US1601470A - Reflecting electric lamp - Google Patents

Description

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H H COLLINS REFLEGTING ELECTRIC LAMP Filed Sept. 15, 1922 Patented Sept. 28 1926'.

HAROLD H. COLLINS OF CINCINNATI, OHIO.

BEFLECTING ELECTRIC LAMP.

Application filed September 5, 1922. Serial No. 588,887. r

This invention relates to electric lamps of the filament type and has as one of its primary objects to provide a lamp of this type in whichllight rays which would ordinarily be projected toward the base of the lamp and be spent without any appreciable illuminating etl'cct, will be reflected in such a manner as to obtain the full benefit there from.

Generally speaking the invention contemplates'providing within the bulb of an electric lamp of the filament type. a reflector so positioned as to reflect those light rays emanating from the filament which would otherwise be projected toward the base of the lamp without any practical benefit, and it is another important object of the invention to provide the reflector with a reflecting surface of such contour as to obtain the best results.

Another important object of the invention is to provide a novel arrangement of the reflector and a novel means for supporting the same and the filament such as to properly relatively position these parts inthe most stable and substantial manner and to obtain the maximum benefit from the light rays emanating from the filament.

1n the accompanying drawings:

Figure 1 is a perspective view of an electric filament lamp constructed in accordance with the invention;

Figure 2 is a vertical axial sectional view therethrough taken substantially on the line 2 2 of Figure 1 looking in the direction indicated by the arrows.

The lamp embodying the invention comprises the usual bulb 1 having the attaching base 2 of any of the usual types and with the terminals of which base are connected the conductor wires or leads 3 which are associated with the stem of the lamp indicated in general by the numeral 4. As is usual, this stem is formed of glass and united in the usual manner to the base 2, and through: out the upper portion of its length it is tubular as indicated by the numeral 5 and houses the upper portions of the conductor wires or leads 3, these wires being suitably spaced by being passed through spaced perforations in a disc of insulating material 6 housed within the said tubular portion of the stem. The lower portion of the stem solid and indicated by thenumeral 7, and the wires 3 are led laterally in opposite directions through the wall of the tubular portion 5 of the stem immediately above the juncture of said portion with the upper'end of theportion 7, and are'thence led downwardly at opposite sides of thesaid portion 7 of the stem, being spaced and retained in place by a disc 8 of insulating material through which their upper portions are passed and which disc is mounted upon thesolid portion 7 of the stem 4:.

The reflect-or embodying the invention is indicated in general by thenumeral 9 and the same is supported at the lower end of thesolid portion 7 of the stem 4. Thereflector 9 comprises a body of substantially the form shown in the drawings and having the general shape of a partly hollow cone, the exterior surface of which constitutes the reflecting surface and is indicated by thenumeral 10. This surface has a substantially anticlastic conical contour, that is to say it is circumferentially convex and longitudinally concave. The reflecting surface may be provided in any of the customary ways and thereflector body 9 as a whole may be integrally connected with the said lower end of thestem 7 as for example, by being integrally molded if it, like the stem, is made of glass, the stem being in any event united to the body centrally of the depression in its base which renders it partly hollow, and being in axial alinement with said body. It will also be observed that thebody 9 is supported within the bulb with its base presented toward the attaching base 2 of the plug and with its apex, indicated by the numeral 11, presented toward the tip end of the bulb.

The wires 3 are led through the body, 9 of the reflector by being molded thereimt'or inserted through openings formed therein, as indicated by thenumeral 12, and are brought toward each other with their ends located as close to each other as is practical. The ends of theportions 12 of the conductor wires or leads 3 are electrically connected with the ends of an open annular filament 13. The filament 13, due to the close proximity of its ends, describes substantially a complete circle and the filament is supported in a plane at right angles to the axis of the stem 4 andreflector body 9 and surrounds the said body on a line substantially diagonally opposite the central circumferential line of thereflectin surface 10. A number ofwires 14 are-pro erably employed in supporting the filament 13, the said wires being the base of the anchored at their lower ends to the filament at suitable intervals as at 15 and being extended upwardly past and united to or embedded in the edge or peripheral portion ofreflector body 9 and above said base being directed inwardly at an angle as at 16 and embedded in or united to thesolid portion 7 of the stem 4.

From the foregoing description of the invention it will be evident that those rays emanating from the filament 13 and which would ordinarily be projected upwardly and inwardly or in a more or less upward direction, will not'be expended without benefit inasmuch as they will be reflected back from thesurface 10 of the reflector and projected with the other rays emanating from the said filament. It will also be evident that inasmuch as the gap between the ends of the filament is not of appreciable width or at least is no greater than is practical, there will be no presence of a dark side when the lamp is energized and in fact the filament'may be considered as extending continuously about the reflector body.

Having thus described the invention, what is claimed as new is:

1. In an electric lamp, in combination, a bulb having an attaching base, a stem leading from said base within the bulb, a reflector body of a conical form positioned within the bulb and united to the end of the supporting stem in a concentric position and with its base presented toward the,

said attaching base of the bulb and its apex presented toward the tip end of the bulb, conductor wires associated with the stem and extending through the said reflector body and beyond the outer surface thereof with their ends located in relatively close proximity, an open annular filament electrically connected at its ends with the said ends of the conductor wires to receive current therefrom, the said filament surrounding the reflector body in a plane above the apex thereof, and supporting wires radiating from the stem above the reflector body and extendin downwardly past the periphery thereof and united thereto and at their lower ends united to and supporting the said filament.

2. In an electric lamp, in combination, a bulb having an attaching base, a stem leadstem above the reflector ing from said base within the bulb, a reflector body of a conical form positioned within the bulb andunited to the end of the supporting stem in a concentric position and with its base presented toward the said attaching base of the bulb and its apex presented toward the tip end of the bulb, conductoriwires associated. with the stem and extending'through the said reflector body and beyond the outer surface thereof with their ends located in relatively close proximity, an open annular filament electrically connected at its ends with the said ends of the conductor wires to receive current there from, the said filament surrounding the reflector body, and supporting wires radiating from the stem above the reflector body and extending downwardly past the periphery thereof and united thereto and at their lower ends united to and supporting the said filament, the reflector body having a reflecting surface of anticlastic conical contour.

3. An electric lamp comprising a bulb having an attaching base, a stem of glass anchored to the base and extending within the bulb longitudinally thereof, a disc supported byand surrounding said stem and of insulating material, a reflector body of conical form supported at the end of the said stem, the said reflector body having a reflecting surface of anticlastic conical contour, supportingcwires radiating from the body and having portions extending downwardly about and past the periphery of the said body in contact therewith whereby to brace the said wires against vibration, an open annular filament supported by the lower ends of the said supporting wires in position surrounding the reflecting surface of the reflector body, the ends of the filament being located relatively close together and the filament being located above the lower end or apex of the reflector body, and conductor wires led downwardly through the said stem, outwardly therefrom in opposite directions and through the insulating disc, the wires being led through the wall of the reflector body and electrically connected with the ends of the filament.

In testimony whereof I aflix my signature.

HAROLDH. COLLINS. [L. s]

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