EP1284494A2 - Latch mechanism for a circuit breaker, particularly for a protective switch for a motor - Google Patents

Abstract

Two levers (30,33) lie in parallel and perpendicular to the direction of force of a release device. A third lever (43) is rotatably fixed at one end, and forms a latching point at its other end with the second lever. An articulated lever is formed from an intermediate lever jointed to the third lever and a link (52) whose free end is linearly guided and coupled to a moving part of a contact. The linear guide extends perpendicular to the direction of motion of the release device.

Description

The invention relates to a switch lock for an electrical switching device according to the Preamble of claim 1.

Electrical switching devices have u. a. a contact point arrangement with a fixed and a movable contact piece arrangement, a thermal and / or an electromagnetic release and a key switch, on the one hand with the or the triggers and on the other hand together with the movable contact piece arrangement acts. In the event of a trip, a ratchet mechanism is released from the trigger unlatches, and the contact opening usually takes place via a toggle lever system, which in Connection with further levers and tabs on the movement of the key switch transfers the contact pieces and opens them permanently. The toggle system is through an actuating element via a translatory movement (push button), via a Rotating or tilting movement (rotary knob, shift lever) moves and into an over-center position brought. This movement of the toggle system, which is usually An energy store is tensioned via the clinker mechanism. This pawl mechanism acts on transmission parts and thus on the contact point arrangement. When it is switched on, it is closed via the key switch and opened when switched off. The latch mechanism is triggered unlatched by overriding the support of a jack so that the toggle lever system can collapse. The key switch acts on the collapse of the toggle lever system due to the spring force in an opening manner. When the actuator is automatically returned to the original position (Off position) the clinker mechanism is activated again, so that the Switch lock can be switched on again. The key switch can hold trigger the actuator in the on position unaffected. With contact welding the actuator must not get into the out position and the operator show a contact opening.

A switch lock with rotary drive is known from EP 0 612 089 A2. Via the control panel is a deflection of the axis of rotation via two rotatably mounted parts with bevel gear reached by 90 °. The second swiveling part with bevel gear contains a banana-shaped one Recess that moves the toggle. By supporting the The energy accumulator becomes a toggle lever on a pawl when the key switch is switched on tensioned with two compression springs and via a lever mechanism with contact carrier part the contact apparatus is closed or the device is switched on. When switching off the switching mechanism is released from the switching mechanism via a sliding mechanism, so that the opening of the contact point arrangement or switching off suddenly he follows.

With this arrangement, there are a large number of parts, so that the manufacturing cost are high. There is also a 90 ° deflection twice to close the contact or contact opening. Because when you turn it off The key switch is released via a sliding mechanism, the load on the latching point, which consists of a metal / plastic combination (change from On / Off), large and so-called snapping can occur early.

From DE 42 01 026 A1 a switch lock has become known, which both can be switched on by pressing a button or via a rotary actuator. The Switch lock is switched on via a rocker, which is a lever of the knee lever system is. This rocker is switched on by a button and by another Key to switch the key switch moved. The rocker is used for the rotary drive by turning the axis of rotation by 90 ° using additional parts. By the movement of the toggle lever system beyond a dead center position tensions this Toggle lever system via a transmission lever the energy accumulator, which via an additional lever acts on the plunger and closes the contact pieces. Switching off takes place not erratic because there is no snap mechanism for the switch-off process is. The speed of the contact opening is therefore slowed down and as a result due to the longer exposure to arcing, the erosion of the contact pieces increases.

The object of the invention is to provide a switch lock of the type mentioned, in which the number of parts is reduced compared to the known arrangements and also the mechanical load and thus the wear of the Switch lock can be reduced. In addition, the arrangement is said to be a snap mechanism act especially when switching off, so that switching off erratic he follows.

This object is achieved according to the invention by the features of claim 1.

According to the invention, the switch lock has a first lever on its one End rotatably mounted, a second lever with one end the other end of the second lever is rotatably connected and part of the latching point forms, with both levers approximately parallel to each other and approximately perpendicular to the direction of force of the trigger, and the other end in the area of fixed bearing of the first lever is mounted on a bracket, and a third lever, which is rotatably mounted at one end and the other End forms the other part of the latching point. Furthermore, is according to the invention a toggle lever arrangement of an intermediate lever articulated on the third lever and a tab, the free end of which is guided linearly and with the movable part of the contact point is coupled, the linear guide approximately perpendicular to the direction of force of the Trigger runs, provided.

The main advantage of this arrangement is that the number of parts reduced and the wear of the individual parts is also reduced, so that the risk of so-called snap-through no longer exists.

According to an advantageous embodiment of the invention, an interlocking point and the trigger can be provided with a rotatably mounted connecting element, that in the locked state the first and thus the second lever in the latching point holds and when triggered the second lever to open the latch releases.

The connecting element can be permanently held in the direction of retention by means of a spring be charged.

According to a further embodiment, there is a holding surface on the connecting element molded on, which cooperates with a support surface on the first lever in the switched-on position, when released, however, comes free from the support surface and releases the first lever.

It is also provided that the other end of the second lever with his one end articulated bracket at its other end resilient against a stop is pressed and thus a movable fulcrum for the first and second Lever forms.

