US3864598A - Incandescent lamp with internal fuse - Google Patents

Incandescent lamp with internal fuse Download PDF

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Publication number
US3864598A
US3864598A US384744A US38474473A US3864598A US 3864598 A US3864598 A US 3864598A US 384744 A US384744 A US 384744A US 38474473 A US38474473 A US 38474473A US 3864598 A US3864598 A US 3864598A
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US
United States
Prior art keywords
fuse
coiled
spud
filament
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
US384744A
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English (en)
Inventor
Jr John G Cardwell
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
Priority to US384744A priority Critical patent/US3864598A/en
Priority to GB2775774A priority patent/GB1469968A/en
Priority to JP7653274A priority patent/JPS573185B2/ja
Priority to CA205,074A priority patent/CA1015394A/en
Priority to BE146757A priority patent/BE817876A/xx
Priority to DE2434983A priority patent/DE2434983A1/de
Priority to NL7409961A priority patent/NL7409961A/xx
Application granted granted Critical
Publication of US3864598A publication Critical patent/US3864598A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/62—One or more circuit elements structurally associated with the lamp
    • H01K1/66—One or more circuit elements structurally associated with the lamp with built-in fuse

Definitions

  • the fuse [58] Fltld of Search 315/74, 313/315 ber has a coiled portion which is cnnnected to [he [5 e e ce Cited zgltilcj'igre leg portion which is connected to a lead-in UNITED STATES PATENTS 3,211,942 10/1965 Wiley 313/315 7 3 1 INCANDESCENT LAMP WITH INTERNAL FUSE BACKGROUND OF THE INVENTION 1.
  • the invention relates generally to incandescent lamps. More particularly, the invention relates to incandescent lamps having a fuse member internal to the lamp envelope.
  • formed spuds such as .I-hooks or helispuds, are inserted into the ends of the coiled-coil to give stability to the fine wire filament.
  • J-hook spuds or supports are more fully described in US. Pat. Nos. 3,44l,772 and 3,441,776. These spuds are metal conductors with a curved portion which fits inside a portion of the first secondary turn of the coiled-coil or a primary leg.
  • the formed spud is a good conductor and gives mechanical support to the filament, this construction has the disadvantage of conducting heat back into the seal area thereby causing foil shaling and other forms of seal failure.
  • Another problem with formed spuds is because of their relatively large diameter the spud makes a good electrode to conduct the are when the filament fails.
  • a further object of the invention is to provide a fuse internal to the lamp envelope so that any are may be terminated at the earliest possible moment.
  • Still another object of the invention is to provide a fuse construction with a minimum number of parts and a minimum number of manufacturing steps to assemble the lamp.
  • Yet another object of the invention is to provide an internally fused lamp with a formed spud construction which gives good mechanical support and precise location to the filament.
  • a lamp comprised of a vitreous envelope of glass or quartz having a pinch seal at least at one end thereof. Contained within the envelope is a filament preferably of tungsten and preferably of the coiled-coil variety. At least one end of the filament is connected to a formed spud through the insertion ofa curved end of the spud into a portion of the primary turn of the filament.
  • a fuse member containing a coiled portion and a leg portion is positioned on the spud by inserting a straight section of the spud into the coiled portion of the fuse and by attaching the coiled portion to the straight section by a process such as welding.
  • the leg portion of the fuse is then attached to a lead-in conductor, a portion of which is usually a foliated piece of molybdenum.
  • the lamp is then exhausted and filled with an inert gas and a halogen.
  • FIG. I of the drawing is a front elevation view of a lamp of the invention having one fuse;
  • FIG. 2 is a front elevation of a section of the lamp shown in FIG. I;
  • FIG. 3 is a front elevation view of another embodiment of the invention utilizing two fuses and a support.
  • lamp I0 is comprised of a tubular envelope II having pinch seals 12 and I8 at each end. Even though the preferred embodiment is shown as a double-ended lamp containing two pinch seals, it should be remembered that a singleended lamp, one pinch seal, may also successfully utilize the invention.
  • Coil-coiled tungsten filament I3 is connected to formed spuds, helispuds, l4 and 15. These spuds are preferably made of tungsten.
  • the spuds are inserted into the secondary turns of the fila ment, as shown at 16 and 17. The end of the spud is curved so that when it is inserted it will penetrate about one-half turn of the secondary coil.
  • Helispud I4 is sealed in insulating relationship to molybdenum foil 19 which is hermetically sealed in pinch seal I8.
  • Molybdenum foil I9 is connected to outer lead 20 which makes electrical contact to a power source. not shown, through tab 2].
  • Insulating base 22 is held firmly in place on pinch seal 18 by a quantity of cement 23.
  • helispud 15 which is attached to coiled-coil I3 at location I6 is connected to foil 29 in pinch seal 12.
