EP2023366A2 - Schutzschalter - Google Patents

Schutzschalter Download PDF

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Publication number
EP2023366A2
EP2023366A2 EP07024632A EP07024632A EP2023366A2 EP 2023366 A2 EP2023366 A2 EP 2023366A2 EP 07024632 A EP07024632 A EP 07024632A EP 07024632 A EP07024632 A EP 07024632A EP 2023366 A2 EP2023366 A2 EP 2023366A2
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
handle arm
side plates
top plate
structural body
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
EP07024632A
Other languages
English (en)
French (fr)
Other versions
EP2023366A3 (de
EP2023366B1 (de
Inventor
Kazumasa Watanabe
Masahiro Fushimi
Masatoshi Murai
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2023366A2 publication Critical patent/EP2023366A2/de
Publication of EP2023366A3 publication Critical patent/EP2023366A3/de
Application granted granted Critical
Publication of EP2023366B1 publication Critical patent/EP2023366B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/521—Details concerning the lever handle
    • 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
    • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee

Definitions

  • This invention relates to a structure of a circuit breaker.
  • a handle arm that drives main springs has a U shape that covers the main springs from the side in order to ensure right-left balance, and the handle arm has an integral structure of a U-shaped metal plate in order to ensure rigidity (e.g., see JP-A No. 2006-196242 , FIG. 1 ).
  • a quick switch mechanism part of a circuit breaker is often a plate-shaped part whose rotational axis is parallel to the width direction of the circuit breaker, and those that are layered from the side have the best efficiency in terms of assembly, but because the handle arm that is often disposed on the outside has a U-shaped integral structure, layered assembly from the side has been impossible in conventional circuit breakers. Further, because the contact pressure of the contact point in circuit breakers differs per rated current, plural specifications whose loads differ are necessary for the main springs for driving, and plural width direction dimensions become necessary in correspondence to those plural specifications.
  • the present invention has been made in order to solve the aforementioned problem and provides a circuit breaker where assembly of the switch mechanism portion of the circuit breaker can be performed easily and which can easily accommodate various kinds of specifications.
  • a circuit breaker pertaining to this invention includes: a crossbar that holds a movable contact; a lower link that drives the crossbar; a lever that engages with a latch of an overcurrent trip device and rotates during tripping of the circuit breaker; an upper link that is supported on the lever and is joined together with the lower link via a spring pin to configure a toggle link together with the lower link; main springs whose driven sides are joined together with the spring pin; and a handle arm that joins together with driving sides of the main springs and is rotatably supported on a frame fixed to a casing of the circuit breaker.
  • the handle arm comprises a frame body whose cross section is substantially U-shaped and where one end of each of two side plates are joined together by a structural body. At least one of the side plates is a separate part fixedly attached to the structural body.
  • the side plate that is a separate part is fixedly attached to the structural body at three or more positions that do not line up in a straight line on this side plate.
  • the structural body of the handle arm may comprise one top plate and at least one pin.
  • the top plate may be formed integrally with one of the two side plates.
  • the structural body of the handle arm may comprise one top plate whose cross section is substantially L-shaped, and the three or more places where the top plate and the side plate are fixedly attached to each other may be dispersed on both portions of the L shape.
  • the structural body of the handle arm may comprise at least three pins that have the same shape.
  • the shapes of the two side plates of the handle arm excluding the handle arm of the circuit breaker where one of the side plates and the structural body are integrated may be the same.
  • circuit breaker pertaining to this invention assembly of the switch mechanism portion of the circuit breaker is easy, and the circuit breaker contributes to reducing the types of parts and the number of parts with respect to the demand of various specifications because of the standardization of the parts of the circuit breaker.
  • FIG. 1 to FIG. 8 show the entirety and part of the structure of a circuit breaker pertaining to embodiment 1 of this invention.
