EP0543208B1 - Disjoncteur de protection avec bascule - Google Patents

Disjoncteur de protection avec bascule Download PDF

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Publication number
EP0543208B1
EP0543208B1 EP92118774A EP92118774A EP0543208B1 EP 0543208 B1 EP0543208 B1 EP 0543208B1 EP 92118774 A EP92118774 A EP 92118774A EP 92118774 A EP92118774 A EP 92118774A EP 0543208 B1 EP0543208 B1 EP 0543208B1
Authority
EP
European Patent Office
Prior art keywords
switching rocker
frame
rocker
protective circuit
switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92118774A
Other languages
German (de)
English (en)
Other versions
EP0543208A1 (fr
Inventor
Paul Cambreleng
Karl R. Kropp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Electromechanical Components Inc
Original Assignee
Potter and Brumfield Inc
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 Potter and Brumfield Inc filed Critical Potter and Brumfield Inc
Publication of EP0543208A1 publication Critical patent/EP0543208A1/fr
Application granted granted Critical
Publication of EP0543208B1 publication Critical patent/EP0543208B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0221—Majority of parts mounted on central frame or wall
    • 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
    • H01H71/54—Manual reset mechanisms which may be also used for manual release actuated by tumbler

Definitions

  • This circuit breaker is preferably used as an overcurrent circuit breaker, with a known trigger mechanism, for example with a bimetal strip, being provided.
  • Such an overcurrent circuit breaker is known for example from US-A-4,931,762.
  • a rocker switch as an actuating element, which is pivotably mounted on a frame by means of a bearing pin.
  • the rocker switch has an actuating arm, which is connected to a coupling link Swivel arm are connected, wherein the coupling members are each mounted with molded pins in the actuating arm of the rocker and in the swivel arm.
  • the swivel arm itself is mounted in the frame via a pin which is longitudinally movable in a guide slot in the frame.
  • the object of the invention is to design a circuit breaker of the type mentioned in such a way that all functional elements can be easily connected to one another without additional bearing pins or other fastening elements being required.
  • rocker switch and the other functional elements are to be guided and securely fastened both during assembly and in operation, without special individual elements having to be manufactured and assembled for such guides or interlocks.
  • the frame has a rod-shaped projection which extends under one movable end of the rocker switch and approximately in accordance with the pivoting movement of the rocker switch is curved in a circular arc that the shift rocker has a fork extension at the mentioned movable end, which comprises the projection of the frame during the switching movement, and that the return spring sits on the projection and is supported on the fork extension.
  • the projection of the frame which extends next to one end of the rocker switch and is curved in accordance with the pivoting movement of this rocker end, forms, together with the fork extension of the rocker, a guide for this, which facilitates mounting in the correct position already during assembly, but also in Operation of the switch maintains this management function.
  • this projection serves as a carrier and guide element for the helical return spring, which is supported on the frame on the one hand and on the fork extension of the rocker switch on the other hand and thus prestresses it in an off position.
  • the rocker itself is preferably latched on bearing elements of the frame, which are formed in the form of oppositely projecting bearing pins on the bearing support, the rocker switch in opposite side walls each having a bearing recess with which it is mounted on one of the bearing pins, and at least one of the side walls of the rocker switch in the area between the bearing recess and its edge has an elastically deformable section, by means of which the rocker switch can be pushed onto the associated bearing journal and latched thereon.
  • the circuit elements each comprise a fixed contact element 1, which is formed in one piece with a connection element 3 and is bent perpendicular to the latter.
  • contact springs 5 made of leaf spring metal which are clamped on one side and each carry a contact piece 7 at their free end.
  • Each contact spring 5 is attached at its opposite end in a conventional manner to a circuit breaker frame 9 made of insulating material. In a relaxed position, the respective contact spring 5 holds its contact piece 7 above and separate from the associated fixed contact element 1 and thus keeps the corresponding circuit open.
  • Flexible conductors or strands 11 are each fastened at one end close to the point of the contact springs 5 where they are connected to the frame 9.
  • the fastening area for the respective strand 11 can be a section of the spring material be which is bent at an angle from the fastening area of the respective contact spring 5.
  • Each strand 11 is fastened at its opposite end to one end of a corresponding bimetal strip 13, which consists of two or more different metallic materials. These metallic materials have different coefficients of thermal expansion.
  • the ends of the two bimetal strips 13 opposite the respective strand connection are connected at an angle to corresponding load connection elements 15. Both the bimetallic strips 13 and the load connection elements 15 are locked to the frame 9 such that the load connection elements 15 protrude through the bottom of the frame 9.
  • a common pawl 17 is arranged directly adjacent to and at a short distance from the bimetal strips 13.
