Illumination – With static structure – With border – fence – gate or awning
Patent
1977-06-27
1979-05-01
Nelson, Peter A.
Illumination
With static structure
With border, fence, gate or awning
362 76, 362291, 362337, 362340, F21S 104, F21V 504
Patent
active
041527569
ABSTRACT:
An improved railroad crossing signal includes a deep dish parabolic reflector and an essentially flat plastic lens angled forward at the top relative to the axis of the reflector. The lens includes prism elements for laterally dispersing parallel light from the reflector more toward the crossing highway at near and far distances than toward the adjacent land. The lens also includes prism elements for vertically dispersing a portion of the light to produce uniform brightness before the signal.
REFERENCES:
patent: 1290567 (1919-01-01), Jester
patent: 1310721 (1919-07-01), Waggoner
patent: 1582326 (1926-04-01), Wood
patent: 2119370 (1938-05-01), Van Leunen
patent: 2855500 (1958-10-01), Holman
patent: 3235863 (1966-02-01), Lockhart
patent: 3267279 (1966-08-01), Doolittle
patent: 3522424 (1970-08-01), Fritsch
Barnes J. T.
Dinger Ronald W.
Hagen Robert A.
Hard, III Chester A.
Wrege Warren R.
General Signal Corporation
Nelson Peter A.
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