EP0851449B1 - Switchgear for an electric installation - Google Patents

Abstract

The switch has a pole and corresponding electromagnetic (18) and thermal (34) triggers, a contact point, a chamber and connecting contacts. A pressure knob (13) forms an actuating element with a latching lever (90) mounted upon it which can be actuated by the thermal and electromechanical triggers. The latching lever forms a latching point on the pressure knob in conjunction with a coupling element (60) coupled to the contact lever (64) so that the contact lever is pivoted towards the switch-off direction when it unlatches.

Description

The invention relates to an installation switching device, in particular a single-pole circuit breaker according to the preamble of claim 1.

Single-pole circuit breakers are generally designed so that the pole, the is a complete single-pole circuit breaker, each with a tripping unit electromagnetic and a thermal release, a key switch with a latching point and with an actuator coupled to it and a contact apparatus, has an arcing chamber and terminals.

Most electrical circuit breakers have a switch toggle, see for example EP 0619590 A1.

A push button switch of the type mentioned is known from DE 1051948 B. become. However, this push button switch is designed so that the key switch is relatively complicated and that another push button is provided with which the switch can be turned off.

The object of the invention is an installation switching device of the type mentioned, in particular to create a single-pole circuit breaker, which simplifies the structure is trained.

This object is achieved by the features of claim 1.

According to the invention there is a running in the push button in the direction of movement of the push button Elongated hole arranged in which one end of the coupling element is guided; at the Klinkhebel a nose is provided, the latching point with the coupling element forms; the coupling element is a U-shaped bracket, one leg in the Elongated hole and the other leg is coupled to the contact lever; the Jack lever works with one of the electromagnetic and thermal Trigger actuated transmission member designed as a striker together.

In a preferred embodiment, the pawl lever is an L-shaped pawl, one Has leg that runs approximately parallel to the direction of movement of the push button and their perpendicular to the leg in connection with the hammer stands.

According to the invention, the latch lever is constantly under the pressure of a spring this applied towards the impact lever.

The special embodiment of the push button goes from claims 10 and 11 out; a latching lever cooperates with the sliding surfaces, which holds the push button in the depressed position and from the movable Contact lever can be pushed off the sliding surfaces.

Further advantageous embodiments of the invention are the further subclaims refer to.

Using the drawing, in which some embodiments of the invention are shown are the invention, further advantageous refinements and improvements the invention and further advantages are explained and described in more detail.

Fig. 1

eine Ausführungsform der Erfindung in Einschaltstellung,

Fig. 2

die Ausführungsform gemäß Fig. 1 bei Auslösung durch den thermischen Auslöser,

Fig. 3

eine perspektivische Aufsicht auf den Druckknopf für den Leitungsschutzschalter, und

Fig. 4 bis 15

unterschiedliche Stellungen des Druckknopfes.

Show it:

Fig. 1

an embodiment of the invention in the on position,

Fig. 2

1 when triggered by the thermal release,

Fig. 3

a perspective view of the push button for the circuit breaker, and

4 to 15

different positions of the push button.

The circuit breaker according to FIG. 1, which has the reference number 10 in its entirety is only with respect to the components switch lock, actuating element, thermal and magnetic release and contact point shown. terminals and the extinguishing chamber are not shown for the sake of simplicity.

The circuit breaker has a housing 11 in which a contact point (see below) is used. The housing 11 has the line protection circuit Usual outer contour with a front side 12, from which a formed as a push button 13 Actuator protrudes; the front wall 12 is parallel to the floor surface aligned, which in a known but not shown here a Has recess for snapping onto a top-hat rail. Perpendicular to the Front wall 12 run two side wall sections 14 and 15, which are parallel to the bottom wall or pass over to the front wall sections 16 and 17 which Have openings, not shown, through which the clamping screws of terminals are accessible. Adjoining the wall sections 16 and 17, vertically to the front wall 12 extending side wall sections that are parallel to the side wall sections 14 and 15 run, contain recesses around connecting leads or to clamp busbars under the connection terminals. In that area near the front wall 12, an electromagnetic trigger 18 is used, the The central axis of the coil 19 of the trigger 18 runs approximately parallel to the front wall 12. The Electromagnetic trigger 18 has a striking armature 20 that emerges from the web 21 of a U-shaped yoke 22 which projects a first leg 23 and one has second leg 24, which also run parallel to the front wall 12. The Leg 23 has tabs 25 bent towards the front wall, in which the Axis of rotation 26 of an L-shaped striking lever 27 is mounted. The longer web 28 of the Impact lever runs parallel to the web 21 and overlaps or projects over it, whereas the short web 29, which projects in the same direction from the longer web 28 as the leg 23, the axis of rotation 26 carries. The impact anchor 20 is designed in this way or arranged so that it against the longer leg 28 of the striking lever 27th comes to rest and when triggered or responding about its axis 26 swiveled clockwise.

