Abstract: An improved head for use with a concrete vibrator for settling concrete/aggregate is provided. The head includes a hollow casing with an eccentric rotor having a curved segment along one side and supported for rotation by a bearing at a first or drive end. A second bearing is provided adjacent a second, distal end of the rotor. In one embodiment, the second bearing includes a bushing of disparate material, such as brass. A lubricant in the casing forms a thin, high pressure oil film between the bushing and the internal surface of the distal end cap, as well as between the curved segment of the rotor and the internal surface of the casing. Since the eccentricity of the rotor is extended, enhanced vibration is obtained. In this first embodiment, the bushing is brazed to the distal end of the rotor and the casing is steel. The bushing is arcuate and is positioned in close proximity to the internal surface of the distal end cap along the curved segment and at its axial edge.

Abstract: An improved head for use with a concrete vibrator for settling concrete/aggregate is provided. The head includes a hollow casing with an eccentric rotor having a curved segment along one side and supported for rotation by a bearing at a first or drive end. A second bearing is provided adjacent a second, distal end of the rotor. In one embodiment, the second bearing includes a bushing of disparate material, such as brass. A lubricant in the casing forms a thin, high pressure oil film between the bushing and the internal surface of the distal end cap, as well as between the curved segment of the rotor and the internal surface of the casing. Since the eccentricity of the rotor is extended, enhanced vibration is obtained. In this first embodiment, the bushing is brazed to the distal end of the rotor and the casing is steel. The bushing is arcuate and is positioned in close proximity to the internal surface of the distal end cap along the curved segment and at its axial edge.

Abstract: An improved head for use with a concrete vibrator for settling concrete/aggregate is provided. The head includes a hollow casing with an eccentric rotor having a curved segment along one side and supported for rotation by a bearing at a first or drive end. A second bearing is provided adjacent a second, distal end of the rotor. In one embodiment, the second bearing includes a bushing of disparate material, such as brass. A lubricant in the casing forms a thin, high pressure oil film between the bushing and the internal surface of the distal end cap, as well as between the curved segment of the rotor and the internal surface of the casing. Since the eccentricity of the rotor is extended, enhanced vibration is obtained. In this first embodiment, the bushing is brazed to the distal end of the rotor and the casing is steel. The bushing is arcuate and is positioned in close proximity to the internal surface of the distal end cap along the curved segment and at its axial edge.

Abstract: A portable, hand-held concrete vibrating system employs a pendulous vibrator driven by a high speed, two-cycle motor that operates up to speeds of between 5000 and 6000 RPM. An elongated, rod-like frame supporting the motor is connected at its remote end to a vibrator head adapted to be immersed in plastic concrete. A pivoted weight generally coaxially disposed within the head forcibly causes vibrations in response to internal impacts. A compensating system within the head torsionally couples the flexible drive cable to the pendulous weight and accommodates axial and rotational stresses caused by high speed rotation. The compensating system, preferably disposed between sets of self aligning bearings, comprises a rigid power input end coupled to a rigid power output end by a resilient, preferably buna rubber midsection.