EP0101257B1 - Douille pour ampoule - Google Patents

Douille pour ampoule Download PDF

Info

Publication number
EP0101257B1
EP0101257B1 EP83304504A EP83304504A EP0101257B1 EP 0101257 B1 EP0101257 B1 EP 0101257B1 EP 83304504 A EP83304504 A EP 83304504A EP 83304504 A EP83304504 A EP 83304504A EP 0101257 B1 EP0101257 B1 EP 0101257B1
Authority
EP
European Patent Office
Prior art keywords
carrier
housing
bulb
pin
socket
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
Application number
EP83304504A
Other languages
German (de)
English (en)
Other versions
EP0101257A1 (fr
Inventor
Patrick John Doherty
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.)
KUDOS LIGHTING LIMITED
Original Assignee
KUDOS LIGHTING Ltd
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 GB838304347A external-priority patent/GB8304347D0/en
Priority claimed from GB838306273A external-priority patent/GB8306273D0/en
Priority claimed from GB838307733A external-priority patent/GB8307733D0/en
Priority claimed from GB838312225A external-priority patent/GB8312225D0/en
Application filed by KUDOS LIGHTING Ltd filed Critical KUDOS LIGHTING Ltd
Priority to AT83304504T priority Critical patent/ATE27514T1/de
Publication of EP0101257A1 publication Critical patent/EP0101257A1/fr
Application granted granted Critical
Publication of EP0101257B1 publication Critical patent/EP0101257B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/945—Holders with built-in electrical component
    • H01R33/96—Holders with built-in electrical component with switch operated by engagement or disengagement of coupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/945—Holders with built-in electrical component
    • H01R33/96—Holders with built-in electrical component with switch operated by engagement or disengagement of coupling
    • H01R33/962—Holders with built-in electrical component with switch operated by engagement or disengagement of coupling for screw type coupling devices

