| 摘要 |
A boat lift and leveler are provided in which the boat lift consists of a cradle supported by at least two pontoons laterally disposed beneath and fixed to the cradle. A leveler for the lift includes a pair of pneumatic duct systems. One of the systems connects to air vents on the starboard side pontoons and the other system connects to air vents on the port side pontoons. Each system includes an intake path, an exhaust path and a valve in each path. The intake path is connected to a source of air under pressure and the exhaust path extends to the atmosphere. An enclosure fixed to the lift lists to starboard or port with the lift. A V-shaped track rests in the enclosure. The track has a starboard arm which rotates below horizontal at a predetermined degree of starboard list of the enclosure and a port arm which rotates below horizontal at a predetermined degree of port list of the enclosure. One mechanism automatically closes the intake path valve to the pontoons on the starboard side of the lift when the port arm falls below horizontal during the lifting process. A similar mechanism controls the port side pontoons in response to the starboard arm. Another mechanism automatically closes the exhaust path valve to the pontoons on the starboard side of the lift when the starboard arm falls below horizontal during the lowering process. A similar mechanism controls the port side pontoons in response to the port arm.
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