Extensions 30 are formed on the leg 24 and extend in the longitudinal direction of the coil 19 run and protrude beyond it. A thermal release 34 is on the extension 30 attached in the form of a thermal bimetal. At 31 is an adjustment device for the Thermal bimetal 34 referred to, which is not described here.

The bimetallic strip 34 runs parallel to the longitudinal axis of the coil 19 and projects above it Bridge 21.

In the adjusting device 31, a release lever 36 can be rotated via an axis of rotation 37 stored, which rests with a nose 38 against the bimetal 34 on the side, in which deflects the bimetal 34. A projection 39 is connected to the axis 37, such that when the lever 36 rotates counterclockwise is that the bimetal 34 presses against the nose 38, the projection 39th strikes against a projection 40 which is integrally formed on the leg 28, so that at Rotate the release lever 36 clockwise over the projection 39 of the striking lever 27 is rotated about the axis 26.

The movement of the push button 13 is perpendicular to the front wall 12. The push button has a cylindrical portion 42 in which a blind hole 43 of the side opposite the pressing surface 44 is introduced; in this A blind spring 43 has a compression spring 45.

In the area of the central axis of the push button 13 there is an axis of rotation 46 transversely thereto provided about which a pawl lever 90 is pivotable; due to the assignment of the Compression spring 45 to the axis 46 of the pawl lever 90, this is constantly counter to the Clockwise rotation is applied to return the pawl lever 90 after a release.

An elongated hole 95 is made in the push button 13, which is perpendicular to the front wall 12 and runs in the direction of movement of the push button 13.

The key switch comprises a transmission bracket 60 which with a leg 59 in the slot 95 engages and that with the other leg 61 with the lever arm 62 a contact carrier 63 designed here as a contact shaft is connected, in which a Contact lever 64 is rotatably mounted with the movable contact piece 65. The contact lever 64 also has one on the opposite side of the contact point Actuating arm 66 which, as shown below, is triggered when triggered the pin 67 of a locking arm 68 strikes, so that the locking arm 68 in the drawing Fig. 1 can be moved to the left. The movable contact piece 65 acts with one Fixed contact piece 69 together.

The pawl lever 90 is L-shaped and has a first leg 91 which is parallel to the Direction of movement of the push button 13 extends. He also has a web 92, the is aligned parallel to the front wall 12 and furthermore an extension 93 which complements the latch lever 90 to a U-shape, with the open side of the U-shape to Front wall 12 is executed. The extension 93 acts with the leg 28 of the striking lever 27 together.

On the inside of the leg 91, a nose 94 is formed, and the latch lever 90 is pressed to the right by means of the spring 45; the nose 94 serves as a stop for the leg 59 of the bracket 60, the arm 62 of the contact carrier at the other end 63 is articulated.

If a short-circuit current is now to be switched off, then the impact anchor 20 moved out of the spool 19 to the left and meets the leg 28 of the striking lever there 27 and rotates it about its axis 26. The leg 28 lies against one another the arm 93 of the pawl lever 90 and pivots it counterclockwise, nose 94 exposing leg 59; this leg 59 can in Move elongated hole 95 upward and the bracket 60 is released, this can the contact carrier 63 pivot counterclockwise so that the Switch goes into the open position. Of course, the impact of the Impact anchor 20 over the leg 28 so that the leg 28 against the lever or strikes against the projection 66 of the contact lever and so regardless of the unlatching of the latching point 94, 59 opens the contact lever 64.

The thermal bimetal 34 bends counterclockwise due to an overcurrent and pivots the arm 36 and over the projection 39, the striking lever 27 pivoted clockwise about the axis 26, whereby the pawl lever 90th is pivoted counterclockwise; the switch is released, the bracket 60 is released and moves upward in the slot or slot 95, whereby the contact carrier 63 can go into the switched-off position with the contact lever 64.

