EP0053488A1 - Elektrische Steckfassung - Google Patents

Elektrische Steckfassung Download PDF

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Publication number
EP0053488A1
EP0053488A1 EP81305601A EP81305601A EP0053488A1 EP 0053488 A1 EP0053488 A1 EP 0053488A1 EP 81305601 A EP81305601 A EP 81305601A EP 81305601 A EP81305601 A EP 81305601A EP 0053488 A1 EP0053488 A1 EP 0053488A1
Authority
EP
European Patent Office
Prior art keywords
contact
socket
conductor
slot
plug
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.)
Withdrawn
Application number
EP81305601A
Other languages
English (en)
French (fr)
Inventor
Michael Scott-Coomber
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.)
PARK ROYAL PORCELAIN Co Ltd
Original Assignee
PARK ROYAL PORCELAIN Co 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
Application filed by PARK ROYAL PORCELAIN Co Ltd filed Critical PARK ROYAL PORCELAIN Co Ltd
Publication of EP0053488A1 publication Critical patent/EP0053488A1/de
Withdrawn legal-status Critical Current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
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
    • H01R13/42—Securing in a demountable manner
    • H01R13/422—Securing in resilient one-piece base or case, e.g. by friction; One-piece base or case formed with resilient locking means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
    • H01R13/42—Securing in a demountable manner
    • H01R13/428—Securing in a demountable manner by resilient locking means on the contact members; by locking means on resilient contact members
    • 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
    • H01R33/05—Two-pole devices
    • H01R33/46—Two-pole devices for bayonet type base

