Drive assembly for pavement planing apparatus

A resonant system comprising a beam, means supporting the beam intermediate the ends of the beam, the ends being free to move laterally with arcuate bending of the beam, and oscillator means secured to the beam at one end for inducing resonant vibration of the beam to achieve work output at the other opposite end of the beam, the oscillator means including a housing formed in the beam as an integral part thereof, at least two pairs of equal size axially aligned bearings mounted in the housing, a shaft journaled in the bearings, two outer eccentric weights of equal size mounted on the shaft with the two pairs of bearings positioned between the two outer weights, at least one inner eccentric weight having an aggregate weight equal to the sum of the outer weights mounted on the shaft between two pairs of bearings, the eccentric positions of each said weight being fixed and equal, and means for rotating the shaft and eccentric weight, whereby the eccentric forces exerted on each of the bearings is substantially equal.