EP0263331B1 - Überstromschutzschalter - Google Patents

Überstromschutzschalter Download PDF

Info

Publication number
EP0263331B1
EP0263331B1 EP87113455A EP87113455A EP0263331B1 EP 0263331 B1 EP0263331 B1 EP 0263331B1 EP 87113455 A EP87113455 A EP 87113455A EP 87113455 A EP87113455 A EP 87113455A EP 0263331 B1 EP0263331 B1 EP 0263331B1
Authority
EP
European Patent Office
Prior art keywords
lever
locking
circuit breaker
tripping
protective circuit
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
EP87113455A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0263331A1 (de
Inventor
Fritz Krasser
Erhard Pietsch
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.)
Ellenberger and Poensgen GmbH
Original Assignee
Ellenberger and Poensgen GmbH
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 Ellenberger and Poensgen GmbH filed Critical Ellenberger and Poensgen GmbH
Priority to AT87113455T priority Critical patent/ATE68909T1/de
Publication of EP0263331A1 publication Critical patent/EP0263331A1/de
Application granted granted Critical
Publication of EP0263331B1 publication Critical patent/EP0263331B1/de
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
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/30—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide
    • H01H73/306—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide the push-button supporting pivotally a combined contact-latch lever
    • 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
    • H01H2071/508—Latching devices between operating and release mechanism with serial latches, e.g. primary latch latched by secondary latch for requiring a smaller trip force
    • 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

