US 1595533 A
Description (OCR text may contain errors)
Aug. 10 1926. 1,595,533
0. N. WEEMS REFLECTOR Filed August 13, 1925 Patented Aug. 10, 1926.
UNITED STATES CHESTER N. WEEKS, OF ATLANTA, GEORGIA.
Application filed August 13, 1925. Serial 1T0. 49,892.
This invention relates to an improved reflector for headlights which will function without the use of diffusing lens placed in the path of the light and will spread and 5 diffuse the headlight beam in horizontal directions without materially distorting the headlight beam in vertical direction.
The invention is particularly designed for use on such reflectors which, in themselves,
will direct the path of light beam downward in relation to the axisof'the reflector and spread the light beam so as to give broad illumination on the roadway and at the same time so diffuse the light in a horizontal direc- 1 tion that a definite light pattern with sharp outline will not result. There will, however, be produced a soft, diffused field of light on the roadway and at the same time the beam will not be materially diffused or spread in vertical direction, thus preventing any pore tion of the light beam striking above the level of the reflector.
. The invention consists in placing flattened portions and arranging them radially with respect to the reflector axis and disposing them in such a manner on the reflector surface as to roduce the desired result.
It is understood that my invention may be used with any reflector of the parabolic type but I prefer to use it and I have illustrated it on the type of offset reflector described inmy United States Patent #l,398,987, issued December 6, 1921.
The invention is illustrated in the acc'omli' panying drawings in which Figure 1 shows a reflector ofmy improved type in vertical section. Figure 2 is a front view) of the reflector shown in Fi ure' 1 and Figure 3 is a view on an enlargef scale taken on line ti -3 40 in Figure 2. I
The ty e' of reflector that I have shown consists of an upper reflector 10 and a lower reflector 11, which, while they may be of the parabolic type, are illustrated as of the kind that will reflect rays passing from'the filament 12 of the lamp so that they are inclined downwardly relative to the horizontal axis of the reflector.
These upper and lower halves of the re- 59 flector unit of the headlight are joined in horizontal plane through the axis of revolution and 1 show a horizontal dividing plate 13 with a small shield 14 for preventing di- .dia1ly projecting from the, point a rect rays from the filament from proceeding upwardly and forwardly from the lamp.
On the reflector I place flattened portions 15, these being disposed on what might be termed vertical quadrants of the lamp leaving the side portions 16, which might be called the horizontal parts of the reflector, in their normal or unbroken curved form.
The flattened portions 15 are arranged rajacent the outer edge or forward edge of the reflector toward the centre for the desired distance, it being desirable to space these flattened portions one from the other and I also usually arrange other flattened portions 17 which are placed between the portions 15, these portions 17 extending .about midway toward the centre 'of the reflector. The usual way of formin these spaces is by simply flattening small radial strips of the reflector surface in planes at right angles to the axis of revolution.
When in operation, the flattened rtions 15 and 17 of the reflector tend to'di use and spread the light beam and as these reflecting surfaces are flat and not circular and are in planes intersecting at right angles to the reflector axis, the light which strikes such flattened portions will be spread by an amount equal to the angle subtended by the width of the flute or flattened portion with the focus point which is represented by the filament 12. i
.The radial flattened portions laced in the upper and lower or vertical qua rants of the reflector will diifuse andwiden the light beam in horizontal direction owing to the fact that the spread must necessarily be at right angles to the radial direction of the flattened portion.
To prevent spreading the beam and diffusin it in substantially vertical planes, I place these flat reflecting portions only in the top and bottom portions of the reflector.
It is understood that the flattened portions refer to such ortions in the metal which are flattened in o anes at right angles with the axis of revolution of the reflector whereas the other portions of the reflector are cilcular and in these planes. In the lanes which include the horizontal axiso revolution of the reflector, the intersections with the metal comprising the portiew .in each case are curved substantially par- 2. Areflector with upper and lower halves l0 'allelto the curves on the other portions of both designed to direct rays downward in the reflector. relation to the axis of the reflector, ,the 0p-.
I claim: posed vertical quadrants of the reflector hav- 5 1. A reflector with upper and lower halves ing radially arranged spaced flattened porboth designed to direct rays downward in tions, the alternate portions being shorter l5 relation to the axis of the reflector, the opin length than the bthers. posed vertical quadrants, of the reflector In'testirnony where of I aflix my signature. having radially arranged flattened portions. CHESTER N. -WEEMS.