Protective device for dust collecting devices
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United States of America Patent
Stats
-
Apr 8, 1986
Grant Date -
N/A
app pub date -
Oct 1, 1984
filing date -
Feb 8, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Protective device for dust collecting devices, in particular vacuum cleaners such as wheel-mounted or hand vacuum cleaners, whereby the presence of any dust behind the dust collecting vessel, due to a damage to the dust collecting vessel, is detected by means of an electric sensor comprising a light receiver and a light transmitter, and supplied in the form of an electric signal to an associated evaluation circuit. The design of the evaluation circuit is such that when a given threshold value is exceeded it will respond and activate an associated blocking and braking arrangement for interrupting the operation of the vacuum cleaner abruptly. This prevents the collected dust, the quantities of which may be quite considerable, to be blown back within a few seconds into the environment by the continued operation of the dust collecting device in case the dust bag should for example break.
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