Definitions

  • the invention relates to an overcurrent protection switch with the features specified in the preamble of claim 1.
  • the spring mechanism or switch lock of an overcurrent protection switch essentially has a movable contact piece which closes the switching path of the switch due to its contact with one or more fixed contacts.
  • the movable contact piece is spring-loaded in the switch-off direction, either directly or via articulated switching lock parts.
  • the contact piece In its switched-off position, the contact piece is locked directly or by means of components of the switch lock which are connected to it in an articulated manner - here the so-called trigger slide - by means of a locking lever. This can be pivoted into its locking position and can be pivoted into its unlocking position against a restoring force by a thermal and / or electromagnetic release element or by the actuating handle of the switch.
  • the movable contact piece is fixed in its switched-on position by supporting the trigger slide articulated to the movable contact piece on a stop surface of the end of the locking lever which projects into the defined movement path of the trigger slide in its locking position.
  • the path of movement of the trigger slide can or the like by guiding it in a housing groove. are caused.
  • a link chain-like coupling is also conceivable of the trigger slide, with which a design-related on-off movement of the movable contact piece can be transmitted to the trigger slide. It is only important that the latter cover a path and direction defined when the switch is turned on and off.
  • the overcurrent release elements of the spring mechanism for pivoting the locking lever into its unlocking position must apply release forces.
  • counter forces are composed, among other things, of frictional forces acting on the locking point and on the locking lever, resulting from its spring action in the locking direction.
  • these counter-forces and thus the triggering forces to be applied by the overcurrent releases are to be kept as small as possible.
  • toggle lever systems are structurally complex with a correspondingly high amount of components and assembly work for the jumping mechanism.
  • the object of the invention is to provide an overcurrent protection switch with a locking device for its spring mechanism, in which the triggering forces to be applied by the triggering elements are kept particularly small with simple constructional means.
  • the total force acting on the locking point is reduced by breaking it down into two sub-components.
  • the trigger slide lies with its end pointing in the direction of switch-off against the stop surface of the locking lever and also against a counter-bevel fixed to the housing in its movement path.
  • the stop surface of the locking lever and the counter bevels form a wedge-shaped inner angle region that opens against the direction in which the trigger slide is switched off.
  • the total force is thus broken down in the manner of a parallelogram of forces and acts partly on the counter bevels and only a fraction of the actual locking point between the trigger slide and the locking lever.
  • the locking point is therefore loaded with a lower force, which significantly reduces the friction and leverage forces.
  • the subclaims 2 to 6 relate to advantageous developments of the locking device according to the invention.
  • the housing-fixed bevels are arranged at a larger angle to the switch-off direction than the stop surface of the locking lever.
  • the force decomposition in subcomponents is shifted onto the stop surface in favor of less force application. If this measure is combined in particular with an embodiment of the subject matter of the invention, particularly favorable force relationships result in the locking device.
  • the counter-bevels fixed to the housing and the stop surface of the locking lever form an obtuse inner angle range of approximately 90 ° - for example between 75 ° and 105 ° - and at the same time the counter-bevels are arranged at a larger angle, for example at an angle four times larger than the stop surface to the switch-off direction , a high proportion of the opening forces are supported via the housing bevels. The remaining force component acting on the locking point is thus further reduced. However, due to the geometry, this is still so high that after the locking lever is pivoted into its unlocked position, the trigger slide can slide under the influence of this subcomponent on the counter slope and can be transferred to the switch-off position of the spring mechanism with the contact piece.
  • an advantageous shape for the support end of the trigger slide is specified.
  • it By designing it as an axle journal guided in a slot-like housing groove, a double function is achieved.
  • the release slide is guided along a defined movement path, and secondly, the pin shape results in two point-shaped or at least linear contact areas of the release slide on the counter slope or the stop surface of the locking lever.
  • the points of application of the sub-components of the breaking force are thus clearly defined and there are defined force ratios that can be reproduced from switching cycle to switching cycle.
  • a housing groove is a structurally simple measure to achieve the guidance of a movable component along a certain path.
  • an advantageous embodiment of the housing groove is specified.
  • the counter-bevel fixed to the housing is accordingly formed in a simple manner by an inclined offset of the housing groove which is arranged in the overlap region with the locking lever end and is directed away therefrom.
  • the oblique offset itself can pass as a flat surface at an obtuse angle into the rectilinear regions of the housing groove which adjoin on both sides, but it is also a flat, S-shaped curve is conceivable.
  • Claim 6 teaches a measure with which additional lever forces to be overcome by the triggering forces of the triggering elements are avoided when the locking lever is pivoted into its unlocked position.
  • Its stop surface is namely designed as a convex cylinder segment surface, the radius of which essentially corresponds to the distance of the stop surface from the pivot point of the locking lever.
  • the further claims 7 to 15 relate to advantageous refinements of the subject matter of the invention for a push-button-operated overcurrent protection switch.
  • This is essentially a further development of the push-button-operated overcurrent protection switch with thermal tripping in accordance with DE-C-25 02 579.
  • the known overcurrent protection switch is provided with a momentary on, off, thermal as well as a free release. It has a contact arm carrier designed as a two-armed angle lever, which can be pivoted and displaced in the switching plane, which has a guide arm which is arranged essentially at right angles to the direction of actuation of the push button and is spring-loaded against this direction, and a support arm which is arranged essentially parallel to this direction to the side of the push button.
  • the contact bridge for contact connection between two fixed contacts is attached.
