US2438684A - Electric lamp - Google Patents

Description

March 30, 1948. G. c. SINGER ELECTRIC LAMP Filed June 16, 1945 Hume/MAW fi m/er 61 $929 5 h L [MW/Qua I Patented Mar. 30, 1948 UNITED. STATES PATENT OFFICE ELECTRIC LAMP Grover 0. Singer, Brownsville, Tex.

Application June 16, 1945, Serial No. 599,785 2 Clams. (Cl. 24(l-4L5) This invention relates to electric lamps and is directed more particularly to a metal ring which is engaged around the bulb or envelope of the lamp.

An object of my present invention is the provision of a metal rim for engagement around the bulb of an electric lamp for securing the lamp in position in'a holder or adaptor employed for mounting the so called sealed beam headlights for use on automobiles.

Another object of the invention is the pro-' vision of an electric lamp in which the top and adjacent portions of the side walls of the bulb have corrugations, a, metal rim having the inner surface highly polished and formed to fit over the corrugations and a portion of the top for not only acting as a reflector but providing means for actuating the lamp in position.

A furtherobject of the invention is the pro-' vision of an electric lamp having means thereon for attaching said lamp in a holder, said means being in the form of a split steel ring having the inner surface highly polished to form a reflector for light rays when applied to the bulb, the inner face of the side wall of the bulb being provided with reflecting materials, said steel ring having an annular flange engaging over the outer face of the top of the bulb and cooperating with the reflecting materials on the inner face ofthe side wall for diverting light back into the bulb.

This invention will be best understood from a consideration of thefollowing detailed description, in the accompanying drawings forming a part of the specification; nevertheless, it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications as define no material departure from the salient features of the invention as expressed in the appended claims. In the drawings:

Fig. 1 is a view in elevation of an electric lamp showing the greater portion of the bulb in section.

Fig. 2 is a vertical section of a modified form of the bulb illustrated in Fig. 1.

Fig. 3 is a side view in elevation of the lamp shown in Fig. 2, and

Fig. 4 is a fragmentary top plan View of the lamp shown in Figs. 2 and 3.

Referring more particularly to Fig. 1, l designates a globe having an integrally formed base or neck II and a top l2.

The base has an axial passage l3 into which is fitted a plug I. This plug is sealed hermetically to the. walls of the passage by any well-known v 2 form of cement l5 suitable for the purpose. This cement is placed in grooves which may be semicircular in cross section. The base II has one groove is while the plug M has the other or matching groove I1. I

The plug carries lead-in wires 20, 2|, 22 and a fourth lead-in wire not shown. Each leadin wire is in contact with a prong 24. A pair of the lead-in wires carries the filament 25 while a second pair carries the filament 26. Pairs of the prongs 24 are intended to be connected with the terminals of the usual electric circuit.

A passage 21 provides means for exhausting air from the envelope I 0 and is sealed hermetically as indicated at 28.

Reflecting materials 30 are applied to the inner face of the side Wall of the bulb and terminate in a horizontal plane indicated by the line M.

A centrally disposed reflector 32 is applied to the inner face of the top l2. This reflector not only directs the central light rays inwardly of the bulb but prevents blinding rays emanating from the lamp.

A particular form of ring, generally designated by the numeral 35 is clamped to the periphery of the bulb where the side wall merges into the top. This ring is formed of steel and has its inner face highly polished.

The ring has a flange 36 which closely fits the smooth portion 37 of the top. The remaining portion of said top is corrugated as shown at 38 to disperse the light rays. Said ring has a thick portion 39 provided with spaced vertical passages 40 through which bolts may be passed for connecting the lamp to a holder.

The bottom portion of the ring has a. plurality of corrugations M which fit over corrugations 42 formed on the outer side wall of the globe.

The ring is split as shown at 43. A pair of ears 44 project laterally from the ring and a bolt 45 is threaded into perforations in the ears for drawing the ring up taut, around the globe.

Tongues 46 extend downwardly from the ring and have passages 41 for providing additional fastening means for the bulk when placed in a holder.

In Figs. 2 and 3 inclusive is illustrat d another form of ring and lamp although the plug is omit- In this modification the ring has an annular the top 51 of the globe as. A second flange 59 is located below the thickened annular portion 66 of the ring. The thickened portion has spaced vertical passages 6! which are adapted to receive threaded bolts for fastening the lamp in position in a holder.

Tongues 62 depend from the annular flange 59 in spaced relation and have passages 63 to receive hooks or other fastening means for aiding further in securing the lamp in position.

The ring is split as shown at 65 and the split ends are drawn together by a bolt 68 threaded into perforations ,in ears '61 secured to the free ends of the ring.

The entire inner surface of the ring including the flanges 56 and 59 is highly polished to act not only as a reflector but as a means for cutting off the outward passage of light rays adjacent the periphery of the top 51. Light rays are directed inwardly by the ring 55 and in cooperation with the corru ated reflector III at the inner surface of the top, blinding rays from the lamp are eliminated at the central portion of the lamp.

The inner surface of theside wall of the bulb 58 may be coated withreflecting materials as indicated at 30 in Fig. 1 and the reflecting materials are extended downwardly on said surface from the dotted line I I. 7

Embedded in the hollow base 50 are a series of lead-in wires 12 and I3 and it will be understood that filaments (not shown) are connected to pairs of the inner free ends of said wires in,the same manner as shown in Fig. l.

The rings 35 or 55 are manufactured in difierent sizes to accommodate lamps of various dimensions.

However, a split ring of a predetermined diameter can be applied to lamps of slightly varying circumferences because the threaded bolts 55 and 66 will draw the free ends of the rin s close together.

The corrugated portion of the top 51 of the envelope is only a partial reflector because the light rays from the filaments must pass through this portion for illumination. However, due to the corrugations ill, the light rays passing 7 through the top of the bulb are softened so that blinding rays are eliminated.

The rings 35 and 55 are made of metal and fit around the more fragile portions of the bulb,

namely where the side wall Joins the top and serves to protect the envelope in the areas where it is more likely to be contacted by other obiects. It will, therefore, be seen that the ring is disposed in protective relation with the more fragile parts of the globe while it also provides means for attaching the lamp in operative position. As has been stated the ring serves the further function of acting as an internalreflector.

I claim: 1 1. In an electric lamp including a globe, a protector attached to that portion of the globe where the side wall of said globe is connected to the top thereof, said protector comprising a relatively thick ring and thin flanges extending in opposite directions from the ring, one flange engaging over a portion of the top, the other flange engaging over a portion ofthe side wall, said ring and flanges being formed of metal, the side wall of the globe within the confine of the second flange being corrugated, said flange having complementary corrugations fitting over the corrugated portion of the side wall.

.2. In an electric lamp including a globe, a mounting protector therefor applied to the outer edge of said globe where the side wall meets the top, said protector comprising a. ring having flanges extending in different directions, one being an inwardly curved annular flange extending from the inner periphery of the ring and em- I bracing a portion of the top of the globe, the other flange extending rearwardly from the ring and embracing a portion of the side wall of said REFERENCES CITED The followingreferences are of record in the file of this patent:

UNITED STATES PATENTS Name Date Taylor et a1 Nov. 29, 1938 Taylor etal Nov. 29, 1938 Number Portno'w .4. Mar. 23, 1943

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