EP0195816B1 - Bimetallic trigger - Google Patents

Bimetallic trigger Download PDF

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Publication number
EP0195816B1
EP0195816B1 EP85904967A EP85904967A EP0195816B1 EP 0195816 B1 EP0195816 B1 EP 0195816B1 EP 85904967 A EP85904967 A EP 85904967A EP 85904967 A EP85904967 A EP 85904967A EP 0195816 B1 EP0195816 B1 EP 0195816B1
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EP
European Patent Office
Prior art keywords
bimetal
bridge
tripping
calibration
strips
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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
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EP85904967A
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German (de)
French (fr)
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EP0195816A1 (en
Inventor
Hans-Jürgen WULFF
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Priority to AT85904967T priority Critical patent/ATE45835T1/en
Publication of EP0195816A1 publication Critical patent/EP0195816A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
    • H01H69/01—Apparatus or processes for the manufacture of emergency protective devices for calibrating or setting of devices to function under predetermined conditions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being unbalance of two or more currents or voltages
    • H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being unbalance of two or more currents or voltages with bimetal elements

Definitions

  • the invention relates to an overcurrent release according to the preamble of claim 1.
  • a trigger is e.g. B. become known from DE-OS-3 149 811.
  • separate calibration elements are provided on both sides of each bimetal strip, which are each arranged in chambers of the release bridge, on the one hand, and the differential bridge, on the other, that are open on one side.
  • These calibration elements are arranged opposite one another and are in contact with the bimetal strip. After adjustment, they are cast with a hardening plastic compound.
  • These calibration elements are designed and held in the chambers in such a way that they are positively and non-positively applied to both sides of each bimetallic strip during the calibration or adjustment process.
  • the initially loosely arranged calibration elements are to be fixed in such a way that, with uniform heating of all existing bimetal strips, the downstream switch lock of a switch is only activated when the release bridge and the differential bridge have exceeded the calibration position once defined due to the joint effect of all bimetal strips.
  • the tripping bridge should be held and only the differential bridge should be deflected to the extent that the switching lock is triggered.
  • a bimetallic release for a switch has become known, with a release bridge and a differential bridge which can be moved relative to it, between which the ends of several bimetallic strips lie, each strip being provided with a single calibration element at the free release end, which is firmly connected to the respective bimetal strip in the calibrated state of the trigger and, on the one hand, bears against the differential bridge in the direction of movement of the bimetal strip.
  • the calibration elements of the bimetal strips are designed as adjusting screws. With this arrangement, the adjustment screws of the bimetallic strips must be set for calibration and, in addition, the storage position of the release bridge and a required stop on this bridge must be set via two further set screws. The individual adjustment processes influence each other.
  • FR-A-2 134 183 the calibration of individual bimetal strips has become known.
  • a cylindrical calibration element is fastened vertically in the bimetal strips.
  • the calibration element is of square cross-section and is locked during the adjustment by twisting about its longitudinal axis in the bimetal strip, in that the harder perforated edges of the bimetal strip cut into the edges of the soft calibration element.
  • the bimetal strip is adjusted by placing each individual bimetal strip with its fastening receptacle in an adjusting device and adjusting the calibration element in this device and locking it as shown above.
  • SU-A-832 618 shows bimetallic strips made of thermal overload releases, which are also adjusted using vertical calibration elements accommodated in the free ends of the bimetallic strips. These are pin-shaped calibration elements which are guided for adjustment in receptacles with through holes fastened to the bimetallic strip and, after adjustment on a release strip, are fixed in these receptacles by heat treatment, soldering or gluing. In this arrangement, the bimetal strips are not adjusted between a trip bridge and a differential bridge. When adjusting this arrangement, a sensor is inserted between the calibration element and the release strip in order to thereby set a predetermined distance.
  • the invention has for its object to provide a reliably adjusted bimetallic release of the type mentioned and to reduce the effort required for adjustment.
  • the creation of such a bimetallic release is achieved by the characterizing features of claim 1.
  • the task. To reduce the calibration effort in the calibration of such a bimetallic release is solved by the characterizing features of claims 8 and 9.
