US1620397A - Incandescent electrode device - Google Patents

Incandescent electrode device Download PDF

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Publication number
US1620397A
US1620397A US17062A US1706225A US1620397A US 1620397 A US1620397 A US 1620397A US 17062 A US17062 A US 17062A US 1706225 A US1706225 A US 1706225A US 1620397 A US1620397 A US 1620397A
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US
United States
Prior art keywords
electrodes
electrode
main
auxiliary electrode
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
Application number
US17062A
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English (en)
Inventor
Samson Curt
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General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
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Publication of US1620397A publication Critical patent/US1620397A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/541—Igniting arrangements, e.g. promoting ionisation for starting using a bimetal switch
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G01N33/04—Dairy products

Definitions

  • the present invention relates to the construction and operation of devices, such as electric lamps, in which an electric discharge is operated between electrodes heated to in- 5 candescence by the discharge.
  • the lamp shown in the drawing is of the type described broadly in Friedrich Patent 1,393,520 of October 11, 1921. It comprises in the main a sealed bulb 1, charged with an inert gas at substantial pressure, and provided with electrodes 2, 3, the former constituting the anode and the latter the cathode. These electrodes are attached to wire holders 4, 5, which are sealed into a glass stem 6 projecting into the lamp in the usual manner. The leading-in wires 7, 8, for these electrodes are sealed by fusion into the glass stem and carried to the members of a screw base 9.
  • the electrodes 2, 3, preferably consist of a highly refractory metal, such as tungsten or tantalum, and when the lamp is to be used for direct current operation, the anode preferably is made larger than the cathode.
  • anode holder 4 a bi-metal strip 10 which is adapted to change its shape when heated and thereby to separate the electrodes 2, 3.
  • a conductive support 11 of an auxiliary electrode 12 which preferably consists of tungsten mixed with thoria, or other material which will materially enhance the electron emissivity of the electrode.
  • auxiliary electrode 12 which preferably consists of tungsten mixed with thoria, or other material which will materially enhance the electron emissivity of the electrode.
  • the support 11 is another bi-metal expansion strip 13 which also is adapted to change its shape when heated but as shown in the drawing the strip 10 is located much more closely to a seriesconnected electric heater 14 than is the strip 13 and hence the heating of the strip 13 is somewhat delayed with respect to the strip 10, when the lamp is connected in circuit.
  • the resistor 14- becomes heated and causes the thermostatic device 10 to move the electrode 2 away from the electrode 3 until the holder 4- strikes the stop 15, the electrodes 12 and 3 remaining in contact.
  • An arc-like discharge is thereby formed between the anode 2 and the plate-shaped electrode 12 acting as cathode.
  • This discharge immediately heats the main cathode 3 to a high temperature.
  • the discharge which for sake of convenience may be designated as an are which it closely resembles, seeks the shortest path and therefore forsakes the oxidic electrode 12 and continues to operate between the main electrodes 2, 3.
  • the thermostatic strip 13 becomes heated and causes the electrode 12 to be moved away out of contact with the cathode 3.
  • the electrode 12' remains inactive during the normal operation of the lamp, thus avoiding vaporization of the inactive material from its mass by continued heating to a high temperature.
  • the holder for the auxiliary electrode 12 should be connected to the holder 5 of the cathode.
  • the holder 11 may be supported directly from the stem 6 but the auxiliary electrode should be conductively connected to the negative terminal of the lamp and preferably should be lightly held in contact with the cathode 3 by the holder 11 at the time the lamp is placed in operation.
  • An electric discharge device comprising main cooperating electrodes, an auxiliary electrode which is capable of more readily forming the seat of a discharge than one of said main electrodes, means for supporting said auxiliary electrode in electrical and thermal contact with one of said main electrodes, means for starting an are between said contacting electrodes and another main electrode and means for moving said auxiliar electrode away from the contacting electrode after the arc has been operating an appreciable interval, thereby rendering the auxiliary electrode inactive .while permitting the arc to continue operating between said main electrodes.
  • An electric lamp comprising the combination of a bulb, a charge of inert gas therein, main refractory electrodes in said bulb adapted to be heated to incandescence by a discharge in said gas between said electrodes, an auxiliary electrode containing material of higher electron emissivity than said main electrodes, means for initially startirzf an are between said auxiliary electrode and one of said main electrodes and thermo-responsive means for thereupon transferring said are to another of said main electrodes to the exclusion of said auxiliary electrode.
  • An electric discharge device comprising the combination of a container, a charge of gas therein, co-operating electrodes therein adapted tosustain an are, means for moving said electrodes in and out of contact, an
  • auxiliary oxidie electrode and means for causing said oxidic electrode to move into contact with one of said main electrodes when the device is non-operative and to separate therefrom when a discharge has started between said main electrodes.
  • An electric lamp comprising a sealed bulb, an inert gas therein, main electrodes consisting of highly refractory metal, an auxiliary electrode comprising a material of higher electron emissivity than said main electrodes, means for holding said auxiliary electrode in contact with one of said main electrodes when said lamp is unlighted, an electric resistance heater connect ed in series with said electrodes, tllCllllill-lQSPOllSlVG means in said lamp for separating-said main electrodes and a second thermal-responsive means arranged to function subsequent to said first meansto separate said auxiliary electrode from the main electrode originally in contact therewith.
  • An electric discharge device comprising cooperating main electrodes, an auxiliary electrode which is capable of more readily forming the seat of an electric discharge than said main electrodes, means for supporting said auxiliary electrode in such position with respect to said main electrodes that an arc therefrom to one of said main electrodes will activate the opposing elec trode and means responsive to said are for transferring the are from said auxiliary electrode to the activated electrode.
  • An electric discharge device comprising cooperating electrodes adapted to support an are, an auxiliary electrode, means for holding said auxiliary electrode in contact with one of said electrodes when said device is inactive, means for starting an electric discharge between said electrodes and a third electrode without separating said contacting electrodes and means for rendering said auxiliary electrode inactive after said discharge has started.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Discharge Lamp (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
US17062A 1949-07-09 1925-03-20 Incandescent electrode device Expired - Lifetime US1620397A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP48308A DE839421C (de) 1949-07-09 1949-07-09 Geraet zur Pruefung der Milch bei deren Annahme in der Molkerei

Publications (1)

Publication Number Publication Date
US1620397A true US1620397A (en) 1927-03-08

Family

ID=7382978

Family Applications (1)

Application Number Title Priority Date Filing Date
US17062A Expired - Lifetime US1620397A (en) 1949-07-09 1925-03-20 Incandescent electrode device

Country Status (4)

Country Link
US (1) US1620397A (enrdf_load_stackoverflow)
DE (1) DE839421C (enrdf_load_stackoverflow)
FR (1) FR25963E (enrdf_load_stackoverflow)
GB (1) GB235840A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB235840A (enrdf_load_stackoverflow) 1925-09-17
DE839421C (de) 1952-05-19
FR25963E (fr) 1923-07-18

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