  • FIG. 1 is a sectional view of the entire circuit breaker in a tripped state.
  • FIG. 2 is a side sectional view of a switch mechanism portion of the circuit breaker in the tripped state.
  • FIG. 3 is a front view of essential parts of the switch mechanism portion in the tripped state (with main springs being shown schematically).
  • FIG. 4 is a side view of the switch mechanism portion in an OFF state.
  • FIG. 5 is a side sectional view of the switch mechanism portion in an ON state.
  • FIG. 6A is a front view showing a handle arm
  • FIG. 6B is a side view of the same handle arm
  • FIG. 6C is a plan view of the same handle arm.
  • FIG. 7A is an exploded front view of the handle arm
  • FIG. 7B is an exploded side view of the same handle arm
  • FIG. 7C is an exploded plan view of the same handle arm.
  • FIG. 8 is a diagram describing layered assembly of the switch mechanism portion using the handle arm.
  • the circuit breaker pertaining to this invention includes a casing 20 in which are housed the following: a movable contact 8 that includes a movable contact point 9 on one end; a fixed contact 10 that is brought into and out of contact with the movable contact point 9; a crossbar 7 that holds the movable contact 8; a lower link 6 that drives the crossbar 7; a lever 4 that is engaged with a latch 11 of an overcurrent trip device and rotates during tripping of the circuit breaker; an upper link 12 that is supported on the lever 4 and links to the lower link 6 via a spring pin 5 to configure a toggle link together with the lower link 6; main springs 2 whose driven sides are joined to the spring pin 5; a substantially U-shaped handle arm 3 that is joined to driving sides 2a of the main springs 2 and is rotatably supported on a frame fixed to the casing 20 of the circuit breaker; and a handle 1.
  • the switch mechanism comprises the handle 1 that projects from the casing 20, the handle arm 3 that is joined to the handle 1, a rotating shaft 3a of the handle arm 3, the main springs 2, the lever 4, the spring pin 5, the upper link 12, the lower link 6, the crossbar 7, and the latch 11.
  • the driving sides 2a of the main springs 2 move around the rotating shaft 3a of the handle arm 3.
  • the handle arm 3 of the circuit breaker pertaining to this invention is shown in FIGS. 6A, 6B and 6C and in exploded view in FIGS. 7A, 7B and 7C .
  • the handle arm 3 is formed in a substantial U-shape by two side plates 3b and 3c comprising metal plates and by a structural body that joins together one end (in the drawings, the upper portion) of each of these side plates 3b and 3c.
  • the structural body comprises a top plate 3d comprising one metal plate and a later-described pin 3e.
  • a tongue piece 3d1 for attachment to the handle 1 is disposed on the front and rear ends of the top plate 3d.
  • retainer portions 3d2 that retain the main springs 2 are disposed in the center portion of the top plate 3d.
  • projections 3d3 for joining the top plate 3d to the side plates 3b and 3c are disposed in two places each on each side (four places in total) of the top plate 3d.
  • the projections 3d3 are disposed in two places each on each side of the top plate 3d, but in terms of the relationship of assembly rigidity, the projections 3d3 may also be disposed in three places each or four places each on each side as long as they are disposed in two places each or more. Because the top plate 3d is one plate, it is manufactured by press working or punch working.
  • the two side plates 3b and 3c that are joined together with the top plate 3d comprise substantially rectangular metal plates, and concave portions 3b1 and 3c1 that are supported on the shaft 3a are respectively disposed in the lower portions of the side plates 3b and 3c.
  • Two projection-use holes 3b3 and 3c3 into which the projections 3d3 of the top plate 3d fit are respectively disposed in the upper portions of the side plates 3b and 3c.
  • pin-use holes 3b4 and 3c4 into which the distal ends of the pin 3e are inserted are respectively disposed in the vicinities of projecting portions of rear portions of the side plates 3b and 3c.
  • the pin 3e configures part of the structural body and comprises a metal rod that joins together the side plates 3b and 3c and simultaneously preserves the distance between the side plates 3b and 3c.
  • the projections 3d3 disposed in two places each on each side of the top plate 3d are inserted into the projection-use holes 3b3 and 3c3 in the two side plates 3b and 3c, and the distal ends of the pin 3e are inserted into the pin-use holes 3b4 and 3c4, whereby the side plates 3b and 3c are fixedly attached to the top plate 3d and the pin 3e at these portions.
