Abstract: A watercraft lift with rearward and forward lateral beams, left and right side longitudinal side beams, a pair of left side lifting arms, a pair of right side lifting arms supporting at their upper ends left and right side watercraft supports, and left and right side actuators pivotally attached to the left and right side rearward lifting arms. In one embodiment the left side rearward lifting arm and the left side actuator rotate about their pivotal attachments to the longitundinal left side beam in a left side plane, and the right side rearward lifting arm and the right side actuator rotate about their pivotal attachments to the longitundinal right side beam in a right side plane.

Abstract: A watercraft lift with hydraulically actuated arms which self-installs a fitted three-dimensional watercraft cover on a powerboat. A mechanism enables a linear actuator to drive a swing arm up to 180 degrees. The upper end of a two part arm articulates mechanically as the arm moves to reduce vertical elevation while operating. A spring-tensioned elongated roller keeps the cover tight and self-rolls the cover on the elongated roller when the actuated arms are pivoted forward. The mechanism can be attached to the guides of most watercraft lifts.

Abstract: A boat lift with hydraulically or mechanically actuated arms which self-installs a fitted three-dimensional boat cover on a powerboat. The control logic of the system allows for cover operation only when the lift is raised. A spring-tensioned roller keeps the cover tight and self-rolls the cover on the roller when the actuated arms are pivoted forward. The roller is hidden behind the boat in ‘cover-on’ position. A slip clutch prevents the torsion spring from being over tightened. The forward position of the roller is adjusted by adjusting the hydraulic cylinder length. The rearward position of the roller is adjusted by limiting the retracted position of the hydraulic cylinder. A non-hydraulic embodiment actuates the cover when the lift is operated.

Abstract: A boat lift with hydraulically or mechanically actuated arms which self-installs a fitted three-dimensional boat cover on a powerboat. The control logic of the system allows for cover operation only when the lift is raised. A spring-tensioned roller keeps the cover tight and self-rolls the cover on the roller when the actuated arms are pivoted forward. The roller is hidden behind the boat in ‘cover-on’ position. A slip clutch prevents the torsion spring from being over tightened. The forward position of the roller is adjusted by adjusting the hydraulic cylinder length. The rearward position of the roller is adjusted by limiting the retracted position of the hydraulic cylinder. A non-hydraulic embodiment actuates the cover when the lift is operated.

Abstract: A free-floating, compact, self-stabilizing, self-monitoring, remote-controlled, shallow-water, solar, high-speed, air displacement watercraft lift constructed of polyethylene tanks, and non-metallic structure. This device provides vertical lifting by inflating 4 or more air tanks at once using a blower for each tank, pushing water out an exit hole on the bottom of each tank. Each tank has an electric valve for filling and another for exhausting air. Pairs of tanks are pivotally connected along the centerline, and pairs of tanks are connected with a union tube inside the axles. A monitoring system fills the air tanks if air leaks. The width of the lift is adjusted by adjusting the center bunk height, or by adding a spacer.

Abstract: A watercraft lift with hydraulically actuated arms which self-installs a fitted three-dimensional boat or other watercraft cover on a powerboat or other watercraft. Control logic allows for cover operation only when the lift is raised, and has a single control for both the lift and cover system. A spring-tensioned roller keeps the cover tight and self-rolls the cover on the roller when the actuated arms are pivoted forward. The roller is hidden behind the watercraft when in a “cover-on” position.

Abstract: A free-floating, compact, self-stabilizing, self-monitoring, remote-controlled, shallow-water, solar, high-speed, air displacement watercraft lift constructed of polyethylene tanks, and non-metallic structure. This device provides vertical lifting by inflating 4 or more air tanks at once using a blower for each tank, pushing water out an exit hole on the bottom of each tank. Each tank has an electric valve for filling and another for exhausting air. Pairs of tanks are pivotally connected along the centerline, and pairs of tanks are connected with a union tube inside the axles. A monitoring system fills the air tanks if air leaks. The width of the lift is adjusted by adjusting the center bunk height, or by adding a spacer.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.

