Abstract: An add-on structure for cradle boat lifts incorporating a piling brace that, when hurricane winds threaten, provides for the interconnection of the pilings to the cradle of a cradle boat lift. One or more piling braces span the distances between the inboard pilings and the cradle beams. The outboard piling braces are similarly configured. Cradle brackets attach to the cradle and provide for the crosswise attachment of the piling brace to the cradle beam. The piling braces are permanently attached to the piling or intermittently secured by U-bolt to piling pads, which are permanently secured to the pilings.

Abstract: A boat lift apparatus is disclosed. The boat lift apparatus includes a base structure having a first frame section erected over a barrier juxtaposed to a first body of water, the base structure having a second frame section that may be cantilevered over the first body of water and a lift frame operatively coupled with the base structure. The boat lift apparatus further includes a cradle assembly including at least one boat support for receiving a boat and carrying the boat across the barrier, the cradle assembly being moveably coupled to the lift frame. The boat lift apparatus further includes at least one hydraulic cylinder secured to the lift frame and operatively connected to the cradle assembly, wherein activation of the at least one hydraulic cylinder moves the cradle assembly up or down in the vertical direction.

Abstract: A programmable boatlift system having a cable extending up from one end of a boatlift cradle, across to a shaft attached to a motor, and down to an opposite end of the boatlift cradle. The cable passes through a hole in the shaft. A position sensor having an idler sheave is placed on the cable. The motor winds or unwinds the cable around the shaft to cause the cable to move across the roller sheave to raise or lower the boatlift cradle. The position sensor produces an output signal proportional to the distance the cable travels over the idler sheave as the cable causes the idler sheave to rotate. An electronic control circuit uses the output signal to infer the vertical position of the boatlift cradle and to position the boatlift cradle as desired.

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 method of retrieving a boat from the water by supporting the boat by two lift sections, each of which has an inflatable bunker and a cradle structure that supports and positions the bunker. The lift sections are connected to a mobile support structure which brings these lift sections to a location near the water into which the boat is to be retrieved. The lift sections are lowered and positioned into the water and the boat is floated into the lift region between them. The lift sections are raised upwardly to carry the boat from the water and to another location over a land surface.

Abstract: A platform includes main transverse beams (“MTBs”), each supported by at least one hoist. It is determined whether a load on any MTB is different from the load on any other MTB by more than a predetermined amount. An MTB which has a load different from the load on any other MTB by more than a predetermined amount is selected and then vertically moved with respect to the other MTBs within a predetermined safety limit to transfer load between the selected MTB and the other MTBs while monitoring the loads on each MTB and the position of the selected MTB as vertical movement of the selected MTB proceeds. The monitored loads and position are compared with the safety limit; and the movement of the selected MTB stopped when either the desired load transfer is completed or the safety limit has been met.

Abstract: Fresh water rinsing of a boat hull of a boat occurs to remove contamination from the boat hull during each raising operation of the boat utilizing a boat lift. The contamination coming primarily from a body of water in which the boat operate. The contamination, if left on the boat hull while positioned on the boat lift and out of the body of water, will have an adverse effect upon the condition of the boat hull. A series of intermittent burst of fresh water from each fresh water discharge occur through a respective angle of discharge in a respective repetitive cycle of passes during the raising operation of the boat lift. Each fresh water discharge is generally fixedly positioned relative to a fixed portion of the boat lift. Rinsing of the boat cradle of the boat lift also occurs to remove contamination therefrom to reduce adverse effects to the cradle.

Abstract: A portable marine lift capable of multi-directional off-loading of yachts, ships, and other marine vessels at ground level to dry-dock them. It is compact and barge-like, and can be shared by independent shipyards, or used to expand the work area within a single port facility or shipyard. It is also self-contained when fitted with generators and/or propulsion means via add-on pods, and comprises independent platform sections joined together to meet any hull design, length and water depth. Platform sections have the ability to submerge, and may also be employed to capture and temporarily contain environmentally hazardous materials commonly produced by shipyards. In addition, the platform sections are preferably open-framed for weight savings. Computerized lifting, via multiple lift modules secured to platform sections, assures lifting of vessels in substantially level orientation.