  • the number of places where each of the side plates 3b and 3c is fixedly attached to the structural body is three: the two places of the projections 3d3 on each side of the top plate 3d and the one place of the pin 3e (six places in total on both sides of the handle arm 3).
  • the number of fixedly attached places is three or more, and the positions where the fixedly attached places are disposed are, from the standpoint of ensuring the rigidity of the handle arm 3, positions that do not line up in a straight line on the side plates.
  • FIGS. 7A to 7C These parts which configure the handle arm 3 are shown in the front view of FIG. 7A , the side view of FIG. 7B , and the plan view of FIG. 7C .
  • a method of fixedly attaching the places where the side places 3b and 3c, the top plate 3d and the pin 3e are joined together -- that is, the fixedly attached places -- when assembling the configural parts of the handle arm 3 shown in FIGS. 7A to 7C will now be described.
  • the projections 3d3 of the top plate 3d and the end portions of the pin 3e are inserted into the projection-use holes 3b3 and 3c3 and the pin-use holes 3b4 and 3c4 disposed in the side plates 3b and 3c, and thereafter fixed attachment is performed by caulking to crush in a caulking machine the portions sticking out from the side plates 3b and 3c.
  • Easy and strong fixed attachment is performed by a fixed attachment method resulting from caulking, but the fixed attachment method is not limited to this and may also be a method that welds or adheres the projections 3d3 of the top plate 3d and the end portions of the pin 3e to the side plates 3b and 3c.
  • FIG. 3 is a diagram showing a state where the inside parts are attached to the handle arm 3
  • FIG. 8 is a diagram showing part attachment and the process of assembling the handle arm 3 itself.
  • the assembly process shown in FIG. 8 is called layered assembly where the parts are sequentially superposed and assembled from one side. First, one side of each of the top plate 3d and the pin 3e is combined with the one side plate 3c. Next, one side frame 13 is placed on the side plate 3c while performing alignment.
  • FIG. 3 shows the assembly-completed handle arm 3 with the parts disposed therein.
  • each of the side plates 3b and 3c is fixedly attached at three points comprising the two points of the top plate 3d and the width direction positioning pin 3c, so a handle arm whose rigidity is high and which does not deform even when the large load of the main springs 2 acts on the center portion of the top plate 3d can be obtained.
  • handle arms corresponding to various widths can be configured simply by changing, in accordance with the specification of the circuit breaker, the width of the top plate and the length of the positioning pin that are the structural body. For this reason, the types of parts and the number of parts of the handle arm can be reduced.
  • FIG. 9A is a front view showing a handle arm of a circuit breaker pertaining to embodiment 2 of this invention
  • FIG. 9B is a side view of the same handle arm
  • FIG. 9C is a plan view of the same handle arm. Description of portions shared in common with those of embodiment 1 will be omitted.
  • the structural body that joins together the two side plates 3b and 3c is configured by one top plate 3g.
  • This top plate 3g is configured by one metal plate that is bent in a substantial L shape when seen from the side.
  • Projections 3g1 (two on each side, a total of four on both sides) are disposed on the sides of a horizontal portion that is one portion of the L shape, and projections 3g2 (one on each side, a total of two on both sides) are disposed on the other portion bent in the L shape. That is, the projections in the places where the top plate 3g and the side plates 3b and 3c are fixedly attached together are disposed so as to be dispersed on each portion of the L shape.
  • Projection-use holes 3b3 and 3c3 that correspond to the three projections 3g1 and 3g2 on each side of the top plate 3g are respectively disposed in the two side plates 3b and 3c to which the top plate 3b attaches.
  • the projections 3g1 and 3g2 of the top plate 3g are fitted into the corresponding projection-use holes 3b3 and 3c3 in the side plates 3b and 3c, whereby the top plate 3g and the side plates 3b and 3c are integrally assembled.
  • the projections 3g1 and 3g2 are caulked, whereby a substantially U-shaped handle arm is formed.
  • the top plate 3g and the side plates 3b and 3c are joined together at three fixedly attached places on each side.
  • the number of fixedly attached places is not limited to three on each side; it suffices as long as the number is three on each side. Similar to embodiment 1, the number of fixedly attached places is three or more, and the fixedly attached places are disposed in positions that do not line up in a straight line on the side plates.
