EP0014081A1 - Borne électrique - Google Patents

Borne électrique Download PDF

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Publication number
EP0014081A1
EP0014081A1 EP80300174A EP80300174A EP0014081A1 EP 0014081 A1 EP0014081 A1 EP 0014081A1 EP 80300174 A EP80300174 A EP 80300174A EP 80300174 A EP80300174 A EP 80300174A EP 0014081 A1 EP0014081 A1 EP 0014081A1
Authority
EP
European Patent Office
Prior art keywords
termination
limbs
conductor
plane
middle limb
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Withdrawn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
EP80300174A
Other languages
German (de)
English (en)
Inventor
Howard Edward Hines
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Publication of EP0014081A1 publication Critical patent/EP0014081A1/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Withdrawn legal-status Critical Current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
    • 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
    • H01R4/2445—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 having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives
    • 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
    • H01R4/2445—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 having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives
    • H01R4/245—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 having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives the additional means having two or more slotted flat portions

Definitions

  • This invention is concerned with electrical terminations for making an electrical connection to an electrical conductor.
  • a common type of electrical termination is formed by a'flat resilient plate split into two limbs. .A conductor is jammed into the termination between the two limbs and, as it is urged between the two limbs, it forces the two limbs apart in the direction of a plane containing the plate.
  • a typical example of such a bifurcated termination is shown in British Patent Specification No 1 030 235. As the conductor is jammed into the termination any insulation and/or any oxide film on the surface of the conductor is crushed and removed from the surface of the conductor so that there is no need to strip the insulation from the conductor or clean the conductor before it is jammed into the termination.
  • this type of terminal is also known for this type of terminal to be capable of making contact with two separate conductors and, in this case, the flat pTsbe is split into three separate limbs.
  • this type of terminal is two bifurcated terminals arranged back-to-back and an example of such a terminal is shown in British Patent Specification No 1 317 426.
  • aluminium deforms readily by cold flow and, therefore, if it is subjected to high contact pressures in an,attempt to exclude air from between its contact surfaces, the aluminium merely flows away from the point of highest contact pressure and this can lead to an aluminium conductor being sheared if the contact pressure is too great.
  • a method of making an electrical termination assembly comprises providing an electrical termination including a flat resilient plate having two open-ended slots arranged side-by-side to split the plate into three limbs all.lying in the same plane, placing an electrical conductor between the middle limb and the two outer limbs, and urging the conductor into the termination in a direction towards the base of the slots, to jam the conductor between the edges of adjacent limbs in so doing causing the two outer limbs to splay apart in a direction of said plane, and causing two outer limbs and the middle limb to splay apart in a direction transverse to said plane.
  • an electrical termination assembly comprises a flat resilient plate having two open-ended slots arranged side-by-side to split the plate into three limbs which all lie in the same plane in their relaxed state, and an electrical conductor jammed between the edges of the middle and the two outer limbs, the conductor causing the two outer limbs to splay apart in a direction of said plane, and causing the two outer limbs and the middle limb to splay apart in a direction transverse to said plane.
  • the limbs of the termination By inserting a conductor into both of the slots, formed in a three limbed termination, the limbs of the termination have two degrees of freedom in that they can move in a direction transverse to the plane containing the limbs and splay apart in the direction of the plane containing the limbs. These two degrees of freedom provide a less coarse relationship between the separation of the limbs and a restoring force of the limbs which provides the contact pressure against the conductor. In addition to this, since the conductor is jammed into two slots instead of one, there is twice the opportunity for making a good contact between the termination and the conductor.
  • free end portions of the two outer limbs of the termination are bent away from the middle limb in a direction transverse to said plane and, in this case, the conductor is initially placed against the outturned end portions of the two outer limbs and against an end portion of the middle limb before being urged into the termination.
  • the provision of the bent outturned portions of the two outer limbs enables the conductor to be placed between the outturned end portions of the two outer limbs and the end portion of the middle limb so that when it is urged into both slots it is forced between the middle limb and the two outer limbs.
  • an electrical termination comprises a flat resilient plate having two open-ended slots arranged side-by-side which split the plate into three limbs all lying in the same plane, free end portions of the two outer limbs being bent away from the middle limb in a direction transverse to said plane, the arrangement being such that, in use, a conductor is placed between the outturned end portions of the outer limbs and an end portion of the middle limb and urged into the termination towards the base of the slots which causes the conductor to jam between the edges of the adjacent limbs and causes the outer limbs to splay apart in the direction of said plane, and the outer limbs and the middle limb to splay apart in a direction transverse to said plane.
