EP0589730B1 - Lampe électrique - Google Patents

Lampe électrique Download PDF

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Publication number
EP0589730B1
EP0589730B1 EP19930307639 EP93307639A EP0589730B1 EP 0589730 B1 EP0589730 B1 EP 0589730B1 EP 19930307639 EP19930307639 EP 19930307639 EP 93307639 A EP93307639 A EP 93307639A EP 0589730 B1 EP0589730 B1 EP 0589730B1
Authority
EP
European Patent Office
Prior art keywords
lamp
annular
base
shell
seal
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
EP19930307639
Other languages
German (de)
English (en)
Other versions
EP0589730A1 (fr
Inventor
Dennis Spaulding
Nicholas Brett
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.)
Flowil International Lighting Holding BV
Original Assignee
Flowil International Lighting Holding BV
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 claimed from US07/951,521 external-priority patent/US5432400A/en
Priority claimed from US07/951,509 external-priority patent/US5254025A/en
Application filed by Flowil International Lighting Holding BV filed Critical Flowil International Lighting Holding BV
Publication of EP0589730A1 publication Critical patent/EP0589730A1/fr
Application granted granted Critical
Publication of EP0589730B1 publication Critical patent/EP0589730B1/fr
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
    • H01J5/58—Means for fastening the separate part to the vessel, e.g. by cement
    • H01J5/60—Means for fastening the separate part to the vessel, e.g. by cement for fastening by mechanical means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
    • H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap

