EP1085551A2 - Latching device for a switch - Google Patents
Latching device for a switch Download PDFInfo
- Publication number
- EP1085551A2 EP1085551A2 EP00119982A EP00119982A EP1085551A2 EP 1085551 A2 EP1085551 A2 EP 1085551A2 EP 00119982 A EP00119982 A EP 00119982A EP 00119982 A EP00119982 A EP 00119982A EP 1085551 A2 EP1085551 A2 EP 1085551A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lever
- ratchet lever
- abutment
- ratchet
- contact
- 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
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/505—Latching devices between operating and release mechanism
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
- H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure
Definitions
- the invention relates to a latching device for an electrical switch, in particular for a circuit breaker.
- the overstroke required for the manufacturing accuracy and possible contact erosion which is required beyond the dead center, influences the time between the occurrence of an overcurrent leading to tripping and lifting the contact.
- DE -OS 15 63 781 A1 contains a switching mechanism, the knee joint of which consists of the switching lever and a link which is articulated and resiliently formed therein.
- the link in turn is connected to the shift lever, which is designed as a two-armed lever and is rotatably mounted in an elongated hole by means of an axis of rotation
- DE 197 01 470 C1 includes a switching mechanism in which an over-center position is achieved with the aid of a knee joint, the overstroke of the knee joint required for generating the contact pressure and for tolerance compensation and contact erosion by an evasive movement which changes the length of one of the knee joints Leg causes, is generated.
- the part of the knee joint which serves as a ratchet lever acts directly on the contact lever which is rotatably mounted on a fixed axis.
- the object of the invention is to design the latching device so that at lowest possible number and mass of the parts moving during the shutdown optimal release of the latching in both the thermal and the magnetic release occurs.
- a latching device of an electrical switch in particular a circuit breaker, must meet different requirements for thermal and magnetic unlatching.
- the forces and distances required for this must remain as constant as possible (unlatching work remains constant).
- Typical are toggle lever solutions in which the ratio of the lever arm lengths to the diameters of the bearing axles determine the influence of the coefficient of friction.
- the two contact partners in the case of a magnetic release (short circuit), the two contact partners must be separated as quickly as possible, which cannot be adequately achieved with a conventional toggle lever solution.
- a complete separation of the two locking partners is advantageous here (free movement of the contact unaffected by the other locking partner and thus lower masses that have to be accelerated).
- the key factor is the release path. Unlatching force fluctuations play a minor role in this case.
- a sudden increase in the force P causes the latch lever 2 to slide off the latch lever abutment 3 due to the inertia of the latch lever abutment 3 and thus a decoupling of both parts (principle of latching).
- the contact lever 4 can move unaffected and thus move faster.
- ratchet lever 2 and ratchet lever abutment 3 there is now sliding and no rotational movement, which is the essential content of the invention.
- the force P2 causes the contact pressure at the contact point 4A in the switched-on state and holds the contact lever 4 in its switched-off position when the switch is switched off.
Landscapes
- Breakers (AREA)
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
- Mechanisms For Operating Contacts (AREA)
Abstract
Verklinkungseinrichtung für einen elektrischen Schalter, insbesondere für einen Leitungsschutzschalter, mit einem Schalthebel (1), an dem schwenkbar ein Klinkenhebel (2) angelenkt ist, der mit dem am Kontakthebel (4) angeordneten Klinkenhebelwiderlager (3) ein Kniegelenk (2;3) bildet, durch das eine Übertotpunktlage bewirkt wird. Das Klinkenhebelwiderlager (3) an dem der Kontaktstelle (4A) gegenüberliegenden Arm des Kontakthebels (4) ist so gestaltet und schwenkbar befestigt, daß es zwei unterschiedliche Entklinkungsabläufe zuläßt. <IMAGE>Latching device for an electrical switch, in particular for a circuit breaker, with a switching lever (1) on which a ratchet lever (2) is pivotably articulated, which forms a knee joint (2; 3) with the ratchet lever abutment (3) arranged on the contact lever (4) , which causes an overdead position. The pawl lever abutment (3) on the arm of the contact lever (4) opposite the contact point (4A) is designed and pivotably attached so that it allows two different unlatching processes. <IMAGE>
Description
Die Erfindung betrifft eine Verklinkungseinrichtung für einen elektrischen Schalter,
insbesondere für einen Leitungsschutzschalter.
