Boat lift and design

Abstract

A boat lift includes two support beams, each beam having each having a rectangular interior space, the top surface of each beam extending beyond the rectangle to provide a flange for connecting components to the support beam; a hydraulic cylinder assembly positioned within the interior of each support beam and including a base and a piston; a fixed pulley block connected to the base and a moveable pulley block attached to the piston; a bunk for supporting a boat, the bunk supported by the two support beams; and two cables extending from opposing ends each of the support beams. The boat lift does not require overhead supports.

We claim as follows: 
     
         1 . A boat lift, comprising:
 two support beams, each beam having each having a rectangular interior space, the top surface of each beam extending beyond the rectangle to provide a flange for connecting components to the support beam;   a hydraulic cylinder assembly positioned within the interior of each support beam and including a base and a piston;   a fixed pulley block connected to the base and a moveable pulley block attached to the piston;   a bunk for supporting a boat, the bunk supported by the two support beams; and   two cables extending from opposing ends each of the support beams, the cables extending in opposite directions from fixed pulley block.   
     
     
         2 . The boat lift of  claim 1  further comprising a single pulley positioned at the end of the opposite end of the support beam to the fixed pulley block, the single pulley accepting the cable from the moveable pulley support. 
     
     
         3 . The boat lift of  claim 1  in which the bunk is bolted to the flange on the support beam. 
     
     
         4 . The boat lift of  claim 1  further comprising a single pulley positioned at the end of the opposite end of the support beam to the fixed pulley block, the single pulley accepting the cable from the moveable pulley support and changing the direction of the cable to extend vertically for securing at a fixed anchor point. 
     
     
         5 . The boat lift of  claim 1  in which the fixed pulley block includes  5  pulleys and in which the cable extends vertically from pulley block for securing at a fixed anchor point. 
     
     
         6 . A boat lift, comprising:
 two support beams, each beam having each having an interior space;   each support beam including a hydraulic cylinder assembly positioned within the interior and including a base and a piston;   a fixed pulley block connected to the base;   a moveable pulley block attached to the piston; and   two cables anchored to the fixed pulley block extending from the fixed pulley block in opposite directions, one cable routed from the fixed pulley block to a pulley in the moveable pulley block and the other cable routed from the fixed pulley block to the base.   
     
     
         7 . A stand-alone boat lift having a piston and pulleys in a support beam and sleeve positioned over posts which rest on the surface below the water, the sleeves slidable along the post to level the bunk.