The push button 13 is drawn again in FIG. 3 with its cylindrical section 42, the surface lying at the top in the drawing (at 44) being the pressing surface which is not visible. A first projection 114 and a second projection 115 adjoin the opposite circular surface 113 of the cylindrical section 42; the second projection 115 has an approximately rectangular shape and carries a sliding surface arrangement 116 on one of the broad sides. The sliding surface arrangement 116 has a first sliding surface 117 running approximately parallel to the direction of movement of the push button 13 and a second sliding surface 118 running parallel to it, in its region on the pressure surface side are connected to one another via a connection point 119 and also via a connection point 120 on the back surface side. From a reference plane, not shown, which runs parallel to the sliding surfaces or approximately parallel to the sliding surfaces 117, 118, both sliding surfaces 117 and 118 are at different distances: the first sliding surface rises slightly from the connection point 120 to one in the area of the connection point 119 located saddle surface 121, which drops to the actual connection point 119 via a step 122. Via a further step 123, the connecting point 119 drops to the second sliding surface 118, which rises up to the connecting point 120 in relation to this reference plane, so that a third step 124 is provided at the connecting point 120 between the second sliding surface 118 and the first sliding surface 117. over which the second sliding surface 118 drops to the first sliding surface 117. Between the sliding surfaces 118 and 117 there is a dividing wall 125, which is provided with a latching bag 126 on the connection point 119, that is to say the connection point 119 close to the pressing surface. If a nose 135 resiliently transverse to the sliding surfaces 117 and 118 (see below) slides along the sliding surfaces 117 and 118, then it first slides in the direction of the arrow P ₁ (relative movement) on the sliding surface 117 upwards to the saddle surface 121 and slips from there the step 122 on the connection point 119 and in the rest bag 126, whereby the push button 13 is held in the pressed-in position. The connection point 119 of the two sliding surfaces 117 and 118 is closed at the top, i.e. towards the pressure surface side, by a step 127 running perpendicular to it, which extends at an angle of 45 ° to the direction of movement of the push button and merges into step 122, the step 127 or boundary wall 127 runs parallel to the V surface 128 of the rest bag 126 adjacent to the sliding surface 118. If the push button 13 is pushed in further, the locking lug moves in the direction of the arrow P ₂ and is deflected via the step 127 and the further step 123 towards the second sliding surface 118 and then slides on the second sliding surface when the push button slides up again 118 to the second connection point 120 and snaps back onto the first slideway 117 via the step 124. The latching nose is therefore guided on the one hand by the partition 125, the step 127 and a boundary wall 129 running parallel to the partition 125, between which the second sliding surface 118 runs. The boundary wall 129 has in the area of the connection point 120 an arc 130 inclined towards the sliding surface 117. During the movement P ₃ , the locking lug is guided between the boundary wall 129 with the arch 130 and the partition wall 125 on the sliding surface 118.

The locking element (see below) thus makes a movement perpendicular to the reference plane and also a rotation about an axis of rotation that is perpendicular runs to the reference plane. For this purpose, a spring arrangement is provided, which continues is described in more detail below. The reference plane for the slideway 116 runs parallel to the central axis of the cylindrical region 42 of the push button and parallel to Elongated hole 95, the direction of breakthrough of the elongated hole 114 also parallel runs to the reference surface for the slideway 116.

In the projection 115 there is an axially extending bore 133 in which one Compression spring is arranged (not shown), the push button 13 continuously upwards suppressed. The push-in movement is the movement in the direction of arrow E and the push-out movement is the movement in the direction of arrow A. Movement E is manual and the movement A due to the compression spring in the bore 133. Between a space 115a is provided for the two projections 114 and 115, in which the pawl lever 90 is received. The gap 115a begins certain extent into the bore 43 into it, so that part of the ratchet lever 90 also extends into the cylindrical part 42 of the push button 13. To recognize is a transverse bore in the extension 115 which the axis 46 for the pawl lever 90th receives.

