EP0043437B1 - Kontaktglied zur mechanischen Sicherung mit zwei aktiven freitragenden Schenkeln - Google Patents

Kontaktglied zur mechanischen Sicherung mit zwei aktiven freitragenden Schenkeln Download PDF

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Publication number
EP0043437B1
EP0043437B1 EP19810104120 EP81104120A EP0043437B1 EP 0043437 B1 EP0043437 B1 EP 0043437B1 EP 19810104120 EP19810104120 EP 19810104120 EP 81104120 A EP81104120 A EP 81104120A EP 0043437 B1 EP0043437 B1 EP 0043437B1
Authority
EP
European Patent Office
Prior art keywords
conductor
portions
lower portions
retainer
insulation
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
EP19810104120
Other languages
English (en)
French (fr)
Other versions
EP0043437A2 (de
EP0043437A3 (en
Inventor
Sharanjit Singh Aujla
John Davidson Lee
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of EP0043437A2 publication Critical patent/EP0043437A2/de
Publication of EP0043437A3 publication Critical patent/EP0043437A3/en
Application granted granted Critical
Publication of EP0043437B1 publication Critical patent/EP0043437B1/de
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
    • 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

Definitions

  • This invention relates to retaining members having dual action cantilever beams, that is with two spaced beams between which a further member is pushed to be retained therein.
  • the invention is applicable to contacts for electrical conductors, and more particularly to insulation displacing contacts for insulated conductors.
  • Conductor contacts and particularly insulation displacing contacts are well known, comprising generally, two spaced legs or beams, between which the conductor is pushed.
  • the insulation may be removed or displaced by crushing, cutting or slicing. In crushing the insulation is squeezed between conductor and terminal and pushed off the conductor.
  • U.S. patent 3,112,147 A typical example of such a terminal is described in U.S. patent 3,112,147.
  • cutting the insulated conductor is pushed down between two cutting edges which extend in a direction normal to the axis of the conductor. In such terminals the cutting edges cut through the insulation, which may then be deformed sideways.
  • U.S. patent 3,027,536 describes one form of such a terminal.
  • slicing as described in U.S. patent 3,521,221
  • two parallel cuts are made through the insulation, in the direction parallel to the axis of the conductor, and a short length of insulation is removed from the conductor.
  • the previous forms of terminal generally have legs or beams which either have substantially parallel sides or taper in one direction, acting as cantilevers. As a conductor is pushed down between the beams or legs they are stressed, but the stress is not uniformly distributed, the stresses being concentrated at the roots of the beams, both during wire insertion and when the wire is at rest in the terminal.
  • the terminals have poor elastic compliance and a high wire insertion force, with poor specific volume efficiency. Also, for insulated conductors, such terminals are often effective for only one type, or a limited number of types of insulation.
  • the present invention provides a retaining member which has improved qualities and a high degree of stress uniformity.
  • the retaining member has, in general terms, a pair of cantilever beams extending from a base, the beams having opposed, spaced apart, substantially parallel inner edges, each beam having upper and lower portions and an entrance portion, each lower portion having an outer edge tapered upward and inward and each upper portion having an outer edge tapered upward and outward from the lower portion, the entrance portion defined by upwardly and outwardly inclined upper edges of the beams.
  • a neck is formed in each beam at the conjunction of the upper and lower portions of the beams, the necks forming pivotting positions for the upper portions relative to the lower portions when a cylindrical member is forced through the entrance portion.
  • a contact embodying the present invention provides a contact which will accept a range of conductor sizes and will accept conductors having many different types of insulation, with efficient stripping properties, improved connection quality and with a high degree of stress uniformity.
  • a contact indicated generally at 10, has two beams 11 and 12 extending upwardly from a base 13.
  • the beams 11 and 12 have opposed inner edges 14 which are parallel and spaced apart a predetermined distance according to the wire size or sizes to be accepted, to define a slot 1 5.
  • the outer edge of each beam is in two parts 16a and 16b and 17a and 17b respectively, the lower parts 16a and 16b inclined upwardly and inwardly and the upper parts 17a and 17b inclined upwardly and outwardly, the two parts of each surface conjoined at a neck position 18.
  • Each beam has an upper or top edge 19 inclined upwardly and outwardly, from the slot 15, each top edge 19 is joined to the related inner edge 14 by a radius 20.
