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EP0586312B1 - Elektrischer Apparat mit Anschlussklemme - Google Patents

Elektrischer Apparat mit Anschlussklemme Download PDF

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Publication number
EP0586312B1
EP0586312B1 EP19930420342 EP93420342A EP0586312B1 EP 0586312 B1 EP0586312 B1 EP 0586312B1 EP 19930420342 EP19930420342 EP 19930420342 EP 93420342 A EP93420342 A EP 93420342A EP 0586312 B1 EP0586312 B1 EP 0586312B1
Authority
EP
European Patent Office
Prior art keywords
terminal
protuberance
terminal pad
face
tunnel
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
EP19930420342
Other languages
English (en)
French (fr)
Other versions
EP0586312A1 (de
Inventor
Noel Le Corre
Michel Lazareth
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 EP0586312A1 publication Critical patent/EP0586312A1/de
Application granted granted Critical
Publication of EP0586312B1 publication Critical patent/EP0586312B1/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 present invention relates generally to an electrical apparatus comprising at least one terminal provided with a clamping screw and intended to establish a connection with an electrical cable.
  • phase and neutral electrical circuit breakers have the disadvantage that the person carrying out the installation of these electrical devices must actuate the terminal clamping screws, for example using a screwdriver, in order to establish or remove the connection of the electric cables with these terminals.
  • a drawback lies in the fact that the actuation of the clamping screws causes mechanical stresses in the casing of the electrical equipment, and it has frequently been observed that a certain number of failures or deteriorations of the electrical equipment have the cause excessive forces applied to the screws, in particular too high a tightening torque.
  • terminal which comprises a first part, hereinafter called “terminal cage”, constituted by a wall forming inside a cable housing, a second part, hereinafter called” clamping screw “, screwed radially through this wall, and a third part, hereinafter called” range of terminal ", part of which is housed in the cable housing, against the end of the clamping screw, and another part of which extends outside the terminal cage and is electrically connected to an electrical element of the electrical equipment.
  • terminal cage constituted by a wall forming inside a cable housing
  • clamping screw screwed radially through this wall
  • third part hereinafter called” range of terminal ", part of which is housed in the cable housing, against the end of the clamping screw, and another part of which extends outside the terminal cage and is electrically connected to an electrical element of the electrical equipment.
  • a stripped end of an electric cable can be put in the cable housing and the tightening of the clamping screw causes this cable end to be wedged between the terminal pad and the part of the wall of the terminal cage which is located opposite to the clamping screw.
  • Such a terminal has the advantage that the axial tightening force of the tightening screw is canceled out by a reaction force which is exerted in the terminal cage. It follows from this that the entire terminal does not communicate the axial clamping force to the part or parts which support and hold this terminal in place.
  • the tightening or loosening torque that a person exerts on the tightening screw, for example using a screwdriver, to cause the tightening screw to lock or unlock is a torque which is communicated by made to the entire terminal, and this couple necessarily causes an equal and opposite reaction torque at the level of the part or parts which serve to support and fix the terminal.
  • This part or these terminal support parts are generally constituted by parts of the casing of the electrical apparatus, that is to say by parts which are generally made of plastic and which are consequently relatively weak in mechanical resistance. This low mechanical resistance of this part or these terminal support parts appears in particular in miniaturized electrical equipment, for example in phase and neutral electrical circuit breakers.
  • the width of the circuit breaker is relatively small, for example around 10 to 15 mm, and in this width, we must have side by side the two disjunction mechanisms (one for the phase and one for the neutral), a central insulating partition, hereinafter called “partition”, used to separate the two mechanisms as well as two external lateral insulating walls, hereinafter called “side walls”, used to form the circuit breaker housing.
  • partition central insulating partition
  • each terminal has small dimensions and it is housed in a terminal housing formed in the housing of the electrical equipment, this terminal housing generally having substantially the same dimensions than the external dimensions of the terminal, so that the terminal is housed in this terminal housing with a slight play in all directions.
