US1175840A - Search-light. - Google Patents

Description

I. F. TALBOT.

SEARCH LIGHT.

APPLICATION FILED MAY I7, I915.

Patented Mar. 14, 1916.

TED STATES PATENT @FFTQE.

IVAN F. TALBOT, OF WAL-LA WALLA, WASHINGTON, ASSIGNOR TO THE WESTERN PROMOTING AND MANUFACTURING CO. LTD., OF BOISE, IDAHO, A CORPORATION OF IDAHO.

Specification of Letters Patent.

SEARCH-LIGHT.

Patented Mar. Ml, rare.

To all whom it may concern Be it known'that I, IVAN F. TALBOT, a citizen of the United States, residing at Walla Walla, in the county of Walla Walla and State of Washington, have invented new and useful Improvements in Search-Lights, of which the following is a specification.

This invention relates to searchlights applicable to locomotives, automobiles and other vehicles or usable as an ordinary searchlight on a building or fixed support or base, and the primary object of the same is to-provide a searchlight wherein the light generating means is disposed'outside of the space between the reflector and the lens to avoid intercepting or in the least diffusing or disturbing the beam of light cast by the reflector through the lens so as to produce a positive light beam and a stronger reflective action and materially increase the distance of projection of the beam with a more satisfactory and definite illumination and light spot relatively to the object upon which the beam may be thrown.

A further object of the invention is to provide a searchlight having the interior space between the main body of the reflector and the lens wholly cleared of light generating means and to arrange the latter so as to cast rays of light inwardly into the device toward a central point of concentration and then reflect the concentrated light rays in the form of a beam through a lens which may be of the condenser or any other type and thereby produce a positively defined beam of light which may be projected a greater distance with a clearer illumination than would be possible in a searchlight having light generating means interposed between the main reflecting surface and the lens.

With these and other objects and advantages in view the invention consists in the preferred construction and arrangement of parts which will be more fully hereinafter described and claimed.

In the drawing: Figure 1 is a front elevation of a searchlight embodying the features of the invention. Fig. 2 is a horizontal section taken in the plane of the line 22, Fig. 1. Fig. 3 is a transverse vertical section taken in the plane of the line 33, Fig. 1. Fig. 4 is a horizontal section taken in the plane of the line 4 4, Fig. 3.

The numeral 5 designates a light casing which is in parabolic form and has an inner extended reflecting surface 6. The casing is closed, and in a front rim 7 at the center a lens 8 is mounted and secured, said lens be- 7 ing of any preferred type and may have condensing characteristics. The front of the casing 5 at diametrically opposite points is formed with openings 9, and coinciding with and projecting outwardly from these openings are frusto-conical tubes 10 which have a forwardly divergent arrangement relatively to each other. The interior of the casing 5 is wholly free of light generating means and there is no intercepting device of any sort between the lens and the extensive reflecting surface 6 of the casing. The frusto-conical tubes 10 are angularly disposed, as hereinbefore indicated, and the longitudinal axes thereof are in alinem'ent with the rear central portion of the reflecting surface 6 of the casing 5, as indicated by the dotted lines 11, as shown by Fig. 2; and the form of the reflecting surface 6 is such that all the rays of light entering the interior of the casing are thrown back to the central point, as at 12, which is also the intersecting points of the positive rays of light projected rearwardly through the tubes 10. The light generating means in the present instance comprise two lamp casings 13 attached to the outer ends of the tubes 10, the rear portions of the said lamp casings 13 having openings 14 therein, one in each, in which the outer reduced ends of the tubes 10 are fitted and secured. The lamp casings 13 have suitable light generating means, such as electric bulbs 15, disposed therein and held by any preferred means; and disposed outside of the light generating means or electric'bulbs 15 are parabolic reflectors 16 which are secured to the inner side of the casings 13. The top 17 of each casing is formed with perforations, as at 18, and thereover is a convex hood 19'forming a ventilating space over the top of each lamp casing 13. The bottom 20 of each lamp cas ing 13 is also formed with perforations 21,

and mounted closely against this bottom and held within the lamp is a regulating damper 22 which is also perforated, as at. 23', the damper 22 being shiftable to more or less open or close the openings 21 in the bottom 20, and for convenience in adjusting the said damper it is provided with an outwardly projecting handle stem 24 movable in a slot 25 in the adjacent portion of the casing, as shown by Fig. 4.