  • the conductor is preferably urged into the termination by a three-legged insertion tool, the middle leg of the tool lying . against one side of the middle limb of the termination and the outer legs of the tool lying against the other side of the outer limbs of the termination.
  • the insertion tool is preferably a hand operated tool.
  • the conductor is cropped to length upon insertion of the conductor into the termination with the insertion tool.
  • the termination may include a bent tab which lays in the path of the conductor, one of the outer legs of the insertion tool cooperating with the bent tab to shear the conductor as it is inserted into the termination.
  • the insertion tool may include a pair of wire cropping blades actuated by a lost motion mechanism so that, after the insertion tool has completed the insertion of the conductor into the termination, further downward movement of its handle does not result in further downward movement of the three legged tool but, instead, is converted into operation of the blades of the cropping tool to crop the conductor to length.
  • the middle limb of the termination is indented in a direction transverse to said plane and in a direction away from the end portions of the two outer limbs.
  • This indentation in the middle limb provides a seat for the conductor.
  • the indentation prevents the conductor from being driven outwards from the termination by the outwards component of the restoring force acting on the limbs.
  • the indent also provides a positive location for the conductor and so enables the insertion of the conductor to be monitored.
  • the conductor is made from aluminium it is desirable to have a high restoring force between the limbs whilst the conductor is being inserted to ensure that any insulation on the conductor is removed and to ensure that any oxide coating on the surface of the conductor is also removed.
  • the contact pressure against the conductor after it has been inserted is not so great as to cause plastic flow of the-conductor.
  • Another advantage of the indentation is that it has the effect of reducing the contact pressure against the conductor as the conductor moves against the indented part of the middle limb.
  • the depth of the indentation may be varied to adjust the degree of reduction in the contact loading and preferably the depth of the indentation in the middle limb is in a range from 25% to 50% of the thickness of the plate. It is further preferred that the depth of the indentation is in a range from 35 % to 40% of the thickness of the plate.
  • the resilient and elastic properties of all the common materials from which terminations are made for example, nickel silver, phosphor bronze or berylium copper are all sufficiently similar for the ratio between the size of the slots, the dimensions of the limbs, and the thickness of the conductor to be similar. It is preferred that the width of each of the slots is within a range from 50% to 90% of the width of the conductor. It is further preferred , and it is especially so when the conductor is made from aluminium, that the width of the slots is in a range from 60% to 80% of the width of the conductor,and the optimum width of the slot is substantially 70% of the width of the conductor.
  • the termination is arranged so that the ratio of the thickness of its plate to the width of the outer limbs is in a range from 1:14 to 1:11 and the ratio of the thickness of the plate to the effective length of each slot is in a range from 1:10 to 1:14.
  • the effective length of the slot is the length of the slot between the position of the conductor after it has been inserted into the termination and the base of the slot. It is this length which is one of the factors determining the contact pressure exerted on the conductor after it has been inserted into the termination.
  • the width .of the slot may be increased below the position occupied by the conductor and this enables the manufacture of the terminations to be simplified.
  • the ratio of the thickness of the plate to the width of the limbs in the region between the conductor and the base of the slots which is important but, of course, it is the width of the slots at the rest position of the conductor which is critical.
  • the ratio of the width of the outer limbs to the middle limb is substantially 1:2.
  • the tips of the end portions of the two outer limbs are parallel to the tip of the middle limb, and the tips of the outer limbs are spaced from the tips of the middle limb to provide an interference fit between them for the outside of an insulated conductor.
  • an insulated conductor can be manually fed into the nip between the tips of the outer limbs and the middle limb and then remains in this position until it is urged towards the base of the slots by the insertion tool.
  • the termination is mounted in a block of insulating material which includes means to grip and support an insulated conductor on at least one side of the termination.
  • An electrical termination 1 is made from a flat plate of nickel silver and includes two parallel slots 2 arranged side-by-side which split the plate into three limbs, two outer limbs 4 and 5 and a middle limb 6. End portions 7 and 8 of the outer limbs 4 and 5 are bent outwards in a direction transverse to a plane containing the plate at an angle of substantially 30°. These end portions may be bent at a steeper angle, for example 45° or a shallower angle, but it is preferred that they are bent at an angle of substantially 30°. Tips 9 and 10 of the limbs 4 and 5 are bent so that they are parallel to the end of the middle limb 6.