  • each terminal is preferably housed between one of the side walls and the partition. In practice, it is only the terminal cage which is thus supported in the terminal housing. Under these conditions, it is understood that the tightening or loosening torque causes significant reaction forces at the terminal housing because the terminal cage then rests in almost point areas of this terminal housing and because these zones are relatively close to each other due to the small dimensions of the terminal cage.
  • reaction torque which is equal and opposite to the tightening or loosening torque
  • these reaction forces at the level of the housing are consequently very large and they are exerted at the level of relatively thin parts of the housing, in particularly at the level of zones of the side walls and zones of the partition which are in contact with the terminal cage.
  • these side walls and this partition are generally thin and made of plastic, it is understandable that it has frequently been observed breaks, cracks or deterioration in these walls, this greatly reducing the reliability of these electrical devices after their installation.
  • Document DE-A-2511385 relates to an electrical apparatus in which a terminal comprises a terminal cage, a terminal strip arranged in the terminal cage and a clamping screw screwed into the terminal cage, so that a cable can be placed in the terminal cage between an internal contact face of this terminal cage and a contact face of the terminal pad and can be tightened or loosened between these two contact faces due to the tightening or loosening of the tightening screw, said terminal pad being constituted by a metal part having the general shape of an elongated plate comprising a protuberance which cooperates with a stop formed in an insulating part forming a part of a casing of the electrical equipment, said protrusion being separated from the tightening screw, whereby a tightening or loosening torque (C) which is applied to the tightening screw results in a reaction torque of said housing s ur the terminal which is exerted in part at the contact between said stop and said protuberance.
  • C tightening or loosening torque
  • the protrusion is formed by an extension of the terminal area, which engages in a lumen located in the same compartment and without passing through the partition between two adjacent compartments of a multipolar connection device.
  • the projection surface of the protuberance in the light is reduced, which imposes quite significant thicknesses at the level of the partition walls.
  • An object of the present invention is to provide an electrical apparatus comprising at least one terminal fixed to a housing of the electrical apparatus, this electrical apparatus having good mechanical resistance when a significant torque is applied to a clamping screw of the terminal .
  • Another object of the invention consists in producing such electrical equipment which can constitute a miniaturized module.
  • Another object of the invention consists in producing such an electrical apparatus which can constitute a phase and neutral electrical circuit breaker with reduced bulk.
  • the apparatus according to the invention is characterized in that said stopper is formed laterally in a partition partition arranged between two adjacent compartments of the housing, said partition partition comprising a substantially flat wall portion which has a first face and a second face. opposite to the first face, and in that said stop is constituted by a protruding part which extends laterally outward from said first face, this protruding part comprising a blind recess projecting from said second face, and in which fits said protuberance of the terminal range.
  • the dimensions of said protuberance of the terminal range and of said blind recess are such that said protuberance of the terminal range fits into said blind recess with a certain tightening.
  • said abutment is formed at a part of the partition which has a thickness greater than the thickness of another part of the partition which is in contact with the terminal cage.
  • a proximal part of the terminal pad which is housed in a housing of the terminal cage further comprises a support beam which is rigidly fixed on this proximal part so that the tightening screw comes to bear on the beam, this beam thus serving to increase the rigidity of the terminal range and to distribute the pressure force of the clamping screw.
  • FIGS. 1 and 2 there is a general distinction between electrical equipment 1 which, in the example shown, corresponds to an electrical phase and neutral circuit breaker.
  • the electrical equipment 1 comprises a box 2 which comprises a phase compartment 3 and a neutral compartment 4. These two compartments 3 and 4 are separated by a partition 5.
  • the phase compartment 3 is intended to include a mechanism (shown partially and schematically in thin lines) of disjunction of a phase
  • the neutral compartment 4 is intended to include a mechanism (shown partially and shematically in thin lines) of disjunction of a neutral.
  • the entire housing 2, including the partition wall 5, is made of insulating material, for example a molded plastic.
