Vibrator

Details Vibrator Vibrator

1989-07-18

1991-02-05

Williams, Hezron E.

Measuring and testing

Vibration

Vibrator

G01M 500

Patent

active

049894552

ABSTRACT:
A vibrator has a hydraulic circuit connected with a hydraulic power unit. An electromagnetic valve disposed at the hydraulic circuit is regulated for the time for actuating a switch valve through a control signal. A plunger capable of bearing a load of an object to be tested at an upper end portion thereof has an oil chamber for pressurizing the plunger in such a manner as to be able to move upward and downward. An oil passage communicates with the oil chamber and with the electromagnetic valve. A vibration applying cylinder is capable of vibrating the plunger at a desired amplitude and frequency through hydraulic oil which is fed from the electromagnetic valve. A lift means lifts the vibration applying cylinder to a predetermined height. A controller capable of outputting, as a control signal, a setting signal for setting at least the amplitude and frequency of the plunger is provided. A control unit actuates the hydraulic power unit and the electromagnetic valve in accordance with the control signal.

REFERENCES:
patent: 2274619 (1942-02-01), Swan
patent: 3916677 (1975-11-01), Isley et al.
patent: 4768374 (1988-09-01), Fouchey

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