Swimming pool alarm

Details Swimming pool alarm Swimming pool alarm

1983-05-09

1985-08-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

310324, G08B 2100

Patent

active

045339074

ABSTRACT:
A swimming pool alarm in the form of an inexpensive compact unit which floats on the water in a swimming pool and which may be anchored to the side of the pool. The unit includes a hollow tubular probe which extends down below the surface of the water in the pool. The probe has an open bottom and a top closed by a flexible metal diaphragm. A piezoelectric ceramic member is attached to the upper surface of the diaphragm, and it serves to detect movements of the diaphragm in response to pressure changes in the air trapped in the upper portion of the probe. An electric circuit is connected to the piezoelectric ceramic member to activate and latch an electric alarm when the air pressure exceeds a predetermined threshold indicating, for example, that wave action in the pool has exceeded a predetermined level due to the fact that someone has fallen into the pool.

REFERENCES:
patent: 3461446 (1979-10-01), Sergeant
patent: 4189722 (1980-02-01), Lerner
patent: 4228379 (1980-10-01), Guscott et al.

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