EP0287352A2 - Fiches électriques - Google Patents

Fiches électriques Download PDF

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Publication number
EP0287352A2
EP0287352A2 EP88303327A EP88303327A EP0287352A2 EP 0287352 A2 EP0287352 A2 EP 0287352A2 EP 88303327 A EP88303327 A EP 88303327A EP 88303327 A EP88303327 A EP 88303327A EP 0287352 A2 EP0287352 A2 EP 0287352A2
Authority
EP
European Patent Office
Prior art keywords
insert portion
plug
recess
electrical
insert
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Withdrawn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
EP88303327A
Other languages
German (de)
English (en)
Other versions
EP0287352A3 (fr
Inventor
Terence E. King
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.)
Bradshaw Raymond
Lapidus Alfred David Henry
Lapidus Robyn Griffith
Lapidus Samuel Henry Alfred
Original Assignee
Bradshaw Raymond
Lapidus Alfred David Henry
Lapidus Robyn Griffith
Lapidus Samuel Henry Alfred
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 Bradshaw Raymond, Lapidus Alfred David Henry, Lapidus Robyn Griffith, Lapidus Samuel Henry Alfred filed Critical Bradshaw Raymond
Publication of EP0287352A2 publication Critical patent/EP0287352A2/fr
Publication of EP0287352A3 publication Critical patent/EP0287352A3/fr
Withdrawn legal-status Critical Current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
    • H01R31/00—Coupling parts supported only by co-operation with counterpart
    • H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2103/00—Two poles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/28—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable
    • H01R24/30—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable with additional earth or shield contacts
    • 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
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
    • H01R4/242—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members being plates having a single slot
    • H01R4/2425—Flat plates, e.g. multi-layered flat plates
    • H01R4/2429—Flat plates, e.g. multi-layered flat plates mounted in an insulating base

