EP0358286B1 - Ensemble conducteur articulé pour un levier de contact - Google Patents

Ensemble conducteur articulé pour un levier de contact Download PDF

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Publication number
EP0358286B1
EP0358286B1 EP89250026A EP89250026A EP0358286B1 EP 0358286 B1 EP0358286 B1 EP 0358286B1 EP 89250026 A EP89250026 A EP 89250026A EP 89250026 A EP89250026 A EP 89250026A EP 0358286 B1 EP0358286 B1 EP 0358286B1
Authority
EP
European Patent Office
Prior art keywords
contact
lever
connecting bar
stationary
assembly according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89250026A
Other languages
German (de)
English (en)
Other versions
EP0358286A3 (fr
EP0358286A2 (fr
Inventor
Clifford A. Buxton
Neil A. Mccord
David A. Leone
James A. Tharp
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0358286A2 publication Critical patent/EP0358286A2/fr
Publication of EP0358286A3 publication Critical patent/EP0358286A3/fr
Application granted granted Critical
Publication of EP0358286B1 publication Critical patent/EP0358286B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal
    • H01H2001/5838—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal using electrodynamic forces for enhancing the contact pressure between the sliding surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H9/383—Arcing contact pivots relative to the movable contact assembly

Definitions

  • the invention relates to a current-transmitting joint arrangement consisting of a stationary connecting rail with a pivotable contact lever, wherein a joint part of the pivotable contact lever penetrated by a pivot axis is overlapped by two sections of the stationary connecting rail.
  • a joint arrangement of this type is known, for example, from US-A-4 635 012. Further examples of current-transmitting joint arrangements can be found in the following US-A-: 4 137 437, 4 166 205, 4 219 713, 4 264 796, 4 291 209, 4 635 012 and 4 524 339.
  • US-A-4 635 012 describes the articulation arrangement of a circuit breaker, in which a connecting bar is forked by a longitudinal slot into two arms, which at their ends support arcuate receiving surfaces for a circular articulation area at the end of a pivotable contact lever.
  • US-A-4 524 339 describes a blade contact assembly for a circuit breaker with a spring wound around each circular bearing location to provide a number of electrical contact locations between each of the contact blades and the bearing.
  • Hinge assemblies of the type under consideration are applied to two relatively movable, high current carrying parts without a connection to be able to use by a flexible current band. Therefore, the main problem of the tapeless joint connections is the electrical resistance that is present in the gap between the cooperating parts of the joint arrangement. This resistance causes current-dependent heating, which can limit the usability of the joint arrangement. Proceeding from this, the invention has for its object to provide a current-transmitting joint arrangement of the type mentioned, which is characterized by low electrical contact resistance, low manufacturing costs and great reliability.
  • the sections of the fixed connecting rail bear against the articulated area of the pivotable contact lever to form at least three discrete contact areas with flat contact surfaces, one of the sections of the fixed connecting rail at least two planar contact surfaces standing at an angle to one another and the other the sections have at least one flat contact surface.
  • both parts of the fixed connecting rail are designed to be resilient in themselves, the spatial position of the pivot axis of the pivotable contact lever may not be sufficiently determined depending on the given cross section of the parts. This can be avoided in that the sections of the fixed connecting rail are designed with different cross sections, such that one section is designed to be more flexible than the other section in relation to the articulated area of the pivotable contact lever.
  • the articulated area of the pivotable contact lever can have an arcuate contour in the manner known per se.
  • the contact lever is free of a torque caused by the joint arrangement.
  • the effect of parallel current paths in the region of the fixed connecting rail can be used to increase the contact force within the joint arrangement. If this is not sufficient, a spring and a spring force can be placed between a crossbar coupled to the movable contact lever and a section of the connecting rail located on the same side of the contact lever as the crossbar, and the spring force on the section in the sense of an increase in the contact force between the Section and the contact lever transmitting pressure lever can be arranged. This ensures that the pressing force is increased when the contact lever is pivoted into its switched-on position.
  • the pressure lever can expediently be designed as an angle lever and can be arranged in the region of its angling against a stationary bearing pin under the influence of the spring.
  • one section of the connecting rail can be designed as a contact bridge and can be provided with an elongated hole extending transversely to its longitudinal direction for receiving a stationary guide pin which also serves as a bearing pin of the pressure lever.
  • the current-dependent and position-dependent increase in the pressing force can be selected in a wider range because the contact bridge is free of restoring forces due to its articulated support on the other section of the fixed connecting rail.
  • FIG. 1 shows a side view of a live articulated connection.
  • FIG. 2 shows a top view of the current-carrying joint connection according to FIG. 1.