  • the middle limb includes an indented portion 11 which is indented in a direction transverse to the plane containing the plate and in a direction away from the bent portions 7 and 8 of the outer limbs 4 and 5.
  • the termination 1 may form part of any type of terminating assembly and may be arranged to be fixed or soldered to a circuit board or form part of any electrical apparatus but frequently it is part of a connecting block.
  • the connecting block may include a large number of terminations, for example at least ten and these may all be connected to a common base or, alternatively, be electrically insulated from one another.
  • the,or each , termination 1 is surrounded by a housing 12 of insulating material.
  • the connecting block contains a number of terminations 1
  • the housing is formed by a single unit arranged to contain a number of the terminations 1 arranged in a generally side-by-side configuration.
  • the housing 12 includes two clamping slots 13 and 14 aligned generally with the plane containing the termination and, these clamping slots 13 and 14 are arranged to grip the insulating covering of an electrical conductor connected to the termination 1.
  • the particular example of termination is intended to be used with a wire having an aluminium conductor of 0.5 mm diameter with a foamed polyethylene insulating covering having a wall thickness of about 0.1 mm, so giving an overall external diameter of 0.7 mm.
  • a wire is being introduced as a standard in the British Telephone System.
  • the termination 1 is made by a punching and stamping operation upon a sheet of nickel silver having a thickness of 0.8 mm.
  • the limbs 4 and 5 have a width of 1.12 mm and the limb 6 has a width of 2.25 mm.
  • the slots 2 have a width of 0.35 mm and the effective length of the slots, that is the distance from the centre of the indent 11 to the base of the slots 2, is 8 mm.
  • the depth of the indent is 0.3 mm and it has an overall length of about 1 mm.
  • the length of the tips 9 and 10 is also about 1 mm and the separation of the tips 9 and 10 from the end of the limb 6 in a direction transverse to the plane containing the termination 1 is arranged to be an interference fit on the outside of an insulated conductor and thus the tips of the limbs are separated by a bare 0.7 mm.
  • a wire 15 having a conducting core 16 of aluminium and a foamed polyethylene covering 17 is placed between the tips 9 and 10 and the end of the middle limb 6 and then urged into the termination towards the base of the slots 2.
  • the conductor is urged downwards, it is carried between the . outer limbs 4 and 5 and the middle limb 6 and adjacent edges of all three limbs 4, 5, and 6, cut through the insulating cowering 17, through any oxide film formed on the surface of the conductor 16 and into the conductor 16, as shown in Figure 4.
  • the wire is urged into the termination 1 until it reaches the indented portion 11.
  • the limbs 4 and 5 splay apart from one another in the direction of the plane containing the termination 1 and, also, the limbs 4 and 5 splay apart from the limb 6 in a direction transverse to the plane containing the termination 1.
  • the wire is also gripped between wire clamping slots 13 and 14 to provide some mechanical restraint on the wire 15.
  • the wire 15 is urged into the termination 1 using a three-legged tool as shown in Figure 5.
  • the three-legged tool includes a middle leg 18 having a lip 19 at its end and a pair of outer limbs 20.
  • the three legs are parallel to one another but the middle leg 18 is separated from the outer legs 20 in a direction transverse to a plane containing the outer legs 20.
  • the tool which is a hand operated tool, is placed with the middle leg 18 between the end portions 7 and 8 of the limbs 4 and 5 and against one side of the middle limb 6.
  • the lip 19 passes round the outside of the wire 15, as shown in Figure 5, and the ends of the outer legs 20 bear against the wire 15.
  • the tool is then urged downwards to urge the conductor 15 into the termination 1 and as the tool moves down, the outer legs 20 bear against the other side of the limbs 4 and 5, again as shown in Figure 5.
  • the operator feels the wire 15 "click-into" the indent 11 downward pressure on the tool is released and the tool withdrawn.
  • a first modification of the termination 1 is also shown in Figure 5 and, in this modification, a tab 21 is provided on the outer limb 5 of the termination and this tab is bent at right angles to the plane containing the termination and extends into the path of the wire 15. This tab 21 cooperates with the end of one of the outer legs 20 of the tool to crop the wire 15 to length as it is inserted into the termination 1.
  • a second modification of the termination 1 is illustrated in Figure 6.
  • the slots 2 are made wider towards their bases and, in this example, the width of the slots 2 is increased from 0.35 to 0.6 mm in the region between the indented portion 11 and the base of the slots.
  • the width of the slots is increased in this region, it is the dimensions of the limbs bounding the wider portion of the slots which is most important in determining the characteristics of the termination 1.
  • the portion of the limbs 4 and 5 against the wider portion of the slots which have a width of 1.12 mm and the portion of the limb 6 against the wider part of the slot which has a width of 2.25 mm.
  • the termination 1 and its modifications have been especially designed to be used with a wire having an aluminium conductor of a diameter of 0.5 mm
  • the termination may be used for terminating wires having copper conductors and, indeed, may also be used with uninsulated conductors. Since copper does not deform by cold flow to the same extent as aluminium, the termination 1 may be used with a wider range of copper conductors than with aluminium.
  • the termination shown and described is suitable for use with wires having copper conductors with diameters in a range from 0.4 to 0.9 mm.

