US370993A - Incandescent electric lamp - Google Patents
Incandescent electric lamp Download PDFInfo
- Publication number
- US370993A US370993A US370993DA US370993A US 370993 A US370993 A US 370993A US 370993D A US370993D A US 370993DA US 370993 A US370993 A US 370993A
- Authority
- US
- United States
- Prior art keywords
- wires
- leading
- incandescent electric
- bridge
- electric lamp
- 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
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 20
- 229910052799 carbon Inorganic materials 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 229910052697 platinum Inorganic materials 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 210000001503 Joints Anatomy 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000006011 modification reaction Methods 0.000 description 4
- 206010022114 Injury Diseases 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002926 oxygen Chemical class 0.000 description 2
- 230000003068 static Effects 0.000 description 2
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/52—Means for obtaining or maintaining the desired pressure within the vessel
- H01K1/54—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering
Definitions
- the object of the invention is to provide efficient means for depriving the leading-in wires of incandescent electric lights from the occluded oxygen during the process of evacuating the globes.
- the invention consists, in general terms, in causing a strong electric current to pass. through the leading-in wires and across from one to the other by means of a temporary bridge, which, upon becoming heated by a sufiicient current, melts, and thus interrupts the connection between the two wires.
- This bridge is preferably formed of platinum, and
- nick or narrow portion at or near its center, which determines the point at which it will be fused. It may be carbon, if preferred.
- Figure 1 is a diagram of a lamp constructed to be treated in the manner contemplated by this invention, and Fig. 2 shows the completed lamp. Fig. 3 illustrates a modification.
- A represents the globe
- B the filament, of an incandescent lamp.
- the leading-in wires b and b are of the usual character; but they are connected with each other at or near the points where they unite with the carbon filament by a bridge-piece, O.
- this piece is of platinum. It'is constructed with a nick, c, at or near its center, for the purpose of increasing the resistance at that point.
- a current is passed through the two leading-in wires and across the bridge-piece of suflicient strength to heat the metal; but this current is not allowed to melt the bridgepiecc until the globe has been practically evacuated.
- a carbon bridge-piece, O is employed in place of the platinum piece.
- This operates in precisely the same manner. It may be constructed in any convenient manner-for instance, by electro-deposition. Thus a thin strip of carbon may be' connected across the leading-in wires, and the electric connection may be completed therewith by means of a narrow contact-plate which is submerged in a deposition-vat, which serves to enlarge the bridge-piece except at the point where the plate is applied, and to secure the ends in good electrical connection with the leading-in wires.
- the combination with the filament and the lead ing-in wires connected with the respective terminals thereof, of a bridgepiece connecting said leading-in wires, consisting of conducting material and having a nick or point of high resistance in its length.
- the filament, the leading-in wires, the joints-- between the two, and discharge-points extend-'- ing toward each other from said joints.
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- Vessels And Coating Films For Discharge Lamps (AREA)
Description
(No Model.)
B. P. THOMPSON.
INOANDESGENT ELECTRIC LAMP.
No. 370,993. Patented 0011.4, 1887.
"UNITED STATES PATENT OFFICE.
EDWARD P. THOMPSON, or ELTZABETIL'NEW JERSEY.
INCANDESCENT ELECTRlC LAMP.
SPECIFICATION forming part of Letters Patent No. 370,993. dated October 4, 1887. Application filed September 15, 1886. Serisl No. 218,572. (No model) To all whom it may concern:
Be it known that I, EDWARD I. THOMP- SON, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in the Method of Expelling Oxygen from the Leading-in Wires of Incandescent Electric Lights, of which the following is a specification.
The object of the invention is to provide efficient means for depriving the leading-in wires of incandescent electric lights from the occluded oxygen during the process of evacuating the globes.
The invention consists, in general terms, in causing a strong electric current to pass. through the leading-in wires and across from one to the other by means of a temporary bridge, which, upon becoming heated by a sufiicient current, melts, and thus interrupts the connection between the two wires. This bridge is preferably formed of platinum, and
has a nick or narrow portion at or near its center, which determines the point at which it will be fused. It may be carbon, if preferred.
