Liebherr-werk Ehingen Gmbh

Rudolf Becker

Hans-Dieter Willim

Uwe Frommelt

The invention relates to a mobile crane comprising a lower vehicle and an upper vehicle turningly mounted thereon and bearing a telescoping boom with a luffing cylinder for the pivoting thereof. The telescoping boom comprises two parts able to be bolted together and each having an external tube, from which respectively at least one telescope member may be extended.

Mobile crane

A mobile crane is disclosed which comprises a telescopic boom, which is pivoted to the rotating superstructure or rotating deck of the crane and is adapted to be luffed by a luffing cylinder, which is pivoted to the boom and the rotating deck. A guying yoke is pivoted on the rear of the telescopic boom near the middle of its base box. Two axially aligned spaced apart rope pulleys are rotatably mounted at the outer end of the guying yoke. A reversing rope pulley is provided adjacent to the top end of the telescopic boom. Also, a winch is provided with a rope, which serves to guy the telescopic boom and extends around one rope pulley of the guying yoke to the upper reversing rope pulley and back around the other rope pulley of the guying yoke to a fixed point. The winch and the point to which the rope is fixed are disposed on mutually opposite sides of the telescopic boom adjacent to the pivotal axis of the boom. The guying yoke is restrained by a hydraulic piston-cylinder unit, which is pivoted at one end to the guying yoke above the pivotal axis of the latter and is pivoted at the other end to the base box near the middle thereof between the pivotal axes of the guying yoke and the telescopic boom.

Mobile crane comprising a telescopic boom

A separate boom vehicle is provided for transporting a telescopic boom, which is adapted to be coupled to a revolving superstructure and to be detached from it for transporting. The boom vehicle is provided in its forward portion with a coupling structure for retaining a telescopically extensible part of the telescopic boom, and is provided in its rear portion with a lifting structure for supporting the boom. The lifting structure is so arranged that when it has been longitudinally aligned with the revolving superstructure, a coupling yoke, provided at the lower end of the telescopic boom, is adapted to be displaced by extending and retracting cylinders along tracks provided on the revolving superstructure to a position in which bearing eyes of the telescopic beam register with bearing bores of the revolving superstructure. The revolving superstructure is provided with a pivot pin for coupling the boom to the revolving superstructure.

Telescopic crane for heavy loads

In a heavy-duty crane particularly suitable for lifting heavy loads over tall buildings, a substructure supports a rotatable main boom. A jib for carrying the load and a secondary spar for carrying a counterweight by means of a cable are hinged to the tip of the main boom. The counterweight swivels together with turning of the loaded crane. The jib is guyed by way of the secondary spar which overhangs so far that the counterweight is disposed beyond the confines of the substructure.

Growing community of inventors

Ehingen/Donau, Germany

Rudolf Becker