Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1985-05-08
1987-08-25
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340573, 343718, 441 69, 455100, G08B 108
Patent
active
046896112
ABSTRACT:
An alarm and communication system for water skiers as provided for use with a boat having a driver and a ski rope secured at one end to the back of the boat and a handle at the other end of the rope to which the skier holds, the system including a battery powered radio receiver positioned on the boat, the receiver having an antenna and being arranged to receive a pre-selected radio signal frequency, an alarm switch connected to the radio receiver to provide a closed contact in the absence of the reception by the receiver of a signal of pre-selected frequency and wattage, an alarm connected to the switch, and a radio transmitter, antenna and power source of a size to be supported above the water as a skier holds to a ski rope handle and is supported on the water surface when pulled by the boat, the transmitter antenna being arranged to transmit at the pre-selected frequency of the receiver and of selected wattage sufficient that when the skier is ahold of the ski rope handle and supported above the water surface the alarm switch is kept in the open position but which transmitter and antenna transmit insufficient wattage to keep the alarm switch open when the skier does not have hold of the ski rope handle and is not being supported above the surface of the water whereby the driver of the boat is provided a signal when the skier releases hold on the ski rope handle.
REFERENCES:
patent: 3018474 (1962-01-01), Cluck et al.
patent: 3798631 (1974-03-01), Langford
patent: 3902118 (1975-08-01), Ikrath et al.
patent: 4483683 (1984-11-01), Alley, Sr.
patent: 4549169 (1985-10-01), Moura et al.
Mullen Jr. Thomas J.
Swann III Glen R.
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