Measuring and testing – Vibration – Sensing apparatus
Patent
1998-09-21
1999-11-30
Chapman, John E.
Measuring and testing
Vibration
Sensing apparatus
324174, 366123, G01H 1102, E01C 1938
Patent
active
059922389
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.
REFERENCES:
patent: 3814532 (1974-06-01), Barrett et al.
patent: 4057222 (1977-11-01), Lyle
patent: 5564824 (1996-10-01), Chaplin et al.
patent: 5618133 (1997-04-01), Mitsui et al.
patent: 5719338 (1998-02-01), Magalski et al.
"Hall Effect Speed Sensing in Gerotor Hydraulic Motors" by James M. Dowling (pp. 61-69). (undated).
Display entitled "Vibrator Speed Control" displayed by Minnich Mfg. at ConExpo-Con/Agg Trade Show, Las Vegas, NV, Mar. 20-24, 1996.
Handout entitled "Check Out This Demonstration . . . of the Smart Hydraulic Paving Vibrator" provided by Wyco Tool Co. at ConExpo-Con/Agg Trade Show, Mar. 1996.
Handout entitled "Minnich Introduces . . . Auto Vib" provided by Minnich Mfg. at ConExpo-Con/Agg Trade Show Mar. 1996.
Handout entitled "Auto Vibe II--The 2nd Generation" provided by Minnich Mfg. at World of Concrete Show, Orlando, FL, Jan. 18-21, 1998.
Chaplin James
Heimbruch Glenn A.
Chapman John E.
Racine Federated Inc.
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