Sewer drain alarm unit

Details Sewer drain alarm unit Sewer drain alarm unit

1976-12-10

1978-05-23

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

200 819M, 200 84C, 340244D, G08B 2100

Patent

active

040913651

ABSTRACT:
A sewer back-up alarm unit. It replaces the plug in an access opening. And, it has a solid wall with a short pivoted arm mounted on the inside of the wall. The arm is angled and pivots freely between two positions, as limited by the wall. There is a liquid level float that is hung from one end of the arm by a flexible chain. A counterweight is mounted on the other end of the arm to pivot it to the position opposite to the one which the weight of the float causes. There is a magnetic switch mounted on the outside of the solid wall, and a magnet on the arm actuates the switch when the float is raised by the level of liquid in the sewer. An alarm circuit may be connected to the switch, as desired.

REFERENCES:
patent: 161680 (1875-04-01), Guest
patent: 357056 (1887-02-01), Weil
patent: 2307304 (1943-01-01), Rudd
patent: 2985187 (1961-05-01), Hamilton
patent: 3757316 (1973-09-01), Fiorenzo

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