Definitions

  • the present invention relates to safety lampholders.
  • Conventional lampholders comprise a body supporting fixed terminals to which electrical cables are connected, the body defining a socket into which a lamp bulb is in use inserted.
  • Contacts often in the form of resiliently mounted pins are exposed within the socket to contact an inserted bulb, the contacts being permanently electrically connected to the fixed terminals.
  • Conventional three pin socket outlets into which cable terminating plugs are inserted generally have their live and neutral terminals covered by a shutter, the shutter being pulled away when an earth pin of a plug is inserted into the earth terminal socket.
  • Such socket outlets are relatively safe as if one is to electrically contact the live terminal a pin must first be inserted into the earth terminal socket and then a further pin must be inserted into the live terminal socket.
  • conventional lampholders not only are the live and neutral terminals not protected by a shutter but also the common socket in which they are located is large enough to enable a finger to be inserted.
  • one or both of the contact pins are spring mounted in the lampholder body so that unless they are pushed up from within the socket in an axial direction relative to the socket they do not contact the cable terminals.
  • the spring force applied to the contacts is large the contacts can be easily pushed up with a finger.
  • the spring force is large it becomes difficult to insert a bulb into the socket, and even more difficult to remove a bulb as the contacts tend to become embedded in the soft lead provided in at least one terminal of conventional bulbs. Damage to the bulb can result and the lampholderfeels far to tight.
  • An example of such a lampholder is to be seen in US-A-:-2 306 741.
  • a safety lampholder comprising a housing defining a socket into which in use a lamp bulb is inserted in an axial direction relative to the socket, fixed cable terminals supported by the housing and to which in use power supply cables are connected, contacts accessible within the socket for making electrical connections with an inserted bulb, a carrier mounted in the housing and supporting at least a part of each of the contacts, the carrier being movable as a result of insertion of a bulb between a first position in which the contacts are isolated from the terminals and a second position in which the contacts are electrically connected to the terminals, and means to bias the carrier to the first position in the absence of a bulb, wherein the carrier is engaged by at least one pin which bears against an inserted bulb and moves axially with it relative to the housing as the bulb is inserted into or removed from the housing, said at least one pin being located adjacent a wall of the socket so that an inerted finger cannot exert a substantial axial force upon it, and wherein said at least one pin, said carrier and said
  • the or each pin As the or each pin is located adjacent the wall of the socket it engages only the outer periphery of an inserted bulb and this makes it extremely difficult to move the pin axially without using a tool to engage the pin.tip.
  • the spring force which must be overcome can be relatively small. The lampholder is thus easy to use and does not feel stiff to the user.
  • the carrier may be freely accessible within the socket.
  • FIG. 1 an embodiment is illustrated in which the carrier is freely accessible to an inserted finger. Movement of the carrier is prevented unless two pins extending along the socket wall are pushed in an axial dirction. The pins cannot be pushed by an inserted finger as a result of it being difficult to engage the pins with ones finger.
  • the lampholder of Fig. 1 comprises a single piece housing 20 supporting fixed terminals 21, 22 and receiving a carrier 23 which is force fitted by pushing it over an internal flange 24.
  • the carrier supports spring contacts 25 arranged to make electrical connections with the terminals 21, 22 when the carrier is moved towards the terminals.
  • the carrier is generally circular when viewed from the socket but is provided with two oppositely arranged lugs 26, 27 which in the position shown engage in an annular groove 28 located between the flange 24 and a thickened portion 29 of the housing 20.
  • Two axially extending grooves (not shown) communicate with the groove 28 and when the lugs are aligned with these axial grooves the carrier can move towards the terminals 21, 22.
  • a latch comprising a central portion 30 extending across and above the carrier between the contacts 25 and two pins 31 (only one of which is shown) extending through peripheral slots 32 in the carrier and along slots (not shown) in the inside wall of the socket.
  • Each slot 32 has an inclined edge surface 33 which engages a similarly inclined edge of the respective pin.
  • a spring 34 bears against the central portion 30 of the latch.
  • the carrier cannot rotate relative to the housing because of the presence of the pins and their engagement with the socket wall, and the carrier cannot be moved axially because the lugs 26, 27 bear against the thickened portion 29 of the housing wall.
  • a bulb When a bulb is inserted, its end engages the tips of the latch pins 31 pushing them upwards against the spring 34.
  • the inclined portions of the pins slide against the corresponding inclined portions 33 of the carrier, causing it to rotate. This rotation aligns the lugs 26, 27 with the axial grooves so that when the bulb terminals engage the contacts 25 the carrier 23 is pushed towards the terminals 21, 22 to make electrical connections between the terminals and contacts.
  • Figs. 2 to 15 a further embodiment of the invention will be described.
  • the principle of operation of this embodiment is similar to that of the embodiment of Fig. 1 but its constructional detail differs in several respects.
  • Fig. 2 schematically illustrates the lampholder housing 35 which supports fixed spring strip terminals 36 and a carrier 37 which supports spring strip contacts 38.