Definitions

  • This invention relates to electric lamps.
  • a lamp base comprises a metallic (e.g., aluminium) or plastic shell secured to an end portion of the lamp envelope.
  • a metallic base shell at least one insulating disc is fixed in the shell for carrying one or more hollow base pins or contacts into which the lamp lead wires are electrically secured.
  • the lamp is supported by a holder or socket into which the lamp base extends for connection to a source of electrical energy.
  • each base is first fitted loosely onto a respective end portion of the lamp envelope. Thereafter, the cement is cured (e.g., by heating) which allows the base to adhere to the lamp bulb and withstand industry torque requirements.
  • US-A-2,993,191 discloses a base for an electric discharge lamp wherein the base is constructed from resin having a modulus of elasticity which is greater than 5,000 kg/cm 2 and as high as about 19,000 kg/cm 2 .
  • the resin has a breaking dilation of more than 50% and as high as about 230% and has an initial softening temperature of as low as about 150° Celsius and as high as about 210° Celsius.
  • the base is positioned with the annular wall adjacent to the trough of a bulb end which has been heated to about 330° to 350° Celsius.
  • the base material melts and occupies the trough or channel and by reason of the character of the material of which the base is composed, adheres to the surface of the glass bulb.
  • the base may be pressed against the bulb end to cause an annular rib or reinforcement to snap over the bead or rim and into a trough or channel of the bulb without heating the bulb neck.
  • US-A-4,221,453 discloses a socket capping (i.e., base) for a fluorescent lamp.
  • the base comprises a frontal portion, contact pins electrically connected to the connecting wires, at least one drop of glue which dries at room temperature, and an annular wall extending circumferentially from and perpendicular to the frontal portion.
  • the annular wall has at least two, equally circumferentially spaced knobs protruding inwardly.
  • the base is formed from an elastic, bendable thermoplastic material so that when the base is fitted to the tube over the end portions, the annular wall elastically deforms and the knobs slide over the collar and snap into the groove of the lamp end portion.
  • the base is formed with radial ribs to be disposed into notches provided in the bulb neck.
  • a lamp comprising an envelope having an end portion onto which is sealed a lamp base, the end portion having an annular seal and the lamp base including a shell having an annular portion which is engaged with the annular seal so as to retain the lamp base on the envelope in a sealing condition, the shell having been heated to facilitate engagement of the annular portion over the seal and subsequently cooled to effect an interference fit with the seal.
  • the present invention is characterised in that the shell is a metallic material.
  • a lamp i.e., an incandescent lamp, a fluorescent lamp, a high intensity discharge lamp, etc.
  • a lamp base comprising a metallic base shell having an annular flange with a relatively smooth inner surface, insulating means secured to the base shell, and base pin or contact means mounted on the insulating means for connection to a source of power.
  • the inner diameter of the annular flange is such that when the base shell is heated prior to fitting of the annular flange over the end portion the diameter of the annular flange increases to an expanded diameter. After the annular flange is cooled following fitting, the annular flange forms an interference fit with the end portion so as to retain the lamp base on the end portion in a cement-free manner.
  • the annular flange includes an annular rib on the inner surface thereof.
  • the inner diameter of the annular rib is such that when the annular flange is heated prior to fitting of the annular flange over the end portion, the inner diameter of the annular rib increases to an expanded diameter. After the annular flange is cooled following fitting, the annular rib forms an interference fit with the end portion so as to retain the lamp base on the end portion in a cement-free manner.
  • the method comprises the steps of providing an hermetically sealed glass envelope having at least one end portion which includes an annular groove and a terminating annular seal; providing a lamp base comprising a metallic base shell having an annular flange with an inner surface, insulating means secured to the base shell, and base pin or contact means mounted on the insulating means; heating the annular flange to a predetermined temperature so as to increase the predetermined minimum diameter of the annular flange to an expanded diameter; thereafter, fitting the annular flange over the end portion; and cooling the annular flange so that the inner surface thereof forms an interference fit with the end portion so as to retain the lamp base on the end portion in a cement-free manner.
  • the method for manufacturing the lamp includes the step of forming an annular rib on the inner surface of the annular flange and fitting the annular flange over the end portion so that the annular rib is adjacent to the annular groove and the annular seal.
  • FIGS. 1 and 2 there is shown in FIGS. 1 and 2 a lamp 10 (i.e., a fluorescent tube) comprising a tubular vitreous or glass envelope 12 that is provided with an inner coating of phosphor 14 and is hermetically sealed at each end by a glass mount 16.
  • Each mount 16 includes a stem press 18 within which a pair of lead wires 20 are sealed.
  • a thermionic electrode 22 is mounted on the inner ends of lead wires 20 within the tubular glass envelope 12.
  • Each thermionic electrode 22 comprises a tungsten coil coated with an emissive material of alkaline earth oxides.
  • the envelope 12 is filled with a suitable starting gas and also doped with mercury to provide an ionizable medium within the sealed envelope which permits an electric discharge to pass between the thermionic electrodes.
  • each of the end portions of the lamp envelope 12 includes an annular groove 34 which terminates at an annular rim or seal 38, in the form of a bead, which has a diameter D S .
  • Each of the sealed end portions of envelope 12 are fitted with a base 30 that includes a pair of axially-extending metal base pins 32 or other form of contacts which serve as terminals for the lamp 10 and are adapted, by virtue of their spacing and dimensions, to permit the lamp to be inserted into the socket components of a lighting fixture and be operated from a suitable electrical power supply.
  • Each lead wire 20 extends through a stem press 18 in mount 16 to a respective metal base pin 32.
  • Base 30 includes a metallic base shell 42 having a circumferential annular flange 44 with an inner diameter D F .
  • Annular flange 44 which extends axially, has a relatively smooth inner surface 40 in the embodiment of FIG. 2.
  • Surface 40 in FIG. 2 is smooth in the sense that this surface is free of any bumps or other protrusions.
  • Base shell 42 is formed of a suitable metal such as aluminium, which has a modulus of elasticity which is between 6.32 x 10 5 kg/cm 2 and 4.03 x 10 6 kg/cm 2 . Aluminium has a breaking dilation of 14% minimum and a melting temperature of 660° Celsius.
  • An oval-shaped disc 46 of insulating material is secured to base shell 42.
  • a pair of base pins 32 are received in registering apertures formed in the insulating disc 46.
  • each of the base pins 32 are provided with an upset collar portion 48 engaging the lower surface of disc 46 and having their inner ends swaged or riveted into contact with the upper surface of disc 46, in the region of apertures in the shell 42, thus rigidly securing the pins in position whilst insulating them from shell 42.
  • each base pin may be mounted on separate insulating disks.
  • the inner diameter D F of the annular flange 44 prior to fitting over the lamp end portion is slightly smaller than the annular seal diameter D S .
  • the annular flange 44 is heated to a temperature of, for example, 260°C to 315°C.
  • the inner diameter D F of the annular flange 44 increases to an expanded diameter and allows the annular flange 44 to easily slide over the annular seal 38.
  • annular flange 44 of the base shell 42 is allowed to cool, whereupon annular flange 44 contracts to its initial diameter D F causing formation of an interference fit between the inner surface 40 of annular flange 44 and the annular seal 38. It has been discovered that this interference fit alone is sufficient to secure the lamp base to the lamp end portion. Bases fitted in this manner have passed prescribed torsion tests. No cements, glues or other adhesives were needed.
  • the base of FIG. 2 is particularly suited to lamps wherein the shape of the annular seal and, more particularly, the outer diameter is precisely controlled as is the case where the annular seal is formed in a moulded-type operation.
  • the lamp included a tubular glass envelope having an outer diameter of 3.744 cm.
  • One of the lamp end portions contains an annular seal having an outer diameter of 3.423 cm.
  • the base includes an aluminium base shell having an annular flange with an inner diameter (at room temperature and prior to fitting) of 3.399 cm.
  • the annular flange is heated to a temperature of 288°C whereupon the inner diameter of the annular flange increased to 3.419 cm. Thereafter, the heated annular flange is fitted over the end portion of the lamp and allowed to cool. Upon cooling, the inner surface of the annular flange contacted the annular lamp seal and forms an interference fit.
  • FIG. 3 there is shown a lamp base 30' according to another embodiment of the present invention, wherein similar constituent members as those in FIG. 2 are denoted by the same reference numerals.
  • the annular flange 44 includes a groove or channel 50 formed in its outer surface which provides an annular rib 52 on the inner surface.
  • Groove 50 may be formed by placing the base on a split, spring-loaded mandrel having an annular groove.
  • the annular groove in the mandrel has a depth equal to the maximum intended height of annular rib.
  • a clamshell clamp with a tooth corresponding to the maximum rib height contacts the annular flange at the intersection of the tooth and the annular groove formed in the mandrel.
  • the depth of the groove formed in the base flange (and consequently the height of the annular rib in the base flange) is controlled by a force gauge or a linear distance sensor.
  • the groove and annular rib in the base flange may be formed manually by using a hand tool with a tooth formed in one leg.
  • the radius of the tooth is equal to the outer diameter of the base flange.
  • a groove formed in the other leg of the tool to receive the tooth has the desired shape of the annular rib.
  • the cross-sectional shape of the annular rib 52 may be varied.
  • the cross-sectional shape of rib 52 may be square (FIG. 4A), triangular (FIGS. 3 and 4B) or have a leading edge 62 tapered at approximately 45° with respect to the base flange to assist fitting (FIG. 4C). Varying the cross-sectional shape of the annular rib 52 may result in reduced fitting force and additional retention and anti-rotation forces.
  • the inner diameter D R of the annular rib 52 prior to fitting over the lamp end portion is slightly smaller than the annular seal diameter D S .
  • the annular flange 44 is heated to a temperature of, for example, 260°C to 315°C.
  • the inner diameter D R of the annular rib 52 increases to an expanded diameter which allows the annular rib 52 to slide over the annular seal 38 and into annular groove 34 adjacent to annular seal 38.
  • the end portion of the lamp may be at room temperature or at an elevated temperature during base fitting.
  • annular flange 44 of the base shell 42 is allowed to cool, whereupon annular rib 52 forms an interference fit with the lamp end portion.
  • Bases fitted in this manner have passed prescribed torsion tests without the need for cement, glue or other form of adhesive.
  • the following Table illustrates typical rib dimensions for various lamp seal diameters D S .
  • the inner diameter D R of the annular rib is shown at 25°C and 288°C.
  • the inner diameter D F of the annular flange measured prior to the formation of the annular rib is equal to approximately 3.399 cm.
  • Rib height in the second column is equal to (D F -D R )/ 2 .
  • changes to the height and/or shape of the annular rib may be made by the use of supplemental jaws containing a tooth.
  • the circumferential radius of the jaws should approximate to the smallest dimension of the annular groove in the base shell.
  • Sufficient pressure is applied on the base shell by the jaws to deepen or reshape the existing annular groove and further force the annular rib against the lamp end portion.
  • Such changes to the annular rib after base fitting further increases retention and anti-rotation forces.
  • the base can easily be secured to the lamp end without the need for basing cement or other type of adhesive.
  • the base can be used without the need for special notching of the bulb neck in order to prevent rotary movement of the base relative to the bulb.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (9)

