Patent ID: 6991091

Claim:
A bi-directional vibratory conveyor, comprising: a generally horizontal elongated conveying surface; a drive shaft affixed for rotation about a first axis generally transverse to the direction of elongation of said conveying surface, said drive shaft having a primary counterweight and a driven sheave; a motor shaft generally parallel to and spaced from said drive shaft and affixed for rotation about a second axis, said motor shaft having a secondary counterweight and a driver sheave; said primary counterweight and said secondary counterweight being about 90° out of phase with one another; a timing belt coupling said driver sheave and said driven sheave; a motor having a reversible output connected to said motor shaft for causing one direction of rotation, said primary counterweight to lead said secondary counterweight by about 90° and for the opposite direction of rotation, said primary counterweight to lag said secondary counterweight by about 90° whereby said rotation produces a horizontal and vertical energy component; said motor, said shafts and said timing belt comprise a drive supported on a base by a spring; spring slats coupling said base to said conveying surface, said slats sized such that a total spring rate sets a single mass natural running frequency of said conveying surface greater than a primary running frequency; and a resiliency member coupling said energy components to said conveying surface.