US1736902A - Headlight - Google Patents

Description

Nav., 2, w29. G. H. ausl-UNG 1,736,902.

A HEADLIGHT original Filed Nov. 25, 1924 2 sheets-sheet v1 Nov. 26, 1929. G. H. cusHlNG HEADLIGHT Original Filed Nov; 25, 1924 Patented Nov. 26, 1929 UNITED STATES PATENT OFFICE GEORGE II. ousHING, or WASHINGTON, DISTRICT OF COLUMBIA, AssIGNOn To cUsHi ING LAMP INCORPORATED, OF WASHINGTON, DISTRICT or COLUMBIA, A conroRA- TION. OF DELAWARE Application led November 25, 1924, Serial No. 752,214. Renewed April 12, 1929. Y

My invention relates to lamps, and more particularly to lamps used as headlights or other lamps equipped with reflectors.

An object of my invention is to provide a lamp in which the direct rays from the light 15 'the light rays in such manner as to prevent any glare to inconvenience or endanger pedestrians, or occupants of other vehicles .which may approach in the path oit-its light.

Another object of my invention is to provide a lamp which is strong and sturdy in construction, comprising but few parts which require no adjustment and are readily accessible -for cleaning and inspection.

While my invention is primarily designed to be used as an anti-glare device on the headlights of automobiles, street cars, railroad locomotives, mine locomotives or other vehicles, it is also adaptedto be used on street lamps, cap lamps used by miners, and in fact any Other/place where the use of a strong light is desired, but where an exposed light employed by one person'might prove annoying or dangerous to another. My reecting system may also be adapted to be used in lamps which utilize small candle power bulbs, as parking lamps for automobiles.

With these and other obj ects in view Which may be incident to luy-improvements, the invention consists in the parts and comblnations to be hereinafterset forth and claimed, with the understanding that the several necessary elements comprising my invention, may be varied in construction, proportions and arrangement, without departing from the spirit and scope of the appended claims.

In order to make my invention .more clearly understood, I have shown in the .accompanying drawings means for carrying the s ame into practical eect, without limit- 0, ing the improvements in their useful appli- HEADLIGH-T Fig. 5 is a sectional view along the line i 5 5 of Fig. 1.

ticularly to Fig. 1, I have shown my improved lamp comprising ,a housing 1 havingl a suitable -opening 2 to permit the entrance 'of aflamp socket 3, which is mounted upon the housing with suitable screw means 3 and lcarries a source of light in the form of an electric bulb .4. The housing is also provided with a door 5, hinged at 5", which provides means to inspect and clean the elementscontained within the housing.

Mounted within the housing 1 is a bracket or support 6 which is brazed or otherwise secured to the housing. This bracket extends upward along the side and is bent at an angleat the top', as indicated at 7. The bracket 6 supports a visor 8 and a secondary reflector 9.\

Surrounding the source of light 4 is a base member 10 mounted upon the bracket 6. The member 10 supports a primary parabolic shaped reflector 11. Attached to and extending beyond the primar reflector 11 is a concentrating shield 12 w ich is attached to the primary reflector support 10 by any suitable fastening means 13.-

Mounted in the concentrating shield 12 is a collecting lens 14, which is so `ground as to throw llViIght rays on the secondary reflector only. ounting, byl means of a screw attachment 15, for the collecting lens 14 is :provided. Opposite the collecting lens 14 is located the secondary reflector 9 which is mounted upon a suitable support 16. This support may be welded or aiiixed. to the bracket 6 by any suitable means, as screws17.

Referring to the drawings, and `more par- The secondary reflector 9 is formed of a series of parabolic shaped segments 18.

These segments are arranged in series,the

apex 19 of each reflector being joined to the outside 20 of eachsuccessive segment.

Extending around the seconda reflector 9 is a visor 8 which is cylindrical s aped and the sides 21 extend down as a curtain to kshieldthe light rays R from being reflected.

to the sides of the housing 1. The apex of the visor 8 extends along the upper portion the secondary reflector. The lig with the door 5 in the housing to lock the light diffusing lens in position. The diffusing lens 24 is mounted substantially at right angles to the general direction of vlight from the parabolic reecting surfaces of the secondary reflector 9. The rays emanating from the source of light 4: are reflected in the concentrating shield 12. They then pass through the collecting lens 14 and are projected upon the secondary reflector 9.

The primary reflector is a true parabola, a portion of the rays from which is deflected concentricall by the frustro-conical device or shield which becomes an extension of the parabola. This concentrating shield 12 is for the purpose of collecting and directing the ow of light rays which otherwise are not manipulated by the parabolic reflector.

The secondary lreflector 9 has its reiiecting surface divided into three sections 26, each section having an axis declining from the horizontal at a different angle and having the effect of causing three separate beams R of Vlight to strike the road at a predetermined distance ahead of the lamp. The declination of the axis depends on the height of the lamp Y and` the distance the light must be projected e so,

and the angle at which the light rises to the reflector.

The axis 27 of the structure formed b the primary reflector, the concentrating s ield and the collecting lens is shown as eing'in fixed focus. However, the axis 27 may be changed so that its inclination may assume any desired angle from the vertical, dependin upon the focus which is desired.

he three divisions of the secondary re Hector surfaces 26 are at the top opposite the collecting lens 14, and they are in the form of a parabolic surface, which surface has the same Width as the diameter of the beam. Extending down as a curtain from the sides of the parabolic surface are the sides 21 of the visor 8p These side guards 21 serve the double purpose of directing the ow of light without diffusion in the forward direction through the diusing lens 24, and of preventing any view of the secondary reflector 9 from any lateral position. The inner surfaces of the u visor 8 may be coated with a reflecting material to increase the degree of reection of the rays striking the inner surface from the reflector 9.

