EP0637831A1 - Dispositif de rupture des contacts pour appareils interrupteur de protection - Google Patents

Dispositif de rupture des contacts pour appareils interrupteur de protection Download PDF

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Publication number
EP0637831A1
EP0637831A1 EP94111300A EP94111300A EP0637831A1 EP 0637831 A1 EP0637831 A1 EP 0637831A1 EP 94111300 A EP94111300 A EP 94111300A EP 94111300 A EP94111300 A EP 94111300A EP 0637831 A1 EP0637831 A1 EP 0637831A1
Authority
EP
European Patent Office
Prior art keywords
contact
lever
switching
movement
force
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
EP94111300A
Other languages
German (de)
English (en)
Other versions
EP0637831B1 (fr
Inventor
Peter Flohr
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.)
Heinrich Kopp GmbH and Co KG
Original Assignee
Heinrich Kopp GmbH and Co KG
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 Heinrich Kopp GmbH and Co KG filed Critical Heinrich Kopp GmbH and Co KG
Publication of EP0637831A1 publication Critical patent/EP0637831A1/fr
Application granted granted Critical
Publication of EP0637831B1 publication Critical patent/EP0637831B1/fr
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
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/501Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • 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
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/52Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/526Manual 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
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S200/00Electricity: circuit makers and breakers
    • Y10S200/42Contact welding considerations
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/20Control lever and linkage systems
    • Y10T74/20558Variable output force
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/20Control lever and linkage systems
    • Y10T74/20576Elements
    • Y10T74/20582Levers
    • Y10T74/206Adjustable

