Abstract: An oscillator or vibration exciter for soil or road tampers or compacting devices. Unbalanced shafts are journalled parallel to each other in a common housing, and are driven in opposite directions by gears which mesh with each other and are installed on the unbalanced shafts. Each shaft supports a centrifugal weight rigidly coupled therewith. One gear is rigidly connected with its unbalanced shaft, while the other gear is rotatably arranged on its unbalanced shaft and is coupled therewith in such a way that it can be shifted in the direction of rotation by shift pins, which are anchored in a slide piece which can be axially shifted in this unbalanced shaft. The shift pins project outwardly through a longitudinal slot in the unbalanced shaft. This other rotatable gear, on both sides, has stop faces which extend nearly radially as well as axially, and point in the same rotational direction. A shift pin is provided on each side of this gear, one end of each shift pin projecting from the unbalanced shaft.

Abstract: An imbalance oscillation exciter having two imbalance weights arranged on each of two axially parallel or coaxial imbalance-weight carriers positively rotatably coupled with one another and rotating counter to each other or in the same direction. At least one of these imbalance-weight carriers comprises a shaft, whereby the imbalance-weight carriers are coupled with each other by a hub for continuous opposite rotation for the purpose of changing the phase position of the imbalance weights. A pin fixed on the shaft slidably engages in a hub groove. The pin is shiftable along a shaft slot extending at an incline to the hub groove by means of an adjustment member arranged coaxially in the shaft. The shaft has an axially parallel cylinder chamber open toward one of its end faces and in which the adjustment member is slidable with a piston extension sealed with respect thereto and facing the open side of the cylinder chamber.

Abstract: A crank gear with adjustable crank radius for motor driven beating working implements, especially tamping implements, jack hammers, hammer drills and the like, in which the crank pin for the connecting rod is eccentrically arranged with regard to the crank shaft axis and when being adjusted moves in a circular path which is substantially parallel to its plane of circulation and is eccentric with regard to the crank shaft axis. That end of the crank shaft which faces the connecting rod is a crank disc. The crank pin is eccentrically arranged on a clamping or coupling disc which with regard to the crank shaft axis eccentrically engages that end face of the crank disc which faces toward the crank pin. The clamping disc, when in disengaging position, is rotatable from the outside of the crank gear relative to the crank disc and is adapted in a selected operative position to be arrested relative to the crank disc, by means of a tension force pressing the clamping disc against the crank disc.

Abstract: An unbalance oscillation generator with constant direction of rotation, in which the resultant centrifugal force is variable due to unbalance on the unbalance shaft including two parts adjustable relative to each other and fixable relative to each other in at least two relative angularly spaced positions. The resultant of the two unbalance forces generated by the two parts varies in value in the individual fixable relative angle positions. A control pin displaceable by means of an adjusting rod extending through the unbalance shaft and projecting from the end face of the unbalance shaft either engages a circumferential groove facing the unbalance shaft but located in the axially non-displaceable part of the unbalance weight or engages a recess or cutout branching off from the circumferential groove. The control pin fits with slight play into the recess and is adapted to be arrested in either one of the respective pertaining axial positions.

Abstract: A device for sealing V-belts and pulleys in plate jarring devices, in which a V-belt drive interconnects the drive motor and the unbalance oscillation generator fixedly connected to the bottom plate. The drive motor is in the advancing direction of the device offset relative to the oscillation generator and is arranged on the applied load cushioned relative to the ground plate. The device furthermore includes a protective housing which surrounds the pulleys and the V-belt and is closed on all sides with the exception of the passages for passing the motor shaft and unbalance shaft therethrough. The protective housing is firmly connected to the motor or to the applied load including the motor. The motor shaft passes in a dustproof manner through the passage provided therefor in the protective housing while a seal arranged stationarily is interposed between the motor shaft and the protective housing.