Abstract: A lift crane includes a carbody and movable ground engaging members mounted on the carbody. A rotating bed is rotatably connected to the carbody and includes a counterweight support frame including a rack coupled directly to a lower surface of the rotating bed. A boom is pivotally mounted to the rotating bed. A counterweight unit movement device is configured to move the counterweight unit toward and away from the boom. At least one auxiliary member includes a counterweight pad that is configured to not touch the ground during a pick, move, and set operation. A linear actuator is configured to adjust a distance that the counterweight pad is above the ground.

Abstract: A level-controllable crawler crane includes two crawler supports with rotating crawlers, which crawler supports are connected by a transversal bridge. A superstructure of the crawler crane includes a crane jib pivotable about a vertical axis and connected to the transversal bridge. A pivotable articulation connects the transversal bridge to the crane superstructure. At least one of the crawler supports is connected to the transversal bridge by a double link having a lower and an upper link. The lower link is articulated on the crawler support by a crawler support lower pivotable axis and on the transversal bridge by a transversal bridge lower pivotable axis. The upper link is articulated on the crawler support by a crawler support upper pivotable axis and on the transversal bridge by a transversal bridge upper pivotable axis. A drive pivots the links about the pivotable axis associated therewith.

Abstract: A lift crane includes a carbody and movable ground engaging members mounted on the carbody. A rotating bed is rotatably connected to the carbody and includes a counterweight support frame including a rack coupled directly to a lower surface of the rotating bed. A boom is pivotally mounted to the rotating bed. A counterweight unit movement device is configured to move the counterweight unit toward and away from the boom. At least one auxiliary member includes a counterweight pad that is configured to not touch the ground during a pick, move, and set operation. A linear actuator is configured to adjust a distance that the counterweight pad is above the ground.

Abstract: A level-controllable crawler crane includes two crawler supports with rotating crawlers, which crawler supports are connected by a transversal bridge. A superstructure of the crawler crane includes a crane jib pivotable about a vertical axis and connected to the transversal bridge. A pivotable articulation connects the transversal bridge to the crane superstructure. At least one of the crawler supports is connected to the transversal bridge by a double link having a lower and an upper link. The lower link is articulated on the crawler support by a crawler support lower pivotable axis and on the transversal bridge by a transversal bridge lower pivotable axis. The upper link is articulated on the crawler support by a crawler support upper pivotable axis and on the transversal bridge by a transversal bridge upper pivotable axis. A drive pivots the links about the pivotable axis associated therewith.

Abstract: The invention relates to a crawler crane comprising two crawler supports (9) with rotating crawlers (8). Both crawler supports (9) are connected by a transversal bridge (10). A superstructure (3) of the crawler crane comprises at least one crane jib that can pivot about a vertical axis and is connected to the transversal bridge (10). A pivotable articulation connects the transversal bridge (19) in a pivotable manner to the crane superstructure (3). At least one of the crawler supports (9) is connected to the transversal bridge (10) by means of a double link (11). A lower link (12) of the double link (11) is articulated on the crawler support (9) by means of a crawler support lower pivotable axis (13) and on the transversal bridge (10) by means of a transversal bridge lower pivotable axis (14).

Abstract: The invention relates to a tracked running gear, in which two running gears are arranged parallel to one another and each running gear has a longitudinal member (1) and a running gear chain (2) which runs around the longitudinal member in the longitudinal direction thereof and forms an upper and a lower strand, and at least one traction drive, composed of a motor, transmission and a drive gearwheel which meshes into the running gear chain and also a deflecting wheel which permits chain tensioning by means of a movement relative to the fixed part of the longitudinal member, characterized in that at least one additional traction drive (3) which acts on the upper strand is provided on the longitudinal member, wherein the running gear length is changed or remains unchanged.

Abstract: The invention relates to a crawler crane comprising two crawler supports (9) with rotating crawlers (8). Both crawler supports (9) are connected by a transversal bridge (10). A superstructure (3) of the crawler crane comprises at least one crane jib that can pivot about a vertical axis and is connected to the transversal bridge (10). A pivotable articulation connects the transversal bridge (19) in a pivotable manner to the crane superstructure (3). At least one of the crawler supports (9) is connected to the transversal bridge (10) by means of a double link (11). A lower link (12) of the double link (11) is articulated on the crawler support (9) by means of a crawler support lower pivotable axis (13) and on the transversal bridge (10) by means of a transversal bridge lower pivotable axis (14).

Abstract: The invention concerns a lattice boom crane, which is composed of at least two individual lattice boom cranes (1, 11), which each comprise a luffing lattice boom (4, 14), whose luffing angle is adjustable by a luffing mechanism (5, 15). The lattice booms (4, 14) of the individual lattice boom cranes (1, 11) are connected with each other and oriented in parallel and adjacent to each other and the luffing mechanisms (5, 15) of the lattice boom cranes (1, 11) are synchronously operated, such that the rigidly-connected lattice booms (4, 14) are synchronously luffable.

Abstract: The present invention relates to a rope winding system (1) for winding and unwinding a steel rope (4) of a crane (7). A rope winding system (1) according to the present invention has a rope drum (6), onto which the steel rope (4) can be wound in a plurality of layers, and a magnetic system (7) which is configured to generate a magnetic field over a section of the steel rope (4) with its magnetic flux being deflected by a movement of the steel rope (4) in such a way that the steel rope (4) is braked. A crane (7) is also discloses which is equipped with such a rope winding system (1) for winding and unwinding a steel rope (4).

