A lifting column (3) for a lifting system (2) of a furniture is provided. The lifting column (3) comprises at least two tube portions (4, 5) displaceable with respect to one another like a telescope, a high-voltage direct-current motor (6) and a transmission (7) for transforming a rotational motion into a linear motion, wherein the high-voltage direct-current motor (6) and the transmission (7) are arranged inside at least one of the at least two tube portions (4, 5) displaceable with respect to one another like a telescope.

A lifting column (3) for a lifting system (2) of a furniture is provided. The lifting column (3) comprises at least two tube portions (4, 5) displaceable with respect to one another like a telescope, a high-voltage direct-current motor (6) and a transmission (7) for transforming a rotational motion into a linear motion, wherein the high-voltage direct-current motor (6) and the transmission (7) are arranged inside at least one of the at least two tube portions (4, 5) displaceable with respect to one another like a telescope.

An adjustment system including an adjustable support, a driving arrangement, a locking arrangement and a motor. The adjustable support includes a base including a bore having an open mouth; a screw being movable received in the bore while having a free end configured to project past the open mouth of the bore; and a driver being arranged in driving engagement with the screw, whereby a rotation of the driver results in a linear movement of the screw along the longitudinal extension of the bore. The driving arrangement includes a driver actuator arranged to be driven by the motor. Further, a method of orienting an element relative to a reference plane is provided.

An adjustment system including an adjustable support, a driving arrangement, a locking arrangement and a motor. The adjustable support includes a base including a bore having an open mouth; a screw being movable received in the bore while having a free end configured to project past the open mouth of the bore; and a driver being arranged in driving engagement with the screw, whereby a rotation of the driver results in a linear movement of the screw along the longitudinal extension of the bore. The driving arrangement includes a driver actuator arranged to be driven by the motor. Further, a method of orienting an element relative to a reference plane is provided.

A jack for lifting segments of a structure includes a pair of masts, a mast base, a mast cap, a hydraulic ram, a bottom bracket and a shuttle. The masts are identical and upright with a plurality of evenly spaced holes. The mast base supports the mast and the mast cap receives the upper ends of the masts and maintains the masts in a parallel, relationship. The hydraulic ram moves between a retracted position and an extended position with a stroke distance which is significantly less than the mast height. The bottom bracket is removably pinned to the masts and receives and supports the lower end of the hydraulic ram. The shuttle receives the upper end of the hydraulic ram. The bottom bracket and shuttle, when not pinned to the masts, can slide vertically up the masts. The shuttle includes features for connecting to a segment of a structure.

A jack for lifting segments of a structure includes a pair of masts, a mast base, a mast cap, a hydraulic ram, a bottom bracket and a shuttle. The masts are identical and upright with a plurality of evenly spaced holes. The mast base supports the mast and the mast cap receives the upper ends of the masts and maintains the masts in a parallel, relationship. The hydraulic ram moves between a retracted position and an extended position with a stroke distance which is significantly less than the mast height. The bottom bracket is removably pinned to the masts and receives and supports the lower end of the hydraulic ram. The shuttle receives the upper end of the hydraulic ram. The bottom bracket and shuttle, when not pinned to the masts, can slide vertically up the masts. The shuttle includes features for connecting to a segment of a structure.

Jack units attach skates to an object to be moved. Each jack unit has a tongue that slidably engages a coupling slot affixed to the object, and can be operated to raise or lower the tongue; when raised, the object is supported on the skates and can be rolled to a new location. A crane can attach to lift eyes on the jack units to allow the system to be lifted with the skates attached to the object, avoiding the risk to operators of positioning the skates under the object while it is suspended. Rotation-limiting structures can be selectively employed to block rotation of the trailing skates to facilitate steering when rolling the object supported by the system. The coupling slots can be provided in coupling elements which can attach directly to the object or which can be employed to form a freestanding frame to which the object is secured.

The present jack apparatus is particularly adapted for heavy duty lifting. The jack apparatus includes a base; a pair of screw jacks; a yoke supported by the screw jacks; a lifting tube supported on the yoke; a shaft coupler coupling the screw jacks; a power unit driving one of the screw jacks and through the shaft coupler also driving the other screw jack; and a housing covering the screw jacks and other components. The pair of screw jacks each have threaded lifting shafts designed to eliminate risk of unexpected lowering of the jack's lifting tube even if power is lost. A jack system is described including two or more of the jack apparatus controlled by a single control for simultaneous operation.

The present jack apparatus is particularly adapted for heavy duty lifting. The jack apparatus includes a base; a pair of screw jacks; a yoke supported by the screw jacks; a lifting tube supported on the yoke; a shaft coupler coupling the screw jacks; a power unit driving one of the screw jacks and through the shaft coupler also driving the other screw jack; and a housing covering the screw jacks and other components. The pair of screw jacks each have threaded lifting shafts designed to eliminate risk of unexpected lowering of the jack's lifting tube even if power is lost. A jack system is described including two or more of the jack apparatus controlled by a single control for simultaneous operation.

An easily attachable and removable self-contained slide in storage, safety and warning light chassis assembly for use by the traffic control industry and others is described. The chassis assembly includes a bed portion that is built to slide into a pickup truck bed. Associated removable jacks can be used to raise and support the chassis while a truck is backed up under it, or where the jacks include castors, the assembly is rolled into the truck. Additionally, a safety platform portion is included on the rear portion of the chassis assembly, so that when installed it is disposed behind the bed of the truck for use in the placement and pickup of traffic control devises. The chassis assembly can be mounted securely to the factory hitch of truck as well as additional locations in the bed.