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US 4,108,405 AGranted
Light assembly and flasher circuit
OwnerPreston H. Gibsoninventor
Life of this patent
Estimating the term…
Abstract
Generally speaking the present invention contemplates a kit-type railroad crossing signal device having four red, double lens lights attached to prewired arms, a module for flasher control, a battery box, an automatic controlled battery charger, switching control and, a metal conduit and clamps. A standard railroad signal bell can also be supplied.
Claims3
A railroad crossing signal device comprising:
- a. a T-shaped structure (15) with arm ends and lamp housing means at said ends, a center pole with a circuit housing, a battery charger and a battery compartment (19) thereat;
- b. first and second bulb holders (25) in said lamp housing means, a shield (35) between said bulb holders, and an aperture (37) in said shield so that if one bulb is extinguished the remaining bulb will still provide a signal;
- c. pairs of pig-tail lines leading from said circuit housing for connection to rails including a pair of lead and a pair of lag lines;
- d. a filter circuit (45) including a battery coupling connected to said pig-tail lines;
- e. a logic circuit (47) coupled to said filter circuit (45) including logic means to ascertain the presence and direction of a train in the lead and lag directions, said logic circuit having output side (73);
- and,
- f. a timer circuit coupled between said logic circuit and said bulbs including an enabling relay, said timer circuit providing a blinking signal to said bulbs.
4 more elements
Dependencies are inferred from the claim text.