A jack assembly including a telescopic column driven via a gear box, wherein: the gear box is coupled to a rotary input of a drive mechanism that extends and retracts the column; the gear box has only a single input gear and a single output gear that is coupled to the drive mechanism; and the input gear has a connector adapted to be engaged and driven by a portable, hand-held power tool. The invention also relates to a jack assembly with a gear box for use as a jockey wheel for attachment to a towed vehicle, to raise and lower a draw bar of the vehicle.

A jack assembly is shown and describe. The jack assembly may include a first tube having first and second end portions and a central portion between the first and second end portions, and a second tube positioned within the first tube and movable with respect to the first tube. The jack assembly may also include an expanded portion on the first tube, the expanded portion having a larger inner diameter than an inner diameter of the central portion, and a bushing attached to the expanded portion, where the bushing generally prevents contact between the first and second tubes.

A jack assembly is shown and describe. The jack assembly may include a first tube having first and second end portions and a central portion between the first and second end portions, and a second tube positioned within the first tube and movable with respect to the first tube. The jack assembly may also include an expanded portion on the first tube, the expanded portion having a larger inner diameter than an inner diameter of the central portion, and a bushing attached to the expanded portion, where the bushing generally prevents contact between the first and second tubes.

The invention relates to a vehicle jack 12 integrated into a chassis of a vehicle 10 and comprises two jack assemblies 12.1, 12.2 arranged in end-to-end fashion along each side of the vehicle. Each jack assembly includes an elongate drive screw 20 and a pair of legs 9, one of which is pivotally connected to a screw follower 22. In addition, the jack 12 Includes a drive mechanism 14 comprising a bevel gear arrangement which is drivingly connected to the respective drive screws 20. Upon actuation of the drive mechanism 14, the pairs of legs 9 are simultaneously, pivotally displaced relative to the chassis between a retracted position, in which the legs 9 are substantially aligned and disposed at least partially within or around the chassis, thereby not to adversely affect the ground clearance, and an extended position.

A jack assembly including a telescopic column driven via a gear box, wherein: the gear box is coupled to a rotary input of a drive mechanism that extends and retracts the column; the gear box has only a single input gear and a single output gear that is coupled to the drive mechanism; and the input gear has a connector adapted to be engaged and driven by a portable, hand-held power tool. A jack assembly with a gear box for use as a jockey wheel for attachment to a towed vehicle, to raise and lower a draw bar of the vehicle is also provided.

A jack assembly including a telescopic column driven via a gear box, wherein: the gear box is coupled to a rotary input of a drive mechanism that extends and retracts the column; the gear box has only a single input gear and a single output gear that is coupled to the drive mechanism; and the input gear has a connector adapted to be engaged and driven by a portable, hand-held power tool. A jack assembly with a gear box for use as a jockey wheel for attachment to a towed vehicle, to raise and lower a draw bar of the vehicle is also provided.

An extensible support foot (10) includes a first body (20) equipped with a support base (21), a second body (30) slidingly associated with the first body (20) and movable along a predetermined longitudinal direction towards or away from the support base (21), and means (40) for adjusting the distance between the second body (30) and the support base (21), the support foot (10) includes a weighing device (50) adapted for measuring a force acting on the second body (30) in the longitudinal direction (A).

A jack assembly is shown and describe. The jack assembly may include a first tube having first and second end portions and a central portion between the first and second end portions, and a second tube positioned within the first tube and movable with respect to the first tube. The jack assembly may also include an expanded portion on the first tube, the expanded portion having a larger inner diameter than an inner diameter of the central portion, and a bushing attached to the expanded portion, where the bushing generally prevents contact between the first and second tubes.

A jack assembly is shown and describe. The jack assembly may include a first tube having first and second end portions and a central portion between the first and second end portions, and a second tube positioned within the first tube and movable with respect to the first tube. The jack assembly may also include an expanded portion on the first tube, the expanded portion having a larger inner diameter than an inner diameter of the central portion, and a bushing attached to the expanded portion, where the bushing generally prevents contact between the first and second tubes.

A screw jack system with three (or more) stops that is capable of raising and lowering a substantially heavy load. Specifically, once the elevator sleeve travels through the case sleeve and is raised to its maximum height, the three (or more) inner stops of the elevator sleeve engage with the three (or more) outer stop channels of the case sleeve. These engagements are the stopping points of the screw jack which are the optimal points of support in order to prevent any lean from raising or lowering a heavy load or preventing any potential breaking points or sleeve pullout. Further, the screw jack system includes a pinion gear, drive gear, drive screw, elevator screw, and elevator tube that permit a user to covert rotational motion into linear motion in order to perform its desired raising and lowering functions.