4 and 5 show the push button 13 with the sliding surface 117 on which the sliding element 134 or locking element 134 slides along. This locking element 134 has one Nose 135, which runs approximately parallel to the direction of movement of the push button 13 Arm 68 is formed, which is connected to the transverse bolt 67 is; the pin 67 is displaceable in its axial direction, so that the Arm 68 is slidable; in addition, the bolt 67 is also rotatable about its Longitudinal axis, so that the arm 68 is pivotable about the pin axis 67. So that Arm 68 with the nose 135 constantly pressed against the slide assembly 116 is a spring 67a is provided, which is designed as a helical spring and against it Pushing force of the bolts 67 with the locking arm 68, from the actuating arm 66 of the contact lever 64 driven when switching off, is displaceable so that the nose 135 is lifted off the sliding arrangement 116. The spring 67a is with her, the Locking arm 68 remote end mounted stationary. So z. B. with a free trip (see also below) the nose 135 raised above the partition 125 are so that they slide from the sliding surface 117 on the sliding surface 118 and against the boundary wall 129 can come to rest. The spring 67a is with her end near the latch arm with a bend 67b in a receiving hole 68a in the latch arm 68 inserted so that it also serves as a torsion spring for the bolt 67 and the locking arm 68 serves, with which the bolt 67 is acted on so that the nose 135 always counter clockwise on the slide assembly or slideway 116 around the partition 125 runs around when the push button 13 is actuated.

5 shows the locking arm 68 with the locking lug 135 at the second connection point 120. If the push button is pressed in the direction of arrow E, then it slides out 7 can be seen, the locking lug of the locking arm 68 towards the connection point 119 and then, as can be seen from FIGS. 9, 10 and 11, snap in due to the spring 67a the rest bag 126; 10 and 11 show this indented, stable position.

In the position according to FIG. 13 (regardless of the position according to FIG. 12) the Latch 135 slide on the second sliding surface 118 until it, when the push button in Arrow direction A is moved, ends again in the location shown in FIG. 5.

In addition, for better understanding, it is indicated that the axis of rotation 138 Contact shaft 63 is rotatably mounted with the contact lever 64, which is the movable Contact piece 65 and on the opposite side has a stop 66 which bears against the end face of the bolt 67.

4 and 5 show the arrangements in the off position, that is when Push button 13 completely protrudes from the switching device. The detent 135 is located itself at the connection point 120. The movable contact piece 65 is in its Off position. To switch on, push button 13 is pressed in the direction of arrow E, whereby via the bracket 60 (Fig. 1), the contact shaft 63 and the movable contact lever 64 comes into contact with a fixed contact piece 69. The Locking element 135 is still on the sliding surface 117 at a certain distance to the connection point 119. If the push button 13 is pushed in further, then the locking lug 135 is in the area of the connection point 119 in the locking sack 126 snap; can be seen in Fig. 8 that the push button is pressed further than it would be necessary to lock it because there is a distance d between the bottom of the rest bag 126 and the nose 135 is present; if the push button 13 is released, then the push button 13 moves briefly in the direction of arrow A and the bottom of the rest bag 126 lies against the catch 135. This is the switch-on position.

If the switch has tripped, i. H. if the electromagnetic or thermal Release of the circuit breaker has responded, then by release of the bracket 60 of the contact lever 64 come to the off position, the stop 66 moves the pin 67 in the drawing Fig. 12 to the left, so that the latch 135 comes free from the sliding surface 118 and bears against the boundary wall 129. This allows the push button 13 due to the force of the compression spring, not shown, which is arranged in the bore 133, move away in the direction of arrow A. One recognises in Fig. 12 that the boundary wall 129 is selected so that even with the maximum displacement of the locking element 134 away from the sliding surface 118 Latch 135 is still located in the area of the boundary wall 129.

With an electrical circuit breaker it is important that a triggering can take place during the switch-on process, what can be called free tripping is. For this purpose, the locking element is also moved via the movable contact lever 64 whose actuating arm 66 out of the sliding surface 117 against the pressure of the spring 67a pushed out and by the torque of the spring 67a over the partition 125th pressed against the boundary wall 129, causing the push button to lock 13 in the on position and a latching of the switch prevented and is avoided.

