EP0763871B1 - Verbindungsklemme für elektrisches Gerät - Google Patents

Verbindungsklemme für elektrisches Gerät Download PDF

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Publication number
EP0763871B1
EP0763871B1 EP19960410093 EP96410093A EP0763871B1 EP 0763871 B1 EP0763871 B1 EP 0763871B1 EP 19960410093 EP19960410093 EP 19960410093 EP 96410093 A EP96410093 A EP 96410093A EP 0763871 B1 EP0763871 B1 EP 0763871B1
Authority
EP
European Patent Office
Prior art keywords
screw
recess
conductor
contact strip
cage
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
EP19960410093
Other languages
English (en)
French (fr)
Other versions
EP0763871A1 (de
Inventor
Manuel Cedron
André Deprez
Joel Fagnoul
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.)
Schneider Electric SE
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0763871A1 publication Critical patent/EP0763871A1/de
Application granted granted Critical
Publication of EP0763871B1 publication Critical patent/EP0763871B1/de
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
    • 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
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • H01R4/363—Conductive members located under tip of screw with intermediate part between tip and conductive member

Definitions

  • the invention relates to a connection terminal of an installation device.
  • electric comprising a cage provided with an opening intended to receive a conductor, a contact pad extending in said opening, intended to be connected to a electrical circuit of the device, and a clamping screw mounted in the cage to tighten the contact pad against the conductor, the contact pad comprising a recess arranged opposite the end of the screw, so that the end of the screw can engage in said recess during tightening.
  • a connection terminal of an installation device comprising a cage provided with an opening intended to receive a conductor, a contact pad extending in said opening, intended to be connected to a electrical circuit of the device, and a clamping screw mounted in the cage to tighten the contact pad against the conductor, the contact pad comprising a recess arranged opposite the end of the screw, so that the end of the screw can engage in said recess during tightening.
  • FR-A-1 566 270 Such a device is described for example by FR-A-1 566 270
  • An electrical installation device must be capable of being electrically connected to using rigid or flexible conductors of very different diameters. This requirement comes either from installation practice or from national standards and international.
  • the device often has terminals associated with contact pads intended to supply the various functions of the device; these terminals and contact pads are located in the device generally by mounting on an insulating box.
  • the operator acts usually on a screw using a manual or motorized screwdriver and therefore exercises mechanical forces on the device.
  • the contact pads must be sized for large conductors and when wants to clamp a small diameter conductor, it can be indifferently left, middle or right of the free space or in any other position intermediate. These driver positions lead to load distributions which do not are not favorable to good mechanical strength of the constituents and which cause relative displacements between the contact pad and the terminal cage, as we will describe it in detail later. These displacements create parasitic forces in the housing.
  • the housings are subjected to efforts abnormal which can cause rupture or unacceptable deformation. For reasons of space, these boxes cannot be reinforced in addition measured.
  • the present invention aims to avoid the problems mentioned above, by preventing a relative displacement capable of creating parasitic forces between the cage of the terminal, the contact pad and the housing or other structure supporting the terminal.
  • connection terminal according to the invention is characterized in that said recess is formed by a countersink formed in a reinforcing element fixed on the contact range.
  • the contact area is retained longitudinally and transversely by the screw engaged in the corresponding recess.
  • the clamping pressure is exerted mainly near an edge of the end of the screw because the conductor is offset on that side, the thrust resulting longitudinal is absorbed in the recess itself and does not therefore not transmitting outside the terminal.
  • the contact area cannot practically not move longitudinally relative to the cage.
  • the recess is cylindrical and can have a diameter substantially equal to the diameter of the end of the screw.
  • the housing can be conical or frustoconical.
  • FIGS. 1 and 2 represent a connection terminal 1 according to the prior art, comprising a metal cage 2 traversed longitudinally by an opening 3 and provided with a lower flap 4 in the form of a bib preventing the introduction wrong cable under the terminal when screwing.
  • a clamping screw 5 having a part threaded 6 is engaged in a threaded bore 7 of the cage 2 and has a cylindrical end 8 inside the opening 3, where this end 8 is intended to press together a conductor 9, a contact pad 10 and an element reinforcement 11 fixed on the pad 10 and called "beach pad".
  • the contact range 10 is formed by the end of a conductive strip extending inside of the device and fixed directly or indirectly to the housing.
  • Driver 9 is intended to electrically connect the contact pad 10 to an external circuit to the device.
  • the conductor 9 is generally offset laterally relative to the axis, so that the integral elements 10 and 11 tend to tilt sideways when tightening the screw. It follows that the end 8 of the screw exerts its axial tightening force on element 11 essentially on a surface 13 which is offset laterally with respect to the axis 12. Due to the rotation of the screw, this surface 13 moves tangentially in the direction longitudinal of the opening 3, so that it frictionally drives the element of reinforcement 11 and the contact pad 10 which is linked to it. This phenomenon tends to produce a longitudinal movement D1 of the cage 2 and / or a longitudinal movement opposite D2 of the contact pad 10, that is to say a relative displacement D between these two elements, which moreover are generally linked to the housing of the device. It is as well as tightening the screw 5 generates the parasitic forces mentioned in the introduction.
  • connection terminal 21 In the embodiment of the invention shown in Figures 3 to 5, the most of the components of the connection terminal 21 are similar to those of the terminal 1 described above, and this is why they have the same reference. This is particularly the case for cage 2, screw 5 and the contact pad 10. On the other hand, the reinforcing element 22 is different from the element 11, as can be see it in more detail in Figures 5 and 6.
  • Terminal 21 is preferably of the type movable cage, that is to say that the cage 2 can move in the direction of the screw 5 when you operate the screw.
  • the reinforcing element 22 is made of hardened steel, and is shaped according to a plate generally rectangular, fixed for example by crimping or welding to the beach contact 10.
  • a cylindrical recess 23 is formed, for example by countersinking or stamping, and it is fitted with gentle friction on the end 8 of the screw 5.
  • the recess 23 extends for example over approximately the half the thickness of the element 22.
  • lateral horns 24 are provided at the ends of the longitudinal edges of the element 22, to constitute stops abutting the vertical edges 25 and 26 of the cage 2 if the element dislodges accidentally screw 5 before it is tightened.
  • FIG. 5 shows in particular the operation of the device during tightening, where the screw 5 exerts a clamping force F under the action of the torque C that the operator applies to him.
  • the end 8 of the screw is engaged in the recess 23 and applies the force F at the bottom of it.
  • the contact pad 10 and its element reinforcement 22 tend to tilt laterally. Consequently, the force F is applied almost only in an eccentric area 27 where friction tends to drive the reinforcing element longitudinally 22.
  • the side wall of the cylindrical recess 23 abuts against the cylindrical lateral surface of the end 8 of the screw and thus prevents relative movement between the reinforcing element 22 and the cage 2. Consequently, the contact pad 10 and the conductor 9 do not move not, and the parasitic efforts which could result therefrom are avoided.
  • the present invention is not limited to the embodiment described above, but extends to any modification or variant obvious to a person skilled in the art.
  • the shape of the recess 23 and of the end 8 of the screw is not necessarily cylindrical and could for example be conical or other. If a reinforcing element is not provided, the recess is provided in the contact range 10 proper.
  • a housing for the end of the screw could be defined on element 22 by protruding parts stamped or folded.
  • Such a terminal can be used on any type of installation device electric. It can be of the fixed or mobile cage type.

