A lifter assembly includes a base having a top and a bottom surface. Connectors are attached to the base extending outwardly from the bottom surface. Each of the connectors includes at least one rail wheel rotatably attached thereto. The base includes traveling wheels rotatably attached thereto. A post is attached to the base extending outwardly from the top surface to a distal end. An arm is disposed on the distal end, rotatably attached to the post, extending outwardly to a terminal end. A support is movably attached to the arm and extends outwardly to a support end. A trolley is slidably disposed on the arm and movable along the arm between the terminal end and the post. Each of the traveling wheels includes a leg pivotably attached to the base connecting the traveling wheel to the base and move the traveling wheel between a transport and a storage position.

A lifting unit includes a jib foot forming a proximal part of a jib in a service configuration, a counter jib supporting a balancing ballast, a securing part between the jib foot and the counter jib to secure the lifting unit to a mast, and a cylinder connected to the jib foot such that the jib foot is movable between a lowered position and a lifted position. A second cylinder is connected to the securing part.

A modular crane, with a pot-shaped element on which an upper carriage of the crane can be mounted such that it can rotate about a rotational axis, multiple support carriers hinged to the pot-shaped element such that they can each pivot about a pivot axis for support on the ground, and a separable driving base on which the pot-shaped element can be secured.

A coupling portion of a lower travelling body of a mobile crane is arranged such that, in plan view, a right front straight line, which passes through any point included in a front load receiving surface and through any point included in a right front load transmission surface, passes through a right front end roller or a point on the front side relative to the right front end roller and that a left front straight line, which passes through any point included in the front load receiving surface and through any point included in a left front load transmission surface, passes through a left front end roller or a point on the front side relative to the left front end roller.

A backstop to prevent contact between a spacer and a peripheral member includes a rear jib backstop for a crane, having an outer cylinder, an inner cylinder, a spacer, a spacer holder and a lock mechanism. The spacer holder supports the spacer pivotally and swingably about an axis thereof and allows the spacer to fit on the inner cylinder, to keep the rear jib backstop from contracting in accordance with a change in a posture of the rear jib backstop when a boom rises. The lock mechanism enables locking of the spacer in such a manner as to keep the spacer from swinging about a swing central axis in a state where the spacer is located away from an outer surface of the inner cylinder.

A crane includes: a boom; a jib; a front post that is swingably attached to a tip end side of the boom; a rear post that is swingably attached to the tip end side of the boom; a post-side pendant member, with one end of the post-side pendant member being attached to a tip end of the rear post; a boom-side pendant member, with one end of the boom-side pendant member being attached to another end of the post-side pendant member, and another end of the boom-side pendant member being attached to the boom; and a post driving device having a link mechanism that rotates the rear post in a range including a position at which the rear post is swung down to the front post side and a position at which the rear post is swung down to the boom side, while the boom is held down in a horizontal position.

A system for quick coupling and uncoupling of a tracked unit with respect to a chassis of a tracked machine, particularly a tracked pipe laying machine, includes at least two supporting structures, configured to be associated with a chassis of a tracked machine. Each one of the two supporting structures includes at least one fixed pin and at least one pin that can move axially along its own longitudinal axis, and at least two coupling devices, configured to be associated with a tracked unit, wherein each coupling device has at least one hook and at least one slot.

In a configuration for coupling the tracked unit to the chassis, the hook is mated with the fixed pin and the movable pin is inserted in the slot.

The invention relates to an apparatus for assembling and disassembling a mobile crane boom, in particular a telescopic boom, that comprises a support device that is attached or attachable to the mobile crane and/or to a transport vehicle on which the boom can be placed and fixed or locked, a roller cart on which the boom can be placed and that is movably stored or storable on the transport vehicle, and a guide mechanism that is attached or attachable to the transport vehicle and by means of which the roller cart is actively movable in parallel with the longitudinal axis of the boom. The invention further relates to a mobile crane having an apparatus in accordance with the invention and to a method of assembling a boom stored on a transport vehicle to a mobile crane using the apparatus in accordance with the invention.

A portable lift may attach to a hitch of a vehicle. The portable lift may include an attachment member configured to engage the hitch. An elevation member may include a proximal end and a distal end opposite the proximal end. The proximal end of the elevation member may be connected to the attachment member. A platform may be slidably disposed on the elevation member. A pulley may be disposed nearer the distal end than the proximal end of the elevation member. A winch may be configured to move the platform up and down on the elevation member. The winch may include a cable connected to the platform and engaging the pulley.

This invention relates to a crane comprising an undercarriage and a turntable rotatable with respect to the undercarriage with a counterweight and a mounting point for the attachment of a winch, wherein the counterweight includes at least one winch pick-up means for the temporary attachment of a winch to be mounted on the turntable, wherein the winch can be attached to the winch pick-up means such that the winch can be pivoted about a vertical axis.