EP0127784B1 - Overcurrent circuit breaker - Google Patents

Overcurrent circuit breaker Download PDF

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Publication number
EP0127784B1
EP0127784B1 EP84105015A EP84105015A EP0127784B1 EP 0127784 B1 EP0127784 B1 EP 0127784B1 EP 84105015 A EP84105015 A EP 84105015A EP 84105015 A EP84105015 A EP 84105015A EP 0127784 B1 EP0127784 B1 EP 0127784B1
Authority
EP
European Patent Office
Prior art keywords
contact
contact bridge
lever
pivoting
overload protective
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
Application number
EP84105015A
Other languages
German (de)
French (fr)
Other versions
EP0127784A1 (en
Inventor
Harald Dipl.-Ing. Heil
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.)
Lindner Fabrik Elektrischer Lampen und Apparate GmbH
Original Assignee
Lindner Fabrik Elektrischer Lampen und Apparate 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 Lindner Fabrik Elektrischer Lampen und Apparate GmbH filed Critical Lindner Fabrik Elektrischer Lampen und Apparate GmbH
Priority to AT84105015T priority Critical patent/ATE21186T1/en
Publication of EP0127784A1 publication Critical patent/EP0127784A1/en
Application granted granted Critical
Publication of EP0127784B1 publication Critical patent/EP0127784B1/en
Expired legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/046—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using snap closing mechanisms
    • 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
    • H01H9/10—Adaptation for built-in fuses
    • H01H9/104—Adaptation for built-in fuses with interlocking mechanism between switch and fuse
    • 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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate

Definitions

  • the invention relates to an overcurrent protection switch with the features of the preamble of claim 1.
  • an elongated contact bridge is pivotably arranged in the switch level, which can be controlled manually by means of a handle, namely a rocker arm, and cooperates with a fixed contact to close the current path.
  • a handle namely a rocker arm
  • the contact bridge is acted upon by a spring which acts on the rocker arm in such a way that its spring preload is increased when the rocker arm is in the switched-on position.
  • the end of the contact bridge remote from the contact is latched by a ratchet lever which interacts with a release device, namely a magnetic release, the contact bridge is supported approximately in the middle in the manner of a two-armed lever on a rotary bearing which is arranged on a contact bridge holder.
  • the pawl lever If, in the event of a short circuit, the pawl lever is actuated by the triggering device, it releases the end of the contact bridge remote from the contact, so that it can suddenly swivel away from the fixed contact under the tension of the spring. In the event of a restart (by moving the rocker arm first to the off position and then turning it back to the on position), the contact end of the contact bridge is slowly moved against the fixed contact, which disadvantageously results in creeping contact. The contact pressure is exerted by the resiliently remote end of the contact bridge, which makes the contact bridge relatively complex overall.
  • the invention has for its object to simplify the design of an overcurrent protection switch, while maintaining the sudden, spring-assisted switch-off, a torque switch is possible and in particular the number of necessary spring elements should be reduced.
  • the contact bridge pivot As the essence of the invention, it is considered, in the case of manual switching on and off, to make the contact bridge pivot as a one-armed lever around the non-contact end, which is supported by the latch lever, the only spring acting on the contact bridge acting in the contact direction and in In the event of an emergency release, the effect of the same contact spring can be used to break the contact, which is done by the fact that in the event of an emergency release the contact bridge support, d. H. the fulcrum of the contact bridge, in the middle of which is laid. It is therefore essential to the invention that the only contact spring acts between the two possible pivot points, namely that at the end remote from the contact for manual switching on and off and the central pivot bearing on the contact bridge.
  • the contact spring is effective in contact-opening or contact-closing while maintaining its pulling direction. In connection with the articulation beyond dead center with subsequent freewheeling into one or the other position by the spring action, an abrupt contact closure (moment engagement) of the contact is achieved.
  • Claims 2, 3 and 4 relate to different types of design of the central pivot bearing, namely
  • lateral guide grooves are arranged in the central region of the contact bridge, as a result of which in particular the end remote from the contact can pivot smoothly and uninhibitedly into the switch-off position in the event of an emergency release.
  • the housing-fixed stop effective for arc quenching forms a counterbearing when the switching lock is tensioned solely by pressure exerted by the pressure ram in accordance with the characterizing feature of claim 8.
  • the locking stop according to claim 14 serves to ensure a momentary release in the event of an overcurrent.
  • the ratchet lever can therefore not according to the deflection of the bimetal by the spring acting on it in the contact opening direction be deflected. Rather, the locking stop ensures that the latch lever is unlocked abruptly only after the desired deflection of the bimetal has been reached in the event of an overcurrent. This is achieved in a particularly space-saving manner according to the characterizing feature of claim 15.
  • the pressure tappet and the control link articulated with it form a toggle lever, the dead center position of which is the extended position of the toggle lever.
  • the rocker arm only has the function of moving this toggle lever over its extended position against the pressure of the contact spring. Then the control arm is swiveled into its respective swivel end position automatically and independently of the swivel speed of the rocker arm only under the pressure of the contact spring.
  • claims 7 to 22 relate to switch designs with a contact bridge holder
  • claims 23 ff Describe advantageous developments of switch lock designs in which the contact bridge is held and guided directly in the housing by groove guides.
  • the overcurrent protection switch contains in the switch housing 1 the contact spring 2, the contact bridge 4 interacting with the fixed contact 3, the contact bridge holder 5, the latch lever 6, the strip-shaped bimetal 7 and the rocker arm 8 rotatably mounted on the switch housing 1.
  • the passage of current through the switch between the two connection terminals 9, 10 takes place via the bimetal 7, the connecting cable 12, the contact rail 11, the connecting cable 12a, the contact bridge 4 and the fixed contact 3, which in turn via the fuse 26 with its two connecting contacts 27, 28 and the rail 25 with the connecting terminal 10 is in an electrically conductive connection.
  • the contact bridge 4 is designed as a two-armed lever. As a result, it has the contact arm 13 close to the contact and the holding arm 14 remote from the contact.
  • the contact bridge bearing is marked with 15.
  • the non-contact holding arm 14 of the contact bridge 4 is acted upon by the contact spring 2 in the contact opening direction.
  • the contact spring 2 is a tension spring whose distal end 16 is fastened to the switch housing 1 in the vicinity of the rocker arm 8. Through the contact spring 2, the contact bridge 4 is pulled with the end of its holding arm 14 against a swivel limiting stop 17 which is rotatably mounted on the latch lever 6 about an axis perpendicular to the longitudinal plane of the switch.
  • the pawl lever 6 is mounted on the switch housing 1 in the area of its bearing end 18 in the switch plane about the axis 19.
  • the axis 19 lies between the contact bridge 4 and the rocker arm 8.
  • the pivoting end 20 of the latch lever 6 can be deflected by the bimetal 7 from its normal position shown in FIGS. 1, 2 and 4 ff.
  • the pawl lever 6 Into the pivoted position shown in FIG. 3.
  • the pawl lever 6 also contains a fixed stop protruding into the path of the further contact opening in the contact opening direction 21 of the holding arm 14 of the contact bridge 4 22.
  • the contact bridge holder 5 is pivotally mounted on the switch housing 1 with its end facing away from the contact bridge bearing 15 and is acted upon by a pressure plunger 23 which is effective against the pulling direction of the contact spring 2 and can be transferred from the rocker arm 8 via a dead center with a subsequent automatic movement sequence.
  • the axis 19 of the pawl lever 6 is arranged at its end facing the rocker arm 8.
  • the bearing axis 29 of the contact bridge holder 5 lies between the axis 19 and the pivot end 20 of the latch lever 6.
  • the pivot limiting stop 17 is only effective in the contact opening direction 21 against the holding arm 14 of the contact bridge 4 and thereby limits its pivoting path in the contact opening direction 21.
  • the end 31 of the contact arm 13 of the contact bridge 4 bears against the stop 32 which is fixed to the housing and which is in particular in contact with the extinguishing chamber designated as a whole by 33.
  • the pivoting end 20 of the pawl lever 6 is acted upon in the unlocking direction 34 by the unlocking spring 35 against the locking stop 36, which in turn can be pivoted about an axis running perpendicular to the central longitudinal direction of the switch housing 1 by the deflection of the bimetal 7 from its operative position.
  • the locking stop 36 is under the pressure of a return spring (not shown) which is effective in the direction of the arrow 37 in the direction of the bimetallic pivoting.
  • the bimetal 7 runs approximately parallel to the ratchet lever 6 next to this. Its deflecting end 38, which lies approximately next to the pivoting end 20 of the ratchet lever 6, acts upon the arm 39 of the angle lever 40 pivotably mounted on the switch housing 1 in the switch plane, the other arm 41 of which acts on the locking stop 36 in the unlocking direction opposite to the direction of the arrow 37 of its spring action, whereby the locking stop on reaching its unlocking position (FIG. 3) releases the pivoting of the latch lever 6 taking place under the pressure of the unlocking spring 35 in the unlocking direction 34. In its unlocked position, the pivoting end 20 of the latch lever 6 overlaps the V-shaped, sector-shaped recess 42 of the locking stop 36 and plunges into this recess 42.
  • the plunger 23 is articulated between two pivot end positions (FIGS. 1, 4 on the one hand and FIG. 6 on the other hand) in the switch plane at the end 43 of a control arm pivotally mounted on the switch housing 1.
  • the two pivot end positions are on either side of a dead center position closest to the contact bridge holder 5.
  • the control arm is designed as a disk 45 rotatably mounted about the axis 44, which rotatably supports the pressure plunger 23 with its rocker arm-side end 46 on its periphery (end 43).
  • the rocker arm 8 is pivotally mounted about the axis 44.
  • the control arm formed by the disc 45 can be moved over its bottom dead center position by actuating the rocker arm 8, after which it automatically swivels under the pressure of the contact spring 2 into its respective pivot end position (FIGS. 1, 4 on the one hand and FIG. 6 on the other hand).
  • the bearing sleeve 47 of the rocker arm 8 surrounding the disc 45 is provided in the region of the articulation of the control arm (disc 45) with a cutout 58, the length of which points in the circumferential direction approximately the pivoting path of the control arm bearing (end 46 of the pressure tappet 23) between its dead center position and its pivoting end positions corresponds.
  • the pressure plunger 23 runs approximately parallel to the ratchet lever 6 and rests with its free end 48 on the upper edge 49 of the contact bridge holder 5.
  • the free end 48 of the pressure ram 23 is rounded off as a rolling track. It lies in the space between the bearing end 18 of the latch lever 6 and the housing wall 50 flanking the fuse 26 with lateral mobility.
  • the contact bridge support 5 contains two cheeks 51 running parallel to one another in the switch plane, which are firmly connected to one another and between which the contact bridge 4 is arranged.
  • the latch lever 6 is also arranged between the cheeks 51.
  • the bearing axis of the contact bridge 4 is formed by pins 52 formed on both sides of the contact bridge 4 and which lie in bearing eyes 53 inserted into the cheeks 51.
  • the contact bridge 4 is formed by a metal stamped part.
  • the pins 52 are made from laterally protruding from the contact bridge 4, with the contact bridge 4 integral tabs.
  • the bearing eyes 53 each have a convex side wall 54 on the contact spring side as a counter bearing for the pivoting movement of the contact bridge 4.
  • the pawl lever 6 is a sheet metal part bent in a U-shaped cross section, between the U-webs of which the holding arm 14 of the contact bridge 4 projects.
  • the pivot limiting stop 17 is designed as a shaft rotatably mounted in the cheeks 61 of the ratchet lever 6, the cross-section of which is approximately semicircular in the stop region lying between the U-legs.
  • the holding arm 14 of the contact bridge 4 rests with its end on the lower circumferential region 56 of the semicircular cross section of the pivoting limit stop 17 that is adjacent to the semicircular diameter 55 and which is caused by its rotation by rotating the shaft or pivoting away the pawl lever 6 the holding arm 14 can be brought out.
  • the bimetal 7 or the locking stop 36 can also be deflected in a known manner by means of a magnetic release device designated overall by 57.
  • the deflecting end 38 of the bimetal 7 is pivoted counterclockwise by its heating or by the magnetic release device 57 around its upper clamping end.
  • the deflecting end 38 strikes against the arm 39 of the angle lever 40 and pivots the angle lever 40 clockwise about its axis.
  • the other arm 41 of the angle lever 40 rotates the locking stop 36 counterclockwise.
  • the recess 42 comes into overlap with the pivoting end 20 of the ratchet lever 6.
  • the unlocking spring 35 presses the pivoting end 20 of the ratchet lever 6 into the recess 42, whereby the ratchet lever 6 pivots counterclockwise about its axis 19.
  • the rocker arm 8 was not actuated during the above-described movements within the switch.
  • the switch assumes the limit switch position shown in FIG. 4.
  • the rocker arm 8 In order to be able to restart, the rocker arm 8 must first be pivoted clockwise about the axis 44.
  • the bearing sleeve 47 of the rocker arm 8 presses the end 46 of the pressure ram 23 in front of it with its front edge 59 which delimits the cutout 58.
  • the disk 45 is rotated with the same movement. This means that the toggle lever formed by the disk 45 and the pressure tappet 23 is pushed into its extended position. With this transfer of the toggle lever formed into its extended position, the pressure ram 23 presses with its free end 48 the upper edge 49 of the contact bridge holder 5 downward. This pivots counterclockwise about its bearing axis 29 and moves the contact bridge bearing 15 downward.
  • the end of the holding arm 14 of the contact spring sweeps past the semicircular diameter 55 of the swivel limiting stop 17. As soon as the holding arm 14 has passed the swivel limit stop 17, it becomes under the restoring force emanating from the restoring spring 30. pivoted back clockwise into its initial position shown in the figures. If the toggle lever formed by the disk 45 and the pressure tappet 23 passes through its extended or dead center position by pivoting the rocker arm 8 further, the tension of the contact spring 2 has reached its maximum. As soon as the aforementioned stretching or dead center position has been exceeded, the pressure exerted by the contact spring 2 becomes fully effective in the sense of the knee joint of the toggle lever formed by the disk 45 and the pressure plunger 23 being bent again.
  • the disc 45 pivots clockwise through the free space of the cutout 58 of the bearing sleeve 47 of the rocker arm 8 until the plunger 23 laterally abuts the housing wall 50 and thus puts an end to the pivoting of the disc 45.
  • the pressure tappet 23 then assumes the position shown in FIG. 6, irrespective of whether the rocker arm 8 is already in its swung-out end position shown in FIG. 6 or is held in the intermediate position in which it is held by the disk 45 and the pressure tappet 23 formed toggle lever has been pushed through its extension or dead center position.
  • the contact spring 2 consequently relaxes and pulls the holding arm 14 of the contact spring 4 against the pivot limiting stop 17, which has been pivoted into the pivoting path of the holding arm 14 by its return spring 30, with the result that the further pivoting of the contact bridge 4 relative to the contact bridge holder 5 is blocked is. Due to the stop of the holding arm 14 on the swivel limit stop 17, further relaxation of the contact spring 2 is no longer possible.
  • the switch is in the switch-on position (FIG. 6).
  • the swivel limiting stop 17 cannot become effective with respect to the holding arm 14 of the contact bridge 4 because it lies outside of its swivel path. Consequently, if the rocker arm 8 is pivoted again counterclockwise in the switch-on direction, the contact spring 2, after passing through the toggle lever controlled by it, tears the holding arm 14 of the contact bridge 4 upward due to its dead center or extended position. However, this does not find a stop at the swivel limit stop 17, but is immediately pulled against the fixed stop 22 of the pawl lever 6, which only swivels the pawl lever 6 back under compression of the unlocking spring 35 (FIG. 4), but without the contact bridge 4 in it Einschaltstelluhg is transferred.
  • a contact bridge 104 is arranged in a switch housing 101 so that it can pivot about a contact bridge bearing 115 and is acted upon in the contact closing direction by the contact spring 102.
  • the contact end lies against the fixed contact 103, the end remote from the contact (holding arm 114) is held in the region of the contact bridge bearing 115 by the latching lever 106.
  • the central rotary bearing 170 is formed by a housing projection 172 lying on the contact side 171 of the contact bridge 104, a small distance 173 being present between the housing projection 172 and the contact side 171 in the switched-on position.
  • the contact bridge bearing 115 consists of housing grooves 174 which run approximately parallel to the contact closing direction and in which side projections 175 of the end remote from the contact slidably lie.
  • the pawl lever 106 is provided with an elongated hole guide 176 which engages around the side projections 175 in the manner of a backdrop.
  • the central longitudinal direction 177 of the elongated hole guide 176 extends at an angle to the central longitudinal direction 178 of the housing grooves 174, so that in the event of a manual force P H acting on the contact bridge 104 (cf. Pawl lever 106 in the direction of arrow 179 and subsequent latching takes place.
  • the ratchet lever By pulling the contact spring 102, in the case of unlatching (FIG. 11), the ratchet lever is pivoted against the direction of arrow 179.
  • the contact bridge 104 rotates in the manner of a two-armed lever around the housing projection 172, the contact path being torn open by the pull of the contact spring 102.
  • the contact bridge 104 acts exclusively as a one-armed lever which rotates about its contact bridge bearing 115.
  • Fig. 13 illustrates that the latch lever 106 has a U-shaped cross-section and with its U-legs 180 engages around the non-contact end of the contact bridge 104 such that the side projections 175 pass through the elongated hole guides 176 and engage in the housing grooves 174.
  • FIG. 14 represents a “mixed solution” of the two previously described exemplary embodiments. This is because use is made of the groove guide of the second exemplary embodiment according to FIGS. 9 to 13, the housing grooves 274 arranged in the switch housing 201 with associated side projections 275 in the middle region of the contact bridge 204 are relocated, but the contact lever latching with the latch lever 206 is used at the end remote from the contact (holding arm 214), as is shown in the first exemplary embodiment according to FIGS. 1 to 8.