  • the carrier initially rotates to move the contact 38 shown in Fig. 2 to the right and thereafter the carrier moves towards the terminal 36 to make sliding contact between the terminal 36 and the contact 38.
  • the carrier supports two axially extending arms 39.
  • the latch member which causes the carrier to rotate is not shown in Fig. 2.
  • Figs. 3 to 6 illustrate the housing 35 of Fig. 2 in detail, Figs. 3 and 4 being respectively top and bottom views taken on lines 3-3 and " of Fig. 2, and Figs. 5 and 6 being axial sections taken on lines 5-5 and 6-6 of Fig. 3.
  • the terminals 36 of Fig. 2 are inserted through apertures 40 (Figs. 3 and 4), wires being fed to the terminals radially from a position on the housing axis, beneath lugs 41, and into through holes 42.
  • the housing defines conventional bayonet slots 43, axial slots 44 arranged on opposite sides of the housing, and axial keyways 45 also arranged on opposite sides of the housing.
  • the inside of the housing also defines recessed areas 46.
  • Figs. 7 and 8 illustrate the lampholder cap, the cap being provided with apertures 47 which engage over lugs 48 (Fig. 5) such that the cap is a snap fit on the housing. Keyways 49 cooperate with grooves 50 (Fig. 3) to ensure correct orientation of the cap on the housing.
  • Figs. 9 and 10 illustrate the carrier 37 previously shown in Fig. 2 and its arms 39.
  • the carrier is provided with two slots 51 with inclined edges 52, 53, two slots 54 immediately adjacent respective arms 39, and two slots 55 to receive the terminals 38 (Fig. 2).
  • the inclined edges 53 are provided on projections 56.
  • the arms 39 are resilient and support hooks 57 on their ends.
  • the latch comprises a central portion 58 supporting a pin 59 and two end portions or pins 60 defining inclined surfaces 61.
  • the latch comprises a central portion 58 supporting a pin 59 and two end portions or pins 60 defining inclined surfaces 61.
  • the carrier contact 38 and fixed terminal 36 are illustrated.
  • the carrier contact comprises a central apertured portion 62 which when the pin is mounted in the carrier is located within the slot 55 (Fig. 9), the slot being shaped such that the contact aperture is positively engaged.
  • the contact is thus a simple push in fit.
  • the fixed contact 36 comprises an aperture having a first portion 63 of circular cross section larger than the diameter of an insulated wire to which it is to make a connection and a second portion 64 in the form of a slot the width of which is less than the diameter of the conductor wire.
  • the head of the terminal supports a flange 65. In use, the terminal is pushed into the slot 40 (Fig. 3) until the circular aperture 63 is aligned with the through holes 42 (Fig. 5).
  • the unstripped wire is then pushed through the terminal so that its end is located in the hole 42.
  • the terminal is then pushed fully in so that the flange 65 engages in a slot 66 shown in outline in Figs. 3, 5 and 6.
  • This final movement of the terminal secures it in position and also simultaneously forces the conductor wire into the terminal slot 64, the edges of the slot cutting through the wire insulation. Pre-stripping of thee wire insulation is thus not necessary.
  • the terminals 36 are pushed partially into the housing and the contacts 38 are pushed fully into the carrier as described above.
  • the latch pins 60 are located in the carrier slots 51 and a compression spring is placed over the latch pin 59.
  • This sub assembly is then pushed into the housing with the latch engaging slots 44 until the carrier hooks 57 snap into the housing recesses 46.
  • a cable is then passed through the cap and secured to the terminals, and the cap is snapped onto the housing. The lampholder is then complete.
  • the carrier If an attempt is made to push the carrier towards the terminals with a finger, the carrier is prevented from moving as it comes into contact with the keyways 45. If a bulb is inserted, the latch pins are engaged and the latch moves axially. The cooperating inclined surfaces 52, 53 and 61 of the latch and carrier cause the carrier to rotate until the keyways 45 are aligned with the slots 54, whereafter the carrier is pushed into the housing until the terminals 36 engage the contacts 38.
  • switch devices may be incorporated in the lampholders if so required.
  • the described embodiments may be easily adapted to accommodate screw-type bulbs. If the lampholder has the structure of Figs. 2 to 15 but is adapted for a screw type bulb, the pins which extend along the socket wall can be recessed in grooves so that they do not protrude above the lampholder screw thread. Thus only a bulb which engages in the screw thread can engage the tips of the pins.
  • Figs. 2 to 15 has a snap-on cap.
  • the head of the lampholder housing can be extended to define a tube through which the supply cable runs.
  • a bore communicates with the tube and a screw which extends through and engages a thread in the lampholder cap engages in the bore. The screw thus secures the cap in position and when tightened traps the cable within the tube to prevent it from being pulled out accidentally.
  • the above lampholder safety mechanisms can be provided in an adaptor which can be fixed to a conventional lampholder.
  • An adaptor of this type could prove useful where the purchaser does not want to remove existing lampholders and wire in new ones.
  • the adaptor could have a structure such that it locks onto the spring mounted contacts in the conventional lampholder as a result of these contacts engaging in suitable recesses. The adaptor could not then be removed accidentally.
  • the bayonet pin of the adaptor could be made removable however so that the adaptor could be removed using a pair of pliers if so desired.
  • rotation of the carrier is achieved by cooperating faces of the latch and carrier sliding relative to each other.
  • it is possible to cause or assist rotation by providing suitable slotted members secured to the carrier, the bulb bayonet pins engaging the slotted members as the bulb is inserted.