  • the support arm can be latched to the inner end of the push button for transmitting its switch-on movement to the contact bridge support. Due to the latching method shown in the specified publication, an abrupt moment switching on of the contact bridge is achieved.
  • the known overcurrent protection switch is developed in such a way that the overcurrent release elements trigger forces to be applied are particularly low. This shortens the tripping time of the overcurrent protection switch according to the invention and an increased breaking capacity can be achieved.
  • the locking device is subject to less wear due to the reduced frictional forces on the mutual contact surfaces. Abrasion, material deformation and the like. This avoids or at least strongly suppresses within the spring mechanism, which increases the service life of the overcurrent protection switch and allows close tripping tolerances to be maintained over a longer operating period.
  • the tripping slide becomes a single-armed tripping lever with simple constructional means, which is arranged essentially parallel to the housing groove and whose axis of rotation is longitudinally displaceable axle journal in the housing groove.
  • the articulated connection between the guide arm of the contact bridge support and the release lever must allow a mutual displacement of these two parts in the direction of rotation of the release lever.
  • the articulated connection is formed by the engagement of the guide arm free end in a receiving opening running at right angles to the actuating direction at the hinge end of the release lever opposite the axle pin.
  • the intervention is preferably carried out with play, whereby the release lever is reliably carried by the contact bridge support during the switch-on movement, but the mentioned rotary movement of the release lever about its axle journal is possible within certain limits.
  • the measures are specified with which an advantageous additional function can be performed by the release lever.
  • the locking lever of the locking device namely has an approximately parallel to the trigger lever in its pivoting operating arm, by means of which the locking lever can be moved from its locking position by the trigger lever by pivoting it about the axle into the unlocking position.
  • the actuating handle or thermal and / or electromagnetic triggering elements can act on various components of the jumping mechanism in order to unlock the jumping mechanism.
  • the end of movement of the bimetal can act directly on the locking lever, its actuating arm or even the release lever in the unlocking direction. It is up to the designer at which point, for example, he arranges the bimetal in an apparently advantageous manner.
  • the configuration according to the invention leaves him various options here, how he arranges the corresponding triggering element and in which way he lets it act on the locking device.
  • Claim 11 specifies a possible embodiment of the subject matter of the invention, according to which the release lever in its locking position can be pivoted about its journal in the unlocking direction by actuating the push button. This pivoting can be transferred to the locking lever, which in turn can thereby be moved into the unlocking position and releases the locking of the release lever and thus the contact bridge carrier. Since the push button and the thermal release element can thus attack different components of the jumping mechanism, an advantageous functional arrangement of the jumping mechanism structure and thus a constructive simplification is achieved.
  • the measure mentioned in claim 12 represents a particularly simple possibility for forming the receiving opening of the release lever for the free end of the guide arm.
  • the pins for forming the receiving opening can take on further tasks, as indicated in claim 13.
  • the inner of the two pins facing the axle pin is acted upon by a tension spring fastened to the guide arm of the contact bridge support approximately at right angles to the actuating direction of the push button in such a way that it thereby rests continuously on the side edge of the push button facing the locking device and running parallel to the actuating direction.
  • the release lever takes on a defined position in any switching position of the spring mechanism, despite its possible rotatability about its journal.
  • the side edge of the push button Due to the uniqueness of the positional relationship between the side edge of the push button and the inner pin of the release lever, the side edge can be used for control tasks for the rotary movement of the release lever. Accordingly, according to claim 14 on this side edge of the push button is formed with its actuating direction forming an obtuse bevel, via which the release lever and the locking lever can be acted upon in the unlocking direction when the push button is switched off.
  • the control of a rotary movement via an inclined slope is a particularly simple design solution.
  • the side, mutually facing stop projections on the release lever and on the actuating arm of the locking lever ensure immediate transmission of the pivoting movement of the release lever to the locking lever.
  • an overcurrent protection switch is created which is structurally simple in construction, clearly structured and consequently very compact in construction, but all switching technology Has advantages such as instantaneous switching on and off and free tripping and also achieves a high switch-off power with tolerant long-term switching behavior.
  • the spring mechanism 1 lying in two housing half-shells, not shown, is actuated by a push button 3 which is longitudinally displaceable in the actuating direction 2.
  • This is designed as an elongated sliding body 4, the handle end 5 of which protrudes from the housing. Its inner end 6 is arranged within the housing in the area of overlap with the spring mechanism 1.
  • the push button 3 is acted upon in the switch-off direction by a switch-compression spring-like switch spring 7 acting in the region of its handle end 5.
  • the switch-off spring 7 automatically pushes the push button 3 into the switch-off position shown in FIG. 1 when the spring mechanism 1 is triggered.
  • the switch-off spring 7 is supported on a stop 8 fixed to the housing.
  • Switching level is understood to mean the level in which the pivoting and displacement movements of the switch mechanism take place. In the exemplary embodiment shown, it essentially coincides with the plane of the drawing.
  • the contact bridge support 9 which is designed as an angle lever, is arranged on the side of the inner end 6 of the push button 3. This consists essentially of a right-angled to the direction of actuation 2 of the push button 3, at the inner end 6 of the guide arm 10 guided past on the opposite side and a substantially parallel to the actuation direction 2 arranged support arm 11.
  • the contact bridge 13 At the free end 12 of the support arm 11 is the contact bridge 13 by means of a Contact bridge carrier 9 penetrating rivets 14 attached.
