EP0282116B1 - Plastic branch terminal and coupling screw - Google Patents

Plastic branch terminal and coupling screw Download PDF

Info

Publication number
EP0282116B1
EP0282116B1 EP88200329A EP88200329A EP0282116B1 EP 0282116 B1 EP0282116 B1 EP 0282116B1 EP 88200329 A EP88200329 A EP 88200329A EP 88200329 A EP88200329 A EP 88200329A EP 0282116 B1 EP0282116 B1 EP 0282116B1
Authority
EP
European Patent Office
Prior art keywords
screw
main conductor
hole
coupling
coupling screw
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 - Lifetime
Application number
EP88200329A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0282116A1 (en
Inventor
Jan Simon Van Den Hout
Bartholomeus Johannes Kaptein
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.)
Lovink-Terborg BV
Original Assignee
Lovink-Terborg BV
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 NL8700482A external-priority patent/NL8700482A/nl
Application filed by Lovink-Terborg BV filed Critical Lovink-Terborg BV
Priority to AT88200329T priority Critical patent/ATE76227T1/de
Publication of EP0282116A1 publication Critical patent/EP0282116A1/en
Application granted granted Critical
Publication of EP0282116B1 publication Critical patent/EP0282116B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive 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
    • 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
    • H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
    • H01R4/2408—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation actuated by clamping screws

