US1028721A - Illuminator. - Google Patents

Description

T. 0. HEISEY & A. J. SANFORD."

ILLUMINATOR.

APPLICATION FILED AUG.16, 1910. 1,928,72 1 Patented June 4, 1912. v I 2 SHEETSSHEET 1.

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I ILLUMINATOR. APPLICATION PILE1 AUG. 16, 1910.

Patented June 4, 1912. v

UNITED STATES PATENT OFFICE.

- T'Hoams CLARENCE HEISEY AND ANDREW J. sA'NroRD, or NEWARK, OHIO, AssIeNoRs TO A. H. HEISEY & 00., mm, or NEWARK, OHIO, A. CORPORATION OF WEST VIB- GIN IA.

ILLUMINATOR.

1,028,721, I Specification of Letters Patent. Patented June 4,, 1912, I

Application filed August 16, 1910. Serial No. 577,413.

I To all whom it may concern:

Be it known that we, THOMAS CLARENCE llmssv and AN'nREw J. SANFORD,- residents of the city of Newark, in the county of Licking and State of'Ohio', have invented a new and useful Improvement in Illuminators; and we do hereby declare the following to be a full, clear, and exact description thereof.

Our invention relates to illuminators in general, and particularly to that class of illuminators used as head lights or search lights for automobiles, motor boats or locomotives, Its object is to dispense with the metallic 'or mirrored reflector hitherto employed in the rear of the source of light to direct the rearwardly emitted rays forwardly through the glass pane or other diffusing device employed, and to substitute therefor a reflector which dispenses entirely with a mercury or other mirror, and has a relatively indestructible reflecting surface.

To this end our invention comprises an illuminator having a casing with an annular flange at its rear port-ion, a reflector provided with an annular edge snnllar 1n shape to said flange, and a gasket of-elastec' materialbetween the. flange and the reflector edge; as well. as other improvements as hereinafter set forth. H

In the drawings illustrating'our invention, Figure 1 is a vertical longitudinal .section of a headlight of a type generally employed in, motor cars illustrating a glass reflector embodying'my invention. Fig. 2 is a rear elevation partly broken away showing the prismatic surface employed in Fig. 1- in the reflector, and 3 is a like view showing another form of reflector.

The illuminator 1, illustrated in Fig. 1,

has the burner, 2, adapted to, admit acetylene or like gas, or act as a conduit for electric wires, to produce the light, 3, which is intended to represent diagrammatically any source of light, gas, incandescent or any other. i It has the casing 4, of brass or other metal provided with the ventilator, 5, having holes 6, which admit air through the aperture, 7. It is also shown as provided with the glass pane, 8, carried by the annular sleeve, 9, which'fits the annular flange, 10, attached to the casing 4, of the illuminator or head light. These parts, however, in themselves, form no part of our invention,

and it will be understood that they may be varied to suit the particular purpose desired.

The transparent reflector, 11, is composed of glass havlng the, pr smatic outerfsurface,

12. The inner surface, 13, is preferably, of smooth curved form. The reflector, 11, is preferably provided with the annular edge portion, 14, provided with the annular groove, 14. -The gasket, 16, of rubber, asbestos or other padding material fitswithin and is secured to the flanged sleeve, 17, of

the illuminator 1', said sleeve being set at an" angle corresponding to the inclination ofthe edge, 14, of .thereflector, 12, relative to the axis of the illuminator. is inserted. within the sleeve, 17, in setting The reflector, 12,,

up the device by hand pressure and'is 'securely held therein by friction with the gasket, 16, which fits within the groove, 14',

' ofits edge, 14. ,The reflector is preferably secured therein by the end casing or cap, 18, which fits or'e'r the annular flange, 19, of the casing, 4, being provided as shown with thev head, 20, -which abuts against the like bead, 21, carried by the said casing. The reflector is attached securelythcreto by the spring clips, 22, as illustrated. The casing or cap,

18, shown, extends entirely across the rear of the reflector, so that, in conjunction with the gasket, 16, it prey'ents the entrance and collection of moisture, dust and dirt behind the reflector, 11. The spring clips, 22, riv eted to the-casing, 4, bear against the mar gin of the reflector 11, and hold it accurately 111 position. As illustrated in'Fig. 3', the

reflector, 40, may be carried in rearwardly exposed position, the attaching cap, 41, be-

ing the reflector, 40, only at its edge portion mg in the form of an annular'flange embracand being attached to the casing, 4, of the illuminator in a manner similar to that illus trated in Fig. 1. I

The reflect-or, 11, illustrated has the prismatic surface, 12, each prism, 12, having the faces 12 and 12 which are preferably at an angle of about 45 with a radius r. drawn from the .mean source of light '3. The inner-curved surface of the reflectoris preferabl y concave relative to the source of light, being approximately that of a sphere having a l'lltlllls and'eenter slightly different from but near to the curved surface, 15,

which forms the pitch surface for ,the prisms, l2. The effect of this prismatic construction of glass reflector, is to completely reflect substantially all the rays of light emitted in a rearward direction from the source of light, 3. This occurs in all cases where any pair of prismatic faces, 12 and 12" are set at a eater angle with a perpendicular to a radius r from the source of li ght'a drawn to any given point of suchv surface than the greatest angle at which .fl'lighflstrik-ing said surface will passtherethrough, or the angle of total reflection. In practice We prefer to employ prisms of the nature illustrated, the smooth inner surface, 11, acting to refract the rays only in a ver slight manner andso as to provide for t-hlr reflection by the outer prismatic sur lfa'ce,'12, in the desired direction. As illustrated in Fig. '1, the reflected raysof light would be directed backwardly substantially parallel and opposite to their direction of original incidence". Thus a ray of light 1' striking the prismatic faces,-12 and 12 of the prism 1-2, would be reflected as illustrated in dotted lines backwardly through 1 the source of light 3, and emit-ted in nearly same, an

the same direction as. a ray f thrown out originally from the mean source of light a in a direction opposite to that of the ray 7. P What we claim is:

1. .An .illuminator provided with a source' 'of light and a casing around the inwardly extending annular flange formed integral with said casing, a reflector provided with an annular edge engaging said flange, and a gasket. of elastic materlal between said flange nular edge. 2.-An illuminator having'a source of and said anlight and a casing surrounding the samev and having an annular inclined flange in .its rear portion, a reflector provided with an annular inclined edge having a groove thereln and a gasket of elastic material seated in said groove and holding said reflector within said flange. i

3. An illuminator having a source of light and a casing around the same, said casing having an annular inclined flange in its rear portion, a reflector provided with an annular inclined edge adapted to mate .witlnn said flange and having a groove in annular inclined edge adapted to mate within said flange and havlng a groove within said edge, agasketof elastic material carried within said groove and adapted to support said reflector-within said flange, and a cap around said reflector and provided with means attachingit to said casing.

5. An illuminator/ having a source of light and a casing around the same, said casing having an annular inclined flange in ILS rear portion, a reflector provided with an annular inclined-edge adapted to'mate,

withinsaid flange and having a groove within said edge, a gasket of elastic material carried Within said groove and adapted to support said reflector wit-11in said flange, and spring. clips attached to said casing, and pressing on said reflector to se-' cure thesame in place.

In testimony whereof, We, the said "lnoMAs- CLARENCE HEisEY and ANDREW J,

SANFORD have hereunto set-our hands.

THOMAS CLARENCE, HETSEY 3 ANDREW Witnesses CARL NonrnLL, RAY MARTiN, EDWARD YOUNG.

J. SANFORD, 3

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