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  • Electronic Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1. Manually operated overload protective switch, in particular permetering switch, having trip-free release and the following features : an extended contact bridge (4; 104; 204) which is springloaded (contact spring 2; 102) on one side is arranged in a switch housing (1; 101; 201), the pivot movement of which contact bridge (4; 104; 204) can be manually controlled in the switch plane by a handle (rocking lever 8), which contact bridge (4; 104; 204) interacts with a fixed contact (3; 103) to close the current path, in the switch-on position, at its contact-remote end (retaining arm 14; 114; 214), can be locked (locking position) in a first position by a ratchet lever (6; 106; 206) interacting with a tripping device, and can be supported approximately in its centre area on one side to form a central pivot bearing (contact bridge bearing 15) supporting a two-arm lever, characterized by the following features : the handle (rocking lever 8) or an intermediate member (push rod 23) interacting with this handle acts on the contact bridge (4; 104; 204) in the opening pivoting direction for pivoting in the manner of a single-arm lever, pivotally mounted at its contact-remote end, while passing dead centre and subsequently running free in the area of the pivoting end positions of the handle, the spring (contact spring 2; 102; 202) loads the contact bridge (4; 104; 204) in the contact closing direction in the contact bridge area located between the contact-remote end and the central pivot bearing (contact bridge bearing 15, pivot bearing 170), the contact-remote end of the contact bridge (4; 104; 204), in the event of tripping, after release by the ratchet lever (6; 106; 206), pivots away in the loading direction of the contact spring (2; 102; pulling direction of the contact spring designed as a tension spring), with the contact bridge (4; 104; 204) turning as a two-arm lever while seated on the central pivot bearing or when the latter comes into effect, and the contact end lifting from the fixed contact (3; 103) under the force of the contact spring (2; 102).

Description

Die Erfindung betrifft einen Überstromschutzschalter mit den Merkmalen des Oberbegriffes des Anspruches 1.The invention relates to an overcurrent protection switch with the features of the preamble of claim 1.

Aus der DE-A-2242128 ist ein Mechanismus für Selbstschalter, nämlich Überstromschutzschalter bekannt, dessen wesentliche Merkmale sich wie folgt darstellen : In einem Schaltergehäuse ist eine langgestreckte Kontaktbrücke verschwenkbar in Schalterebene angeordnet, die durch eine Handhabe, nämlich einen Kipphebel, manuell steuerbar ist und mit einem Festkontakt zur Schließung des Strompfades zusammenwirkt. In Kontaktöffnungsrichtung ist die Kontaktbrücke durch eine Feder beaufschlagt, die derart am Kipphebel angreift, daß bei in Einschaltstellung befindlichem Kipphebel ihre Federvorspannung erhöht ist. In Einschaltstellung wird das kontaktferne Ende der Kontaktbrücke durch einen mit einer Auslösevorrichtung, nämlich einem Magnetauslöser, zusammenwirkenden Klinkenhebel verrastet, die Abstützung der Kontaktbrücke erfolgt etwa mittig nach Art eines zweiarmigen Hebels an einem Drehlager, das an einem Kontaktbrückenhalter angeordnet ist.From DE-A-2242128 a mechanism for self-switches, namely overcurrent protection switches, is known, the main features of which are as follows: In an switch housing, an elongated contact bridge is pivotably arranged in the switch level, which can be controlled manually by means of a handle, namely a rocker arm, and cooperates with a fixed contact to close the current path. In the contact opening direction, the contact bridge is acted upon by a spring which acts on the rocker arm in such a way that its spring preload is increased when the rocker arm is in the switched-on position. In the switched-on position, the end of the contact bridge remote from the contact is latched by a ratchet lever which interacts with a release device, namely a magnetic release, the contact bridge is supported approximately in the middle in the manner of a two-armed lever on a rotary bearing which is arranged on a contact bridge holder.

Wird im Kurzschlußfalle der Klinkenhebel durch die Auslösevorrichtung betätigt, gibt er das kontaktferne Ende der Kontaktbrücke frei, so daß diese unter dem Zug der Feder von dem Festkontakt schlagartig wegschwenken kann. Im Falle des Wiedereinschaltens (durch Verbringen des Kipphebels zunächst in Ausschaltstellung und nachfolgende Rückdrehung in die Einschaltstellung) wird das Kontaktende der Kontaktbrücke langsam gegen den Festkontakt geführt, woraus nachteiligerweise eine schleichende Kontaktgabe resultiert. Der Kontaktdruck wird durch das federnd ausgebildete kontaktferne Ende der Kontaktbrücke ausgeübt, wodurch die Kontaktbrücke insgesamt relativ kompliziert ausgebildet ist.If, in the event of a short circuit, the pawl lever is actuated by the triggering device, it releases the end of the contact bridge remote from the contact, so that it can suddenly swivel away from the fixed contact under the tension of the spring. In the event of a restart (by moving the rocker arm first to the off position and then turning it back to the on position), the contact end of the contact bridge is slowly moved against the fixed contact, which disadvantageously results in creeping contact. The contact pressure is exerted by the resiliently remote end of the contact bridge, which makes the contact bridge relatively complex overall.

Der Erfindung liegt die Aufgabe zugrunde, einen Überstromschutzschalter konstruktiv zu vereinfachen, wobei unter Beibehaltung der schlagartigen, federkraftunterstützten Ausschaltung eine Momenteinschaltung möglich und insbesondere die Anzahl der notwendigen Federelemente reduziert sein soll.The invention has for its object to simplify the design of an overcurrent protection switch, while maintaining the sudden, spring-assisted switch-off, a torque switch is possible and in particular the number of necessary spring elements should be reduced.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.This object is achieved by the characterizing features of claim 1.