Abstract: A watercraft support and tote device having a frame sub-assembly having a first frame member and a second frame member and at least one support member; a power output member; a hydraulic sub-assembly having a hydraulic vessel, a control system, and a conduit; at least one ground engaging wheel; a drive member; a winch; and a plurality of watercraft support members.

Abstract: A boat lift supported completely from land adjacent to water in which a boat is to be operated for movement between storage and launching positions by the use of parallelogram linkage powered by pairs of hydraulic actuators arranged at opposite sides of the boat lift. A walk and handrails are formed between the hydraulic actuators for use by passengers boarding the boat in the boat launch position.

Abstract: A cradle assembly for moving and positioning a watercraft with respect to a support module. The cradle assembly comprises a plurality of horizontally varying cradle beams, a cradle wall extending upward from the cradle beams and a transportation track traversing the cradle beams. A transportation rail is slideably positioned on the transportation track to engage the bottom of the water craft as the cradle assembly moves the watercraft with respect to the support module. A positioning system is operatively connected to the transportation rail to extend a substantial portion of the transportation rail within the support module to place the watercraft in and retrieve it from the support module.

Abstract: A boat lifting and stacking vehicle having a low profile frame, a carriage connected to a frame via a transverse I-beam track, a mast having a pair of forks protruding therefrom, and a hydraulic suspension system. The vehicle further includes an operating console that moves transversely and vertically with the carriage for enhanced operator visibility. Additionally, the vehicle does not require extra counterweights as the length of the frame and location of the engine equipment and fuel tanks provide adequate rotational balance for even the heaviest boat loads during the boat storage process. Moreover, the front wheel bases include a pair of deployable hydraulic cylinders that work in combination with the wheels as a weight distribution means. For proper loading and unloading alignment, a variety of steering options are available via the computer operated controls.

Abstract: A system for lifting ships from one waterway to another waterway. A convex basin is constructed between the waterways and slidably receives a pair of inter-connected chambers movable transverse to the direction of the waterway.

Abstract: A boat hoist utilizing a lightweight frame for support of a moving platform, which traverses the frame lifting the watercraft above the surface of the water. Minimal force applied to a single hand wheel on a winch, and pulley system with a flexible cable, will provide the drive to lift and lower the moving platform. This invention distributes the load between the four-roller assemblies without creating undue torsional and/or twisting force to the moving platform, the load is carried by roller assembly and frame and not solely the flexible cable. The dual inclined roller surface, pulley system, and roller wheels reduce the force required to raise the platform. Legs support the lightweight frame assembly, and are adjustable to accommodate uneven terrain on the bottom surface. This system utilizes fewer flexible cables and moving parts than traditional systems, as well as all moving parts remain above the waterline during storage for improved reliability and reduced maintenance.

Abstract: The pontoon boat lift system comprises a plurality of lifts. Each lift is comprised of a channel that mounts to deck support members of the boat. One end of a leg is pivotally mounted to one end of the channel. A screw supported in the channel is turned by a connection to an electric motor. A threaded follower on the screw travels along the screw when it is rotated by the motor. A fulcrum arm connects between the threaded follower and the leg to transmit a longitudinal movement of the follower into a pivotal movement of the leg. The leg is thus moveable between a raised and a lowered position. A base pad connected to the opposite end of the leg comprises a plurality of spaced support surfaces that contact the bottom of a body of water. The base pad supports the leg on the bottom of the body of water and easily separates from the bottom when the leg is moved to the raised position. The operation of the lifts is coordinated to raise the pontoon boat above the surface of the water at desired shoreline locations.

Abstract: A boat lift transportation assembly for boat lifts is attachable to and removable from any cantilever boat lift. It comprises a steerable front lever that is positioned adjacent the front upper and lower cross-members of the boat lift and left and right rear levers positioned adjacent the rear upper and lower cross-members. Each lever has a wheel on the bottom so that the boat lift is automatically placed on wheels when the boat lift is raised, provided the levers have been positioned previously. Besides the wheel on the bottom, each lever has a height adjustable beam having a lower and upper hook. The boat lift's lower cross-members sit on the rest areas of the lower hooks and the boat lift's upper cross-rnembers are restricted by the upper hooks.

