Patent ID: 6585450
Filing Date: 2003-07-01
Classification: B06B,E01C

Abstract:
An eccentric assembly for a vibration compacting machine, the eccentric assembly comprising:a tubular section, the tubular section being independently rotatable about an axis; an eccentric weight coupled within the tubular section and having a center of gravity on a first side of the axis and a cavity beginning on the first side of the axis and opening toward a second, opposite side of the axis, the eccentric weight includes a convex surface having a given curvature and the tubular section includes a concave surface having a given curvature, the curvature of the convex surface being substantially equal to the curvature of the concave surface; and a counterweight, having first and second portions, coupled with the eccentric weight, the counterweight having a total center of gravity and each portion having a portion center of gravity, the counterweight moveable relative to the eccentric weight over a range between a first position and a second position, the portions configured such that in the first position, the first portion extends into the cavity such that the first portion center of gravity is on the first side of the axis and the second portion center of gravity and the counterweight total center of gravity are on the second side of the axis; whereby the eccentric assembly provides a variable range of eccentric amplitude as the counterweight moves over the range between the first and second positions.