Patent ID: 6394639
Filing Date: 2002-05-28
Classification: B01F,B28B,E04G

Abstract:
A head for a concrete vibrator comprising:a hollow cylindrical casing; an eccentric rotor disposed in said casing; a bearing for mounting said rotor for rotation in said casing adjacent a first end; a lubricant in said casing; a gap forming a thin high pressure film of said lubricant between at least said rotor and the internal surface of said casing sufficient to provide a lifting force for said rotor away from said internal surface and providing a counterbalancing force for said bearing; said rotor is arcuate and extends in close proximity to said internal surface to form said gap with the thin film of lubricant between said rotor and said surface; said rotor includes a leading beveled edge to assist in capturing said lubricant and forming said thin film as the rotor rotates, whereby the eccentricity of said rotor is maintained, while providing smooth rotation and enhanced vibration of the rotor.