Abstract: Devices, apparatus and systems for raising and lowering watercraft such as personal watercraft, jet skis, inflatables from transoms on boats, from bulkheads and from docks, and for raising and lowering other types of vessels. A single actuator such as a fluid operated cylinder and single piston can raise and lower a cradle that supports the personal watercraft. An crank bracket can be fixably attached to a crank shaft, and an arm which supports the cradle can be fixably attached to the crank shaft. The arm can be extendable to different lengths. The cradle can include a self-leveling carriage that uses rollers to roll on a curved surface of the cradle allowing the supported watercraft to remain in a substantially level position thereon. An adjustable swivel mount can also be used to lock the cradle to the arm in a fixed orientation.

Abstract: An improved boat lift with an hydraulically-powered jack is provided with a locking mechanism, not only for maintaining the lift in its raised position when water pressure in the jack cylinder is released, but also to make it difficult or impossible to unlock by a potential thief or vandal. In accordance with the present invention, this object is achieved by providing a pawl member that engages a recess in the piston shaft that can be removed only with water pressure applied through an attached hose. Access to the water supply should be restricted for purposes of security. The pawl member is attached by a pivoting flap to the end of the cylinder from which the piston emerges. The flap has a flat underside so that water pressure directed against it will easily dislodge it from a recess.

Abstract: Apparatuses and methods useful for helping to center watercraft—such as personal watercraft, ski boats, fishing boats, luxury boats, and the like—as they are docked (such as on trailers or watercraft-lifting systems), especially in rough waters and/or strong crosswinds.

Abstract: The pontoon boat lift system comprises a plurality of lifts. Each lift is comprised of a channel that mounts to deck support members of the boat. One end of a leg is pivotally mounted to one end of the channel. A screw supported in the channel is turned by a connection to an electric motor. A threaded follower on the screw travels along the screw when it is rotated by the motor. A fulcrum arm connects between the threaded follower and the leg to transmit a longitudinal movement of the follower into a pivotal movement of the leg. The leg is thus moveable between a raised and a lowered position. A base pad connected to the opposite end of the leg comprises a plurality of spaced support surfaces that contact the bottom of a body of water. The base pad supports the leg on the bottom of the body of water and easily separates from the bottom when the leg is moved to the raised position. The operation of the lifts is coordinated to raise the pontoon boat above the surface of the water at desired shoreline locations.

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: An improved winch assembly adaptably configured for use with a new or existing lift structure suitably dedicated for short- and long-term storage of a recreational boat and related watercraft. The winch assembly comprises three drive assemblies housed and mounted within a chassis. The first drive assembly comprises a first plate sprocket and a pair of cable guards collectively mounted onto a cable hub to form a spool assembly for accepting and winding thereon a predetermined length of cabling. The second drive assembly comprises a stepped hub having three discrete cylindrical surfaces to form first and second annular walls for mounting thereagainst primary and secondary plate sprockets and an inner bore extending therethrough for receiving therein an intermediate axle having ends affixed to the chassis, wherein the primary plate sprocket is connectively coupled with the first plate sprocket by a drive chain.

Abstract: The personal watercraft lift attachable to a mooring piling 6 for raising and lowering a watercraft from the water is disclosed. The lift has a cradle 1 attached to a mast 2 secured between two brackets 26 and 30. A lift cable 8 attaches the cradle 1 to a power unit 27 with motor 4. Optional guard pipes 11 on the cradle are provided. The lift pivots approximately 180° to enable easy accessibility to a PWC for mounting, demounting storage and maintenance.

Abstract: A novel watercraft lifting system for raising a watercraft to different positions relative to water and docks at least includes: at least one motorized winch adapted to be coupled via lift cables to a watercraft lift, the watercraft lift adapted to carry the watercraft thereon; a control unit coupled to the motorized winch to control the operation of the motorized winch; a cable tension detector adapted to detect the tension in the lift cables, and coupled to the control unit; and a user control transmitter adapted to transmit user-chosen RF control signals to the control unit. The control unit further at least includes a receiver adapted to receive the RF control signals, and the cable tension detector indicates that a watercraft has reached a buoyant level when the tension in the lift cables fall below a predetermined threshold.

Abstract: A lifting arrangement for lifting boats 2 off the water and for putting boats 2 onto the water is provided, which comprises a crane 8, 9, 27 and pallets or cassettes 16 to be arranged under the hull of a boat 2 to be lifted or put down, connected to the crane. These lifting elements can be lowered below the floating boat, with preferably centering elements 41, 42 being provided for aligning the boat 2 in reference to a lifting element 16 positioned underneath.