Definitions

  • the invention relates to a branch terminal for connecting at least one electrical branch conductor to a continuous electrical main conductor, which branch terminal comprises an electrically conducting contact block which can be clamped in a position by clamping means on said main conductor, with which block an electrically conducting coupling screw rotatable from outside co-operates by means of a threaded hole, whereby said clamping means support said main conductor on its side facing away from said coupling screw, and said contact block displays for each branch conductor a hole for receiving thereof and a screw rotatable from outside for fixing in place of that branch conductor in that hole, in which said clamping means consist of two separated U-shaped clamping parts which can be placed over said main conductor from two sides and are coupled to each other while enclosing said contact block, the clamping parts can be connected to each other by a snap coupling, comprising a plurality of snap edges following on from one another in the coupling direction of the clamping parts, such that the interval over which said clamping parts are coupled to each other can be selected.
  • Such a branch terminal is known from e.g. EP-A-0 067 917.
  • the branch terminal according to the invention is characterized in that the coupling screw can be placed in contact with said main conductor by rotation and that at least one of the legs of the clamping parts comprise a U-shaped structure with two legs of which the surfaces facing each other are provided with snap edges extending in transverse direction relative to the coupling direction and following on from one another in the coupling direction of clamping parts and which can co-operate for snapping with snap edges present on the leg of the other clamping part.
  • the invention is residing in the generally U-shaped structure of at least one of the legs of one of the clamping parts.
  • Such construction ensures a highly reliable snapping even under the high tensile forces exerted on the related legs when tightening the clamping screw.
  • the inner legs 21, 22 according to fig. 3 of EP-A-0 067 917 are not blocked for inward displacement which might occur when tightening screw 17.
  • Such construction might lead to the loosing of the snap connection between the co-operating teeth of the ends of the legs. This disadvantage is not present in the construction according to the invention.
  • the clamping parts can consist of a mechanically strong plastic, such as polyamide.
  • the plastic is preferably reinforced, for instance with glass fibres.
  • Various types of coupling may be considered suitable. Use can be made of a strong and quick drying adhesive or an ultrasonic weld treatment. The drawback here is that additional materials and equipment are needed at the workplace, which is often out in the open, and in varying weather conditions. Preference is therefore given to an embodiment in which the clamping parts can be connected to each other by a snap coupling. In this latter case a variant can be advantageously employed which displays the feature that the snap coupling comprises a number of snap edges following on from one another in the coupling direction of the clamping parts, such that the interval over which the clamping parts are coupled to each other can be selected. In this case the coupling interval can be chosen on the basis of the relevant cable diameter, which enables universal application of the branch terminal.
  • the variant is preferably used in which the clamping part supporting the main conductor displays a number of sharp projections, such as pyramids, cones, cross ribs or longitudinal ribs, the tops of which are positioned such that they can all be placed in contact with the main conductor by tightening of the coupling screw.
  • the branch terminal displays the feature that the coupling screw has a head which can be set in co-operation with the main conductor, this head having a cutter face and a stop collar.
  • a preferred embodiment of the branch terminal according to the invention displays the feature that the contact block is enclosed in one of the clamping parts, the coupling screw is rotatable via a through-hole present in that clamping part and that the wall part containing that hole is resilient such that after tightening of the coupling screw that wall part exerts an elastic force on the contact block, thus ensuring a permanent contact with a substantially constant contact force between the coupling screw and the main conductor.
  • the invention further relates to a method for manufacturing a coupling screw with a cutter face.
  • This method displays the feature that a screw is provided and a hole is drilled through the active leading end face thereof, at least a part of the edge of which hole can serve as cutting edge.
  • the method is preferably applied such that the drill is directed such that its central axis makes an angle with the central axis of the screw.
  • the method may have the feature that the drill is directed such that its central axis lies in the same plane as the central axis of the screw.
  • the method has the particular feature that a through-hole is drilled which extends between the leading end face of the screw and its outer envelope surface.
  • a hole is obtained with a non-round edge, for example, in the case of a flat leading end face of the screw, a hole the edge of which takes the form of an ellipse, the long side of which extends more or less radially, depending on the fact of whether both central axes lie in the same plane.
  • the invention also relates to a coupling screw obtained with the above described methods.
  • Fig. 1 shows a branch terminal 1 in a first embodiment of the invention. It comprises two U-shaped clamping parts 2 and 3 respectively, which are both manufactured of polyamide reinforced with glass fibre, which is obtainable on the market.
  • the use of such insulating material has the advantage that branch terminal 1 is completely insulated to the outside and can therefore if required be arranged on a main conductor carrying current.
  • Clamping parts 2 and 3 can be coupled with each other in the direction indicated with the arrows 4.
  • the legs of the U-shaped upper clamping part 2 each comprise once again a U-shaped structure with two legs 5, 6 of which the surfaces facing each other are provided with snap edges 7 running in transverse direction relative to the coupling direction 4 and following on from one another in the coupling direction 4 of clamping parts 2, 3 and which can co-operate for snapping with snap edges 9 present on the legs 8 of the lower clamping part 3.
  • the form of the respective snap edges is chosen such that the legs 8 of lower clamping part 3 can be inserted with some force into the space enclosed by the legs 5, 6 of the upper clamping part 2. The reverse movement is not possible because of the barb-like form of the snap edges.
  • the upper clamping part 2 has a form such that it can enclose a brass contact block 10. This is shown more clearly in the figures to be discussed later.
  • Upper clamping part 2 displays a through-hole 11 for passage of a coupling screw for coupling of the contact block 10 to a main conductor, and two through-holes 12, 13 for passage of two screws for fixing in position on the contact block of branch conductors.
  • Lower clamping part 3 has on its inner face, the portion intended for support of the main conductor, five sharply tapering longitudinal ribs 14, the tops of which are placed such that after arranging of the branch terminal and tightening of the coupling screw to be described hereinafter they are placed in contact with the main conductor.
  • Fig. 2 shows the branch terminal 1 in the situation where the two clamping parts 2 and 3, after having being placed from both sides over a main conductor 15 with insulating sheath 16, are connected to each other by means of the snap edges 7, 9.
  • Contact block 10 is provided with a threaded hole 17 which can be positioned coaxially with the through-hole 11 in the upper clamping part 2. A screw to be fitted in threaded hole 17 can thus be tightened from outside.
  • Threaded hole 17 is a through-hole, as is shown in fig. 3, so that coupling screw 18 can be tightened from outside.
  • the insulating sheath 16 is pierced by the relevant head of screw 18 so that screw 18 comes into contact with main conductor 15, so that a conducting contact results between this main conductor 15 and contact block 10.
  • Two through-holes 19, 20 extend in the direction of main conductor 15 and serve to receive the respective branch conductors 21, 22. These can be fixed in place by means of screws 23, 24 that can be tightened from outside.
  • the through-holes 12, 13 are in register with the threaded holes 25, 26 in the brass contact block 10 intended for the screws 23, 24.
  • a sector-shaped main conductor is applied which may for instance form part of a multi-core cable.
  • FIG. 4 shows however the manner in which a substantially constant contact force is ensured.
  • the corresponding elements are designated with the same reference numerals as in the previous figures.
  • a difference will be found in the coupling screw 27 which deviates from the coupling screw 18 according to the first embodiment discussed above in so far that screw 27 displays a cutter head 28 of relatively small diameter, while a stop collar 29 connects thereto. In this way a hole can be cut into main conductor 15, after which stop collar 29 then serves as a permanent pressure surface and can in addition form an indication of when to stop tightening of coupling screw 27.
  • the free upper face of coupling screw 27 is situated in the final position a little way beneath the outer surface of upper wall part 30. If desired the through-hole 11 may in that case be closed by means of a stopper (not drawn).
  • the branch terminal can also be fitted voltage-free by first coupling the branch conductors 21, 22 with contact block 10 by tightening of the screws 23, 24 and by only then connecting coupling screw 18 or 27 to main conductor 15.
  • Fig. 5 shows a coupling screw 31 of which the leading end face, i.e. the active surface to be placed in contact with main conductor 15, displays a cutting ege.
  • This cutting edge is a part of a through-hole 33 arranged by means of a symbolically designated drill 32.
  • the central axis of hole 33 and the central axis of screw 31 lie in the same plane and form an angle with each other.
  • the through-hole 33 extends between the leading end face 34 of screw 31 and the outer envelope surface thereof.
  • Fig. 6 shows the leading end face with the hole 33.
  • An arrow 35 shows the rotation direction of screw 31 during the fixing in position against main conductor 15. During this rotation the rearmost portion (designated with 36) of the edge of the hole 33 acts as cutting edge.

