Provided is a crane assembling method which can easily assemble a crane. In the crane assembling method, a step of connecting an (n+1)th partial jib includes the steps of: placing a distal end of an nth partial jib connected to a boom on a pedestal on the ground; connecting an upper side connector on a proximal end of the (n+1)th partial jib to an upper side connector on the distal end of the nth partial jib in a state where the (n+1)th partial jib is lifted; mounting a wheel on the lower side connector on a distal end of the (n+1)th partial jib; and connecting a lower side connector of the nth partial jib and a lower side connector on a proximal end of the (n+1)th partial jib to each other by lifting the nth partial jib.

An automated collapsible tower crane comprising a mast with telescopic portions, a boom with boom sections articulated with each other by respective rotary joints, a boom folding system to unfold and fold the boom by the rotary joints wherein each proximal and distal rotary joint is associated with at least one hydraulic actuator to unfold and fold boom sections, a mast folding system to fold the mast down, wherein in the transport position the boom sections are folded down one on top of the other and on the mast, and the boom folding and unfolding system acts independently of the folding and telescoping system of the mast, and comprises hydraulic actuators to fold and unfold the boom sections.

The present invention relates to a crane with a height-adjustably mounted control or personnel stand that can be lifted and lowered by at least two lifting elements, wherein the two lifting elements are articulated to a balancing rocker that is mounted on a rocker bearing head connected to the control or personnel stand so as to be luffable about a horizontal pivot axis, wherein a monitoring and/or safety device is provided to monitor and/or ensure the safety of the control stand. According to the invention, the pivot axis is configured as a measurement axis for detecting the load state of the luffable bearing of the balancing rocker and for providing a load signal to the monitoring and/or safety device.

Method and apparatus for a portable hoisting system having an upright gin pole which is attached to the upright standing very tall pole or tower using a plurality of straps. Extending away from the gin pole is an angularly adjustable arm which is user selectable to be either; e.g., at a 90-degree angle or a 45-degree angle, which arm is supported by a brace connected between the extension arm and the upright gin pole. The gin pole is hollow on its inside which allows a load line to travel through the interior of the gin pole from its lower end to its upper outlet end and includes a plurality of pulleys which allow the load line to travel through the inside of the hoisting system. Also included is a heel block or the like wherein one end of the load line is connected to a capstand hoist disposed on the front or rear end of a vehicle and a ball with hook for supporting a load. Also included optionally is a tag line connected to the load line and being held by a ground member for helping to control the movement of the load.

A mobile crane is configured so that a boom is raised by a derrick cylinder in response to a raise signal output from a derrick lever and the derrick cylinder is stopped in response to the derrick angle of the boom reaching the maximum angle corresponding to the hoisted-down length of a rope.

The invention relates to a lifting device, in particular a mobile crane or a cable-operated excavator, having an apparatus for monitoring the raising and lowering procedures of a boom system of the lifting device.

Provided is a crane assembling method which can easily assemble a crane. In the crane assembling method, a step of connecting an (n+1)th partial jib includes the steps of: placing a distal end of an nth partial jib connected to a boom on a pedestal on the ground; connecting an upper side connector on a proximal end of the (n+1)th partial jib to an upper side connector on the distal end of the nth partial jib in a state where the (n+1)th partial jib is lifted; mounting a wheel on the lower side connector on a distal end of the (n+1)th partial jib; and connecting a lower side connector of the nth partial jib and a lower side connector on a proximal end of the (n+1)th partial jib to each other by lifting the nth partial jib.

Provided is a crane assembling method which can easily assemble a crane. In the crane assembling method, a step of connecting an (n+1)th partial jib includes the steps of: placing a distal end of an nth partial jib connected to a boom on a pedestal on the ground; connecting an upper side connector on a proximal end of the (n+1)th partial jib to an upper side connector on the distal end of the nth partial jib in a state where the (n+1)th partial jib is lifted; mounting a wheel on the lower side connector on a distal end of the (n+1)th partial jib; and connecting a lower side connector of the nth partial jib and a lower side connector on a proximal end of the (n+1)th partial jib to each other by lifting the nth partial jib.

A crane drive method is provided for selecting and applying a preferential load curve adapted to a work configuration of a crane having a mast supporting a luffing jib including at least one jib structural element. The method includes an inclination measurement step implementing a measurement of an actual inclination of the jib structural element with respect to a reference axis in the work configuration, a selection step implementing an automated selection of the preferential load curve according to the actual inclination of the jib structural element, the preferential load curve selected from among a plurality of load curves stored in a memory and calculated beforehand for several inclinations of the jib structural element, and a drive step implementing an application of the preferential load curve for maneuvers of lifting and moving a load along the luffing jib in the work configuration of the crane.

A crane drive method is provided for selecting and applying a preferential load curve adapted to a work configuration of a crane having a mast supporting a luffing jib including at least one jib structural element. The method includes an inclination measurement step implementing a measurement of an actual inclination of the jib structural element with respect to a reference axis in the work configuration, a selection step implementing an automated selection of the preferential load curve according to the actual inclination of the jib structural element, the preferential load curve selected from among a plurality of load curves stored in a memory and calculated beforehand for several inclinations of the jib structural element, and a drive step implementing an application of the preferential load curve for maneuvers of lifting and moving a load along the luffing jib in the work configuration of the crane.