Landscapes

  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)

Claims (4)

  1. Anschlußklemme für ein elektrisches Schaltgerät, die einen Käfig (2) mit einer Öffnung (3) zur Aufnahme eines Leiters (9), eine in der genannten Öffnung angeordnete Anschlußfahne (10) zum Anschluß an einen Stromkreis des Schaltgeräts und eine derart in den Käfig eingesetzte Klemmschraube (5) umfaßt, daß ein Ende (8) der Schraube die Anschlußfahne gegen den Leiter pressen kann, wobei die Anschlußfahne (10) eine dem Ende (8) der Schraube gegenüber liegende Ausnehmung (23) aufweist, derart daß das Ende (8) der Schraube beim Festziehen in die genannte Ausnehmung (23) eingreifen kann, dadurch gekennzeichnet, daß die genannte Ausnehmung (23) durch Senken in einem, auf der Anschlußfahne (10) befestigten Verstärkungselement (22) ausgebildet ist.
  2. Klemme nach Anspruch 1, dadurch gekennzeichnet daß sich die genannte Ausnehmung (23) über einen Teil der Dicke des aus Stahl bestehenden Verstärkungselements (22) erstreckt.
  3. Klemme nach Anspruch 1, dadurch gekennzeichnet daß die genannte Ausnehmung (23) zylindrisch ausgebildet ist, wobei der Durchmesser annähernd dem Durchmesser des Endes (8) der Schraube entspricht.
  4. Klemme nach Anspruch 1, dadurch gekennzeichnet daß die genannte Ausnehmung kegel- oder kegelstumpfförmig ausgebildet ist.
EP19960410093 1995-09-13 1996-08-28 Verbindungsklemme für elektrisches Gerät Expired - Lifetime EP0763871B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510799A FR2738675B1 (fr) 1995-09-13 1995-09-13 Borne de raccordement d'un appareil d'installation electrique
FR9510799 1995-09-13

Publications (2)

Publication Number Publication Date
EP0763871A1 EP0763871A1 (de) 1997-03-19
EP0763871B1 true EP0763871B1 (de) 1999-04-14

Family

ID=9482557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960410093 Expired - Lifetime EP0763871B1 (de) 1995-09-13 1996-08-28 Verbindungsklemme für elektrisches Gerät

Country Status (4)

Country Link
EP (1) EP0763871B1 (de)
DE (1) DE69602065T2 (de)
ES (1) ES2132859T3 (de)
FR (1) FR2738675B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10446953B1 (en) 2018-06-07 2019-10-15 RabyConnectInc. Electrical connector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH238217A (fr) * 1943-11-26 1945-06-30 Gardy Particip App Serre-câbles.
DE1123725B (de) * 1952-08-15 1962-02-15 Licentia Gmbh Klemme zum gleichzeitigen Verklemmen mehrerer Leitungen gleichen Querschnitts
FR1566270A (de) * 1968-01-18 1969-05-09
FR2038410A1 (de) * 1969-04-12 1971-01-08 Bassani Spa
US4103986A (en) * 1977-09-12 1978-08-01 Thomas & Betts Corporation Electrical terminal

Also Published As

Publication number Publication date
EP0763871A1 (de) 1997-03-19
DE69602065T2 (de) 1999-11-18
FR2738675A1 (fr) 1997-03-14
DE69602065D1 (de) 1999-05-20
FR2738675B1 (fr) 1997-10-24
ES2132859T3 (es) 1999-08-16

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