Abstract: A drive device includes a speed modulation gearbox having a planetary gear mechanism and a casing, a main drive machine which is connected to an input shaft of the speed modulation gearbox, two auxiliary drives, each connected to the planetary gear mechanism via a drive connection. An output shaft of the speed modulation gearbox can be connected to a working machine. The planetary gear mechanism includes a ring gear, a sun gear, a planet carrier and several planet gears. For each auxiliary drive, an additional drive connection with a constant transmission ratio exists between the auxiliary drives and the input shaft or between the auxiliary drives and a driven shaft of the planetary gear mechanism. The additional drive connections can each be engaged or disengaged by a respective switching clutch, wherein the drive connections from the auxiliary drives to the speed modulation gearbox remain engaged in any case.

Abstract: A drive device includes a speed modulation gearbox having a planetary gear mechanism and a casing, a main drive machine which is connected to an input shaft of the speed modulation gearbox, two auxiliary drives, each connected to the planetary gear mechanism via a drive connection. An output shaft of the speed modulation gearbox can be connected to a working machine. The planetary gear mechanism includes a ring gear, a sun gear, a planet carrier and several planet gears. For each auxiliary drive, an additional drive connection with a constant transmission ratio exists between the auxiliary drives and the input shaft or between the auxiliary drives and a driven shaft of the planetary gear mechanism. The additional drive connections can each be engaged or disengaged by a respective switching clutch, wherein the drive connections from the auxiliary drives to the speed modulation gearbox remain engaged in any case.

Abstract: An electrical switching device comprises a contact point having two double-break contacts, a contact link having a width, a contact pressure spring exerting a pressure on the contact link, a striker pin configured to act on the contact link counter to the pressure of the contact pressure spring during a switch-off operation so as to move the contact link into an open position, and a thruster actuatable by a switching mechanism and configured to guide the striker pin, the thruster having two limbs projecting in the same direction towards a free end of the thruster so as to form a slot there between, wherein a distance between the two limbs tapers towards the free end such that the distance at the free end is smaller than the width of the contact link, so that the contact link is clamped between the two limbs during the switch-off operation.

Abstract: An electrical switching device comprises a contact point having two double-break contacts, a contact link having a width, a contact pressure spring exerting a pressure on the contact link, a striker pin configured to act on the contact link counter to the pressure of the contact pressure spring during a switch-off operation so as to move the contact link into an open position, and a thruster actuatable by a switching mechanism and configured to guide the striker pin, the thruster having two limbs projecting in the same direction towards a free end of the thruster so as to form a slot there between, wherein a distance between the two limbs tapers towards the free end such that the distance at the free end is smaller than the width of the contact link, so that the contact link is clamped between the two limbs during the switch-off operation.