Abstract: An apparatus is described for use in stabilizing a watercraft such as a kayak or canoe during boarding and exiting the watercraft. The apparatus includes a pair of spaced pontoons having above-water surface areas, below-water surface areas, inner sides, and lengths equal to from about 0.25 to about 1.0 times the length of the watercraft. The pontoons are joined in a spaced, parallel relationship by horizontal supports having lengths approximately equal to the width of the watercraft. The supports are transverse to the longitudinal axes of the pontoons and having opposed outer ends attached to the pontoons, e.g., to the below-water areas of the pontoons, whereby the supports are below water level when the apparatus is resting on the surface of the water. The apparatus preferably also includes rollers or support saddles mounted on the supports to facilitate movement of the watercraft onto and off of the apparatus.

Abstract: A module for a boat lift that combines features of both pontoon type and modular type constructions. Each module includes upper and lower pontoons, and can be connected in-line to form one side of a lift, and in parallel to form opposed sides of a lift. A typical lift includes four modules connected with two on each side.

Abstract: The pontoon boat lift system comprises a plurality of lifts mounted to an underside of a deck of the pontoon boat. Each lift comprises a leg that pivotally mounted to the underside of the deck and is moveable between a raised position and a lowered position. A free end of each leg includes its own support pad that contacts, for example, a lake bottom when the legs are in the lowered position. The operation of the lifts is coordinated to raise the pontoon boat above the surface of the water at desired shoreline locations.

Abstract: A boat lift of the type that is mounted on the pilings of a boat slip or dock having four pilings placed in a rectangular arrangement is provided. The boat lift includes a cradle upon which the hull of a boat is adapted to rest. A structure for raising and lowering the cradle is provided and a cable connects the cradle to the structure for raising and lowering the cradle. A drive unit is operatively associated with the structure for raising and lowering the cradle and includes a motor having an output shaft adapted to drive the drive unit such that upon operation of the motor, the cradle is raised or lowered.

Abstract: A cradle assembly for moving and positioning an item with respect to a support module in a storage assembly with the item including a bottom. The cradle assembly comprises a plurality of cradle beams, at least one cradle wall vertically extending upward from the plurality of cradle beams, and at least one stanchion vertically extending upward from one of the cradle beams. A padded support is operatively attached to the stanchion and positioned to engage the bottom of the item as a cradle assembly moves the item with respect to the support module. A positioning system is operatively connected to the padded support to horizontally and vertically position the padded support with respect to the plurality of the cradle beams to selectively engage the bottom of the item. Each stanchion and padded support includes a reciprocal stanchion and padded support, wherein positioning system selectively spaces the reciprocal padded supports from each other a width that is less than the width of the item being transported.

Abstract: A marine vessel, typically a power boat, lifting system includes a remotely operated transmitter module, a receiver module, a level sensing module, a motor control module, and motors are integrated to automatically position a cradle to the desired position relative to the waterline of the marine vessel. The lifting system is initialized by a signal input, a button pushed and released, from either the remote transmitter or the motor control module to begin movement of the lifting cradle to a desired position. The received signal initiates the motors, and a light to indicate energized motors through a visual signal, to move in the desired direction, either lifting or lowering the cradle. The level sensing module returns a signal to the motor control module to terminate the motors, and thus the visual indicator, when the desired cradle position has been reached.

Abstract: A boat lift braking system includes a threaded shaft driven by the boat lift motor. A torsion tube disposed about the shaft carries an interiorly threaded nut that interengages the peripheral threads of the shaft. A rotor is mounted to the nut adjacent a brake pad that is supported by a ratchet component. A pawl mechanism cooperates with the ratchet component for limiting rotation of the ratchet component in a first direction and permitting rotation of the ratchet component about the shaft in a second direction. The torsion tube is connected through a reduction apparatus to the winder of the boat lift. When the lift is at rest, a torsion spring drives the torsion tube and rotor against the brake pad and the ratchet component interlocks with the pawl mechanism to hold the lift at a desired elevation. When the motor is driven to lower the lift, the shaft is driven within the torsion tube such that the rotor momentarily disengages the pad.