According to a further embodiment, the tab at the end at which it is connected the intermediate lever is connected, have a nose with a projection on Bracket interacts so that when the tab is pivoted, the bracket pivoted.

Further advantageous refinements and improvements of the invention are the others See subclaims.

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

Fig. 1 bis 5

eine Einsicht in ein Schaltschloß in unterschiedlichen Stellungen,

Fig. 6

eine perspektivische Darstellung eines Schaltschloßträgers in einem Motorschutzschalter,

Fig. 7 und 8

die Übertragung der Bewegung des Schaltschlosses auf eine Doppelkontaktstelle in Aus- und Einschaltstellung und

Fig. 9

eine Drehknopfsteuerung zur Übertragung der Drehwegegung eines Drehknopfes auf das Schaltschloß

Show it:

1 to 5

an insight into a switch lock in different positions,

Fig. 6

1 shows a perspective illustration of a switch lock carrier in a motor protection switch,

7 and 8

the transmission of the movement of the key switch to a double contact point in the off and on position and

Fig. 9

a rotary control for transferring the rotational position of a rotary knob to the key switch

Reference is now made to FIG. 8.

Fig. 8 shows a switch 10 from the side, the output at 11 with a first arm 12 of an L-shaped rotary lever 13 is coupled, the second arm 14 acts on a contact carrier 15, on which a contact bridge 16 is attached, the carries two movable contact pieces 17 and 18. The movable contact pieces 17 and 18 cooperate with fixed contact pieces 19 and 20 on arc guide rails 21, 22 are attached. The arc guide rails 21, 22 do not limit Arc bundle sheet packets shown in detail and are used to the fixed Contact piece 19 or 20 arising arc base in the arc quenching plate package respectively.

The L-shaped rotary lever is movably and rotatably mounted at 23; the first arm is 12 acted upon by a compression spring 24 such that the pressure spring 24 the rotary lever tries to pivot clockwise in the direction of switching off, so that the second arm 14 can hit a shoulder 25 on the contact carrier 15 as soon as the switch lock has released the first arm 12. Fig. 7 shows the off position: The Compression spring 24 has pivoted the rotary lever so that the second arm 14 on the paragraph 25 open and the contact carrier 15 together with the contact bridge 16 in Could bring off position.

The switch lock 10 is, as can be seen from FIG. 6, received in a switch lock carrier 26. It has a receiving space 27 in which the switching lock is inserted.

Reference is now made to FIGS. 1 to 5.

Fig. 1 shows the switch lock in the on position. It has a first lever 30 which has an approximately banana-shaped contour and fixed at one end at 31 is rotatably mounted. The other end of the first lever 30 is via a joint 32 hingedly connected to a second lever 33, which partially covers the first lever 30. On this second lever 33 there is a nose 34, which is shown in further below described forms part of a latching point. The other end of the second lever is rotatably supported at 35 with an approximately U-shaped control lever 36, the other end of which is pressed by a compression spring 37 against a projection 37a becomes. The two levers 30 and 33 run approximately parallel to one another. On the nose 34 opposite side of the first lever 30, a support lug 38 is formed, which is supported against a support surface 39 of a rotatably mounted rotating part 40, which rotating part 40 has an attack area 41 on which a thermal or can attack electromagnetic trigger element and the rotary member 40 clockwise pivoted. About a double leg spring 42, the rotating part 40 is opposite Turned clockwise, so that when the triggering ends in the in Fig. 1st drawn position can be moved back.

The switch lock also has a third lever 43, which is bent approximately L-shaped and its first leg 44 on the diametrically opposite to the rotating part 49 Side is rotatably mounted at 45. This first leg 44 runs approximately parallel to the first and the second lever 30, 33. perpendicular to the first leg 44 is a second leg 46 connected, the free end of a support surface 47 for the nose 34 forms. A toggle lever arrangement is articulated approximately in the middle of the second leg 46 48 connected with two tabs 49 and 52, the first tab 49 articulated with its free end at 50 on the second leg 46 and with its other End at 51 is hinged to the second tab 52. Shown in Fig. 1 Position (latching position), the first and second tabs 49, 52 run approximately parallel to the first leg 44 and to the first and second levers 30 and 33, wherein the hinge point 51 on the side of a connecting line facing the hinge point 45 between the hinge point 50 on the second leg 43 and the support point 53, on the tab 52 and the support point 53a (FIG. 6) on the housing 26. When the tabs 49 and 52 are aligned, a dead center position has been reached; Fig. 1 shows the position in the so-called first stable and latched position. In other words, the first and second levers form in the latched position 30, 33 with the control lever 36 a U-shape, through the tabs 49, 48 to a E-shape is added. The nose 34 and the support surface 47 are approximately in the Middle of the so-called leg of the U-shape, which is formed from the two levers 30, 33 becomes. The control lever 36 connects to the "free end" of the lever 30, 33rd formed so-called thighs.

A compression spring 54 acts on the first leg 44, and the third lever 43 acts clockwise wants to pivot and in this way the two tabs 49 and 52 in the so-called first stable position holds. On the second tab 52 there is a nose projection 55 molded on, in the manner shown below with a corresponding Nose projection 56 cooperates on control lever 36, see below.