Bei den bekannten Ausführungen DE 35 17 748 C1, DE 195 07 605 C1 und
DE 41 16 454 C2 beeinflußt der für die Fertigungsgenauigkeit und eventuellen
Kontaktabbrand benötigte Überhub, der über den Totpunkt hinaus erforderlich ist, die
Zeitspanne zwischen dem Auftreten eines zum Auslösen führenden Überstromes und
dem Abheben des Kontaktes.
Die DE -OS 15 63 781 A1 beinhaltet einen Schaltmechanismus, dessen Kniegelenk
aus dem Schalthebel und einem daran angelenkten, in sich federnd ausgebildeten,
Glied besteht. Das Glied wiederum ist mit dem Schalthebel verbunden, der als
zweiarmiger Hebel ausgebildet ist und mittels einer Drehachse in einem Langloch
drehbar gelagert ist
Die DE 197 01 470 C1 beinhaltet einen Schaltmechanismus, bei der mit Hilfe eines
Kniegelenks eine Übertotpunktlage bewirkt wird, wobei der für die Erzeugung des
Kontaktdrucks sowie für den Toleranzausgleich und Kontaktabbrands erforderliche
Überhub des Kniegelenks durch eine Ausweichbewegung, die eine Längenänderung
eines der das Kniegelenk bildenden Schenkel bewirkt, erzeugt wird. Dabei wirkt der als
Klinkenhebel dienende Teil des Kniegelenks unmittelbar auf den an einer ortsfesten
Achse drehbar gelagerten Kontakthebel ein.The invention relates to a latching device for an electrical switch, in particular for a circuit breaker.
In the known versions DE 35 17 748 C1, DE 195 07 605 C1 and DE 41 16 454 C2, the overstroke required for the manufacturing accuracy and possible contact erosion, which is required beyond the dead center, influences the time between the occurrence of an overcurrent leading to tripping and lifting the contact.
DE -OS 15 63 781 A1 contains a switching mechanism, the knee joint of which consists of the switching lever and a link which is articulated and resiliently formed therein. The link in turn is connected to the shift lever, which is designed as a two-armed lever and is rotatably mounted in an elongated hole by means of an axis of rotation
DE 197 01 470 C1 includes a switching mechanism in which an over-center position is achieved with the aid of a knee joint, the overstroke of the knee joint required for generating the contact pressure and for tolerance compensation and contact erosion by an evasive movement which changes the length of one of the knee joints Leg causes, is generated. The part of the knee joint which serves as a ratchet lever acts directly on the contact lever which is rotatably mounted on a fixed axis.
Aufgabe der Erfindung ist, die Verklinkungseinrichtung so auszubilden, daß bei geringstmöglicher Anzahl und Masse der bei der Abschaltung bewegten Teile eine optimale Aufhebung der Verklinkung sowohl bei der thermischen als auch bei der magnetischen Auslösung erfolgt.The object of the invention is to design the latching device so that at lowest possible number and mass of the parts moving during the shutdown optimal release of the latching in both the thermal and the magnetic release occurs.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des
Patentanspruches 1 gelöst.
Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the characterizing features of
Advantageous embodiments of the invention are the subject of the dependent claims.
Eine Verklinkungseinrichtung eines elektrischen Schalters, insbesondere eines
Leitungsschutzschalters, muß bei der thermischen und bei der magnetischen
Entklinkung unterschiedliche Anforderungen erfüllen.
Um einen möglichst konstanten Zeitpunkt der thermischen Entklinkung zu erreichen,
müssen die dafür benötigten Kräfte und Wege möglichst gleich bleiben (Entklinkarbeit
bleibt konstant). Da sich aber die Reibwerte und damit die Entklinkkräfte bei häufigem
Betätigen (Oberflächenverschleiß) verändern, ist es sinnvoll, den Einfluß durch eine
entsprechende Übersetzung gering zu halten. Typisch sind Kniehebellösungen, bei
denen das Verhältnis der Hebelarmlängen zu den Durchmessern der Lagerachsen den
Reibwerteinfluß bestimmen.
