EP1746619A1 - Clamping auxiliary element - Google Patents

Clamping auxiliary element Download PDF

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Publication number
EP1746619A1
EP1746619A1 EP06019161A EP06019161A EP1746619A1 EP 1746619 A1 EP1746619 A1 EP 1746619A1 EP 06019161 A EP06019161 A EP 06019161A EP 06019161 A EP06019161 A EP 06019161A EP 1746619 A1 EP1746619 A1 EP 1746619A1
Authority
EP
European Patent Office
Prior art keywords
box
frame
opening
housing
clamping 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.)
Granted
Application number
EP06019161A
Other languages
German (de)
French (fr)
Other versions
EP1746619B1 (en
Inventor
Gerhard Schuh
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.)
Eaton Industries Austria GmbH
Original Assignee
Moeller Gebaudeautomation GmbH
Eaton GmbH
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 Moeller Gebaudeautomation GmbH, Eaton GmbH filed Critical Moeller Gebaudeautomation GmbH
Publication of EP1746619A1 publication Critical patent/EP1746619A1/en
Application granted granted Critical
Publication of EP1746619B1 publication Critical patent/EP1746619B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/08Terminals; Connections
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00Electrically-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
    • H01R4/28Clamped connections, spring connections
    • H01R4/30Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36Conductive members located under tip of screw
    • H01R4/363Conductive members located under tip of screw with intermediate part between tip and conductive member
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/58Electric connections to or between contacts; Terminals
    • H01H1/5855Electric connections to or between contacts; Terminals characterised by the use of a wire clamping screw or nut
    • H01H2001/5861Box connector with a collar or lug for clamping internal rail and external conductor together by a tightening screw
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00Electrically-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
    • H01R4/28Clamped connections, spring connections
    • H01R4/30Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/34Conductive members located under head of screw
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00Electrically-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
    • H01R4/28Clamped connections, spring connections
    • H01R4/38Clamped connections, spring connections utilising a clamping member acted on by screw or nut

Definitions

  • the invention relates to a lift clamp for installation in a housing of an electrical device, such as a circuit breaker, comprising a rectangular frame and a rectangular box, the upper portion between the upper portion and the lower portion of the frame is arranged, whereby the box slidably in the frame further comprising a clamping screw freely rotatably guided through an aperture formed in the upper frame portion and threaded into an upper portion of the box, and a tab fixed to the box extending from the lower portion of the box extends into the space lying below the box and parallel to the plane of an adjacent to the lift clamp opening in the housing.
  • Such lift clamps with fixed to the box lobes or shutters are for example from the EP 0 559 585 A and the US 5 580 285 A known.
  • a disadvantage of the EP 0 559 585 A proves that the tab shown there is integrally formed with the metallic box and thus does not provide an electrically insulating protection.
  • the US 5 580 285 A whereas, in a particular embodiment, shows a removable shutter. However, this shutter is attached only with small hooks on the box, so that the resulting low composite surface ensures no secure connection.
  • the object of the invention is therefore to securely connect a cloth to cover the lower receiving space with the box. According to the invention this is achieved in that a parallel to the lower box section extending plate is formed on the lobes, by means of which the flap is connected to the box. The section of the opening below the lower box section is covered thereby, thus avoiding erroneous insertion of ladders under the lower box section.
  • the plate allows a relatively large-area contact with the box, thus ensuring a secure connection.
  • a mounting plate running both normal to this and normal to the flap is integrally formed, which is firmly connected to a side wall of the box.
  • a pin is formed on the mounting plate, which engages in an incorporated into the box side wall opening.
  • the shear bolt in addition to its main function of providing resistance to displacement of the box, it can fulfill the auxiliary function of holding mounting plates, plates and lobes in the housing.
  • mounting plates, plates and lobes can be mechanically inserted into the lower shell.
  • the circuit breaker shown in Figure 1 comprises two, as so-called. "Lift terminals" running screw 1, by means of which lead wires and the comb-like terminal lugs of busbar systems can be connected to the circuit breaker.
  • the circuit breaker further comprises an overload trip element 2 and a short-circuit tripping device 3, next to a switching mechanism 4, which can move the movable contact 5 from a closed position in which the movable contact 5 is applied to the fixed contact 8 in the open position shown in Figure 1 ,
  • the current to be monitored flows through in this circuit breaker, starting from the right screw 1, first the overload trip element 2, passes through a movable Lciterseil 6 and the switching bridge 7 to the movable contact 5, then via the fixed contact 8 to the short tripping device 3 and finally to the second terminal.
  • the switching mechanism 4 can be actuated both by the short-circuit tripping device 3 and by the overload tripping element 2.
  • the short-circuit tripping device 3 is formed in a conventional manner by a magnetic coil with a movable armature, which beats anchor at correspondingly high short-circuit currents on the switching bridge 7 of the switching mechanism 4.
  • the overload release element 1 consists of a bimetallic strip which is heated by the current to be monitored. The first end 21 of the bimetallic strip is fixed in the housing of the circuit breaker, the second end 22 is held freely movable. The bending thereof caused by the heating of the bimetal therefore leads to a movement of the second end 22 in the direction of the arrow 23.
  • the contact carrier 7 in the closed position of the movable contact 5 is provided accessible from the outside, manually operable lever 11.
  • the housing of the circuit breaker is in a conventional manner in two parts, consisting of the respectively apparent in the drawing figures lower shell 12 and not shown in the drawings, with respect to its structural design to the lower shell 12 mirror image of the upper shell executed.
  • the present invention relates to the lift clamps 1 and is not limited to the use of these lift clamps 1 in circuit breakers.
  • a line protection switch or the lower shell 12 of such was shown, because herein is a particularly preferred application of the lift clamp 1.
  • it can nevertheless be used in electrical appliances of any type, that is to say, for example, in the case of a residual current circuit breaker, arrester isolating switch, staircase automaton, etc.
  • the lift clamp 1 has, as previously known screw terminals of this type, a frame 14 which, viewed in the position shown in FIG. 1, is rectangular. It usually consists of a one-piece, three times 90 ° angled copper strip. This frame 14 is immovably held in the housing, which can be achieved for example by clamping between projections on the lower shell inner wall.
  • Second main component of a lift clamp 1 is the box 15, which is also frame-like (see also Fig.2). The box 15 is rotated by 90 ° relative to the frame 14 and hung in this, ie, the upper portion 150 of the box 15 is located between the upper portion 140 and the lower portion 141 of the frame 14.
  • the box 15 is thus slidably guided in the frame 14 ,
  • the third main component of the lift clamp is the clamping screw 16.
  • the upper portion 140 of the frame 14 has an opening 142 through which the clamping screw 16 is freely rotatably guided.
  • a thread 152 is incorporated, in which the clamping screw 16 engages. If the clamping screw 16 is rotated in the closing direction (ie clockwise when the clamping screw 16 is designed as a right-hand screw), the box 15 is lifted, ie moved in the direction of the upper frame section 140. This shift is due to the fact that the clamping screw 16 with its foot-side end on the lower frame portion 141 or with its head 160 on the upper frame section 140 comes to rest.
  • openings 19 and 20 are provided in the housing at the level of these spaces.
  • a tab 24 is fixed to the box 15, which extends normal to the lower portion 151 of the box 15 and extends away from it, that is, in the lying below the box 15 space.
  • This flap 24 thus extends parallel to the plane of the opening 19 and is disposed immediately adjacent thereto. Due to its connection with the box 15, the flap 24 is displaced together with the box 15 and thus covers the lying below the box 15 portion of the opening 19. A through this opening 19 inserted therethrough wire can only in between the lower frame portion 151th and lower box portion 141 lying space 17 are used, an above-described erroneous insertion of a wire under the box 15 is reliably avoided.
  • the tab 24 may be constructed arbitrarily: it could for example be made in one piece with the box 15, for example by being bent from the same conductive sheet metal strip as this box 15. But it can also be a separate from the box 15 and with the box 15 firmly connected-for example, welded or glued-component.
  • a plate 25 running parallel to the lower box section 151 is formed on the tabs 24, via which tab the flap 24 is connected to the box 15.
  • the plate 25 may be glued or welded to the lower box section 151, for example.
  • the connection between the plate 25 and the lower box section 151 is achieved by a mounting plate 26, which is formed on the plate 25 and extends normally both to this plate 25 and to the flap 24.
  • This mounting plate 26 is fixedly connected to a side wall of the box 15, which could be realized again by gluing or welding of these two parts.
  • a preferred used and therefore also shown in Figures 1 to 4 variant for fixing the mounting plate 26 on the box 15 provides a pin 27, which is integrally formed on the mounting plate 26.
  • an opening 28 is incorporated, in which this pin 27 engages, whereby a positive fastening of the mounting plate 26 and thus of the tab 24 is achieved on the box 15.
  • the lift clamp 1 in question has two points, namely the spaces 17 and 18, for clamping electrical lines, normally in the lower space 17 wires and in the upper space 18, the terminal lug of a busbar system is used.
  • the clamping screw 16 is not only rotated, but also pressed down with the screwdriver used for this purpose. This leads in lift clamps, which have only the previously discussed design features, that the screw head 16 is always pressed against the upper frame portion 141 and the rotation of the clamping screw 16 only in a downward displacement of the box 15, ie in an opening of the room 17 is implemented.
  • the resulting static friction between the box 15 and the frame 14 or the housing parts initially prevents the above-discussed displacement of the box 15 relative to the frame 14, bringing the clamping screw 16 when rotating in the opening direction Box 15 and frame 14 out or when turning in the closing direction in box 15 and frame 14 moves into it.
  • the (friction) resistance is dimensioned so that it can be overcome, for example by exerting a pressure on the screw head 160. This allows that upon rotation of the clamping screw 16 - if desired - immediately the lower space 17 can be opened.
  • a rib 30, into which a bore 31 is embedded, is located above the screw head 160.
  • the screw head 160 comes to rest on the rib 30. If the clamping screw 16 now continues to be rotated in the opening direction, the box 15 is pressed downwards, since the clamping screw 16 can no longer move upwards. The resistance is overcome and moved the box 15 down. The resistance can be realized, as shown in FIG. 5, by means of a spring 32, which pretensions the box 15 in the direction of the frame 14.
  • a shear pin 33 is provided which is secured in the housing.
  • the shear pin 33 is positively connected to the box 15 when it is in the position shown in Figure 1 and Figure 6. This can be achieved, for example, by engaging the shear pin 33 in an aperture machined into the box sidewall, or by placing the shear pin 33 just below the lower box portion 151, as shown in FIG.
  • a shear pin 33 is provided, which, however, is only indirectly connected to the box 15:
  • a tab 24 is provided, on which a small plate 25 is formed, with which the mounting plate 26 is integrally formed.
  • This mounting plate 26 is slidably mounted in a, recessed into the housing rectangular guide groove 34 in the direction of displacement of the box 15 parallel direction.
  • an integrally formed on the mounting plate 26 pin 27 is provided, which engages in an incorporated in the box side wall opening 28.
  • the shear pin 33 is integrally formed on the bottom of this guide groove 34.
  • the mounting plate 26 has an opening 35, in which the shear pin 33rd engages (see Fig.2,3).
  • the shear pin 33 is indirectly, namely connected by the intermediary of the mounting plate 26 and the pin 27 with the box 15.
  • the shearing strength of this pin 27 is correspondingly greater than that of the shear pin 33.
  • the shear pin 33 has in this embodiment the secondary function that he holds the mounting plate 26 and with this the flap 24 during assembly of the switch, ie when inserting the individual components in the housing lower shell, at the correct position.
  • the mounting plate 26 with molded plates 25 and tabs 24 can thus be used by machine in the lower shell, frame 14 and box 15 of the lift clamps 1 can then be placed without difficulty on the mounting plate 26.