Als Kern der Erfindung wird es angesehen, im Falle der manuellen Ein- und Ausschaltung die Kontaktbrücke gleichsam als einarmigen Hebel um das kontaktferne Ende verschwenken zu lassen, das über den Klinkenhebel abgestützt ist, wobei die einzige auf die Kontaktbrücke wirksame Feder in Kontaktrichtung wirkt und im Falle der Notauslösung die Wirkung eben derselben Kontaktfeder zum Aufreißen des Kontaktes heranzuziehen, was dadurch geschieht, daß im Notauslösefall die Kontaktbrückenabstützung, d. h. der Drehpunkt der Kontaktbrücke, in deren Mittelbereich verlegt wird. Mithin ist es erfindungswesentlich, daß die einzige Kontaktfeder zwischen den beiden möglichen Drehpunkten, nämlich dem am kontaktfernen Ende zur manuellen Ein- und Ausschaltung und dem mittigen Drehlager an der Kontaktbrücke angreift. Je nachdem, ob der Klinkenhebel in Verriegelungsstellung oder Entriegelungsstellung ist, wird somit die Kontaktfeder unter Beibehaltung ihrer Zugrichtung kontaktöffnend oder kontaktschließend wirksam. In Verbindung mit der totpunktüberschreitenden Anlenkung mit anschließendem Freilauf in die eine oder andere Stellung durch die Federbeaufschlagung wird eine schlagartige Kontaktschließung (Momenteinschaltung) des Kontaktes erzielt.As the essence of the invention, it is considered, in the case of manual switching on and off, to make the contact bridge pivot as a one-armed lever around the non-contact end, which is supported by the latch lever, the only spring acting on the contact bridge acting in the contact direction and in In the event of an emergency release, the effect of the same contact spring can be used to break the contact, which is done by the fact that in the event of an emergency release the contact bridge support, d. H. the fulcrum of the contact bridge, in the middle of which is laid. It is therefore essential to the invention that the only contact spring acts between the two possible pivot points, namely that at the end remote from the contact for manual switching on and off and the central pivot bearing on the contact bridge. Depending on whether the latch lever is in the locking position or unlocking position, the contact spring is effective in contact-opening or contact-closing while maintaining its pulling direction. In connection with the articulation beyond dead center with subsequent freewheeling into one or the other position by the spring action, an abrupt contact closure (moment engagement) of the contact is achieved.

Ansprüche 2, 3 und 4 beziehen sich auf unterschiedliche Arten der Ausbildung des mittigen Drehlagers, nämlichClaims 2, 3 and 4 relate to different types of design of the central pivot bearing, namely

in an sich bekannter Weise - über einen Kontaktbrückenhalter oder mittels eines oder mehrerer Gehäusevorsprünge, die die Kontaktbrücke mittig beaufschlagen oder mittels des Freiendes des Zwischengliedes, das das mittige Drehlager bildet (Anspruch 4). Bei der Lösung gemäß Anspruch 3 sind im Gehäuse vorgesehene, die Auslösebewegung gestattende Führungsmittel erforderlich, die gemäß Anspruch 5 als Gehäusenuten mit darin geführten Seitenvorsprüngen am kontaktfernen Ende der Kontaktbrücke ausgebildet sein können, wodurch in vorteilhafter Weise im Bereich der Kontaktbrückenmitte Raum für andere Schaltschloßelemente, beispielsweise das Zwischenglied, geschaffen ist. Bei einer weiteren Lösung sind im Mittelbereich der Kontaktbrücke seitliche Führungsnuten angeordnet, wodurch insbesondere das kontaktferne Ende im Notauslösefall reibungslos und ungehemmt in die Ausschaltstellung verschwenken kann. Somit haben beide Arten der Kontakthebelhalterung/Führung ihnen eigene Vorteile.in a manner known per se - via a contact bridge holder or by means of one or more housing projections which act on the contact bridge in the center or by means of the free end of the intermediate member which forms the central pivot bearing (claim 4). In the case of the solution according to claim 3, guide means provided in the housing and allowing the release movement are required, which can be designed according to claim 5 as housing grooves with side projections guided therein at the end of the contact bridge remote from the contact, thereby advantageously providing space for other switching element elements in the area of the contact bridge center, for example the pontic is created. In a further solution, lateral guide grooves are arranged in the central region of the contact bridge, as a result of which in particular the end remote from the contact can pivot smoothly and uninhibitedly into the switch-off position in the event of an emergency release. Both types of contact lever holder / guidance therefore have their own advantages.

Durch das kontaktfederunterstützte Zusammenfallen des Kniehebels, gebildet aus Kontaktbrücke und Kontaktbrückenhalter, in die Knickstellung wird ein besonders schnelles, schlagartiges Öffnen des Kontaktes im Überstromfalle erreicht. Die Kennzeichnungsmerkmale der Ansprüche 9 und 10 begünstigen die besonders raumsparende Ausbildung des Schaltschlosses.Due to the contact spring-assisted collapse of the toggle lever, formed from the contact bridge and contact bridge holder, into the kink position, particularly rapid, abrupt opening of the contact is achieved in the event of an overcurrent. The labeling features of claims 9 and 10 favor the particularly space-saving design of the key switch.

Gemäß Kennzeichnungsmerkmal des Anspruches 13 bildet der zum Lichtbogenlöschen wirksame gehäusefeste Anschlag ein Gegenlager beim Spannen des Schaltschlosses allein durch seitens des Druckstößels ausgeübten Druck gemäß Kennzeichnungsmerkmal des Anspruches 8.According to the characterizing feature of claim 13, the housing-fixed stop effective for arc quenching forms a counterbearing when the switching lock is tensioned solely by pressure exerted by the pressure ram in accordance with the characterizing feature of claim 8.

Der Verriegelungsanschlag gemäß Anspruch 14 dient zur Sicherstellung einer Momentauslösung im Überstromfalle. Der Klinkenhebel kann also nicht entsprechend der Ausbiegung des Bimetalls durch die ihn in Kontaktöffnungsrichtung beaufschlagende Feder ausgelenkt werden. Vielmehr sorgt der Verriegelungsanschlag dafür, daß die Entriegelung des Klinkenhebels schlagartig erst nach Erreichung der Sollausbiegung des Bimetalls im Überstromfalle erfolgt. Dies wird nach dem Kennzeichnungsmerkmal des Anspruches 15 in besonders raumsparender Weise bewirkt.The locking stop according to claim 14 serves to ensure a momentary release in the event of an overcurrent. The ratchet lever can therefore not according to the deflection of the bimetal by the spring acting on it in the contact opening direction be deflected. Rather, the locking stop ensures that the latch lever is unlocked abruptly only after the desired deflection of the bimetal has been reached in the event of an overcurrent. This is achieved in a particularly space-saving manner according to the characterizing feature of claim 15.

Durch das Kennzeichnungsmerkmal des Anspruches 16 bilden der Druckstößel und der mit ihm gelenkig verbundene Schaltlenker einen Kniehebel, dessen Totpunktlage die Streckstellung des Kniehebels ist. Der Kipphebel hat lediglich die Funktion, diesen Kniehebel gegen den Druck der Kontaktfeder über seine Streckstellung hinüberzuführen. Danach erfolgt das Weiterschwenken des Schaltlenkers in seine jeweilige Schwenkendstellung unbehindert selbsttätig und unabhängig von der Schwenkgeschwindigkeit des Kipphebels allein unter dem Druck der Kontaktfeder.Due to the characterizing feature of claim 16, the pressure tappet and the control link articulated with it form a toggle lever, the dead center position of which is the extended position of the toggle lever. The rocker arm only has the function of moving this toggle lever over its extended position against the pressure of the contact spring. Then the control arm is swiveled into its respective swivel end position automatically and independently of the swivel speed of the rocker arm only under the pressure of the contact spring.

Während sich die Ansprüche 7 bis 22 auf Schalterausführungen mit einem Kontaktbrückenhalter beziehen, beschreiben die Ansprüche 23 ff. vorteilhafte Weiterbildungen von Schaltschloßausbildungen, bei denen die Kontaktbrücke durch Nutführungen unmittelbar im Gehäuse gehaltert und geführt ist.While claims 7 to 22 relate to switch designs with a contact bridge holder, claims 23 ff. Describe advantageous developments of switch lock designs in which the contact bridge is held and guided directly in the housing by groove guides.

Die Erfindung wird an Hand dreier Ausführungsbeispiele in den Zeichnungsfiguren erläutert. Es zeigt :The invention is explained using three exemplary embodiments in the drawing figures. It shows :

  • Figur 1 einen Längsschnitt durch einen erfindungsgemäß ausgebildeten Schalter in dessen Einschaltstellung,FIG. 1 shows a longitudinal section through a switch designed according to the invention in its switched-on position,
  • Figur 2 eine Prinzipdarstellung der für die Schalterstellung gemäß Fig. 1 wesentlichen Schalterteile,FIG. 2 shows a basic illustration of the switch parts essential for the switch position according to FIG. 1,
  • Figur 3 einen Längsschnitt entsprechend Fig. 1 unmittelbar nach erfolgter Überstromauslösung vor Rückführung des Klinkenhebels in seine Normalstellung (Fig. 1, 4, 6),3 shows a longitudinal section corresponding to FIG. 1 immediately after the overcurrent has been triggered before the latch lever is returned to its normal position (FIGS. 1, 4, 6),
  • Figur 4 einen Längsschnitt entsprechend Fig. 1 und 3 durch den Schalter nach erfolgter Überstromauslösung und bei einer nach dem Erkalten des Bimetalls vorliegenden Endstellung des Schaltschlosses,4 shows a longitudinal section corresponding to FIGS. 1 and 3 through the switch after overcurrent tripping and when the switch lock has reached its final position after the bimetal has cooled,
  • Figur 5 eine die wesentlichen Funktionsteile der Schalterstellung gemäß Fig. 4 zeigende Prinzipdarstellung analog Fig. 2,FIG. 5 shows a basic illustration analogous to FIG. 2, showing the essential functional parts of the switch position according to FIG. 4,
  • Figur 6 einen Längsschnitt entsprechend Fig. 1, 3 und 4 in Hand-Ausschaltstellung. Diese Stellung ist identisch mit derjenigen Stellung, die der Schalter nach vollständig abgeschlossener Überstromauslösung und in die Aus-Stellung überführtem Kipphebel einnimmt, wobei die Überführung des Kipphebels in seine Ausschaltstellung das Spannen des Schaltschlosses gegen den Druck der Kontaktfeder bewirkt hat.6 shows a longitudinal section corresponding to FIGS. 1, 3 and 4 in the manual switch-off position. This position is identical to the position which the switch assumes after the overcurrent release has been completed and the rocker arm has been moved to the off position, the shifting of the rocker arm into its switched-off position causing the switching lock to be tensioned against the pressure of the contact spring.
  • Figur 7 eine Prinzipdarstellung der für die Schalterstellung gemäß Fig. 6 funktionswesentlichen Teile,FIG. 7 shows a basic illustration of the parts that are essential for the function of the switch according to FIG. 6,
  • Figur 8 eine Draufsicht entsprechend Pfeil VIII in Fig. 1 auf die wesentlichen, das Schaltschloß bildenden Teile,8 shows a plan view according to arrow VIII in FIG. 1 of the essential parts forming the switching lock,
  • Figur 9 eine Prinzipdarstellung der .funktionswesentlichen Teile eines Überstromschalters mit Kontaktbrückenlagerung am kontaktfernen Ende in Einschaltstellung,FIG. 9 shows a schematic diagram of the essential parts of an overcurrent switch with contact bridge mounting at the end remote from the contact in the switched-on position,
  • Figur 10 eine Prinzipdarstellung gemäß Fig. 9 in Ausschaltstellung,FIG. 10 shows a basic illustration according to FIG. 9 in the switched-off position,
  • Figur 11 eine Prinzipdarstellung gemäß Fig. 9 und 10 in Auslösestellung (Entklinkungsstellung),FIG. 11 shows a basic illustration according to FIGS. 9 and 10 in the release position (unlatching position),
  • Figur 12 eine Prinzipdarstellung gemäß Fig. 9 bis 11, die das Spannen in den Ausschaltzustand bei gleichzeitiger Verklinkung des Klinkenhebels zeigt,FIG. 12 shows a basic illustration according to FIGS. 9 to 11, which shows the tensioning in the switched-off state with simultaneous latching of the latch lever,
  • Figur 13 einen Schnitt durch die Führungsmittel am kontaktfernen Ende der Schalterausführung gemäß Fig. 9 bis 12,FIG. 13 shows a section through the guide means at the end of the switch design according to FIGS. 9 to 12 remote from the contact,
  • Figur 14 einen Schnitt durch die Verklinkungs- und Führungsmittel einer weiteren Ausführungsform des Schalters.14 shows a section through the latching and guiding means of a further embodiment of the switch.

Der folgende Text betrifft das erste Ausführungsbeispiel gemäß Fig. 1 bis 8.The following text relates to the first exemplary embodiment according to FIGS. 1 to 8.