  • Claim 8 has a calibration method and claim 9 a device for performing this calibration method for the content.
  • Each bimetallic strip has an opening at its release end for receiving a calibration element, which, after being inserted into this opening, is supported both on the release bridge and on the differential bridge and, when the bridges move during the adjustment process, is supported in the opening until it is fastened after adjustment, can move freely.
  • FIG. 1 shows a side view
  • Fig. 2 is a plan view of an adjusted bimetallic release
  • 3 and 4 show two side views of a trigger according to FIG. 1 during the adjustment process.
  • 5a to c show different designs of a bimetal at its release end.
  • 6 and 7 schematically show a top view and a side view of a device for deflecting a bimetallic release according to FIGS. 1 to 4 during the calibration process.
  • Figure 7a shows a detail of Figure 7.
  • Figures 8, 9 show a second example. 1 to 4 has a release bridge 10 which is mounted at 11 in the housing or frame of a switch, not shown.
  • a differential bridge 12 is rotatably supported at 13.
  • a transmission lever 14 of a switching mechanism On the differential bridge 12 is a transmission lever 14 of a switching mechanism. This leads to a lock on a motor protection switch or a contact on a bimetal relay.
  • 15 shows a trigger point of the switching mechanism which corresponds to the release of a lock in a motor protection switch and the snap point of the contact in the case of a bi-relay. In Fig. 1, this has a distance 16 from the end of the transmission lever 14.
  • Between the two bridges 10 and 12 are three bimetal strips 17, which are acted upon by the current of the three-pole overcurrent switch, not shown.
  • the bimetallic strips 17 carry calibration elements 19 in the form of disks at the release end 18, which are firmly connected by welding spots 20 to the end 18 of the bimetallic strips 17.
  • the disks 19 are seated in openings 21 which in this case are designed as slots open on one side according to FIG.
  • the view according to FIG. 2 shows the different position of the three bimetallic strips 17 relative to the bridges 10 and 12 due to manufacturing tolerances.
  • FIGS. 3 and 4 show two phases of the calibration method for producing the calibrated state according to FIGS. 1 and 2.
  • a device according to FIGS. 6 and 7 is used. This device is mounted in the pivot point 11 of the release bridge and each has two assigned to a bridge Claws 22, 23. Two opposing claws 22 and 23 are connected to each other by a spring 24. 3 and 4, the opposing walls of the release bridge 10 and differential bridge 12 run parallel to each other. In order to compensate for tolerances, they can also be of a slightly conical design, as the detail according to FIG. 7a shows.
  • the calibration elements 19 are loosely inserted into the openings 21 of the bimetallic strips 17. Then they are brought to the release bridge 10 and differential bridge 12 by means of the device according to FIGS. 6 and 7. By turning the device around the point 11 in the direction 25, the bridges 10 and 12 with the calibration elements 19 clamped between them are brought to the trigger point 15 of the switching mechanism. This position is shown in Fig. 3. When triggered, the device is stopped and the bimetals 17 are in this position, for. B. by heating, brought into the position in which the triggering must take place. This process is shown in Fig. 4. In this position, the calibration elements 19, z. B. by laser welding, firmly connected to the bimetals (welding points 20).
  • the advantage of the present invention is that only one calibration element is required per bimetal strip. This and the type of arrangement of this calibration element on the bimetallic strip result in low calibration effort and the possibility of carrying out a simple and reliable adjustment.
  • FIGS. 8 and 9 show an embodiment in which the bimetallic strips 17 with the calibration elements 19 attached to the ends are arranged one behind the other in the direction of bending.
  • Tripping bridge 10 'and differential bridge 12' are designed as slides lying in one plane and displaceable in this plane.
  • the ends of the bimetallic strips 17 with the calibration elements 19 each lie in individual, separate recesses between the slides 10 ', 12'. Otherwise, the mode of operation corresponds to that of the first-mentioned exemplary embodiment according to FIGS. 1 to 7.
  • the method for carrying out the calibration also corresponds to that of the first-mentioned exemplary embodiment, the device for carrying out the method having to be adapted accordingly to the changed position of the bimetal strips.

Abstract

A bimetallic trigger for a switch, for example a motor protection switch with a trigger bridge (10) and a differential bridge which can move in relation thereto, in which the ends of the bimetallic strips (17) lie between the two bridges, with the use of calibration elements (19). The task is to create a reliably adjusted bimetallic trigger and obviate the expense of adjustment. This is achieved by providing each bimetallic strip (17) with a single calibration element (19) at the free triggering end, which in the calibrated state of the trigger is firmly connected to the bimetallic strip (17) and, in the direction of movement of the bimetallic strip (17), on the one side lies against the trigger bridge (10) and on the other side against the differential bridge.

