| 摘要 |
A watercraft lift having raised and lowered positions is provided. The lift includes a substantially rectangular base (10) with longitudinal side beams (34) and front, rear, and intermediate transverse beams (28), (30), (32) connected to the longitudinal beams. The intermediate transverse beam (32) is located between the front and rear transverse beams (28), (30) and at a height lower than the front and rear transverse beams. Forward booms (12) are pivotably connected to the base (10) at a location near the front transverse beam (28). Rear booms (14) are pivotably connected to the base at a location near the intermediate transverse beam (32). A watercraft support platform (24) is pivotally connected to the forward and rear booms (12), (14). The raising and lowering of the lift of the present invention is accomplished by an actuation assembly (26). In a preferred embodiments, the actuation assembly includes two dual-directional high pressure hydraulic cylinders (62) pivotally connected between the intermediate transverse beam (32) and the rear booms (14). During use, the actuator assembly (26) rotates the booms (12), (14) upward and forward about their pivotable connection to the base (10) further raising the watercraft support platform and the watercraft to an overcenter position.
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