  • fuse member 25 is comprised of coiled section 26 and leg portion 27.
  • Coiled section 26 should have more than one turn of wire to facilitate supporting the formed spud and making electrical contact with it.
  • several of the coiled segments are attached to the spud to further facilitate contact and support as shown at 28 in FIG. 2.
  • Leg portion 27 extends into pinch seal 12 and is attached to molybdenum foil I9.
  • the foil in turn is connected to outer lead-in conductor 20 and tab 2l.
  • Insulating base 22 is attached to the tab and pinch seal by cement 23.
  • Test data from lamps of the construction illustrated in FIG. 1 indicates that lamps using a helispud and fuse member such as 25 have improved life over a construction which does not utilize the fuse but merely utilizes helispuds attached directly to foil leads. Most of the improvement appears to be due to the reduction in foil failures caused by excessive heat being conducted back to the foil from the relatively heavy helispud.
  • IZO-volt design known as a DXW.
  • the fuse was made of tungsten wire with a 0.0l5-inch diameter, and it was attached as shown at 28 to a helispud of approximately 0.032-inch diameter.
  • the particular fuses used had a minimum of five turns in the coiled section 26. With five turns, this allows welding of one or more turns to the spud but at the same time keeps a number of turns available if the welded turns would fracture due to tungsten embrittlement. The other turns could continue to support and make contact with the helispud.
  • FIG. 3 A further improvement in lamp life was noticed when lamps similar to the construction of lamp 40, shown in FIG. 3. had two fused helispuded ends instead of one.
  • the lamp shown in FIG. 3 is basically the same as that shown in FIGS. 1 and 2, and like parts are designated by like numerals except the numbers in FIG. 3 are followed by the letter a.
  • Coiled-coil 13a is connected to helispuds 14a and 1511 through insertion of a curved portion of the helispuds into the secondary turns such as at 160.
  • the other ends of helispuds 14a and 150 are embedded in pinch seals 12a and 18a in insulating relationship to foil conductors 19a and 29a.
  • Fused members 250 are attached to the helispuds by welding. for example. at locations 280.
  • Coiled section 26a of the fuse is shown as having a plurality of turns generally more than five.
  • Fuse legs 27a are attached to foil conductors 19a and 290 which in turn make electrical contact with tabs 21a and 31a through outer conductors a and 30a.
  • Insulating bases 22a and 32a are held to the pinch seals and tabs by cement 23a and 33a.
  • Coil support 35 is used to give the filament additional stability and to prevent sagging. The ends of the support are anchored in the respective pinch seals.
  • a lamp construction using two fuses is desirable for ("ill yet another reason. When two fuses are used. they are connected in series and therefore each fuse has only half the voltage across it. This in turn reduces the tendency of arcing at the fuse itself.
  • An electric incandescent lamp comprising an envelope of vitreous material having at least one pinch seal at one end of the envelope, an incandcscible filament of the coiled-coil type made of fine wire connected at one end to a formed spud.
  • said spud having its opposite end sealed in said pinch seal in insulating relationship to a lead-in conductor, and a fuse member electrically connected to the spud at one end and a lead-in conductor at the other end.
  • said fuse member comprising a coiled portion fitted over the formed spud which is sealed in said pinch seal and a leg portion, said leg portion being attached to a foliated section of the lead-in conductor, said filament being unsupported by said fuse member.
  • An electric incandescent lamp comprising a tubular envelope of vitreous material having pinch seals at each end, an incandescible coiled-coil filament made of fine wire, said filament connected at each end to a formed spud, the opposite ends of the spuds being sealed in said pinch seals in insulating relationship to lead-in conductors. and fuse members connected to each spud at one end and a lead-in conductor at the other end. said lead-in conductor being hermetically sealed in said pinch seals, said fuse members comprising a coiled portion fitted over the spuds and a leg portion. said leg portion being attached to said hermetically sealed lead-in conductors. said filament being unsupported by said fuse members.

Landscapes

  • Fuses (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US384744A 1973-08-01 1973-08-01 Incandescent lamp with internal fuse Expired - Lifetime US3864598A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US384744A US3864598A (en) 1973-08-01 1973-08-01 Incandescent lamp with internal fuse
GB2775774A GB1469968A (en) 1973-08-01 1974-06-21 Incandescent lamp with internal fuse
JP7653274A JPS573185B2 (en]) 1973-08-01 1974-07-05
CA205,074A CA1015394A (en) 1973-08-01 1974-07-15 Incandescent lamp with internal fuse
BE146757A BE817876A (fr) 1973-08-01 1974-07-19 Lampe a incandescence
DE2434983A DE2434983A1 (de) 1973-08-01 1974-07-20 Gluehlampe mit innerer sicherung
NL7409961A NL7409961A (nl) 1973-08-01 1974-07-23 Gloeilamp met inwendige smeltveiligheid.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US384744A US3864598A (en) 1973-08-01 1973-08-01 Incandescent lamp with internal fuse