  • This pawl 17 has a cylindrical surface 19 in the form of a transverse axis, which can be snapped into a bearing recess 21 in the frame 9 with a partially circular wall.
  • the circular arc-shaped bearing recess 21 extends with its cylindrical wall over an angle of more than 180 ° and has an opening which corresponds to the diameter of the cylindrical surface or the transverse axis 19. Since the open gap of the partially round bearing recess 21 and the cylindrical surface of the transverse axis are the same, an overlap of the parts is provided in such a way that the cylindrical surface or transverse axis 19 must be pressed or snapped into the round bearing recess 21.
  • the round bearing recess 21 is first widened to accommodate the cylindrical surface or transverse axis 19 and then takes its original position or shape again, holding the cylindrical surface or transverse axis, but allowing its free rotation within the bearing recess 21. If the pawl 17 is subjected to an external force, it can pivot freely over the cylindrical surface or transverse axis 19.
  • the widening of the bearing recess 21 for inserting the transverse axis 19 of the pawl is preferably made possible in such a way that the open section of the bearing recess 21 is limited by a resiliently deformable latching tongue 22 which is formed on the frame and enables the pawl to snap in with its transverse axis 19 and after snapping the pawl, the bearing recess 21 closes again.
  • the common pawl 17 has an upper portion 23 and a lower portion 25.
  • the lower portion 25 engages and disengages with a locking portion 26 of a cam lever 27, which will be described later.
  • the upper section 23 of the pawl 17 is biased into its rest position by a compression spring 29. In this position, it can engage the bimetallic strips 13 when they are heated and bend accordingly towards the upper section 23 of the pawl.
  • the force exerted by the bimetallic strips 13 on the upper section 23 of the pawl causes the pawl 17 to pivot within the bearing recess 21.
  • the pawl is returned to its initial position by the compression spring 29.
  • the compression spring 29 is arranged and fixed between the frame 9 and the upper section 23 of the pawl in a conventional manner. Even if the pawl is reset to its initial state after tripping, the cam lever remains in its tripped state until it is manually switched back to its on state brought, which will be described in more detail later.
  • the frame 9 has a bearing support 30 for holding a rocker switch 33 and a cylindrical bearing journal 31 on both sides thereof; the rocker switch 33 engages on these journals with bearing recesses 35 formed in opposite side walls 38. After the switching rocker 33 has snapped into place on the bearing journal 31, the recesses 35 serve as a pivot axis for the switching rocker for its movements between a switch-on and a switch-off position.
  • the partially circularly cut-out bearing recesses 35 in the side walls 38 of the rocker switch each have an open side, which is largely closed by a flexible tongue 37 fastened on one side.
  • This tongue 37 in each of the two side walls 38 of the rocker switch is formed by slots in the side walls, which each extend up to the vicinity of an end edge of this respective side wall.
  • the tongues 37 can thus bend outwards and enable the bearing journal to snap into the bearing recesses 35.
  • the journals run within the two grooves 40 and at the same time press the flexible tongues 37 outward until the journals 31 are engaged in the bearing recesses 35.
  • the flexible tongues 37 then spring back into their starting position and hold the journals 31 in the circular bearing recesses 35 and thereby form bearing surfaces for the journals 31 when the rocker switch rotates around these journals during the movement between the switch-on and switch-off positions.
  • rocker switch 33 on the frame 9 is simple and accurate, without requiring any additional pins, rivets, screws or other fasteners.
  • the rocker switch is a single molded part, which can be made of opaque or transparent plastic.
  • Figures 3 and 4 show a detailed view of the locking arrangement for the rocker switch.
  • the rocker switch 33 is connected to the cam lever 27 via coupling arms 39 attached on both sides for transmitting the switching movement.
  • the coupling arms 39 each have at one end a tapered and slotted rocker pivot pin 41 which is inserted through a corresponding round opening 43 in the rocker switch 33.
  • the pivot pin 41 When the pivot pin 41 is inserted into the openings 43, the slotted sections are pressed together. After insertion, these slotted sections spring apart again and lock, for example with projecting shoulders or the like, on the inside of the side walls 38 in the region of the openings 43; the pivot pins 41 are thus held in place, but allow the coupling arms 39 to pivot relative to the rocker switch 33.
  • the coupling arms 39 each have a cam lever pivot pin 45 at the opposite end to the rocker pivot pins 41. These cylindrical pivot pins 45 project through corresponding openings 47 in the cam lever 27 and beyond into a groove 49 in the frame 9. These grooves 49 on both sides of the frame 9 extend in the switching direction from the rocker switch in the direction of the movable contact springs 5, and the movement of the cam lever pivot pin 45 in the grooves 49 causes a switching path which actuates the switching part of the circuit breaker.
  • the cam lever pivot pins 45 act as bearing axles for the cam lever 27.
  • the coupling arms 39 also each have a shoulder 50 at a certain distance from the respective rocker pivot pin 41; The arcuate edge 51 of the respective side wall 38 of the rocker switch can roll on this shoulder 50.