Description

Die Erfindung bezieht sich auf einen Überstromauslöser gemäß dem Oberbegriff des Anspruchs 1. Ein solcher Auslöser ist z. B. durch die DE-OS-3 149 811 bekannt geworden. Bei der bekannten Bauart sind beidseitig eines jeden Bimetallstreifens gesonderte Eichelemente vorgesehen, die jeweils in einseitig offenen Kammern der Auslösebrücke einerseits und der Differentialbrücke andererseits angeordnet sind. Diese Eichelemente sind einander gegenüberliegend angeordnet und stehen mit dem Bimetallstreifen in Berührung. Sie sind nach dem Justieren mit einer aushärtenden Kunststoffmasse vergossen. Diese Eichelemente sind derart ausgebildet und in den Kammern gehalten, daß sie beim Eich- oder Justiervorgang an den beiden Seiten jedes Bimetallstreifens jeweils gleichzeitig unter Krafteinwirkung form- und kraftschlüssig anliegen. Die zunächst lose angeordneten Eichelemente sollen so fixiert werden, daß bei einer gleichmäßigen Erwärmung aller vorhandenen Bimetallstreifen das nachgeschaltete Schaltschloß eines Schalters erst dann betätigt wird, wenn die Auslösebrücke und die Differentialbrücke durch die gemeinsame Wirkung aller Bimetallstreifen die einmal festgelegte Eichstellung überschritten haben. Bei Ausfall einer Stromphase beispielsweise soll die Auslösebrücke festgehalten und nur die Differentialbrücke soweit ausgelenkt werden, daß das Schaltschloß ausgelöst wird.The invention relates to an overcurrent release according to the preamble of claim 1. Such a trigger is e.g. B. become known from DE-OS-3 149 811. In the known design, separate calibration elements are provided on both sides of each bimetal strip, which are each arranged in chambers of the release bridge, on the one hand, and the differential bridge, on the other, that are open on one side. These calibration elements are arranged opposite one another and are in contact with the bimetal strip. After adjustment, they are cast with a hardening plastic compound. These calibration elements are designed and held in the chambers in such a way that they are positively and non-positively applied to both sides of each bimetallic strip during the calibration or adjustment process. The initially loosely arranged calibration elements are to be fixed in such a way that, with uniform heating of all existing bimetal strips, the downstream switch lock of a switch is only activated when the release bridge and the differential bridge have exceeded the calibration position once defined due to the joint effect of all bimetal strips. In the event of a power phase failure, for example, the tripping bridge should be held and only the differential bridge should be deflected to the extent that the switching lock is triggered.

Weiterhin ist aus der GB-A-1 124 939 ein Bimetallauslöser für einen Schalter bekannt geworden, mit einer Auslösebrücke und einer relativ dazu bewegbaren Differentialbrücke, zwischen denen die Enden mehrerer Bimetallstreifen liegen, wobei jeder Streifen am freien Auslöseende mit einem einzigen Eichelement versehen ist, das im geeichten Zustand des Auslösers mit dem jeweiligen Bimetallstreifen fest verbunden ist und in Bewegungsrichtung des Bimetallstreifens einerseits an der Differentialbrücke anliegt. Die Eichelemente der Bimetallstreifen sind als Justierschrauben ausgebildet. Zur Eichung sind bei dieser Anordnung die Justierschrauben der Bimetallstreifen einzustellen und außerdem ist über zwei weitere Stellschrauben die Lagerposition der Auslösebrücke sowie ein erforderlicher Anschlag auf diese Brücke einzustellen. Dabei beeinflussen sich die einzelnen Justiervorgänge gegenseitig.Furthermore, from GB-A-1 124 939 a bimetallic release for a switch has become known, with a release bridge and a differential bridge which can be moved relative to it, between which the ends of several bimetallic strips lie, each strip being provided with a single calibration element at the free release end, which is firmly connected to the respective bimetal strip in the calibrated state of the trigger and, on the one hand, bears against the differential bridge in the direction of movement of the bimetal strip. The calibration elements of the bimetal strips are designed as adjusting screws. With this arrangement, the adjustment screws of the bimetallic strips must be set for calibration and, in addition, the storage position of the release bridge and a required stop on this bridge must be set via two further set screws. The individual adjustment processes influence each other.