  1. Lampe (10) comprenant une ampoule (12) ayant une partie d'extrémité sur laquelle est scellé un culot (30) de lampe, la partie d'extrémité ayant un scellement annulaire (38) et le culot (30) de lampe incluant une chemise (42) ayant une partie annulaire (40; 52) qui est en contact avec le scellement annulaire (38) de manière à maintenir le culot (30) de lampe sur l'ampoule (12) dans une condition de scellement, la chemise (42) ayant été chauffée pour faciliter un contact de la partie annulaire (40; 52) sur le scellement (38), puis, ensuite, refroidie pour obtenir un ajustement interactif avec le scellement (38),
    caractérisée en ce que la chemise est dans un matériau métallique.
  2. Lampe selon la revendication 1, caractérisée en ce que la chemise (42) du culot est en aluminium.
  3. Lampe selon la revendication 1 ou 2, caractérisée en ce que le scellement (38) sur la partie d'extrémité de l'ampoule (12) affecte la forme d'une perle annulaire.
  4. Lampe selon la revendication 3, caractérisée en ce que la perle annulaire est reliée au reste de l'ampoule (12) par une gorge annulaire (34).
  5. Lampe selon l'une quelconque des revendications précédentes, caractérisée en ce que la partie annulaire (40) de la chemise (42) est une paroi intérieure relativement lisse (40) d'une collerette (44) faisant saillie axialement.
  6. Lampe selon l'une quelconque des revendications précédentes, caractérisée en ce que la partie annulaire (52) de la chemise (42) est une nervure (52) dirigée vers l'intérieur sur une collerette (44) faisant saillie axialement, laquelle nervure (52) pénètre dans une gorge (34) dans la partie d'extrémité de l'ampoule (12).
  7. Lampe selon la revendication 6, caractérisée en ce que le bord d'alignement (62) de la nervure (52) est conique.
  8. Procédé de fabrication d'une lampe selon l'une quelconque des revendications précédentes, caractérisé en ce que la chemise métallique (42) est chauffée à une température dans une gamme comprise entre 260 °C et 315 °C pour permettre à la partie annulaire (40; 52) d'augmenter en diamètre, disposée sur le scellement (38), puis refroidie.
  9. Procédé de fabrication d'une lampe selon la revendication 6 ou 7, caractérisé en ce que, après que la chemise métallique (42) ait été chauffée et disposée sur le scellement (38), la nervure (52) pénétrant dans la gorge (34), la nervure (52) est ensuite pressée dans la gorge (34).
EP19930307639 1992-09-25 1993-09-27 Lampe électrique Expired - Lifetime EP0589730B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US951509 1992-09-25
US951521 1992-09-25
US07/951,521 US5432400A (en) 1992-09-25 1992-09-25 Lamp having interference-fit metallic bases
US07/951,509 US5254025A (en) 1992-09-25 1992-09-25 Method for manufacturing lamp having interference-fit metallic bases

