Patent ID: 11912543
Assignee: SUPERIOR GEARBOX COMPANY
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 18:
19. A boat lift, comprising:
a drive motor having a drive shaft;
a first worm screw operably connected to the drive shaft and defining an axis of rotation aligned with the drive shaft, the first worm screw including a first worm gear, the first worm screw and the first worm gear defining a first lifting stage;
a second worm screw operably connected to the first worm gear and including a second worm gear, the second worm screw and the second worm gear defining a second lifting stage;
a tapered roller bearing assembly operably engaging the second worm screw, the tapered roller bearing assembly having a first tapered roller bearing secured at a first location proximate a first end of the second worm screw and provides support between the first lifting stage and the second lifting stage, and a second tapered roller bearing secured at a second location proximate a second opposing end of the second worm screw and provides support between the second lifting stage and the third lifting stage, wherein the first tapered roller bearing and the second tapered rolling bearing face one another on the second worm screw and provide equal rolling torque to the second worm screw; and
a spool operably connected to the second worm wheel and a cable disposed about the spool for lifting a boat, the spool defining the third lifting stage;
wherein the tapered roller bearing assembly operably engages the second worm screw for reducing mechanical noise during rotation of the second worm screw.