Communications: electrical – Selective – Having indication or alarm
Patent
1978-11-14
1981-07-14
Grody, James J.
Communications: electrical
Selective
Having indication or alarm
312237, 340 32, 340 52H, 367909, G08G 100, G08G 116
Patent
active
042789621
ABSTRACT:
An automatic alarm is disclosed for detecting obstacles behind a vehicle as the vehicle travels backwards. The alarm includes a casing mounted at the rear of the vehicle and having a rearwardly facing opening. A revolving disc is mounted within the casing which is driven by a motor in the casing. A printed circuit plate is fixed within the casing under the revolving disc. A supersonic transmitting member is installed on the revolving disc. A supersonic receiving member is installed on the revolving disc. The transmitting and receiving members are simultaneously alignable with the opening and are electrically connected to a printed circuit on the printed circuit plate at least when the transmitting and receiving members are aligned with the opening, so that the transmitting member emits a signal which is deflected off adjacent obstacles and is detected by the receiving member. An alarm member is connected in series with the circuit on the printed circuit plate so that deflected signals detected by the receiving member actuate the alarm member to alert a driver of the vehicle.
REFERENCES:
patent: 3681750 (1972-08-01), Larka
patent: 3892483 (1975-07-01), Saufferer
Grody James J.
Reino International Corporation
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