Pool alarm
First Claim
1. A wave motion detector for a swimming pool comprising:
- transducer means responsive to pressure changes in swimming pool water caused by the entry of a body into the pool and operative to generate corresponding electrical signals;
comparator means responsive to said electrical signals and operative to provide a detection signal each time said electrical signal exceeds a predetermined threshold level; and
discriminator means responsive to said detection signals and operative to generate an alarm signal each time a first detection signal is followed by a second detection signal occurring after a predetermined first portion and during a predetermined second portion of a predetermined time period following said first detection signal, said predetermined time period being approximately one second in duration and said second portion being equal to or less than one half of said time period.
1 Assignment
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Accused Products
Abstract
A swimming pool alarm responsive to wave motion that will produce a signal when two waves exceeding a threshold level of amplitude are sensed within a preset duration of time. A transducer senses air or water pressure changes and produces electrical signals corresponding to the changes. A comparator system, connected to the transducer, receives the transducer signals and, if the signals exceed a preset threshold level, transmits a signal to the discriminator system. The discriminator times the signals received from the comparator and when two signals are received within a specified period of time, a third signal is generated. A warning device such as an alarm is connected to the discriminator and will be activated by the third signal.
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Citations
11 Claims
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1. A wave motion detector for a swimming pool comprising:
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transducer means responsive to pressure changes in swimming pool water caused by the entry of a body into the pool and operative to generate corresponding electrical signals; comparator means responsive to said electrical signals and operative to provide a detection signal each time said electrical signal exceeds a predetermined threshold level; and discriminator means responsive to said detection signals and operative to generate an alarm signal each time a first detection signal is followed by a second detection signal occurring after a predetermined first portion and during a predetermined second portion of a predetermined time period following said first detection signal, said predetermined time period being approximately one second in duration and said second portion being equal to or less than one half of said time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification