EP3332411B1 - Twin-roll blocking unit for a triggering mechanism for a switching device - Google Patents

Description

The invention relates to a triggering mechanism for a switching device, in particular for low voltage devices and installations, medium voltage devices and installations and / or high voltage devices and installations.

From the state of the art are single joints, for example vacuum contactors, known. In these, a drive lever is pressed via a compression spring in the switch position "off". In order to keep the switching device in the switch position "on" without power, the drive lever is mechanically latched, so locked. For this purpose, a pawl block is attached to the drive lever. In the switch position "on", the drive lever is blocked by a bolt. The bolt is part of a lever, which is held by a spring and the resulting spring force in the latched position. The existing bolt and lever lock can be pulled out of the latched position via a magnetic coil (trigger magnet) and its magnetic field and thus release the drive lever, or the lever and the bolt are mechanically pulled over a rod from the latched position to release the drive lever ,

Such a system allows only very small tolerances in order to avoid unintentional unlatching, ie unlocking the drive lever.

Even small tolerances result in such a system to high friction, in particular between pawl block and bolt.

The US20090201109A1 discloses a trigger mechanism for circuit breakers, with a simple locking mechanism.

From the US2011073446A1 is also known a release mechanism for circuit breakers.

The DE29507811U1 discloses a latching device for a circuit breaker.

Overall, in the known systems for the mechanical release, ie unlatching, high release forces required, for example, in the described embodiment about 100 N.

Also, for the electromagnetic release, or unlatching, high forces are needed, which is why expensive special designs for the release magnets, electromagnets are necessary. The high release forces require a massive construction of the components and strong springs. Also, the lever of the latch must be welded due to the high forces, resulting in a complex manufacturing process.

Since transverse forces occur on the rod for mechanical release, additional storage is necessary to prevent or minimize additional frictional forces.

It is therefore an object of the invention to provide a simpler to manufacture and less expensive trigger mechanism, which simultaneously prevents unwanted unlatching, so triggering, for example by vibration.

This object is solved by the independent claim 1 and the dependent claims.

According to the invention a release mechanism for a switching device, with a drive lever, a mechanical energy storage, which is adapted to act on the drive lever and a locking device is disclosed. The locking device preferably has a first locking element on the drive lever, a lever with a first roller and a second roller, a second locking element and a triggering element. The first roller and the second roller are rotatably mounted on or on the lever.
The second blocking element acts in a locked position on the first roller in such a way that the lever is locked against movement in the direction of the second blocking element, ie also in the direction of the third pivot point, the pivot point of the second blocking element.
The second roller acts on the first blocking element such that the first blocking element prevents movement away from the first blocking element mechanical energy storage or locked to the mechanical energy storage.
The term "locked position" refers to both the lock of the lever against movement in the direction of the second locking element, as well as the lock of the first locking element against movement away from the mechanical energy storage or on the mechanical energy storage. The second blocking element is movable by means of the triggering element such that the second blocking element moves away from the first roller from the locked position and the lever with the first roller and the second roller moves away from the locked position, in which the first blocking element is against movement is away from the mechanical energy storage or locked to the mechanical energy storage, moved away, so that the first locking element can roll over the second roller and the drive lever by the energy stored in the mechanical energy storage away from the mechanical energy storage or on these is or moves can be.

With such a triggering mechanism, it is possible for a switch to be held securely in an "on" position, but quickly and safely translatable to a "off" position by the energy-laden mechanical energy store by unlatching the entanglement by a triggering element, So a lock is released and unlocked.

A triggering mechanism for a switching device in which the mechanical energy store is a spring element, more preferably a compression spring, is preferred.

Also, a trigger mechanism for a switching device is preferred in which the drive lever is rotatably mounted at a first pivot point, and the lever is rotatably mounted at a second pivot point and the second roller between the second pivot point and the first roller is arranged. The second blocking element is rotatably mounted at a third pivot point. The second locking element is located on the side of the third pivot point, which faces away from the first roller and the side which faces the trigger element, on a stop, which is a rotational movement of the side of the second locking element, which faces the first roller in the direction that faces away from the second roll prevents. The second blocking element can be set in a rotational movement by the triggering element in such a way that the side of the second blocking element facing the first roller moves away from the first roller and toward the second roller, viewed from the third pivot point, and also on the second roller moved further past the second roller, so that the lever moves in the direction of the third pivot point, and the first locking element rolls over the second roller and so releases the first locking element, so that the drive lever by the compression spring or the mechanical energy storage in a rotational movement about the first pivot point is offset.