Definitions

  • the invention relates to electrical sockets and inserts therefor. It is described chiefly in relation to B.C. (bayonet-cap) lamp holders but is not restricted to them being useful in E.S. (Edison-screw) lamp holders for example.
  • the assembled sockets having i) a body with an upward facing aperture for reception of a plug ii) one or more axial bores or slots in an insulating portion of the body or insert which or each of which is for reception from above of a corresponding contact iii) correspondingly, one or more conductor-receiving bores or slots in the insulating portion each intersecting or constituted by a said axial bore and wherein iv) the or each contact has a spring finger shaped to extend within said aperture to engage an inserted plug, and a portion shaped to resiliently engage and be retained in the said insulating portion and to receive a corresponding conductor.
  • Such a construction is readily adopted in single or double contact lampholders suitable as direct replacements for existing domestic designs, satisfying standards for current carrying capacity, clearances and the like. It can moreover consist of parts very economical to produce and assemble, for example in all-ceramic lampholders, or the well known type in which an insulating insert is received in a metal casing forming the 'body' above.
  • a contact may be received in the insulating portion by simple frictional engagement but is preferably shaped so that in the assembled socket a projecting tang or the like on the retaining portion of the contact engages below a downwardly directed face or abutment formed in insulating portion.
  • a tang may engage by snap action or may be held in engagement indirectly by another portion of the contact flexed on insertion.
  • Such other portion may in particular have the further function of resiliently retaining a conductor inserted between it and the insulating portion, or alternatively, a tang having this function alone may be present.
  • a guillotine slot formed in the retaining portion of the respective contact, that is to say a slot of such a width that the insulation of the conductor is cut at opposing points when conductor and slot engage, and the conductor itself is held firmly but without damage in the slot.
  • a socket or insert of this kind is readily made for prewiring, or wiring simultaneously with assembly, the or each contact engaging the conductor as it is inserted.
  • Lampholders and inserts for use in them, so wired, are the subject of our published United Kingdom Patent Application No. 2 052 888 A, though of course the contact strips there have not the flexibility that is required in a B.C. holder nor do they resiliently engage the body of the holder.
  • the present invention therefore seeks to avoid this difficulty by using different metal thicknesses for the spring finger and the guillotine slotted portion whilst at the same time not making assembly more difficult.
  • this is achieved by having a two-part contact, one part being thinner and providing the spring finger, and the other part being thicker and having in it the guillotine slot. It is usually convenient for the two parts to be made separated, being adapted to be received in a common bore or slot in the insulating portion in a manner maintaining electrical contact between the two parts.
  • the spring part may for instance be of spring steel and the thicker guillotine part of phosphor bronze.
  • the new constructions may be applied in simple holders but are particularly adapted to safety holders having a plug-receiving sleeve within the socket body, rotated by a fully inserted plug between a safe position at which supply contacts in the holder (constituted by spring fingers as above) are inaccessible and are circumferentially separated from plug contacts associated with the sleeve, and a live position at which electrical connection of the supply contacts with the plug contacts is made.
  • the plug contacts are carried by an insulating shutter moving with the sleeve, the spring fingers lying below the shutter for contact with the plug contacts in the live position.
  • the present invention may be applied to such a socket, two spring fingers as above lying below the shutter to constitute the supply contacts. In the above constructions engagement of the contacts of the present invention with the plug is thus indirect.
  • Fig. 1 the base of a B.C. lamp is shown above a holder which has a body 1, moulded in conventional ceramic material, with bayonet slots 2.
  • Axial contact- receiving bores generally indicated at 8 (Fig. 3) have narrow locating portions 9 (Fig. 2) extending into the body from above to receive wings 10 (Figs. 1 and 3) of the contact strips.
  • Fig. 4 The alternative contact strips shown in Fig. 4 are represented in an outline of the upper part of the holder of Figs. 1 to 3, Fig. 4a shows a design where the contact finger returns on itself to provide greater travel, the body being hollowed out at 21 in a slot giving lateral location; Fig. 4b a dog leg extension 22 of the contact finger to give greater length of flexure; and Fig. 4c a similar dog leg together with a coil spring 23 to improve location and give greater contact pressure than may conveniently be available from a spring strip alone. This coil spring enters the bore 24 in the holder body and is located above by a retainer tang 25.
  • the retaining portion seen in Fig. 5 is similar to that of Figs. 1 to 3, having tangs 12' and 15', the former engaging below a face 13' and the latter holding a conductor 16'.
  • the corresponding tangs in Figs. 6 and 7 are respectively referenced as 12", 12"' and 15", 15"'; tangs 12", 15" and 15"' are pressed out of the body of the contact strip and tang 12"' is constituted by a folded end of the contact strip.
  • a safety version of the holder is shown in which the body is divided into two parts, a lower part corresponding to that of Figs. 1 to 3 but without the plug-receiving socket, and an upper part 106 received on a shoulder 114 of the lower part 115, which is otherwise referenced as before.
  • the upper part has a bayonet pin entry 108 and circumferential slot 108'. It receives a sleeve 105 and a shutter 103 which lies over the contacts of the lower part.
