Abstract: The invention is directed to a ring lift crane with a liftable ring forming a circular traveling path and having a plurality of segments which can be connected to one another. Within the ring, there is arranged a chassis having a superstructure which is connected with the chassis so as to be rotatable and which has a plurality of winches. The superstructure is provided with an adapter in each of two oppositely located end areas, and the adapters are supported in a rolling manner on the circular traveling path of the ring by rollers which are arranged in the end area of the adapters.

Abstract: An undercarriage for a track vehicle includes an endless track having links of constant length connected end to end in the direction of travel, each link having a pair of spaced-apart guide webs and a cog which connects the webs, the cogs being of substantially identical size. The drive sprocket wheel has at least two circumferential sections with teeth having spaces therebetween for engaging cogs. The tooth pitch in each section decreases in the direction of travel from a maximum valve to a minimum value, the space between teeth having the minimum value being sufficient to accommodate one of the cogs with clearance.

Abstract: A winch includes a cylindrical cable drum with cable grooves machined into the surface. A lifting cable can be wound in a plurality of layers onto the grooves. Two flanged disks limit the cable drum laterally and have a securing device for the end of the lifting cable in the first layer of winding. The end of the lifting cable may be pushed into a cable duct which is machined within one of the two flanged disks and emerges from an emergence region of the cable duct substantially on the radius of curvature of the first layer of winding from the inner side of the one of the flanged disks. The course of the emergence region approximately corresponds to the helical course of the lifting cable in the first layer thereof. The lifting cable is retainable by non-positive or positive fitting in the cable duct.

Abstract: A rotatably mounted ring having external teeth which mesh with a drive pinion of a fixedly mounted slewing gear, has distributed over the circumference, alternately portions of the same length with recesses and portions of the same length with radially directed webs and can be coupled to a complementary ring in the manner of a bayonet fastening. The complementary ring has, both on the inside and on the outside, portions of the same length with recesses and portions of the same length with radially directed webs. The ring provided with the external toothing is provided with complementary recesses and webs.

Abstract: A method for synchronously retracting and extending a jib of a crane having a plurality of telescoping lengths, preferably in a vehicle crane, extending and retracting being with driving means which is one of a hydraulically-driven, multistage telescoping cylinder and a plurality of single-stage telescoping cylinders operated in parallel.

Abstract: A drive sprocket for an endless chain on a track-type undercarriage includes a toothed wheel having a plurality of circumferential teeth extending from a root circle. A pair of mounting rings fixed to opposite axial sides of the wheel support a respective pair of rotating rings by means of bearings, each rotating ring forming a tread having a diameter which is small than the diameter of the root circle. The endless chain has a plurality of links connected end-to-end, each link having a pair of spaced apart guide webs extending in the direction of travel and connected by a cog which engages between two adjacent teeth on the toothed wheel, each guide web being profiled to ride on one of the treads.