A boat lift has a transverse flotation tank that joins a first flotation tank construct and a second flotation tank construct. The transverse flotation tank has one or more pumps that evacuate water from the first flotation tank construct, the second flotation tank construct and the transverse flotation tank and create flotation of the boat lift. Modular boat lifts may be constructed according to the invention that have substantial size but are transportable by truck for construction on site.

A boat lift has a transverse flotation tank that joins a first flotation tank construct and a second flotation tank construct. The transverse flotation tank has one or more pumps that evacuate water from the first flotation tank construct, the second flotation tank construct and the transverse flotation tank and create flotation of the boat lift. Modular boat lifts may be constructed according to the invention that have substantial size but are transportable by truck for construction on site.

This invention relates to a submersible vessel for dry docking a vessel. The submersible vessel comprises a floating unit, a deck above the floating unit and a number of stabilizing towers arranged on the deck. The deck has a base, a sidewall along a perimeter of the base and a block provided within the sidewall and resting on the base, defining a cavity such that when the vessel is being docked onto the deck, a thruster of the vessel is above the cavity.

This invention relates to a submersible vessel for dry docking a vessel. The submersible vessel comprises a floating unit, a deck above the floating unit and a number of stabilizing towers arranged on the deck. The deck has a base, a sidewall along a perimeter of the base and a block provided within the sidewall and resting on the base, defining a cavity such that when the vessel is being docked onto the deck, a thruster of the vessel is above the cavity.

A floating boat lift having flotation tanks positioned under sides of a frame of the boat lift and a transverse flotation tank that communicates with the flotation tanks. Water flow is regulated so that tanks fill from near the center of the boat lift. Water is accepted into or pumped from the flotation tanks, allowing the frame of the boat lift to fall or rise relative to the surface of the water.

A floating boat lift having flotation tanks positioned under sides of a frame of the boat lift and a transverse flotation tank that communicates with the flotation tanks. Water flow is regulated so that tanks fill from near the center of the boat lift. Water is accepted into or pumped from the flotation tanks, allowing the frame of the boat lift to fall or rise relative to the surface of the water.

A submersible device for lifting a boat over water has a couple of pneumatic containers and an air compressor for their inflation and deflation through valves arranged in the pneumatic containers. The pneumatic containers of the couple are interconnected by way of flexible cross members supporting the boat when the pneumatic containers are inflated.

A submersible device for lifting a boat over water has a couple of pneumatic containers and an air compressor for their inflation and deflation through valves arranged in the pneumatic containers. The pneumatic containers of the couple are interconnected by way of flexible cross members supporting the boat when the pneumatic containers are inflated.

A floating boat lift having flotation tanks positioned under sides of a frame of the boat lift and a transverse flotation tank that communicates with the flotation tanks. Water flow is regulated so that tanks fill from near the center of the boat lift. Water is accepted into or pumped from the flotation tanks, allowing the frame of the boat lift to fall or rise relative to the surface of the water.

A floating boat lift having flotation tanks positioned under sides of a frame of the boat lift and a transverse flotation tank that communicates with the flotation tanks. Water flow is regulated so that tanks fill from near the center of the boat lift. Water is accepted into or pumped from the flotation tanks, allowing the frame of the boat lift to fall or rise relative to the surface of the water.