  • terminals In such electrical equipment 1, a certain number of terminals should be provided (only one being shown in the figures), for example an input terminal and an output terminal for the phase and an input terminal and a terminal output for neutral. These terminals can be arranged in an identical or similar manner and, for this reason, it does not will be described later only one of these terminals.
  • a terminal can be made so as to comprise a terminal cage 8, a terminal pad 9 disposed in the terminal cage 8 and a clamping screw 10 screwed into the cage terminal, so that a cable 11 can be placed in the terminal cage 8 between an internal contact face 12 of this terminal cage 8 and a contact face 13 of the terminal pad 9 and can be tightened or loosened between these two contact faces 12, 13 due to the tightening or loosening of the tightening screw 10.
  • the tightening screw has thus been screwed until it is locked so as to connect the cable 11, the assembly constituted by the terminal cage 8, the terminal pad 9 and the screw 10 form a single block. Under these conditions, a tightening torque C or a loosening torque applied to the screw 10, for example by means of a screwdriver, is transmitted to the entire terminal, and this torque causes a reaction torque of said box 2 on the terminal.
  • this reaction torque is exerted only between the housing 2 and certain parts of the external surface of the terminal cage 8.
  • this terminal cage 8 has a relatively small width L1, by example of approximately 3 to 5 mm, the reaction forces of the housing 2 on opposite parts of the terminal cage 8 are relatively large since these reaction forces are equal to the reaction torque divided by the width L1.
  • the terminal pad 9 is constituted by a metal plate of generally elongated shape which has a proximal part 15 which is intended to be received in the terminal cage 8 and a distal part 16 which is relatively distant, for example about 3 to 15 mm from the clamping screw 10, and which is intended to be connected, for example by welding, to an electrical part (not shown ) of the disjunction mechanism (not shown).
  • the terminal pad 9 further comprises, at its distal part 16, a lateral protuberance 17. This lateral protuberance 17 is intended to come into abutment against a corresponding abutment part 18 formed in one of the parts of the housing 2 of electrical equipment.
  • such a stop 18 is formed in the partition wall 5 of the housing 2, as can be seen in FIG. 2.
  • This partition wall 5 comprises a substantially flat wall portion 20 which has a first face 21 and a second opposite face 22.
  • the stop 18 is constituted by a protruding part 24 which extends radially outwards from the first face 21, this protruding part 24 comprising a blind recess 25 which opens at the second face 22 and which has a concave shape which substantially matches the convex shape of the protuberance 17 of the terminal area 9.
  • the distance L2 which separates the distal end of the protuberance 17 of the proximal end of the pad 9 can be much greater than the width L1 of the terminal cage 8.
  • a characteristic of the range 9 is that that the protuberance 17 of the terminal range 9 is relatively distant from the axis X of the clamping screw 10, in order to support a torque C most important.
  • track 9 can be described otherwise by saying that the distal end of the protrusion 17 of track 9 is located at a distance from the axis X of the tightening screw 10 greater than the distance from l lateral end 31 of the terminal cage 8 with respect to this same axis X of the clamping screw 10.
  • the stop 18 can be provided in an area of the partition 5 which is relatively distant from the terminal cage 8 and which can be located in a part of the electrical equipment in which there is more large space, and therefore we can realize the stopper 18 more mechanically strong because there is more space.
  • the arrangement of the protuberance 17 and the stopper 18 also has another advantage which resides in the fact that it is possible to embed with zero or minimum clearance of the protuberance 17 in the recess 25 of the stopper 18 , and this provides a good mechanical connection between the protuberance 17 and the stop 18 which further improves the mechanical strength of these parts.
  • the arrangement of the protrusion 17 and the stopper 18 also has another advantage which will now be explained.
  • part of its mounting is facilitated by the presence of the protuberance 17 and the stopper 18.
  • the dimensions of the protuberance 17 and of the blind recess 25 are such that the protrusion 17 fits into the blind recess 25 with a certain tightening which is, preferably just enough to allow the terminal range 9 to be maintained on the housing 2 during the following operations of mounting the electrical equipment.
  • a proximal part 15 of the terminal pad which is housed in a housing of the terminal cage 8 further comprises a support beam 34 which is rigidly fixed on this proximal part 15 so that the clamping screw 10 comes to bear on the beam 34, this beam 34 thus serving to increase the rigidity of the terminal range 9 and to distribute the pressure force of the clamping screw.
  • the terminal pad 9 is made of copper or a copper alloy and the beam 34 is of planar shape and made of steel.
  • the beam 34 is crimped onto the proximal part 15 of planar shape of the pad 9.

