Buoys – rafts – and aquatic devices – Buoy – Marker buoy
Patent
1997-02-05
1998-08-11
Avila, Stephen
Buoys, rafts, and aquatic devices
Buoy
Marker buoy
441 89, 441 92, B63C 908
Patent
active
057919569
ABSTRACT:
A safety device to be worn by a diver includes means for monitoring the breathing of the diver and causing release and inflation of a surface marker buoy attached thereto by a line if it detects he has stopped breathing. The monitoring means may also be operable to cause release of a cover of the device allowing the surface marker buoy to rise or the cover may be a simple friction fit pushed aside by the inflating marker buoy. The monitoring means includes a transducer monitoring the pressure of gas breathed, or the flow of gas inhaled or exhaled, by a diver. Various forms of electrical and electro-mechanical logic circuits are described, each of which provides for the comparison over pre-set or pre-settable time intervals of measurements made of gas pressure or flow rate values with pre-set values or with earlier recorded values. The device may be incorporated in the divers breathing equipment or be separate from the equipment but linked to the equipment by a flexible connection. The line has a breaking strain enabling a diver to be pulled to the surface by any associate or assistant on the surface. A radio beacon may be activated and a marker dye released when the buoy is deployed. Switches are provided disabling operation of the device at less than a predetermined depth and allowing the diver to prevent and/or trigger operation of the device.
REFERENCES:
patent: 3798629 (1974-03-01), De La Taillade et al.
patent: 3871044 (1975-03-01), Wedrall
patent: 4080677 (1978-03-01), Koehler
patent: 4186374 (1980-01-01), Oullette
patent: 5022790 (1991-06-01), Stevenson
patent: 5029293 (1991-07-01), Fontanille
patent: 5326297 (1994-07-01), Loughlin
patent: 5328298 (1994-07-01), Maffatone
patent: 5403219 (1995-04-01), Ryan
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