Bei einer magnetischen Auslösung (Kurzschlußfall) ist im Gegensatz hierzu ein
möglichst schnelles Trennen der beiden Kontaktpartner voneinander notwendig, was
mit einer herkömmlichen Kniehebellösung nicht hinreichend realisiert werden kann.
Hier ist eine völlige Trennung der beiden Verklinkungspartner von Vorteil (freie
Beweglichkeit des Kontaktes unbeeinflußt vom anderen Verklinkungspartner und damit
geringere Massen, die beschleunigt werden müssen). Bestimmende Größe ist der
Entklinkweg. Entklinkkraftschwankungen spielen in diesem Fall eine untergeordnete
Rolle.A latching device of an electrical switch, in particular a circuit breaker, must meet different requirements for thermal and magnetic unlatching.
In order to achieve as constant a time as possible for thermal unlatching, the forces and distances required for this must remain as constant as possible (unlatching work remains constant). However, since the coefficients of friction and thus the unlatching forces change with frequent actuation (surface wear), it makes sense to keep the influence low by using an appropriate gear ratio. Typical are toggle lever solutions in which the ratio of the lever arm lengths to the diameters of the bearing axles determine the influence of the coefficient of friction.
In contrast, in the case of a magnetic release (short circuit), the two contact partners must be separated as quickly as possible, which cannot be adequately achieved with a conventional toggle lever solution. A complete separation of the two locking partners is advantageous here (free movement of the contact unaffected by the other locking partner and thus lower masses that have to be accelerated). The key factor is the release path. Unlatching force fluctuations play a minor role in this case.
Mit der in der Abbildung dargestellten Verklinkungseinrichtung sind für beide
Auslösefälle (thermisch bei Überstrom und magnetisch bei Kurzschluß) ideale
Bedingungen realisierbar, da bei einem langsamen Kraftanstieg P (thermische
Entklinkung) am Klinkenhebel sich die die Verklinkung bewirkenden Teile, Klinkenhebel
2 und Klinkenhebelwiderlager 3, durch eine Drehbewegung an der Gelenkstelle 3A bis
über die Totpunktlage hinaus entklinken. Die Reibungen in den Drehpunkten werden
untersetzt und Änderungen dieser haben einen geringeren Einfluß (Kniehebeiprinzip).
Ein sprungartiger Anstieg der Kraft P (Kurzschlußfall) bewirkt dagegen ein Abgleiten
des Klinkenhebels 2 vom Klinkenhebelwiderlager 3 aufgrund der Massenträgheit des
Klinkenhebelwiderlagers 3 und somit eine Entkopplung beider Teile (Prinzip einer
Verrastung). Der Kontakthebel 4 kann sich unbeeinflußt und damit schneller bewegen.
An der Gelenkstelle 3A des Kniehebelpaares, Klinkenhebel 2 und Klinkenhebelwiderlager
3, findet jetzt ein Abgleiten und keine Drehbewegung statt, was der
wesentliche Inhalt der Erfindung ist.
Beim Einschaltvorgang wird der Klinkenhebel 2 durch die Einklinkkraft P1 gegen das
Klinkenhebelwiderlager 3 bewegt, bis sich beide Teile, Klinkenhebel 2 und Klinkenhebelwiderlager
3, in der Übertotpunktlage stabilisieren.
Die Kraft P2 bewirkt im eingeschalteten Zustand des Schalters den Kontaktdruck an
der Kontaktstelle 4A und halt im abgeschalteten Zustand des Schalters den Kontakthebel
4 in seiner Ausschaltstellung.
