US2049338A - Electric incandescent lamp - Google Patents

Electric incandescent lamp Download PDF

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Publication number
US2049338A
US2049338A US10723A US1072335A US2049338A US 2049338 A US2049338 A US 2049338A US 10723 A US10723 A US 10723A US 1072335 A US1072335 A US 1072335A US 2049338 A US2049338 A US 2049338A
Authority
US
United States
Prior art keywords
filament
fuse
switch arm
lamp
incandescent 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
US10723A
Other languages
English (en)
Inventor
Trope Carl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2049338A publication Critical patent/US2049338A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K9/00—Lamps having two or more incandescent bodies separately heated
    • H01K9/02—Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies
    • H01K9/06—Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies with built-in device, e.g. switch, for automatically completing circuit of reserve body

Definitions

  • My invention relates to electric incandescent lamps and particularly to multiple filament lamps. Still more particularly my invention relates to incandescent lamps comprising two or more filaments, one of which is normally operative, and means for automatically bringing into the electrical circuit another filament when the normally operative filament burns out.
  • the present invention is based on the fact that when a filament burns out, the current rises as the windings of a coiled filament come in contact or as a small arc is formed between the.
  • Fig. 1 is a diagrammatic view of the circuit arrangement of a lamp comprising my invention
  • Fig. 2 is a similar view of a slightly modified circuit.
  • the lamp comprises a normally operative filament I0 and an auxiliary filament I I which are sealed in the usual glass bulb (not shown).
  • the said filaments are connected at one side to a common lead wire I3 which is 10 electrically connected to one of the lamp'base terminals.
  • the opposite ends of said filaments Ill and II are connected to lead wires- I4 and I5 respectively, said lead wire I4 being electrically connected to the other lamp base terminal.
  • a fuse wire I6 and a spring switch arm I! are incorporated in the lead wire I4 in series with the filament Ill.
  • the switch arm I! may be provided with a contact I8 and the lead wire I5 with a contact I9.
  • Fig. -2 parts corresponding to similar parts in Fig. 1 have been correspondingly numbered.
  • the lead wire I3 is connected directly to filament II] as in Fig. l, but a separate branch lead wire 20 is connected to said lead wire I3 and to the filament I I, and a fuse wire 2
  • said fuse wire being of sufficient size to carry the normal current through said normally operative filament but not an ab- 1 normal current, said switch arm moving into cirwire, and a fuse wire in series with said normally operative filament connected to the other end of said switch arm and holding said switch arm out of engagement with said lead wire of said auxiliary filament, said fuse wire being of sufficlent size to carry the normal current through said normally operative filament but not an abnormal current, said switch am moving into engagement with the said lead wire of said auxiliary filament to close the circuit therethrough when re- 10 leased by the rupturing of said fuse wire.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
US10723A 1934-04-10 1935-03-12 Electric incandescent lamp Expired - Lifetime US2049338A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE434404X 1934-04-10

Publications (1)

Publication Number Publication Date
US2049338A true US2049338A (en) 1936-07-28

Family

ID=6505904

Family Applications (1)

Application Number Title Priority Date Filing Date
US10723A Expired - Lifetime US2049338A (en) 1934-04-10 1935-03-12 Electric incandescent lamp

Country Status (4)

Country Link
US (1) US2049338A (enrdf_load_stackoverflow)
FR (1) FR787061A (enrdf_load_stackoverflow)
GB (1) GB434404A (enrdf_load_stackoverflow)
NL (1) NL39929C (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448493A (en) * 1946-08-30 1948-08-31 Meno Stanley Joseph Multiple life light bulb
US2518909A (en) * 1947-12-13 1950-08-15 Abraham Krakauer Signal responsive to currentpassage time
US2607900A (en) * 1949-11-03 1952-08-19 Tung Sol Lamp Works Inc Cathode-ray tube
US4382209A (en) * 1980-10-06 1983-05-03 General Electric Company Thermal switch and dual filament long life lamp
US4447760A (en) * 1980-08-11 1984-05-08 Ronald Koo Filament switching device
US4580079A (en) * 1980-08-11 1986-04-01 Ronald Koo Multifilament bulb with filament switching device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448493A (en) * 1946-08-30 1948-08-31 Meno Stanley Joseph Multiple life light bulb
US2518909A (en) * 1947-12-13 1950-08-15 Abraham Krakauer Signal responsive to currentpassage time
US2607900A (en) * 1949-11-03 1952-08-19 Tung Sol Lamp Works Inc Cathode-ray tube
US4447760A (en) * 1980-08-11 1984-05-08 Ronald Koo Filament switching device
US4580079A (en) * 1980-08-11 1986-04-01 Ronald Koo Multifilament bulb with filament switching device
US4382209A (en) * 1980-10-06 1983-05-03 General Electric Company Thermal switch and dual filament long life lamp

Also Published As

Publication number Publication date
GB434404A (en) 1935-08-30
FR787061A (fr) 1935-09-16
NL39929C (enrdf_load_stackoverflow)

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