US2327031A - Stem and mount construction - Google Patents

Stem and mount construction Download PDF

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Publication number
US2327031A
US2327031A US454339A US45433942A US2327031A US 2327031 A US2327031 A US 2327031A US 454339 A US454339 A US 454339A US 45433942 A US45433942 A US 45433942A US 2327031 A US2327031 A US 2327031A
Authority
US
United States
Prior art keywords
stem
seal
wires
lamp
filament
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
US454339A
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English (en)
Inventor
Charles L Fantur
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
Priority to BE476887D priority Critical patent/BE476887A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US454339A priority patent/US2327031A/en
Application granted granted Critical
Publication of US2327031A publication Critical patent/US2327031A/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
    • H01K1/18—Mountings or supports for the incandescent body
    • H01K1/22—Lamp stems

Definitions

  • This invention relates to filament mounts suitable for incandescent lamps or other electrical devices, and especially for lamps in which a relatively concentrated light source is desirable, and a relatively high wattage at low voltage, as in the case of certain lamps for producing a definite light beam, such as automobile spotlight lamps, for example.
  • One important aim of the invention is to obviate or minimize deterioration or failure of the inlead seal of such a lamp, owing to the heat to which the seal is subjected because of the high temperature of the concentrated filament and the high amperage current carried by the leads.
  • the drawing is a tilted or perspective view of a lamp conveniently embodying the invention, a portion of the outer lamp envelope being broken away.
  • the drawing illustrates an incandescent lamp with an ordinary type of bulb or envelope It that includes an inward extending hollow stem H with a seal I2 at its inner end.
  • the lamp may be mounted in an ordinary base l3, here shown as of bayonet type.
  • the lamp mount may include the usual exhaust tube It, inside the stem, fused and opening laterally through the stem wall in or just below the seal l2, and itself sealed or tipped off at l5.
  • 9 of the base I3 are sealed through the stem seal l2 and extend therefrom inward into the interior of the bulb ID to supply energy to the incandescent filament 20, which may be a coil of refractory metal, such as tungsten, and is shown bent into a hairpin shape.
  • the lamp bulb It may have the usual gas filling (such as 88 per cent argon and 12 per cent nitrogen), at an absolute pressure of 600 mm. of mercury at ordinary atmospheric temperature.
  • each of the inleads I6, H is composite, consisting of multiple wire strands 2
  • lie at the corners of a rectangle which is very nearly a square.
  • of each lead l6, ll may be twisted together as shown, to facilitate handling them and connecting them to the base contacts i8, i9.
  • of the set forming each lead l5, l6 are slightly offset toward one another in their common plane at 22, 22, and are also both bent (below their oflsets) to slope and diverge outward away from the other lead.
  • each lead It or ll are con- Elected or attached to a stout spud 25, which as here shown consists of a, single stout wire laterally welded to the wires 2
  • each spud 25 lies between its Wires 2
  • the coiled filament 20 has its ends laterally welded to the adjacent ends of the spuds 25, 25, as shown, at the same sides thereof.
  • the spuds 25, 25 extend laterally from the leads l6, l1 and are preferably in axial alignment with one another. With the spuds 25, 25 extending inward toward one another as shown, their inner ends lie close together; but the hairpin arrangement of the filament 20 nevertheless allows it to be made of ample length.
  • the construction described offers important advantages in increased average lamp life, because of the better performance at the seal I2.
  • lamps in which relatively high wattage is developed in a very compact filament arrangement and in a small bulb show many failures due to cracking or other airing up at the seal l2. This is especially true for certain lamps of low voltage and high current, such as a 100 C. P. 5.5. v. lamp in a G16% bulb operating on a current of 12 amperes.
  • a G16 bulb is a spherical or globular bulb 2 inches in diameter, a small space and wall surface for so much energy as 66 watts.
  • both the heat conducted along the leads l5, I! from the filament and that developed in the leads themselves is more evenly distributed in the seal l2, and fewer seal cracks or other early lamp failures occur.
  • inside the bulb l0 allows freer dissipation of' heat by radiation from the leads before it reaches the seal.
  • are easy to bend after sealing in,so that fewer seals are broken or cracked in bending the wires for the purpose of completing the mount.
  • may be of 30 mil nickel and the spuds 25 of mil nickel. This gives much better results than the ordinary constructlon with but two inleads of 50 mil nickel,
  • a stem and filament mount construction comprising a stem with sealed end, pairs of multiple leads sealed through the sealed stem end and extending therefrom, spuds attached to the leads of respective pairs and extending therefrom toward one another, and a coiled filament connected between said spuds.
  • a stem and filament mount construction comprising a stem with sealed end, pairs of multiple leads sealed through the sealed stem 15 attached to the leads of respective pairs and extending therefrom, and a coiled filament connected between said spuds.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
US454339A 1942-08-10 1942-08-10 Stem and mount construction Expired - Lifetime US2327031A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE476887D BE476887A (d) 1942-08-10
US454339A US2327031A (en) 1942-08-10 1942-08-10 Stem and mount construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US454339A US2327031A (en) 1942-08-10 1942-08-10 Stem and mount construction

Publications (1)

Publication Number Publication Date
US2327031A true US2327031A (en) 1943-08-17

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ID=23804220

Family Applications (1)

Application Number Title Priority Date Filing Date
US454339A Expired - Lifetime US2327031A (en) 1942-08-10 1942-08-10 Stem and mount construction

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US (1) US2327031A (d)
BE (1) BE476887A (d)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069583A (en) * 1959-10-30 1962-12-18 Sylvania Electric Prod Electric lamp
US3287591A (en) * 1961-12-13 1966-11-22 Sylvania Electric Prod Tantalum carbide incandescent lamp and method of manufacture thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069583A (en) * 1959-10-30 1962-12-18 Sylvania Electric Prod Electric lamp
US3287591A (en) * 1961-12-13 1966-11-22 Sylvania Electric Prod Tantalum carbide incandescent lamp and method of manufacture thereof

Also Published As

Publication number Publication date
BE476887A (d)

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