US 1903417 A
Description (OCR text may contain errors)
April 11, 1933.
J. A. GRANT HEADLIGHT Filed May 25, 193-1 2 Sheets-Sheet l JO MAL? Patented Apr. 11, 1933 UNITED STATES JOHN AUDLEY GRANT, OF ATLANTA, GEORGIA;
HEADLIGHT j Application filed Ma 25,
This invention relates to non-glaring head-: lights adapted especially for use on motor vehicles.
One of the principal objects of the invention is to provide'a headlight which includes a conical reflector unit of a construction which will result in producing a series of alternately disposed light and dark rings arranged in concentric relation whereby the usual reflection and glare which is present with a continuous reflecting surface will be avoided. c
Another object of the invention lies in'the provision of a pair of headlights arranged in 5 side by side relation and constructed to'cause the ring-shaped light rays to overlap in a manner to produce a solid white spot"on the ground immediately in front of the motor Vehicle.
With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustratedin 5 the accompanying drawings.
In the drawings Figure 1 is a horizontal section showing one of the headlights constructed in accord ance with my invention,
Figure 2 is a similar view of the other headligh i c,
Figure 3 is a front elevation of the headlight shown in Figure 1,
Figure 4 is a View diagrammatically illustrating the light and dark stripes produced by the headlight shown in Figure 1,
Figure 5 is a similar view but illustrating the light and dark stripes produced by the headlight shown in Figure 2, and
Figure 6 is a similar view but illustrating the superposed light and dark stripes produced by both headlights. 7
Referring to the accompanying drawings, my invention includes twoheadlights A and B which are arranged in side-by-Side relation on a motor vehicle C.
The headlight A includes a conical casing 5 having mounted therein a correspondingly shaped reflector unit 6 and an electric light bulb D at the inner end or vertex of the unit.
1931. Serial No. 539,939.
The unit 6 is provided in its inner surface wlth a series of ring-shaped surfaces or frustums 7 to 15 inclusive which are disposed in parallel planesperpendicular to the longitudinal axis of the conical unit. The' diameters of the ring-shaped surfaces or frustums increase in'succession from the inner end or vertex of the unit to the outerend or base thereof, and the surfaces of the rings or frustums are therefore joined by ringshaped shoulders or surfaces 16 13023 inclusive which are disposed in parallel planes perpendicular to the axis of the unit. The plane of each surface is inclined towardsthe vertex of the cone, and the circular lines of intersection between the ring-shapedltransverse shoulders or surfaces 16to 23 inclusive and the next smaller surface are indicated by the reference characters 16 to 23 inclusive. It will be understood that the angle of inclination of the surfaces 7 to 15 inclusive,'as Well as the number thereof, may be varied in "a manner to meet desired conditions;
, From the foregoing, it will be apparent that the light beams will intersect the circu-- lar lines 16 to 23 and strike the surfaces 8 to 15 betweenthe points 8 to 15 'and the next adjacent points v1'7 -to 23 inclusive,-and thenproject outwardly, as indicated in F igure 1, to thereby form a series of concentric light and dark rings, the dark rings being produced as a result of the light beams not being projected against the transverse ringshaped surfaces or shoulders 16 to 23 inclusive, and not against the portions of the surfaces 8 to 15 inclusive between the shoulders 16 to 23 inclusive and the points 8 to 15. The light rings are indicated by 7 to 15 inclusive and the dark rings are indicated by 8 to 15 inclusive. Thus a series of light and dark'stripes, circular in design, will be 7 projected forwardly in all directions, i. e.,'up and downand' right and left. A portioncof these stripes will be projected onto a the ground in front of the headlight as illustrated diagrammatically in Figure 4, the lightstripes beingindicated by the numerals 25 and the dark stripes by the numerals 26. Although I have illustrated the stripes r in straight lines it will be understood that in actual practice the stripes will be arcuate to some extent.
The headlight B is identical with the headlight A, except that the frustum surfaces 7 to 15 inclusive and the associated ring-shaped transverse shoulders or surfaces 16 to 23 in elusive, are advanced towards the base of the cone a distance suflicient to project the circular light and dark stripes 27 and 28 in alternate relation with respect to the stripes 25 and 26 projected'by the headlight A, as illustrated in Figure 5.
As a result, the projected series of circular stripes from both headlights will overlap and produce a white spot directly in front of the motor vehicle, as indicated at 30 in Figure 6. j
. It isv of course to be understood that the details of structure and arrangements of parts may be variously changed and modified without departing from the spirit and scope of my invention.
I claim I 1. The combination with a pair of non glaring headlights arranged side by side, each headlight comprising a conical reflector 'unit having its inner surfaee formed with a plurality of ring-shaped frustumsurfaces disposed to form a series of annular continuous alternately arranged reflecting and nonreflectingsurfaces, the ring-shaped frustum surfaces of one unit being respectively disposed'in' advance of the corresponding surfacesand shoulders of the other unit whereby the surfaces andshoulders of the respective reflector units will be arranged intermediately abreast.
2. The combination with ,a pair of nonlaring headlights arranged side by side, each headlight comprising a conical reflector unit having its inner surface formed with a plurality of annular continuous ring-shaped frustum surfaces disposed in stepped relation to form a series of alternately arrangedreflecting and non-reflecting surfaces, the ring-shaped frustum surfaces of one unit being respectively disposed in advance of the corresponding surfaces and shoulders of the other unit whereby the surfaces and shoulders of the respective reflector units will be arranged intermediately abreast.
3. The combination with a pair of nonglaring headlights arranged side by side, each headlight comprising a conical reflector unit havingits inner surface formed with a plurality of ring-shaped frustum surfaces, disposed to form a series of annular continuous alternately arranged reflecting and non-refleeting surfaces, the diameters ofthe ringshaped frustum surfaces respectively increasing in succession from the vertex to the base of the reflector unit, the frustum' surfaces of adjacent rings being united by a circular shoulder disposed in a plane perpendicular to the axis of the unit, the ring-shaped frustum ders so disposedrelatively to: the light source 7 that each shoulder is capable of casting a shadow over a portion of the adjacent reflecting surface whereby said shoulders cooperate with the reflecting surfaces in providing annular continuous alternatelyanranged reflecting and non-reflecting surfaces.
5. I11 21. non-glare headlight, a. conical rcflector, a light source within the reflector adj acent the apex of the cone, said reflector having its inner surface formed with a plurality of ring-shaped frusto-coniform reflecting surfaces stepped progressively outward with respect one to another and so disposed relatively to the light source that each reflecting surface includes an annular portion receiving rays of light directly from the source of light and an annular portion shaded by reason of its stepped relation to the reflecting surface most nearly adjacent thereto in the direction of said light source, and said refleeting surfaces bearing common angular relation to the axis of the reflector whereby to cooperate with the light source in project ing forward substantially concentrically spaced tubular pencils of light.
In testimony whereof, I have hereunto sub scribed my name.
, JOHN AUDLEY GRANT.