Der Überstromschutzschalter enthält im Schaltergehäuse 1 die Kontaktfeder 2, die mit dem Festkontakt 3 zusammenwirkende Kontaktbrücke 4, den Kontaktbrückenhalter 5, den Klinkenhebel 6, das streifenförmige Bimetall 7 sowie den am Schaltergehäuse 1 drehbar gelagerten Kipphebel 8. Der Stromdurchgang durch den Schalter zwischen den beiden Anschlußklemmen 9, 10 erfolgt über das Bimetall 7, das Verbindungskabel 12, die Kontaktschiene 11, das Verbindungskabel 12a, die Kontaktbrücke 4 und den Festkontakt 3, der seinerseits über die Schmelzsicherung 26 mit ihren beiden Anschlußkontakten 27, 28 und die Schiene 25 mit der Anschlußklemme 10 in elektrisch leitender Verbindung steht.The overcurrent protection switch contains in the switch housing 1 the contact spring 2, the contact bridge 4 interacting with the fixed contact 3, the contact bridge holder 5, the latch lever 6, the strip-shaped bimetal 7 and the rocker arm 8 rotatably mounted on the switch housing 1. The passage of current through the switch between the two connection terminals 9, 10 takes place via the bimetal 7, the connecting cable 12, the contact rail 11, the connecting cable 12a, the contact bridge 4 and the fixed contact 3, which in turn via the fuse 26 with its two connecting contacts 27, 28 and the rail 25 with the connecting terminal 10 is in an electrically conductive connection.

Die Kontaktbrücke 4 ist als zweiarmiger Hebel ausgebildet. Sie weist dadurch den kontaktnahen Kontaktarm 13 und den kontaktfernen Haltearm 14 auf. Das Kontaktbrückenlager ist mit 15 gekennzeichnet.The contact bridge 4 is designed as a two-armed lever. As a result, it has the contact arm 13 close to the contact and the holding arm 14 remote from the contact. The contact bridge bearing is marked with 15.

Der kontaktferne Haltearm 14 der Kontaktbrücke 4 ist von der Kontaktfeder 2 in Kontaktöffnungsrichtung beaufschlagt. Die Kontaktfeder 2 ist eine Zugfeder, deren kontaktfernes Ende 16 in der Nähe des Kipphebels 8 am Schaltergehäuse 1 befestigt ist. Durch die Kontaktfeder 2 wird die Kontaktbrücke 4 mit dem Ende ihres Haltearmes 14 gegen einen Schwenkbegrenzungsanschlag 17 gezogen, welcher drehbar um eine zur Schalterlängsebene senkrechte Achse am Klinkenhebel 6 gelagert ist.The non-contact holding arm 14 of the contact bridge 4 is acted upon by the contact spring 2 in the contact opening direction. The contact spring 2 is a tension spring whose distal end 16 is fastened to the switch housing 1 in the vicinity of the rocker arm 8. Through the contact spring 2, the contact bridge 4 is pulled with the end of its holding arm 14 against a swivel limiting stop 17 which is rotatably mounted on the latch lever 6 about an axis perpendicular to the longitudinal plane of the switch.

Der Klinkenhebel 6 ist im Bereich seines Lagerendes 18 in der Schalterebene um die Achse 19 schwenkbar am Schaltergehäuse 1 gelagert. Die Achse 19 liegt zwischen Kontaktbrücke 4 und Kipphebel 8. Das Schwenkende 20 des Klinkenhebels 6 ist durch das Bimetall 7 aus seiner in Fig. 1, 2 und 4 ff. dargestellten Normalstellung in die in Fig. 3 dargestellte Ausschwenkstellung auslenkbar. Der Klinkenhebel 6 enthält neben dem Schwenkbegrenzungsanschlag 17 für den Haltearm 14 der Kontaktbrücke 4 noch einen in den Weg der weiteren Kontaktöffnung in Kontaktöffnungsrichtung 21 des Haltearmes 14 der Kontaktbrücke 4 hineinstehenden Festanschlag 22. Der Kontaktbrückenhalter 5 ist mit seinem dem Kontaktbrückenlager 15 abgewandten Ende in der Schalterebene schwenkbar am Schaltergehäuse 1 gelagert und durch einen gegen die Zugrichtung der Kontaktfeder 2 wirksamen, vom Kipphebel 8 über einen Totpunkt mit anschließend automatischem Bewegungsablauf überführbaren Druckstößel 23 beaufschlagt.The pawl lever 6 is mounted on the switch housing 1 in the area of its bearing end 18 in the switch plane about the axis 19. The axis 19 lies between the contact bridge 4 and the rocker arm 8. The pivoting end 20 of the latch lever 6 can be deflected by the bimetal 7 from its normal position shown in FIGS. 1, 2 and 4 ff. Into the pivoted position shown in FIG. 3. In addition to the pivot limiting stop 17 for the holding arm 14 of the contact bridge 4, the pawl lever 6 also contains a fixed stop protruding into the path of the further contact opening in the contact opening direction 21 of the holding arm 14 of the contact bridge 4 22. The contact bridge holder 5 is pivotally mounted on the switch housing 1 with its end facing away from the contact bridge bearing 15 and is acted upon by a pressure plunger 23 which is effective against the pulling direction of the contact spring 2 and can be transferred from the rocker arm 8 via a dead center with a subsequent automatic movement sequence.

Die Kontaktbrücke 4, genauer gesagt deren Kontaktarm 13, und der Kontaktbrückenhalter 5 sind nach Art der Lenker eines Kniehebels miteinander verbunden, dessen durch das Kontaktbrückenlager 15 gebildete Kniegelenk durch den Druckstößel 23 in seine Streckstellung (Fig. 7) und durch die Kontaktfeder 2 aus der Streckstellung in seine Knickstellung (Fig. 5) überführbar ist. Die Lagerachse 29 des Kontaktbrückenhalters 5 überdeckt sich etwa mit der Drehachse 24 des Schwenkbegrenzungsanschlages 17. In miteinander verriegelter Stellung (Fig. 1, 2, 6, 7) verläuft der seinerseits etwa parallel zum Bimetall 7 ausgerichtete Klinkenhebei 6 etwa rechtwinklig zur Längsrichtung der Kontaktbrücke 4 bzw. zum Kontaktbrückenhalter 5.The contact bridge 4, more precisely the contact arm 13, and the contact bridge holder 5 are connected to one another in the manner of the handlebars of a toggle lever, the knee joint formed by the contact bridge bearing 15 through the pressure plunger 23 into its extended position (FIG. 7) and through the contact spring 2 from the The stretched position can be converted into its kinked position (FIG. 5). The bearing axis 29 of the contact bridge holder 5 overlaps approximately with the axis of rotation 24 of the swiveling limit stop 17. In the locked position (FIGS. 1, 2, 6, 7), the jack lever 6, which in turn is approximately parallel to the bimetal 7, extends approximately at right angles to the longitudinal direction of the contact bridge 4 or to the contact bridge holder 5.

Die Achse 19 des Klinkenhebels 6 ist an dessen dem Kipphebel 8 zugewandten Ende angeordnet. Die Lagerachse 29 des Kontaktbrückenhalters 5 liegt zwischen Achse 19 und Schwenkende 20 des Klinkenhebels 6. Der Schwenkbegrenzungsanschlag 17 ist nur in Kontaktöffnungsrichtung 21 gegen den Haltearm 14 der Kontaktbrücke 4 wirksam und begrenzt dabei deren Schwenkweg in Kontaktöffnungsrichtung 21. Der Schwenkbegrenzungsanschlag 17 ist aus seiner Schwenkbegrenzungsstellung wegschwenkbar am Klinkenhebel 6 gelagert und durch eine ihn in seine Schwenkbegrenzungsstellung zurückdrehende Rückstellfeder 30 derart beaufschlagt, daß er bei in Normalstellung befindlichem Klinkenhebei 6 als Stop in den Schwenkweg des in Kontaktöffnungsrichtung 21 geschwenkten Haltearmes 14 der Kontaktbrücke 4 hineinsteht und bei Rückschwenkung der Kontaktbrücke 4 aus deren Anlage am Festanschlag 22 vom Haltearm 14 aus seiner Stopstellung ausgelenkt wird.The axis 19 of the pawl lever 6 is arranged at its end facing the rocker arm 8. The bearing axis 29 of the contact bridge holder 5 lies between the axis 19 and the pivot end 20 of the latch lever 6. The pivot limiting stop 17 is only effective in the contact opening direction 21 against the holding arm 14 of the contact bridge 4 and thereby limits its pivoting path in the contact opening direction 21. The pivot limiting stop 17 can be pivoted away from its pivot limiting position mounted on the pawl lever 6 and acted upon by a return spring 30 turning it back into its swivel limiting position in such a way that, when the pawl lever 6 is in the normal position, it stands as a stop in the swivel path of the holding arm 14 of the contact bridge 4 pivoted in the contact opening direction 21 and when the contact bridge 4 swings back out of its system is deflected from the stop position on the fixed stop 22 by the holding arm 14.

In Kontaktöffnungsstellung (Fig. 3, 4, 6) liegt das Ende 31 des Kontaktarmes 13 der Kontaktbrücke 4 gegen den gehäusefesten Anschlag 32 an, der insbesondere mit der insgesamt mit 33 bezeichneten Löschkammer in kontakmäßiger Verbindung steht. Das Schwenkende 20 des Klinkenhebels 6 ist in Entriegelungsrichtung 34 von der Entriegelungsfeder 35 gegen den Verriegelungsanschlag 36 beaufschlagt, der seinerseits durch die Auslenkung des Bimetalls 7 aus seiner Wirkstellung um eine lotrecht zur Mittellängsrichtung des Schaltergehäuses 1 verlaufende Achse schwenkbar ist. Der Verriegelungsanschlag 36 steht dabei unter dem Druck einer nicht dargestellten, in der Bimetallschwenkung entgegengerichteten Pfeilrichtung 37 wirksamen Rückstellfeder. Das Bimetall 7 verläuft etwa parallel zum Klinkenhebel 6 neben diesem. Sein etwa neben dem Schwenkende 20 des Klinkenhebels 6 liegendes Auslenkende 38 beaufschlagt bei seiner Auslenkung den Arm 39 des am Schaltergehäuse 1 in der Schalterebene schwenkbar gelagerten Winkelhebels 40, dessen anderer Arm 41 den Verriegelungsanschlag 36 in dessen der Pfeilrichtung 37 seiner Federbeaufschlagung entgegengerichteten Entriegelungsrichtung beaufschlagt, wobei der Verriegelungsanschlag bei Erreichung seiner Entriegelungsstellung (Fig. 3) das unter dem Druck der Entriegelungsfeder 35 in Entriegelungsrichtung 34 erfolgende Ausschwenken des Klinkenhebels 6 freigibt. In seiner Entriegelungsstellung kommt das Schwenkende 20 des Klinkenhebels 6 in Überdeckung mit der V-förmigen, kreissektorartigen Ausnehmung 42 des Verriegelungsanschlages 36 und taucht in diese Ausnehmung 42 ein.In the contact opening position (FIGS. 3, 4, 6), the end 31 of the contact arm 13 of the contact bridge 4 bears against the stop 32 which is fixed to the housing and which is in particular in contact with the extinguishing chamber designated as a whole by 33. The pivoting end 20 of the pawl lever 6 is acted upon in the unlocking direction 34 by the unlocking spring 35 against the locking stop 36, which in turn can be pivoted about an axis running perpendicular to the central longitudinal direction of the switch housing 1 by the deflection of the bimetal 7 from its operative position. The locking stop 36 is under the pressure of a return spring (not shown) which is effective in the direction of the arrow 37 in the direction of the bimetallic pivoting. The bimetal 7 runs approximately parallel to the ratchet lever 6 next to this. Its deflecting end 38, which lies approximately next to the pivoting end 20 of the ratchet lever 6, acts upon the arm 39 of the angle lever 40 pivotably mounted on the switch housing 1 in the switch plane, the other arm 41 of which acts on the locking stop 36 in the unlocking direction opposite to the direction of the arrow 37 of its spring action, whereby the locking stop on reaching its unlocking position (FIG. 3) releases the pivoting of the latch lever 6 taking place under the pressure of the unlocking spring 35 in the unlocking direction 34. In its unlocked position, the pivoting end 20 of the latch lever 6 overlaps the V-shaped, sector-shaped recess 42 of the locking stop 36 and plunges into this recess 42.

