Sewage back-up alarm

Details Sewage back-up alarm Sewage back-up alarm

1980-10-09

1983-07-05

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

137557, 137558, 340620, G08B 2100

Patent

active

043921280

ABSTRACT:
A sewer back-up alarm apparatus for placement in an existing sewer line connecting a residence to a sewage collection system, the alarm apparatus including a connection element connected into a sewer line, an adaptor attached to the connection element, a cap attached in air-tight and water-proof relationship to the adaptor, the adaptor also having an O-ring for sealing the cap to the adaptor, whereby backed up sewage in the sewer pipe forcibly ejects the cap from the adaptor and permits the backed up sewage to flow onto the ground, rather than into the residence; the back-up alarm system also includes first and second electrical conductors extending into the interior of the connection element for electrically contacting backed up sewage to produce reduced electrical resistance between the first and second conductors. An alarm circuit generates an alarm signal in response to a reduced resistance to actuate an audible buzzer.

REFERENCES:
patent: 3311722 (1967-03-01), Hammerschmidt et al.
patent: 3399399 (1968-08-01), Apfelbaum
patent: 3757316 (1973-09-01), Fiorenzo
patent: 3844310 (1974-10-01), Brindisi
patent: 4015624 (1977-04-01), Wanstreet et al.
patent: 4261386 (1981-04-01), Young

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