| 摘要 |
<p>Call, alarm or like device for scuba divers during immersions, made up by a substantially cylindrical hollow container (1), sealed at the opposite ends by two stoppers (2, 3) or the like, within which an ultrasound electromagnetic electronic receiving and transmitting circuit (5) is provided, with the relevant sensors for the reception (4) and transmission (5) of electro-acoustic signals, in communication with the outside of the container, as well as for the transformation of the received signals into audio-visible or vibration based warnings, said electronic circuit being fed by a cell or accumulator of a known type, enclosed within said container in such a way as to keep constantly fed the signal reception circuit on immersing and to allow the activation of the transmission circuit through a switch activated by pulling a rope or a fall ending with a knob or the like for hand-activation.</p> |