Publications (2)

Publication Number Publication Date
EP0589730A1 EP0589730A1 (fr) 1994-03-30
EP0589730B1 true EP0589730B1 (fr) 1996-12-04

Family

ID=27130316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930307639 Expired - Lifetime EP0589730B1 (fr) 1992-09-25 1993-09-27 Lampe électrique

Country Status (2)

Country Link
EP (1) EP0589730B1 (fr)
DE (1) DE69306348T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007046345A1 (de) * 2007-09-27 2009-04-02 Osram Gesellschaft mit beschränkter Haftung Entladungslampe mit einem Gehäuse und einem Entladungsgefäß
DE102016207026B4 (de) * 2016-04-26 2022-05-12 Ledvance Gmbh Herstellen einer Lampe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221453A (en) * 1978-07-12 1980-09-09 Fritz Wagener Gmbh Fluorescent tube with socket capping
GB8400259D0 (en) * 1984-01-06 1984-02-08 Gen Electric Co Plc Electric lamp and cap
US5013962A (en) * 1989-12-26 1991-05-07 Gte Products Corporation Single pin lamp base and fluorescent lamp including same

Also Published As

Publication number Publication date
DE69306348T2 (de) 1997-06-19
DE69306348D1 (de) 1997-01-16
EP0589730A1 (fr) 1994-03-30

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