Claims (14)

1. Service switching device, in particular a circuit breaker, having one pole and an associated magnetic release (18) and a thermal release (34), a contact point (65, 69), an arcing chamber as well as connecting terminals, in which a push button (13) is provided as the operating element, on which a latching lever (90) is mounted, which can be operated by the thermal release (34) and electromagnetic release (18) and which forms a latching point on the push button with a coupling element (60) which is coupled to a contact lever (64), such that, on unlatching, the contact lever (64) is pivoted to the disconnected position, characterized in that an an [sic] elongated hole (95), which runs in the movement direction of the push button (13), is arranged in the push button (13), in that one end of the coupling element (60) is guided in the elongated hole (95), in that a tab (94) is provided on the latching lever (90) and, together with the coupling element (60), forms the latching point, in that the coupling element (60) is a U-shaped bracket, one of whose limbs (59) is guided in the elongated hole (95), while its other limb (61) is coupled to the contact lever (64), and in that the latching lever (90) interacts with a transmission element (27), which can be operated by the electromagnetic and thermal releases (18, 34) and is in the form of a striking lever.
2. Service switching device according to Claim 1, characterized in that the contact lever (64) is mounted in a contact shaft (63), which is mounted in a fixed position such that it can rotate, passes transversely through the latter, and is coupled to the U-shaped bracket (60) and to the contact shaft (60).
3. Service switching device according to one of Claims 1 or 2, characterized in that the latching lever (90), which is mounted on the push button (13) such that it can rotate, is L-shaped, and has one limb arm (91) which runs approximately parallel to the movement direction of the push button (13), while its other limb arm (92), which runs at right angles to the first limb arm (91), is connected to the striking lever (27).
4. Service switching device according to Claim 3, characterized in that the other limb arm (92) has a projection (93) which projects approximately at right angles to it and forms a U-shape with the first limb arm (91), and in that the projection rests against the striking lever.
5. Service switching device according to Claim 4, characterized in that the projection forms an obtuse angle with the other limb arm.
6. Service switching device according to one of the preceding claims, characterized in that the latching lever (90) is continuously subject to the pressure of a spring (45) in the direction of the striking lever (27).
7. Service switching device according to Claim 6, characterized in that the spring (45) is arranged within the push button (13).
8. Service switching device according to Claim 7, characterized in that the spring is arranged in a blind hole, which is provided in the cylindrical region of the push button.
9. Service switching device according to one of the preceding claims, characterized in that the striking lever (27) covers the impact armature (20) of the electromagnet system, and can be operated by the thermal release, via a respective transmission element.
10. Service switching device according to one of the preceding claims, characterized in that in that [sic] a catch element (134) slides in a sprung manner against a sliding surface arrangement (117, 118), pressing against the push button (13), in that the sliding surface arrangement (117, 118) has two approximately parallel sliding surfaces (117, 118) which run in the movement direction and form a closed sliding path, and between which a separating wall (125) is located, and of which the catch element (134) slides on the first sliding surface (117) when the push button is depressed, and the catch element (134) slides on the second sliding surface (118) when the push button (13) moves out, and in that a catch recess (126) is provided at that connection point which is close to the pressure surface in the sliding path on the separating wall (125), in which catch recess (126) the catch element (134) latches when the push button (13) is pushed in, and holds it in the depressed, second stable position (pushed-in position).
11. Service switching device according to Claim 10, characterized in that the sliding surfaces (117, 118) are at different distances from a reference surface, with a third step (124) from the one to the other sliding surface (118, 117) being provided at the connection point (120) of the sliding surfaces facing away from the pressure surface, which third step (124) prevents the catch element (134) from moving into the second sliding surface when the push button (13) is depressed.
12. Service switching device according to one of the preceding claims, characterized in that the catch element (134) has a catch holding lever (arm 136) with a tab (135) which runs at right angles to it, and can pivot about an axis which runs at right angles to the sliding surface planes, can be moved on the same axis against the pressure of a spring by the moving contact piece (65), and can thus be forced away from the sliding surfaces (117, 118).
13. Service switching device according to Claim 12, characterized in that the catch holding lever (68) is fitted to a holding pin (67), which is mounted such that it can rotate and against whose end face the contact lever (64), to which the moving contact piece (65) is fitted, presses.
14. Service switching device according to Claim 12 or 13, characterized in that the catch holding lever (68) has spring pressure applied to it about the holding pin (67), such that the tab is pressed from the first sliding surface (117) into the catch recess (126), and then once again into the second sliding surface (118).

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