Definitions

  • the invention relates to a device for tearing open an electrical contact pairing that tends to weld from a stationary contact and a contact that can be moved away from it, in particular in a protective switching device.
  • a noble homogeneous material preferably silver
  • this material tends to undesirably contact weld.
  • heterogeneous materials for. B. sintered contacts used, the z. B. lose the tendency to sweat with the carbon component.
  • the invention has for its object to provide a device of the type mentioned, which allows the use of noble homogeneous materials for the contact pairing despite the risk of contact welding.
  • the device according to the invention for tearing open an electrical contact pair that tends to weld from a stationary contact and a contact that can be moved away from it in particular in a protective switching device, advantageously has a switching lever for the movable contact that is biased in the contact opening direction and can be pivoted from a ready position, and a device by which the Shift lever is stable in the ready position, a pivot point shift is provided for the movement of the shift lever from the ready position, by means of which an increased tearing force can be exerted on the movable contact.
  • An initially high tearing force with subsequent lower opening force can preferably be exerted on the movable contact by the shifting of the pivot point during the shift lever movement.
  • This shifting of the fulcrum can be realized by various kinematic solutions, among others also by corresponding control profiles.
  • the shift lever which preferably has a first leg for the attack of the holding device and a second leg for the attack on the movable contact, is rotatably mounted between its two legs and pivotable on the second leg, an extraordinarily compact, functional and technically simple kinematics is created , in which the desired combination of tear force and contact opening path can be realized in a simple manner.
  • the direction of displacement of the rotary thrust joint is preferably oriented such that the shift lever can then be pivoted about its contact point in a first section of its movement from the ready position with a large lever ratio in a second movement section in the rotary slide joint either additionally, that is to say with superimposition of the rotary movement, or without overlaying a rotary movement, and in a third movement section with a comparatively lower lever ratio, can be pivoted about the rotary slide joint.
  • a shift lever is thus advantageously used, which is biased in a switched-on state, that is to say in the ready position, between a fixed contact point, which is formed, for example, in a switchgear housing, and a holding device, which is preferably designed with a pawl, by a switching spring in the contact tear-open direction .
  • the shift lever After unlatching, the shift lever first rotates under the action of the shift spring around its contact point, in particular its housing stop, in the contact tearing direction.
  • the force of the switching spring is advantageously translated by the lever ratio on the switching lever that the tearing force on the movable contact is considerably greater than if the rotation from the beginning around the fixed bearing journal, for example in the housing, would take place.
  • the switching lever continues to rotate due to the switching spring force acting on it until its slot guide strikes the fixed bearing journal of the housing.
  • the pivot point is shifted in such a way that the force on the movable contact decreases in the now changed lever ratio. This also contributes to the fact that the resulting force, which acts on the movable contact, decreases due to the changing action conditions due to the lever pivoting.
  • the movable contact is then brought into the required end position of the position, with no great power requirement being required during this third movement section.
  • the position of the contact point and that of the rotary thrust joint at the shift lever are selected such that the line of action of the force directed at the movable contact coincides with the direction of movement of the contact when opening and then force-reducing by the pivoting movement of the shift lever diverges.
  • the rotary thrust joint is preferably formed with a fixed or housing-fixed bearing journal which is guided in an elongated hole.
  • the switching spring provided for pretensioning the shift lever is preferably articulated on the first leg, the line of action of the shift spring force being selected such that the length of the resulting lever arm for the pivoting movement of the shift lever in the third movement section is reduced compared to that in the first movement section.
  • the above-mentioned holding device is formed in a particularly simple manner with a detachable latch lock, which includes a latch lever when used in switching devices.
  • the possibility according to the invention of effective and reliable mechanical breaking of possibly glued contacts advantageously avoids the use of heterogeneous contact pads, for example sintered contacts.
  • the design according to the invention avoids additional design and manufacturing expenditure and enables the contact material to be selected on the basis of purely electrical and commercial criteria.
  • FIG. 1 and 2 show a device 10 for tearing an electrical contact pairing, which tends to weld, from a stationary contact 11 and a contact 12 which can be moved away therefrom, which is intended for use in a protective switching device.
  • the movable contact 12 is arch-like and articulated at 13 on its opposite end fixed to the housing.
  • the contact closing force is applied via an articulated member 14 that is supported on the housing via a pressure spring 15 at its other end.
  • corresponding contact coatings have not been shown.
  • the arched movable contact 12 includes a vertically upwardly extending loading section 16, which is provided for engagement by a switching lever 17.
  • the switching lever 17 has a first leg 18 for the attack of a holding device 19 and a second leg 20 for the attack on the movable contact 12 in the application area 16. Between its two legs 18 and 20, the shift lever 17 is rotatably mounted by means of a rotary sliding joint 21.
  • the rotary push joint 21 consists of a fixed bearing journal 22 which is guided in an elongated hole 23.
  • a contact point 24 is formed at the intersection of mutually angled contact surfaces 25 and 26 at a distance from the rotary thrust joint, about which the shift lever 17 pivots in an initial first movement section.
  • the contact point 24 is supported on a flat housing surface 27, which also functions as a stop for the pivoted contact surface 26, see FIG. 2.
  • a pawl 28 is formed on the first leg 18 of the shift lever 17 and, together with a ratchet lever 29, shows a configuration of the holding device 19 as a ratchet lock.
  • the pawl lever 29 is also pivotally mounted on the housing and can be brought from the latched state after pivoting into the dashed state by applying a force K to its other lever end.
  • a switching spring 30 is articulated to the first leg 18 at a distance from the rotary and sliding joint 21 and is fastened to the housing at its other end.
  • Fig. 1 the lever ratios are shown, which result on the switching lever 17 in its ready position due to the action of the switching spring 30 and the support of the switching lever 17 by means of its contact point 24 on the flat housing wall 27 with respect to a tear force F for the movable contact 17 .
  • Fig. 3 shows clearly the course of the tear force F over the contact opening path S. Accordingly, in the first movement section, in which a high tear force F is required, the force achievable by the device is extremely high, then falls in an extremely short second movement section as a result of the Shifting of the shift lever 17 in the rotary push joint 21 in steps to a considerably lower value F ', which then increases again slightly due to the engagement conditions between the second leg 20 and the loading section 16.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Push-Button Switches (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Scissors And Nippers (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Contacts (AREA)
  • Motor Or Generator Frames (AREA)
EP94111300A 1993-08-03 1994-07-20 Dispositif de rupture des contacts pour appareils interrupteur de protection Expired - Lifetime EP0637831B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4326067A DE4326067A1 (de) 1993-08-03 1993-08-03 Kontaktaufreißeinrichtung für Schutzschaltgeräte
DE4326067 1993-08-03

