A novel jack system that eliminates structures likely to fail that are common in other jack systems and includes a variety of attachments that allow the system to raise objects that are lower to the ground or higher off the ground than traditional jacks can accommodate. The system includes a locking mechanism that transfers the weight lifted by the jack to a central main support shaft. The system includes attachments that allow a user to lift a marine vessel such as a personal watercraft, an object that has fallen on the ground such as a trailer, and/o the front of a vehicle such as a lawnmower. The attachments are interchangeable and adjustable in height and position.

The present invention provides a furniture jack that can be self-locking, labor-saving and easily portable, including: the bottom plate, the bottom plate is fixed with a straight bar, the moving plate is provided on the bottom side of the bottom plate, the top of the moving plate is fixed with a shell, the internal rotation of the shell is connected with a worm. The invention provides a self-locking, labor-saving, convenient to carry, the furniture jack, driven by turning the grip of the handle and the worm, make a lever between the handle and the worm, operation, and screw mechanical structure, without relative sliding, can be stable for large objects, to increase security, and after the end of the use, to receive the grip, reduce the space to carry, improve the user experience.

A pulley wheel support frame having a ring-shaped support rim having a top surface adapted to support a horizontal pulley wheel, said ring-shaped support rim being coupled, on a bottom side, to an opening adapted to receive a ram or a saddle of a jack; a base; and three or more height-adjustable support columns coupling the base to the ring-shaped support rim, said height-adjustable support columns each being fixable at a plurality of different heights.

A jack support apparatus has an outer tube having an outer tube body with an outwardly-extending outer tube jack cradle and an opposite outer tube opening, an inner tube having an inner tube body with a plurality of spaced-apart inner tube holes and an outwardly-extending inner tube jack cradle, the inner tube body slidably received within the outer tube body through the outer tube opening, the outer and inner tube jack cradles configured to each selectively engage one of the wheel axle and the cup axle of the jack, and a pin operable through an outer tube hole for selectively engaging any of the plurality of inner tube holes.

A lifting and lowering tool includes a foot configured to be supported on a surface, a bar extending therefrom, and a movable assembly including a housing, a movable platform shaped to support a load that extends from the housing, a lifting actuator configured to incrementally move the movable assembly along the bar away from the foot, a lowering actuator configured to incrementally move the movable assembly along the bar towards the foot, and a release actuator configured to disengage the movable assembly from the bar to allow free movement of the movable assembly along the bar. In embodiments, the movable assembly engages the bar through locking plates that extend through a flange of the movable assembly. In embodiments the release actuator is spaced from the lifting actuator and the lowering actuator to prevent inadvertent actuation of the release actuator. In embodiments a flange of the movable assembly surrounds the bar.

A lifting and lowering tool includes a foot configured to be supported on a surface, a bar extending therefrom, and a movable assembly including a housing, a movable platform shaped to support a load that extends from the housing, a lifting actuator configured to incrementally move the movable assembly along the bar away from the foot, a lowering actuator configured to incrementally move the movable assembly along the bar towards the foot, and a release actuator configured to disengage the movable assembly from the bar to allow free movement of the movable assembly along the bar. In embodiments, the movable assembly engages the bar through locking plates that extend through a flange of the movable assembly. In embodiments the release actuator is spaced from the lifting actuator and the lowering actuator to prevent inadvertent actuation of the release actuator. In embodiments a flange of the movable assembly surrounds the bar.