Boat dock and lift

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.