Publications (2)

Publication Number Publication Date
EP0637831A1 true EP0637831A1 (fr) 1995-02-08
EP0637831B1 EP0637831B1 (fr) 1998-05-13

Family

ID=6494374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111300A Expired - Lifetime EP0637831B1 (fr) 1993-08-03 1994-07-20 Dispositif de rupture des contacts pour appareils interrupteur de protection

Country Status (9)

Country Link
US (1) US5502285A (fr)
EP (1) EP0637831B1 (fr)
AT (1) ATE166181T1 (fr)
AU (1) AU670881B2 (fr)
DE (3) DE4326067A1 (fr)
ES (1) ES2117740T3 (fr)
HK (1) HK1007460A1 (fr)
SG (1) SG44552A1 (fr)
TR (1) TR27888A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19542690A1 (de) * 1995-11-16 1997-05-22 Aeg Niederspannungstech Gmbh Vorrichtung zum zwangsweisen Trennen von Netzleitungen bei Schaltgeräten
US6714108B1 (en) 2003-04-02 2004-03-30 Eaton Corporation Circuit breaker including mechanism for breaking tack weld

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140269B (de) * 1961-02-04 1962-11-29 Continental Elektro Ind Ag Leistungsselbstschalter
DE2015624A1 (de) * 1970-04-02 1971-10-21 Bbc Brown Boveri & Cie Selbstschalter
DE3119910A1 (de) * 1980-05-28 1982-04-08 Weber AG Fabrik elektrotechnischer Artikel und Apparate, 6020 Emmenbrücke Kontaktvorrichtung fuer einen schalter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049956B (fr) * 1956-03-27
DE1140630B (de) * 1962-03-01 1962-12-06 Stotz Kontakt Gmbh Installationsselbstschalter
DE1640996A1 (de) * 1967-12-23 1970-12-10 Licentia Gmbh Schaltmechanismus fuer elektrische Schaltgeraete
US3953697A (en) * 1973-11-28 1976-04-27 Teichert Allen L Dual fulcrum switch
US4061895A (en) * 1976-01-21 1977-12-06 Cutler-Hammer, Inc. Higher rated double-pole trigger switch
DE4304772C1 (de) * 1993-02-17 1994-05-19 Kloeckner Moeller Gmbh Schaltvorrichtung für Leistungsschaltgeräte

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140269B (de) * 1961-02-04 1962-11-29 Continental Elektro Ind Ag Leistungsselbstschalter
DE2015624A1 (de) * 1970-04-02 1971-10-21 Bbc Brown Boveri & Cie Selbstschalter
DE3119910A1 (de) * 1980-05-28 1982-04-08 Weber AG Fabrik elektrotechnischer Artikel und Apparate, 6020 Emmenbrücke Kontaktvorrichtung fuer einen schalter

Also Published As

Publication number Publication date
ATE166181T1 (de) 1998-05-15
AU6876694A (en) 1995-02-16
AU670881B2 (en) 1996-08-01
ES2117740T3 (es) 1998-08-16
DE4326067A1 (de) 1995-02-09
TR27888A (tr) 1995-10-11
SG44552A1 (en) 1997-12-19
DE9321552U1 (de) 1999-09-02
EP0637831B1 (fr) 1998-05-13
US5502285A (en) 1996-03-26
HK1007460A1 (en) 1999-04-09
DE59405942D1 (de) 1998-06-18

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