Landscapes

  • Patch Boards (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Finger-Pressure Massage (AREA)
  • Road Signs Or Road Markings (AREA)
  • Prostheses (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Liquid Crystal Substances (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Vehicle Body Suspensions (AREA)
  • Magnetic Heads (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Clamps And Clips (AREA)
  • Trip Switchboards (AREA)

Abstract

The lifting clamp (1) has a rectangular frame (14) and a rectangular box (15) with an upper section (150) positioned between the upper and lower sections (140,141) of the frame and displaced relative to the latter against a resistance provided by the friction between the box and the frame. A clamp screw (16) fits through an opening (142) in the upper section of the frame for engaging a screw thread (152) in the upper section of the box.

Description

Die Erfindung betrifft eine Liftklemme zum Einbau in ein Gehäuse eines elektrischen Gerätes, wie z.B. eines Leitungsschutzschalters, umfassend einen rechteckigen Rahmen und einen rechteckigen Kasten, dessen oberer Abschnitt zwischen dem oberen Abschnitt und dem unteren Abschnitt des Rahmens angeordnet ist, womit der Kasten verschiebbar im Rahmen gehalten ist, umfassend weiters eine Klemmschraube, die durch eine in den oberen Rahmen-Abschnitt eingearbeitete Durchbrechung frei drehbar hindurch geführt und in ein in den oberen Abschnitt des Kastens eingearbeitetes Gewinde, weiters einen am Kasten festgelegten Lappen, der sich vom unteren Abschnitt des Kastens weg in den unterhalb des Kastens liegenden Raum erstreckt und parallel zur Ebene einer benachbart zur Liftklemme liegenden Öffnung im Gehäuse verläuft.
Derartige Liftklemmen mit am Kasten festgelegten Lappen bzw. Verschlußblenden sind beispielsweise aus der EP 0 559 585 A und der US 5 580 285 A bekannt. Nachteilig an der EP 0 559 585 A erweist sich, dass die dort gezeigte Lasche einstückig mit dem metallischen Kasten ausgebildet ist und somit nicht einen elektrisch isolierenden Schutz bietet. Die US 5 580 285 A hingegen zeigt in einer besonderen Ausführungsform eine abnehmbare Verschlußblende. Diese Verschlußblende wird jedoch lediglich mit kleinen Haken am Kasten befestigt, sodass die resultierende geringe Verbundfläche keine sichere Verbindung gewährleistet.
Die Aufgabe der Erfindung besteht daher darin, einen Lappen zur Abdeckung des unteren Aufnahmeraumes sicher mit dem Kasten zu verbinden.
Erfindungsgemäß wird dies dadurch gelöst, daß an den Lappen ein parallel zum unteren Kasten-Abschnitt verlaufendes Plättchen angeformt ist, vermittels welchem der Lappen mit dem Kasten verbunden ist. Der unterhalb des unteren Kasten-Abschnittes liegende Abschnitt der Öffnung wird damit abgedeckt, womit ein irrtümliches Einsetzen von Leitern unter den unteren Kasten-Abschnitt vermieden ist. Das Plättchen ermöglicht einen relativ großflächigen Kontakt mit dem Kasten und gewährleistet so eine sichere Verbindung.
In diesem Zusammenhang kann weiters vorgesehen sein, daß an das Plättchen ein sowohl normal zu diesem als auch normal zum Lappen verlaufendes Montageplättchen angeformt ist, das fest mit einer Seitenwand des Kastens verbunden ist.
In weiterer Ausgestaltung der Erfindung kann in diesem Zusammenhang vorgesehen sein, daß an das Montageplättchen ein Stift angeformt ist, der in eine in die Kasten-Seitenwand eingearbeitete Durchbrechung eingreift.
Damit kann der Kasten auf besonders einfache, mit geringem technischen Aufwand verbundene Art, nämlich durch bloßes Aufsetzen des Kastens auf das Montageplättchen, auf diesem festlegt werden.
In diesem Zusammenhang kann weiters vorgesehen sein, daß in das Montageplättchen eine Durchbrechung eingearbeitet ist, in welche ein im Gehäuse festgelegter Abscherbolzen eingreift.
Durch diese Anordnung des Abscherbolzens kann dieser neben seiner Hauptfunktion des Bereitstellens eines Widerstandes gegen eine Verschiebung des Kastens die Hilfsfunktion des Haltens von Montageplättchen, Plättchen und Lappen im Gehäuse erfüllen. Beim Einbau der Komponenten des Schalters in das Gehäuse können dadurch Montageplättchen, Plättchen und Lappen maschinell in die Unterschale eingesetzt werden.
The invention relates to a lift clamp for installation in a housing of an electrical device, such as a circuit breaker, comprising a rectangular frame and a rectangular box, the upper portion between the upper portion and the lower portion of the frame is arranged, whereby the box slidably in the frame further comprising a clamping screw freely rotatably guided through an aperture formed in the upper frame portion and threaded into an upper portion of the box, and a tab fixed to the box extending from the lower portion of the box extends into the space lying below the box and parallel to the plane of an adjacent to the lift clamp opening in the housing.
Such lift clamps with fixed to the box lobes or shutters are for example from the EP 0 559 585 A and the US 5 580 285 A known. A disadvantage of the EP 0 559 585 A proves that the tab shown there is integrally formed with the metallic box and thus does not provide an electrically insulating protection. The US 5 580 285 A whereas, in a particular embodiment, shows a removable shutter. However, this shutter is attached only with small hooks on the box, so that the resulting low composite surface ensures no secure connection.
The object of the invention is therefore to securely connect a cloth to cover the lower receiving space with the box.
According to the invention this is achieved in that a parallel to the lower box section extending plate is formed on the lobes, by means of which the flap is connected to the box. The section of the opening below the lower box section is covered thereby, thus avoiding erroneous insertion of ladders under the lower box section. The plate allows a relatively large-area contact with the box, thus ensuring a secure connection.
In this context, it may further be provided that on the platelet a mounting plate running both normal to this and normal to the flap is integrally formed, which is firmly connected to a side wall of the box.
In a further embodiment of the invention may be provided in this context that a pin is formed on the mounting plate, which engages in an incorporated into the box side wall opening.
Thus, the box on particularly simple, with little technical effort associated type, namely by merely placing the box on the mounting plate, this will be fixed.
In this context, it can further be provided that in the mounting plate an opening is incorporated, in which engages a specified in the housing shear pin.
By this disposition of the shear bolt, in addition to its main function of providing resistance to displacement of the box, it can fulfill the auxiliary function of holding mounting plates, plates and lobes in the housing. When the components of the switch are installed in the housing, mounting plates, plates and lobes can be mechanically inserted into the lower shell.

