Drowning alarm

Details Drowning alarm Drowning alarm

G - Physics

08

B

G08B 21/08 (2006.01)

Patent

CA 2448042

A drowning alarm is described. It is a device which activates an alarm when a person drowns, in order to alert bystanders to the drowning, so that they can save the drowning person. The device consists of two kinds of units: a portable unit, which is worn by each swimmer, and a base station, located on the pool deck or on the beach. The portable unit produces an alarm signal when the swimmer activates a manual alarm push button on the portable unit, or when a sensor on the portable unit detects that the unit is submerged in water for longer than a certain number of seconds. The alarm signal produced by the portable unit is ultrasound or audible sound, and it propagates in water to the base station. The base station activates an alarm such as a siren. The portable unit has a light emitting diode (LED), which is switched on when the portable unit activates an alarm. This identifies the portable unit which caused the alarm, so it helps deter intentional false alarms.

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