Communications: electrical – Selective – Having indication or alarm
Patent
1975-05-15
1976-07-20
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
40 96, 40110, 116 63R, 340 44, 340373, G08G 100
Patent
active
039709884
ABSTRACT:
A traffic signal device, capable of being suspended from an overhead support, includes red colored and green colored lamps secured to an endless conveyor mounted about a pair of spaced sprocket wheels so as to effect movement of the lamps from the top to the bottom sprocket in the facing direction. The lamps are spaced on the conveyor so as to be sequentially exposed through an opening of a casing within which the sprockets and conveyor are mounted. Lighted amber traffic lamps are fixedly disposed at the top and bottom of the opening, and the red and green lamps are switched on and remain lighted only while moving downwardly. Stop and Go signs are likewise switched on and remain lighted while the respective red and green lamps are lighted. The motorist may therefore readily observe the time remaining for a llight change from green to red and from red to green.
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patent: 3408623 (1968-10-01), Wagner
patent: 3533062 (1970-10-01), Coffman
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patent: D978130 (1910-12-01), Barron
Caldwell John W.
Groody James J.
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