  • Figures 3, 4, 5, 6 and 7 show further embodiments of a current-carrying articulation in each case in a side view corresponding to Figure 1.
  • FIG. 1 shows the main current path of a circuit breaker, in particular a compact low-voltage circuit breaker with an insulating housing.
  • a contact lever 18 is used to open and close switching contacts 10 and 12 a pivot axis 22 is movable.
  • the contact lever 18 is connected to a stationary connecting rail 16 by means of a current-carrying joint arrangement designated as a whole by 14.
  • the joint arrangement 14 comprises a joint region 20 which surrounds the pivot axis 22 and which has a circular contour.
  • a fixed part 24 of the joint arrangement 14 interacts with the joint region 20, which is formed from a contacting end part 36 of an upper section 26 of the connecting rail 16 and a further contacting end part 34 of a lower section 28 of the fixed connecting rail 16.
  • the contacting end part 36 of the section 26 is divided into contact fingers 30, which cooperate with the joint regions 20 of a corresponding number of contact levers 18.
  • the end part 36 of the section 26 has a flat contact surface 32, while the end part 34 of the section 28 has two flat contact surfaces 38 which are at an angle to one another. This creates three discrete contact areas 40 between the articulated area 20 of the contact lever 18 and the end parts 34 and 36.
  • the lower section 28 of the connecting bar 16 is designed with a larger cross section, ie a greater thickness, than the upper section 26.
  • the resulting greater strength of the lower section 28 causes the pivot axis 22 to be maintained in the position shown when the contact lever 18 is loaded.
  • the end part 36 of the upper section 26 is offset by an offset relative to the plane of the lower section 28 in such a way that an intermediate space is created and thus the end part 36 is resiliently movable relative to the end part 34.
  • This arrangement enables an increase in the contact force between the flat contact surfaces 32 and 38 under the influence of the current flowing over the current path.
  • the increase in contact force is due to the interaction of the partial currents indicated in the current paths A and B in FIG. 1 and the magnetic fields associated therewith.
  • the sections 26 and 28 of the connecting bar 16 are of the same thickness.
  • relatively movable end parts 42 and 44 are formed, each of which rests on the articulated area 20 of the contact lever 18 with three planar contact surfaces 32 which are at an angle to one another, forming three discrete contact areas 40.
  • the sections 26 and 28 of the connecting bar 16 are bent off symmetrically, similar to the example according to FIG. 3, with end parts 46 and contacting ends 48 which can be moved relative to one another.
  • the ends 48 have two flat contact surfaces 50 which are approximately at right angles to one another and which bear against the joint region 20 with a circular contour in the manner already described.
  • the contact force between the parts of the joint arrangement 14 does not have any effect on the position of the contact lever 18, in the example according to FIG. 5 such a design is chosen that the contact force exerts a torque acting in the closing direction of the contact lever 61.
  • the joint area 62 of the contact lever 61 surrounding the pivot axis 66 is designed such that flattened sides 64 are present on both sides of the contact areas 40.
  • the radius of the joint area 62 with respect to the pivot axis 66 thus decreases on both sides of the contact areas 40. In this way, a torque acts on the contact lever 61 when it is rotated starting from the position shown in the switch-on direction and thereby moves the contact areas 40 out of the neutral position shown with respect to the pivot axis 60 become.
  • the fixed part of the hinge arrangement is adapted to the hinge area 62 of the contact lever 61 in a special way.
  • an upper end part 56 of a section 52 of the fixed connecting rail 16 is formed with a flat contact surface 60.
  • the end part 56 is movable by an offset in the contact area 40 relative to a lower end part 58 of a lower section 54 of the connecting bar 16.
  • the end part 58 has two flat contact surfaces 60 on two legs that are perpendicular to one another.
  • the voltage of the tension spring 80 suspended on a crossbar 82 connecting the contact lever 18 depends on the position of the contact lever 18 relative to the fixed switching contact 12 in such a way that the voltage is greatest when switched on, ie when the switching contacts 10 and 12 are touched . In this way, the pressure force in the contact areas 40 is greatest in the switched-on position of the contact lever 18.
  • the pressure lever 76 can also be designed to be resilient, for example as a leaf spring.
  • one part of the fixed connecting rail 16 is designed as a contact bridge 72 which forms a contact area 92 on the lower end part 74 with a crowned end. This in turn creates the parallel current paths A and B, but the forces resulting from the current can be fully effective.
  • the contact bridge 72 is secured against displacement in the longitudinal direction of the connecting rail 16 by a fixed bearing pin 86 which is received in an elongated hole 88 of the contact bridge 72.
  • the bearing pin 86 also serves as a pivot bearing for a likewise angled pressure lever 84 which, in the manner already described with reference to FIG. 6, is under the action of a tension spring 80.
  • the pressure lever 84 acts with a nose on the contact bridge 72 in the area of its flat contact surface 90 and thus close to the contact area 40.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (8)