Also preferred is a triggering mechanism for a switching device, wherein the second blocking element is biased by a torsion spring with a mechanical force.

Another embodiment is a triggering mechanism for a switching device, wherein the second locking element is additionally secured by a torsion spring with a mechanical force against rotation and in a unlocked position causes a restoring force on the locking element in the direction of the locked position, wherein the unlocked position is characterized thereby in that the lever is not locked against movement in the direction of the second blocking element and that the first blocking element is not blocked against movement away from the mechanical energy store or onto the mechanical energy store.

Also preferred is a triggering mechanism for a switching device, wherein the second roller is offset from the first roller in the direction of the drive lever on the lever.

Also, a trigger mechanism for a switching device is preferred, wherein the second locking element in the locked position, on the side facing away from the first roller, by 0.2 ° to 0.5 ° against a vertical axis, ie the long axis of the second locking element in vertical Alignment, tilted towards the stop. In other words, the axis of the pawl and / or the second locking element is in the locked position, in which the pawl and / or the second locking element abuts the stop, tilted by 0.2 ° to 0.5 ° in such a way that the side of the locking element, which faces away from the first roller from the third pivot point, is rotated in the direction of the second roller. In particular, the axis against which the second blocking element is tilted can also be formed by the axis through the third pivot point and the pivot point of the first roller.

Also preferred is a trigger mechanism for a switching device, wherein the edges of the second locking element, which face in the locked position of the first roller, are rounded.

In a further embodiment, the first roller and the second roller have different diameters.

Also, a triggering mechanism for a switching device is preferred in which the triggering element is a triggering magnet, in particular an electromagnet or a coil, in particular a magnetic coil.

Also preferred is a triggering mechanism for a switching device, wherein the triggering magnet is both mechanically and electrically actuated.

Further preferred is a triggering mechanism for a switching device, in which the force required to trigger the mechanical unlocking via the triggering element to the second blocking element is less than 50N, preferably less than 30N, preferably less than 25N, more preferably 20N (+/-) 2N.

In a further embodiment of a triggering mechanism for a switching device, the second blocking element is a pawl or half-wave.

Figur 1:

Schnittansicht einer Verklinkung aus dem Stand der Technik

Figur 2:

Schematische Zeichnung der Hebel und Kräfte für eine Verklinkung gemäß Figur 1

Figur 3:

Schnitt durch eine erfindungsgemäße Verklinkung und Auslösevorrichtung

Figur 4:

Schematische Darstellung der Verklinkung und Auslösung und der Hebelarme gemäß Figur 3

Figur 5:

Schematische Darstellung der Verkippung des zweiten Sperrelementes.

In the following, the subject invention will be explained in more detail with reference to individual figures and figures:

FIG. 1:

Sectional view of a latch of the prior art

FIG. 2:

Schematic drawing of the levers and forces for a latch according to FIG. 1

FIG. 3:

Section through a latch according to the invention and tripping device

FIG. 4:

Schematic representation of the latching and tripping and the lever arms according to FIG. 3

FIG. 5:

Schematic representation of the tilting of the second blocking element.

The FIG. 1 shows a latch and the associated release mechanism from the prior art, for example, the 3TLG Siemens vacuum contactor. The drive lever 2 with the pivot point of the drive lever 1 is pressed via a compression spring 5 in the direction of the switching position "off". To keep the drive lever 2 and thus the switching device in the switching position "on", the drive lever 2 is mechanically latched.

This latching takes place via a latch block 8 fastened to the drive lever 2. This latch block 8 is blocked by the bolt 12 in the switch position "on".

The bolt 12 is part of the lever 3, wherein the lever 3 is held by means of the spring force of the torsion spring 6 in the latched position.

For unlatching, so to trigger the switch, so that it can get into the switch position "off", either the solenoid 7 is energized, the magnetic field of the solenoid 7 pulls the lever 3 from the latched position, thus releasing the drive lever 2, or the lever 3 is pulled mechanically out of the locking position by the rod 10, so that the bolt 12 in turn releases the pawl block 8 and thus the lever 3.

The rod 10 is guided to reduce undesirable forces in a bearing 11.

Also shown is a shim 9 below the solenoid.

The FIG. 2 shows in the upper portion of the schematic and basic structure of the tripping device according to the prior art.

