Abstract: A hysteresis clutch including a first rotor with magnets that are polarized in opposite directions in pairs in a circumferential direction and between which pole pieces are provided for deflecting the magnetic flux in the radial direction and a second rotor of the hysteresis clutch has a series of second permanent magnets that extend in the circumferential direction and which are arranged on a circle that is concentric to the rotational axis A, the number of the first magnets and the number of the second magnet are configured such that a smooth torque curve is achieved which is free of a detent torque or at least has a low detent torque.

Abstract: A structural support that can be used as a truss girder bridge crane, or the like. The support includes one or more rows 13 of segments 15, that are arranged in side by side relation along the length of the support. Each row 13 has extending there through at least one tensioning element 14 which is anchored at opposite ends of the row and is pretensioned with respect to the row in order to hold the segments of the row together. A support preferably includes one row 13 of segments 15 in a lower chord 11 of the support and another row 13 of segments in an upper chord of the support. Vertical framework is mounted between the chords with ends secured adjacent the segments 15 by the tensioning element. The individual segments and the tensioning elements may be directed to a construction site at the location of use and assembled into rows and the appropriate structural construction.

Abstract: A hysteresis clutch including a first rotor with magnets that are polarized in opposite directions in pairs in a circumferential direction and between which pole pieces are provided for deflecting the magnetic flux in the radial direction and a second rotor of the hysteresis clutch has a series of second permanent magnets that extend in the circumferential direction and which are arranged on a circle that is concentric to the rotational axis A, the number of the first magnets and the number of the second magnet are configured such that a smooth torque curve is achieved which is free of a detent torque or at least has a low detent torque.

Abstract: A structural support that can be used as a truss girder bridge crane, or the like. The support includes one or more rows 13 of segments 15, that are arranged in side by side relation along the length of the support. Each row 13 has extending there through at least one tensioning element 14 which is anchored at opposite ends of the row and is pretensioned with respect to the row in order to hold the segments of the row together. A support preferably includes one row 13 of segments 15 in a lower chord 11 of the support and another row 13 of segments in an upper chord of the support. Vertical framework is mounted between the chords with ends secured adjacent the segments 15 by the tensioning element. The individual segments and the tensioning elements may be directed to a construction site at the location of use and assembled into rows and the appropriate structural construction.

Abstract: A lifting hoist (10) having a drive train (14) containing a slip clutch arrangement (23) with a hysteresis clutch (26). The drive train (14) transfers torque, friction-free, in both forward and backward directions of movement between the motor (15) and a gearing (16). The hysteresis clutch (23) forms an unbranched torque transmission path between the motor (15) and the gearing (16). The hysteresis clutch (26) acts as a vibration damper, allows controlled emergency load lowering, and acts as a secure torque limiter in emergency malfunctions when lowering a load. It further can be used as a load indicator by reducing the load-lifting speed before the nominal load is reached or in the event of an overload.

Abstract: A lifting hoist (10) having a powertrain (14) that includes a hysteresis clutch (23) for transmitting torque from a driving motor (15) to a transmission for moving a load pulling element (11). The hysteresis clutch (23) can be set to incur a slippage differing significantly from zero before a nominal load bearing capacity (FNom) of the hysteresis clutch is reached by the pulling element (11). Hence, when the lifting hoist operates within the range at or near the nominal load-bearing capacity (FNom), it is operable with continuous slip. The waste heat generated in the process is preferably transferred to the wall of the transmission housing via an oil bath, with the wall serving as a cooling surface. The lifting hoist can be built smaller and has improved operating properties.

Abstract: A lifting hoist (10) having a drive train (14) containing a slip clutch arrangement (23) with a hysteresis clutch (26). The drive train (14) transfers torque, friction-free, in both forward and backward directions of movement between the motor (15) and a gearing (16). The hysteresis clutch (23) forms an unbranched torque transmission path between the motor (15) and the gearing (16). The hysteresis clutch (26) acts as a vibration damper, allows controlled emergency load lowering, and acts as a secure torque limiter in emergency malfunctions when lowering a load. It further can be used as a load indicator by reducing the load-lifting speed before the nominal load is reached or in the event of an overload.

Abstract: A guide-roller arrangement for gantry cranes (1) has two rotatably mounted axial carriers (21) on which the guide rollers are seated. The guide rollers (11, 12) are mounted on journals which are arranged in the carrier plate (15) in a manner eccentric to the axis of rotation (41) of the axial carrier (21). The selected eccentric position of the journal can be fixed in a formfitting manner with the aid of toothing formations (29, 36) on the axial carrier and on the carrier plate.

Abstract: A hoisting device or crane can be operated with at least two different maximum loads. The maximum load that can be hoisted in each case is correlated with the hoisting speed in order to prevent the dynamically developed peak load from exceeding the predetermined allowed load limiting values of the components of the crane or the hoisting device.

Abstract: A hoisting device or crane can be operated with at least two different maximum loads. The maximum load that can be hoisted in each case is correlated with the hoisting speed in order to prevent the dynamically developed peak load from exceeding the predetermined allowed load limiting values of the components of the crane or the hoisting device.