  • the shutter has two conductive studs 104 passing through it giving electrical connection between the contact pads of a lamp and the spring contact strips 7 when the shutter is appropriately oriented (as seen in Fig. 8 it is in the 'off' position).
  • Notches 109 in the upper edge of the sleeve allow entry of the bayonet pins and ensure that the sleeve is carried round as the lamp is inserted and moved to the 'on' or contact position.
  • the sleeve in turn moves the shutter by engagement of projections 113 on the shutter in notches 112 in the base of the sleeve.
  • the shutter is free to move axially over a sufficient distance to accommodate the "in, twist and return" action of the lamp in the bayonet slots, and rides on the spring fingers, as indicated by arrows, from the 'off' position at which the studs 104 are clear of the spring fingers, to the 'on' position at which they contact the portions 6 and complete the electrical connection.
  • Positive end positions are given by projections 111 on the upper body (one of which is seen in the Fig.) engaging 'off' notches 110 and 'on' notches 110' in the upper edge of the sleeve, the pressure of the spring fingers ensuring engagement.
  • Fig. 9 The construction of Fig. 9 needs little description, the insert 201 snapping into a male-threaded 'candle' holder 202 and being otherwise as shown in detail in the lower body 115 of Fig.8.
  • a body 301 having a transverse slot 302 to receive a conductor 303 against faces 304 and 305. It is held there by a guillotine contact strip 306 having arms 307, which arms pass over the conductor and are received in slots 308 in the body 301. As it reaches its fully inserted position the contact strip cuts the insulation of the conductor by the action of shoulders 309, and the narrow portion 310 of the guillotine slot enters firm electrical contact with the metallic part of the conductor. At the same time bent portions 311 of the arms 307, flattened during insertion, spring back and engage downward facing shoulders (not seen) in the insert, ensuring firm retention of the contact strip as a whole.
  • the insert is a body 410 pressed from a conventional ceramic using a mould with withdrawable pins.
  • the body 410 (Fig. 11) is designed for connection of two conductors and to receive correspondingly two connectors (contacts).
  • the body has two channels (slots) 411 extending in parallel across its top and centrally of each channel bottom a recess 412 extending from one end of the channel to a blind end almost across the insert.
  • the body also has associated with each channel 411 and recess 412 a slot or bore 413 which extends through the depth of the insert and across the width of the channel 411, and which intersects the recess 412 near its blind end.
  • the body has depthwise rebates 414 into which the channels 411 and recesses 412 open.
  • Each connector comprises two pieces or parts 415, 416.
  • the piece 415 (Figs. 12a, 12b) is formed conveniently from spring steel strip, e.g. having a thickness of 0.25 mm, and is hook-shaped having a limb 415a extending at an angle from one end of and over a wider mid-portion 415b, and a limb 415c extending from the opposite end of the portion 415b at right angles to it and away from the limb 415a.
  • the limb 415a affords the spring finger.
  • the limb 415c has in it a hole 417 and the portions of the limb at each side of the hole are joggled to form noses 418 the purposes of which will appear below.
  • the piece 416 is conveniently of phosphor bronze, e.g. 0.5 mm thick, and has in it a key-hole slot 419, the edges 419a of which act as guillotine blades. The end of the piece 416 adjacent the narrow part of the key-hole slot is bent over to provide a tang 420.
  • the pieces 415, 416 of each connector are inserted from the top of the insert 410 into the slot 413.
  • the mid-portion 415b of the piece 415 is positioned to lie on the base of channel 411 and the limb 415a projects above the insert.
  • the hole 417 is aligned with the recess 412.
  • the piece 416 is positioned so that the wider portion of the key-hole slot 419 is also aligned with the recess and with the guillotine edges well clear of the bottom of the recess.
  • the unbared end of an insulated cable 421 is inserted in the recess 412 so as to pass through the holes 417, 419 (Fig. 14a), and thereafter the piece 416 is pressed down until the tang 420 rests on the bottom of channel 411 (Fig. 14b); thereby the guillotine edges 419a cut through the insulation of the cable and the sides of the narrower part of the key-hole slot 419 make firm contact with the wire of the cable.
  • the noses 418 press firmly on the piece 416 ensuring that there is good electrical contact between the pieces 415, 416 and that the pieces are retained in the slot 413. Further, once the conductor cable 421 is guillotined, the cable is firmly retained and also assists to prevent detachment of the pieces of the connector 415, 416.
  • the connector arrangement has a number of advantages in relation to pre-wired lampholders.
  • the arrangement allows the contact- engaging portion of the connector to be of suitable spring metal at the same time as obtaining an increased area of contact between the wire core of the cable and the guillotine piece by the use of thicker metal for the latter. At the same time the risk of severing the cable wire due to forming the guillotine edges in the thin spring metal is avoided.
  • a further advantage is that arrangement avoids the necessity, after the guillotining operation has been performed, of deforming metal pieces to retain them in position thereby simplifying assembly.
  • This connector arrangement like the others is not only applicable with advantage to lampholders and the like with inserts as just described, but can also be applied to lampholders wholly of insulating material whether B.C. or Edison-screw, and safety holders such as described above.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Multi-Conductor Connections (AREA)
EP81305601A 1980-11-27 1981-11-26 Elektrische Steckfassung Withdrawn EP0053488A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8037990 1980-11-27
GB8037990 1980-11-27
GB8122974 1981-07-24
GB8122974 1981-07-24