Aus der FR-A-2 134 183 ist die Eichung von einzelnen Bimetallstreifen bekanntgeworden. An den freien Enden der Bimetallstreifen ist ein zylinderförmiges Eichelement senkrecht in den Bimetallstreifen befestigt. Das Eichelement ist von viereckigem Querschnitt und wird während der Justierung durch Verdrehung um seine Längsachse in dem Bimetallstreifen verriegelt, indem sich die härteren Lochkanten des Bimetallstreifens in die Kanten des weichen Eichelementes schneiden. Die Justierung des Bimetallstreifens erfolgt dadurch, daß jeder einzelne Bimetallstreifen mit seiner Befestigungsaufnahme in eine Justiervorrichtung gesetzt wird und das Eichelement in dieser Vorrichtung eingestellt und wie vorangehend dargestellt verriegelt wird.From FR-A-2 134 183 the calibration of individual bimetal strips has become known. At the free ends of the bimetal strips, a cylindrical calibration element is fastened vertically in the bimetal strips. The calibration element is of square cross-section and is locked during the adjustment by twisting about its longitudinal axis in the bimetal strip, in that the harder perforated edges of the bimetal strip cut into the edges of the soft calibration element. The bimetal strip is adjusted by placing each individual bimetal strip with its fastening receptacle in an adjusting device and adjusting the calibration element in this device and locking it as shown above.

Die SU-A-832 618 zeigt Bimetallstreifen aus thermischen Überlastauslösern, die ebenfalls über senkrechte in den freien Enden der Bimetallstreifen aufgenommene Eichelemente justiert werden. Es handelt sich dabei um stiftförmige Eichelemente, die für die Justierung beweglich in am Bimetallstreifen befestigten Aufnahmen mit Durchgangslöchern geführt sind und nach Justierung an einem Auslösestreifen in diesen Aufnahmen durch Wärmebehandlung, Löten oder Kleben festgelegt werden. In dieser Anordnung werden die Bimetallstreifen nicht zwischen einer Auslöse- und einer Differentialbrücke justiert. Bei der Justierung dieser Anordnung wird zwischen Eichelement und Auslösestreifen ein Fühler gesteckt, um dadurch einen vorbestimmten Abstand einzustellen.SU-A-832 618 shows bimetallic strips made of thermal overload releases, which are also adjusted using vertical calibration elements accommodated in the free ends of the bimetallic strips. These are pin-shaped calibration elements which are guided for adjustment in receptacles with through holes fastened to the bimetallic strip and, after adjustment on a release strip, are fixed in these receptacles by heat treatment, soldering or gluing. In this arrangement, the bimetal strips are not adjusted between a trip bridge and a differential bridge. When adjusting this arrangement, a sensor is inserted between the calibration element and the release strip in order to thereby set a predetermined distance.

Der Erfindung liegt die Aufgabe zugrunde, einen zuverlässig justierten Bimetallauslöser der eingangs genannten Art zu schaffen und den bei der Justage erforderlichen Aufwand zu vermindern. Die Schaffung eines derartigen Bimetallauslösers wird durch die kennzeichnenden Merkmale des Anspruches 1 erreicht. Die Aufgabe. den Eichaufwand bei der Eichung eines derartigen Bimetallauslösers zu vermindern, wird durch die kennzeichnenden Merkmale der Ansprüche 8 und 9 gelöst. Anspruch 8 hat ein Eichverfahren und Anspruch 9 eine Vorrichtung zur Durchführung dieses Eichverfahrens zum Inhalt. So ist jeder Bimetallstreifen an seinem Auslöseende mit einer Öffnung zur Aufnahme eines Eichelementes versehen, das sich nach Einlegen in diese Öffnung sowohl an der Auslösebrücke als auch an der Differentialbrücke abstützt und sich bei einer Bewegung der Brücken während des Justiervorganges in der Öffnung, bis zur Befestigung nach erfolgter Justierung, frei bewegen kann.The invention has for its object to provide a reliably adjusted bimetallic release of the type mentioned and to reduce the effort required for adjustment. The creation of such a bimetallic release is achieved by the characterizing features of claim 1. The task. To reduce the calibration effort in the calibration of such a bimetallic release is solved by the characterizing features of claims 8 and 9. Claim 8 has a calibration method and claim 9 a device for performing this calibration method for the content. Each bimetallic strip has an opening at its release end for receiving a calibration element, which, after being inserted into this opening, is supported both on the release bridge and on the differential bridge and, when the bridges move during the adjustment process, is supported in the opening until it is fastened after adjustment, can move freely.

