piston is movable between a first position for lifting and pulleys and guides are mounted to the pilings and the cradle.
Claims16
A boat lift mounted to a dock comprising a cable-handling unit including:
- a pair of elongate pilings each having one end mounted into a floor of a body of water and an opposite end extending above an edge of the dock,
- a movable piston arm and an oppositely disposed stationary cylinder end secured to the dock,
- a first plurality of pulleys, at least one pulley of said first plurality of pulleys being attached to said piston arm,
- a second plurality of pulleys cooperating with said first plurality of pulleys;
- a cradle for supporting a boat thereon and being operatively movable in a substantially vertical direction along said pair of pilings;
- a pair of elongate cables each having one end routed through said at least one pulley attached to said piston arm and extending to and affixed to said cradle and an opposite end secured to said cable handling unit and routed through said first and second pluralities of pulleys, said first plurality of pulleys directing said cables in a substantially horizontal direction and said second plurality of pulleys guiding said cables vertically adjacent said pair of pilings,
- said piston arm being extensible to a first position away from said cylinder end for lowering said cradle vertically adjacent said pair of pilings and being retractable to a second position for raising said cradle vertically adjacent said pair of pilings, said piston arm and said cylinder end being disposed horizontally to reduce the visual profile of said cable handling unit.
An assembly for lifting a boat locatable adjacent a dock comprising a pair of elongate pilings having a lower end portion mounted into the floor of a body of water near the dock and an upper end portion extending upwardly adjacent the dock, a cradle for carrying a boat, lifting means connected to said cradle for moving said cradle substantially vertically, said lifting means including a movable member attached to the dock, and cable means mounted to each said piling and being connected between said movable member and said cradle, said movable member being movable between a first position for lifting said cradle and a second position for lowering said cradle, said movable member including a hydraulic operating means having an extensible piston arm and a stationary cylinder, said cable means mounted to said piston arm, said cable means including a first pulley mounted to said piston arm and a second pulley mounted to the dock adjacent said first pulley and a third pulley mounted to the dock at a location spaced away from said second pulley, a first cable having one end attached to said cradle and a second cable having one end attached to said cradle spaced away from said first cable, a bracket for affixing other ends of both said cables to the dock at a single location, said first cable threaded around said second pulley and said first pulley, said second cable threaded around said third pulley and said second pulley and said first pulley such that the vertical distance of movement of said cradle is twice the distance of movement of said piston arm when said hydraulic operating means is operated for moving said cradle vertically.
Dependencies are inferred from the claim text.