Die Erfindung wird unter Bezugnahme auf die beigeschlossenen Zeichnungen, in welchen besonders bevorzugte Ausführungsbeispiele dargestellt sind, näher beschrieben. Dabei zeigt:

  • Fig.1 die Draufsicht auf einen mit Liftklemmen 1 ausgestatteten Leitungsschutzschalter bei abgenommener Oberschale;
  • Fig.2 die lediglich mit einer Liftklemme 1 bestückte Unterschale des Leitungsschutzschalters gemäß Fig.1 im Schrägriß, wobei die zweite Liftklemme 1 außerhalb der Unterschale liegend dargestellt ist;
  • Fig.3 eine Draufsicht auf eine lediglich mit der rechten Liftklemme 1 bestückte Unterschale des Leitungsschutzschalters gemäß Fig.1, wobei im Bereich der linken Liftklemme ein am Kasten 15 der Liftklemme 1 festlegbarer Lappen 24 vorgesehen ist;
  • Fig.4 das in Fig.3 Gezeigte im Schrägriß;
  • Fig.5 eine Draufsicht auf eine in einem Gehäuse eingebaute Liftklemme 1, wobei der Widerstand, gegen welchen der Kasten 15 der Klemme 1 verschiebbar ist, durch eine Schrauben-Druckfeder 32 gebildet ist und
  • Fig.6 das in Fig.5 Gezeigte, wobei zur Realisierung des Widerstandes anstelle der Schrauben-Druckfeder 32 ein an die Gehäuse-Innenwandung angeformter Abscherbolzen 33 vorgesehen ist.
The invention will be described in more detail with reference to the accompanying drawings, in which particularly preferred embodiments are shown. Showing:
  • 1 shows the top view of a equipped with lift terminals 1 circuit breaker with removed top shell;
  • FIG. 2 shows the lower shell of the circuit breaker according to FIG. 1 fitted with a lift clamp 1 in oblique view, the second lift clamp 1 being shown lying outside the lower shell; FIG.
  • 3 shows a plan view of a lower shell of the circuit breaker according to FIG. 1, which is equipped only with the right lift clamp 1, wherein a tab 24 which can be fixed to the box 15 of the lift clamp 1 is provided in the region of the left lift clamp;
  • 4 shows in Fig.3 Shown in the oblique view;
  • 5 shows a plan view of a built-in housing lift clamp 1, wherein the resistance against which the box 15 of the terminal 1 is displaceable, is formed by a helical compression spring 32 and
  • Fig.6 the shown in Figure 5, wherein for realizing the resistance instead of the helical compression spring 32 an integrally formed on the housing inner wall shear pin 33 is provided.

Der in Fig.1 dargestellte Leitungsschutzschalter umfaßt zwei, als sog. "Liftklemmen" ausgeführte Schraubklemmen 1, mittels welcher Leitungsdrähte sowie die kammartigen Anschlußfahnen von Verschienungssystemen an den Schutzschalter angeschlossen werden können.
Der Schutzschalter umfaßt weiters ein Überlastauslöseelement 2 sowie eine Kurzschlußauslöseeinrichtung 3, daneben ein Schaltwerk 4, das den beweglichen Kontakt 5 von einer geschlossenen Position, in welcher der bewegliche Kontakt 5 am feststehenden Kontakt 8 anliegt, in die in Fig.1 dargestellte geöffnete Stellung bewegen kann.
Der zu überwachende Strom durchfließt in diesem Schutzschalter ausgehend von der rechten Schraubklemme 1 zunächst das Überlastauslöseelement 2, gelangt über ein bewegliches Lciterseil 6 und die Schaltbrücke 7 zum beweglichen Kontakt 5, danach über den feststehenden Kontakt 8 zur Kurzschlußauslöseeinrichtung 3 und abschließend zur zweiten Anschlußklemme 1.
Das Schaltwerk 4 ist sowohl von der Kurzschlußauslöseeinrichtung 3 als auch vom Überlastauslöseelement 2 betätigbar. Die Kurzschlußauslöseeinrichtung 3 ist in an sich bekannter Weise durch eine Magnetspule mit beweglichem Anker gebildet, welcher Anker bei entsprechend hohen Kurzschlußströmen auf die Schaltbrücke 7 des Schaltwerkes 4 schlägt.
Das Überlastauslöseelement 1 besteht aus einem Bimetallstreifen, der vom zu überwachenden Strom erwärmt wird. Das erste Ende 21 des Bimetallstreifens ist im Gehäuse des Schutzschalters festgelegt, das zweite Ende 22 ist frei beweglich gehalten. Die durch die Erwärmung des Bimetalls hervorgerufene Verbiegung desselben führt daher zu einer Bewegung des zweiten Endes 22 in Richtung des Pfeiles 23. Bei ausreichend starker Erwärmung kommt das freie Ende 22 des Bimetallstreifens bei dieser Bewegung in Berührung mit dem auf die Klinkenauflage 36 einwirkenden Bügel 9, nimmt diesen in Bewegungsrichtung mit und löst dadurch ein Ansprechen des Schaltwerkes 4 aus.
Die Schaltbrücke 7 ist mittels einer Feder 10 in Richtung geöffneter Stellung des beweglichen Kontaktes 5 vorgespannt. Die erläuterten geringfügigen Auslenkungen der Klinkenauflage 36 durch den Anker der Kurzschlußauslöseeinrichtung 3 bzw. durch das Überlastauslöseelement 2 über den Bügel 9 werden mittels dieser Feder 10 zur vollständigen Verschwenkung der Schaltbrücke 7 in die geöffnete Stellung des beweglichen Kontaktes 5 verstärkt.
Zum Einschalten des Schutzschalters, d.h. zum Zuruckverschwenlcen des Kontaktträgers 7 in die geschlossene Stellung des beweglichen Kontaktes 5 ist ein von außen zugänglicher, händisch bedienbarer Hebel 11 vorgesehen.
Das Gehäuse des Schutzschalters ist in an sich bekannter Weise zweiteilig, bestehend aus der in den Zeichnungsfiguren jeweils ersichtlichen Unterschale 12 und einer in den Zeichnungen nicht dargestellten, hinsichtlich seiner konstruktiven Ausführung zur Unterschale 12 spiegelbildlichen Oberschale, ausgeführt.
The circuit breaker shown in Figure 1 comprises two, as so-called. "Lift terminals" running screw 1, by means of which lead wires and the comb-like terminal lugs of busbar systems can be connected to the circuit breaker.
The circuit breaker further comprises an overload trip element 2 and a short-circuit tripping device 3, next to a switching mechanism 4, which can move the movable contact 5 from a closed position in which the movable contact 5 is applied to the fixed contact 8 in the open position shown in Figure 1 ,
The current to be monitored flows through in this circuit breaker, starting from the right screw 1, first the overload trip element 2, passes through a movable Lciterseil 6 and the switching bridge 7 to the movable contact 5, then via the fixed contact 8 to the short tripping device 3 and finally to the second terminal. 1
The switching mechanism 4 can be actuated both by the short-circuit tripping device 3 and by the overload tripping element 2. The short-circuit tripping device 3 is formed in a conventional manner by a magnetic coil with a movable armature, which beats anchor at correspondingly high short-circuit currents on the switching bridge 7 of the switching mechanism 4.
The overload release element 1 consists of a bimetallic strip which is heated by the current to be monitored. The first end 21 of the bimetallic strip is fixed in the housing of the circuit breaker, the second end 22 is held freely movable. The bending thereof caused by the heating of the bimetal therefore leads to a movement of the second end 22 in the direction of the arrow 23. With sufficient heating, the free end 22 of the bimetallic strip in this movement comes into contact with the bracket 9 acting on the pawl support 36. takes this in the direction of motion and thereby triggers a response of the rear derailleur 4.
The switching bridge 7 is biased by a spring 10 in the direction of the open position of the movable contact 5. The explained minor deflections of the pawl support 36 by the armature of the short-circuit release device 3 and by the overload release element 2 via the bracket 9 are amplified by means of this spring 10 for complete pivoting of the switching bridge 7 in the open position of the movable contact 5.
To turn on the circuit breaker, ie for Rückuckverschwenlcen the contact carrier 7 in the closed position of the movable contact 5 is provided accessible from the outside, manually operable lever 11.
The housing of the circuit breaker is in a conventional manner in two parts, consisting of the respectively apparent in the drawing figures lower shell 12 and not shown in the drawings, with respect to its structural design to the lower shell 12 mirror image of the upper shell executed.