In der Zeichnung ist in den Figuren 1 bis 9 ein Ausführungsbeispiel des Gegenstandes gemäß der Erfindung schematisch dargestellt. Fig 1 zeigt eine Seitenansicht und Fig. 2 eine Draufsicht eines justierten Bimetallauslösers. Fig. 3 und 4 zeigen zwei Seitenansichten eines Auslösers gemäß Fig. 1 während des Justiervorganges. Fig. 5a bis c zeigen verschiedene Ausbildungen eines Bimetalles an seinem Auslöseende. Fig. 6 und 7 zeigen schematisch in einer Draufsicht und in einer Seitenansicht eine Vorrichtung zum Auslenken eines Bimetallauslösers nach Fig. 1 bis 4 bei dem Eichvorgang. Fig. 7a zeigt eine Einzelheit von Fig. 7. Fig. 8, 9 zeigen ein zweites Beispiel. Der Bimetallauslöser gemäß Fig. 1 bis 4 besitzt eine Auslösebrücke 10, die bei 11 im Gehäuse oder Rahmen eines nicht dargestellten Schalters gelagert ist. An der Auslösebrücke 10 ist eine Differentialbrücke 12 bei 13 drehbar gelagert. An der Differentialbrücke 12 liegt ein Übertragungshebel 14 eines Schaltmechanismus. Dieser führt zu einem Schloß bei einem Motorschutzschalter oder einem Kontakt bei einem Bimetall-Relais. Mit 15 ist ein Auslösepunkt des Schaltmechanismus dargestellt, der bei einem Motorschutzschalter der Entklinkung eines Schlosses und bei einem Bi-Relais dem Umschnappunkt des Kontaktes entspricht. Dieser hat in Fig. 1 einen Abstand 16 von dem Ende des Übertragungshebels 14. Zwischen den beiden Brücken 10 und 12 liegen drei Bimetallstreifen 17, die vom Strom des nicht dargestellten dreipoligen Überstromschalters beaufschlagt werden. Die Bimetallstreifen 17 tragen am Auslöseende 18 als Scheiben ausgebildete Eichelemente 19, die durch Schweißpunkte 20 mit dem Ende 18 der Bimetallstreifen 17 fest verbunden sind. Die Scheiben 19 sitzen in Öffnungen 21, die gemäß Fig. 5a in diesem Falle als einseitig offene Schlitze ausgebildet sind. Aus der Ansicht gemäß Fig. 2 ist die durch Fertigungstoleranzen bedingte unterschiedliche Stellung der drei Bimetallstreifen 17 gegenüber den Brücken 10 und 12 zu erkennen.In the drawing, an embodiment of the object according to the invention is shown schematically in Figures 1 to 9. Fig. 1 shows a side view and Fig. 2 is a plan view of an adjusted bimetallic release. 3 and 4 show two side views of a trigger according to FIG. 1 during the adjustment process. 5a to c show different designs of a bimetal at its release end. 6 and 7 schematically show a top view and a side view of a device for deflecting a bimetallic release according to FIGS. 1 to 4 during the calibration process. Figure 7a shows a detail of Figure 7. Figures 8, 9 show a second example. 1 to 4 has a release bridge 10 which is mounted at 11 in the housing or frame of a switch, not shown. On the release bridge 10, a differential bridge 12 is rotatably supported at 13. On the differential bridge 12 is a transmission lever 14 of a switching mechanism. This leads to a lock on a motor protection switch or a contact on a bimetal relay. 15 shows a trigger point of the switching mechanism which corresponds to the release of a lock in a motor protection switch and the snap point of the contact in the case of a bi-relay. In Fig. 1, this has a distance 16 from the end of the transmission lever 14. Between the two bridges 10 and 12 are three bimetal strips 17, which are acted upon by the current of the three-pole overcurrent switch, not shown. The bimetallic strips 17 carry calibration elements 19 in the form of disks at the release end 18, which are firmly connected by welding spots 20 to the end 18 of the bimetallic strips 17. The disks 19 are seated in openings 21 which in this case are designed as slots open on one side according to FIG. The view according to FIG. 2 shows the different position of the three bimetallic strips 17 relative to the bridges 10 and 12 due to manufacturing tolerances.