Der Druckstößel 23 ist zwischen zwei Schwenkendstellungen (Fig. 1, 4 einerseits und Fig. 6 andererseits) in der Schalterebene schwenkbar am Ende 43 eines am Schaltergehäuse 1 schwenkbar gelagerten Schaltlenkers angelenkt. Die beiden Schwenkendstellungen liegen beiderseits einer dem Kontaktbrückenhalter 5 nächsten Totpunktstellung. Der Schaltlenker ist als um die Achse 44 drehbar gelagerte Scheibe 45 ausgebildet, die an ihrem Umfang (Ende 43) den Druckstößel 23 mit seinem kipphebelseitigen Ende 46 drehbar lagert. Auf dem Umfang der Scheibe 45 ist der Kipphebel 8 um die Achse 44 schwenkbar gelagert. Der durch die Scheibe 45 gebildete Schaltlenker ist jeweils durch Betätigung des Kipphebels 8 über seine untere Totpunktstellung hinüberführbar, wonach er unter dem Druck der Kontaktfeder 2 selbsttätig in seine jeweilige Schwenkendstellung (Fig. 1, 4 einerseits und Fig. 6 andererseits) durchschwenkt. Die die Scheibe 45 umgebende Lagerhülse 47 des Kipphebels 8 ist im Bereich der Anlenkung des Schaltlenkers (Scheibe 45) mit einem Ausschnitt 58 versehen, dessen in Umfangsrichtung weisende Länge dem Schwenkweg des Schaltlenkerlagers (Ende 46 des Druckstößels 23) zwischen dessen Totpunktstellung und dessen Schwenkendstellungen etwa entspricht. Der Druckstößel 23 verläuft etwa parallel zum Klinkenhebel 6 und liegt mit seinem Freiende 48 an der Oberkante 49 des Kontaktbrückenhalters 5 an. Das Freiende 48 des Druckstößels 23 ist als Abwälzbahn abgerundet ausgebildet. Es liegt im Zwischenraum zwischen dem Lagerende 18 des Klinkenhebels 6 und der die Schmelzsicherung 26 flankierenden Gehäusewand 50 mit lateraler Beweglichkeit ein.The plunger 23 is articulated between two pivot end positions (FIGS. 1, 4 on the one hand and FIG. 6 on the other hand) in the switch plane at the end 43 of a control arm pivotally mounted on the switch housing 1. The two pivot end positions are on either side of a dead center position closest to the contact bridge holder 5. The control arm is designed as a disk 45 rotatably mounted about the axis 44, which rotatably supports the pressure plunger 23 with its rocker arm-side end 46 on its periphery (end 43). On the circumference of the disc 45, the rocker arm 8 is pivotally mounted about the axis 44. The control arm formed by the disc 45 can be moved over its bottom dead center position by actuating the rocker arm 8, after which it automatically swivels under the pressure of the contact spring 2 into its respective pivot end position (FIGS. 1, 4 on the one hand and FIG. 6 on the other hand). The bearing sleeve 47 of the rocker arm 8 surrounding the disc 45 is provided in the region of the articulation of the control arm (disc 45) with a cutout 58, the length of which points in the circumferential direction approximately the pivoting path of the control arm bearing (end 46 of the pressure tappet 23) between its dead center position and its pivoting end positions corresponds. The pressure plunger 23 runs approximately parallel to the ratchet lever 6 and rests with its free end 48 on the upper edge 49 of the contact bridge holder 5. The free end 48 of the pressure ram 23 is rounded off as a rolling track. It lies in the space between the bearing end 18 of the latch lever 6 and the housing wall 50 flanking the fuse 26 with lateral mobility.

Der Kontaktbrückenträger 5 enthält zwei in der Schalterebene parallel zueinander verlaufende Wangen 51, die miteinander fest verbunden sind und zwischen denen die Kontaktbrücke 4 angeordnet ist. Auch der Klinkenhebel 6 ist zwischen den Wangen 51 angeordnet. Die Lagerachse der Kontaktbrücke 4 ist durch beidseitig an die Kontaktbrücke 4 angeformte Zapfen 52 gebildet, die in in die Wangen 51 eingebrachten Lageraugen 53 einliegen. Die Kontaktbrücke 4 ist durch ein Metallstanzteil gebildet. Die Zapfen 52 bestehen aus lateral aus der Kontaktbrücke 4 vorstehenden, mit der Kontaktbrücke 4 einstückigen Blechlappen. Die Lageraugen 53 weisen kontaktfederseitig als Gegenlager für die Schwenkbewegung der Kontaktbrücke 4 jeweils eine konvexe Seitenwand 54 auf. Der Klinkenhebel 6 ist ein im Querschnitt U-förmig gebogenes Blechteil, zwischen dessen U-Stege der Haltearm 14 der Kontaktbrücke 4 hineinsteht.The contact bridge support 5 contains two cheeks 51 running parallel to one another in the switch plane, which are firmly connected to one another and between which the contact bridge 4 is arranged. The latch lever 6 is also arranged between the cheeks 51. The bearing axis of the contact bridge 4 is formed by pins 52 formed on both sides of the contact bridge 4 and which lie in bearing eyes 53 inserted into the cheeks 51. The contact bridge 4 is formed by a metal stamped part. The pins 52 are made from laterally protruding from the contact bridge 4, with the contact bridge 4 integral tabs. The bearing eyes 53 each have a convex side wall 54 on the contact spring side as a counter bearing for the pivoting movement of the contact bridge 4. The pawl lever 6 is a sheet metal part bent in a U-shaped cross section, between the U-webs of which the holding arm 14 of the contact bridge 4 projects.

Der Schwenkbegrenzungsanschlag 17 ist als in den Wangen 61 des Klinkenhebels 6 drehbar gelagerte Welle ausgebildet, deren Querschnitt im zwischen den U-Schenkeln liegenden Anschlagbereich etwa halbkreisförmig ausgestaltet ist. Dabei liegt in Schwenkbegrenzungsstellung des Schwenkbegrenzungsanschlages 17 der Haltearm 14 der Kontaktbrücke 4 mit seinem Ende am in den Schwenkweg stehenden, dem Halbkreisdurchmesser 55 benachbarten unteren Umfangsbereich 56 des Halbkreisquerschnittes des Schwenkbegrenzungsanschlages 17 an, der durch Drehung der Welle oder Wegschwenkung des Klinkenhebels 6 aus seiner Beaufschlagung durch den Haltearm 14 herausführbar ist. Das Bimetall 7 bzw. der Verriegelungsanschlag 36 kann in bekannter Weise auch durch eine insgesamt mit 57 bezeichnete Magnetauslöseeinrichtung auslenkbar sein.The pivot limiting stop 17 is designed as a shaft rotatably mounted in the cheeks 61 of the ratchet lever 6, the cross-section of which is approximately semicircular in the stop region lying between the U-legs. In the pivoting limit position of the pivoting limit stop 17, the holding arm 14 of the contact bridge 4 rests with its end on the lower circumferential region 56 of the semicircular cross section of the pivoting limit stop 17 that is adjacent to the semicircular diameter 55 and which is caused by its rotation by rotating the shaft or pivoting away the pawl lever 6 the holding arm 14 can be brought out. The bimetal 7 or the locking stop 36 can also be deflected in a known manner by means of a magnetic release device designated overall by 57.

Bei einer Überstromauslösung des in Einschaltstellung (Fig. 1) befindlichen Schalters wird das Auslenkende 38 des Bimetalls 7 durch dessen Erhitzung oder durch die Magnetauslöseeinrichtung 57 um sein oberes Einspannende entgegen dem Uhrzeigersinn ausgeschwenkt. Dabei schlägt das Auslenkende 38 gegen den Arm 39 des Winkelhebels 40 und schwenkt den Winkelhebel 40 im Uhrzeigersinn um dessen Achse. Der andere Arm 41 des Winkelhebels 40 dreht infolgedessen den Verriegelungsanschlag 36 entgegen dem Uhrzeigersinn. Dabei kommt dessen Ausnehmung 42 in Überdeckung mit dem Schwenkende 20 des Klinkenhebels 6. Die Entriegelungsfeder 35 drückt das Schwenkende 20 des Klinkenhebels 6 in die Ausnehmung 42, wodurch der Klinkenhebel 6 entgegen dem Uhrzeigersinn um seine Achse 19 schwenkt.In the event of an overcurrent release of the switch in the switched-on position (FIG. 1), the deflecting end 38 of the bimetal 7 is pivoted counterclockwise by its heating or by the magnetic release device 57 around its upper clamping end. The deflecting end 38 strikes against the arm 39 of the angle lever 40 and pivots the angle lever 40 clockwise about its axis. As a result, the other arm 41 of the angle lever 40 rotates the locking stop 36 counterclockwise. The recess 42 comes into overlap with the pivoting end 20 of the ratchet lever 6. The unlocking spring 35 presses the pivoting end 20 of the ratchet lever 6 into the recess 42, whereby the ratchet lever 6 pivots counterclockwise about its axis 19.

Während in Einschaltstellung das Ende des Haltearmes 14 der Kontaktbrücke 4 unter dem Zug der Kontaktfeder 2 gegen den Schwenkbegrenzungsanschlag 17 bzw. dessen Umfangsbereich 56 anliegt und an einem Ausschwenken in Kontaktöffnungsrichtung 21 gehindert wird, gibt die Schwenkung des Klinkenhebels 6 mit seinem Schwenkende 20 in die Ausnehmung 42 des Verriegelungsanschlages 36 den Haltearm 14 der Kontaktbrücke 4 frei. Der Haltearm 14 der Kontaktbrücke 4 schnellt entgegen dem Uhrzeigersinn um die Achse des Kontaktbrückenlagers 15 und reißt dadurch den Kontakt zwischen dem Kontaktarm 13 der Kontaktbrücke 4 und dem Festkontakt 3 des Schalters auf. Der Kontaktarm 13 der Kontaktbrücke 4 legt sich mit seinem Ende 31 gegen den Anschlag 32 des Schaltergehäuses 1 an. Im weiteren Verlauf der Schwenkbewegung der Kontaktbrücke 4 in Kontaktöffnungsrichtung 21 schlägt deren Haltearm 14 an den Festanschlag 22 des Klinkenhebels 6 an.While in the switched-on position the end of the holding arm 14 of the contact bridge 4 bears against the swivel limiting stop 17 or its circumferential region 56 under the tension of the contact spring 2 and is prevented from swiveling out in the contact opening direction 21, the pivoting of the latch lever 6 with its swiveling end 20 results in the recess 42 of the locking stop 36 releases the holding arm 14 of the contact bridge 4. The holding arm 14 of the contact bridge 4 swings counterclockwise around the axis of the contact bridge bearing 15 and thereby breaks the contact between the contact arm 13 of the contact bridge 4 and the fixed contact 3 of the switch. The contact arm 13 of the contact bridge 4 rests with its end 31 against the stop 32 of the switch housing 1. In the further course of the pivoting movement of the contact bridge 4 in the contact opening direction 21, its holding arm 14 strikes the fixed stop 22 of the latch lever 6.

Das von der Kontaktfeder 2 über die Anlage des Haltearmes 14 am Festanschlag 22 auf den Klinkenhebel 6 ausgeübte, um dessen Achse 19 wirksame Drehmoment ist größer als das von der Entriegelungsfeder 35 ebenfalls auf den Klinkenhebel 6, jedoch in entgegengesetzter Richtung ausgeübte Drehmoment. Folglich wird der Klinkenhebel 6 unter Kompression der Entriegelungsfeder 35 durch die über den Festanschlag 22 wirksame Kontaktfeder 2 selbsttätig wieder in seine im wesentlichen vertikale Ausgangslage (Fig. 4, 6) zurückgeschwenkt.The force exerted by the contact spring 2 via the contact of the holding arm 14 on the fixed stop 22 on the pawl lever 6, about its axis 19 effective torque is greater than the torque exerted by the unlocking spring 35 also on the pawl lever 6, but in the opposite direction. As a result, the pawl lever 6 is automatically pivoted back into its essentially vertical starting position (FIGS. 4, 6) by compression of the unlocking spring 35 by the contact spring 2 acting via the fixed stop 22.

