Fail-safe stop light apparatus

Details Fail-safe stop light apparatus Fail-safe stop light apparatus

1994-11-22

1996-04-02

Peng, John K.

Communications: electrical

Traffic control indicator

Traffic control or local controller failure indicator

340930, 3408158, 340815, 3408159, 3409321, 40612, G08G 1097

Patent

active

055044816

ABSTRACT:
An apparatus for covering a face of a traffic light with a warning sign as a result of a power failure to the traffic light. A first member is rotatably mounted to one side of the traffic light and a second member is rotatably mounted to the other side of the traffic light. A first electromagnet and a second electromagnet are provided for securing the first and second members in a first position away from the face of the traffic light. A first coil spring and a second coil spring are mounted respectively to the members and to the sides of the traffic light and cause the members to rotate to a second position covering the face of the traffic light upon release of the members by the electromagnets. An electric motor is also provided and is connected to a pair of linkage mechanisms to rewind the first and second members to their first position upon resumption of electrical power to the traffic light.

REFERENCES:
patent: 1326009 (1919-12-01), Wetter
patent: 1407444 (1920-02-01), Smith et al.
patent: 2525937 (1950-10-01), Palm
patent: 3863214 (1975-01-01), Kerr, Jr.
patent: 4502711 (1985-03-01), Muth
patent: 4642605 (1987-02-01), Karp

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