  1. Dispositif d'articulation à transmission de courant, constituée par un rail fixe de raccordement (16) comportant au moins un levier de contact pivotant (18), et dans lequel deux éléments (26,28; 52, 54; 72, 74) du rail fixe de raccordement (16) s'engagent par-dessus une partie d'articulation (20,62), qui est traversée par un axe de basculement (22,66), du levier de contact basculant (18), caractérisé par le fait que les éléments (26,28) du rail fixe de raccordement (16) s'appliquent contre la partie d'articulation (20,66) du levier de contact basculant (18) en formant au moins trois zones de contact discrètes (40) possédant des surfaces de contact planes (32,58,60,90), l'un (26) des éléments (26,28) du rail fixe de raccordement (16) possédant au moins deux surfaces planes de contact (38), qui font un angle entre elles, et l'autre (26) des éléments (26,28) possède au moins une surface de contact plane (32).
  2. Dispositif d'articulation suivant la revendication 1, caractérisé par le fait que les éléments (26,28; 52,54) du rail fixe de raccordement (16) sont disposés l'un contre l'autre et comportent deux parties d'extrémité (34,36; 42,44; 56,58; 68,70) qui sont déplaçables l'une par rapport à l'autre à l'aide d'au moins une partie coudée et comportent des voies parallèles de courant (A,B) pourvues des surfaces planes de contact (32,38;50;60;90).
  3. Dispositif d'articulation suivant la revendication 1 ou 2, caractérisé par le fait que les éléments (26,28) du rail fixe de raccordement (16) sont réalisés avec des sections transversales différentes de sorte qu'un élément (26) est plus flexible que l'autre élément (28) par rapport à la partie d'articulation (20) du bras de contact basculant (18).
  4. Dispositif d'articulation suivant l'une des revendications précédentes, caractérisé par le fait que la partie d'articulation (20) du levier de contact basculant (18) possède un contour circulaire.
  5. Dispositif d'articulation suivant l'une des revendications 1 à 3, caractérisé par le fait que la partie d'articulation (62) du levier de contact basculant (18) comporte, respectivement des deux côtés des points de contact (40) formés avec les éléments (52,54) du rail fixe de raccordement (16), des zones possédant un rayon qui diminue par rapport à l'axe de basculement (66).
  6. Dispositif d'articulation suivant l'une des revendications 1 à 4, caractérisé par le fait qu'entre une traverse (82), accouplée au levier de contact mobile (18), et un élément (68,72), situé du même côté du dispositif d'articulation que la traverse (82), par rapport au levier de contact, du rail fixe de raccordement (16) sont disposés un ressort (80) et un levier de serrage (76,84), qui transmet la force du ressort à l'élément (68,72) dans le sens d'un accroissement de la force de contact entre les éléments (68,70; 72,74) du rail fixe de raccordement (16) et de la zone d'articulation (20) du levier de contact (18).
  7. Dispositif d'articulation suivant la revendication 6, caractérisé par le fait que le levier de serrage (76) est réalisé sous la forme d'un levier coudé et s'applique contre un tourillon fixe, dans la zone de sa partie coudée, sous l'influence du ressort (80).
  8. Dispositif d'articulation suivant la revendication 6, caractérisé par le fait qu'un élément (72) du rail de raccordement (16) est réalisé sous la forme d'un étrier de contact (72) et comporte un trou allongé (88), qui s'étend transversalement par rapport à la direction longitudinale et loge un axe fixe de guidage (86), qui sert simultanément de tourillon pour le support du levier de serrage (84), de manière qu'il puisse basculer.
EP89250026A 1988-09-08 1989-09-07 Ensemble conducteur articulé pour un levier de contact Expired - Lifetime EP0358286B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/242,233 US4926019A (en) 1988-09-08 1988-09-08 Moving copper pivot
US242233 1988-09-08

Publications (3)

Publication Number Publication Date
EP0358286A2 EP0358286A2 (fr) 1990-03-14
EP0358286A3 EP0358286A3 (fr) 1991-01-02
EP0358286B1 true EP0358286B1 (fr) 1995-03-01

Family

ID=22913978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89250026A Expired - Lifetime EP0358286B1 (fr) 1988-09-08 1989-09-07 Ensemble conducteur articulé pour un levier de contact

