A lifting column has five column elements that are arranged in a nested manner, at least in portions, as well as a first screw drive for the movement of the three innermost column elements relative to one another and a second screw drive for the movement of the three outermost column elements relative to one another. A coupling tube arrangement is provided which operatively connects the first screw drive with the second screw drive.

A lifting column has five column elements that are arranged in a nested manner, at least in portions, as well as a first screw drive for the movement of the three innermost column elements relative to one another and a second screw drive for the movement of the three outermost column elements relative to one another. A coupling tube arrangement is provided which operatively connects the first screw drive with the second screw drive.

A lifting column includes at least five column elements which are at least partly nested, and a first and a second drive arrangement. The first drive arrangement is configured to move the three innermost column elements relative to one another. The second drive arrangement is configured to move the three outermost column elements relative to one another.

A lifting column includes at least five column elements which are at least partly nested, and a first and a second drive arrangement. The first drive arrangement is configured to move the three innermost column elements relative to one another. The second drive arrangement is configured to move the three outermost column elements relative to one another.

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.

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.

To achieve a mechanism that supports an article at a desired position in a displaceable manner in accordance with a weight of the article with a simple, small, and lightweight structure. An article supporting device 1 includes a base member 2, a supporting member 3, a spring member 4 which is a compression coil spring, a spring force transmission member 5, a cam member 6, and a cam follower member 7. The cam follower member is pressed against a downward-facing cam surface 15 of the support member, an upward-facing cam surface 18 of the spring force transmission member, and a sideward-facing cam surface 22 of the cam member by a load of an article and a spring force of the spring member. The downward-facing cam surface and upward-facing cam surface are inclined in reverse directions to each other and disposed opposite to each other with the cam follower member interposed therebetween. A pressing force of the sideward-facing cam surface against the cam follower member includes a vertical direction component depending on a height position of the supporting member. The downward-facing cam surface, upward-facing cam surface, and sideward-facing cam surface are designed such that, in a moving range of the support member, the load, spring force, and pressing forces of the respective cam surfaces against the cam follower member are in equilibrium about the cam follower member.

A system and method for raising a structure, or part thereof, the system comprising vertical jack members connected and disposed about a rail system attached about the periphery of the structure. The vertical jack members comprise an outer sleeve and a slidable inner portion that is driven vertically by a jack screw and drive block. Extensible diagonal cross-braces stabilize the jack members and structure being raised.

A system and method for raising a structure, or part thereof, the system comprising vertical jack members connected and disposed about a rail system attached about the periphery of the structure. The vertical jack members comprise an outer sleeve and a slidable inner portion that is driven vertically by a jack screw and drive block. Extensible diagonal cross-braces stabilize the jack members and structure being raised.

A jacking device for lifting and supporting earthmoving equipment or vehicles, the jacking device including: a base; a jacking leg mounted to the base, the jacking leg for lifting a load to an elevated position; a top plate mounted to the jacking leg, the top plate for engaging the load; and, a support member mounted directly or indirectly to the base, wherein the support member is positionable to engage the top plate and thereby provide additional support to the load in the elevated position.