Publications (1)

Publication Number Publication Date
EP0053488A1 true EP0053488A1 (de) 1982-06-09

Family

ID=26277634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305601A Withdrawn EP0053488A1 (de) 1980-11-27 1981-11-26 Elektrische Steckfassung

Country Status (3)

Country Link
EP (1) EP0053488A1 (de)
AU (1) AU7785881A (de)
ES (1) ES270890Y (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101257A1 (de) * 1982-08-09 1984-02-22 Kudos Lighting Limited Lampenfassung
EP2003676A3 (de) * 2004-06-25 2008-12-24 Matsushita Electric Works, Ltd. Entladungslampe ohne Elektrode
CN109244688A (zh) * 2018-09-29 2019-01-18 广东电网有限责任公司 一种0.4kV接地线紧固装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3634601A (en) * 1970-03-20 1972-01-11 Amp Inc Staking electrical contact and method of making an electrical connector
DE2141350A1 (de) * 1971-08-18 1973-03-01 Juergen Dipl Ing Ernsting Installationsgeraet, wie schalter, steckdose, drucktaste oder dergl
FR2236292A1 (en) * 1973-07-06 1975-01-31 Gmt Sa Electric light bulb socket - has internal spring guides defining channels for the connection leads
US3920305A (en) * 1974-01-21 1975-11-18 Ideal Ind No-strip tap connector
GB1430384A (en) * 1972-04-22 1976-03-31 Ashley Accessories Ltd Lampholders
FR2320643A1 (fr) * 1975-08-02 1977-03-04 Amp Inc Connecteur electrique
FR2351516A1 (fr) * 1976-05-10 1977-12-09 Ebenoid Perfectionnements aux douilles pour ampoules electriques
GB2001485A (en) * 1977-07-25 1979-01-31 Park Royal Porcelain Co Ltd Shuttered socket
GB2052888A (en) * 1979-06-26 1981-01-28 Park Royal Porcelain Co Ltd A connector for a lampholder

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3634601A (en) * 1970-03-20 1972-01-11 Amp Inc Staking electrical contact and method of making an electrical connector
DE2141350A1 (de) * 1971-08-18 1973-03-01 Juergen Dipl Ing Ernsting Installationsgeraet, wie schalter, steckdose, drucktaste oder dergl
GB1430384A (en) * 1972-04-22 1976-03-31 Ashley Accessories Ltd Lampholders
FR2236292A1 (en) * 1973-07-06 1975-01-31 Gmt Sa Electric light bulb socket - has internal spring guides defining channels for the connection leads
US3920305A (en) * 1974-01-21 1975-11-18 Ideal Ind No-strip tap connector
FR2320643A1 (fr) * 1975-08-02 1977-03-04 Amp Inc Connecteur electrique
FR2351516A1 (fr) * 1976-05-10 1977-12-09 Ebenoid Perfectionnements aux douilles pour ampoules electriques
GB2001485A (en) * 1977-07-25 1979-01-31 Park Royal Porcelain Co Ltd Shuttered socket
GB2052888A (en) * 1979-06-26 1981-01-28 Park Royal Porcelain Co Ltd A connector for a lampholder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101257A1 (de) * 1982-08-09 1984-02-22 Kudos Lighting Limited Lampenfassung
WO1984000854A1 (en) * 1982-08-09 1984-03-01 Doherty Patrick J Lampholder
EP2003676A3 (de) * 2004-06-25 2008-12-24 Matsushita Electric Works, Ltd. Entladungslampe ohne Elektrode
CN109244688A (zh) * 2018-09-29 2019-01-18 广东电网有限责任公司 一种0.4kV接地线紧固装置
CN109244688B (zh) * 2018-09-29 2023-11-07 广东电网有限责任公司 一种0.4kV接地线紧固装置

Also Published As

Publication number Publication date
ES270890U (es) 1984-02-01
AU7785881A (en) 1982-06-03
ES270890Y (es) 1984-10-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19821130

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19841123

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCOTT-COOMBER, MICHAEL