Kehrt das Bimetall z. B. durch Erkalten in seine vertikale Ausgangsstellung (Fig. 4) zurück, so schwenkt der Verriegelungsanschlag 36 unter dem Einfluß der ihn beaufschlagenden Rückstellfeder in Pfeilrichtung 37 in gleichem Maße in seine Ausgangsstellung (Fig. 1, 4 und 6) zurück. Dadurch gerät die Ausnehmung 42 des Verriegelungsanschlages 36 außer Überdeckung mit dem Schwenkweg des Schwenkendes 20 des Klinkenhebels 6 mit der Folge, daß nunmehr bei einem Nachlassen der auf den Haltearm 14 der Kontaktbrücke einwirkenden Zugkraft seitens der Kontaktfeder 2 der Klinkenhebel 6 nicht mehr unter dem dann dominierenden Druck der Entriegelungsfeder 35 entgegen dem Uhrzeigersinn wieder in die in Fig. 3 dargestellte Auslenkstellung ausschwenken kann.Returns the bimetal z. B. by cooling back into its vertical starting position (Fig. 4), the locking stop 36 pivots under the influence of the return spring acting on it in the direction of arrow 37 to the same extent in its starting position (Fig. 1, 4 and 6). As a result, the recess 42 of the locking stop 36 overlaps with the pivot path of the pivot end 20 of the ratchet lever 6 with the result that now when the tensile force acting on the holding arm 14 of the contact bridge decreases on the part of the contact spring 2 the ratchet lever 6 no longer under the then dominant Pressure of the unlocking spring 35 can pivot counterclockwise back into the deflection position shown in FIG. 3.

Während der vorstehend beschriebenen Bewegungsvorgänge innerhalb des Schalters wurde der Kipphebel 8 nicht betätigt. Der Schalter nimmt die in Fig. 4 dargestellte End-Ausschaltstellung ein. Um eine Wiedereinschaltung vornehmen zu können, muß zunächst der Kipphebel 8 im Uhrzeigersinn um die Achse 44 geschwenkt werden. Dabei drückt die Lagerhülse 47 des Kipphebels 8 mit ihrer den Ausschnitt 58 begrenzenden Vorderkante 59 das Ende 46 des Druckstößels 23 vor sich her. Mit derselben Bewegung wird die Scheibe 45 gedreht. Dies bedeutet, daß der durch die Scheibe 45 und den Druckstößel 23 gebildete Kniehebel in seine Streckstellung durchgedrückt wird. Mit diesem Überführen des gebildeten Kniehebels in seine Streckstellung drückt der Druckstößel 23 mit seinem Freiende 48 die Oberkante 49 des Kontaktbrückenhalters 5 nach unten. Dieser schwenkt dabei entgegen dem Uhrzeigersinn um seine Lagerachse 29 und bewegt dabei das Kontaktbrückenlager 15 nach unten.The rocker arm 8 was not actuated during the above-described movements within the switch. The switch assumes the limit switch position shown in FIG. 4. In order to be able to restart, the rocker arm 8 must first be pivoted clockwise about the axis 44. The bearing sleeve 47 of the rocker arm 8 presses the end 46 of the pressure ram 23 in front of it with its front edge 59 which delimits the cutout 58. The disk 45 is rotated with the same movement. This means that the toggle lever formed by the disk 45 and the pressure tappet 23 is pushed into its extended position. With this transfer of the toggle lever formed into its extended position, the pressure ram 23 presses with its free end 48 the upper edge 49 of the contact bridge holder 5 downward. This pivots counterclockwise about its bearing axis 29 and moves the contact bridge bearing 15 downward.

Wegen des Anliegens des Kontaktarmes 13 mit seinem Ende 31 an dem gehäusefesten Anschlag 32 bewirkt die Bewegung des Kontaktbrückenlagers 15 nach unten eine Schwenkung des Haltearmes 14 der Kontaktbrücke 4 im Uhrzeigersinn, d. h. eine Streckung auch des durch den Kontaktarm 13 der Kontaktbrücke 4 und den Kontaktbrückenhalter 5 gebildeten Kniehebels. Das Ende des Haltearmes 14 der Kontaktbrücke 4 gerät dabei außer Kontakt mit dem Festanschlag 22 des Kipphebels 6 und schlägt bei weiterer Schwenkung im Uhrzeigersinn gegen die dem Halbkreisdurchmesser 55 entsprechende Fläche des Schwenkbegrenzungsanschlages 17. Diese setzt der Weiterschwenkung des Haltearmes 14 der Kontaktbrücke im Uhrzeigersinn keinen Widerstand entgegen, weil der Schwenkbegrenzungsanschlag 17 gegen die von der Rückstellfeder 30 ausgehende Rückstellkraft entgegen dem Uhrzeigersinn ausschwenkt.Because of the contact of the contact arm 13 with its end 31 against the stop 32 fixed to the housing, the movement of the contact bridge bearing 15 downwards causes the holding arm 14 of the contact bridge 4 to pivot clockwise, ie an extension of that through the contact arm 13 of the contact bridge 4 and the contact bridge holder 5 formed toggle. The end of the holding arm 14 of the contact bridge 4 comes out of contact with the fixed stop 22 of the rocker arm 6 and strikes with a further clockwise rotation against the Semicircular diameter 55 corresponding area of the pivot limit stop 17. This does not oppose the further pivoting of the holding arm 14 of the contact bridge in the clockwise direction, because the pivot limit stop 17 swings counterclockwise against the restoring force emanating from the return spring 30.

Das Ende des Haltearmes 14 der Kontaktfeder streicht am Halbkreisdurchmesser 55 des Schwenkbegrenzungsanschlages 17 vorbei. Sobald der Haltearm 14 den Schwenkbegrenzungsanschlag 17 passiert hat, wird dieser unter der von der Rückstellfeder 30 ausgehenden Rückstellkraft. im Urzeigersinn in seine in den Figuren dargestellte Ausgangsstellung zurückgeschwenkt. Durchläuft der durch die Scheibe 45 und den Druckstößel 23 gebildete Kniehebel seine Streck- bzw. Totpunktstellung durch Weiterschwenken des Kipphebels 8, so hat die Spannung der Kontaktfeder 2 ihr Maximum erreicht. Sobald die vorgenannte Streck- bzw. Totpunktstellung überschritten ist, wird der von der Kontaktfeder 2 ausgeübte Druck voll im Sinne eines Wiedereinknickens des Kniegelenkes des durch Scheibe 45 und Druckstößel 23 gebildeten Kniehebels wirksam. Die Scheibe 45 schwenkt im Uhrzeigersinn ungehindert durch den freien Raum des Ausschnittes 58 der Lagerhülse 47 des Kipphebels 8 durch, bis der Druckstößel 23 lateral an die Gehäusewand 50 anstößt und damit dem Weiterschwenken der Scheibe 45 ein Ende setzt. Der Druckstößel 23 nimmt dann die aus Fig. 6 ersichtliche Stellung ein, gleichgültig ob sich der Kipphebel 8 bereits in seiner ausgeschwenkten, in Fig. 6 dargestellten Endstellung befindet oder in derjenigen Zwischenstellung festgehalten wird, in der der durch die Scheibe 45 und den Druckstößel 23 gebildete Kniehebel durch seine Streck- bzw. Totpunktstellung hindurchgedrückt worden ist. Die schlagartige, handunabhängige Überführung des aus Druckstößel 23 und Scheibe 45 gebildeten Kniehebels aus der Streck- in die aus Fig. 6 ersichtliche Knickstellung beruht darauf, daß nach dem Durchlaufen der Streck- oder Totpunktstellung der Druckstößel 23 keinen Druck mehr auf die Oberkante 49 des Kontaktbrückenhalters 5 ausübt. Die Kontaktfeder 2 entspannt sich folglich und zieht dabei den Haltearm 14 der Kontaktfeder 4 gegen den Schwenkbegrenzungsanschlag 17, der durch seine Rückstellfeder 30 in den Schwenkweg des Haltearmes 14 hineingeschwenkt worden ist mit der Folge, daß die weitere Schwenkung der Kontaktbrücke 4 gegenüber dem Kontaktbrückenhalter 5 gesperrt ist. Durch den Anschlag des Haltearmes 14 an den Schwenkbegrenzungsanschlag 17 ist auch eine weitere Entspannung der Kontaktfeder 2 nicht mehr möglich. Der Schalter befindet sich in seiner Einschaltbereitstellung (Fig. 6).The end of the holding arm 14 of the contact spring sweeps past the semicircular diameter 55 of the swivel limiting stop 17. As soon as the holding arm 14 has passed the swivel limit stop 17, it becomes under the restoring force emanating from the restoring spring 30. pivoted back clockwise into its initial position shown in the figures. If the toggle lever formed by the disk 45 and the pressure tappet 23 passes through its extended or dead center position by pivoting the rocker arm 8 further, the tension of the contact spring 2 has reached its maximum. As soon as the aforementioned stretching or dead center position has been exceeded, the pressure exerted by the contact spring 2 becomes fully effective in the sense of the knee joint of the toggle lever formed by the disk 45 and the pressure plunger 23 being bent again. The disc 45 pivots clockwise through the free space of the cutout 58 of the bearing sleeve 47 of the rocker arm 8 until the plunger 23 laterally abuts the housing wall 50 and thus puts an end to the pivoting of the disc 45. The pressure tappet 23 then assumes the position shown in FIG. 6, irrespective of whether the rocker arm 8 is already in its swung-out end position shown in FIG. 6 or is held in the intermediate position in which it is held by the disk 45 and the pressure tappet 23 formed toggle lever has been pushed through its extension or dead center position. The sudden, hand-independent transfer of the toggle lever formed from the pressure tappet 23 and the washer 45 from the stretching position into the kink position shown in FIG. 6 is based on the fact that after passing through the stretching or dead center position of the pressure tappet 23, there is no more pressure on the upper edge 49 of the contact bridge holder 5 exercises. The contact spring 2 consequently relaxes and pulls the holding arm 14 of the contact spring 4 against the pivot limiting stop 17, which has been pivoted into the pivoting path of the holding arm 14 by its return spring 30, with the result that the further pivoting of the contact bridge 4 relative to the contact bridge holder 5 is blocked is. Due to the stop of the holding arm 14 on the swivel limit stop 17, further relaxation of the contact spring 2 is no longer possible. The switch is in the switch-on position (FIG. 6).