Die vorliegende Erfindung bezieht sich auf die Liftklemmen 1 und ist nicht auf den Einsatz dieser Liftklemmen 1 in Leitungsschutzschaltern eingeschränkt. In den Zeichnungen wurde nur deshalb ein Leitungschutzschalter bzw. die Unterschale 12 eines solchen dargestellt, weil hierin ein besonders bevorzugtes Anwendungsgebiet der Liftklemme 1 liegt. Sie kann dessenungeachtet aber bei elektrischen Geräten beliebiger Typen, also beispielsweise bei FI-Schutzschalter, Ableitertrennschalter, Treppenhausautomaten usw., verwendet werden.The present invention relates to the lift clamps 1 and is not limited to the use of these lift clamps 1 in circuit breakers. In the drawings, only a line protection switch or the lower shell 12 of such was shown, because herein is a particularly preferred application of the lift clamp 1. However, it can nevertheless be used in electrical appliances of any type, that is to say, for example, in the case of a residual current circuit breaker, arrester isolating switch, staircase automaton, etc.

Die Liftklemme 1 weist so wie bisher bekannte Schraubklemmen dieses Typs einen Rahmen 14 auf, der in der in Fig. 1 dargestellten Lage betrachtet rechteckig ist. Er besteht in aller Regel aus einem einstückigen, dreimal um 90° abgewinkelten Kupferstreifen. Dieser Rahmen 14 ist unbeweglich im Gehäuse gehalten, was beispielsweise durch Einklemmen zwischen Anformungen an die Unterschalen-Innenwandung erreichbar ist.
Zweiter Hauptbauteil einer Liftklemme 1 ist der Kasten 15, der ebenfalls rahmenartig ausgebildet ist (vgl. auch Fig.2). Der Kasten 15 ist um 90° gegenüber dem Rahmen 14 verdreht und in diesen eingehängt, d.h. der obere Abschnitt 150 des Kastens 15 liegt zwischen dem oberen Abschnitt 140 und dem unteren Abschnitt 141 des Rahmens 14. Der Kasten 15 ist damit verschiebbar im Rahmen 14 geführt.
Der dritte Hauptbauteil der Liftklemme ist die Klemmschraube 16. Der obere Abschnitt 140 des Rahmens 14 weist eine Durchbrechung 142 auf, durch welche die Klemmschraube 16 frei drehbar hindurchgeführt ist. Im oberen Abschnitt 150 des Kastens 15 ist ein Gewinde 152 eingearbeitet, in welches die Klemmschraube 16 eingreift. Wird die Klemmschraube 16 in Schließrichtung (also im Uhrzeigersinn bei Ausführung der Klemmschraube 16 als Rechtsschraube) gedreht, wird der Kasten 15 gehoben, d.h. in Richtung oberen Rahmen-Abschnitt 140 bewegt. Diese Verschiebung kommt deshalb zustande, weil die Klemmschraube 16 mit ihrem fußseitigen Ende am unteren Rahmen-Abschnitt 141 oder mit ihrem Kopf 160 am oberen Rahmen-Abschnitt 140 zur Anlage kommt. Weiter fortschreitendes Hineindrehen der Klemmschraube 16 in das Kastengewinde 152 kann damit nicht zu Verschiebungen der Klemmschraube 16 nach unten, sondern nur zu einem Anheben des Kastens 15 führen.
Wird die Klemmschraube 16 in Öffnungsrichtung (also gegen den Uhrzeigersinn bei Ausführung der Klemmschraube 16 als Rechtsschraube) gedreht, wird der Kasten 15 gesenkt, d.h. in Richtung unterer Rahmen-Abschnitt 141 bewegt.
The lift clamp 1 has, as previously known screw terminals of this type, a frame 14 which, viewed in the position shown in FIG. 1, is rectangular. It usually consists of a one-piece, three times 90 ° angled copper strip. This frame 14 is immovably held in the housing, which can be achieved for example by clamping between projections on the lower shell inner wall.
Second main component of a lift clamp 1 is the box 15, which is also frame-like (see also Fig.2). The box 15 is rotated by 90 ° relative to the frame 14 and hung in this, ie, the upper portion 150 of the box 15 is located between the upper portion 140 and the lower portion 141 of the frame 14. The box 15 is thus slidably guided in the frame 14 ,
The third main component of the lift clamp is the clamping screw 16. The upper portion 140 of the frame 14 has an opening 142 through which the clamping screw 16 is freely rotatably guided. In the upper portion 150 of the box 15, a thread 152 is incorporated, in which the clamping screw 16 engages. If the clamping screw 16 is rotated in the closing direction (ie clockwise when the clamping screw 16 is designed as a right-hand screw), the box 15 is lifted, ie moved in the direction of the upper frame section 140. This shift is due to the fact that the clamping screw 16 with its foot-side end on the lower frame portion 141 or with its head 160 on the upper frame section 140 comes to rest. Continued inward turning of the clamping screw 16 into the box thread 152 can thus not lead to displacements of the clamping screw 16 downwards, but only to a lifting of the box 15.
If the clamping screw 16 is rotated in the opening direction (ie counterclockwise when the clamping screw 16 is designed as a right-hand screw), the box 15 is lowered, ie moved in the direction of the lower frame section 141.