Landscapes

  • Insulated Conductors (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
EP80300174A 1979-01-24 1980-01-18 Borne électrique Withdrawn EP0014081A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7902473 1979-01-24
GB7902473 1979-01-24

Publications (1)

Publication Number Publication Date
EP0014081A1 true EP0014081A1 (fr) 1980-08-06

Family

ID=10502694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80300174A Withdrawn EP0014081A1 (fr) 1979-01-24 1980-01-18 Borne électrique

Country Status (2)

Country Link
EP (1) EP0014081A1 (fr)
WO (1) WO1980001627A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121224A1 (fr) * 1983-03-29 1984-10-10 Siemens Aktiengesellschaft Borne pour la connexion sans dénudage de conducteurs électriques dans les répartiteurs d'installations de télécommunications, notamment de téléphone
EP0136007A2 (fr) * 1983-08-26 1985-04-03 General Motors Corporation Borne à déplacement d'isolant
FR2642905A1 (fr) * 1989-02-09 1990-08-10 Mars Actel Dispositif de connexions pour deux conducteurs electriques isoles a des niveaux differents
EP0393927A1 (fr) * 1989-04-21 1990-10-24 The Whitaker Corporation Procédé de connexion de câbles de puissance plats

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941050A1 (de) * 1969-08-12 1971-03-04 Siemens Ag Klemmelement zum loetfreien Anschluss isolierter elektrischer Leiter
DE2142850A1 (de) * 1971-08-26 1973-03-08 Krone Gmbh Elektrische klemmverbindungsvorrichtung zum anschluss eines oder mehrerer isolierter draehte an einem anschlusselement
DE2241518A1 (de) * 1972-08-24 1974-03-21 Felten & Guilleaume Schaltanl Schaltbare, loet- und schraubfreie, elektrische klemmanschlussverbindung
DE2330038A1 (de) * 1972-11-28 1974-05-30 Sprecher & Schuh Ag Kontaktstueck zum elektrischen anschliessen eines flachkabels
DE2455354A1 (de) * 1973-11-22 1975-05-28 Yamaichi Denki Kogyo K K Elektrischer leitungsverbinder
FR2269799A1 (en) * 1974-04-30 1975-11-28 Pouyet Ets Henri Connector for unstripped insulated cables - has slit for cable between two lips joined to spring hinge cylinders
US4029384A (en) * 1975-01-20 1977-06-14 Illinois Tool Works Inc. Grounding clip

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941050A1 (de) * 1969-08-12 1971-03-04 Siemens Ag Klemmelement zum loetfreien Anschluss isolierter elektrischer Leiter
DE2142850A1 (de) * 1971-08-26 1973-03-08 Krone Gmbh Elektrische klemmverbindungsvorrichtung zum anschluss eines oder mehrerer isolierter draehte an einem anschlusselement
DE2241518A1 (de) * 1972-08-24 1974-03-21 Felten & Guilleaume Schaltanl Schaltbare, loet- und schraubfreie, elektrische klemmanschlussverbindung
DE2330038A1 (de) * 1972-11-28 1974-05-30 Sprecher & Schuh Ag Kontaktstueck zum elektrischen anschliessen eines flachkabels
DE2455354A1 (de) * 1973-11-22 1975-05-28 Yamaichi Denki Kogyo K K Elektrischer leitungsverbinder
FR2269799A1 (en) * 1974-04-30 1975-11-28 Pouyet Ets Henri Connector for unstripped insulated cables - has slit for cable between two lips joined to spring hinge cylinders
US4029384A (en) * 1975-01-20 1977-06-14 Illinois Tool Works Inc. Grounding clip

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121224A1 (fr) * 1983-03-29 1984-10-10 Siemens Aktiengesellschaft Borne pour la connexion sans dénudage de conducteurs électriques dans les répartiteurs d'installations de télécommunications, notamment de téléphone
EP0136007A2 (fr) * 1983-08-26 1985-04-03 General Motors Corporation Borne à déplacement d'isolant
EP0136007A3 (fr) * 1983-08-26 1987-06-16 General Motors Corporation Borne à déplacement d'isolant
FR2642905A1 (fr) * 1989-02-09 1990-08-10 Mars Actel Dispositif de connexions pour deux conducteurs electriques isoles a des niveaux differents
EP0383135A1 (fr) * 1989-02-09 1990-08-22 MARS-ACTEL Société Anonyme dite: Dispositif de connexions pour deux conducteurs électriques isolés à des niveaux différents
EP0393927A1 (fr) * 1989-04-21 1990-10-24 The Whitaker Corporation Procédé de connexion de câbles de puissance plats

Also Published As

Publication number Publication date
WO1980001627A1 (fr) 1980-08-07

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Inventor name: HINES, HOWARD EDWARD