| 摘要 |
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.
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