Protective circuit for an electrically driven liquid vacuum cleaner
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United States of America Patent
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-
Mar 27, 1990
Grant Date -
N/A
app pub date -
Jan 30, 1989
filing date -
Feb 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In connection with a protective circuit for an electrically driven liquid or water vacuum cleaner it is proposed to utilize the abrupt rise of the vacuum, which is encountered when a blocking element interrupts the connection between the receptacle for the liquid and the motor/blower area. The vacuum rise is detected by a diaphragm-type vacuum governor and used for triggering a lockable flip-flop which then interrupts the current supply of the drive motor. The locked condition can be released only by disconnecting the unit from the mains.
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