The bracket 6 is practically one solid piece extending from the housing to the primary reflector up the back of the lamp behind the secondary reflector and across the top to a point on the visor 8. When the bracket is placed within the housing 1, it carries with it the secondary reflector 9 which has been placed in such position on the bracket as to give the desired focus of the light rays upon the surface to be illuminated. The base ofA the bracket is drilled or otherwise provided with holes through which are inserted the fastening members'which ailix the base 10, which supports the primary reflector 11, to the housing 1. Having determined the proper focus and the angle of inclination of the vertical axis of the structure carrying the source of light, the relation existing between the position of the secondary reflector with respect to the collecting lens 14 is fixed for a given focus.

If the lamp becomes injured during use, or in some manner is thrown out of focus, the bracket 6 may be removed and is placed in a standard form which determines the angle at which it is bent, and in this manner readily adjusted so as to give the original focus. The entire lamp is easily` constructed since the separate parts can be made up and assembled in such a manner that each lamp,

predetermined focus.

Referring to Figure 2, vI have shown the mounting 1 which is provided as means to attach the lamp to a vehicle. The numeral 24 represents the light diffusing lens which is shown as being rectangular in shape. The parabolic reflecting'surfaces 26 of the secondary reflector 9 are shown directly to the rear of the diffusing lens 24. The top 22 ofthe housing is secured to the lower portion by a suitable fastening means`22.

Referring to Figure 3, the light rays R1, R2 and R3 are shown focused upon the surface S to be illuminated, but it will be noticed that the ray R1 intersects the ray R2 at a point P directly in front of the lamp, while the ray R3 intercepts the surface S at a point just below and in front of the lamp. This adjustment of the rays R1, R2 and R8, as indicated in this figure, eliminates the upward focus of the rays so that the light is always rojected downwardly upon the surface to e illuminated.

Referring-to Figure/4, the secondary re? Hector 9 is shown surrounded -by the visor 8. The cylindrical sides 21 of the visor are ing. On the surface of ,the secondary reflector 9, which reflector is formed of the parabolic surfaces 26, is shown the shape of 'the light rays projected from the collecting lens 14 upon the surfaces of the secondary reflector 9. The shape of these rays is in the form of a circle C. j The collecting lens 14 is ground in such manner as to throw the light rays only on the secondary reflecting surface.

Referring to Figure 5, the secondary reflector 91With its parabolic reflecting surfaces 26 is shown mounted upon the support or bracket 6 by means of the fastening screws 17. The cylindrical sides 21 of the visor 8 are shown extending down aroundthe secondary reflector and act as a curtain or shield for the rays of light reflected from the secondary reflector.

1. A lamp structure comprising a housing, a source of light therein, a primary reflector mounted Within the housing, a concentratingl shield made integral with the primary reflector, a collecting lens supported by the concentrating shield, an adjustable secondary reflector mounted on the housing opposite said collecting lens, a visor mounted on the housing and surrounding the secondary re-` flector, and a light diffusing lens in the path Vof the rays reflected by the secondary refiector.

2. A lamp structure comprising a housing, a source of light therein, a primary reflector mounted adjacent to said light source, a concentrating shield, a collecting lens mounted in the concentrating shield, a secondary re flector formed of a series of parabolic shaped segments, the vertex of each segment being joined to the terminal side of the preceding segment, said secondary reflector being mounted angularly opposite the collecting lens, a visor surrounding the secondary reflector, and a light diffusing lens.

3. An 'automobile lamp comprising a housing, a source of light'therein, a primary reflector mounted Within the housing, a con# centrating shield mounted upon the primary t reflector, a collectin lens supported by said concentrating shiel a secondary reflector mounted angularly opposite the collecting lens, a visor having cylindrical shaped sides extending around said secondary reflector, and a light diffusing lens positioned in a plane perpendicular to the rays reflected lfrom the secondary reflector.

4. An automobile headlight comprising a housing, a sourceof light therein, a primary reflector mounted within the housing, a concentrating shield mounted upon the primary reflector, a collecting lens supported by said concentrating shield, an adjustable secondary reflector angularly positioned in the path of the projected rays, a visor havin cylindrical shaped sides extending aroun said secondary reflector, the apex of the visor terminating in a point which lies in the plane of the housing above the secondary reflector, and a light diffusing lens mounted in the housing in the path of the rays from the secondary reflector. ,i

5. A lamp structure comprising a housing, a support member Within the housing of substantially the same configuration as the housing, a source of light mounted thereon, a primary reflector mounted upon the support member, a concentrating shield mounted uponthe primary reflector, a collecting lens positioned in said concentrating shield, a secondary reflector mounted on the support member and positioned angularly opposite the collecting lens, a'visor mounted upon the support member and surrounding the secondary reflector, and a light diffusing lens in the path of the rays reflected by the 'secondary reflector.

6. A lamp structure comprising a housing of substantiall rectangular cross section provided with a s ight-ly curved shoulder extension, a support member Within the housing .A

of substantially the same configuration as the housing, a source of light therein, a primary reflector surrounding the light source mounted upon the support member, a frusto-conical shaped concentrating shield mounted upon said vprimary reflector, a collecting lens mounted in the concentrating shield, a secondaryreflector formed of three parabolic shaped segments, the vertex of each segment In testimony whereof I aflix my signature. f

GEORGE H. cUsI-IING.

Images