Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-10-31
1980-05-13
Robinson, Thomas A.
Communications: electrical
Condition responsive indicating system
Specific condition
340620, G08B 2100
Patent
active
042030978
ABSTRACT:
A device for indicating a disturbance in a liquid medium, which is especially useful for providing an alarm when a child falls into a swimming pool, comprises a buoyant member carrying a first conductive member, a second conductive member spaced and normally unconnected to the first conductive member, and an alarm circuit. The conductive members are connected to the alarm circuit such that when the liquid in which the buoyant member is floating is disturbed by a predetermined amount, the conductive members are brought into contact through the disturbed liquid, thereby to activate the alarm.
REFERENCES:
patent: 3636544 (1972-01-01), Codina
patent: 3732556 (1973-05-01), Caprillo et al.
patent: 4017842 (1977-04-01), Vineyard
RMR Systems Inc.
Robinson Thomas A.
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