US3534216A - Lamp base for electric gaseous discharge devices - Google Patents

Lamp base for electric gaseous discharge devices Download PDF

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Publication number
US3534216A
US3534216A US811778A US3534216DA US3534216A US 3534216 A US3534216 A US 3534216A US 811778 A US811778 A US 811778A US 3534216D A US3534216D A US 3534216DA US 3534216 A US3534216 A US 3534216A
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US
United States
Prior art keywords
lamp
base
lead
wires
boss
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
US811778A
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English (en)
Inventor
Marcellus N Gilbert Jr
Harold I Wiley Jr
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Application granted granted Critical
Publication of US3534216A publication Critical patent/US3534216A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
    • H01J5/56—Shape of the separate part

Definitions

  • a base for a lamp having a pair of lead-in wires extending from an end thereof.
  • the base is a one-piece, molded member of thermoplastic material having a boss within which the lamp lead-in wires are secured to barbed, bifurcated metal clips.
  • This invention relates to bases for electric lamps and more particularly to bases for elongated tubular lamps.
  • the lamp envelope is usually provided with a base at each end thereof.
  • the bases which serve as the supporting elements of the lamp, also constitute means through which electrical energy may be transmitted from holders in which the lamp is supported to electrodes within the lamp envelope.
  • the base with which each end of the lamp envelope is provided, comprises an annular metal shell, a disk of insulating material supported therein and a pair of metal pins secured to and extending from the disk of insulating material.
  • Lead-in wires to which a lamp electrode is connected, project from the end of the lamp envelope and terminate in the base pins.
  • the lead-in wires are secured to the base pins by suitable means, such as by welding or soldering for example.
  • the base in another form of fluorescent lamp construction, has no base pins.
  • the base comprises an annular metal shell, a disk of insulating material supported therein, a boss formed integral with the disk and a pair of flat, relatively wide, metal strips disposed in the disk, with the metal strips serving as the electrical contact members of the base.
  • Each lamp lead-in wire is attached, as by welding for example, to one of these metal strips at or near one end thereof.
  • the lampholder contacts positively engage a relatively large surface area of these metal strips at a location relatively distant from the point at which the lead-in wires are attached thereto.
  • the electrical contact surfaces of the base comprise continuous, flat, wide surfaces undamaged and uncontaminated by lamp processing operations, providing thereby the optimum possible contact conditions at all times.
  • the principal object of this invention is to provide an improved lamp base of the pinless type in which the advantages of some form of metal strip as a base contact is retained and the disadvantages of welding as noted above are eliminated.
  • FIG. 1 is an elevational view of a fluorescent lamp provided with bases embodying this invention.
  • FIG. 2 is an enlarged cross sectional view of one of the bases of FIG. 1 prior to the insertion of the clips therein.
  • FIG. 3 is a further enlargement in section of a portion of the base of FIG. 2 with the clips inserted therein.
  • FIG. 4 is an enlarged view in section of a portion of the base taken along the line 44 of FIG. 3.
  • FIG. 1 a fluorescent lamp 1 of a conventional commercial type, i.e., an elongated tubular envelope 3 provided with a coating of fluorescent material on the inner wall thereof and having a mount sealed therein at each end thereof.
  • Each mount includes a filamentary electrode having a coating thereon of electron emissive material and a pair of lead-in wires extending from the filamentary electrode to the exterior of the hermetically sealed lamp to provide the means through which connections to a source of electrical energy are established.
  • Each end of the lamp envelope 3 is provided with a base 5, an enlarged cross sectional view of one of these bases being illustrated in FIG. 2.
  • the base '5 comprises a cap 7 of thermoplastic material, such as a silicate-reinforced polyamid for example, secured to the end of lamp envelope 3 by basing cement 9 and a central boss 11, substantially rectangular in contour, preferably formed integral therewith.
  • the cap 7 and the boss 11 are provided with aligned openings defining a central aperture 13 extending therethrough.
  • a pair of opposite side walls 15 of the substantially rectangular boss 11 are not as tall as the other pair of walls and thus slots 17 at a pair of opposite ends of the boss are defined.
  • Each of these walls 15 is provided with a bore 19 extending therethrough and a slot 21 formed therein from the top face thereof.
  • Each of the lead-in wires 23 and 25 extending from the end of lamp envelope 3 is threaded through the funnel-shaped entrance of its corresponding bore 19 and bent inwardly toward the central aperture 13, so that it lies within slot 17 and overlies its related slot 21.
  • a substantially U-shaped metal clip 27 is then driven into the boss 11 to secure each of the lead-in wires thereto within the boss.
  • each substantially U-shaped metal clip 27 is characterized by a long leg 29 and a short leg 31.
  • the long leg 29 lies along the inside face of wall 15 of boss 11 within central aperture 13 and thus is accessible for engagement by a mating electrical contact member of a lampholder.
  • the short leg 31 is provided with a tapered bifurcation 33, each prong 35 of which is provided with a set of barbs 37.
  • the adjacent inside faces of the prongs 35 which define the tapered bifurcation 33 engage, grip and bite into the lateral leg 22 of the lead-in wire as shown in FIG. 4.
  • the barbs 37 thereof are in firm frictional engagement with the wall of the slot 21 and will dig into the thermoplastic material and thus resist any force which might tend to dislodge it.
  • the base of this invention readily lends itself to mass production assembly techniques and provides a product structure having several advantages over the bases of this type available heretofore.
  • the base of this invention is a thermoplastic member molded in one piece whereas heretofore these bases usually comprised an aluminum shell and an insulating member having a disc or wafer portion and a boss portion which had to be assembled.
  • these bases due to the ditference in expansion rates of glass and aluminum, there was the tendency for ring strains to develop when the aluminum shell was cemented to the lamp base line. Due to the resilience of the thermoplastic material, no such problem arises with the base of this invention.
  • the lamp-base assembly operation may be performed by first feeding the lamp lead-in wires 23, 25 through the funnel-shaped entrance, into and through the bores 19, trimming them as required and then forming them to define lateral legs 22 overlying slots 21.
  • An electrical continuity test may then be performed to detect the presence and proper positioning of the lead-in wires. If the electrical circuit through the lead-in 'wires and the filamentary electrode of the lamp tests open, this indicates that the lead-in wires are not properly positioned and thus the metal clips 27 may be withheld and the lamp withdrawn from the line for inspection and reworking. On the other hand, such an intermediate testing at this point was not possible with the base superseded by the base of this'invention and missed welds could be detected only after completion of the assembly operation.
  • the metal clips 27 are driven into the boss 11 to secure the lead-in wires 23, 25 thereto as described above in connection with the description of FIGS. 3 and 4.
  • a base for an electric lamp having a pair of lead-in wires projecting from an end thereof comprising a unitary body member of thermoplastic material having a cap, a central boss and a central aperture extending therethrough; means in said unitary body member for re ceiving said projecting lead-in wires; and a substantially U-shaped metal clip driven into said central boss and securing therein each of said lead-in wires.
  • one leg of said U-shaped metal clip is provided with a tapered bifurcation within which said lead-in wire is wedged, said tapered bifurcation defining a pair of prongs having barbs formed therein for securing said clip in said boss.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US811778A 1969-04-01 1969-04-01 Lamp base for electric gaseous discharge devices Expired - Lifetime US3534216A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81177869A 1969-04-01 1969-04-01

