Boat lift apparatus

Claim 1

A BOAT LIFT APPARATUS COMPRISING IN COMBINATION: FRAME MEANS INCLUDING A PAIR OF INTERCONNECTED, TRANSVERSELY SPACED, UPRIGHT POSTS, ONE OF SAID POSTS ENGAGEABLE WITH A GROUND SURFACE, SAID FRAME MEANS INCLUDING A FLANGE MEMBER SECURED TO THE OTHER POST AND EXTENDED LATERALLY THEREFROM, SAID FLANGE ADAPTED FOR ENGAGEMENT TO THE PLATFORM OF A CONVENTIONAL BOAT DOCK; LIFT MEANS INCLUDING A LONGITUDINALLY EXTENDED BAR, A PAIR OF TRANSVERSELY EXTENDED SUPPORT MEANS SECURED AT OPPOSITE ENDS OF SAID BAR, AND A CROSS BAR SECURED TO SAID LONGITUDINAL BAR, THE CROSS BAR HAVING OPPOSITE ENDS GUIDABLY ENGAGED WITH SAID POSTS; AND HOIST MEANS FOR RAISING AND LOWERING SAID LIFT MEANS, SAID HOIST MEANS INCLUDING A CLUTCH UNIT MOUNTED ON ONE POST, A FIRST PULLEY UNIT ALSO MOUNTED ON SAID ONE POST AND OPERABLE BY SAID CLUTCH UNIT, A CABLE ONE END OF WHICH IS CONNECTED TO SAID FIRST PULLEY UNIT, A SECOND PULLEY UNIT MOUNTED AT THE LOWER END OF SAID ONE POST, A THIRD PULLEY UNIT MOUNTED AT THE LOWER END OF SAID OTHER POST, AND A FOURTH PULLEY UNIT MOUNTED AT THE UPPER END OF SAID OTHER POST, SAID CABLE THREADED BENEATH SAID SECOND AND THIRD PULLEY UNITS AND OVER SAID FOURTH PULLEY UNIT, SAID CABLE SECURED TO SAID LIFT MEANS.