US1014686A

US1014686A - Incandescent lamp.

Info

Publication number: US1014686A
Application number: US56501810A
Authority: US
Inventors: John Wilson
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-06-04
Filing date: 1910-06-04
Publication date: 1912-01-16
Anticipated expiration: 1929-01-16

Description

J. WILSON.

INCANDESGENT LAMP.

APPLICATION FILED JUNE 4, 191( Patented J an. 16, 1912.

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v INGANDESGENT LAMP. APPLICATION TILED mm 4, 1910.

1 014 686 Patented Jan. 16, 1912.

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- Specification of Letters Patent.

- Patented Jan. 16,1912.

To all whom it may concern: I Be it known that I, JOHN WILSON, residing at Victoria, in the Province of BIItiSll Columbia and Dominion of Canada, have invented certain new and useful Improvements in Incandescent Lamps, of which the following is a specification.

This .mvention relates to incandescent electric lamps, and more particularly to tortuous filament lamps, such as are usually made with tungsten or tantalum filaments, and has for its object to provide a lamp having an interior reflector arranged to reflect the light rays emanating from the filament and thus magnify-the brilliancy of the light.

Another and particular object is to provide a lamp of this character in which the reflecting element performs not only its function as a reflector, but also acts as the insulating supporting stock for the filaments.

Another object is to provide a structure in which the ends of the several lengths of the filament will be supported, without communicating with the reflecting material within the stock.

In the drawings forming a portion of this application, and in which like numerals of re erence indicate similar parts ofthe several views,Figure 1 is an elevational view of a lamp constructed in accordance with the present invention. Figure 2 is a transverse section on line 22 of Fig. 1. Fig. 3. is a longitudinal section on line 3-3 of Fig. 1. Fig. 4 is a detailed perspective view of the stock and the filamentattached thereto. Fig. 5is a detailed view of the su porting spider in elevation, removed from the stock. Fig. 6 is a view showing a modified form of filament and mountin therefor. Fig. 7 is a fragmentary sectiona view of the lower end of the stock.

Referring now to the drawings, there is shown an electric lamp includmg an attachin plug 5 to which there is attached the usual ulb 6. Within the bulb, there is a centrally located longitudinally extending hollow glass supporting stock which is poth lygonal in cross section and which, at its inner end, is connected with the inner extremities of the side walls of the bulb. This stock is transparent, and is interiorly coated with mercury or other reflecting material indicated at 8, the stock itself being indicated at 7, as shown. The reflecting metal terminates short of the inner end of the stock, as

illustrated, and formed in the outer surface of the stock, there are a pair of circumscribing grooves 9..and 10 respectively, the

former being located adjacent to the outer end of the stock, while the latter is located approximately at the inner end of the coating of reflecting material. Engaged in each of these grooves, there is afilament supg s ider 11, consisting of a continuous piece of insulated wire bent upon itself at spaced points to form radially projecting arms-12. The arms of one of these s iders are located each at the angle. formed y the union of two of the faces of the stock, while the arms of the opposite spider are located each midway between the edges of one of the faces of the stock, so that the arms of the two spiders are disposed in alternate relation. The connecting portions which extend between the arms 12 lie in the grooves 9 and 10, and the two portions A and B of the arms are twisted together as indicated at 14,110 hold the connecting portion, firmly in the slot.

Engaged tortuously with the outer ends of the arms there is a continuous filament C which has its ends carried to the inner end of the stock, where they are attached to two outwardly extending feed wires 15 and 16, which are engaged through the side of the stock inwardly of the metallic reflecting coating. One of these wires 15 is carried to the surface of the attaching plug 5, while the other is carried through a central contact member 18, as indicated. It will thus be seen that a structure is produced in which the supporting stock performs the double function of holding the two spiders in spaced relation, and of forming a reflector within the inclosure of the filament.

reason of the fact that the arms of one B oi the spiders are located at the angles of v the faces of the stock, and the arms'of the other e several lengths 17 of the filament ,0 do not extend across the angles of the faces of'thestock, but lie each opposite to one of e faces, so that a maximum of illuminat 1on is assured. By reason of the fact that the supporting spiders are enga ed in grooves of the outer faces of the stoc there is no danger of contact between,these spiders and the -metallic reflecting coating within the stock, as. would be the case'were the 1zpiders embedded in the glass of the stoc I I 7 wire Y passes centrally through the stock,

electriclamp;comprisingasupporting In the modified form of the inflention shown in Fig. 6, the stock. is provided with a Web X at its outer end, through'wlii'ch there is passed a central feed wire Y,,form-- ing one connection for the filament; which is married helically around the .stock throughout the length thereof where"it' connected with the opposite feed wirei In thisform of the invention, the stock still rforms the doublefunction of. holding the ament in proper position, while acting as a reflecton By reason of the fact that the there is of course no danger of its. contact with the metallic reflecting coating. The helical'filament is indicated atW. f l -What is claimed is:

' Witnesses 5 wound'on the arms, the disposition ofthe 25 'armsbeing' such that the various conv'oluti oils of the filament will lie across the flat reflecting faces to secure a maximum amount of reflection from the said faces.

Intestimony whereof I aflix my signa- 'ture; innpresence of two witnesses. v v

I i JOHN WILSON.

MAfUBICECA Nl DOUGLAS B. MCCORMAN.

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