Landscapes

  • Fastening Of Light Sources Or Lamp Holders (AREA)

Claims (11)

1. Douille de lampe de sécurité comprenant un cadre (20, 35) définissant une douille dans laquelle une ampoule est insérée on direction axiale par rapport à la douille, des bornes d'extrê- mités de câble fixes (21, 22, 36) portées par le câble et auxquelles des câbles d'alimentation électrique sont raccordés en utilisation, des contacts (25, 38) accessibles à l'intérieur de la douille pour établir des connexions électriques avec une ampoule insérée, un support (23, 37) monté dans le cadre et portant au moins une partie de chacun des contacts, le support étant mobile par suite de l'insertion d'une ampoule entre une première position dans laquelle les contacts sont isolés des bornes d'extrémités et une seconde position dans laquelle les contacts sont connectés électriquement aux bornes d'ex- trêmités, et un moyen (34) pour incliner le support vers la première position en l'absence d'ampoule, caractérisé en ce que le support est engagé par au moins une broche (31-, 60) qui s'appuie contre une ampoule insérée et se déplace axialement avec l'ampoule par rapport au cadre, lorsque l'ampoule est insérée dans le cadre ou lorsque l'ampoule est enlevée du cadre, la broche étant disposée de façon adjacente à une paroi de la douille de façon qu'un doigt inséré ne puisse pas exercer une force axiale substantielle sur cette paroi, et en ce que la broche, le support et le cadre sont conçus sous une forme telle que le mouvement du support entre les première et seconde positione nécessite une rotation du support par rapport au cadre et qu'une telle insertion de l'ampoule dans la douille produise un déplacement de la broche par contact avec l'ampoule, de façon à provoquer la rotation du support.
2. Douille de sécurité selon la revendication 1, caractérisée en ce que le support est directement accessible à l'intérieur de la douille et que chaque contact est porté entièrement par le support.
3. Douille de sécurité selon la revendication 1, caractérisée en ce que la broche (31, 60) est déplaçable axialement par rapport au support, le support et la broche ayant des surfaces coopérantes (33, 52, 53, 61) telles que le mouvement axial de la broche provoque la rotation du support par rapport au cadre, le support ne pouvant entrer en rotation sans un mouvement axial relatif de la broche.
4. Douille de sécurité selon la revendication 3, caractérisée en ce que le déplacement du support de la première position dans la seconde position exige d'abord la rotation du support par rapport au cadre et ensuite le mouvement axiale du support par rapport au cadre, le mouvement axial du support avant la rotation étant empêché par les surfaces coopérantes (26, 27, 29, 45) du support et du cadre.
5. Douille de sécurité selon la revendication 1, comprenant deux broches espacées entre elles (31, 60).
6. Douille de sécurité selon la revendication 5, caractérisée en ce que les broches sont portées par un organe de verrouillage (30, 58), l'organe de verrouillage étant engagé dans des rainures axiales à l'intérieur du cadre pour empêcher la rotation par rapport à celui-ci.
7. Douille de sécurité selon la revendication 2, caractérisés en ce que le support (37) porte deux branches (39) dont les extrémités définissent des organes de crochet (57), les organes de crochet étant engagés dans des cavités définies par le cadre pour maintenir le support à l'intérieur de celui-ci.
8. Douille de sécurité selon la revendication 1, caractérisée en ce que chaque borne d'extrémité fixe (36) comprend une bande de ressort insérée à travers une ouverture du cadre.
9. Douille de sécurité selon la revendication 8, caractérisée en ce que chaque bande de ressort (36) d'extrémité comprend une ouverture circulaire (63) communiquant avec une fente (64), et que le cadre définit un vrai trou placé de façon qu'un fil isolé puisse être inséré à travers l'ouverture dans le trou et que la borne d'extrémité puisse alors être pressée vers le bas pour forcer le fil à pénétrer dans la fente, en coupant ainsi à travers l'isolation pour réaliser le contact électrique avec le fil.
10. Douille de sécurité selon la revendication 1, caractérisée en ce que chaque contact (38) comprend une bande de ressorts inséré à travers une outervure dans le support.
11. Douille de sécurité selon la revendication 1, caractérisée en ce que le moyen d'inclinaison comprend un ressort de compression disposé suivant l'axe de la douille et s'appuyant par au moins une extrémité contre le cadre de la douille et par l'autre extrêmité, directement ou indirectement sur le support.
EP83304504A 1982-08-09 1983-08-04 Douille pour ampoule Expired EP0101257B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83304504T ATE27514T1 (de) 1982-08-09 1983-08-04 Lampenfassung.

