US1278338A

US1278338A - Signal.

Info

Publication number: US1278338A
Application number: US81315514A
Authority: US
Inventors: Clinton O Harrington
Original assignee: Union Switch and Signal Inc
Current assignee: Hitachi Rail STS USA Inc
Priority date: 1914-01-20
Filing date: 1914-01-20
Publication date: 1918-09-10
Anticipated expiration: 1935-09-10

Description

C. O. HARRiNGTON.

SIGNAL.

APPLICATION FILED JAN 20. 1914.

PatentdQpt 10, 1918 mvzmmm WITNESSES 00 X5 mm pos iniented certain new and the portion which is CLIETTUN C. HARRENGTGET, 9F EDGE'WOOID ElJR OUGl-I, PEN TSYLVAHIA, ASSZGNOR T0 THE UNION SW'ITGH d: SIGNAL COI/IPAi .PDZBATEQN D33 PENHSYLVMIIA.

Specification of Letters Patent.

IT, 01 SW'ZSSVALE, EENNSYLVMJIA, A C012,-

Sept. Zl

are, or course, mounted in a suitable "serial.

.1, mm m .1 2 0,038.

. Application filed January 20, 1on

1 m lamp (ZZZ whom 2'25" concern: I

Be it known that I, CLINTON 0. HARRI G- TON, a citizen or" the United States, residing at Edgewood borough, -in the county of Allegheny and State of Pennsylvania, have useful Improve ments in Signals, of which the following is a specification.

My invention relate to signals and particularly to signals of the type in whicha source of light is employed for giving indications both at night and in daylight. Signals embodying ticularly adapted for use in railway signaling, although their adaptation is not lin'iited to this particular use. /Vhen a signal of this type is used on a railway curve, the beam of light projected by the signal should be Visible from all points on the curve in the rear of thesignal. Hence, this beam is preferably elongated in a horizontal direction, but not in a vertical direction because vertical dispersion would mean wasted light.

Furthermore, in order to pnovide somewhat uniform illumination throughout the curve, the beam is preferably of varying intensity, l projected toward the points on the curve farthest from being of greater intensity than the portion which is projected toward thepoints on the curve nearer the signal. One reatnre of my '111V8ni31011 is the provision or a-signal which will project an elongated beam of light, dii ferent portions of the beam being of different intensities.

I will describe one form of bodying my invention and will then point out the novel features thereof in claims.

In the accompanying is a View showing in front elevation one form of signal embodying my invention. Fig. 52 is a curve showing the intensity of light at: different points in the plane llll of Fig. 1. Fig. 3 is a diagrammatic View showing a railway curve having applied thereto a signal of the form shown lllFlg. 1. Similar reference characters refer to similar parts in each of the views. I 1 Referring first to Fig. 1, the signal here shown comprises a paraboloidal reflector and a source or" light, 2, which latter, as here shown, is an electric incandescent lamp. The reflector R 'is preferably formed of glass, theoutside surface of which is silvered as in mirror construction; The reflector and my invention are par-- the signal 7 signal em drawing, Figure l.

framework in such manner that the lamp is located substantially at the focus of the reflector, but to simplify the drawings the ire iework is omitted.

The reflector l, as here shown, comprises a main section X and seven sections X X X X X X and X which are displaced trozn section X in'the following manner: Sections X I? are each displaced a slight amount, preferably by swinging around the focus as a center and in a direction parallel. to line ll l'l.

tions similarly displaced a.

X X are slightly greater amount. Sections 2?, K

are similarly displaced a slightly greater amount than sections BF, and section K is similarly displaced a slightly greater amount than sections X Sections X are together smaller than section X, sections X are together smaller than sections X, sections K are together smaller than sections X and section K is smaller than the sum of sections X It will be secn,' the eit'ore, that I provide a reflector comprising sections of progressi ely decreasing size-which sections displaced in progressivelyv decreasing amounts. The intensity of the light proected from this reflector is substantially as indicated in Fig. 2, from which it will be seen that the rays from section K produce a zone C of relativelyhigh intensity adjacent one end of the beam, the rays @irorn sections X produce a zone of lower intensity nent to Zone C, and so on down to zone'G which is producedby the rays from ection X and which intensity of any part of the beam. In other words, the beam Varies progressively in intensity rom a maximum value adjacent one end to aminiinum value adjacent the other.

Referring now particularly to Fig. 3, B designates a railway curve of 2 curvature, 1500 feet long. Located at one end of this curve is a signal S which is constructed as shown in 1. This signal is so placed that the rays of light projected from sec- 'tionX of the reflector are directed toward portion C otthe curve, this portion being the fifth of the curve located at the end farthest from the signal. This part of the beam is or the highest intensit as indicated in 2. The rays from sections X X are directed toward portion l) of the curve, this portion being the fifth of the curve next to See zone is of the lowest portion C. This part -ot' the beam is of lower intensity, but portion D of the curve is nearer to the signal than portion C, hence the candle-foot. illumination'on portion D is substantially the same as on portion C so that the light reaching these portions appears to be o'l'substantially liancy to an observer moving along the curve. Similarly, the rays from sections X are projected toward portion E of the curve,

those from sections X3 toward portion E,

scribed only one form of signal embodying my invention, it is understood that various changes and modifications be made therein within the scope of claims without departing from the spirit and scope of my invention. I Having thus described my invention, What I claim is: i

1. A signal comprising a source of light, and a reflector adapted to project a beam from said source, sections of said-reflector of progressively decreasing size being displaced at progressively increasing distances from the remainder of the reflector, whereby the beam projected therefrom is elongated and varies progressi ely in intensity from a maxmay the same br1l-- the appended.

imum value adjacent one end to value adjacent the other.

2'. A signal comprising asource of light, and a reflector adapted to project a beam of light from said source, sections of said device of progressively decreasing size being displaced at progressively increasing distances from the remainder of the device, whereby the beam projected therefrom is elongated and varies progressively in intensity froin'a maximum value adjacent one end to a minimunrvalue adjacent the other.

8. A signal comprising a source or light,

a minimum and a reflector adapted to project a beam 0t light from said source, the half of said rethrough its aXis being sections of progressively decreasing size, and the other half of the reflector on the other side of said plane being symmetrically divided into radial sections of progressively decreasing size, and the said sections on opposite sides of said plane being: displaced from the first and largest section in regre s-- sively increasing amounts, Where y the beam projected from the signal is elongated in the direction of said plane and varies progressively in intensity from a'inaxiinum,

value at one end to a minimum value at the other.

I In testimony whereof I affix my signature in presence of two Witnesses.

CLINTON HARRINGTON. Witnesses:

A. HERMAN WEGNER, .i R; L. Kis'rmn liector on' one side of a plane passing divided into radial