Communications: electrical – Selective – Having indication or alarm
Patent
1978-08-03
1981-10-06
Groody, James J.
Communications: electrical
Selective
Having indication or alarm
40465, 40467, 40472, 116 63R, 340124, 3403785, 340810, 340663, 250548, G08G 109, G09F 1128, G09F 1116, G08B 2100
Patent
active
042938414
ABSTRACT:
The pedestrian traffic control system of this invention utilizes an endless belt to successively display visible painted WALK, DONT START, and DONT WALK signs in a window of a display unit. The control unit may be employed with an ordinary three-state power system of the type that now operates flashing neon signs, but has the advantage that electric power operates the signs only when a sign is being moved into display position. Three distinct WALK, DONT START, and DONT WALK signs are used thereby avoiding the ambiguity of present systems in which a flashing DONT WALK sign cautions the pedestrian not to start, but to continue on his way. The movement of the endless belt is controlled by detecting markers, such as perforations, on the endless belt, thus assuring proper registration of the signs in display position. Electrical energy that becomes stored while the sign is energized drives the sign to display the DONT WALK sign, if the power fails. The invention may be applied to other types of endless signs and with other types of control means that move synchronously with the endless sign.
REFERENCES:
patent: 2514049 (1950-07-01), Graham
patent: 2724100 (1955-11-01), Hastings
patent: 3564495 (1971-02-01), Gould
patent: 3703778 (1972-11-01), Pfleger
patent: 3753001 (1973-08-01), Hiroshima et al.
patent: 3822493 (1974-07-01), Maley
patent: 4021793 (1977-05-01), Hill et al.
Detector Systems, Inc.
Groody James J.
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