  • each beam has a lower portion 11 a and 12a and upper portions 11 b and 12b respectively, the neck 18 defining the junction of the portions.
  • FIGs 2, 3 and 4 illustrate certain steps in inserting a conductor into a terminal.
  • an insulated conductor 25 having a conducting core 26 and an insulating layer 27 is resting on the top edges 19.
  • the top parts 11 b and 12b of the beams 11 and 12 deflect outwards, in effect pivotting at the necks 18.
  • the upper portions 11 b and 12b are extensively and plastically deflected or deformed past the elastic limit of the material, particularly at the neck 18, during the action of stripping the insulation, while the plastic deformation of the lower portions 11 a and 12a is minimized.
  • the upper portions remain deformed, as illustrated in Figure 4, the angle between the top portion of the opposed sides 14 being ⁇ and the angle between the bottom portions of the opposed sides being 0.
  • the relatively high stresses encountered during insulation stripping at the entry point are largely distributed in the upper portions 11 b and 12b with the lower portions 1 a and 12a being uniformly stressed, to a lower extent than the upper parts.
  • the beams With the tapering of the lower portions, the beams have improved specific volume efficiency and an increased elastic compliance. It is the lower stressed lower portions of the beam which provide the desired wire rest point properties.
  • the contact provides lower insertion forces compared to conventional designs, while at the same time providing effective insulation removal and adequate contact forces to ensure a gas-tight connection and satisfactory conductor retention.
  • the present contact has independently deflecting cantilever type dual-taper beams, with dual action, as opposed to the more uniform or single taper beams previously used.
  • the dual action beams provide efficient insulation stripping at low wire insertion forces without sacrificing wire rest point compliance, whereas high insertion forces occur with previous designs during insulation stripping with similar or lower rest point compliance.
  • the present design permits the use of optimum tapered beams with more uniformly distributed stresses. This gives increased elastic compliance compared to previous terminals when the face end portion of each beam normally works at a lower stress than that at the base of a beam, resulting in a considerably greater permanent set in the beams.
  • the contacts are rugged and cheaply produced by stamping. With improved stress distribution, thinner material and a smaller overall size can be obtained.
  • Figures 5, 6 and 7, illustrate three variations or alternate arrangements of the contact as in Figure 1, and Figures 2 to 4. While in Figure 1, a single contact is illustrated, multiple forms can also be provided.
  • Figure 5 illustrates a "back-to- back" arrangement with beams 11 and 12 extending from both sides of a common base 13.
  • Figure 6 illustrates a strip arrangement, in which two or more contacts are formed from a long strip having a long base 13.
  • Figure 7 illustrates a double contact in which the bases 13 are common with an interconnecting web 30.
  • a range of conductor sizes can be accommodated by one particular size of contact, if desired, although contacts can be designed specifically for each conductor size.
  • FIG 8 is illustrated a contact, as in Figure 1 and in Figures 2, 3 and 4, for acceptance of 22 AWG (.645 mm), 24 AWG (.511 mm) and 26 AWG (.409 mm) telephone wire conductors.
  • the various dimensions indicated, and listed below, are for each conductor but are approximate and can be varied.
  • the angle A can vary as can the radii r but the particular dimensions and values given are particular dimensions and values given are particularly suitable for telephone conductors, having copper conductors, of the gauges give. All the generally used insulating materials can be stripped, e.g. paper pulp, plastic, foam, foam skin, etc.
  • the position of the neck 18 be below the junction of the radius 20 and the inner edges 14, and that the rest point of the conductor 26 is below the neck 18.
  • the angle A and radius r affect the initial insertion force and the force applied to the insulation.
  • the slot width f, radius r and dimension (a-b), determine both the amount of deformation of the conductor core and the bending or spreading or the legs 11 and 12, which both also depend upon the conductor size.
  • a typical material is phosphor bronze, of about .012" (3.05 mm) thickness.
  • the contact can be used with bare conductors. There may be reduced deformation of the beams, without the insulation, but the same basic situation occurs with deformation of the conductor occurring prior to entry into the slot 15. Similar structures can be used to retain small diameter rods or "wires" of other materials than metal, and it is possible to make the retaining member of non-metallic material, depending upon use.