Landscapes

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

Claims (6)

  1. Elektrisches Schaltgerät (1), bei dem eine Klemme einen Klemmenkäfig (8), einen im Klemmenkäfig (8) angeordneten Klemmbügel (9) sowie eine in den Klemmenkäfig (8) eingedrehte Klemmschraube (10) umfaßt, derart daß ein Kabel (11) zwischen eine innere Kontaktfläche (12) dieses Klemmenkäfigs und eine Kontaktfläche (13) des Klemmbügels in den Klemmenkäfig eingeführt und durch Anziehen oder Lösen der Klemmschraube (10) zwischen diesen beiden Kontaktflächen (12, 13) festgeklemmt oder freigegeben werden kann, wobei der genannte Klemmbügel (9) aus einem Metallteil besteht, das im wesentlichen als längliche Platte mit einem Ansatz (17) ausgebildet ist, der mit einem, in einem Isolierstoffteil (5), welches einen Teil eines Gehäuses (2) des elektrischen Schaltgeräts darstellt, ausgebildeten Anschlag (18) zusammenwirkt, wobei der genannte Ansatz (17) von der Klemmschraube entfernt angeordnet ist, so daß ein auf die Klemmschraube (10) ausgeübtes Anzieh- bzw. Losdrehmoment (C) ein auf die Klemme ausgeübtes Gegenmoment des genannten Gehäuses (2) hervorruft, welches teilweise auf die Berührungsstelle zwischen dem genannten Anschlag (18) und dem genannten Ansatz (17) wirkt, dadurch gekennzeichnet, daß
       der genannte Anschlag (18) seitlich in einer, zwischen zwei aneinandergrenzen Abteilen des Gehäuses (2) angeordneten Trennwand (5) ausgebildet ist, wobei die genannte Trennwand (5) einen annähernd geradlinigen Wandabschnitt (20) umfaßt, der eine erste Seite (21) sowie eine, der ersten Seite gegenüberliegende zweite Seite (22) aufweist, und daß der genannte Anschlag (18) durch einen, von der genannten ersten Seite (21) seitlich nach außen geführten, hervorspringen Abschnitt (24) gebildet wird, wobei dieser hervorspringende Abschnitt eine Blindausnehmung (25) aufweist, die über die zweite Seite (22) hinausragt und in die der genannte Ansatz (17) des Klemmbügels eingreift.
  2. Elektrisches Schaltgerät nach Anspruch 1, dadurch gekennzeichnet, daß das Schaltgerät als einpoliger Leistungsschalter mit Neutralleiter ausgebildet und die genannte Trennwand (5) zwischen einem Phasenleiterabteil (3) und einem Neutralleiterabteil (4) angeordnet ist.
  3. Elektrisches Schaltgerät nach Anspruch 2, dadurch gekennzeichnet, daß die Blindausnehmung (25) eine Hohlform aufweist, die sich annähernd an die erhabene Form des genannten Ansatzes (17) des Klemmbügels (9) anschmiegt, so daß die Montage des Klemmbügels durch Einsetzen des genannten Ansatzes (17) des Klemmbügels in die genannte Blindausnehmung (25) erfolgen kann.
  4. Elektrisches Schaltgerät nach Anspruch 3, dadurch gekennzeichnet, daß die Abmessungen des genannten Ansatzes (17) des Klemmbügels und der genannten Blindausnehmung (25) so bemessen sind, daß der genannte Ansatz des Klemmbügels mit einer gewissen Klemmwirkung in die genannte Ausnehmung eingreift.
  5. Elektrisches Schaltgerät nach Anspruch 1, dadurch gekennzeichnet, daß der genannte Anschlag (18) in einem Abschnitt (32) der Trennwand (5) ausgebildet ist, der eine größere Dicke aufweist als ein anderer Abschnitt (33) der Trennwand (5), welcher mit dem Klemmenkäfig (8) in Berührung steht.
  6. Elektrisches Schaltgerät nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein, in einer Aufnahme des Klemmenkäfigs (8) angeordneter naher Bereich (15) des Klemmbügels zusätzlich eine Stützauflage (34) umfaßt, die biegesteif auf diesem nahen Bereich (15) befestigt ist, derart daß sich die Klemmschraube (10) auf der Auflage (34) abstützt und diese Auflage auf diese Weise dazu dient, die Biegesteifigkeit des Klemmbügels (9) zu erhöhen und die Druckkraft der Klemmschraube zu verteilen.
EP19930420342 1992-09-02 1993-08-17 Elektrischer Apparat mit Anschlussklemme Expired - Lifetime EP0586312B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9210549 1992-09-02
FR9210549A FR2695258B1 (fr) 1992-09-02 1992-09-02 Borne de connexion pour appareillage électrique.

Publications (2)

Publication Number Publication Date
EP0586312A1 EP0586312A1 (de) 1994-03-09
EP0586312B1 true EP0586312B1 (de) 1997-01-15

Family

ID=9433197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930420342 Expired - Lifetime EP0586312B1 (de) 1992-09-02 1993-08-17 Elektrischer Apparat mit Anschlussklemme

Country Status (4)

Country Link
EP (1) EP0586312B1 (de)
DE (1) DE69307434T2 (de)
ES (1) ES2097475T3 (de)
FR (1) FR2695258B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2799312B1 (fr) * 1999-10-01 2001-12-14 Michaud Sa Borne de connexion electrique
GB2355863B (en) * 1999-10-27 2001-09-12 Philex Plc Electrical earth connector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2193202A (en) * 1939-03-13 1940-03-12 Cutler Hammer Inc Wiring-terminal device
DE2511385C3 (de) * 1975-03-15 1978-03-30 Phoenix Elektrizitaetsgesellschaft H. Knuemann & Co, 4933 Blomberg Elektrische Anschlußklemme
FR2535534A1 (fr) * 1982-10-27 1984-05-04 Merlin Gerin Dispositif de raccordement par serrage mecanique d'un cable ou d'une barre de connexion a une plage de contact d'un appareil electrique

Also Published As

Publication number Publication date
FR2695258A1 (fr) 1994-03-04
FR2695258B1 (fr) 1994-10-28
EP0586312A1 (de) 1994-03-09
DE69307434T2 (de) 1997-06-12
DE69307434D1 (de) 1997-02-27
ES2097475T3 (es) 1997-04-01

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