Eine derartige Liftklemme 1 weist zwei Stellen auf, an welchen elektrische Leitungen eingeklemmt werden können. Zum einen können Zuleitungen in den zwischen dem unteren Rahmen-Abschnitt 141 und dem unteren Kasten-Abschnitt 151 liegenden Raum 17 und zum anderen in den zwischen dem oberen Rahmenabschnitt 140 und dem Schraubenkopf 160 liegenden Raum 18 eingebracht werden (vgl. Fig.2). Beim Anziehen der Klemmschraube 16 werden sowohl die unteren Abschnitte 141 und 151 des Rahmens 14 und des Kastens 15 gegeneinander als auch der Schraubenkopf 16 gegen den oberen Rahmen-Abschnitt 140 gedrückt und dabei die in die Räume 17 und 18 eingebrachten Leitungen eingeklemmt.
In aller Regel werden in den zwischen unterem Rahmen-Abschnitt 141 und unterem Kasten-Abschnitt 151 liegenden Raum 17 Leitungsdrähte eingesetzt und in den zwischen oberem Rahmen-Abschnitt 140 und Schraubenkopf 16 liegenden Raum 18 eine Anschlußfahne eines Verschienungssystems eingesetzt. Um diese beiden Räume 17, 18 für ein Einsetzen dieser elektrischen Leitungen zugänglich zu halten, sind im Gehäuse auf Höhe dieser Räume 17,18 Öffnungen 19 und 20 vorgesehen.
Im Zusammenhang mit dem Einsetzen eines Leitungsdrahtes in den unteren Raum 17 besteht -insbesondere wenn die Klemme nicht weit genug geöffnet ist, d.h. der untere Abschnitt 150 des Kastens 15 zu nahe dem unteren Abschnitt 141 des Rahmens 14 liegt- die Problematik, daß dieser Draht zwar durch die Öffnung 19 hindurch geführt, aber dann irrtümlicherweise nicht in den Raum 17, sondern unter den Kasten 15 gelegt wird. Ein ordnungsgemäßes Einklemmen dieses Drahtes ist dann nicht mehr möglich.
Um ein derartiges Fehl-Einsetzen des Leitungsdrahtes zu verhindern, ist am Kasten 15 ein Lappen 24 festgelegt, der normal zum unteren Abschnitt 151 des Kastens 15 verläuft und sich von diesem weg, d.h. in den unterhalb des Kastens 15 liegenden Raum erstreckt. Dieser Lappen 24 verläuft damit parallel zur Ebene der Öffnung 19 und ist unmittelbar neben dieser angeordnet.
Aufgrund seiner Verbindung mit dem Kasten 15 wird der Lappen 24 gemeinsam mit dem Kasten 15 verschoben und verdeckt damit den unterhalb des Kastens 15 liegenden Abschnitt der Öffnung 19. Ein durch diese Öffnung 19 hindurch gesteckter Draht kann damit nur in den zwischen unterem Rahmen-Abschnitt 151 und unterem Kasten-Abschnitt 141 liegenden Raum 17 eingesetzt werden, ein oben beschriebenes irrtümliches Einsetzen eines Drahtes unter den Kasten 15 wird zuverlässig vermieden.
Der Lappen 24 kann konstruktiv beliebig ausgeführt sein: Er könnte beispielsweise einstückig mit dem Kasten 15 ausgeführt sein, beispielsweise indem er aus demselben leitenden Blechstreifen wie dieser Kasten 15 gebogen ist. Er kann aber auch ein vom Kasten 15 separater und mit dem Kasten 15 fest verbundener -beispielsweise verschweißter oder verklebter- Bauteil sein. Er kann dabei aus einem isolierenden Material, wie z.B. Kunststoff gebildet sein, was den zusätzlichen Vorteil bringt, daß der Lappen 24 selbst dann gefahrlos berührt werden kann, wenn seine Klemme mit Spannung beaufschlagt ist, was beispielsweise dann der Fall sein kann, wenn an der anderen Klemme bereits ein spannungsführender Leiter angeschlossen ist.
Bei der in den Fig.1-4 dargestellten Ausführungsform ist an den Lappen 24 ein parallel zum unteren Kasten-Abschnitt 151 verlaufendes Plättchen 25 angeformt, über welches der Lappen 24 mit dem Kasten 15 verbunden ist. Das Plättchen 25 kann dazu beispielsweise mit dem unteren Kasten-Abschnitt 151 verklebt oder verschweißt sein.
Gemäß der Ausführungsform der Fig.1-4 wird die Verbindung zwischen dem Plättchen 25 und dem unteren Kasten-Abschnitt 151 durch ein Montageplättchen 26 erreicht, das an das Plättchen 25 angeformt ist und sowohl zu diesem Plättchen 25 als auch zum Lappen 24 normal verläuft. Dieses Montageplättchen 26 ist fest mit einer Seitenwand des Kastens 15 verbunden, was wieder durch Verklebung oder Verschweißung dieser beiden Teile realisiert sein könnte.
Eine bevorzugt eingesetzte und deshalb auch in den Fig.1-4 dargestellte Variante zur Festlegung des Montageplättchens 26 am Kasten 15 sieht einen Stift 27 vor, der an das Montageplättchen 26 angeformt ist. In die Kasten-Seitenwand ist eine Durchbrechung 28 eingearbeitet, in welche dieser Stift 27 eingreift, womit eine formschlüssige Befestigung des Montageplättchens 26 und damit des Lappens 24 am Kasten 15 erreicht wird.
Such a lift clamp 1 has two points at which electrical lines can be clamped. On the one hand, feed lines can be introduced into the space 17 lying between the lower frame section 141 and the lower box section 151 and, on the other hand, into the space 18 lying between the upper frame section 140 and the screw head 160 (see FIG. When tightening the clamping screw 16, both the lower portions 141 and 151 of the frame 14 and the box 15 against each other and the screw head 16 pressed against the upper frame portion 140 while the introduced into the spaces 17 and 18 lines clamped.
As a rule, 17 lead wires are inserted into the space lying between the lower frame section 141 and lower box section 151 and inserted into the space 18 located between the upper frame section 140 and screw head 16 a terminal lug of a busbar system. In order to keep these two rooms 17, 18 accessible for insertion of these electrical lines, openings 19 and 20 are provided in the housing at the level of these spaces.
In connection with the insertion of a lead wire in the lower space 17 is - in particular when the clamp is not opened wide enough, ie the lower portion 150 of the box 15 is too close to the lower portion 141 of the frame 14 - the problem that this wire while passed through the opening 19, but then erroneously not in the space 17, but is placed under the box 15. A proper pinching this wire is then no longer possible.
In order to prevent such mis-insertion of the lead wire, a tab 24 is fixed to the box 15, which extends normal to the lower portion 151 of the box 15 and extends away from it, that is, in the lying below the box 15 space. This flap 24 thus extends parallel to the plane of the opening 19 and is disposed immediately adjacent thereto.
Due to its connection with the box 15, the flap 24 is displaced together with the box 15 and thus covers the lying below the box 15 portion of the opening 19. A through this opening 19 inserted therethrough wire can only in between the lower frame portion 151th and lower box portion 141 lying space 17 are used, an above-described erroneous insertion of a wire under the box 15 is reliably avoided.
The tab 24 may be constructed arbitrarily: it could for example be made in one piece with the box 15, for example by being bent from the same conductive sheet metal strip as this box 15. But it can also be a separate from the box 15 and with the box 15 firmly connected-for example, welded or glued-component. It can be made of an insulating material, such as plastic, which has the additional advantage that the flap 24 can be safely touched even when its terminal is energized, which may for example be the case when at the another terminal is already connected to a live conductor.
In the embodiment illustrated in FIGS. 1-4, a plate 25 running parallel to the lower box section 151 is formed on the tabs 24, via which tab the flap 24 is connected to the box 15. The plate 25 may be glued or welded to the lower box section 151, for example.
According to the embodiment of FIGS. 1-4, the connection between the plate 25 and the lower box section 151 is achieved by a mounting plate 26, which is formed on the plate 25 and extends normally both to this plate 25 and to the flap 24. This mounting plate 26 is fixedly connected to a side wall of the box 15, which could be realized again by gluing or welding of these two parts.
A preferred used and therefore also shown in Figures 1 to 4 variant for fixing the mounting plate 26 on the box 15 provides a pin 27, which is integrally formed on the mounting plate 26. In the box side wall, an opening 28 is incorporated, in which this pin 27 engages, whereby a positive fastening of the mounting plate 26 and thus of the tab 24 is achieved on the box 15.