Abstract: A watercraft lift with hydraulically actuated arms which self-installs a fitted three-dimensional boat or other watercraft cover on a powerboat or other watercraft. Control logic allows for cover operation only when the lift is raised, and has a single control for both the lift and cover system. A spring-tensioned roller keeps the cover tight and self-rolls the cover on the roller when the actuated arms are pivoted forward. The roller is hidden behind the watercraft when in a “cover-on” position.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.

Abstract: The floating drive-on docking system for a watercraft uses a main floatation portion where the watercraft rests when loaded and a pivoting entry portion for creating a low loading angle between the watercraft and the floating drive-on docking system, resulting in only a small amount of propulsion from the watercraft being required to load onto the docking system. The pivoting entry portion has entry features, either rollers or raised bumps, that remain above the waterline when not engaged by the watercraft to keep the loading surfaces free from marine growth that can harm the hull of a watercraft. Wide side guides on the pivoting entry portion assist in positioning the craft for loading onto the docking system.

Abstract: A self-adjusting watercraft canopy/cover assembly having a protective cover and a floating watercraft lift. The lift includes a watercraft lifting support and a float attached to the watercraft lifting support for supporting the watercraft lifting support on a body of water. The float is movable to selectively lift and lower the watercraft lifting support relative to the body of water along a first path of movement. The lift further includes an assembly which causes the protective cover to move along a second path of movement different from the first path in response to movement of the float.

Abstract: A watercraft lift for raising and lowering a watercraft in water, including a buoyant pontoon, a lifting cradle and at least one pivot arm. The lifting cradle includes at least one air tank and a support bunk configured to receive and support the watercraft. The air tank has an internal chamber configured to receive and release pressurized air. The internal chamber has sufficient internal volume that when sufficient pressurized air is received therein the air tank has sufficient buoyancy to lift the lifting cradle to a raised position with the watercraft out of the water when positioned on the support bunk and that when sufficient pressurized air is released from the internal chamber the air tank loses sufficient buoyancy to sink the lifting cradle to a lowered position sufficiently submerged to receive and deploy the watercraft.

Abstract: A watercraft lift with translating bunks supported by a base frame and having rollers mounted to the base frame to initially raises the watercraft upward when driven onto the lift sufficiently to be positioned above the bunks when in their lowered position and thereby permit operation of the lift in water too shallow for use of the bunks by themselves. The rollers are positioned relative to the translating bunks such that when the bunks are in their lowered position and the lift is used in sufficiently shallow water, the watercraft driven onto the lift initially engages the rollers, which lift the watercraft upward above the height when floating in the water and above the height of the bunks. The translating bunks are then used to lift the watercraft off of the rollers and upward to a raised position above the water.

Abstract: A watercraft lift with translating bunks supported by a base frame and having rollers mounted to the base frame to initially raises the watercraft upward when driven onto the lift sufficiently to be positioned above the bunks when in their lowered position and thereby permit operation of the lift in water too shallow for use of the bunks by themselves. The rollers are positioned relative to the translating bunks such that when the bunks are in their lowered position and the lift is used in sufficiently shallow water, the watercraft driven onto the lift initially engages the rollers, which lift the watercraft upward above the height when floating in the water and above the height of the bunks. The translating bunks are then used to lift the watercraft off of the rollers and upward to a raised position above the water.

Abstract: The invention generally relates to an apparatus and method that allows the lifting range of a four-bar, ground-based watercraft lift to be adjustable. More particularly, it relates to a ground-based watercraft that that allows for the lifting range of a watercraft support structure to be adjustable relative to the base of a watercraft lift while also maintaining the lift's shallow water functionality.

Abstract: The invention generally relates to an apparatus and method that allows the lifting range of a four-bar, ground-based watercraft lift to be adjustable. More particularly, it relates to a ground-based watercraft that that allows for the lifting range of a watercraft support structure to be adjustable relative to the base of a watercraft lift while also maintaining the lift's shallow water functionality.

Abstract: An apparatus and method for covering a watercraft with a self-adjusting watercraft cover coupled to a watercraft lift is disclosed.