The drive lever 20 is rotatably supported at the pivot point of the drive lever 1. The compression spring 50 engages the drive lever 20. The drive lever 20 is held by the bolt 120 in the "on" position, provided that the switch is in the latched switch position "on".

The bolt 120 is mounted on the lever 30 and the lever 30 is rotatably mounted at the pivot point 40, and by the torsion spring 60, the lever is held in the latched position, or pressed into this.

The lever 30 can be moved out of the locked position either by means of the rod 100 or the solenoid 70, so that the drive lever 20 is released and can be moved by the compression spring 50.

The lower part of the FIG. 2 also shows the drive lever 20 in the locked position, showing the lever arm of the bolt 130, the lever arm of the spool 140, the lever arm of the rod 150, and the lateral force 160.

The FIG. 3 shows a section through a trigger mechanism according to the invention. The drive lever 112 is rotatably supported at a pivot point of the drive lever 111. In the switching position "on", the drive lever 112 is locked by the second roller 1110 via the first blocking element 1116, which may be designed as a pawl, with respect to a movement away from the mechanical energy store, here a compression spring 115. The locking element 1116 is fixedly connected to the drive lever 112. The second roller 1110 is rotatably mounted on the lever 113. The lever 113 itself is rotatably supported at the fulcrum of the lever 113, the second fulcrum 114.

In the locked position, that is, in the latched switch position "on" of the switch, the lever 113 is prevented from moving from the first blocking element 1116 via the first roller 1111 rotatably mounted on the lever 113 by a second blocking element 118. The second blocking element 118 is located below the third pivot point 119, on which the second blocking element 118 is rotatably mounted, and on the side, which faces the pivot point of the lever 113, ie the second pivot point 114, against a stop 1119. The stop 1119 can in principle (not shown here) also above the third pivot point 119, on which the second locking element 118 is rotatably mounted, and on the side of the second locking element 118, the pivot point of the lever 113, ie the second pivot point 114, facing away , be provided.

For triggering or unlatching, the triggering element 117 can either mechanically or electronically set the second blocking element 118 in motion or rotation. By this movement, the second locking member 118 is moved away from the first roller 1111 and thus releases the lever 113. In particular, the end of the second locking member 118 facing the first roller 1111 may move away from the first roller 1111 and onto the second roller 1110 and, if necessary, may also move past the second roller 1110. The released lever 113 is moved in the direction of the second locking member 118 and thus allows the rolling of the first locking member 1116 via the second roller 1110 of the lever 113. The thus released, unlatched or unlocked drive lever 112 can now by the mechanical energy storage 115, here a compression spring 115 are rotated about the pivot point of the drive lever 111 and so move the switch in an "off" position.

A torsion spring 116 at the pivot point of the second locking element 118, so the third pivot point 119, causes the second locking element 118 is rotated back into the latched or locked position in the event of a transfer of the switch in the "on" position, which the lever 113 for Locking the first locking element 1116 enabled or moved.

The upper part of the FIG. 4 schematically shows the structure of FIG. 3 , The drive lever 112 is rotatably mounted at the pivot point of the drive lever 111. The drive lever 112 is locked by the second roller 1110 and the spring 115 is prevented from pressing the drive lever 112 from the locked position. The second roller 1110 is connected via the lever arm 113 'to the pivot point of the lever 113, ie the second pivot point 114. On the lever 113, the first roller 1111 is fixed, and the lever 113 is prevented by the second Sperrlemente 118, which acts on the first roller 1111, from moving in the direction of the second locking member 118. The second locking element 118 is rotatable with the compression spring 116 and the pivot point of the second locking element 118, the third pivot 119, rotatably mounted. The triggering element 117 is provided such that it can engage the second blocking element 118 and can release the lever 113 and thus the drive lever 112 via an initiated rotational movement of the second blocking element 118.

In the lower part of the FIG. 4 the lever arms are shown on the side of the lever 113 and the second locking member 118. The lever arm 1113 of the first roller 1111 and the lever arm 1112 of the second roller 1110 are also characterized as the lever arm 1114 of the second locking member 118 and the lever arm 1115 of the trigger member 117th

The FIG. 5 shows a schematic diagram of the latched state of the second locking element 118, which is tilted or "overstretched" for self-locking by 0.2 ° to 0.5 °. Shown are the axis 1121 of the lever 113 and the pivot point of the lever 113, that is, the second pivot point 114, and the first roller 1111, which is held by the second locking element 118 in the latched or latched position. The second locking element 118 is tilted at the third pivot point 119 of the second locking element 118 such that a self-locking results. This self-locking is achieved by the fulcrum of the first roller 1111 is located on an axis with the third pivot 119 of the second locking member 118, and the stop 1119 of the second locking member 118 is provided so that in the latched position, the axis of the pawl 0.2 ° to 0.5 ° with respect to the common axis of the first roller 1111 and the third pivot 119 of the second locking member 118 is rotated. The rotation takes place on the side of the second locking member 118 from the third pivot 119, which faces the first roller 1111, in the direction opposite to the pivot point 114 of the lever 113. Shown is also the force vector 1130, which results from the twist and is responsible for the self-locking, that is, "hyperextension".