When switching on, the
The force P2 causes the contact pressure at the
Claims (3)
dadurch gekennzeichnet,
daß das Klinkenhebelwiderlager (3) an dem der Kontaktstelle (4A) gegenüberliegenden Arm des Kontakthebels (4) so gestaltet und schwenkbar befestigt ist, daß es eine Entklinkung durch eine Drehbewegung des Klinkenhebelwiderlagers (3) an seiner Gelenkstelle sowie eine Entklinkung durch Abgleiten des Klinkenhebels (2) zuläßt.Latching device for an electrical switch, in particular for a circuit breaker, with a switching lever (1) on which a ratchet lever (2) is pivotably articulated, which forms a knee joint (2; 3) with the ratchet lever abutment (3) arranged on the contact lever (4) , which causes an overdead position
characterized,
that the pawl lever abutment (3) on the arm of the contact lever (4) opposite the contact point (4A) is designed and pivoted so that it can be unlatched by rotating the pawl lever abutment (3) at its hinge point and unlatched by sliding the pawl lever ( 2) allows.
dadurch gekennzeichnet,
characterized,
daß die Übertotpunktlage des Kniegelenks (2;3) durch den verlängerten Schenkel (2A) des Klinkenhebels (2) bestimmt wird, der sich am Anschlag (3B) des Klinkenhebelwiderlagers (3) abstützt.Latching device for an electrical switch according to claim 1, characterized in that
that the dead center position of the knee joint (2; 3) is determined by the extended leg (2A) of the ratchet lever (2), which is supported on the stop (3B) of the ratchet lever abutment (3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944824 | 1999-09-18 | ||
DE1999144824 DE19944824C1 (en) | 1999-09-18 | 1999-09-18 | Latch device for electric switch e.g. load protection switch has latch lever pivoted to switch lever and cooperating with pivot bearing provided by contact lever |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1085551A2 true EP1085551A2 (en) | 2001-03-21 |
EP1085551A3 EP1085551A3 (en) | 2003-01-02 |
EP1085551B1 EP1085551B1 (en) | 2004-02-11 |
Family
ID=7922511
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000119982 Expired - Lifetime EP1085551B1 (en) | 1999-09-18 | 2000-09-14 | Latching device for a switch |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1085551B1 (en) |
DE (1) | DE19944824C1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104517782A (en) * | 2014-11-28 | 2015-04-15 | 许继集团有限公司 | Rotary shaft limit device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4740770A (en) * | 1985-10-31 | 1988-04-26 | Merlin Gerin | Operating mechanism for a low voltage electrical circuit breaker |
DE4116454A1 (en) * | 1991-05-18 | 1992-11-19 | Licentia Gmbh | MECHANISM FOR A SELF-SWITCH |
DE19701470C1 (en) * | 1997-01-17 | 1998-01-02 | Geyer Ag | Latching arrangement for automatic electrical cut=out switch |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1563781C3 (en) * | 1966-12-08 | 1973-10-31 | Siemens Ag, 1000 Berlin U. 8000 Muenchen | Circuit breaker |
DE3517748C1 (en) * | 1985-05-17 | 1986-02-27 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Switching mechanism for a line protection circuit breaker |
DE19507605C1 (en) * | 1995-03-04 | 1996-08-22 | Abb Patent Gmbh | Snap-action latching mechanism for electrical switch |
-
1999
- 1999-09-18 DE DE1999144824 patent/DE19944824C1/en not_active Expired - Fee Related
-
2000
- 2000-09-14 EP EP20000119982 patent/EP1085551B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4740770A (en) * | 1985-10-31 | 1988-04-26 | Merlin Gerin | Operating mechanism for a low voltage electrical circuit breaker |
DE4116454A1 (en) * | 1991-05-18 | 1992-11-19 | Licentia Gmbh | MECHANISM FOR A SELF-SWITCH |
DE19701470C1 (en) * | 1997-01-17 | 1998-01-02 | Geyer Ag | Latching arrangement for automatic electrical cut=out switch |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104517782A (en) * | 2014-11-28 | 2015-04-15 | 许继集团有限公司 | Rotary shaft limit device |
Also Published As
Publication number | Publication date |
---|---|
EP1085551B1 (en) | 2004-02-11 |
EP1085551A3 (en) | 2003-01-02 |
DE19944824C1 (en) | 2001-02-01 |
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