In the accompanying drawings, Figure 1 is a diagram of a lamp constructed to be treated in the manner contemplated by this invention, and Fig. 2 shows the completed lamp. Fig. 3 illustrates a modification.
Referring to the figures, A represents the globe, and B the filament, of an incandescent lamp. The leading-in wires b and b are of the usual character; but they are connected with each other at or near the points where they unite with the carbon filament by a bridge-piece, O. In the instance shown in Fig. 1 this piece is of platinum. It'is constructed with a nick, c, at or near its center, for the purpose of increasing the resistance at that point. During the process of evacuating the lamp a current is passed through the two leading-in wires and across the bridge-piece of suflicient strength to heat the metal; but this current is not allowed to melt the bridgepiecc until the globe has been practically evacuated. Then it is gradually raised to such heat that all the remaining oxygen is driven off from the platinum, and as the process of evacuation continues this oxygen is withdrawn from the globe, and ultimately the current is increased, so that the bridge-piece C will fuse at the point a, whereupon the current will traverse the filamentB until the connection with the source is interrupted.
For the purpose of preventing the current from doing injury to the filament B it should be of low electro-motive force and greatquan- 'tity. After the globe has been sealed and the parts allowed to cool, the platinum will tend to take up whatever oxygen may have remained within the globe, thereby working advantageously.
In Fig. 3 a modification is shown wherein a carbon bridge-piece, O, is employed in place of the platinum piece. This operates in precisely the same manner. It may be constructed in any convenient manner-for instance, by electro-deposition. Thus a thin strip of carbon may be' connected across the leading-in wires, and the electric connection may be completed therewith by means of a narrow contact-plate which is submerged in a deposition-vat, which serves to enlarge the bridge-piece except at the point where the plate is applied, and to secure the ends in good electrical connection with the leading-in wires.
An advantage incident to this method of treating the lights is that the projecting ends of the bridge-piece which remain after it is fused serve in a measure to neutralize the static charge upon the opposing arms of the lamps or the opposite leading-in wires, thus reducing the tendency of the filament to throw off loose carbon and deposit it upon the inner surface of the globe. Another advantage is that it removes the necessity of employing the glass bridge-piece for steadying the parts while they are being inserted in the lamp.
I claim as my invention- 1. In an incandescent electric light, the combination, with the filament and the lead ing-in wires connected with the respective terminals thereof, of a bridgepiece connecting said leading-in wires, consisting of conducting material and having a nick or point of high resistance in its length. i
2. The combination, substantially as described, in an incandescent electric light, of
the filament, the leading-in wires, the joints-- between the two, and discharge-points extend-'- ing toward each other from said joints.
3. The combination, in an incandescent electric lamp, of the filament, the leading-in wires, 5 and discharge-points extending toward each other from the joints of the filamentwith the respective leading-in wires.
. In testimony-whereof I have hereunto sub scribed my name this 17th day of August, A.
. EDWARD P. THOMPSON. Witnesses: 1
DANL. W. EDGECOHB, CHARLES A. TERRY.
Publications (1)
Publication Number | Publication Date |
---|---|
US370993A true US370993A (en) | 1887-10-04 |
Family
ID=2440005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US370993D Expired - Lifetime US370993A (en) | Incandescent electric lamp |
Country Status (1)
Country | Link |
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US (1) | US370993A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2434478A (en) * | 1943-12-22 | 1948-01-13 | Westinghouse Electric Corp | Incandescent electric lamp and method |
US20060021253A1 (en) * | 2004-07-30 | 2006-02-02 | Pasternak Stephen M | Footwear outsole including star shapes |
-
0
- US US370993D patent/US370993A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2434478A (en) * | 1943-12-22 | 1948-01-13 | Westinghouse Electric Corp | Incandescent electric lamp and method |
US20060021253A1 (en) * | 2004-07-30 | 2006-02-02 | Pasternak Stephen M | Footwear outsole including star shapes |
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