  • the cam lever 27 is split in a fork shape and thus includes the bearing support for the rocker switch 33 with two actuating arms 28. With the ends of the actuating arms 28, the switching force transmitted from the rocker switch 33 via the coupling arms 39 is exerted on the contact springs 5.
  • a spring 53 is arranged between the rocker switch and the frame 9.
  • the frame 9 has a spring support 55 with a curved projection 57, which extends approximately along the circular direction of movement of the one movable end 34 of the rocker switch 33.
  • the rocker switch has a fork extension 59, which extends outward at the end 34 and comprises the projection 57 with its two arms.
  • the curved projection 57 thus extends through the fork extension 59 and thus forms a guide for the rocker switch 33 when it is pivoted between its switch-on and switch-off positions.
  • the fork extension 59 also serves as an upper support for the spring 53.
  • the fork extension 59 and the curved projection 57 are already used during the assembly of the rocker switch 33 to guide it and center it on its mounting, and subsequently they also serve this purpose to hold the spring 53 in place and in its elongated-curved shape.
  • the fork extension 59 can additionally have on its underside a pin 58, indicated in FIG. 1, which engages in the spring 53 in order to additionally improve the stability of the holder and guide for the spring.
  • the circuit breaker also has two adjusting screws 60, each of which corresponds to one of the bimetal strips 13 and is assigned.
  • the distance between the bimetallic strips 13 and the common pawl 17 determines how much the bimetallic strips have to bend to touch the common pawl 17.
  • the extent to which the bimetallic strips 13 bend is a function of that which bears against them Current. Accordingly, by using the adjusting screws 60 in connection with the nuts 62 clamped in the frame for the purpose of adjusting the angular distance between the bimetallic strips 13 and the common pawl 17, the distance required for the overload condition can be set.
  • the circuit breaker with rocker switch can also contain a miniature lamp 61, which is arranged on a support surface 63 in the frame 9. In this case, connecting wires 65 connect the miniature lamp to the load connections 15.
  • a resistor (not shown) is expediently switched into the lamp circuit in order to limit the current through the lamp.
  • an auxiliary switch 67 can also be additionally fastened in the frame 9 for certain applications; for this purpose the frame has laterally projecting cylindrical retaining pins 69 which engage in corresponding retaining holes 71 in the auxiliary switch 67.
  • the frame 9 comprises the auxiliary switch 67 from three sides in a recess.
  • a lever 73 which is tied up in the frame 9, actuates the auxiliary switch 67 when it is moved in accordance with a movement of the contact springs 5 during their actuation by the rocker switch 33 into its on or off position.
  • a cap 75 has an upper flange part 77 with a right-angled opening 78 through which the rocker switch 33 engages.
  • the cap 75 is open at the bottom so that the entire circuit breaker mechanism can be inserted into the cap.
  • the cap 75 is held in the assembled position by the engagement of chamfered projections 79 in corresponding openings 81 in the side wall 83 of the cap 75.
  • the cap 75 is secured by stops which are formed by interlocking parts of the frame 9 and the cap 75.
  • the cap 75 also has a snap fastening device, which makes it possible to mount the cap with a control panel (not shown) to engage.
  • the latching fastening device consists of flexible arms 85 which extend downward from the flange section 73 (FIG. 2) or upward from a side wall of the cap (FIG. 1). They have sawtooth-shaped notches 87, which engage behind flange sections of a control panel. The flexible arms could also protrude the width of the circuit breaker to help center the circuit breaker in a cutout in the panel.
  • Figure 5 shows the circuit breaker parts in the off position. This position results when the rocker switch is manually brought into the off position or when the circuit breaker has been triggered by the heating of one of the bimetal strips 13 and its movement against the pawl 17 and, accordingly, the pawl 17 after the bimetal strip has cooled by the compression spring 53 in it Normal position was returned.
  • the contact springs 5 are in the open position so that the cam lever pivot pins 45 are in the upper section of the guide groove 49 and the locking section 26 of the cam lever 27 is in engagement with the lower section 25 of the common pawl 17. All parts are held in position by the rocker return spring 53.
  • Figure 6 shows the circuit breaker in the on position.
  • the rocker switch 33 is pressed into the switched-on position, which brings one end of the coupling arm 39 through an angle to an over-center position relative to the guided position of the other end with the cam lever pivot pin 45.
  • the lower portion of the common pawl 17 is engaged with the locking portion 26 of the cam lever 27, which causes the cam lever 27 to bring the contact springs 5 into the closed position while doing so
  • the bimetallic strip 13 bends toward the upper portion 23 of the common pawl 17 and, after contacting it, exerts sufficient force on the lower portion 25 of the common pawl 17 to be released from the locking section 26 of the cam lever 27. This enables the locking section 26 of the shift lever 27 to be pivoted and thus a release of the holding force which was exerted by the over-center position of the rocker switch 33.
  • the return spring 53 brings the rocker switch 33 into the off position.
  • the trigger position is shown in Figure 7.
  • Figure 8 shows the circuit breaker in a position in which the rocker switch 33 is held in the ON position. This state is called the release free position.