Abstract: The invention refers to a truck roller assembly (12) for a crawler chain comprising at least two spaced track roller portions (5, 5?) with running surfaces for running on the crawler chain (13), and a star-shaped element (6) for guiding the track roller assembly (12) on the crawler chain (13). The star-shaped element (6) is mounted freely rotatably between the at least two track roller portions (5, 5?), and it is provided with a plurality of teeth (6?, 6?, 6??, 6??, 6???). The teeth (6?, 6?, 6??, 6??, 6???) co-operate with the crawler chain (13) in such a way that on rolling over chain links (3) of the crawler chain (13) they engage into corresponding gaps (8) in the crawler chain (13).

Abstract: The invention proposes a hoisting-cable drive for a mobile crane, which hoisting-cable drive uses a single bottom-hook block (15) instead of a known double bottom-hook block. However, to prevent this single bottom-hook block (15) from tilting in the two cable lines (9, 10), for example due to possible variations in the elongation of the two cable drives, the hoisting-cable drive according to the invention comprises a kinematic force equilibrium device (17, 21), which can equalize such differences. To this effect, another embodiment of the hoisting-cable drive according to the invention uses a hoisting-cable load pickup (21) within each cable line arrangement so that the rotary speed of the winches (7, 8) can be varied, taking into account any load differences in the individual hoisting-cable lines (9, 10). Furthermore, the invention also proposes that the rotary speed of the winches (7, 8) be adjusted, taking into account the geometric winch states and crane states.

Abstract: The invention refers to a truck roller assembly (12) for a crawler chain comprising at least two spaced track roller portions (5, 5?) with running surfaces for running on the crawler chain (13), and a star-shaped element (6) for guiding the track roller assembly (12) on the crawler chain (13). The star-shaped element (6) is mounted freely rotatably between the at least two track roller portions (5, 5?), and it is provided with a plurality of teeth (6?, 6?, 6??, 6??, 6???). The teeth (6?, 6?, 6??, 6??, 6???) co-operate with the crawler chain (13) in such a way that on rolling over chain links (3) of the crawler chain (13) they engage into corresponding gaps (8) in the crawler chain (13).

Abstract: The invention proposes a hoisting-cable drive for a mobile crane, which hoisting-cable drive uses a single bottom-hook block (15) instead of a known double bottom-hook block. However, to prevent this single bottom-hook block (15) from tilting in the two cable lines (9, 10), for example due to possible variations in the elongation of the two cable drives, the hoisting-cable drive according to the invention comprises a kinematic force equilibrium device (17, 21), which can equalize such differences. To this effect, another embodiment of the hoisting-cable drive according to the invention uses a hoisting-cable load pickup (21) within each cable line arrangement so that the rotary speed of the winches (7, 8) can be varied, taking into account any load differences in the individual hoisting-cable lines (9, 10). Furthermore, the invention also proposes that the rotary speed of the winches (7, 8) be adjusted, taking into account the geometric winch states and crane states.

Abstract: The present invention relates to a rope winding system (1) for winding and unwinding a steel rope (4) of a crane (7). A rope winding system (1) according to the present invention has a rope drum (6), onto which the steel rope (4) can be wound in a plurality of layers, and a magnetic system (7) which is configured to generate a magnetic field over a section of the steel rope (4) with its magnetic flux being deflected by a movement of the steel rope (4) in such a way that the steel rope (4) is braked. A crane (7) is also discloses which is equipped with such a rope winding system (1) for winding and unwinding a steel rope (4).

Abstract: The invention concerns a crane undercarriage (1) that comprises a center section (2), which is constructed for removable mounting of a rotatable crane superstructure (40), and a plurality of outriggers (4), which are pivotably supported on the center section (2) for assuming a transport configuration and at least one operational configuration. The support elements (10; 20) necessary for the operation of the crane are attachable on the outriggers (4). In addition, the invention concerns a variable crane that comprises a crane undercarriage of the above-mentioned type and selectively a set of crawlers (10) or a set of floor jacks (20) is removably mountable on the crane undercarriage (1).

Abstract: The invention concerns a lattice boom crane, which is composed of at least two individual lattice boom cranes (1, 11), which each comprise a luffing lattice boom (4, 14), whose luffing angle is adjustable by a luffing mechanism (5, 15). The lattice booms (4, 14) of the individual lattice boom cranes (1, 11) are connected with each other and oriented in parallel and adjacent to each other and the luffing mechanisms (5, 15) of the lattice boom cranes (1, 11) are synchronously operated, such that the rigidly-connected lattice booms (4, 14) are synchronously luffable.

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 guide for a multi-link endless chain of a track-type undercarriage, especially for cranes, has an undercarriage support, at least one drive sprocket wheel provided with chain teeth, possibly an idler, and several track rollers. Each chain link of the endless chain has two guide webs which are symmetric to the center, spaced a certain distance apart, and extend in the travel direction. The webs have engaging surfaces which ride on opposed circumferential flanges on the drive sprocket wheel. A cog connects the two webs below the engaging surfaces and meshes with the chain teeth of the drive sprocket wheel. The guide has two parallel rails oriented in the travel direction of the endless chain, the inside surfaces of the rails coming to rest against the outside surfaces of the associated guide webs when the guide function is occurring.

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.