Amplitude changing apparatus
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United States of America Patent
Stats
-
Feb 24, 1987
Grant Date -
N/A
app pub date -
Nov 13, 1984
filing date -
Nov 11, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is directed to an apparatus for resetting the vibration amplitude of a hydraulically driven vibration device having two eccentric weights arranged on a rotating shaft and rotatable relative to each other. The amplitude-resetting arrangement includes a hydraulic directional valve for resetting the vibration device between high and low amplitudes. The valve is electrically operated and the electric control circuit incorporates a time-delay relay for delaying the amplitude change until the speed of the rotating shaft has been reduced to an acceptable level.
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