US470925A

US470925A - Manufacture of filaments for incandescent electric lamps

Info

Publication number: US470925A
Authority: US
Publication date: 1892-03-15
Anticipated expiration: 1909-03-15

Description

(No Model.)

T. A. EDISON. MANUFACTURE OPPILAMBNTS FOR INOANDESGBNT BLEGTRIO LAMPS.- vN0. 470,925 Patented'Mar. 15, 1892.

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THOMAS A. EDISON, OF LLEWELLYN PARK, NEW JERSEY.

MANUFACTURE OF FILAMENTS FOR lNCANDlZSCENT EL ECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 470,925, dated March 15, 1892.

Original application filed March 20, 1880, Serial No. 5,864. Divided and this application filed July 2, 1888. Serial No. 278,852.

(No model.) Patented in England September 16, 1880, No. 8,765 in Italy November 6, 1880, No. 12,315 in Canada November 11,1880,No.11,968; in Belgium November 15, 1880, No. 52,890; in Victoria December 18, 1880, No. 2,936; in Austria-Hungary January 7, 1881; in Queensland February 7, 1881 in New Zealand March 7, 1881 No- 510 in Portugal March 31, 1881, No. 661; in New South Wales April 2, 1881; in Spain April 26,1881, No. 1,284, and in France June 10,1881,No.

To all whom it may concern:

Be it known that I, THOMAS A. EDISON, a citizen of the United States, residing at Llewellyn Park, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Carbons for Electric Lamps and the Manufacture Thereof, (Case No. 780, division of Case No. 210,) of which the following is a specification, and which has been patented as follows: in Great Britain, No. 3,765, dated September 16, 1880; in Italy, No. 12,315, dated November 6, 1880; in Canada, No. 11,968, dated November 11, 1880; in Belgium, No. 52,890, dated November 15,1880; in Victoria, No. 2,936, dated December 13, 1880; in Austria-Hungary, T 31, f. 50, dated January 7, 1881; in Queensland, February '7, 1881; in New Zealand, No. 510, dated March 7, 1881; in Portugal, No, 661, dated March 31, 1881; in New South WVales, dated April 2, 1881; in Spain, No. 1,284, dated April 26, 1881, and in'France, No. 111,976, dated June 10, 1881.

As before explained in prior applications for patents for inventions of mine relating to lighting by electricity, it is essential that the incandescing conductor should be of high resistance and that great advantages result from the increase of resistance when such increase can be obtained without increase in the extent of the radiating surface. I have discovered that an incandescing conductor of very high resistance in comparison with the radiating surface may be made by taking several exceedingly-fine fibers or filaments of carbonizablematerial and welding them together prior to carbonization by a suitable cementing carbonizable liquid. For this purpose I prefer to use natural fiberssuc'h as bast, jute, manila, hemp, &c.-or other fibers of endogenous growth made up of a great number of parallel elementaryfibers cemented together by a natural cementing material, which on carbonization locks all the elementary fibers together into a homogeneous filament. I take several of these natural fibers,

and after removing the extraneous matter by passing them through a cutting-die I form them into a bunch and dip them together into a solution of sugar or other carbonizable liquid and then carbonize them as one fiber, the

carbonizable cementing-liquid binding them firmly together into a homogeneous filament of high resistance and moderate radiating surface.

The filament and the method of making it is shown in the accompanying drawing.

A is a suitable receptacle containing the carbonizable liquid B. The receptacle is open at its top. One of its sides is provided with a small hole a. A number of fine filaments b are taken and their ends passed through the hole a from within the box. The filaments are then drawn through the carbonizable liquid, and are thus welded into a compact integral filament c, which may be carbonized in any suitable manner.

In my application, (Case No. 210,) Serial No. 5,864, filed March 20, 1880, is described the use of natural fibers for forming on carbonization the incandescing filaments of electric lamps. This application, which is of the division of my prior application, (Case No. 210,) relates to an improvement upon the invention described in that application.

What I claim as my invention is l. A filament for forming the carbon incandescing conductor of an electric lamp, consisting ofa number of line filaments welded together by a carbonizable cementing substance, substantially as set forth.

2. A filament for forming the carbon incandescing conductor of an electric lamp, consisting of a number of natural fibers welded together by a carbonizable cementing substance, substantially as set forth.

3. The method of manufacturing incandescing conductors for electric lamps, consisting in uniting by a carbonizable cementing substance a number of carbonizable filaments and then carbonizing the whole, substantially as set forth.

4. The method of manufacturing incandes- This specification signed and witnessed this cing conductors for electric lamps, consisting 21st day of June, 1888. in takin natural fibers removin therefrom r 7 the extrgneous matter, ilniting a number of HIOS' EDISON 5 such fibers by a carbonizable cementing sub- Vitnesses:

stance, and then carbonizing them as one fila- \VILLIAM PELZER, ment, substantially as set forth. A. W. KIDDLE.