The key switch accordingly has two latching points, namely the latching point 38/39 and the latching point 34/47.

Fig. 2 shows the switch lock in a release position, in which the latching point 38 and 39 is unlatched, because a force in the direction of arrow P, ie, on the attack area 41 acted approximately parallel to the second leg 46 and approximately perpendicular to the levers 30, 33 Has. As a result, the first lever 30 is released and due to the compression spring 37 pivoted about the control lever 36 and the second lever 33, so that the second Latching point 34 and 47 is released; this allows the third lever 43 pivot counterclockwise, thus giving the toggle lever assembly 48 free so that it can move into the second stable position, see Fig. 3, wherein the support point 53 can move in the direction which is then parallel to the first Leg 44 runs in the direction of the second leg 46.

The movement of the support point 53 acts on the rotary movement of a rotary knob, as shown below.

At the pivot point 51, a pin (with the same reference number) is formed, which in a Setting 60 engages on a rotary knob or rotary actuator 61. About these When the trigger 60 is triggered, the rotary knob 61 is pivoted or turned on the one hand and when switching on the toggle lever arrangement 48 from the switching off, see Fig. 4 in the switch-on position, see Fig. 1.

To switch off, the rotary knob acts on the link on the joint 51, whereby the Tab 48 is moved against the direction of arrow A (Fig. 2). It presses the nose 55 on the tab 48 on the nose 56 of the control lever 36 and rotates it so that it pivots clockwise around the support point on the projection 37a. Thereby the second lever 33 is taken along and the latching point 34/47 is released, so that the switch can turn off.

Claims (12)

Switch lock for an electrical switching device, in particular for a motor protection switch, the input of which is coupled to a thermal or electromagnetic release and the output of which is coupled to the movable part of a contact point, with a latching point which can be released from the release, and with a switching handle with which the Unlatching latching point for switching off and latching for switching on,
marked by a first lever (30) which is rotatably mounted at one end (31), a second lever (33) which is rotatably connected at one end to the other end of the first lever (30) (at 32) and forms part of the latching point, the two levers (30, 33) being approximately parallel to one another and approximately perpendicular to the Direction of force (P) of the trigger, and the other end of which is mounted on a control bracket (36) in the area of the fixed bearing of the first lever. a third lever (43) which is rotatably mounted at one end (at 45) and forms the other part of the latching point at the other end, and a toggle lever arrangement (48) consisting of an intermediate lever (49) articulated on the third lever (43) and a tab (52), the free end of which is linearly guided and coupled to the movable part of the contact point (18, 20; 17, 19), wherein the linear guide runs approximately perpendicular to the direction of movement of the trigger. Switch lock according to claim 1, characterized in that a rotatably mounted connecting element (40) is provided between the clinker point (34, 47) and the trigger, which in the clinker state the first (30) and thus also the second lever (32) in Holds latching position and releases the first lever for opening the latch when triggered. Switch lock according to claim 2, characterized in that the latching element (40) is continuously acted upon by a spring (42) in the direction in which the connecting element (40) acts on the first lever (33) in the latching position. Switch lock according to claim 2 or 3, characterized in that a support surface (39) is provided on the connecting element (40), which cooperates with a support lug (38) on the first lever (30) in the switched-on position and thus forms a further latching point, but when triggered comes free from the support nose and releases the first lever (30). Switch lock according to one of the preceding claims, that at the other end of the second lever (33) with one end articulated control lever (36) on his the other end is resiliently pressed against a stationary stop (37a) and thus one movable pivot point for the first and second lever forms. Switch lock according to one of the preceding claims, characterized in that the tab (52) at the end at which it has a nose projection (55) with the intermediate lever (49) which cooperates with a projection (56) on the control bracket (36), so that when the tab (52) is pivoted, the control bracket (36) also pivots. Switch lock according to one of the preceding claims, characterized in that the third lever (43) is L-shaped with a first leg (44) which runs approximately parallel to the dead center line of the tabs (52, 49) and whose free end (at 45) is rotatable is fixed in position, and is formed with a second leg (46) which extends approximately perpendicular to the dead center line and forms a part of the latching point with a free end. Switch lock according to Claim 7, characterized in that a spring (54) acts on the first leg (44), which springs the third lever (43) in the direction of the latching point (34, 47) and thus the toggle lever arrangement in its locked first stable position (switch-on position, see Fig. 1) acted upon. Switch lock according to one of the preceding claims, characterized in that a pin (51) is formed on the hinge axis of the toggle lever arrangement (48) and is guided in a cam or link groove (60) on the switching handle (61) designed as a rotary handle. Switch lock according to claim 9, characterized in that the link (60) forms a Z-shape. Switch lock according to one of Claims 9 and 10, characterized in that that between the two parallel sections of the backdrop (60) a circular arc Section runs, the center of which is the center of rotation of the Handle is. Switch lock according to one of the preceding claims, characterized in that the rotary handle is mounted so that the parallel sections run in the direction of the movement of the movable part of the contact point.

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