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
GB8222857 1982-08-09
GB8222857 1982-08-09
GB8223467 1982-08-16
GB8223467 1982-08-16
GB8226970 1982-09-21
GB8226970 1982-09-21
GB8235840 1982-12-16
GB8235840 1982-12-16
GB838304347A GB8304347D0 (en) 1982-08-16 1983-02-17 Lampholder
GB8304347 1983-02-17
GB8306273 1983-03-07
GB838306273A GB8306273D0 (en) 1982-08-09 1983-03-07 Safety lampholder
GB8307733 1983-03-21
GB838307733A GB8307733D0 (en) 1982-08-09 1983-03-21 Lampholder
GB8312225 1983-05-04
GB838312225A GB8312225D0 (en) 1983-05-04 1983-05-04 Lampholder

Publications (2)

Publication Number Publication Date
EP0101257A1 EP0101257A1 (fr) 1984-02-22
EP0101257B1 true EP0101257B1 (fr) 1987-05-27

Family

ID=27571213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304504A Expired EP0101257B1 (fr) 1982-08-09 1983-08-04 Douille pour ampoule

Country Status (5)

Country Link
EP (1) EP0101257B1 (fr)
JP (1) JPS59501807A (fr)
AU (1) AU575536B2 (fr)
DE (1) DE3371840D1 (fr)
WO (1) WO1984000854A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8431950D0 (en) * 1984-12-18 1985-01-30 Willis C T Electrical socket
GB8823666D0 (en) * 1988-10-08 1988-11-16 Ranton & Co Ltd Protected lampholder
US7731545B1 (en) 2009-02-25 2010-06-08 Osram Sylvania Inc. Lamp socket and contact for said socket

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306741A (en) * 1940-09-26 1942-12-29 Roy G Miller Shockproof electric receptacle
FR2045036A5 (fr) * 1969-05-30 1971-02-26 Bonnet Robert
SE388731B (sv) * 1972-02-23 1976-10-11 Hellzen O B A Hallare for en elektrisk lampa
US4222623A (en) * 1978-07-26 1980-09-16 Tore Hultberg Glow-lamp holder
FR2466114A1 (fr) * 1979-09-19 1981-03-27 Bonnet Robert Douille electrique de securite a vis edison
IE49506B1 (en) * 1980-01-31 1985-10-16 Paul Anderson Electrical sockets for electrical devices
AU7785881A (en) * 1980-11-27 1982-06-03 Park Royal Porcelain Co. Ltd. Electrical sockets

Also Published As

Publication number Publication date
JPS59501807A (ja) 1984-10-25
DE3371840D1 (en) 1987-07-02
AU1825483A (en) 1984-03-07
AU575536B2 (en) 1988-08-04
WO1984000854A1 (fr) 1984-03-01
EP0101257A1 (fr) 1984-02-22

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