Publications (1)

Publication Number Publication Date
US3534216A true US3534216A (en) 1970-10-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US811778A Expired - Lifetime US3534216A (en) 1969-04-01 1969-04-01 Lamp base for electric gaseous discharge devices

Country Status (4)

Country Link
US (1) US3534216A (fr)
BE (1) BE748280A (fr)
DE (1) DE7011415U (fr)
FR (1) FR2045271A5 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473784A1 (fr) * 1980-01-12 1981-07-17 Wagener Gmbh Fritz Lampe fluorescente dont le culot est colle au tube sous verrouillage avec le collet du tube, et son procede de fabrication
US4324998A (en) * 1980-04-02 1982-04-13 Westinghouse Electric Corp. Base and terminal-pin assembly for an electric lamp
US4326146A (en) * 1980-04-02 1982-04-20 Westinghouse Electric Corp. Base and terminal-pin assembly for electric lamps and similar devices
US4854888A (en) * 1988-05-31 1989-08-08 Gte Products Corporation Lamp base
US4878854A (en) * 1988-05-31 1989-11-07 Gte Products Corporation Lamp base
US5210461A (en) * 1992-02-18 1993-05-11 Gte Products Corporation Arc discharge lamp containing mechanism for extinguishing arc at end-of-life
US20100296005A1 (en) * 2008-02-19 2010-11-25 Sharp Kabushiki Kaisha Discharge tube, lighting device, display device, and television receiver
US20140153231A1 (en) * 2012-12-03 2014-06-05 Osram Gmbh Lighting device including interconnected parts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645736A (en) * 1952-05-17 1953-07-14 Chrysler Corp Electric light bulb unit
US2705310A (en) * 1954-04-19 1955-03-29 Gen Electric Metal sleeve base terminal
US3320466A (en) * 1959-10-23 1967-05-16 Gen Electric Double-ended electric lamp and associated u-shaped metal clip
US3372363A (en) * 1964-10-05 1968-03-05 Roberto L. Bustamante Light bulb construction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645736A (en) * 1952-05-17 1953-07-14 Chrysler Corp Electric light bulb unit
US2705310A (en) * 1954-04-19 1955-03-29 Gen Electric Metal sleeve base terminal
US3320466A (en) * 1959-10-23 1967-05-16 Gen Electric Double-ended electric lamp and associated u-shaped metal clip
US3372363A (en) * 1964-10-05 1968-03-05 Roberto L. Bustamante Light bulb construction

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473784A1 (fr) * 1980-01-12 1981-07-17 Wagener Gmbh Fritz Lampe fluorescente dont le culot est colle au tube sous verrouillage avec le collet du tube, et son procede de fabrication
US4324998A (en) * 1980-04-02 1982-04-13 Westinghouse Electric Corp. Base and terminal-pin assembly for an electric lamp
US4326146A (en) * 1980-04-02 1982-04-20 Westinghouse Electric Corp. Base and terminal-pin assembly for electric lamps and similar devices
US4854888A (en) * 1988-05-31 1989-08-08 Gte Products Corporation Lamp base
US4878854A (en) * 1988-05-31 1989-11-07 Gte Products Corporation Lamp base
US5210461A (en) * 1992-02-18 1993-05-11 Gte Products Corporation Arc discharge lamp containing mechanism for extinguishing arc at end-of-life
US20100296005A1 (en) * 2008-02-19 2010-11-25 Sharp Kabushiki Kaisha Discharge tube, lighting device, display device, and television receiver
US20140153231A1 (en) * 2012-12-03 2014-06-05 Osram Gmbh Lighting device including interconnected parts
US10422513B2 (en) * 2012-12-03 2019-09-24 Ledvance Gmbh Lighting device including interconnected parts

Also Published As

Publication number Publication date
BE748280A (fr) 1970-09-16
FR2045271A5 (fr) 1971-02-26
DE7011415U (de) 1970-07-30

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