Landscapes

  • Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Thermally Actuated Switches (AREA)

Claims (13)

  1. Disjoncteur de protection, qui présente les caractéristiques suivantes:
    - un cadre (9) avec un support,
    - une bascule (33) logée de manière pivotante sur le support (30)
    - au moins un élément de contact fixe (1) monté sur le cadre,
    - au moins une lame de contact mobile (5), fixée par une extrémité sur le cadre (9) et faisant face avec sa deuxième extrémité mobile à l'élément de contact fixe (1),
    - au moins un organe de commande (27), qui est susceptible de transmettre la position de la bascule sur le ressort de contact mobile (5),
    - un mécanisme de déclenchement (13, 17) pour enclencher et déclencher l'organe de commande (27), et
    - un ressort de rappel (53) en forme de vis, qui prend appui sur le cadre (9) et la balance (33) et précontraint ceux-ci dans une position d'ouverture,
       caractérisé en ce que le cadre (9) comporte une saillie (57) en forme de tige, qui s'étend au-dessous de l'une des extrémités mobiles (34) de la bascule (33) et est, selon le mouvement pivotant de la bascule (33), approximativement courbée en arc, en ce que la bascule (33) comporte à ladite extrémité mobile (34) un prolongement à fourche (59) qui enveloppe la saillie (57) du cadre (9) pendant le mouvement de commutation et en ce que le ressort de rappel (53) est placé sur la saillie (57) et prend appui sur le prolongement à fourche (59).
  2. Disjoncteur de protection selon la revendication 1, caractérisé en ce que la bascule (33) est logée de manière encliquetable sur des éléments de support (31) du cadre (9).
  3. Disjoncteur de protection selon la revendication 2, caractérisé en ce que le support (30) comporte deux tourillons d'appui (31) faisant saillie dans le sens opposé, en ce que la bascule (33) comporte dans des parois latérales (38) opposées respectivement un creux de support (35), au moyen duquel elle est logée sur respectivement un des tourillons d'appui (31), et en ce qu'au moins l'une des parois latérales (38) de la bascule (33) comporte dans la zone entre le creux de support (35) et son bord (51) un tronçon élastiquement déformable (37), par l'intermédiaire duquel la bascule peut se glisser sur le tourillon d'appui (31) correspondant et s'encliqueter sur celui-ci.
  4. Disjoncteur de protection selon la revendication 3, caractérisé en ce que le tronçon élastiquement déformable dans la paroi latérale (38) de la bascule (33) a chaque fois la forme d'une lame élastiquement déformable (37) dont l'extrémité libre limite un côté du creux de support (35).
  5. Disjoncteur de protection selon la revendication 3 ou 4, caractérisé en ce que les parois latérales (38) de la bascule présentent chacune sur leur face interne une rainure de guidage (40) s'étendant en direction du creux de support (35).
  6. Disjoncteur de protection selon l'une des revendications 1 à 5, caractérisé en ce qu'un levier à came (27), qui comporte une partie de commande (28) reposant sur la lame de contact respective et une partie de verrouillage (26) susceptible de prendre appui sur le mécanisme de déclenchement (13, 17) sert d'organe de commande, le levier à came (27) pouvant pivoter dans la partie centrale autour d'un axe à came (45) parallèle à l'axe de pivotement de la bascule (33), et le levier à came (27) avec son axe à came (45) pouvant être déplacé par la bascule en direction de la lame de contact (5), et en ce que le mécanisme de déclenchement comporte un cran d'arrêt (17), qui est logé dans le cadre et peut pivoter autour d'un axe à cran (19) parallèle à l'axe à came (45) et est précontraint par effet de ressort dans une position de verrouillage, dans laquelle il est en prise avec le tronçon de verrouillage (26) du levier à came (27), tandis qu'il libère le tronçon de verrouillage (26) du levier à came (27) lors d'un pivotement contre l'effet de ressort.