  • handle arm By configuring the handle arm in this manner, there is the same action as in embodiment 1, and additionally the structural body that joins together the side plates suffices with one top plate, so the width direction positioning pin can be dispensed with, parts can be omitted, and the equipment for fixing can be simplified. Further, by using side plates having no concavo-convexities, either side plate can be used on both the right and left sides, and it is possible to further reduce the types of parts. Further, because one of the three fixedly attached places is separated from the top surface (horizontal surface), the effect that the positions in the width direction, or in other words the degree of parallelism between the side plates 3b and 3c, are easy to determine is obtained. Moreover, similar to embodiment 1, handle arms corresponding to various widths can be configured simply by changing, in accordance with the specification of the circuit breaker, the width dimension of the top plate.
  • FIG. 10A is a front view showing a handle arm of a circuit breaker pertaining to embodiment 3 of this invention
  • FIG. 10B is a side view of the same handle arm
  • FIG. 10C is a plan view of the same handle arm.
  • three pins 3e having the same shape are used as the structural body that joins together the two side plates 3b and 3c. That is, the sites corresponding to the top plate and the pin of the handle arm in embodiment 1 are configured by three pins having the same shape, whereby the same action as in embodiment 1 is preserved and the types of parts can be further reduced.
  • three pin-use holes 3b4 and 3c4 are respectively disposed in the upper portion of each of the two side plates 3b and 3c. Additionally, the side plates 3b and 3c are joined together by three pins 3e that have the same shape and each of whose two distal ends fits together with the pin-use holes 3b4 and 3c4. After the side plates 3b and 3c and the pins 3e have been combined, they are fixedly attached to each other by caulking the distal ends of the pins 3e that project from the side plates 3b and 3c.
  • the number of places where the pins 3e and the pin-use holes 3b4 and 3c4 are joined (i.e., fixedly attached) together is three or more, and the fixedly attached places are disposed in positions that do not line up in a straight line on the side plates.
  • a substantially U-shaped handle arm whose rigidity is high can be configured, the rigidity of both of the side plates is ensured by the three pins, and the positions of the side plates in the width direction are determined and maintained.
  • the main springs 2 are locked to the central pin of the three pins 3e. Because the pins 3e have the same shape, the same action as in embodiment 1 is preserved, and the types of parts can be further reduced. It will be noted that contact portions 3f for lever resetting that are bent inward are disposed as needed on the rear portions of the side plates 3b and 3c.
  • FIG. 11A is a front view showing a handle arm of a circuit breaker pertaining to embodiment 4 of this invention
  • FIG. 11B is a side view of the same handle arm
  • FIG. 11C is a plan view of the same handle arm.
  • a top plate 3cc and a pin 3e are used for the structural body that joins together the two side plates 3b and 3c, but the top plate 3cc extends over the top portion of the one side plate 3c and is bent in an L shape.
  • Two projections 3cc1 are disposed on the distal end of the top plate 3cc comprising the extension portion that is bent in an L shape, and projection-use holes 3b3 corresponding to these projections 3cc1 are disposed in the other side plate 3b.
  • the side plate 3b is fixedly attached to the top plate 3cc at these places and fixed by caulking.
  • the pin 3e configuring part of the structural body joins together the side plates 3b and 3c.
  • the method of joining together the side plates 3b and 3c and the pin 3e is the same as in embodiment 1, so detailed description thereof will be omitted here.
  • the number of fixedly attached places is three or more, and the fixedly attached places are dispersed so as to be disposed in the direction of a line interconnecting the power side and the load side of the circuit breaker. It will be noted that contact portions 3f for lever resetting that are bent inward are disposed as needed on the rear portions of the side plates 3b and 3c.
  • the handle arm By configuring the handle arm in this manner, the same action as in embodiment 1 is preserved, the number of parts can be reduced, and time and effort for assembling the circuit breaker can be saved because the top plate and one of the side plates are integrated. Further, the rigidity of the handle arm can be further raised because there are fewer fixedly attached places.

