US2398970A - Electric lamp - Google Patents

Description

April 23, 1946. G. c. SINGER ELECTRIC LAMP Filed May 1,- 1945 Elma/WM Patented Apr. 23, 1946orric'a 1 nnnc'ralo LAMP Grover 0. Singer, Brownsville, Tex. Application May' 1, 1945, Serial No. 591,375

- This invention relates to electric lamps.

An object of the invention is the provision of an electric lamp in which the bulb is formed of transparent materials with .reflective materials applied to the inner surface of the walls of the globe and with a ring of reflective materials applied to the outer face of the outer end of the globe leaving a space within the inner periphery of the ring free to transmit light except for a central reflector located directly over the usual filaments in the globe.

A further object of the invention is the provision of an electric lamp having reflective materials on the inner surface of the usual transparent globe with a ring of reflective materials on the outer end of the globe, a reflector being located centrall at the innerface of the outer end of the globe, said reflector being applied directly to the inner face or attached thereto.

This invention will be best understood from a consideration of the following detailed description, in the accompanying drawing 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 drawing: Fig. 1 is a vertical section of one form of an electric lamp constructed according to the principles of my invention;

'9 Claims. (oi. 176-34) plied to the outer surface of the. end portion l2 of the bulb, leaving a portion Iloi the transparent cover free to transmit light rays.

A. transparent cup-shaped member- 2|... is secured to the inner face of the cover'll'by a in 2|, This pin passes through an opening in the cover I: and also extends through the inner end of themember 20. The ends of the Pl ins shown at 22 and 23, are split and bent outwardly for retaining the cup-shaped member in place. This cup-shaped member has its inner surface covered with reflective materials. l

The base member is provided with a plurality ofprongs 25, 26, 21 anda fourth prong is shown at 21c at the front ofprong 21 in Figs, 2- to' 5, inclusive. The prongs are extensions of strips ofmaterial 28, 20, 30 and 3|. The strip 'ofmaterial 30 is shown in dotted lines, while a portion of the strip ll is shownabove a portion of thestrip 30. All of the strips are located between the inner wall of apassage 36 and a plug which is cemented in said passage formed in the base IE.

It will be noted that the base III is provided with asemi-circular groove 31 which faces asemi-circular groove 38 in theplug 35, so that when the plug is being positioned cement may be filled 3 into the circular channelformed by the grooves Fig. 2 is a view in elevation of a modified form v of the electric lamp and partly in section:

Fig. 3 is a view in elevation partly in section of a further modified form of an electric lamp;

Fi 4 is a view in elevation partly in section of a still further modified form of the invention;

Fig. 5 is a view in elevation partly in section.

of another form of the electric lamp.

Fig. 6 is a fragmentary view in section of a lamp showing a modified form of the central reflector illustrated in Fig. 2. a

Referring more particularly to the drawing, l0 designates a base member formed of. glass while I! designates a globe likewise formed of glass and integrally with the base member. The outer end of the globe as shown at it is curved outwardly.

The inner surface of the globe is covered with reflective materials shown at i 5 and these reiiec. tive materials cover the inner end of the base as 31 and 38 for'securing the strips 2|, #9; I0 and Si inposition.

There are four lead-in wiresindicated by the numerals 4| and 42-. These lead-in wires extend into the bulb I! and filaments 42} and are thereto while another lead-in wire will be connected to the negative side of the current In assembling the lamp the cup-shaped member 20 is inserted through the passage 33 in the and extend over theside walls of the bulb H and,

base member In before theplug 35 is sealeddn place and thesplit ends 23 of the pin 2! are bent over the outer 'end of said cup-shaped member. By this construction the hollow pin 2! may be employed for. removing the air from the bulb I I and then the passage Bil in the pin may be sealed as shown at El, or a passage may be formed in theplug 35 and the air exhausted through said passage.

It will be noted that thereflective materials are spaced from the lead-in wires in order to prevent a short circuit.

Referring more particularly to Fig. 2, it will be seen that a modified form-of the lamp is provided and since all of the elements are substantially the same as that shown in Fig. 1 except thereflector 55, the same reference numerals wlll be employed for identical parts.