Definitions

  • This invention concerns improvements relating to electrical plugs and particularly, though not exclus strictlyively, concerns electrical plugs of the type employed for coupling domestic and other electrical appliances to socket outlets of the mains electrical supply.
  • the present invention results from our continuing development of an electrical plug of the above-mentioned type which can be simply and securely assembled to an appliance flex or cable without requiring use of a screw­driver or other tools.
  • the search for an electrical plug which truly can be said to be assembl­able to a flex or cable without use of a screwdriver, wire-strippers etc. has long occupied many minds and the art is replete with failed screwless plugs, that is to say plugs alleged to achieve the aim of simple screwless attachment to a flex or cable but which for one reason or another have failed to achieve commercial success.
  • an electrical plug of the aforementioned type comprised a plug body portion with terminal pins to be inserted into the corresponding openings of a socket out­let, and an insert portion to which an appliance cable is assembled as a simple screwless operation as a preliminary step in the connection of the plug to the cable, the insert portion being enterable into a recess in the body portion of the plug for completing the connection of the plug to the cable by virtue of the plug body portion and the insert portion having contact-­establishing means which cooperate when the insert portion is entered into the recess.
  • the plug body portion has within its said recess insulation-piercing pins connected to the plug terminal pins and arranged to enter into conductor-receiving channels provided in the insert portion as the insert portion is entered into the recess; by threading the cable conductors into the conductor-­receiving channels in the insert portion, without stripping the insulation from the conductors, as a preliminary step in the assembly of the plug to the cable, it is ensured that the entry of the insert into the recess results in the insulation-piercing pins piercing the conductor insulation of the conductors received in the channels and making electrical connection thereto.
  • the insert portion is advantageously designed to accept cable conductor portions all of the same length and incorporates it own integral cable grip and thus can be assembled to the end of a cable by the simplest of operations.
  • EP0063120 Refinements of the basic idea described in EP0063120 are disclosed in our European Patent Application No. 85302871.0 (Publication No. EP0162597) and the most fundamental of these is to provide a means associated with the body portion of the plug for providing a mechanical advantage for facilitating the insertion of the insert portion into the plug body recess and thus, in the embodiment provided with insulation-piercing pins, enabling the mechanical resistance to piercing of the insulation to be overcome more readily.
  • the means for providing the mechanical advantage can advantageously comprise an additional internally screw-threaded component adapted for cooper­ation with an externally screw-threaded portion of the plug body to drive the insert portion positively into its accommodating recess when the internally screw-threaded component is manually screwed down onto the plug body portions.
  • the present invention provides yet further refine­ments of the basic invention of EP0063120 and primarily, though not exclusively provides for a metal backup to the conductor-piercing pins so that the forces developed as the pins pierce the insulation of the cable conductors, and thereafter by virtue of the presence of the pins pierced through the insulation and through the stranded cable conductors, are not resisted or backed up simply by the moulded plastics material of the insert. It is believed that by virtue of such an arrangement an even better and more secure electrical connection between the stranded conductors of the cable and the insulation-­piercing pins will be obtained.
  • the present invention provides an improved cable clamping arrangement which utilises a clamping cone of generally frusto-conical external configuration formed with an axial cable-receiving cylindrical bore, the cone being defined by a plurality of conical generatrices connected, in zig-zag fashion, each to the preceding generatrix at the bottom of the cone and to the succeeding generatrix at the top of the cone.
  • the cone is expandible and contractible in concertina fashion.
  • the cone can thus be fitted over a cable sheath and, with a complementary conical clamping recess formed in the back of the insert, can be forcibly contracted down onto the cable as the insert driving component is screwed down onto the plug body.
  • an electrical plug comprising a body portion 1 which, as is described in EP0063120 and EP0162597 afore-­mentioned, is provided with a recess (not shown) into which there can be introduced an insert portion or fanning block 2, the plug body portion being provided with an externally screw-threaded portion (not shown) which cooperates with an internally screw-threaded insert driving portion 3 (see Fig 2) which, as described in EP0162597, provides a mechanical leverage for the insertion of the insert portion 2 into the plug body recess.
  • the plug body portion 1 is provided with three flat bladed piercing pins 4 each of which is electrically connected to a respective one of the L, N and E plug terminal pins 5. As described in EP0063120 and EP0162597, the insulation piercing pins 4 project into the recess formed in the plug body portion for making insulation-displacing electrical contact with conductors pre-assembled into the insert portions when the insert portion is fully entered into the recess.
  • the insert portion or fanning block 2 (so called since it serves to fan out the L, N and E conductors of a cable) comprises an externally cylindrical moulding 6 formed with an internal bore 7 or conductor-receiving channel (see Fig 2) which at its rearmost end is frusto-conical for receiving a cable-­clamping cone 8 and otherwise is as shown in Fig 2.
  • the bore 7 communicates with three radially-directed conductor-receiving channel portions 9 each of which is intersected by a recess 10 for receiving a flat metal backup piece 11 configured as shown in Fig 1.
  • An apertured fanning block end cap 12 which as shown in Fig 3 can be hingedly connected to the fanning block 2 by means of a moulded hinge, serves as a piercing pin locator for guiding the piercing pins 4 into the con­ductor receiving channels 9 of the fanning block 2 as can best be seen from Fig 2.
  • Integrally formed popper pins 13 are provided on the pin locator cap 12 for engagement in bores 14 provided in the end face of the fanning block 2 to secure the pin locator cap 12 in closed condition.
  • Fig 1A and Fig 2 show how the conductors 15 of a cable are inserted, in use of the plug, through the central bore of the fanning block and are fanned out and laid into the respective cones of the conductor-receiving channels 9, the same being colour coded and/or provided with indicia to guide correct assembly.
  • the pin locator 12 cap can be closed. Insertion of the fanning block into the plug body recess will then cause the insulation piercing pins 4 to enter into the front end of the fanning block, guided by the apertures in the pin locator cap 12.
  • the metal backup pieces 11 are generally U-shaped as shown in Fig 1 with the open mouth of the U shaped to define inwardly converging opposed surfaces which serve to guide a conductor laid into one of the channels 9 centally between the spaced-apart legs of the U. Inwardly of the converging opposed surfaces of the mouth of the U, there is provided a generally parallel throat portion which serves an insulation displacement function as the conductor is forced into the U-shaped piece.
  • the arrangement of the recesses 10 is such that the U-shaped pieces 11 lie transversely to conductors laid into the channels 9, and the flat bladed pins 4 align with the conductors, as shown in Fig 4.
  • the clamping cone 8 may be seen to be in the form of a radially expandible and contractible frusto-conical member having an internal cylindrical bore which can be fitted over the sheath of a cable and, when introduced into the complementarily shaped frust-concial recess in the back of the fanning block and urged inwardly by the action of the fanning block driving member 3, will clamp down onto the cable thereby forming an effective cable clamp for the plug.
  • the clamping cone 8 is formed as a plurality of conical generatrices which are connected at their opposite ends to the generatrices on either side, and as can best be seen from Fig 2 each generatrix is wedge shaped so that as the clamping cone is forced into the recess in the back of the fanning block a radially inwardly camming action is exerted upon the generatrices of the clamping cone.
  • the present invention provides an easy-assembly domestic electrical plug in use of which the conductors of a cable need only be threaded into the central bore of the fanning block and then fanned out into their respective conductor-receiving channels whereupon, after trimming off any excess length of conductor with scissors, insertion of the fanning block into the plug body recess and driving home of the fanning block by means of the screw component completes the connection of the cable to the plug, with the cable conductors pierced by insulation-piercing pins backed up with metal backup pieces, and also securely clamps the cable to the plug.
  • the fanning block 6 has its conductor-receiving channels defined by the internal bore 7 and the communicating channel portions 9, it could alternatively be formed with con­ductor receiving channels more in the form of those described in EP0063120 and EP0162597.
  • the configuration of the clamping cone is susceptible to variation and a single division in an otherwise contin­uous hollow frusto-conical member could be employed, for example, rather than the multiple interconnected generatrix arrangement described, the essential require­ment being that the cone be capable of radial deformation under the camming action of the recess in the rear of the fanning block.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP88303327A 1987-04-13 1988-04-13 Fiches électriques Withdrawn EP0287352A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8708775 1987-04-13
GB8708775A GB8708775D0 (en) 1987-04-13 1987-04-13 Electrical plugs