Wie bereits erläutert, weist die in Rede stehende Liftklemme 1 zwei Stellen, nämlich die Räume 17 und 18, zum Einklemmen von elektrischen Leitungen auf, wobei normalerweise in den unteren Raum 17 Leitungsdrähte und in den oberen Raum 18 die Anschlußfahne eines Verschienungssystems eingesetzt wird.
In aller Regel ist es dabei so, daß an ein und dieselbe Anschlußklemme nur ein Leitungs-Typ, also entweder eine Verschienungssystem-Anschlußfahne oder ein Leitungsdraht angeschlossen wird.
Beim Öffnen der Klemme wird mit dem dazu verwendeten Schraubendreher die Klemmschraube 16 nicht nur gedreht, sondern auch nach unten gedrückt. Dies führt bei Liftklemmen, welche nur die bislang erörterten Konstruktionsmerkmale aufweisen, dazu, daß der Schraubenkopf 16 stets gegen den oberen Rahmen-Abschnitt 141 gedrückt und das Drehen der Klemmschraube 16 lediglich in ein Nach-unten-Verschieben des Kastens 15, d.h. in ein Öffnen des Raumes 17 umgesetzt wird. Erst wenn der Kasten 15 ganz nach unten verfahren ist und in dieser Stellung an dem unter ihm liegenden Gehäuseteil 29 zur Anlage kommt, kann kein weiteres Nach-unten-Schieben des Kastens 15 mehr erfolgen. Eine dann noch immer ausgeübte Öffnungsbewegung der Klemmschraube 16 wird in ein Nach-oben-Verschieben der Klemmschraube 16 umgesetzt, womit der Schraubenkopf 160 vom oberen Rahmenteil 140 abgehoben und der obere Raum 18 geöffnet wird.
Beim Drehen der Klemmschraube 16 in Schließrichtung wird zuerst der Raum 18 geschlossen, danach der Kasten 15 angehoben, bis sein unterer Abschnitt 151 am unteren Abschnitt 141 des Rahmens 14 zur Anlage kommt und erst bei danach noch weiter fortgesetztem Drehen der Klemmschraube 16 in Schließrichtung wird der Schraubenkopf 160 klemmend gegen den oberen Rahmenabschnitt 140 gedrückt.
Durch diese Funktionsweise ist bedingt, daß dann wenn an eine Liftklemme 1 lediglich eine Verschienungssystem-Anschlußfahne angeschlossen werden soll, zunächst die Klemmschraube 16 zur Gänze geöffnet und nach Einsetzen der Anschlußfahne in den Raum 18 wieder zur Gänze geschlossen werden muß.
Es ist zur Behebung dieses, einen zeitaufwendigen Montagevorgang bedingenden Umstandes vorgesehen, daß der Kasten 15 der Liftklemme 1 im Rahmen 14 nicht frei, sondern gegen einen Widerstand verschiebbar gehalten ist. Dieser Widerstand ist auf verschiedene Arten realisierbar:
So kann beispielsweise der Kasten 15 am Rahmen 14 oder an Teilen des Gehäuses reibend anliegen. Die damit gegebene Haftreibung zwischen dem Kasten 15 und dem Rahmen 14 oder den Gehäuseteilen verhindert zunächst die oben erörterte Verschiebung des Kastens 15 gegen über dem Rahmen 14, womit die Klemmschraube 16 bei Drehen in Öffnungsrichtung aus Kasten 15 und Rahmen 14 heraus- bzw. bei Drehen in Schließrichtung in Kasten 15 und Rahmen 14 hinein wandert. Der (Reibungs-)Widerstand wird so dimensioniert, daß er überwunden werden kann, beispielsweise durch Ausüben eines Druckes auf den Schraubenkopf 160. Dies erlaubt es, daß bei Drehung der Klemmschraube 16 -sofern erwünscht- sofort der untere Raum 17 geöffnet werden kann.
Beim in Fig.1 gezeigten Ausführungsbeispiel des Gehäuses befindet sich oberhalb des Schraubenkopfes 160 eine Rippe 30, in welche eine Bohrung 31 eingelassen ist. Diese Bohrung 31, die zur Hindurchführung des zum Drehen der Klemmschraube 16 notwendigen Schraubenziehers dient, weist geringeren Durchmesser auf als der Kopf 160 der Klemmschraube 16.
Beim Nach-oben-Wandern der Klemmschraube 16, welches bei Drehung in Öffnungsrichtung dann erfolgt, wenn nicht gleichzeitig ein Druck auf die Klemmschraube 16 ausgeübt wird, kommt der Schraubenkopf 160 an der Rippe 30 zu Anlage. Wird die Klemmschraube 16 jetzt weiterhin in Öffnungsrichtung gedreht, wird -da die Klemmschraube 16 ja nicht mehr nach oben wandern kann- der Kasten 15 nach unten gedrückt. Der Widerstand wird dabei überwunden und der Kasten 15 nach unten verschoben.
Der Widerstand kann -so wie in Fig.5 dargestellt- mittels einer Feder 32 realisiert sein, welche den Kasten 15 in Richtung Rahmen 14 vorspannt. Diese Feder 32 kann dazu durch eine Blattfeder oder -so wie in Fig.5 explizit dargestellt- durch eine Schrauben-Druckfeder gebildet sein, die unterhalb des Kastens 15 liegt und sich einerends am Gehäuseteil 29 und andererends -unter Vermittlung des Plättchens 25, sofern ein solches vorgesehen ist- am unteren Abschnitt 151 des Kastens 15 abstützt.
Es können gleichzeitig mehrere Varianten der Realisierung des Widerstandes vorhanden sein, beispielsweise kann der Kasten 15 sowohl am Rahmen 14 als auch am Gehäuse reibend gelagert sein oder es kann zusätzlich zur reibenden Lagerung des Kastens 15 am Rahmen 14 eine Feder 32 vorhanden sein.
Wie aus diesen Erörterungen der Funktion des Widerstandes hervorgeht, können ein solcher bzw. zu seiner Realisierung notwendige Bauteile unabhängig von einem Lappen 24, d.h. auch dann, wenn ein solcher Lappen 24 fehlt, vorgesehen sein. Gibt es einen Lappen 24, kann der Widerstand durch reibende Lagerung dieses Lappens 24 im Gehäuse 12 realisiert sein.
Den bislang erörterten Möglichkeiten der Realisierung des Widerstandes ist gemeinsam, daß sie diesen Widerstand ständig ausüben, d.h. daß dieser Widerstand durch Verschiebungen des Kastens 15 nicht wesentlich verändert wird.
Bei einer bevorzugten Ausführungsform der Erfindung ist ein Abscherbolzen 33 vorgesehen, der im Gehäuse befestigt ist. Der Abscherbolzen 33 ist mit dem Kasten 15 formschlüssig verbunden, wenn sich dieser in der in Fig.1 und Fig.6 dargestellten Position befindet. Dies kann beispielsweise dadurch erreicht werden, daß der Abscherbolzen 33 in eine in die Kasten-Seitenwand eingearbeitete Durchbrechung eingreift oder durch Anordnung des Abscherbolzens 33 knapp unterhalb des unteren Kasten-Abschnittes 151, so wie in Fig.6 dargestellt.
Bei Drehung der Klemmschraube 16 in Öffnungsrichtung wird vom Abscherbolzen 33 zunächst jegliche Verschiebung des Kastens 15 verhindert, die Drehbewegung wird ausschließlich in ein Nach-oben-Wandern der Klemmschraube 16 umgesetzt. Wird eine ausreichend große, in ihre Längsrichtung verlaufende Druckkraft auf die Klemmschraube 16 ausgeübt (beispielsweise durch einen Schlag auf die Klemmschraube 16 oder beim Weiterdrehen der Klemmschraube 16, wenn deren Kopf 160 bereits an der Rippe 30 anliegt), wird der Abscherbolzen 33 abgeschert und der Kasten 15 kann ab jetzt völlig frei verschoben werden.
Bei dieser Variante der Realisierung des Widerstandes wird dieser nur zeitweise, nämlich nur vor Abscherung des Abscherbolzens 33 ausgeübt.
Bei intaktem Abscherbolzen 33 wird nur der Raum 18 geöffnet bzw. geschlossen, sodaß die Anschlußfahne eines Verschienungssystems mit geringem Schraub-Aufwand verbunden an die Liftklemme 1 angeschlossen werden kann.
As already explained, the lift clamp 1 in question has two points, namely the spaces 17 and 18, for clamping electrical lines, normally in the lower space 17 wires and in the upper space 18, the terminal lug of a busbar system is used.
As a rule, it is so that only one type of line, so either a bus system terminal lug or a wire is connected to one and the same terminal.
When opening the clamp, the clamping screw 16 is not only rotated, but also pressed down with the screwdriver used for this purpose. This leads in lift clamps, which have only the previously discussed design features, that the screw head 16 is always pressed against the upper frame portion 141 and the rotation of the clamping screw 16 only in a downward displacement of the box 15, ie in an opening of the room 17 is implemented. Only when the box 15 is moved completely down and comes in this position on the underlying housing part 29 to the plant, no further downward sliding of the box 15 can be done more. A still then exercised opening movement of the clamping screw 16 is converted into a post-upward displacement of the clamping screw 16, whereby the screw head 160 is lifted from the upper frame part 140 and the upper space 18 is opened.
When turning the clamping screw 16 in the closing direction of the first space 18 is closed, then the box 15 is raised until its lower portion 151 at the lower portion 141 of the frame 14 comes to rest and only then after further continued rotation of the clamping screw 16 in the closing direction of the Screw head 160 clamped pressed against the upper frame portion 140.
By this operation is conditional that then when a lift terminal 1 only a bus system terminal lug is to be connected, first the clamping screw 16 must be opened in its entirety and after insertion of the terminal lug in the room 18 must be fully closed again.
It is intended to remedy this, a time-consuming assembly process-related circumstance that the box 15 of the lift clamp 1 in the frame 14 is not held free, but slidably against a resistance. This resistance can be realized in different ways:
Thus, for example, the box 15 rub against the frame 14 or on parts of the housing. The resulting static friction between the box 15 and the frame 14 or the housing parts initially prevents the above-discussed displacement of the box 15 relative to the frame 14, bringing the clamping screw 16 when rotating in the opening direction Box 15 and frame 14 out or when turning in the closing direction in box 15 and frame 14 moves into it. The (friction) resistance is dimensioned so that it can be overcome, for example by exerting a pressure on the screw head 160. This allows that upon rotation of the clamping screw 16 - if desired - immediately the lower space 17 can be opened.
In the exemplary embodiment of the housing shown in FIG. 1, a rib 30, into which a bore 31 is embedded, is located above the screw head 160. This bore 31, which serves for the passage of the screw driver necessary for rotating the clamping screw 16, has a smaller diameter than the head 160 of the clamping screw 16.
When moving upwards the clamping screw 16, which then takes place during rotation in the opening direction, if not at the same time a pressure on the clamping screw 16 is exerted, the screw head 160 comes to rest on the rib 30. If the clamping screw 16 now continues to be rotated in the opening direction, the box 15 is pressed downwards, since the clamping screw 16 can no longer move upwards. The resistance is overcome and moved the box 15 down.
The resistance can be realized, as shown in FIG. 5, by means of a spring 32, which pretensions the box 15 in the direction of the frame 14. This spring 32 can be formed by a leaf spring or -so as shown in Figure 5 explicitly represented by a helical compression spring which is below the box 15 and at one end to the housing part 29 and the other -unter mediation of the plate 25, if one Such is provided at the lower portion 151 of the box 15 is supported.
There may be several variants of the realization of the resistor at the same time, for example, the box 15 may be mounted on both the frame 14 and the housing rubbing or it may be in addition to the frictional mounting of the box 15 on the frame 14, a spring 32 may be present.
As can be seen from these discussions of the function of the resistor, such or necessary for its realization components, regardless of a flap 24, that is, even if such a tab 24 is missing, be provided. If there is a tab 24, the resistance can be realized by friction bearing this tab 24 in the housing 12.
The previously discussed possibilities of realizing the resistor have in common that they constantly exert this resistance, ie that this resistance is not significantly changed by displacements of the box 15.
In a preferred embodiment of the invention, a shear pin 33 is provided which is secured in the housing. The shear pin 33 is positively connected to the box 15 when it is in the position shown in Figure 1 and Figure 6. This can be achieved, for example, by engaging the shear pin 33 in an aperture machined into the box sidewall, or by placing the shear pin 33 just below the lower box portion 151, as shown in FIG.
Upon rotation of the clamping screw 16 in the opening direction of the shear bolt 33 initially any displacement of the box 15 is prevented, the rotational movement is implemented exclusively in an up-wander the clamping screw 16. If a sufficiently large, extending in its longitudinal direction compressive force exerted on the clamping screw 16 (for example, by a blow to the clamping screw 16 or further rotation of the clamping screw 16, when the head 160 is already applied to the rib 30), the shear pin 33 is sheared off and the Box 15 can now be moved completely free.
In this variant of the realization of the resistance of this is only temporarily, namely exercised only before shearing the shear bolt 33.
With intact shear bolt 33 only the space 18 is opened or closed, so that the terminal lug of a busbar system connected with little effort can be connected to the lift clamp 1.

