Crane with Hoisting Cable Load-Dependent Load Torque Equalization

A crane comprising:

• a. a jib which is mounted on the crane structure so as to be rotatable about a bearing point,
• b. a counterweight arrangement which can be positioned variably in relation to the bearing point, and
• c. a hoisting cable which runs out from a hoisting winch and is guided via the jib,
• d. a counterweight adjustment device which is coupled to the counterweight arrangement for the variable positioning of the counterweight arrangement depending on the hoisting cable load, comprising
• i. a lever element which is mounted rotatably about a pivot point, which is arranged on the crane structure rearwardly with respect to the jib,
• ii. a coupling element which acts on the lever element and is connected to the counterweight arrangement,
• wherein
• e. two lever arms extend from the pivot point of the lever element, and the lever element is designed as a balancer,
• f. the counterweight adjustment device includes a hoisting cable guide which is arranged in the course of the hoisting cable between the hoisting winch and an upper jib section, having a first deflecting pulley arrangement which is mounted on the jib and a second deflecting pulley arrangement which is mounted on the lever element, wherein the hoisting cable is guided in an alternating manner via the first and the second deflecting pulley arrangement,), and therefore a deflection, induced by the hoisting cable load, of the lever element is transmitted to the counter weight arrangement in such a manner that an increase of the hoisting cable load brings about a rearwardly directed change in position and a reduction in the hoisting cable load brings about a forwardly directed change in position of the counter weight arrangement.