Communications: electrical – Watercraft alarm or indicating systems
Patent
1991-11-12
1992-11-10
Ng, Jin F.
Communications: electrical
Watercraft alarm or indicating systems
114197, 116 26, 340568, 340686, G08B 2300
Patent
active
051627930
ABSTRACT:
Apparatus for indicating the absence of a drain plug in a boat drain when the boat is in a launch condition includes an electrically activated alarm connected in series with an electrical power source and a control circuit for connecting and disconnecting the alarm to the power source. The control circuit is contained in a housing mounted proximate the boat drain on an exterior portion of the boat and includes a normally open switch closable by immersion of contacts in water and operable in response to an actuator mounted on the drain plug so that, when the drain plug is properly seated in the boat drain, the switch will be in an open condition. Thus, if the drain plug is not properly seated in the drain when the boat is launched into the water, the control circuit will be completed by immersion of the contacts in the water and the alarm will be activated. However, if the drain plug is properly seated, the switch will be in an open condition and the alarm will not be activated, even when the boat is in a launch condition. The housing can be mounted proximate the drain in a position such that the contacts are immersed at a level at or below the level of the drain so that the alarm will be activated prior to the entry of water into the drain.
REFERENCES:
patent: 3821699 (1974-06-01), Marus et al.
patent: 3896280 (1975-07-01), Blake
patent: 4516515 (1985-05-01), Johnson
patent: 4542373 (1985-09-01), Hillock
patent: 4843376 (1989-06-01), Wagner et al.
patent: 4930657 (1990-06-01), Walker
patent: 5047753 (1991-09-01), Birchfield
Hodgson Henry A.
Plost Gerald N.
Ng Jin F.
Swarthout Brent A.
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