Fig. 3 und 4 zeigen zwei Phasen des Eichverfahrens zur Herstellung des geeichten Zustandes gemäß Fig. 1 und 2. Verwendet wird dabei eine Vorrichtung gemäß Fig. 6 und 7. Diese Vorrichtung ist im Drehpunkt 11 der Auslösebrücke gelagert und besitzt jeweils zwei einer Brücke zugeordnete Klauen 22, 23. Je zwei gegenüberliegende Klauen 22 und 23 sind durch eine Feder 24 miteinander verbunden. Gemäß Fig. 3 und 4 verlaufen die einander gegenüberliegenden Wandungen der Auslösebrücke 10 und Differentialbrücke 12 parallel zueinander. Sie können auch, um Toleranzen auszugleichen, schwach konisch ausgebildet sein, wie dies die Einzelheit gemäß Fig. 7a zeigt.3 and 4 show two phases of the calibration method for producing the calibrated state according to FIGS. 1 and 2. A device according to FIGS. 6 and 7 is used. This device is mounted in the pivot point 11 of the release bridge and each has two assigned to a bridge Claws 22, 23. Two opposing claws 22 and 23 are connected to each other by a spring 24. 3 and 4, the opposing walls of the release bridge 10 and differential bridge 12 run parallel to each other. In order to compensate for tolerances, they can also be of a slightly conical design, as the detail according to FIG. 7a shows.

Zur Eichung werden die Eichelemente 19 in die Öffnungen 21 der Bimetallstreifen 17 lose eingelegt. Sodann werden sie mittels der Vorrichtung nach Fig. 6 und 7 formschlüssig zur Auslösebrücke 10 und Differentialbrücke 12 gebracht. Durch Drehen der Vorrichtung um den Punkt 11 in Richtung 25 werden die Brücken 10 und 12 mit den zwischen ihnen eingeklemmten Eichelementen 19 zum Auslösepunkt 15 des Schaltmechanismus gebracht. Diese Stellung zeigt Fig. 3. Bei Auslösung wird die Vorrichtung angehalten und die Bimetalle 17 werden in dieser Stellung, z. B. durch Erwärmen, in die Position gebracht, bei der die Auslösung erfolgen muß. Dieser Vorgang ist in Fig. 4 dargestellt. In dieser Position werden die Eichelemente 19, z. B. durch Laserschweißen, fest mit den Bimetallen verbunden (Schweißpunkte 20).For calibration, the calibration elements 19 are loosely inserted into the openings 21 of the bimetallic strips 17. Then they are brought to the release bridge 10 and differential bridge 12 by means of the device according to FIGS. 6 and 7. By turning the device around the point 11 in the direction 25, the bridges 10 and 12 with the calibration elements 19 clamped between them are brought to the trigger point 15 of the switching mechanism. This position is shown in Fig. 3. When triggered, the device is stopped and the bimetals 17 are in this position, for. B. by heating, brought into the position in which the triggering must take place. This process is shown in Fig. 4. In this position, the calibration elements 19, z. B. by laser welding, firmly connected to the bimetals (welding points 20).

Mit der vorliegenden Erfindung wird der Vorteil erreicht, daß pro Bimetallstreifen nur noch ein Eichelement nötig ist. Damit und durch die Art der Anordnung dieses Eichelementes am Bimetallstreifen ergibt sich ein geringer Eichaufwand und die Möglichkeit zur Durchführung einer einfachen und zuverlässigen Justage.The advantage of the present invention is that only one calibration element is required per bimetal strip. This and the type of arrangement of this calibration element on the bimetallic strip result in low calibration effort and the possibility of carrying out a simple and reliable adjustment.