Landscapes

  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Claims (5)

1. Halteteil mit doppelt wirkenden Vorspringenden Armen, bestehend aus einer Basis (13) und einem Paar vorspringender Arme, die sich von der Basis aus erstrecken und gegenüberliegende, mit Zwischenraum angeordnete innere Kanten haben, die im wesentlichen parallel verlaufen, wobei jeder Arm einen oberen Teil und einen unteren Teil sowie einen Eintrittsteil aufweist; jeder untere Teil wird von einer Aussenkante (16a, 16b), die sich von der Basis aus nach oben und nach innen zu verjüngt, und von einem unteren Teil der Innenkante (14) abgegrenzt; jeder obere Teil wird von einer Aussenkante (17a, 17b) abgegrenzt, die vom unteren Teil (11 a, 11 b) aus sich nach oben und aussen zu verjüngt, sowie von einem oberen Teil der Innenkante (14); der Eintrittsteil wird von oberen Kanten abgegrenzt, die von den Innenkanten aus (14) nach oben und nach aussen zu schräg verlaufen; gekennzeichnet durch einen Hals (18) bei jedem Arm (11 und 12), wobei der Hals (18) von dem Verbindungsstück der Aussenkanten (16a, 16b, 17a, 17b) der oberen und unteren Teile (11 a, 12a, 11b, 12b) und von der Innenkante (14) abgegrenzt wird, wobei die Hälse (18) bewirken, dass die oberen Teile (11b, 12b) im Verhältnis zu den unteren Teilen (11a, 12a) gekurvte Stellungen aufweisen, wobei die Anordnung derart ist, dass beim anfänglichen Eintritt eines zylindrischen Gliedes (26, 27) durch den Eintrittsteil und zwischen die oberen Teile (11b, 12b) die oberen Teile (11b, 12b) so ausgelegt sind, dass sie etwa bei den Hälsen (18) nach aussen zu abweichen, um eine permanente Verformung über die elastische Grenze des Materials des Halteteils hinaus zu erreichen, während sie anfänglich das zylindrische Glied (26) verformen, wobei eine weitergehende Einführung des zylindrischen Gliedes (26) zwischen die unteren Teile (11a, 12a) die unteren Teile veranlasst, ihre Form in geringerem Masse abweichen zu lassen als die oberen Teile, während das zylindrische Glied (26) in seine endgültige Gestalt verformt wird.
2. Halteteil gemäss Patentanspruch 1 zur Verwendung als Kontakt für die Aufnahme eines elektrischen Leiters dadurch gekennzeichnet, dass der Halteteil (10) aus elektrisch leitendem Material besteht.
3. Halteteil gemäss Patentanspruch 2 dadurch gekennzeichnet, dass die oberen Teile (11b, 12b) so ausgelegt sind, dass sie die Isolierung (27) auf dem Leiter (26) zerdrücken und eine Verformung des Leiters durchzuführen beginnen, wobei die Isolierung vom Leiter entfernt wird und der Leiter bei Durchtritt an den Hälsen (18) vorbei mindestens zum grösseren Teil verformt wird.
4. Halteteil gemäss Patentanspruch 1,2 bzw. 3, dadurch gekennzeichnet, dass die unteren Teile (11a, 12a) der Arme (11, 12) verjüngt sind, um für eine im wesentlichen gleichmässige Verteilung des Druckes bei der Einführung eines Leiters (26) zu sorgen.
5. Halteteil gemäss Patentanspruch 1, 2, 3 bzw. 4, dadurch gekennzeichnet, dass die oberen Teile (11b, 12b) in der Weise verformt werden, dass die Innenkanten (14) an den oberen Teilen in Richtung der Innenkante (14) an den unteren Teilen jedes Armes (11, 12) nach Einführung eines Leiters (26) schräg verlaufen.
EP19810104120 1980-07-03 1981-05-29 Kontaktglied zur mechanischen Sicherung mit zwei aktiven freitragenden Schenkeln Expired EP0043437B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA355309 1980-07-03
CA355,309A CA1115796A (en) 1980-07-03 1980-07-03 Retainer member with dual action cantilever beams

Publications (3)

Publication Number Publication Date
EP0043437A2 EP0043437A2 (de) 1982-01-13
EP0043437A3 EP0043437A3 (en) 1982-09-29
EP0043437B1 true EP0043437B1 (de) 1985-03-06

Family

ID=4117328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810104120 Expired EP0043437B1 (de) 1980-07-03 1981-05-29 Kontaktglied zur mechanischen Sicherung mit zwei aktiven freitragenden Schenkeln

Country Status (4)

Country Link
EP (1) EP0043437B1 (de)
JP (2) JPS5730274A (de)
CA (1) CA1115796A (de)
DE (1) DE3169168D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8506983A (pt) * 1984-10-17 1987-01-06 Amp Inc Processo e produto para terminacao com rasgo de solda selecionado
GB2198890B (en) * 1986-12-11 1992-01-08 Johnson Electric Ind Mfg A commutator for an electric motor
GB2202998A (en) * 1987-03-16 1988-10-05 Johnson Electric Ind Mfg A method of connecting an armature winding to a commutator
GB9002172D0 (en) * 1990-01-31 1990-03-28 Raychem Sa Nv Electrical connector
FR2659514A1 (fr) * 1990-03-07 1991-09-13 Cit Alcatel Cordon en y pour l'adjonction d'un ecouteur supplementaire a un poste telephonique non prevu pour en comporter un.
DE4403278C2 (de) * 1994-01-31 1997-12-04 Krone Ag Schneidklemm-Kontaktelement
US5797763A (en) * 1994-11-29 1998-08-25 Sumitomo Wiring Systems, Ltd. Electrical connection box

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE630034A (de) * 1962-03-26
US3521221A (en) * 1968-02-21 1970-07-21 Northern Electric Co Insulation slicing connector
US4084877A (en) * 1969-10-22 1978-04-18 The Siemon-Dynamic Mfg. Company Electrical connectors and terminal connecting block
JPS4964884A (de) * 1972-10-31 1974-06-24
US4027368A (en) * 1976-06-22 1977-06-07 Amp Incorporated Forceps tool for wire insertion
US4062614A (en) * 1976-07-30 1977-12-13 Bell Telephone Laboratories, Incorporated Insulation piercing slotted beam electrical connector
AU525919B2 (en) * 1979-01-22 1982-12-09 Amp Incorporated Flat cable connector

Also Published As

Publication number Publication date
JPH0355662U (de) 1991-05-29
EP0043437A2 (de) 1982-01-13
DE3169168D1 (en) 1985-04-11
CA1115796A (en) 1982-01-05
JPS5730274A (en) 1982-02-18
EP0043437A3 (en) 1982-09-29
JPH0414855Y2 (de) 1992-04-03

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