Publications (1)

Publication Number Publication Date
US3864598A true US3864598A (en) 1975-02-04

Family

ID=23518573

Family Applications (1)

Application Number Title Priority Date Filing Date
US384744A Expired - Lifetime US3864598A (en) 1973-08-01 1973-08-01 Incandescent lamp with internal fuse

Country Status (7)

Country Link
US (1) US3864598A (en])
JP (1) JPS573185B2 (en])
BE (1) BE817876A (en])
CA (1) CA1015394A (en])
DE (1) DE2434983A1 (en])
GB (1) GB1469968A (en])
NL (1) NL7409961A (en])

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066926A (en) * 1976-10-12 1978-01-03 Westinghouse Electric Corporation Gas-filled incandescent lamp with integral fuse assembly
US4132922A (en) * 1977-10-13 1979-01-02 Westinghouse Electric Corp. Gas-filled incandescent lamp with integral fuse assembly
US4216406A (en) * 1976-02-27 1980-08-05 Lumalampan Aktiebolag Electric lamp wherein the terminal socket cap contains a foamed cap cement which functions to prevent explosions and/or burning a hole through the cap
FR2478877A1 (fr) * 1980-03-21 1981-09-25 Philips Nv Lampe a incandescence a l'halogene munie d'un fusible incorpore
US4551617A (en) * 1983-06-15 1985-11-05 Thorn Emi Domestic Appliances Limited Heating apparatus
EP0160311A1 (en) * 1984-05-04 1985-11-06 Kabushiki Kaisha Toshiba High-pressure metal vapor discharge lamp
US6037854A (en) * 1998-05-01 2000-03-14 Aerospace Lighting Corporation Thermal fuse for fluorescent lamps
US6806656B2 (en) 2002-12-16 2004-10-19 Sienna Llc Fuse bulb twinkle light set

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191483A (en) * 1978-04-17 1980-03-04 Scm Corporation Typewriter key action
JPS6156470U (en]) * 1984-09-18 1986-04-16

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211950A (en) * 1963-02-20 1965-10-12 Gen Electric Electric incandescent lamp with integral fuse
US3211942A (en) * 1963-06-20 1965-10-12 Gen Electric Electric incandescent lamp
US3211943A (en) * 1963-10-07 1965-10-12 Gen Electric Electric incandescent lamp
US3346768A (en) * 1964-10-29 1967-10-10 Gen Electric Incandescent lamp with a fuse integral with the lead-in structure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4324708Y1 (en]) * 1965-09-07 1968-10-17
JPS4325743Y1 (en]) * 1966-11-08 1968-10-28

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211950A (en) * 1963-02-20 1965-10-12 Gen Electric Electric incandescent lamp with integral fuse
US3211942A (en) * 1963-06-20 1965-10-12 Gen Electric Electric incandescent lamp
US3211943A (en) * 1963-10-07 1965-10-12 Gen Electric Electric incandescent lamp
US3346768A (en) * 1964-10-29 1967-10-10 Gen Electric Incandescent lamp with a fuse integral with the lead-in structure

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216406A (en) * 1976-02-27 1980-08-05 Lumalampan Aktiebolag Electric lamp wherein the terminal socket cap contains a foamed cap cement which functions to prevent explosions and/or burning a hole through the cap
US4066926A (en) * 1976-10-12 1978-01-03 Westinghouse Electric Corporation Gas-filled incandescent lamp with integral fuse assembly
US4132922A (en) * 1977-10-13 1979-01-02 Westinghouse Electric Corp. Gas-filled incandescent lamp with integral fuse assembly
FR2478877A1 (fr) * 1980-03-21 1981-09-25 Philips Nv Lampe a incandescence a l'halogene munie d'un fusible incorpore
US4551617A (en) * 1983-06-15 1985-11-05 Thorn Emi Domestic Appliances Limited Heating apparatus
EP0160311A1 (en) * 1984-05-04 1985-11-06 Kabushiki Kaisha Toshiba High-pressure metal vapor discharge lamp
US4686422A (en) * 1984-05-04 1987-08-11 Kabushiki Kaisha Toshiba High-pressure metal vapor discharge lamp with characteristic fuse action
US6037854A (en) * 1998-05-01 2000-03-14 Aerospace Lighting Corporation Thermal fuse for fluorescent lamps
US6806656B2 (en) 2002-12-16 2004-10-19 Sienna Llc Fuse bulb twinkle light set

Also Published As

Publication number Publication date
JPS5038974A (en]) 1975-04-10
GB1469968A (en) 1977-04-14
JPS573185B2 (en]) 1982-01-20
BE817876A (fr) 1974-11-18
DE2434983A1 (de) 1975-02-13
CA1015394A (en) 1977-08-09
NL7409961A (nl) 1975-02-04

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