Abstract: An assembly for lifting a boat locatable adjacent a dock requires only two elongate vertically disposed pilings each having a lower end portion mounted into the floor of a body of water near the dock and an upper end portion extending upwardly adjacent the dock. A lift is connected to a boat cradle for moving the cradle substantially vertically and includes a piston/cylinder attached between the dock and cables, which are mounted to each piling and are connected between the piston and the cradle. The piston is movable between a first position for lifting and pulleys and guides are mounted to the pilings and the cradle.

Abstract: A boatlift leg and frame structure utilizing a ball screw lifting mechanism driven by a reversible electric motor to raise and loser a boat support carriage. The raising and lowering operation of the ball screw mechanism is controlled by electronic circuitry that includes wired and remote direction selection; lifting logic with conflict detection and direction reversal delay; lighting control logic; motor power control; and overload detection logic to detect lifting overload and disable power to the motor power control. A drive train mechanism converts high-speed low torque rotation of the motor drive shaft to low-speed high-torque rotation drive of the ball screw. A boatlift leveling mechanism associated with one or more legs of the boatlift includes a ground engaging footpad, an extendible leg, a height adjusting screw mechanism and a height adjusting actuator with mating bevel gears coupled to the height adjusting screw for allowing adjustment through the side of a boatlift leg.

Abstract: Apparatuses and methods useful for helping to center watercraft—such as personal watercraft, ski boats, fishing boats, luxury boats, and the like—as they are docked (such as on trailers or watercraft-lifting systems), especially in rough waters and/or strong crosswinds.

Abstract: The pontoon boat lift system comprises a plurality of lifts. Each lift is comprised of a channel that mounts to deck support members of the boat. A leg is pivotally mounted to one end of the channel. A screw supported in the channel is turned by a connection to an electric motor. A threaded follower on the screw travels along the screw when it is rotated by the motor. A fulcrum arm connects between the threaded follower and the leg to transmit a longitudinal movement of the follower into a pivotal movement of the leg. The leg is thus moveable between a raised and a lowered position. The operation of the lifts is coordinated to raise the pontoon boat above the surface of the water at desired shoreline locations.

Abstract: A floating low profile watercraft lifting apparatus comprises a buoyant support apparatus and a watercraft lift attached to the buoyant support apparatus. Embodiments of the lift have first and second cantilever arms pivotally mounted to a base at offset pivot points for use in shallow water. The lift includes an actuator connected to the first and second cantilever arms and operable to move the first and second cantilever arms between a collapsed configuration and an extended configuration with uniform application of force and a minimum amount of travel of actuator components. Embodiments of the support apparatus comprise pontoons within a frame attached to the lift and providing buoyant support for the lifting apparatus.

Abstract: A boatlift assembly having a boat cradle portion and a canopy portion. The canopy portion and boat cradle portion are movably coupled to cause the canopy portion to be automatically raised when the boat cradle is lowered and to be automatically lowered when the boat cradle is raised.

Abstract: The pontoon boat lift system comprises a plurality of lifts. Each lift is comprised of a channel that mounts to deck support members of the boat. A leg is pivotally mounted to one end of the channel. A screw supported in the channel is turned by a connection to an electric motor. A threaded follower on the screw travels along the screw when it is rotated by the motor. A fulcrum arm connects between the threaded follower and the leg to transmit a longitudinal movement of the follower into a pivotal movement of the leg. The leg is thus moveable between a raised and a lowered position. The operation of the lifts is coordinated to raise the pontoon boat above the surface of the water at desired shoreline locations.

Abstract: A system for transferring a vessel between a first body of water having a first water level and a second body of water having a second water level includes a barrier separating the first body of water from the second body of water. The system also includes a transfer structure adjacent the barrier for receiving the vessel to be transferred between the first and second bodies of water, and a transfer apparatus adjacent the barrier for moving the transfer structure between a first position and a second position. The upper portion of the barrier includes a barrier door that is movable between an opened position when the transfer structure is in the second position to allow the vessel to move into and out of the transfer structure, and a closed position when the transfer structure is in the first position.

Abstract: A boatlift assembly having a boat cradle portion and a canopy portion. The canopy portion and boat cradle portion are movably coupled to cause the canopy portion to be automatically raised when the boat cradle is lowered and to be automatically lowered when the boat cradle is raised.