  • the contact bridge 13 is arranged approximately at right angles to the switching plane and connects the two lateral fixed contacts 15 which are aligned with one another in this direction, of which only the one facing the viewer can be seen in the figures.
  • the front fixed contact 15 is connected via a connecting lug 16 to the corresponding connecting line by means of a connecting terminal.
  • the rear fixed contact is in conductive connection with the bimetal 39, which contacts via its connecting lug 16 ⁇ with the second connecting line.
  • the connecting line and terminal for the terminal lug 16 and the rear fixed contact are omitted in the figures for the sake of clarity
  • the contact bridge support 9 which is designed as an angle lever, has, in the transition region between its guide 10 and support arm 11, a bearing pin 17 arranged transversely to the switching plane, which is located in a side of the push button 3 parallel to its actuating direction 2 arranged guide groove 18 is guided.
  • the contact bridge carrier 9 can carry out both a sliding movement and a pivoting movement in the switching plane.
  • the guide groove 18 and the fixed contacts 15 are arranged essentially in an extension on a line parallel to the direction of actuation 2 of the push button 3.
  • the locking device 19 of the spring mechanism 1 is arranged on the side of the push button 3 opposite these components.
  • An axle journal 24 is formed transversely to the switching plane on the bearing end 23 of the release lever 20 pointing in the switching-off direction 22, which engages in a substantially parallel to the direction of actuation 2 of the push button 3 laterally next to this housing groove 25 and is guided there to be longitudinally displaceable.
  • the trigger lever 20 can perform a pivoting movement in the switching plane around the journal 24.
  • the free end of the release lever 20 is articulated as a hinge end 26 to the free end 27 of the guide arm 10 of the contact bridge support 9.
  • the free end 27 engages between two pins 28, 29 attached to the release lever 20 and spaced apart in the switching direction 22 at right angles to the switching plane. These thus form a receiving opening 30 for the free end 27, which is tapered in relation to the remaining width of the guide arm 10.
  • the pin 28, which is closer to the axle pin 24, serves as the point of engagement of a helical tension spring 31 which is fastened to the contact arm support 9 by a pin 55 in the central region of the guide arm 10 is.
  • the housing groove 25 is designed in the manner of an elongated hole and has an oblique offset 32 in its lower region, through which the lower end of the housing groove 25 is offset in the direction of the push button 3.
  • the locking arm 33 of the T-shaped, three-armed locking lever 21 is arranged in the region of the oblique offset 32.
  • This lever is pivotally supported by the pivot bearing 34 at the intersection of its T-horizontal and vertical legs. It is acted upon by the helical compression spring 35, which is supported on the housing via the stop 56, in the locking direction (i.e. clockwise in relation to the figure), which acts on its loading arm 36 facing away from the locking arm 33 (locking force V, see FIG. 5).
  • the Latch 33 and loading arm 36 together form the T-horizontal leg of the locking lever 21.
  • the T-vertical leg is formed by the actuating arm 37 lying approximately parallel to the direction of actuation 2 of the push button 3, on which the movement end 38 of the bimetal 39 acting as a thermal release element acts.
  • the locking arm 33 is at its free end 40 in the region of the inclined offset 32 in overlap with the housing groove 25.
  • the stop surface 41 which is designed as a cylinder segment surface arranged transversely to the switching plane, forms one at the free end 40 of the locking arm 33 and the opposite counter bevel 42 of the inclined offset 32 wedge-shaped against the opening direction 22 opening inner angle region 43, the function of which becomes clear from the explanation of the switching kinematic sequence of the spring mechanism 1.
  • Fig. 1 the overcurrent protection switch is shown in its off position.
  • the contact bridge support 9, the push button 3 and the release lever 20 are in their upper extreme position, the Contact bridge support 9 is slightly tilted counterclockwise around its bearing pin 17 with respect to FIG. 1.
  • the push button 3 (FIG. 2) is actuated, its latching lug 44, which is laterally attached to its inner end 6, engages in the latching recess 46 in the contact bridge carrier 9 on the rear side 45 facing away from the fixed contacts 14.
  • the contact bridge support 9 is carried along against the loading force of the contact pressure spring 47 clamped between the guide arm 10 and a stop 48 fixed to the housing, approximately in the actuating direction 2.
  • the contact bridge support 9 is only shifted longitudinally, but remains in its tilted state.
  • the contacts acting on the locking device 19 in this position can be explained with reference to FIGS. 3 and 5.
  • the contact pressure spring 47 provides not only the contact pressure itself, but also the breaking force tearing the contact bridge carrier 9 away from the fixed contacts 15 in the breaking direction 22.
  • This switch-off force A is transmitted via the guide arm 10 to the release lever 20 and acts on it in the switch-off direction 22.
  • the switch-off force A is broken down into two subcomponents F1, F2 in the manner of a force parallelogram.
  • the subcomponent F2 acting on the stop surface 41 is reduced.
  • the push button 3 can be held in its switched-on position, but the triggering movement of the contact bridge carrier is not influenced (free release).
  • the locking recess 46 can namely no longer come into engagement with the locking lug 44 of the push button, as a result of which the switch-off movement could be prevented.
  • the manual switch-off via the push button 3 is explained with reference to FIG. 3.
  • the trigger lever 20 is under the influence of the tension spring 31 with its pin 28 on the locking device 19 facing side edge 51 of the push button 3.
  • a run-up slope 52 is formed on this side edge 51, which forms an obtuse angle with the side edge 51.
  • the defined on-position of the push button 3 shown in FIG. 3 is achieved by inserting the axle pin 24 of the release lever 20 in the angular range between the side edge 51 and the support slope 52 maintained.
  • the torque applied by the tension coil spring 31 and exerted transversely to the actuating direction 2 on the release lever 20 is namely greater than the counter torque transmitted to the release lever 20 by the switch-off spring 7 via the bevel 52.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
EP87113455A 1986-10-02 1987-09-15 Überstromschutzschalter Expired - Lifetime EP0263331B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87113455T ATE68909T1 (de) 1986-10-02 1987-09-15 Ueberstromschutzschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8626325U 1986-10-02
DE8626325U DE8626325U1 (de) 1986-10-02 1986-10-02 Überstromschutzschalter

