US1319822A - Deadlight - Google Patents

Description

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Patented Oct. 28, 1919.

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HEADLIGHT. APPucAndu men 5.19. 19H.

Patented 00$. 28,1919.

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HEADLIGHT.

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Patented 0m 28,1919

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specification ot Letters Patent. Patented Oct. 28, 1919.

Application filed February 19, 1917. Serial No. 9,39%.

loskillerl in the'art to which it appertains to make and use the same.

My present invention relates to headlights and is particularly directed to an improved form of lens and to'an improved relative arrangement thereof, in respect to a con cave reflector and an electric light bulb within the latter. Generally stated,'the invention consists of the novel-construction and combination of parts hereinafter described iand defined in the claims.

In the accompanying drawings which I These electrical connections are more fully disclosed in-my pending application S illustrate the invcntiom'liln: characters indicate like parts throughoutthe several news.

Referring to the drawings:

ing a headlight embodying my invention and when-in a two-filanwnt light bulb is employed as a means for shifting the light source from the axis of the reflector to a point vertically above said axis;

Fig. 2 is an elevation looking at the inner face of the lens;

Fig. 3 is an enlarged fragmentary secline 3-3 of Fig.2; 1 Fig. 4 is a fragmentary view, in inner face elevation, showing a segmental portion of the lens;

Fig. 5 is a longitudinal sectiontakcn approximately on the line .55 of Figs. 2

and 4' 6, 7, 8, 9 10 and 11 are fragmentary,

sections taken, respectively, on the lines fi6,

7-7, 8-8, 9- -9, 1( 10 and 11-11 of Fig. 4;

Fig. 11 is ancnlargement of one of the rismatic sections taken, for'example, in

r Fig. 12 is aview corresponding to Fig. 1,

60 but showing a headlight having a single the clamping ring thereof,' the "numeral 15 the concave reflector, the numeral 16 the electric light bulb, and the numeral 17 the invention is conccrned,-|nay Figure 1 is a vertical axial section show- 'lc..=. is smooth, and flit and the proj beveled portions of the prisms are on inner-face thereof,-

lens. The reflector 15 is preferably a hyperbohc reflector and it is provided'with an axial passage through which the shankof the bulb 16 projects and is held by a, suitable support. This bulb support so far as this be of any suitable construction, but as shown, comprises a shank en ging sleeve 18 and a, tubular socket bog;

l9 screwed into a flanged hub 20 secured on the back of the reflector.

The bulbshown in Fig. 1 is a. two-filament bulb, the one filament having its hot spot at a and the other having its hot spot at b. The point a is at the axis of the reflector and referably also at the focal center thereof.

Hhe point I) is vertically above the axisof the reflector. By means of a three- lead circuit 21, 22 and 23, which includes a battery 24 and switches25 and 26, either of the two and'uscd as the light source of the headlight.

some. filed ofilate March 7 27, 1916, and entitled Headlights.

In Fig. 1'2, the-light bulb 16 is provided with a "single filament c, the hot spot of which is at the axis of the reflector and prefone of which isa switch'29.

'We will now consider the novel construction of the lens, the preferredform of which is illustrated in the drawings, and which,

' described in detail, is as follows:

Considerably more than'the upper half of this lens 17 is formed witlrradial prismatic segments, while considerably less than the lower half of said lens is preferably made filaments a or b may, at will, be energized in smooth'farallel surfaces. The segmental prisms ra ate from the center of the lens or from the axis of the. reflector and dimlnish in depth or thicknessfrorn the rim or outer portion thereof toward the said Preferably, the outer face of tlie center.

site sides of a vertical plane intersecting the axis of the reflector, incline orbevel in reverse directions, and in suchdirection-that they increase thethickness of the prism n ed generally downward with two important results, to wit, the greater part of the beam is thrown onto the road where it is required forgood lighting and a minor rtion thereof is spread out and diffuse so that the beam will not have a blinding effect, because there will be a gradual change from mild to more intense lightamas.

The two grou s of prisms found, the one in the up er right hand and the other in the upper le t hand quadrant of the lens, produce a drift of the beam in op site general directions circumferentially o the lens; and the rogressive bevel of the adjacent refractin surfaces of the prisms gives a progressi vgy increasing depressing refractory action of the rays of thelight beam.

What I claim is: g

,1. In a headlight, the combination with a reflector and a light source therein, of a lens having adjacent diverging prisms forming a serrated surface with ad acent beveled faces inclining in the same general direction and having their angles to the basal surface of the lens progressivel increasing in a direction circumferential from the vertical diameter toward the orizontal diameter of said lens,'said prisms being positioned in respect to said reflector and light source, to

intercept upwardly projected rays from said reflector and to refract and depress the same.

, 2. 'A headlight comprisin .a reflector, a light source and a lens, said ens having adv jacent divergin prisms forming a serrated surface with ad acent beveled faces inclining in the same general direction and which prisms, in a direction circumferentially from the vertical diameter toward the horizontal diameter of said lens, have a progressively increasing depressing refractory action, said 4 prisms bem positioned in respect to said re- Hector and ight source, so as to retract reflected rays that are ultimately in the upper portion of the projected beam.

3. A lens for headlights having radial prismattic segments, of progressively", increasing inclination to the plane oi the 'lens in opposite directions from the upper vertical segment thereof, the bevel of the said segmental prisms divrging in a direction circnmferentially away from the upper ver' tical segment.

4.'A lens for headlights having radial prismatic segments, of progressively increasmg inclination to the plane of the lens in opposite directions from the upper vertical segment thereof, the bevel of the said seg= mental prisms diverging in a direction circumferentially away-from the upper vertical se zonta having radial segmental prisms, the segments of which, progressively decrease in a downward direction.

5. A lens for headlights having radial prismatic segments that progressively in crease in their angle to the plane of the lens throughout a portion of said lens and rogressively decrease their angle to the p ane of the lens in other portions of t e lens.

In testimriny whereof I aliix my signature in presence of two witnesses.

OVERTON WINSTON. Witnesses CLARA Dnmums'r, B. G. Wzmnmn.

cut, and the said lens below the hori- 60

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