A screw jack with a lead screw that disengages from a traveling nut to prevent overdrive directly coupled to an electric motor though a series of planetary gears. A battery adapter mounted on an outer tube of the jack for attachment of a user's selected battery to the motor. A lift accessory with two lifting points, one a hook and the other a channel, bolted to a support bracket attached to an outer tube of the jack. A hanging accessory with toggle clamps at opposite ends of a beam for suspending the jack such as from a roll cage of an ATV.

Disclosed is a top-driven jack, including an outer pipe, an inner pipe, a lead screw, a nut, a fixed part, and a handle; the inner pipe extends into the outer pipe; the nut is fixedly mounted on the inner pipe; the lead screw is movably mounted in the outer pipe through the fixed part and extends into the inner pipe, and is engaged with the nut; the fixed part includes a fixed seat and a movable sleeve; a connecting hole and an accommodating hole are formed in the movable sleeve; a connecting section is arranged at one end of the lead screw; the movable sleeve is movably connected with the fixed seat and embedded into the connecting hole through the connecting section and synchronously moves with the lead screw in the circumferential direction around the central line of the lead screw.

Disclosed is a top-driven jack, including an outer pipe, an inner pipe, a lead screw, a nut, a fixed part, and a handle; the inner pipe extends into the outer pipe; the nut is fixedly mounted on the inner pipe; the lead screw is movably mounted in the outer pipe through the fixed part and extends into the inner pipe, and is engaged with the nut; the fixed part includes a fixed seat and a movable sleeve; a connecting hole and an accommodating hole are formed in the movable sleeve; a connecting section is arranged at one end of the lead screw; the movable sleeve is movably connected with the fixed seat and embedded into the connecting hole through the connecting section and synchronously moves with the lead screw in the circumferential direction around the central line of the lead screw.

The present disclosure discloses a height quickly-adjustable jack, including a telescopic component and a load-bearing component. The telescopic component is provided with a limiting plate, an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe, and the inner pipe is movably connected with the outer pipe along a center line of the outer pipe. The outer pipe has a hexagonal pipe structure. The limiting plate is fixedly mounted outside the outer pipe and is only connected with one of side surfaces. An extension direction of the limiting plate on the outer pipe is parallel to the center line of the outer pipe. The limiting plate is provided with limiting holes. The load-bearing component is movably mounted on the outer pipe.

The present disclosure discloses a height quickly-adjustable jack, including a telescopic component and a load-bearing component. The telescopic component is provided with a limiting plate, an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe, and the inner pipe is movably connected with the outer pipe along a center line of the outer pipe. The outer pipe has a hexagonal pipe structure. The limiting plate is fixedly mounted outside the outer pipe and is only connected with one of side surfaces. An extension direction of the limiting plate on the outer pipe is parallel to the center line of the outer pipe. The limiting plate is provided with limiting holes. The load-bearing component is movably mounted on the outer pipe.

A stabilizer for a recreational vehicle includes a first support structure, a second support structure, and a locking mechanism. The first support structure includes an outer tube. The second support structure includes a casing, side support bars, and connecting rods. The casing selectively moves in a first direction of a first end of the outer tube or in a second direction of a second end of the outer tube. The locking structure includes a first limit member and a second limit member. The second limit member is selectively abutted against the first limit member, so as to lock a degree of freedom of the casing in the first direction.

A stabilizer for a recreational vehicle includes a first support structure, a second support structure, and a locking mechanism. The first support structure includes an outer tube. The second support structure includes a casing, side support bars, and connecting rods. The casing selectively moves in a first direction of a first end of the outer tube or in a second direction of a second end of the outer tube. The locking structure includes a first limit member and a second limit member. The second limit member is selectively abutted against the first limit member, so as to lock a degree of freedom of the casing in the first direction.

A jack assembly includes a telescoping body, a jackscrew adapted to extend and retract the telescoping body, and a drive train adapted to drive the jackscrew. The drive train includes (a) a first drive shaft adapted for connection to a handle, and (b) a second drive shaft adapted for connection to a power drill. The second drive shaft includes a torque limiter and a gear reduction section. The jack assembly is used in a related method of driving the jackscrew of a jack assembly.

A jack assembly includes a telescoping body, a jackscrew adapted to extend and retract the telescoping body, and a drive train adapted to drive the jackscrew. The drive train includes (a) a first drive shaft adapted for connection to a handle, and (b) a second drive shaft adapted for connection to a power drill. The second drive shaft includes a torque limiter and a gear reduction section. The jack assembly is used in a related method of driving the jackscrew of a jack assembly.

Maneuverable ergonomic trailer stands are disclosed. An example portable trailer stand includes: an elongate upper ledge, a post coupled to the upper ledge, an extendible leg telescopically coupled to the post, the upper ledge being vertically movable to selectively engage and disengage an underside of a trailer based on movement of the extendible leg relative to the post, and a plurality of wheels coupled to the post, the post to maintain the plurality of wheels at a substantially fixed distance from the upper ledge as the upper ledge is vertically moved, each of the plurality of wheels to be equidistant from a vertical axis traversing through a center of the upper ledge.