Thereflector 55 consists of a concave disk of transparent materials which hasreflective materials 56 located between the outer end It of the bulb II and thedisk 55. This disk is held in place by a pin similar to a cotter pin as shown at 51. The prongs of the pin pass through openings in the outer end l2 of the globe through globe, the outer end of the globe having a ring thereflective materials 56 and thedisk 55. The

inner ends 58 of the pin are bent over the outer face of the disk. This dish is small enough to be inserted through thepassage 36 in the base member Iii. Aplug 35 is identical in construction with that shown in Fig. l.

Since Figs. 3, 4 and 5 are identical in construction with Figs. 1 and 2 except the central reflector on the outer end I20! the lamp, only the reflectors will therefore be described.

In'Fig. 3 reflective materials 60 are applied to the inner surface of the central reflector, the inher surface 6! of globe ll being clear glass.

In Fig. 4 the central portion of the outer end [2 is indented to form a convexcentral portion 62.Reflective materials 63 are applied to the inner convex surface of themember 62.

In Fig. 5 the central portion of the cover or outer end of the globe i I is bent outwardly to form a concaveinner surface 65 and this concave inner surface hasreflective materials 66 thereon.

If desired, any of themembers 20, 55, 62 or 65 may be formed of colored glass in order to vary the eifect of the light which is reflected to the reflective material on the side walls of the globe H, and then reflected forwardly.

'.In Fig. 6 is shown a modified form of the central reflector which consist of a concave mirror composed of atransparent member 10 formed of colored glass. The rear portion of themember 10 is coated with reflective materials TI.

The reflector is held in place by a pin having a.head portion 12 with legs 13 extending through openings in the outer end 14 of aglobe 15. The legs of the pin extend through openings in themembers 10 and H and are bent outwardly as shown at 16 against the inner convex face of the member ID. This pin is preferably sealed in place to prevent the ingress of air to the globe".

The central reflectors not only prevent the light rays from forming a spot light, but provide a flood light of the rays passing through the outer end of the globe between the central reflector and the ring of reflective materials l'l.

The ring ll of reflective materials in Fig, 3 is applied to the inner surfaceof the outer end of the globe and may be so applied in the other constructions.

Iclaim:

1. An electric lamp comprising a transparent globe, a base connected to said globe, reflective materials applied to the inner surface walls of the globe, the outer end of the globe having a ring of reflective materials applied to the outer face adjacent the periphery thereof, lead-in wires embedded in the base, filaments connected to the inner ends of the lead-in wires, and a reflector located at the central portion of the outer end of the globe.

2. An electric lamp comprising a transparent globe, a base connected to said globe, reflective of reflective materials applied to the outer face adjacent the periphery'thereof, lead-in wires embedded in the base, and filaments connected to the inner ends of the lead-in wires, the outer end ot-the globe being provided with a substantially convex reflector.

4. An electric lamp comprising a transparent globe, a base connected to said globe, reflective materials applied to the inner surface walls of the globe, the outer end of the globe having a ring of reflective materials applied to the outer face adjacent the periphery thereof, lead-in wires embedded in the base, filaments connected to the -inner ends of the lead-in wires, the outer end of the globe being provided with a substantially convex reflector, and means for securing the reflector to the inner face of the outer end of the globe.

5. An electric lamp comprising a transparent globe, a base connected to said globe, reflective materials applied to the inner surface walls of the globe, the outer end of the globe having a ring of reflective materials applied to the outer 9 'materials applied to the inner surface walls of the globe, the outer end of the globe having a ring of reflective materials applied to the outer face adjacent the periphery thereof, lead-in wires embedded in the bwe, filaments connected to the inner ends of the lead-in wires, a reflector located at the central portion of the outer end of the globe, and means for securing the reflector to the inner face of the outer end of the globe.

'7. An electric lamp comprising a. transparent globe, a base connected to said globe, reflective materials applied to the inner surface walls of the globe, the outer end of the globe having a ring of reflective materials applied to the outer face adjacent the periphery thereof, lead-in wires embedded in the base, filaments connected to the inner ends of the lead-in wires, and a concave reflector formed in the outer end of the globe and disposed centrally of said outer end.

8. In an electric lamp having filaments therein,

I a globe formed of transparent materials, the

inner face of the side walls of the globe being covered with reflective materials, the outer end of the globe having a circular band of reflective materials applied to the outer surface thereof clear-space at said end for the transmission of light rays, the central reflectors being colored for reflecting colored light rays on to the reflective materials on the side walls of the globe, said colored rays from the central reflectors and light rays directly from the filaments being combined and reflected from the side wall reflector through the clear space to provide a soft non-blinding light.

GROVER C. SINGER.

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