Fig. 8 und 9 zeigen ein Ausführungsbeispiel, bei dem die Bimetallstreifen 17 mit den endseitig angebrachten Eichelementen 19 in Ausbiegerichtung hintereinander angeordnet sind. Auslösebrücke 10' und Differentialbrücke 12' sind als in einer Ebene liegende, in dieser Ebene verschiebbare Schieber ausgebildet. Die Enden der Bimetallstreifen 17 mit den Eichelementen 19 liegen jeweils in einzelnen, gesonderten Ausnehmungen zwischen den Schiebern 10', 12'. Im übrigen entspricht die Wirkungsweise der des erstgenannten Ausführungsbeispieles gemäß Fig. 1 bis 7.8 and 9 show an embodiment in which the bimetallic strips 17 with the calibration elements 19 attached to the ends are arranged one behind the other in the direction of bending. Tripping bridge 10 'and differential bridge 12' are designed as slides lying in one plane and displaceable in this plane. The ends of the bimetallic strips 17 with the calibration elements 19 each lie in individual, separate recesses between the slides 10 ', 12'. Otherwise, the mode of operation corresponds to that of the first-mentioned exemplary embodiment according to FIGS. 1 to 7.

Das Verfahren zur Durchführung der Eichung entspricht im Prinzip ebenfalls dem des erstgenannten Ausführungsbeispieles, wobei die Vorrichtung zur Durchführung des Verfahrens der geänderten Lage der Bimetallstreifen entsprechend angepasst werden muß.In principle, the method for carrying out the calibration also corresponds to that of the first-mentioned exemplary embodiment, the device for carrying out the method having to be adapted accordingly to the changed position of the bimetal strips.

Claims (10)

1. Bimetal tripping device for a switch, for example a motor protection switch, with a tripping bridge (10) and a differential bridge (12) movable relative thereto, between which lie the ends (18) of several bimetal strips (17), wherein each bimetal strip (17) is provided at the free tripping end (18) with a single calibration element (19), which in the calibrated state of the tripping device is firmly connected with the respective bimetal strip (17) and in direction of movement of the bimetal strip (17) on the one hand lies against the differential bridge (12), characterised thereby, that the calibration element (19) of the bimetal strip (17) on the other hand lies against the tripping bridge (10) and is received in a one-sidedly open slot (21a) of the end (18) of the bimetal strip (17).
2. Bimetal tripping device according to claim 1, characterised thereby, that the calibration element (19) is connected with the bimetal strip (17) by gluing, for example by a rapidly setting adhesive substance.
3. Bimetal tripping device according to claim 1, characterised thereby, that the calibration element (19) is connected with the bimetal strip (17) by welding, for example by arc welding or laser welding.
4. Bimetal tripping device according to one of the claims 1 to 3, characterised thereby, that the calibration elements (19) extending in deflecting direction are constructed as pins, discs or balls.
5. Bimetal tripping device according to one of the claims 1 to 4, characterised thereby, that the calibration element (19) is provided with a notch (19a) at the side inserted into the slot (21 a).
6. Bimetal tripping device according to one of the claims 1 to 9, characterised thereby, that the calibration element (19) after insertion into the slot (21a) bears against the tripping bridge (10) as well as also against the differential bridge (12) and is freely movable in the slot (21a) on movement of the bridges (10, 12) during the adjusting operation until being fastened after adjustment has taken place.
7. Bimetal tripping device according to one of the claims 1 to 6, characterised thereby, that the bimetal strips (17), as seen in deflecting direction, are arranged one beside the other and that the ends (18) provided with the calibration elements (19) lie in a common space between the tripping bridge (10) and the differential bridge (12).
8. Bimetal tripping device according to one of the claims 1 to 6, characterised thereby, that the bimetal strips (17), as seen in deflecting direction, are arranged one behind the other and that the ends (18) provided with the calibration elements (19) each lie in individual recesses which are formed between the tripping bridge (10') constructed as slide and the differential bridge (12') constructed as slide and lying in the same plane.
9. Method for the calibration of a bimetal tripping device according to one of the claims 1 to 6 or according to claim 7 or 8, characterised by the following steps:
a) the calibration elements (19) are laid loosely into one-sidedly open slots (21a) of the bimetal strips (17),
b) these calibration elements (19) are brought into shape-locking with the tripping bridge (10) and the differential bridge (12) by means of a device (22 to 24),
c) the bridges (10, 12) and the calibration elements (19) are rotated by means of the device (22 to 24) around the rotational centre (11) of the tripping bridge (10) in direction (25) until reaching the tripping point (15),
d) in this position of the bridges (10, 12) and the calibration elements (19) wedged in by the bridges, the bimetal strips (17) are brought, for example by heating, into the position, in which the tripping must take place, and
e) after reaching this position, the calibration elements (19) are firmly connected with the bimetal strips (17), for example by welding or gluing.
10. Device for the performance of a method according to claim 9, characterised thereby, that the device comprises claws (22, 23), each two of which respectively engage around the tripping bridge (10) and the differential bridge (12), and that each two mutually opposite claws (22, 23) are connected one with the other by a respective tension spring (24) and that the device is borne in the rotational centre (11) of the tripping bridge (10).
EP85904967A 1984-09-26 1985-09-20 Bimetallic trigger Expired EP0195816B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85904967T ATE45835T1 (en) 1984-09-26 1985-09-20 BIMETAL RELEASE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843435228 DE3435228A1 (en) 1984-09-26 1984-09-26 BIMETAL RELEASE
DE3435228 1984-09-26

