The vibration device according to the invention includes a compensating device influenced by compensating masses for exciting forces caused by the vibrationary movement, the compensating masses respectively being arranged as partial masses on a hollow shaft, being coaxial with respect to one another, and including a displacing rod in their center by means of which the partial masses of the compensating weights can be displaced in the same manner as the eccentric determining the vibrational movement.
A pump for conveying a liquid has a housing and a shaft rotatably supported in the housing. An eccentric drive is arranged in the housing. At least one drive element is provided and is configured to be driven by the eccentric drive. The shaft is configured to adjust the eccentricity of the eccentric drive. The drive element is configured to be adjusted according to the eccentricity of the eccentric drive by a translatory movement in a direction transverse to the shaft.
A vibratory apparatus, useful with a vibrated plow, cable layer or the like, includes a housing and a shaft mounted to the housing for rotation about a shaft axis. Counterrevolving first and second eccentric weights are supported by the shaft for rotation about such axis. A drive gear is fixed with respect to the shaft and another drive gear is fixed with respect to the second weight. A transition gear engages both drive gears for counter-rotation of the weights about the same axis of rotation. Most preferably, the weights are configured to "interdigitate" as the shaft and weights rotate. That is, as the weights rotate in opposite directions, the first weight passes through a cavity in the second weight. The drive gears and the transition gear are preferably bevel gears and form what might be termed a differential gear set.
