Patent ID: 11932364
Assignee: SUNSTREAM CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 28:
29. A watercraft lift apparatus for lifting and lowering a watercraft having at least left and right side pontoons, a watercraft lift apparatus for lifting and lowering a watercraft having left and right side pontoons, and a center pontoon between the left and right side pontoons, comprising:
a rearward lateral beam;
a forward lateral beam;
a longitudinal left side beam having a rearward end portion and a forward end portion, the rearward end portion being supported by the rearward lateral beam and the forward end portion being supported by the forward lateral beam;
a longitudinal right side beam having a rearward end portion and a forward end portion, the rearward end portion being supported by the rearward lateral beam and the forward end portion being supported by the forward lateral beam;
a left side rearward lifting arm having a lower end portion pivotally attached to the rearward end portion of the longitudinal left side beam and an upper end portion, the left side rearward lifting arm being rotatable about the longitundinal left side beam in a first left side plane;
a right side rearward lifting arm having a lower end portion pivotally attached to the rearward end portion of the longitudinal right side beam and an upper end portion, the right side rearward lifting arm being rotatable about the longitundinal right side beam in a first right side plane;
a left side forward lifting arm having a lower end portion pivotally attached to the forward end portion of the longitudinal left side beam and an upper end portion;
a right side forward lifting arm having a lower end portion pivotally attached to the forward end portion of the longitudinal right side beam and an upper end portion;
a left side watercraft support having an upwardly opening Y-shape to support the left side pontoon, the left side watercraft support having a rearward end portion pivotally connected to the upper end portion of the left side rearward lifting arm, and a forward end portion pivotally connected to the upper end portion of the left side forward lifting arm;
a right side watercraft support having an upwardly opening Y-shape to support the right side pontoon, the right side watercraft support having a rearward end portion pivotally connected to the upper end portion of the right side rearward lifting arm, and a forward end portion pivotally connected to the upper end portion of the right side forward lifting arm;
a left side actuator having a lower end portion pivotally attached to the rearward end portion of the longitudinal left side beam and an upper end portion pivotally attached to the left side rearward lifting arm; and
a right side actuator having a lower end portion pivotally attached to the rearward end portion of the longitudinal right side beam and an upper end portion pivotally attached to the right side rearward lifting arm;
wherein the left side watercraft support has a rearward support with an upwardly opening Y-shape and a forward support with an upwardly opening Y-shape, which in combination are positioned to support the left side pontoon, and the right side watercraft support has a rearward support with an upwardly opening Y-shape and a forward support with an upwardly opening Y-shape, which in combination are positioned to support the right side pontoon, the rearward and forward supports of the left side watercraft support being in longitudinal alignment and at least one of the rearward and forward supports of the left side watercraft support being selectively longitudinally movable relative to the other of the rearward and forward supports of the left side watercraft support and securely retainable in the selected positions during use of the watercraft lift, and the rearward and forward supports of the right side watercraft support being in longitudinal alignment and at least one of the rearward and forward supports of the right side watercraft support being selectively longitudinally movable relative to the other of the rearward and forward supports of the right side watercraft support and securely retainable in the selected positions during use of the watercraft lift.