US411018A - Manufacture of incandescent electric lamps - Google Patents
Manufacture of incandescent electric lamps Download PDFInfo
- Publication number
- US411018A US411018A US411018DA US411018A US 411018 A US411018 A US 411018A US 411018D A US411018D A US 411018DA US 411018 A US411018 A US 411018A
- Authority
- US
- United States
- Prior art keywords
- electric lamps
- incandescent electric
- manufacture
- lamp
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 8
- 238000010438 heat treatment Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 18
- 239000007789 gas Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- DLYUQMMRRRQYAE-UHFFFAOYSA-N Phosphorus pentoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 101700065656 FAM3C Proteins 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000003292 diminished Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/38—Exhausting, degassing, filling, or cleaning vessels
Definitions
- the object of my invention is to simplify the process of exhausting the globes of incandescent electric lamps and to do away with danger of injur Y to the filament, which has sometimes occurred in the process heretofore followed.
- My invention consists in heating the globe from an external source during the process of exhaustion. This heating may be accomplished in various ways. A convenient apparatus for the purpose is shown in the aecompanying drawing.
- A is a Sprengel vacuum-pump, to which the incandescent electric lamp Bis attached in the usual manner.
- C is a receptacle containing phosphoric anhydride or other absorbent of moisture.
- D is a heating-lamp burning oil or alcohol.
- a metal tube or chamberE extends, which surrounds the electric lamp B, such tube having a hole for the exhausttube of the lamp.
- the heat from the flame passes up around the electric-lamp globe, and such globe is thereby heated until the adhering gases and vapors are driven 01f from the glass and are withdrawn through the pump or absorbed by the substance in bulb (J.
- Vhat I claim is 1. Theherein-described process of manufacturing incandescent electric lamps, consisting in externally heating the lamp-globe during the process of exhaustion.
Description
(No Model.)
T. A. EDISON. MANUFACTURE OF INOANDESGENT ELECTRIC LAMPS. No 411,018. Patented Sept. 17, 1889.
UNITED STATES PATENT OFFICE.
THOMAS A. EDISON, OF LLEWELLYN PARK, NEW JERSEY.
MANUFACTURE OF INCANDESCENT ELECTRIC LAMPS.
SPECIFICATION forming part of Letters Patent No. 411,018, dated September 17, 1889. Application filed July 17, 1886. Serial No. 208 242. (No model.)
T 0 aZZ whom it may concern.-
Be it known that I, THOMAS A. EDISON, of Llewellyn Park, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Processes of Manufacturin g Incandescent Electric Lamps, (Case No. 666,) of which the following is a specification. The object of my invention is to simplify the process of exhausting the globes of incandescent electric lamps and to do away with danger of injur Y to the filament, which has sometimes occurred in the process heretofore followed.
Ilei'etofol'e the lamp to be exhausted has been placed in connection with a Sprengel vacuum-pump, and during the operation of such pump the carbon filament has been heated to high incandescence by the passage of an electric current, the object of such heating being to expel from the carbon certain gases and vapors which were supposed to be occluded or contained in the pores of the carbon, such gases and vapors being then withdrawn by the pump. I have discovered that the amount of gases and vapors contained in the pores of the filament is so small as to be of practically no consequence in impairing the vacuum within the globe, and that the gases and Vapors which were drawn off from the lamp by the heating of the filament came not from the filament, but in fact from the inner surface of the globe, to the glass of which they adhered until drawn off by heat. It was thus necessary to bring the filament up to a very high incandescencehigher than that at which it was intended to be usedin order to sufficiently heat the glass to driveoff the adhering fluids. This high incandescence was of course in some cases dangerous to the filament, and also diminished the life of the lamp in use. By my invention I do away with this heating of the filament, 4 and so avoid these dangers, and also do away with the expense and inconvenience of providing the power required to produce the current necessary for such heating.
My invention consists in heating the globe from an external source during the process of exhaustion. This heating may be accomplished in various ways. A convenient apparatus for the purpose is shown in the aecompanying drawing.
A is a Sprengel vacuum-pump, to which the incandescent electric lamp Bis attached in the usual manner.
C is a receptacle containing phosphoric anhydride or other absorbent of moisture.
D is a heating-lamp burning oil or alcohol. From its chimney a metal tube or chamberE extends, which surrounds the electric lamp B, such tube having a hole for the exhausttube of the lamp. Through this tube the heat from the flame passes up around the electric-lamp globe, and such globe is thereby heated until the adhering gases and vapors are driven 01f from the glass and are withdrawn through the pump or absorbed by the substance in bulb (J.
After the lamp is exhausted it is sealed off at a, and is then ready for use.
Vhat I claim is 1. Theherein-described process of manufacturing incandescent electric lamps, consisting in externally heating the lamp-globe during the process of exhaustion.
2. The herein-described process of manufacturing incandescent electric lamps, consisting in exhausting the globe bya Sprengel vacuum-pump and at the same time heating such globe externally.
3. The herein-described process of manufacturing incandescent electric lamps, consisting in heating the lam p-globe by a current of heated air or gas during the process of exhaustion.
This specification signed. and witnessed this 15th day of July, 1886.
THOS. A. EDISON.
Witnesses:
WM. PELZER, A. W. KIDDLE.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US411018A true US411018A (en) | 1889-09-17 |
Family
ID=2479952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US411018D Expired - Lifetime US411018A (en) | Manufacture of incandescent electric lamps |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US411018A (en) |
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0
- US US411018D patent/US411018A/en not_active Expired - Lifetime
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