Publications (2)

Publication Number Publication Date
EP0195816A1 EP0195816A1 (en) 1986-10-01
EP0195816B1 true EP0195816B1 (en) 1989-08-23

Family

ID=6246353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85904967A Expired EP0195816B1 (en) 1984-09-26 1985-09-20 Bimetallic trigger

Country Status (5)

Country Link
US (1) US4691184A (en)
EP (1) EP0195816B1 (en)
DE (2) DE3435228A1 (en)
DK (1) DK167785B1 (en)
WO (1) WO1986002197A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3877854D1 (en) * 1987-07-24 1993-03-11 Maier & Cie C OAKING THE THERMAL RELEASE ELEMENT IN A INSTALLATION SWITCH.
DE19548479C2 (en) * 1995-12-22 1999-09-02 Siemens Ag Thermal release system
FR2746542B1 (en) * 1996-03-20 1998-04-24 Schneider Electric Sa DIFFERENTIAL THERMAL TRIGGER IN BILAMES
DE19619295C2 (en) * 1996-05-13 2003-10-23 Siemens Ag Adjustment procedure for thermal overload releases
CN1071050C (en) * 1996-09-30 2001-09-12 西门子公司 Method and device for regulating hot overload circuit breaker
US6095678A (en) * 1997-06-11 2000-08-01 Rockwell Technologies, Llc Method of calibrating a thermal trigger for an electrical switching device
JP4045709B2 (en) * 1999-04-02 2008-02-13 富士電機機器制御株式会社 Thermal overload trip device for circuit breaker
JP2002093298A (en) * 2000-09-18 2002-03-29 Fuji Electric Co Ltd Circuit breaker
DE112004002905A5 (en) * 2004-04-23 2007-05-24 Siemens Ag Overload release and adjustment procedure for the same
DE102011078634A1 (en) 2011-07-05 2013-01-10 Siemens Aktiengesellschaft Overload release, especially for a circuit breaker
CN102867707B (en) * 2012-09-21 2015-10-28 德力西电气有限公司 A kind ofly regulate the thermal overload dropout three-phase synchronous method of two gold and device thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT230980B (en) * 1961-04-07 1964-01-10 Eduard Dr Schrack Trip unit for devices for overload and phase failure protection in multi-phase circuits
NL127861C (en) * 1964-12-28
FR2134183B1 (en) * 1971-04-23 1974-03-08 Merlin Gerin
DE3149811A1 (en) * 1981-12-16 1983-07-21 Klöckner-Moeller Elektrizitäts GmbH, 5300 Bonn Multi-phase thermally delayed motor protection switch

Also Published As

Publication number Publication date
EP0195816A1 (en) 1986-10-01
DK207486D0 (en) 1986-05-05
DK207486A (en) 1986-05-05
DE3435228A1 (en) 1986-04-03
DE3572562D1 (en) 1989-09-28
WO1986002197A1 (en) 1986-04-10
US4691184A (en) 1987-09-01
DK167785B1 (en) 1993-12-13

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