Importance

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Abstract

In a vibrator intending to be at least partially submerged in concrete or semi-fluid or viscous material for vibration thereof, the vibrator having a housing open at one end and enclosing a rotating eccentric weight assembly, and a motor attached to the housing open end driving the rotating eccentric weight, a vibration speed sensor includes a magnetic pick-up disposed in a port in an end wall of the motor and adjacent an end of a gear/gear shaft of magnetic material in said motor, wherein the gear/gear shaft has a discontinuity adjacent the magnetic pick-up, whereby rotation of the gear/gear shaft is sensed by the magnetic pick-up. The motor includes hydraulic inlet and outlet ports in the motor end wall with the magnetic pickup port disposed adjacent thereto. An output cable is connected to the magnetic pick-up and extends in parallel with hydraulic hoses attached to the hydraulic inlet and outlet ports. The hydraulic hoses and output cable are surrounded and protected by a generally tubular shield attached to one of the a) housing and b) motor. Processing means is connected to the output cable for receiving signals generated by the magnetic pick-up and in response therefor producing a signal representative of vibration speed. Display means is provided and is responsive to the signal for providing a visual indication of vibration speed.

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First Claim