Publications (2)

Publication Number Publication Date
EP0287352A2 true EP0287352A2 (fr) 1988-10-19
EP0287352A3 EP0287352A3 (fr) 1990-04-04

Family

ID=10615712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88303327A Withdrawn EP0287352A3 (fr) 1987-04-13 1988-04-13 Fiches électriques

Country Status (2)

Country Link
EP (1) EP0287352A3 (fr)
GB (2) GB8708775D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2409353A (en) * 2003-12-20 2005-06-22 Deutsch Ltd A re-useable insulation piercing connector

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6017243A (en) * 1998-03-26 2000-01-25 Leviton Manufacturing Co., Inc. Strain-relieved, water-tight cord grip
MX2021002297A (es) 2018-08-29 2021-04-28 Leviton Manufacturing Co Dispositivos de clavija y manga.
WO2020076282A1 (fr) 2018-10-08 2020-04-16 Leviton Manufacturing Co., Inc. Dispositif à broche et manchon doté d'éléments destinés à favoriser un assemblage plus facile

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980380A (en) * 1972-11-21 1976-09-14 Bunker Ramo Corporation Electrical connectors with plural simultaneously-actuated insulation-piercing contacts
WO1982000387A1 (fr) * 1980-07-15 1982-02-04 H Usher Ameliorations relatives a des fiches electrioues
WO1983002531A1 (fr) * 1982-01-12 1983-07-21 Derek Hayes Dispositif de couplage electrique
EP0162597A2 (fr) * 1984-04-24 1985-11-27 Lapidus, Samuel Henry Alfred Fiche électrique domestique à assemblage aisé

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2104307A (en) * 1981-08-06 1983-03-02 Derek Hayes Improvements in electrical coupling devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980380A (en) * 1972-11-21 1976-09-14 Bunker Ramo Corporation Electrical connectors with plural simultaneously-actuated insulation-piercing contacts
WO1982000387A1 (fr) * 1980-07-15 1982-02-04 H Usher Ameliorations relatives a des fiches electrioues
WO1983002531A1 (fr) * 1982-01-12 1983-07-21 Derek Hayes Dispositif de couplage electrique
EP0162597A2 (fr) * 1984-04-24 1985-11-27 Lapidus, Samuel Henry Alfred Fiche électrique domestique à assemblage aisé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2409353A (en) * 2003-12-20 2005-06-22 Deutsch Ltd A re-useable insulation piercing connector
WO2005062429A1 (fr) * 2003-12-20 2005-07-07 Deutsch Limited Connecteur de cable

Also Published As

Publication number Publication date
GB2204750A (en) 1988-11-16
EP0287352A3 (fr) 1990-04-04
GB8808706D0 (en) 1988-05-18
GB2204750B (en) 1991-06-19
GB8708775D0 (en) 1987-05-20

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