Back to results
US 5,030,886 AGranted
Self-checking circuit arrangement for operation of a searchlight signal
AssigneeUnion Switch & Signal Inc.
InventorJohn O. G. Darrow
Life of this patent
Estimating the term…
Abstract
The circuit arrangement of this invention includes a signal searchlight wherein the lamp is in an electrical series circuit with interlock contact switches. The switches interlock the display color lens such as yellow and green to control the electrical energization of the signal circuit. Logic control switching devices in a remote wayside control box supply signals through a cable to operate a bipolar device to selectively display the desired color.
Claims22
Searchlight signal circuit arrangement comprising:
- (a) signal means having a visible output in response to an electrical signal;
- (b) a first color interlock means located at said signal means for switching in response to the displayed color position of said signal means between a first current path when a first color is in the display position and a third current path when said first color is not in the display position;
- (c) a second color interlock means located at said signal means for switching in response to the displayed color position of said signal means between a second current path when a second color is in the display position and a fourth current path when said second color is not in the display position;
- (d) bipolar means located at said signal means for selectively displaying one of said first and second colors in response to an electrical signal indicative of color;
- and
- (e) said first color interlock means and said second color interlock means arranged in a series electric circuit with said signal means.
3 more elements
Dependencies are inferred from the claim text.