Bei der bevorzugten und in den Zeichnungen Fig.1-4 näher dargestellten Ausführungsform ist ebenfalls ein solcher Abscherbolzen 33 vorgesehen, welcher aber bloß mittelbar mit dem Kasten 15 verbunden ist:
Bei dieser Ausführungsform ist -wie oben schon näher erläutert- ein Lappen 24 vorgesehen, an welchen ein Plättchen 25 angeformt ist, mit welchem das Montageplättchen 26 einstückig ausgebildet ist. Dieses Montageplättchen 26 ist in einer, ins Gehäuse eingelassenen rechteckigen Führungsnut 34 in zur Verschiebungsrichtung des Kastens 15 paralleler Richtung verschiebbar gelagert. Zur Verbindung des Montageplättchens 26 mit dem Kasten 15 ist ein an das Montageplättchen 26 angeformter Stift 27 vorgesehen, der in eine in der Kastenseitenwand eingearbeitete Durchbrechung 28 eingreift.
Der Abscherbolzen 33 ist dabei an den Boden dieser Führungsnut 34 angeformt. Das Montageplättchen 26 weist eine Durchbrechung 35 auf, in welche der Abscherbolzen 33 eingreift (vgl. Fig.2,3). Der Abscherbolzen 33 ist dabei indirekt, nämlich unter Vermittlung des Montageplättchens 26 und des Stiftes 27 mit dem Kasten 15 verbunden.
Damit hier eine auf die Klemmschraube 16 ausgeübte Druckkraft tatsächlich nur eine Abscherung des Abscherbolzens 33, nicht aber des Stiftes 27 bewirkt, ist die Abscherfestigkeit dieses Stiftes 27 entsprechend höher als jene des Abscherbolzens 33 zu dimensionieren.
Der Abscherbolzen 33 hat bei dieser Ausführung die Nebenfunktion, daß er das Montageplättchen 26 bzw. mit diesem den Lappen 24 während der Montage des Schalters, d.h. beim Einsetzen der einzelnen Bauteile in die Gehäuse-Unterschale, an der korrekten Position hält. Das Montageplättchen 26 mit angeformten Plättchen 25 und Lappen 24 kann damit maschinell in die Unterschale eingesetzt werden, Rahmen 14 und Kasten 15 der Liftklemmen 1 können dann ohne Schwierigkeit auf das Montageplättchen 26 aufgesetzt werden.
In the preferred embodiment shown in more detail in the drawings Fig.1-4 also such a shear pin 33 is provided, which, however, is only indirectly connected to the box 15:
In this embodiment, as already explained in more detail above, a tab 24 is provided, on which a small plate 25 is formed, with which the mounting plate 26 is integrally formed. This mounting plate 26 is slidably mounted in a, recessed into the housing rectangular guide groove 34 in the direction of displacement of the box 15 parallel direction. To connect the mounting plate 26 with the box 15, an integrally formed on the mounting plate 26 pin 27 is provided, which engages in an incorporated in the box side wall opening 28.
The shear pin 33 is integrally formed on the bottom of this guide groove 34. The mounting plate 26 has an opening 35, in which the shear pin 33rd engages (see Fig.2,3). The shear pin 33 is indirectly, namely connected by the intermediary of the mounting plate 26 and the pin 27 with the box 15.
In order for a compressive force exerted on the clamping screw 16 to actually effect only a shearing of the shear pin 33, but not of the pin 27, the shearing strength of this pin 27 is correspondingly greater than that of the shear pin 33.
The shear pin 33 has in this embodiment the secondary function that he holds the mounting plate 26 and with this the flap 24 during assembly of the switch, ie when inserting the individual components in the housing lower shell, at the correct position. The mounting plate 26 with molded plates 25 and tabs 24 can thus be used by machine in the lower shell, frame 14 and box 15 of the lift clamps 1 can then be placed without difficulty on the mounting plate 26.

