Vibrator
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United States of America Patent
Stats
-
Feb 5, 1991
Grant Date -
N/A
app pub date -
Jul 18, 1989
filing date -
Jul 23, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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