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 present invention relates to a boat lift including a base structure a cradle connected with the base structure and configured to support a boat, and a plurality of pontoons connected with the base structure for floating the boat lift on a water surface. The pontoons include a plurality of modular floats such that boats of varying weights are lifted and boats of varying centers of gravity are lifted levelly. The present invention also relates to a method of employing the boat lift.

Abstract: An apparatus for lifting and storing a boat above water and particularly for shallow water, is made up of a pair of laterally spaced floats fixedly secured to inner ends of a pair of beams whose outer ends are pivotally secured to a dock, a set of fixed posts, a bulkhead or other fixed structure. The floats and beams form a well having an entrance away from which is mounted a rear bar and further away from the rear bar and on the beams is mounted a front bar. A boat mounting frame onto which a boat can be driven under its own power is pivotally mounted on the rear bar such that after a boat is loaded on the boat mounting frame, the frame can be tilted such that its leading end engages the front bar and maintains the boat above the water in a position suited for storage. A method of forming the apparatus and a kit containing the apparatus is also disclosed.

Abstract: A device for preventing the tangling or crossing of lift cables by maintaining the tension on the lift cables. When the tension is removed from lift cables (4) by placing a boat in a water body, the cables (4) become slack and can cross and/or tangle at a winderbar (1), which greatly reduces the life of the cables (4) and can cause serious damage to boatlift and boat. The present invention applies a tensioning means to the cables (4) by utilizing a weight (10) and pulley (9) or a spring (15) attached to an end of the lift cable (4). Lift cables (4) are first attached at one end to the winderbar (1). The cables (4) are then fed through the cradle (13). When using the weight (10) and pulley (4) system, the cables (4) are placed over a pulley (9) so that the weight (10) attached to the opposite end of the cable (4) maintains tension on the cables (4). The spring (15) tension means attaches the tag end of the cable (5) to the windbar (1) and the opposite end of the cable (4) is attached to a spring (15).

Abstract: A boatlift buoyancy system for assisting in maneuvering a boatlift while in the water by adding buoyancy to the boatlift. The boatlift buoyancy system includes a first tube and a second tube attachable to the horizontal support beams of a boatlift that are capable of receiving of volume of air and/or water. A first hose and a second hose are fluidly connected to the first tube and second tube respectively for delivering pressurized air when buoyancy is desired for the boatlift. The first tube and the second tube also have a first aperture and a second aperture respectively within lower portions thereof for allowing for the draining of water when pressurized air is input into the tubes.

Abstract: Novel cable tie-off devices for watercraft lift assemblies are disclosed and claimed herein. In certain embodiments, the cable tie-off devices are mounted onto the vertical pilings of the watercraft lift assembly without the use of bolts or other fasteners that directly penetrate the outer surface of the vertical pilings.

Abstract: The pontoon boat lift system comprises a plurality of lifts. Each lift is comprised of a channel that mounts to deck support members of the boat. A leg is pivotally mounted to one end of the channel. A screw supported in the channel is turned by a connection to an electric motor. A threaded follower on the screw travels along the screw when it is rotated by the motor. A fulcrum arm connects between the threaded follower and the leg to transmit a longitudinal movement of the follower into a pivotal movement of the leg. The leg is thus moveable between a raised and a lowered position. The operation of the lifts is coordinated to raise the pontoon boat above the surface of the water at desired shoreline locations.

Abstract: A device secured to a submersible portion of a boat lift to stabilize the submersible portion of the boat lift from unwanted lateral movement. Elongated pipe-like devices are attached to a submersible portion of a boat lift in proximity to a piling. The device is mounted to the submersible portion of a boat lift so that movement caused by wind, wave, or current action that would force the submersible boat lift into lateral motion will be stopped by the pipe-like device, which comes into contact with the piling before the lateral motion becomes so large as to be undesirable.

Abstract: An adjustable stanchion assembly for a large capacity boat lift includes a pair of guides, namely mounting channels that are attached to respective sides of a cradle beam. Each mounting channel slidably receives an elongate stanchion element. The positioning of the stanchion element within its respective mounting channel is selectively adjusted. A bunk member is attached to and extends between upper ends of the stanchion elements. The bunk member is pivotably connected to the stanchion elements so that the angle of the bunk member may be adjusted.