US1564486A - Cab lamp - Google Patents

Description

C. P. MCGINNIS ET AL Dec. 8 1925- CAB LAMP Filed Dec. 5. 1923 Patented Dec. d, 1925.

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CRAWFORD P. MCGINNIS AND CHARLES VJ. BAKE. 0F CHICAGO, LLNC-TS, ASSGNOR-S TO THE PYLE-NATIONAL COllIPNY, 0F C-ETGAGO. ILLTNGIS, A CORPORATION OF NEW JERSEY.

GAB LAMP.

Application filed December 5` 1923.

To all whom t may concern.'

Be it known that we, CRAwroRD l). illo- GINNis and @imams W. Dlikn, being citizens of the United States, and residents of Chicago, in the county of Cook and State of Illinois (whose post-oilice address is 133e North Kostner Avenue, Chicago, Tllinois), have invented a certain new and useful Tmprovement in Cab Lamps, of which the following is a specification.

Uur invention relates to improvements in electric lights for use in connection with railroad locomotive cabs for furnishing light to illuminate gauges, dials and the like. It has for one object to provide a new and improved light which can be easily adjusted in position7 wherein the electric light bulb may be protected and at the same time easily removed for renewal and wherein the light can be concentrated in a controlled ray so as to light up only the part which is to be illuminated and prevent glare which would interfere with the engineer and fireman and make it impossible for them to see signals from the outside; Other objects will appear from time to time in the specification.

Our invention is illustrated more or less diagrammatically in the accompanying drawings, wherein- Figure l is a section through the lamp;

Figure 2 is an elevation.

Like parts are indicated by like characters throughout the specification and drawings.

A. is the cab wall or any other suitable stanchion or support. A1 is a bracket bolted thereto. This bracket terminates in a spherical centrally apertured member A2. A3 is a curved washer' adapted to ride on the outside thereof. Passing through this washer and through the aperture is a cap screw A4 which is screw threaded into a foot A5 having a spherical surface to engage the inside of the member A2. A. is a lamp support or base integral with the foot A5, flanged at AT and provided with a rearwardly extending threaded hollow boss A8.

B is an electric light socket threaded into the support A, the support being apertured to make thispossible. B1 is a socket within the lamp support closed by the base B to leave room for the electric conductors B2, B3

Serial No. 678,586.

which pass inwardly through theccnduit B4 threaded in the boss il?, and terminate at the electric light base ll.

C is a housing of metal or other suitable material. Tt is relatively stiff and rigid and preferably opaque though it might bev more or less translucent. Tt is carried on the outside of the annular ring il and has a plurality of bayonet joint slots C1 associated with the pins C2 on the ring A? and has a boss C3 engaged by a screw C* threaded in the ring El to hold the parts together and prevent unintentional disengaging of the bayonet joints. C is a reiiector located inside the housing C having a curved surface associated with the electric light bulb B5. This reflector is adjustably mounted on the wall of the housing C by the bolt Cd.

Opposite the reflector C5, the housing C is apertured as at D and the wall of the housing forms a cylindrical barrel D1 in line with this aperture. D2 is a lens cell slidable in the barrel Dl and held in' position thereon by a screw D3. The outer end of this cell carries a lens D4 through which pass the direct light rays from the light source or the bulb as well as reflected rays from the reflector. This arrangement of barrel, lens and reflector insures that there will be a minimum of defused light, that the light ray or beam will be directed only upon the element which it is desired to illuminate.

Tt will be evident that while we have shown in our drawings an operative device still many changes might be made in the size, shape and arrangement of parts without departing materially from the spirit of our invention and we wish, therefore, that our drawings be regarded as in a sense diagrammatic.

The use and operation of our invention are as follows:

The electric bulb and the exposed electrical connection between it and the base are entirely enclosed within the co-ntinuous housing. This housing being more or less rigid and sti prevents accidental breakage of the bulb itself, protects the surface of the bulb and electrical connections from dirt, dust, moisture and the like and makes it necessary only to clean the small rigid and durable lens. The conduit associated lll with the base protects the Wiring and there is little danger of short circuiting or lamp trouble. The ball and socket n'iounting for the lamp makes it possible to direct the ray of light in any desired direction Within reasonable limits by loosening the cap screw and moving the base and Was-sher in any desired direction, limited only by the if: f the aperture in the l.,-racl-;et to p; position the light.

'lihe cylindrical extension containing the lens cell together with tho lens reilector pre-vent the dlli'ueion ot light raf/s and insures that the light will be directed in a concentric parallel beam 'from the light source upon the object, such as indicator, gauge or dial, which it desired to'illuininate. By using` the rctlecior anal the lens it is possible to get a beam oi" considerable intensity. rl'his nialces it po )le to illuminate objects i n a light so 'ree placed at a distance so that it is not nec ssary lo. have the light itself inunediately djacent thc object to he illuminated.

We claim:

l. i cab lamp comprising a base on which a light source may be mounted, a rigid, opaque housing closely surrounding the light source and removably mounted on the base, a cylindrical projection from one side ot the housing and a lens cll removably mounted therein, a reector adjustably mounted Within the housing on the Wall thereof behind the light source and in line with the lens cell.

2. A cah lamp comprising a base, a lamp supporting sleeve threaded therein, a pertoi-ation extending through the base co1nniunicating with the aperture in which the lamp supporting sleeve is threaded, a conduit communicating with such perforation, a light source threaded in the supporting sleeve, a flange on the base, an opaque housing removably mounted on the lian-ge enclosing the light source, a cylindrical'projection on one side ot the housing and a lens cell remoxfably socketed therein, a toot projecting 'from the base, u spherical portion engaging the ioot and means lor locking the two together in adjusted position, and a reflector contained Within the housing in line with the lens socket mounted on the Wall ot the housing.

lf3. A cab-lamp comprising a base on which a light source may be mounted, a rigid opaque housing closely surrounding the light source, and reinoifably mounted on the hase, a supporting bracket for said base, a. light socket threaded in the hase, a light source threaded in the socket, a conduit independent ot the bracketV leading from the base, and electric conductors therein terminating at the light socket, a cylindrical projection trom one side ot' the housing, and a lens cell removably mounted therein, and a reflector' mounted Within the housing on the Wall thereof behind the light source and in line with the lens cell.

Signed at Chicago, County of Cook and State ot illinois, this 30th day of November, i923.

CRAWFORD MCGINNIS. CHARLES W. BAKE.

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