Abstract: The eccentric assembly includes a shaft, first and second eccentric weights, and a member. The first and second eccentric weights are rotatably coupled to the shaft such that they generate vibrations which are transferred to the drum assembly of the vibration compacting machine when the shaft is rotated by a motor. The eccentric weights are also coupled to the shaft by the member which moves the eccentric weights between a first position where the eccentric weights are in phase and a second position where the eccentric weights are out-of-phase. When the eccentric weights are in phase the eccentric assembly generates a maximum moment of eccentricity about the shaft. As the rotational speed of the shaft increases to generate higher frequency vibrations, the eccentric weights move more out of phase reducing the moment of eccentricity generated by the rotating shaft.

Abstract: The eccentric assembly includes a shaft, first and second eccentric weights, and a member. The first and second eccentric weights are rotatably coupled to the shaft such that they generate vibrations which are transferred to the drum assembly of the vibration compacting machine when the shaft is rotated by a motor. The eccentric weights are also coupled to the shaft by the member which moves the eccentric weights between a first position where the eccentric weights are in phase and a second position where the eccentric weights are out-of-phase. When the eccentric weights are in phase the eccentric assembly generates a maximum moment of eccentricity about the shaft. As the rotational speed of the shaft increases to generate higher frequency vibrations, the eccentric weights move more out of phase reducing the moment of eccentricity generated by the rotating shaft.

Abstract: The eccentric assembly includes a shaft, an eccentric weight, and a counterweight. The eccentric weight is mounted on the shaft such that as a motor rotates the shaft, the eccentric weight generates vibrations that are transferred to the drum assembly of the vibration compacting machine. The eccentric assembly also includes a counterweight that is coupled to the eccentric weight. The counterweight moves between a first position where a first surface on the counterweight contacts a second surface on the eccentric weight and a second position where the first surface of the counterweight is separated from the second surface of the eccentric weight. One of the entire first or second surfaces engages the other of the first surface or second surface when the eccentric weight and the counterweight are in the first position.