Zum Wiedereinschalten des Schalters, d. h. zu seiner Überführung aus der in Fig. 6 dargestellten Einschaltbereitstellung in seine in Fig. 1 dargestellte Einschaltstellung wird der Kipphebel 8 entgegen dem Uhrzeigersinn geschwenkt. Die bei dieser Schwenkbewegung nach vorn bewegte Rückkante 60 der Lagerhülse 47 drückt das Ende 46 des Druckstößels 23 vor sich her. Der durch Scheibe 45 und Druckstößel 23 gebildete Kniehebel wird durch seine Streck- oder Totpunktstellung wieder hindurchgedrückt, wobei sich das Ende des Haltearms 14 der Kontaktbrücke 4 von der Anlage am Schwenkbegrenzungsanschlag 17 löst, indem die Kontaktbrücke 4 im Uhrzeigersinn leicht gegenüber dem Kontaktbrückenhalter 5 geschwenkt, d. h. der durch beide Teile gebildete Kniehebel leicht eingeknickt wird. Die Kontaktfeder 2 wird weiter gespannt. Sobald die Streck- oder Totpunktstellung des durch Scheibe 45 und Druckstößel 23 gebildeten Kniehebels durchlaufen ist, entfällt der vom Druckstößel 23 auf den Kontaktbrückenhalter 5 ausgeübte Druck. Der Druck der Kontaktfeder 2 wird voll wirksam. Diese reißt zunächst den Haltearm 14 der Kontaktbrücke 4 gegen den Schwenkbegrenzungsanschlag 17 und schwenkt dann die Kontaktbrücke 4 gemeinsam mit dem Kontaktbrückenhalter 5 im Uhrzeigersinn um die Lagerachse 29 des Kontaktbrückenhalters 5, bis der Kontaktarm 13 der Kontaktbrücke 4 gegen den Festanschlag 3 anschlägt und der Schwenkbewegung ein Ende setzt. Das Durchdrücken des besagten Kniehebels in die in Fig. 1 dargestellte Einschaltstellung erfolgt ohne jede Behinderung durch die Vorderkante 59 der Lagerhülse 47 allein durch den Druck der Kontaktfeder 2.To turn the switch back on. H. to transfer it from the switch-on position shown in FIG. 6 to its switch-on position shown in FIG. 1, the rocker arm 8 is pivoted counterclockwise. The rear edge 60 of the bearing sleeve 47 moved forward during this pivoting movement presses the end 46 of the pressure ram 23 in front of it. The toggle lever formed by disk 45 and pressure tappet 23 is pushed through its extended or dead center position again, the end of the holding arm 14 of the contact bridge 4 detaching from contact with the pivoting limit stop 17 by the contact bridge 4 being pivoted slightly clockwise relative to the contact bridge holder 5, d. H. the toggle lever formed by both parts is slightly bent. The contact spring 2 is further tensioned. As soon as the extended or dead center position of the toggle lever formed by disk 45 and pressure tappet 23 has passed through, the pressure exerted by the pressure tappet 23 on the contact bridge holder 5 is eliminated. The pressure of the contact spring 2 is fully effective. This first tears the holding arm 14 of the contact bridge 4 against the swivel limit stop 17 and then swivels the contact bridge 4 together with the contact bridge holder 5 clockwise around the bearing axis 29 of the contact bridge holder 5 until the contact arm 13 of the contact bridge 4 strikes against the fixed stop 3 and the swiveling movement End sets. The pressing of the toggle lever into the switch-on position shown in FIG. 1 takes place without any hindrance by the front edge 59 of the bearing sleeve 47 solely through the pressure of the contact spring 2.

Die Handausschaltung des in Einschaltstellung befindlichen Schalters (Fig. 1), d. h. dessen Überführung in die in Fig. 6 dargestellte Hand-Ausschaltstellung bzw. Einschaltbereitstellung erfolgt durch einfaches Schwenken des Kipphebels 8 im Uhrzeigersinn. Durch diese Schwenkung wird der durch die Scheibe 45 und den Druckstößel 23 gebildete Kniehebel durch seine Totpunkt- bzw. Streckstellung hindurchgeschwenkt. Dadurch wird die vorstehend genannte Einschaltbewegung gewissermaßen reversiert. Der Druckstößel 23 schwenkt den Kontaktbrückenhalter 5 entgegen dem Uhrzeigersinn um seine Lagerachse 29 mit der Folge zunächst der Knickung des durch Kontaktbrücke 4 und Kontaktbrückenhalter 5 gebildeten Kniehebels und dann der schlagartigen Öffnung des Kontaktes zwischen Kontaktbrücke 4 und Festkontakt 3.The manual switch off of the switch in the on position (Fig. 1), d. H. its transfer to the manual switch-off position or switch-on provision shown in FIG. 6 is carried out by simply pivoting the rocker arm 8 clockwise. As a result of this pivoting, the toggle lever formed by the disk 45 and the pressure tappet 23 is pivoted through its dead center or extended position. As a result, the above-mentioned switch-on movement is reversed to a certain extent. The pressure plunger 23 pivots the contact bridge holder 5 counterclockwise about its bearing axis 29, with the result first of all of the kinking of the toggle lever formed by contact bridge 4 and contact bridge holder 5 and then of the sudden opening of the contact between contact bridge 4 and fixed contact 3.

Befindet sich das Bimetall 7 nach einer Notauslösung noch in seiner ausgelenkten Stellung (Fig. 3), so ist eine Überführung des Schalters in seine Einschaltbereitstellung (Fig. 6) und damit eine Wiedereinschaltung von Hand unmöglich. Eine Schwenkung des Kipphebels 8 bei der in Fig. 3 dargestellten Notauslösestellung im Uhrzeigersinn führt zwar auch zu einem Durchdrücken des von ihm beaufschlagten Kniehebels durch seine Totpunkt- bzw. Streckstellung und damit zu einer Spannung der Kontaktfeder 2 sowie zu einer Schwenkung des Kontaktbrückenhalters 5 entgegen dem Uhrzeigersinn. Der Klinkenhebel 6 nimmt jedoch nicht seine Vertikalstellung (Fig. 1, 4 und 6) ein, sondern ist vielmehr durch die Entriegelungsfeder 35 mit seinem Schwenkende 20 in die Ausnehmung 42 des Verriegelungsanschlages hineingedrückt. Dadurch kann der Schwenkbegrenzungsanschlag 17 gegenüber dem Haltearm 14 der Kontaktbrücke 4 nicht wirksam werden, weil er außerhalb von dessen Schwenkweg liegt. Wird folglich der Kipphebel 8 wieder entgegen dem Uhrzeigersinn in Einschaltrichtung geschwenkt, reißt die Kontaktfeder 2 nach dem Durchlaufen des von ihm gesteuerten Kniehebels durch seine Totpunkt- bzw. Streckstellung den Haltearm 14 der Kontaktbrücke 4 nach oben. Dieser findet jedoch keinen Halt am Schwenkbegrenzungsanschlag 17, sondern wird sofort gegen den Festanschlag 22 des Klinkenhebels 6 gezogen, was lediglich eine Rückschwenkung des Klinkenhebels 6 unter Kompression der Entriegelungsfeder 35 zur Folge hat (Fig. 4), ohne daß jedoch die Kontaktbrücke 4 in ihre Einschaltstelluhg überführt wird.If the bimetal 7 is still in its deflected position (FIG. 3) after an emergency release, it is impossible to transfer the switch to its switch-on position (FIG. 6) and thus it cannot be switched on again by hand. A pivoting of the rocker arm 8 clockwise in the emergency release position shown in Fig. 3 also leads to a pushing of the toggle lever acted upon by its dead center or extended position and thus to a tension of the contact spring 2 and to a pivoting of the contact bridge holder 5 against Clockwise. The pawl lever 6, however, does not assume its vertical position (FIGS. 1, 4 and 6), but rather is with the unlocking spring 35 its pivot end 20 pressed into the recess 42 of the locking stop. As a result, the swivel limiting stop 17 cannot become effective with respect to the holding arm 14 of the contact bridge 4 because it lies outside of its swivel path. Consequently, if the rocker arm 8 is pivoted again counterclockwise in the switch-on direction, the contact spring 2, after passing through the toggle lever controlled by it, tears the holding arm 14 of the contact bridge 4 upward due to its dead center or extended position. However, this does not find a stop at the swivel limit stop 17, but is immediately pulled against the fixed stop 22 of the pawl lever 6, which only swivels the pawl lever 6 back under compression of the unlocking spring 35 (FIG. 4), but without the contact bridge 4 in it Einschaltstelluhg is transferred.

Der folgende Text betrifft das zweite Ausführungsbeispiel gemäß Fig. 9 bis 13. Zur Beschreibung sind

  • soweit möglich - die in Fig. 1 bis 8 verwendeten Termini technici beibehalten, wobei die zugehörige Bezugszahl um 100 erhöht ist.
The following text relates to the second exemplary embodiment according to FIGS. 9 to 13. For the description are
  • as far as possible - retain the technical terms used in Fig. 1 to 8, the associated reference number being increased by 100.

Beim zweiten Ausführungsbeispiel ist in einem Schaltergehäuse 101 eine Kontaktbrücke 104 um ein Kontaktbrückenlager 115 verschwenkbar angeordnet und in Kontaktschließrichtung durch die Kontaktfeder 102 beaufschlagt. In Einschaltstellung liegt das Kontaktende (Kontaktarm 113) am Festkontakt 103 an, das kontaktferne Ende (Haltearm 114) ist im Bereich des Kontaktbrückenlagers 115 durch den Verklinkungshebel 106 gehalten. Das mittige Drehlager 170 wird durch einen auf der Kontaktseite 171 der Kontaktbrücke 104 liegenden Gehäusevorsprung 172 gebildet, wobei zwischen dem Gehäusevorsprung 172 und der Kontaktseite 171 in Einschaltstellung ein geringer Abstand 173 vorhanden ist.In the second exemplary embodiment, a contact bridge 104 is arranged in a switch housing 101 so that it can pivot about a contact bridge bearing 115 and is acted upon in the contact closing direction by the contact spring 102. In the switched-on position, the contact end (contact arm 113) lies against the fixed contact 103, the end remote from the contact (holding arm 114) is held in the region of the contact bridge bearing 115 by the latching lever 106. The central rotary bearing 170 is formed by a housing projection 172 lying on the contact side 171 of the contact bridge 104, a small distance 173 being present between the housing projection 172 and the contact side 171 in the switched-on position.

Das Kontaktbrückenlager 115 besteht aus etwa parallel zur Kontaktschließrichtung verlaufenden Gehäusenuten 174, in welchen Seitenvorsprünge 175 des kontaktfernen Endes gleitbar einliegen.The contact bridge bearing 115 consists of housing grooves 174 which run approximately parallel to the contact closing direction and in which side projections 175 of the end remote from the contact slidably lie.

Um die Seitenvorsprünge 175 in dem (in Fig. 9-12) unteren Bereich der Gehäusenuten 174 festzuhalten, ist der Klinkenhebel 106 mit einer Langlochführung 176 versehen, die nach Art einer Kulisse die Seitenvorsprünge 175 umgreift. Die mittlere Lochlängsrichtung 177 der Langlochführung 176 verläuft winkelig zur mittleren Längsrichtung 178 der Gehäusenuten 174, so daß im Falle einer auf die Kontaktbrücke 104 wirksamen Handkraft PH (vgl. Fig. 12) durch die in der Langlochführung 176 gleitenden Seitenvorsprünge 175 eine Verschwenkung des entklinkten Klinkenhebels 106 in Pfeilrichtung 179 und anschließender Verklinkung erfolgt.In order to hold the side projections 175 in the lower region of the housing grooves 174 (in FIGS. 9-12), the pawl lever 106 is provided with an elongated hole guide 176 which engages around the side projections 175 in the manner of a backdrop. The central longitudinal direction 177 of the elongated hole guide 176 extends at an angle to the central longitudinal direction 178 of the housing grooves 174, so that in the event of a manual force P H acting on the contact bridge 104 (cf. Pawl lever 106 in the direction of arrow 179 and subsequent latching takes place.

Durch den Zug der Kontaktfeder 102 wird im Falle der Entklinkung (Fig. 11) der Klinkenhebel entgegen der Pfeilrichtung 179 verschwenkt. Dabei dreht die Kontaktbrücke 104 nach Art eines zweiarmigen Hebels um den Gehäusevorsprung 172, wobei die Kontaktstrecke durch den Zug der Kontaktfeder 102 förmlich aufgerissen wird. Bei der in Fig. 9 und 10 gezeigten Ein- und Ausschaltschwenkbewegung ist die Kontaktbrücke 104 ausschließlich als einarmiger Hebel wirksam, der um sein Kontaktbrückenlager 115 dreht.By pulling the contact spring 102, in the case of unlatching (FIG. 11), the ratchet lever is pivoted against the direction of arrow 179. The contact bridge 104 rotates in the manner of a two-armed lever around the housing projection 172, the contact path being torn open by the pull of the contact spring 102. In the on and off pivoting movement shown in FIGS. 9 and 10, the contact bridge 104 acts exclusively as a one-armed lever which rotates about its contact bridge bearing 115.

Fig. 13 verdeutlicht, daß der Klinkenhebel 106 U-förmigen Querschnitt hat und mit seinen U-Schenkeln 180 das kontaktferne Ende der Kontaktbrücke 104 derart umgreift, daß die Seitenvorsprünge 175 die Langlochführungen 176 durchgreifen und in die Gehäusenuten 174 eingreifen.Fig. 13 illustrates that the latch lever 106 has a U-shaped cross-section and with its U-legs 180 engages around the non-contact end of the contact bridge 104 such that the side projections 175 pass through the elongated hole guides 176 and engage in the housing grooves 174.

