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.

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.

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 power unit (or a hydraulic floor jack) includes a rectangular frame with side flanges and has a tubular handle enclosing a control shaft and a control knob. A pivotal lifting mechanism is mounted on the frame including a pair of parallel lift arms having rearward ends interconnected by a lateral push bar. The forward ends (with the bridge) are rotatable upward for lifting a load as the push bar is translated forward within a pair of U channels tracks attached to the inner side flanges. A hydraulic cylinder has a ram for pushing the lateral push bar forward along the tracks for raising the forward ends of the lift arms, and has a releasable control valve for retracting the ram to lower the forward ends of the lift arms. The safety mechanism includes a toothed rack bar secured in the vertical wall of the racks. The lateral push bar has bore holes in the ends thereof. A cylindrical dog is slidably supported within each of the bore holes ad has a proximal end that is extendable for engaging a tooth of the rack bar. The dogs are biased into the extended position, and include release cables and linkage for releasing the dogs from the rack bar by rotating the control knob counter-clockwise.

A power unit (or a hydraulic floor jack) includes a rectangular frame with side flanges and has a tubular handle enclosing a control shaft and a control knob. A pivotal lifting mechanism is mounted on the frame including a pair of parallel lift arms having rearward ends interconnected by a lateral push bar. The forward ends (with the bridge) are rotatable upward for lifting a load as the push bar is translated forward within a pair of U channels tracks attached to the inner side flanges. A hydraulic cylinder has a ram for pushing the lateral push bar forward along the tracks for raising the forward ends of the lift arms, and has a releasable control valve for retracting the ram to lower the forward ends of the lift arms. The safety mechanism includes a toothed rack bar secured in the vertical wall of the racks. The lateral push bar has bore holes in the ends thereof. A cylindrical dog is slidably supported within each of the bore holes ad has a proximal end that is extendable for engaging a tooth of the rack bar. The dogs are biased into the extended position, and include release cables and linkage for releasing the dogs from the rack bar by rotating the control knob counter-clockwise.

A collapsible hoisting device for use in the construction of large metal containers and to a removable accessory applicable thereto. It facilitates construction procedures by reducing project times and costs. The collapsible device includes a column (2) along which respective upper bodies (6) and lower bodies (7) that have been inserted into said column (2) move. The bodies (6, 7) are linked by an extendable means (8). The upper bodies (6) and lower bodies (7) have a corresponding mechanism to lock or attach (9) to the column (2), The column (2) is mounted so that it pivots with respect to a base (1) and the upper body (6) has a housing (609) suitable for the insertion of a removable, fingernail-shaped accessory (12).

A collapsible hoisting device for use in the construction of large metal containers and to a removable accessory applicable thereto. It facilitates construction procedures by reducing project times and costs. The collapsible device includes a column (2) along which respective upper bodies (6) and lower bodies (7) that have been inserted into said column (2) move. The bodies (6, 7) are linked by an extendable means (8). The upper bodies (6) and lower bodies (7) have a corresponding mechanism to lock or attach (9) to the column (2), The column (2) is mounted so that it pivots with respect to a base (1) and the upper body (6) has a housing (609) suitable for the insertion of a removable, fingernail-shaped accessory (12).

Heavy equipment is attached to slings and lifted by rollers raised and lowered in a structure with four pillars. Rollers prevent torque and provide vertical vectors. Roller axle supports move along the pillars. Two gantry crane frames are joined by cross and truss beams. Hydraulic jacks and pneumatic locks are controlled and sensed movements are communicated to processors for each pillar. One master processor communicates with a remote control. Sensors check lock and hydraulic cylinder position and allow roller movements only when positions are correct and all processors agree.