  7. Disjoncteur de protection selon la revendication 6, caractérisé en ce que le cran d'arrêt (17) est logé de manière mobile, au moyen d'un axe transversal (19) cylindrique, dans un creux de support (21) à paroi partiellement cylindrique formé dans le cadre, le côté ouvert du creux de support (21) étant protégé par une lame d'arrêt (22) élastique.
  8. Disjoncteur de protection selon la revendication 6 ou 7, caractérisé en ce que pour transmettre le mouvement de commutation de la bascule (33) sur le levier à came (27) est prévu au moins sur un côté un bras de couplage (39), qui est logé de manière rotative avec l'une de ses extrémités, par l'intermédiaire d'un pivot de bascule (41) dans un creux de commande (43) de la bascule disposé excentriquement, et avec son autre extrémité, par l'intermédiaire d'un pivot de came (45) dans un creux axial (47) du levier à came (27).
  9. Disjoncteur de protection selon la revendication 8, caractérisé en ce que le pivot de bascule (41) du bras de couplage (39) peut s'encliqueter avec une extrémité fendue et élargie en forme de crochet dans le creux de commande (43) de la bascule (33).
  10. Disjoncteur de protection selon la revendication 8 ou 9, caractérisé en ce que le pivot de came (45) du bras de couplage (39) s'engrène à travers le creux axial (47) du levier à came (27) dans une rainure de guidage (49) du cadre, laquelle permet le déplacement de l'axe de came en direction de la lame de contact.
  11. Disjoncteur de protection selon l'une des revendications 5 à 10, caractérisé en ce que deux paires de contact sont disposées dans le cadre (9), de part et d'autre du support (30), comportant chacune un élément de contact fixe (1) et une lame de contact mobile, et en ce que le levier à came (27) présente une extrémité de commande divisée en forme de fourche, laquelle entoure le support (30) des deux côtés et agit avec respectivement un bras de commande (28) sur les deux lames de contact (5).
  12. Disjoncteur de protection selon l'une des revendications 1 à 11, caractérisé en ce que la bascule (33) est en une pièce avec des parois transparentes en matière plastique et un intérieur creux.
  13. Disjoncteur de protection selon la revendication 12, caractérisé en ce que sur le cadre (9) est disposée une lampe témoin (61) s'avançant à l'intérieur de la bascule (33).
EP92118774A 1991-11-18 1992-11-02 Disjoncteur de protection avec bascule Expired - Lifetime EP0543208B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/792,523 US5223813A (en) 1991-11-18 1991-11-18 Circuit breaker rocker actuator switch
US792523 1991-11-18

Publications (2)

Publication Number Publication Date
EP0543208A1 EP0543208A1 (fr) 1993-05-26
EP0543208B1 true EP0543208B1 (fr) 1995-10-25

Family

ID=25157197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118774A Expired - Lifetime EP0543208B1 (fr) 1991-11-18 1992-11-02 Disjoncteur de protection avec bascule

Country Status (6)

Country Link
US (1) US5223813A (fr)
EP (1) EP0543208B1 (fr)
AT (1) ATE129596T1 (fr)
CZ (1) CZ281279B6 (fr)
DE (1) DE59204129D1 (fr)
ES (1) ES2079769T3 (fr)

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Also Published As

Publication number Publication date
CZ281279B6 (cs) 1996-08-14
DE59204129D1 (de) 1995-11-30
ES2079769T3 (es) 1996-01-16
ATE129596T1 (de) 1995-11-15
CZ340792A3 (en) 1993-06-16
EP0543208A1 (fr) 1993-05-26
US5223813A (en) 1993-06-29

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