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.

The invention relates to a crane comprising a tower and a jib, wherein the jib rests on the tower and is fixed on the tower when the crane is in an inoperative position.

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 that performs a hanging operation by connecting a jib to a boom, includes: a plurality of jib divided bodies into which the jib is divided; a plurality of support rope divided bodies into which a support rope supporting the jib is divided, and which are respectively installed on the jib divided bodies in a step before assembling; a connection body which connects the support rope divided bodies to each other; and a fixed support member which detachably supports the support rope divided body and the connection body on the jib divided body, in which the fixed support member can hold the jib divided body connected to the boom, in a state of being hung by the connected support rope divided body.

This automatic unfolding and folding tower crane comprises a mast and a jib which are movable between an operation configuration and a transport configuration.

The mast has a first mast section (2.1) and a second mast section (2.2). The jib has a first jib section (4.1) and a second (4.2) jib section. The first jib section (4.1) has an upper limit (4.11) and a lower limit (4.12) defining a height (H4.1) of the first jib section (4.1). The first mast section (2.1) is rotatably connected to the first jib section (4.1) about a hinge axis (Y24).

The jib direction (X4) is shifted with respect to the mast direction (Z2) parallel to the hinge axis (Y24). A distance between the hinge axis (Y24) and the lower limit (4.12) is greater than 75% of the height (H4.1) of the first jib section (4.1).