Country Status (6)

Country Link
US (1) US4926019A (fr)
EP (1) EP0358286B1 (fr)
JP (1) JPH02117024A (fr)
CA (1) CA1334595C (fr)
DE (1) DE58909052D1 (fr)
ES (1) ES2069577T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416104C2 (de) * 1994-04-19 2000-07-13 Siemens Ag Schaltkontaktanordnung eines elektrischen Leistungsschalters
DE19635366A1 (de) * 1996-08-21 1998-02-26 Siemens Ag Bewegbare Kontaktanordnung für einen Niederspannungs-Leistungsschalter mit einem Schwenklager
US6005206A (en) * 1998-05-07 1999-12-21 Eaton Corporation Electrical switching apparatus with improved contact arm carrier arrangement
FR2822588B1 (fr) * 2001-03-23 2003-07-04 Schneider Electric Ind Sa Dispositif assurant le passage d'un courant electrique entre des bras conducteurs articules
WO2005073994A1 (fr) * 2004-01-28 2005-08-11 Mitsubishi Denki Kabushiki Kaisha Rupteur
FR2931583A1 (fr) * 2008-05-22 2009-11-27 Schneider Electric Ind Sas Dispositif de contact pour contacteur de forte puissance resistive

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554427A (en) * 1983-12-19 1985-11-19 Westinghouse Electric Corp. Molded case circuit breaker with movable lower electrical contact

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US3158720A (en) * 1961-02-17 1964-11-24 Fed Pacific Electric Co Contact assembly having hinge means utilizing electrodynamic forces of current flow therethrough
US3215803A (en) * 1962-12-31 1965-11-02 Allis Chalmers Mfg Co Contact structure for circuit breaker
US3271533A (en) * 1963-10-28 1966-09-06 Kinetics Corp Rotary switch, with vibration resistant resilient displaceable fixed contact structure
DE1218593B (de) * 1963-11-27 1966-06-08 Walter Holzer Flachkontaktstueck
US3402274A (en) * 1965-10-01 1968-09-17 Square D Co Contact structure for a power circuit breaker
US3365561A (en) * 1966-11-21 1968-01-23 Gen Electric Multiple finger type current-carrying contact arm pivot assembly
GB1312156A (en) * 1970-10-29 1973-04-04 Dorman Smith Switchgear Ltd Electrical circuit breakers and isolators
US4166205A (en) * 1976-12-30 1979-08-28 Westinghouse Electric Corp. Stored energy circuit breaker
US4264796A (en) * 1976-12-30 1981-04-28 Westinghouse Electric Corp. Circuit breaker having improved movable contact
US4219713A (en) * 1976-12-30 1980-08-26 Westinghouse Electric Corp. Circuit breaker with high speed trip latch
US4137437A (en) * 1977-06-03 1979-01-30 Westinghouse Electric Corp. Circuit breaker having improved movable crossbar and spring holder
US4291209A (en) * 1977-06-21 1981-09-22 Westinghouse Electric Corp. Circuit breaker having improved movable contact-drive mechanism interconnection
CH631027A5 (de) * 1978-06-30 1982-07-15 Bbc Brown Boveri & Cie Elektrische gleichstromkontaktvorrichtung.
US4245203A (en) * 1978-10-16 1981-01-13 Westinghouse Electric Corp. Circuit interrupter with pivoting contact arm having a clinch-type contact
US4484164A (en) * 1983-03-28 1984-11-20 Siemens-Allis, Inc. Braidless movable contact with wiping action
US4524339A (en) * 1983-05-09 1985-06-18 Square D Company Contact control arrangement for high amperage molded case circuit breaker
US4598186A (en) * 1983-05-09 1986-07-01 Square D Company Vent arrangement for high amperage molded case circuit breaker
JPS6147035A (ja) * 1984-08-10 1986-03-07 富士電機株式会社 回路遮断器の接触子構造
US4713504A (en) * 1986-03-03 1987-12-15 Westinghouse Electric Corp. Circuit breaker with hinged arcing contact

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554427A (en) * 1983-12-19 1985-11-19 Westinghouse Electric Corp. Molded case circuit breaker with movable lower electrical contact

Also Published As

Publication number Publication date
US4926019A (en) 1990-05-15
DE58909052D1 (de) 1995-04-06
ES2069577T3 (es) 1995-05-16
EP0358286A3 (fr) 1991-01-02
EP0358286A2 (fr) 1990-03-14
CA1334595C (fr) 1995-02-28
JPH02117024A (ja) 1990-05-01

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