Eine « Mischlösung » aus den beiden vorbeschriebenen Ausführungsbeispielen stellt das in Fig. 14 gezeigte Ausführungsbeispiel dar. Dort wird nämlich von der Nutführung des zweiten Ausführungsbeispiels gemäß Fig. 9 bis 13 Gebrauch gemacht, wobei die im Schaltergehäuse 201 angeordneten Gehäusenuten 274 mit zugehörigen Seitenvorsprüngen 275 in den Mittelbereich der Kontaktbrücke 204 verlegt sind, am kontaktfernen Ende (Haltearm 214) aber die Kontakthebelverklinkung mit Klinkenhebel 206 verwendet ist, wie sie im ersten Ausführungsbeispiel gemäß Fig. 1 bis 8 dargestellt ist.The embodiment shown in FIG. 14 represents a “mixed solution” of the two previously described exemplary embodiments. This is because use is made of the groove guide of the second exemplary embodiment according to FIGS. 9 to 13, the housing grooves 274 arranged in the switch housing 201 with associated side projections 275 in the middle region of the contact bridge 204 are relocated, but the contact lever latching with the latch lever 206 is used at the end remote from the contact (holding arm 214), as is shown in the first exemplary embodiment according to FIGS. 1 to 8.

Claims (27)

1. Manually operated overload protective switch, in particular permetering switch, having trip-free release and the following features :
an extended contact bridge (4 ; 104 ; 204) which is springloaded (contact spring 2 ; 102) on one side is arranged in a switch housing (1 ; 101 ; 201).
the pivot movement of which contact bridge (4 ; 104 ; 204) can be manually controlled in the switch plane by a handle (rocking lever 8),
which contact bridge (4 ; 104 ; 204) interacts with a fixed contact (3 ; 103) to close the current path,
in the switch-on position, at its contact-remote end (retaining arm 14 ; 114 ; 214), can be locked (locking position) in a first position by a ratchet lever (6; 106 ; 206) interacting with a tripping device, and
can be supported approximately in its centre area on one side to form a central pivot bearing (contact bridge bearing 15) supporting a two-arm lever, characterized by the following features :
the handle (rocking lever 8) or an intermediate member (push rod 23) interacting with this handle acts on the contact bridge (4 ; 104 ; 204) in the opening pivoting direction for pivoting in the manner of a single-arm lever, pivotally mounted at its contact-remote end, while passing dead centre and subsequently running free in the area of the pivoting end positions of the handle,
the spring (contact spring 2 ; 102 ; 202) loads the contact bridge (4 ; 104 ; 204) in the contact closing direction in the contact bridge area located between the contact-remote end and the central pivot bearing (contact bridge bearing 15, pivot bearing 170),
the contact-remote end of the contact bridge (4; 104 ; 204), in the event of tripping, after release by the ratchet lever (6 ; 106; 206), pivots away in the loading direction of the contact spring (2 ; 102 ; pulling direction of the contact spring designed as a tension spring), with
the contact bridge (4 ; 104 ; 204) turning as a two-arm lever while seated on the central pivot bearing or when the latter comes into effect, and the contact end lifting from the fixed contact (3 ; 103) under the force of the contact spring (2 ; 102).
2. Overload protective switch according to claim 1, characterized in that the central pivot bearing is formed by a contact bridge holder (5) which is pivotable in the switch housing (1) and holds the contact bridge (4) approximately centrally such that the latter has a free turning motion.
3. Overload protective switch according to claim 1, characterized in that the central pivot bearing (170) is a housing projection (172) located on the contact side (171) of the contact bridge (104 ; 204), and the contact bridge (104 ; 204), is held/guided by guide means arranged in the housing (101 ; 201) and permitting the tripping movement.
4. Overload protective switch according to claim 1, characterized in that the central pivot bearing is formed by the free end (48) of the intermediate member (23).
5. Overload protective switch according to claim 3, characterized in that the guide means are made as housing grooves (174) which run approximately parallel to the contact closing direction and have lateral projections (175) guided therein on the contact-remote end of the contact bridge (104).
6. Overload protective switch according to claim 3, characterized in that the contact bridge is guided in its centre area by lateral projections (275) engaging into lateral housing grooves (274), and the central pivot bearing is formed by end stops defining the housing grooves (274).
7. Overload protective switch according to claim 1 or 2, characterized in that the contact bridge holder (5), with its end facing away from the contact bridge bearing (15), is mounted on the switch housing (1) and is acted upon by a pushrod (23) which is active against the contact spring (2) and can be conveyed by the handle designed as a rocking lever (8) across a dead centre with subsequent automatic free motion.
8. Overload protective switch according to claim 7, characterized in that the contact bridge (4) and contact bridge holder (5) are connected to one another in the manner of the guide arms of a toggle lever, the toggle joint of which can be conveyed into its extended position by the pushrod (23) and into its angled position by the contact spring (2).
9. Overload protective switch according to one of the preceding claims, characterized in that the ratchet lever (6) runs approximately at right angles to the longitudinal direction of the contact bridge (4) and to the contact bridge holder (5).
10. Overload protective switch according to one of the preceding claims, characterized in that the pivot axis (19) of the ratchet lever (6) is arranged at its end facing towards the rocking lever (8), and a bearing axis (29) of the contact bridge holder (5) is arranged between the pivot axis (19) and the pivoting end (20) of the ratchet lever (6).
11. Overload protective switch according to one of the preceding claims, characterized in that a pivoting-limit stop (17) is effective only in the contact opening direction (21) against a retaining arm (14) of the contact bridge (4), limiting the pivoting path of the latter, and is located approximately in the geometric centre point of the bearing axis (29).
12. Overload protective switch according to one of the preceding claims, characterized in that the pivoting-limit stop (17) is mounted on the ratchet lever (6) such that it can be pivoted away from its stop position and is acted upon by a restoring spring (30), turning it back into its pivoting-limit position, in such a way that it projects as a stop into the pivoting path of the retaining arm (14) of the contact bridge (4), which retaining arm (14) is pivoted in the contact opening direction (21), and, when the contact bridge (4) pivots back from the contact with a fixed stop (22), is deflected from its stop position by the retaining arm (14).
13. Overload protective switch according to one of the preceding claims, characterized in that, in the contact opening position, the end (31) of the contact arm (13) sits against a stop (32) fixed to the housing, in particular against a quenching plate of a quenching chamber (33).
14. Overload protective switch according to one of the preceding claims, characterized in that the ratchet lever (6), in the unlocking direction (34), is acted upon by an unlocking spring (35) against a locking stop (36) which can be pivoted away from its effective position against the pressure of a restoring spring by bimetal deflection.
15. Overload protective switch according to one of the preceding claims, characterized in that the bimetal part (7) runs approximately parallel to and next to the ratchet lever (6) and its deflection end (38), located approximately next to the pivoting end (20) of the ratchet lever (6), acts during deflection on an arm (39) of a bell-crank lever (40) pivotably mounted on the housing (1) in the switch plane, the other arm (41) of which bell-crank lever (40) acts upon the locking stop (36) in its unlocking direction opposite the ratchet lever (6).
16. Overload protective switch according to one of the preceding claims, characterized in that, between two pivoting end positions located on both sides of a dead centre position next to the contact bridge holder (5), the pushrod (23) is articulated in pivotable manner in the switch plane on the end (43) of a switch guide pivotably mounted on the switch housing (1).
17. Overload protective switch according to one of the preceding claims, characterized in that the switch guide is designed as a disc (45) which is pivotably mounted about the rocking lever axis (44) and has a pushrod (23) articulated on its periphery, the rocking lever (8) is mounted on the periphery of the disc (45), and a bearing bush (47) of the rocking lever (8), which bearing bush (47) encloses the disc (45), is provided in the area of the articulation of the switch guide with a cut out (58), the length of which pointing in the peripheral direction corresponds to the pivoting path of the switch guide bearing between its dead centre position and its pivoting end positions.
18. Overload protective switch according to one of the preceding claims, characterized in that the contact bridge holder (5), in the switch plane, contains cheeks (51) which run parallel to one another and between which are arranged the contact bridge (4) and the ratchet lever (6).
19. Overload protective switch according to one of the preceding claims, characterized in that the contact bridge axis is formed by pins (52) which are integrally formed on both sides onto the contact bridge (4) and sit in bearing bosses (53) of the cheeks (51).
20. Overload protective switch according to one of the preceding claims, characterized in that the bearing bosses (53), on the contact spring side, in each case have a convex side wall (54) as an abutment for the pivoting movement of the contact bridge (4).
21. Overload protective switch according to one of the preceding claims, characterized in that the ratchet lever (6) is a sheet-metal part, bent in a U-shape in cross-section, between the U-webs of which sheet-metal part projects the retaining arm (14) of the contact bridge (4).
22. Overload protective switch according to one of the preceding claims, characterized in that the pivoting-limit stop (17) is made as a shaft which is pivotably mounted in the cheeks (61) of the ratchet lever (6), the cross-section of which shaft is formed in an approximately semi-circular shape in the stop area located between the U-legs, with the retaining arm (14) of the contact bridge (4), in the pivoting-limit position, resting with its end against the semi-circular cross-section peripheral area (56) which protrudes into the pivoting path and is adjacent to the semi-circular diameter (55) and which, by rotation of the shaft or by the ratchet lever (6) pivoting away, can be guided away from the loading applied by the retaining arm (14).
23. Overload protective switch according to one of the preceding claims, characterized by an additional fuse insert (26) which is arranged in the installed condition next to the rocking lever (8) and pushrod (23) and is also accessible from outside.
24. Overload protective switch according to claim 5 or 6, characterized in that the lateral projections are enclosed by an elongated hole guide of the ratchet lever (6), the hole longitudinal direction of which elongated hole guide runs at an angle to the longitudinal direction of the housing grooves.
25. Overload protective switch according to claim 5 or 24, characterized in that the housing grooves are made in a curved shape, with the curve radius approximately corresponding to the distance of the housing grooves from the housing projection forming the central pivot bearing.
26. Overload protective switch according to one of the preceding claims, characterized in that the elongated hole is bent approximately in its centre area in such a way that the elongated hole section facing towards the pivoting end of the ratchet lever points away at an angle from the latching location.
27. Overload protective switch according to one of the preceding claims, characterized in that the ratchet lever (6) of U-shaped cross-section projects with its U-Iegs into the housing area provided with the housing grooves, and the lateral projections arranged on the contact bridge on both sides penetrate through the elongated hole guides arranged in the U-Iegs.
EP84105015A 1983-05-06 1984-05-04 Overcurrent circuit breaker Expired EP0127784B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84105015T ATE21186T1 (en) 1983-05-06 1984-05-04 OVERCURRENT PROTECTION SWITCH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3316574 1983-05-06
DE3316574 1983-05-06

Publications (2)

Publication Number Publication Date
EP0127784A1 EP0127784A1 (en) 1984-12-12
EP0127784B1 true EP0127784B1 (en) 1986-07-30

Family

ID=6198317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105015A Expired EP0127784B1 (en) 1983-05-06 1984-05-04 Overcurrent circuit breaker

Country Status (4)

Country Link
EP (1) EP0127784B1 (en)
AT (1) ATE21186T1 (en)
DE (1) DE3460392D1 (en)
GR (1) GR82081B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410340A1 (en) * 1984-03-21 1985-10-03 Heinrich Kopp Gmbh & Co Kg, 8756 Kahl Meter preliminary automatic circuit breaker
DE8611082U1 (en) * 1986-04-23 1986-07-17 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Hand operated electrical switch
NL8703170A (en) * 1987-12-31 1989-07-17 Holec Syst & Componenten ELECTROMAGNETIC SWITCH.
NL8703172A (en) * 1987-12-31 1989-07-17 Holec Syst & Componenten SWITCH, ESPECIALLY FOR USE AS A SWITCH.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688675A (en) * 1953-07-20 1954-09-07 Gen Electric Electric circuit breaker
DE2242128A1 (en) * 1972-08-26 1974-03-07 Geyer Fa Christian MECHANISM FOR SELF-SWITCHING

Also Published As

Publication number Publication date
GR82081B (en) 1984-12-13
ATE21186T1 (en) 1986-08-15
DE3460392D1 (en) 1986-09-04
EP0127784A1 (en) 1984-12-12

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