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EP20070024632 2007-08-09 2007-12-19 Schutzschalter Expired - Fee Related EP2023366B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007207998A JP4814848B2 (ja) 2007-08-09 2007-08-09 回路遮断器

Publications (3)

Publication Number Publication Date
EP2023366A2 true EP2023366A2 (de) 2009-02-11
EP2023366A3 EP2023366A3 (de) 2010-03-10
EP2023366B1 EP2023366B1 (de) 2011-03-09

Family

ID=39944464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070024632 Expired - Fee Related EP2023366B1 (de) 2007-08-09 2007-12-19 Schutzschalter

Country Status (4)

Country Link
EP (1) EP2023366B1 (de)
JP (1) JP4814848B2 (de)
CN (1) CN101364507B (de)
DE (1) DE602007013035D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5297270B2 (ja) * 2009-06-09 2013-09-25 三菱電機株式会社 回路遮断器
JP5304658B2 (ja) * 2010-01-07 2013-10-02 三菱電機株式会社 回路遮断器
CN104465247B (zh) * 2014-12-30 2016-05-11 上海电科电器科技有限公司 小型断路器的热式可调脱扣装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5931289A (en) * 1998-03-10 1999-08-03 Eaton Corporation Circuit breaker with quick closing mechanism
JP2000182502A (ja) * 1998-12-11 2000-06-30 Nitto Electric Works Ltd 配線用遮断器
JP2006196242A (ja) * 2005-01-12 2006-07-27 Fuji Electric Holdings Co Ltd 回路遮断器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682530B1 (fr) * 1991-10-15 1993-11-26 Merlin Gerin Gamme de disjoncteurs basse tension a boitier moule.
JP3250650B2 (ja) * 1996-07-09 2002-01-28 富士電機株式会社 回路遮断器
JP3425542B2 (ja) * 1999-09-08 2003-07-14 寺崎電気産業株式会社 回路遮断器のリセット装置
US6774749B2 (en) * 2001-09-19 2004-08-10 Square D Company Trip cross bar and trip armature assembly for a circuit breaker
JP4022524B2 (ja) * 2004-03-16 2007-12-19 三菱電機株式会社 回路遮断器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5931289A (en) * 1998-03-10 1999-08-03 Eaton Corporation Circuit breaker with quick closing mechanism
JP2000182502A (ja) * 1998-12-11 2000-06-30 Nitto Electric Works Ltd 配線用遮断器
JP2006196242A (ja) * 2005-01-12 2006-07-27 Fuji Electric Holdings Co Ltd 回路遮断器

Also Published As

Publication number Publication date
JP4814848B2 (ja) 2011-11-16
EP2023366A3 (de) 2010-03-10
CN101364507A (zh) 2009-02-11
EP2023366B1 (de) 2011-03-09
DE602007013035D1 (de) 2011-04-21
JP2009043605A (ja) 2009-02-26
CN101364507B (zh) 2011-05-04

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