Claims (4)

Liftklemme (1) zum Einbau in ein Gehäuse eines elektrischen Gerätes, wie z.B. eines Leitungsschutzschalters, umfassend einen rechteckigen Rahmen (14) und einen rechteckigen Kasten (15), dessen oberer Abschnitt (150) zwischen dem oberen Abschnitt (140) und dem unteren Abschnitt (141) des Rahmens (14) angeordnet ist, womit der Kasten (15) verschiebbar im Rahmen (14) gehalten ist, umfassend weiters eine Klemmschraube (16), die durch eine in den oberen Rahmen-Abschnitt (140) eingearbeitete Durchbrechung (142) frei drehbar hindurch geführt und in ein in den oberen Abschnitt (150) des Kastens (15) eingearbeitetes Gewinde (152) eingreift, weiters einen am Kasten (15) festgelegten Lappen (24), der sich vom unteren Abschnitt (151) des Kastens (15) weg in den unterhalb des Kastens (15) liegenden Raum erstreckt und parallel zur Ebene einer benachbart zur Liftklemme (1) liegenden Öffnung (19) im Gehäuse verläuft, dadurch gekennzeichnet, daß an den Lappen (24) ein parallel zum unteren Kasten-Abschnitt (151) verlaufendes Plättchen (25) angeformt ist, vermittels welchem der Lappen (24) mit dem Kasten (15) verbunden ist.Lifting clamp (1) for installation in a housing of an electrical appliance, such as a circuit breaker comprising a rectangular frame (14) and a rectangular box (15), the upper portion (150) between the upper portion (140) and the lower portion (141) of the frame (14), whereby the box (15) is displaceably held in the frame (14), further comprising a clamping screw (16) formed by an opening (142) formed in the upper frame section (140) is freely rotatably guided and engages in a thread (152) incorporated in the upper portion (150) of the box (15), further comprising a tab (24) fixed to the box (15) extending from the lower portion (151) of the box (15) extends into the space below the box (15) and extends parallel to the plane of an adjacent to the lift clamp (1) opening (19) in the housing, characterized in that the flap (24) parallel to the lower box -A section (151) extending plate (25) is formed, by means of which the flap (24) is connected to the box (15). Liftklemme (1) nach Anspruch 1, dadurch gekennzeichnet, daß an das Plättchen (25) ein sowohl normal zu diesem als auch normal zum Lappen (24) verlaufendes Montageplättchen (26) angeformt ist, das fest mit einer Seitenwand des Kastens (15) verbunden ist.Lift clamp (1) according to claim 1, characterized in that on the plate (25) a mounting plate (26) extending both normal to it and normal to the tab (24) is formed, which is firmly connected to a side wall of the box (15) is. Liftklemme (1) nach Anspruch 2, dadurch gekennzeichnet, daß an das Montageplättchen (26) ein Stift (27) angeformt ist, der in eine in die Kasten-Seitenwand eingearbeitete Durchbrechung (28) eingreift.Lift clamp (1) according to Claim 2, characterized in that a pin (27), which engages in an opening (28) incorporated in the box side wall, is integrally formed on the mounting plate (26). Liftklemme (1) nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß in das Montageplättchen (26) eine Durchbrechung (35) eingearbeitet ist, in welche ein im Gehäuse festgelegter Abscherzapfen (33) eingreift.Lift clamp (1) according to claim 2 or 3, characterized in that in the mounting plate (26) has an opening (35) is incorporated, in which a fixed Abscherzapfen in the housing (33) engages.
EP06019161A 2001-03-20 2002-03-15 Clamping auxiliary element Expired - Lifetime EP1746619B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0044401A AT410613B (en) 2001-03-20 2001-03-20 LIFT CLAMP
EP02706504A EP1389341B8 (en) 2001-03-20 2002-03-15 Clamping auxiliary element

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP02706504A Division EP1389341B8 (en) 2001-03-20 2002-03-15 Clamping auxiliary element
EP02706504.4 Division 2002-03-15

Publications (2)

Publication Number Publication Date
EP1746619A1 true EP1746619A1 (en) 2007-01-24
EP1746619B1 EP1746619B1 (en) 2011-09-07

Family

ID=3674289

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06019161A Expired - Lifetime EP1746619B1 (en) 2001-03-20 2002-03-15 Clamping auxiliary element
EP02706504A Expired - Lifetime EP1389341B8 (en) 2001-03-20 2002-03-15 Clamping auxiliary element

Family Applications After (1)

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EP02706504A Expired - Lifetime EP1389341B8 (en) 2001-03-20 2002-03-15 Clamping auxiliary element

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EP (2) EP1746619B1 (en)
CN (2) CN100423159C (en)
AT (3) AT410613B (en)
AU (1) AU2002240690A1 (en)
CZ (1) CZ20032391A3 (en)
DE (1) DE50210642D1 (en)
DK (1) DK1746619T3 (en)
EA (1) EA004608B1 (en)
ES (2) ES2372759T3 (en)
HK (2) HK1063384A1 (en)
MY (1) MY138816A (en)
TN (1) TNSN03067A1 (en)
WO (1) WO2002075889A2 (en)

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EP1983541A1 (en) * 2007-04-19 2008-10-22 Abb Ag Screw terminal and installation device
WO2012039030A1 (en) * 2010-09-22 2012-03-29 パナソニック電工電路株式会社 Switchgear

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AT500453B8 (en) * 2004-01-27 2007-02-15 Moeller Gebaeudeautomation Kg LIFT CLAMP
DE102005039181B4 (en) * 2005-08-18 2007-05-10 Siemens Ag Connection system with positive connection cable
SE0502128L (en) * 2005-09-26 2006-12-19 Abb Ab Connection device at a rail
FR2917243B1 (en) * 2007-06-11 2009-07-10 Schneider Electric Ind Sas ELECTRICAL CONNECTION TERMINAL AND ELECTRICAL PROTECTION APPARATUS COMPRISING SUCH A TERMINAL
DE102007032841A1 (en) * 2007-07-12 2009-01-15 Abb Ag Installation switching device with insulating housing
CN102881528B (en) * 2012-09-25 2015-03-18 上海诺雅克电气有限公司 Circuit breaker

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US3539977A (en) * 1967-11-13 1970-11-10 Oskar Woertz Inh H & O Woertz Electrical terminal
DE8312142U1 (en) * 1983-04-25 1983-11-03 Murrelektronik GmbH, 7155 Oppenweiler Screw terminal
EP0559585A1 (en) * 1992-03-02 1993-09-08 Schneider Electric Sa Connector terminal with caliper of variable thickness and mounted nut
EP0687032A1 (en) * 1994-06-06 1995-12-13 Schneider Electric Sa Screw connecting terminal for an electrical assembly
EP0772256A2 (en) * 1995-11-03 1997-05-07 Legrand Electrical apparatus with connection terminals protected by a diaphragm attached with wings
WO1998053470A1 (en) * 1997-05-20 1998-11-26 Gewiss S.P.A. Electrical terminal with finger-proof protection

Cited By (3)

* Cited by examiner, † Cited by third party
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EP1983541A1 (en) * 2007-04-19 2008-10-22 Abb Ag Screw terminal and installation device
WO2012039030A1 (en) * 2010-09-22 2012-03-29 パナソニック電工電路株式会社 Switchgear
JP5629326B2 (en) * 2010-09-22 2014-11-19 パナソニック株式会社 Switchgear

Also Published As

Publication number Publication date
DE50210642D1 (en) 2007-09-20
AU2002240690A1 (en) 2002-10-03
CN100423159C (en) 2008-10-01
CN1520601A (en) 2004-08-11
ATA4442001A (en) 2002-10-15
EP1746619B1 (en) 2011-09-07
MY138816A (en) 2009-07-31
ES2290273T3 (en) 2008-02-16
HK1063384A1 (en) 2004-12-24
TNSN03067A1 (en) 2005-04-08
CN1252772C (en) 2006-04-19
AT410613B (en) 2003-06-25
CZ20032391A3 (en) 2004-02-18
EP1389341B1 (en) 2007-08-08
CN1758402A (en) 2006-04-12
EP1389341B8 (en) 2007-11-07
DK1746619T3 (en) 2011-12-12
EP1389341A2 (en) 2004-02-18
EA200301032A1 (en) 2004-02-26
ATE523892T1 (en) 2011-09-15
ATE369615T1 (en) 2007-08-15
WO2002075889A2 (en) 2002-09-26
HK1100240A1 (en) 2007-09-14
WO2002075889A3 (en) 2003-12-11
EA004608B1 (en) 2004-06-24
ES2372759T3 (en) 2012-01-26

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