US1637034A - Coiled-filament incandescent lamp - Google Patents

Coiled-filament incandescent lamp Download PDF

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Publication number
US1637034A
US1637034A US678515A US67851523A US1637034A US 1637034 A US1637034 A US 1637034A US 678515 A US678515 A US 678515A US 67851523 A US67851523 A US 67851523A US 1637034 A US1637034 A US 1637034A
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US
United States
Prior art keywords
filament
leads
coiled
tungsten
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
US678515A
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English (en)
Inventor
Bergmans Jan
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 US1637034A publication Critical patent/US1637034A/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
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/16—Electric connection thereto

Definitions

  • This invention relates to improvements'in gasfilled electric incandescent lamps having helically wound filaments of tungsten for example and more particularly to projection lamps of this type.
  • the ditficulty above described is obviated by disposing each end of the helically wound filament around a mandril of a metal or a metal alloy having a high melting point whereupon the said ends together with the mandril are fixed to the leads preferably by welding.
  • the filament is made of tungsten
  • the mandril is preferably made of tungsten or molybdenum.
  • an attachment of the incan descent filament to the leads by welding has particular advantages.
  • the attachment of the filament by welding is more advisable than by pinching it in the bent ends of the leads, particularly int-he case of filaments having a rather considerable diameter-such for example as are frequently tound inprojecti-on lamps.
  • a filament of tungsten to a lead of nickel a tungsten-nickel alloy is produced which in many cases has a materially lower melting point than tungsten and thus the point of connection between the filament and the leads is weakened.
  • the lowering of the melting point is not troublesome because the ends of the leads remain at a low temperature.
  • a mandril welding ensures not only a good attachment of the filament to the leads but also a good contact between the filament and the mandril.
  • the leads may also be disposed in such a manner that those parts to which the ends of the filament together with the mandrils are fixed are more widely spaced than in case of fixing the filament directly to the leads and thus the risk of gas discharges is further decreased.
  • the 'helically wound ends of the filament may according to the present invention be disposedaround mandrils of a metal or a metal alloy having ahigh melting point, such for example as tungsten or molybdenum and together with the mandrils they may be fixed to the pole wires, those parts of the leads that are fixed to the end of the filament being located on the upper lateral side of the filament.
  • the coils of the filament may be parallel or they may be V-shaped and situated side by side in a plane surface or in a curved surface or again they may be arranged one behind the other in various planes as is the practice for example in projection. lamps.
  • the ends of the filament thatare dis-' posed around the lnandril may preferably be arranged substantially normally to that way of tungsten, which is cated on the lower lateral side of the filament as otherwise their temperature increases toomuch.
  • This arrangement however is objectionable as it is not possible for those wire coils directly connected with the poles to sag freelyfso that ad acent coils may contact with each other and thereby cause the lamp to deteriorate.
  • the ends of the leads are spaced from the illuminant proper and moreover they are substantially outside the hot flow of gas rising from the illuminant so that they remain rather cold although they are arranged on the upper lateral side of the illuminant.
  • Figure 1 is a front elevation of a projection lamp inwhich those parts, of the leads that are connected to the ends of the filament are arranged onthe upper lateral side-of the illuminant.
  • Figure 2 is a side elevation of the illuminant with the leads and of the suspension device of the illuminant
  • Figure 3 is a detail on a large scale of the attachment of the illuminant to the lead.
  • the lamp shown in Figure 1 comprises a sealed glas bulb 1 into which a stem 2 is sealed. 'lwo leading-in wires connected to leads 4 and, 5 of nickel for example, are sealed in the clamped portion of the stem.
  • a filament 6 is connected to the leads, its helically wound ends 7 and 8 being disposed around mandrils 11 of some metal, such as substantially as refractory as the filament and together with the latter welded to the leads.
  • the two mandrels are, as best shown in Figure 1, mounted on the leads to project toward each other in the plane of the leads and be end to end.
  • the stem 2 supports also the glass rod 3 which is bent in the manner shown in Figure 2.
  • the filament 6 which consists of V-sh'aped coils arranged side by side in a plane surface in the plane of the leads is suspended by means of two intermediate bends of the ll-shaped wire on two hooks 9 of molybdenum for example. .On the lower side any displacement in the transverse direction'of the illuminant is prevented by hooks 10 which may likewise be of molybdenum. It "is however possible for the lower parts of the filament-to move freely upwards and downwards in the said hooks and consequently the coils which, are
  • 5 is the end ofthe lead.
  • the helically wound end 8' of the filament is disposed on a mandrilll of tungsten for example which has preferably the same diameter as the mandril used when coiling the filament so that the mandrel is telescoped into the end of the coiled filament.
  • l he end 8 together with the mandril l1 are connected to the lead by welding.
  • An incandescent lamp comprising a sealed envelope containing a .pair of leads, a
  • An incandescent lamp comprising a sealed envelope containing a pair of leads. a coiled tungsten filament, and a pair of cylindrical tungsten mandrels telescoped into the ends of said filament and welded at their ends to said leads and to'the ends of said filament to project from said leads end to end and in the plane of said leads, the intermediate portion of said filament being bent into coiled sections side by side in the plane of said leads.
  • An incandescent lamp comprising a sealed envelope containing a pair of leads. a coiled tungsten filament, and a pair of cylindrical tungsten mandrels telescoped in-

Landscapes

  • Wire Processing (AREA)
  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US678515A 1922-12-23 1923-12-04 Coiled-filament incandescent lamp Expired - Lifetime US1637034A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL209051X 1922-12-23

Publications (1)

Publication Number Publication Date
US1637034A true US1637034A (en) 1927-07-26

Family

ID=19778722

Family Applications (1)

Application Number Title Priority Date Filing Date
US678515A Expired - Lifetime US1637034A (en) 1922-12-23 1923-12-04 Coiled-filament incandescent lamp

Country Status (4)

Country Link
US (1) US1637034A (en:Method)
FR (1) FR560310A (en:Method)
GB (1) GB209051A (en:Method)
NL (1) NL13404C (en:Method)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848642A (en) * 1954-11-19 1958-08-19 Westinghouse Electric Corp Filament mounting
US3383539A (en) * 1967-02-06 1968-05-14 Sylvania Electric Prod Projection lamp
US3470413A (en) * 1966-04-28 1969-09-30 Sylvania Electric Prod Projector lamp filament support
US4032809A (en) * 1966-03-21 1977-06-28 Westinghouse Electric Corporation Tantalum carbide or tantalum-alloy carbide filament mounting and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848642A (en) * 1954-11-19 1958-08-19 Westinghouse Electric Corp Filament mounting
US4032809A (en) * 1966-03-21 1977-06-28 Westinghouse Electric Corporation Tantalum carbide or tantalum-alloy carbide filament mounting and method
US3470413A (en) * 1966-04-28 1969-09-30 Sylvania Electric Prod Projector lamp filament support
US3383539A (en) * 1967-02-06 1968-05-14 Sylvania Electric Prod Projection lamp

Also Published As

Publication number Publication date
FR560310A (fr) 1923-10-02
GB209051A (en) 1924-05-15
NL13404C (en:Method) 1925-08-15

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