From the foregoing it will be seen that the light generating means embodying the lamp casing may be very readily ventilated and maintained at a low temperature, the. damper 22 being opened or closed inaccordance with the requirements as to admission of air and the surrounding atmospheric conditions and winds. The ventilation of the light generating means will be found exceptionally advantageous in the general operation of the searchlight.

The light rays from the light generating means are thrown inwardly through the tubes 10 by the reflectors 16 and are concentrated at the rear central point 12 of the reflecting surface 6 or at the back of the casing 5, and all of the scattering rays of light entering the casing 5 are likewise thrown back to the central point 12 in view of the shape of the said casing and its reflecting surface 6, and from the said central point 12 the light rays are reflected forwardly in the form of a beam through the lens 8 and by the latter projected to a considerable distance away from the searchlight with a greater concentration and illuminating characteristic owing to the fact that there is no intercepting means or any device that might break up the reflecting rays of light within the casing 5 between any part of the-reflecting surface -6 and the lens 8, and as a consequence the improved searchlight is rendered more efiicient in all of its applications and uses. It will be understood that the proportions and dimensions of the several parts of the light may be varied at will and the number of light generating means and tubes 10 may also be increased if desired without in the least departing from the spirit of the invention.

What is claimed 1s:

1. A searchlight having a casing with a reflecting surface, a lens in the center at a distance in front of the said reflecting suri to face of' the casing, the lens having its center disposed in almement with the center of the reflecting surface, and fully inclosed light generatmg means arranged in advance of the lens and in converglng angular alinement with relation to the center of the reflecting surface of the casing, whereby the rays of light from the light generating means are wholly excluded from the lens prior to engagement with the said reflecting surface to cause the rays of light to be directly reflected forwardly through the lens without the least interception or diffusion.

2. A searchlight having a parabolic reflecting surface reduced toward its rear central concentrating portion, a lens mounted in advance of and in light receiving position relatively to the said rear central concentrating portion of the reflecting surface, and light generating means fully inclosed outside of the space between the lens and the reflecting surface to prevent any light therefrom from reaching the lens,-;-the light generating means with the inclosures therefor being convergingly disposed to combine the light rays at the said central concentrating portion of the reflecting surface, whereby rays of light are reflected to the lens without interception or diffusion between the lens and reflecting surface to intensify the rays of light projected outwardly from the lens.

3. A searchlight having: a reflecting surface diverging toward the front thereof, a lens mounted in the front portion of the light in advance of and in line with the rear central reduced portion of the reflecting surface, tubes connected to the front of the light on opposite sides of the lens and arranged to converge toward the rear reduced portion of the said reflecting surface, and

light generating means connected to said 1 tubes in advance of'the lens and having reflectors therein operating toconverge. the light rays toward therear reduced portion of said reflecting surface, rays of light from the light generating means being wholly excluded from the lens prior to engagement with the said reflecting surface.

4. A searchlight having a casing with a reflecting surface converging toward the rear central portion of the casing, a lens mounted in the center of the front of the casing, tubes secured to the front of the easlng at diametrically opposite points with relation to the lens and arranged in converging angles relativel to the rear central ortion of the said re ecting surface, and

.ight generating: means connected to. said tubes in advance of the lens and; rovided the front portion of the casin in advance of the reflecting surface, and light generating means disposed on opposite sides ofthe lens andprovided with inclosures arranged to have the light rays thereof converged to ward the rear central portion of the reflecting surface and Wholly excluded from the lens except by means of the reflecting snrface, the inclosures for the light generating Ineans being provided with ventilating devices.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

IVAN F. TALBOT. Witnesses:

CHAS. S. HYER, SADIE STANFORD WHITE.

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