US2733377A - Incandescent lamp comprising two - Google Patents

Incandescent lamp comprising two Download PDF

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Publication number
US2733377A
US2733377A US2733377DA US2733377A US 2733377 A US2733377 A US 2733377A US 2733377D A US2733377D A US 2733377DA US 2733377 A US2733377 A US 2733377A
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US
United States
Prior art keywords
filaments
filament
lamp
incandescent lamp
common
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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
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English (en)
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Publication of US2733377A publication Critical patent/US2733377A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K9/00—Lamps having two or more incandescent bodies separately heated
    • H01K9/08—Lamps having two or more incandescent bodies separately heated to provide selectively different light effects, e.g. for automobile headlamp

Definitions

  • the invention relates to a two-filament electric incandescent lamp, generally used in automobile headlamps, in which one filament is positioned in front of a reflector slightly above the axis of the lamp and in the direction of a shielding cap for providing a low beam While the other filament is positioned coaxial with the lamp axis and provides distant illumination.
  • the directions of winding 7 of the coiled filaments superposed in their direction of length are opposite such that the filament ends secured to the common terminal wire extend along the same tangential plane of the filaments.
  • Figure la is a reduced scale, sectional view on line AB of Figure 1;
  • Figure 1b is a reduced scale, sectional view on line C-D of Figure 1.
  • the glass bulb shown in Fig. 1 contains a screen 2 supported only by a supporting wire 2a consisting of an electrically conducting terminal wire.
  • the screen 2 is concave.
  • the hollow member is to be imagined to lie behind the plane of, the drawing.
  • a filament 3 is connected The other end of 'the filament 3 is similarly connected at 5 to the terminal wire 6.
  • Below the auxiliary coil 3 extendsthe main filament 7, whose top 8 is also connected to the wire 6, its bottom end being secured to a terminal wire 9.
  • the filaments 3 and 7 are arranged co-axially with the axis of the lamp. As an alternative, this only holds with respect to the filament 7.
  • the filament 3 extends slightly beyond the axis of the lamp, so that in the drawing it would extend in front of its plane.
  • the filament coils constituting the glowing members 3 and 7 have difierent directions of winding.
  • the filament coil of the lower filament 7 is wound counterclockwise and that of the glowing member 3 is wound clockwise, thus achieving that at 5 and 8 the filament ends attached to the common terminal wire 6 extend along the same plane and permit attachment without bending the tungsten wire.
  • the common terminal wire 6 must be provided laterally of the axes of the glowing members and consequently of the axis of the lamp, hence no troublesome shadows are cast when controlling, by optical projection of the lamp system, the spacings to be maintained in manufacturing the lamp.
  • each of Figures 1a and 1b show on a reduced scale a plan view obtained by sections along the straight lines AB and CD.
  • An electric incandescent lamp comprising two approximately coaxially-mounted axially-spaced oppositelywound filaments, a common conductor extending adjacent and parallel to said filaments and supporting the same in their operative position, and terminal means for said filaments including adjacent terminal means to connect each of said filaments to said common conductor, said adjacent terminal means each, extending substantially entirely in a plane common to both of said filaments and tangent to said common conductor.
  • An electric incandescent lamp comprising a bulb having a central axis, two axially-spaced oppositelywound filaments in said bulb, said filaments being mounted substantially coaxially with each other and with the bulb, a common conductor extending adjacent and parallel to said filaments and supporting the same in their operative position, terminal means for said filaments including adjacent terminal means to connect each of said filaments to said common conductor, said adjacent terminal means each extending substantially entirely in a plane common to both of said filaments and tangent to said common conductor, and a cup-like hollow mem' ber half-surrounding one of said filaments.

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US2733377D 1951-10-06 Incandescent lamp comprising two Expired - Lifetime US2733377A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP6288D DE887843C (de) 1951-10-06 1951-10-06 Elektrische Gluehlampe mit zwei Gluehdraehten, insbesondere fuer Kraftwagenscheinwerfer

Publications (1)

Publication Number Publication Date
US2733377A true US2733377A (en) 1956-01-31

Family

ID=40622216

Family Applications (1)

Application Number Title Priority Date Filing Date
US2733377D Expired - Lifetime US2733377A (en) 1951-10-06 Incandescent lamp comprising two

Country Status (7)

Country Link
US (1) US2733377A (en, 2012)
BE (1) BE514629A (en, 2012)
CH (1) CH304864A (en, 2012)
DE (1) DE887843C (en, 2012)
FR (1) FR1073958A (en, 2012)
GB (1) GB720130A (en, 2012)
NL (2) NL89412C (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156843A (en) * 1960-10-27 1964-11-10 Sylvania Electric Prod Incandescent lamp mount
US3548244A (en) * 1968-07-01 1970-12-15 British Lighting Ind Ltd Lamp having twin filaments and integral filament legs mounted in a bridge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10219729A1 (de) * 2002-05-02 2003-11-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Glühlampe für Kraftfahrzeugscheinwerfer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084750A (en) * 1935-01-29 1937-06-22 Edison Inc Thomas A Gaseous discharge system
US2558568A (en) * 1946-11-27 1951-06-26 Vibranic Ltd Device for producing infrared rays
US2617062A (en) * 1949-04-13 1952-11-04 Hartford Nat Bank & Trust Co Electric incandescent lamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084750A (en) * 1935-01-29 1937-06-22 Edison Inc Thomas A Gaseous discharge system
US2558568A (en) * 1946-11-27 1951-06-26 Vibranic Ltd Device for producing infrared rays
US2617062A (en) * 1949-04-13 1952-11-04 Hartford Nat Bank & Trust Co Electric incandescent lamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156843A (en) * 1960-10-27 1964-11-10 Sylvania Electric Prod Incandescent lamp mount
US3548244A (en) * 1968-07-01 1970-12-15 British Lighting Ind Ltd Lamp having twin filaments and integral filament legs mounted in a bridge

Also Published As

Publication number Publication date
NL172909B (nl)
GB720130A (en) 1954-12-15
DE887843C (de) 1953-08-27
NL89412C (en, 2012) 1958-06-16
FR1073958A (fr) 1954-09-30
CH304864A (de) 1955-01-31
BE514629A (en, 2012)

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