Publications (2)

Publication Number Publication Date
EP0263331A1 EP0263331A1 (de) 1988-04-13
EP0263331B1 true EP0263331B1 (de) 1991-10-23

Family

ID=6798855

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113455A Expired - Lifetime EP0263331B1 (de) 1986-10-02 1987-09-15 Überstromschutzschalter

Country Status (5)

Country Link
US (1) US4814738A (enrdf_load_stackoverflow)
EP (1) EP0263331B1 (enrdf_load_stackoverflow)
JP (1) JPS6391923A (enrdf_load_stackoverflow)
AT (1) ATE68909T1 (enrdf_load_stackoverflow)
DE (2) DE8626325U1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4424332A1 (de) * 1994-07-11 1996-01-18 Kopp Heinrich Ag Leitungsschutzschalter

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5710399A (en) * 1996-05-01 1998-01-20 General Electric Company Electronic trip unit conversion kit for high ampere-rated circuit breakers
DE19856707A1 (de) * 1998-12-09 2000-06-21 Ellenberger & Poensgen Schutzschalter zur Absicherung von Stromkreisen
US6483416B2 (en) * 2001-02-22 2002-11-19 Tsung-Mou Yu Overload protection device of a press type switch
WO2005081377A1 (fr) * 2004-02-19 2005-09-01 Hong Kong Productivity Council Appareil declencheur de fuite electrique pour defaut de mise a la masse

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR753274A (fr) * 1932-03-30 1933-10-12 Stotz Kontakt Gmbh Interrupteur automatique ou disjoncteur à maxima d'installation, avec commande par bouton-poussoir
FR2067954A5 (enrdf_load_stackoverflow) * 1969-11-20 1971-08-20 Crouzet & Cie
DE2123765B1 (de) * 1971-05-13 1972-05-31 Ellenberger & Poensgen Dr]ckknopfbet[tigter ]berstromschalter
FR2258698B1 (enrdf_load_stackoverflow) * 1974-01-22 1976-10-08 Unelec
DE2511223C2 (de) * 1975-01-23 1978-02-09 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetätigter Überstromschalter mit thermischer Auslösung
DE2502579C2 (de) 1975-01-23 1977-02-17 Ellenberger & Poensgen Druckknopfbetaetigter ueberstromschalter mit thermischer ausloesung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4424332A1 (de) * 1994-07-11 1996-01-18 Kopp Heinrich Ag Leitungsschutzschalter
DE4424332B4 (de) * 1994-07-11 2005-10-20 Kopp Heinrich Ag Leitungsschutzschalter

Also Published As

Publication number Publication date
JPH056784B2 (enrdf_load_stackoverflow) 1993-01-27
DE8626325U1 (de) 1987-01-02
JPS6391923A (ja) 1988-04-22
EP0263331A1 (de) 1988-04-13
US4814738A (en) 1989-03-21
DE3774064D1 (de) 1991-11-28
ATE68909T1 (de) 1991-11-15

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