Landscapes

  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
EP88200329A 1987-02-26 1988-02-23 Plastic branch terminal and coupling screw Expired - Lifetime EP0282116B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88200329T ATE76227T1 (de) 1987-02-26 1988-02-23 Kunststoffabzweigklemme und kupplungsschraube.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL8700482A NL8700482A (nl) 1987-02-26 1987-02-26 Kunststof aftakklem.
NL8700482 1987-02-26
NL8701466A NL8701466A (nl) 1987-02-26 1987-06-23 Kunststof aftakklem en koppelschroef.
NL8701466 1987-06-23

Publications (2)

Publication Number Publication Date
EP0282116A1 EP0282116A1 (en) 1988-09-14
EP0282116B1 true EP0282116B1 (en) 1992-05-13

Family

ID=26646211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200329A Expired - Lifetime EP0282116B1 (en) 1987-02-26 1988-02-23 Plastic branch terminal and coupling screw

Country Status (5)

Country Link
EP (1) EP0282116B1 (nl)
DE (1) DE3870937D1 (nl)
ES (1) ES2031993T3 (nl)
GR (1) GR3004704T3 (nl)
NL (1) NL8701466A (nl)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2650706B1 (fr) * 1989-08-07 1992-09-04 Labinal Dispositif de raccordement d'un conducteur de derivation a un conducteur principal isole
FR2697376B1 (fr) * 1992-10-27 1994-12-02 Seifel Connecteur unipolaire du type à cage pour câble électrique.
FR2780556B1 (fr) * 1998-06-24 2000-09-15 App Mat Elect Const Accessoire de branchement pour cable derive a raccorder a un cable principal, et connecteur de derivation equipe d'un tel accessoire de branchement
EP0969552B1 (en) * 1998-07-02 2002-10-30 The Whitaker Corporation End cap for insulation piercing connectors
US6769941B2 (en) * 2002-11-05 2004-08-03 Eugene A. Norden Electrical connectors
DE102006037720A1 (de) * 2006-08-03 2008-02-07 Pfisterer Kontaktsysteme Gmbh & Co. Kg Vorrichtung zum elektrischen Verbinden von midestens zwei Hauptleitern eines Energieversorgungskabels, insbesondere Kabelabzweigklemme
CN105790191B (zh) * 2016-04-22 2018-08-21 广州番禺电缆集团有限公司 一种终端固线装置组件
US10570937B2 (en) 2017-01-10 2020-02-25 Sensorlink Corporation Clamp sensor systems and methods
CN113328306A (zh) * 2021-06-07 2021-08-31 贵州电网有限责任公司 一种临时电源快速接入装置
EP4443036A1 (de) * 2023-04-05 2024-10-09 Siemens Schweiz AG Achsaufnahme für einen luftklappendrehantrieb und luft-klappendrehantrieb

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE61078C (de) * M. SEEHOF in Cassel, Wolf hagerstr. 21 II Vorrichtung zur Verbindung isolirter elektrischer Leitungsdrähte
US3816817A (en) * 1972-12-15 1974-06-11 Pirelli General Cable Works Electrical connectors
DE2438003C3 (de) * 1974-08-07 1978-10-19 Wilhelm Petri Kg, Spezialfabrik Des Elektrofaches, 3550 Marburg Kontaktschraube mit Frässchlitz für elektrische Abzweigklemmen
DE3062720D1 (en) * 1979-07-07 1983-05-19 Eibes Kerb Konus Gmbh Thread cutting screw
EP0067917B1 (fr) * 1981-06-18 1985-08-28 MARS-ALCATEL Société anonyme dite: Dispositif de raccordement de câble isolé par perforation d'isolant
NL8303986A (nl) * 1983-11-18 1985-06-17 Ijzergieterij Lovink Bv Kabelaftakklem.

Also Published As

Publication number Publication date
NL8701466A (nl) 1988-09-16
GR3004704T3 (nl) 1993-04-28
ES2031993T3 (es) 1993-01-01
DE3870937D1 (de) 1992-06-17
EP0282116A1 (en) 1988-09-14

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