초록 ▼

A boat dock and lift is disclosed in which an upright frame is provided having a pair of spaced upright members and a horizontal cross member therebetween. A lift is movably mounted on the frame. The lift has a support engageable with a boat hull and a pair of generally vertical arms movably mounted

A boat dock and lift is disclosed in which an upright frame is provided having a pair of spaced upright members and a horizontal cross member therebetween. A lift is movably mounted on the frame. The lift has a support engageable with a boat hull and a pair of generally vertical arms movably mounted on the frame uprights. A compound pulley and cable arrangement is mounted on the horizontal cross member of the frame. This pulley and cable arrangement includes a first pulley block stationary with respect to the frame, and a second pulley block movable horizontally along the cross member. A first cable is secured to the frame, is entrained around certain of the pulleys on the first and second pulley block, and is secured to one of the lift uprights. A second cable is also secured to the frame, entrained around others of the pulleys on the first and second pulley blocks, and is secured to the other lift upright. A hydraulic cylinder is secured between the frame and the movable pulley block such that upon actuation of the hydraulic cylinder, horizontal movement of the second pulley block is effected along the cross member toward and away from the first pulley block thereby to take up or let out the cables, and thereby to move both of the lift upright members an equal distance in vertical direction along the frame uprights so as to ensure that the lift support and a boat supported thereon remain in generally horizontal position as the lift is raised and lowered.

대표청구항 ▼

A boat dock and boat lift comprising a frame having a pair of spaced upright members and a horizontal cross member extending between said upright members, a lift mounted on said frame, said lift having a support engageable with a boat hull, said lift being movable between a lowered position in which

A boat dock and boat lift comprising a frame having a pair of spaced upright members and a horizontal cross member extending between said upright members, a lift mounted on said frame, said lift having a support engageable with a boat hull, said lift being movable between a lowered position in which said support is below the surface of the water such that a boat may be floated into position above said support, and a raised position in which said support engages said boat hull from below and lifts the boat clear of the water, said lift having a pair of upright arms each of which is in generally face-to-face relation with a respective one of said frame upright members, means for movably mounting said lift upright arms on said frame upright members as said lift is moved between its raised and lowered positions, and means carried by said frame and connected to said lift upright arms for moving said lift between its raised and lowered position while maintaining said support in a generally horizontal position, this last said moving means comprising a piston and cylinder unit having one end thereof fixed with respect to said cross member, and the other end thereof movable with respect to said cross member, a first pulley block secured to said cross member, a second pulley block slidable on said cross member and connected to said other end of said piston and cylinder unit, each of said pulley blocks having one or more pulleys journaled thereon, a first flexible cable having one end thereof secured with respect to said frame and being entrained around certain of said pulleys on said first and decond pulley blocks, and having its other end secured to one of said lift upright arms, and a second flexible cable having one end thereof secured with respect to said frame and being entrained around others of said pulleys on said first and second pulley blocks and having its other secured to the other end of said lift upright arms so that upon actuation of said piston and cylinder unit, said second pulley block is forceably moved on said cross member toward or away from said first pulley block thereby to move the other ends of said first and second cables an equal distance in generally vertical direction so as to ensure that said lift is maintained in its above said horizontal position as it is moved between its raised and lowered positions.