LIST OF REFERENCE NUMBERS

1

Fulcrum of the drive lever 2

2, 20

drive lever

3

lever

4, 30

Pivot point of the lever

5, 50

mechanical energy storage, spring, compression spring

6, 60

torsion spring

7, 70

solenoid

8th

jack block

9

Shim

10, 100

pole

11

warehouse

12, 120

bolt

130

Lever arm of the bolt

140

Lever arm solenoid

150

Lever arm rod

160

lateral force

111

Fulcrum of the drive lever 112, first fulcrum

112

drive lever

113

lever

114

Fulcrum of the lever 113, second fulcrum

115

mechanical energy storage, spring, compression spring

116

Torsion spring at the pivot point of lever 113

117

Release element, release magnet, electromagnet

118

second locking element, pawl

119

Fulcrum of the second blocking element, third fulcrum

1110

second role

1111

first role

1112

Lever arm of the first roll

1113

Lever arm of the second roller

1114

Lever arm of the second locking element, the pawl

1115

Lever arm of the trigger element

1116

first blocking element

1119

Stop of the second locking element, the pawl

1120

Axle of the second locking element, the pawl

1130

resulting force vector

A

Tilting by 0.2 ° to 0.5 °, overstretching for self-locking

B

Direction for the mechanical release, unlatching

Claims (13)

1. Triggering mechanism for a switching device, having a drive lever (112),
   a mechanical energy storage unit (115), which is suitable for acting on the drive lever (112), and a blocking means, wherein
   the blocking means has a first blocking element (1116) on the drive lever (112), characterized in that the blocking means has a lever (113) with a first roller (1111) and a second roller (1110), a second blocking element (118) and a triggering element (117), wherein
   the first roller (1111) and the second roller (1110) are mounted in a rotatable manner on the lever (113),
   the second blocking element (118), in a locked position, acts on the first roller (1111) such that the lever (113) is blocked against moving in the direction of the second blocking element (118),
   the second roller (1110) acts on the first blocking element (1116) such that the first blocking element (1116) is blocked against moving away from the mechanical energy storage unit (115) or in the direction of the mechanical energy storage unit (115), and wherein
   the second blocking element (118) can be moved by means of the triggering element (117) such that the second blocking element (118) moves away, out of the locked position, from the first roller (1111) and the lever (113) with the first roller (1111) and the second roller (1110) moves away out of the locked position, in which the first blocking element (1116) is blocked against moving away from the mechanical energy storage unit (115) or in the direction of the mechanical energy storage unit (115), and therefore the first blocking element (1116) rolls over the second roller (1110) and the drive lever (112) is moved, by the energy stored in the mechanical energy storage unit (115), away from the mechanical energy storage unit (115) or in the direction of the same.
2. Triggering mechanism for a switching device according to Claim 1,
   characterized in that
   the mechanical energy storage unit (115) is a compression spring (115).
3. Triggering mechanism for a switching device according to Claim 1 or 2,
   characterized in that
   the drive lever (112) is mounted in a rotatable manner at a first point of rotation (111), and wherein
   the lever (113) is mounted in a rotatable manner at a second point of rotation (114) and the second roller (1110) is arranged between the second point of rotation (114) and the first roller (1111), wherein
   the second blocking element (118) is mounted in a rotatable manner at a third point of rotation (119), wherein,
   on that side of the third point of rotation (119) which is directed away from the first roller (1111), the second blocking element (118) butts against a stop which prevents that side of the second blocking element (118) which is directed toward the first roller (1111) from rotating in the direction away from the second roller (1110), wherein the second blocking element (118) can be made to rotate by the triggering element (117) such that that side of the second blocking element (118) which is directed toward the first roller (1111) moves away from the first roller (1111) and moves in the direction of the second roller (1110), and therefore the lever (113) moves in the direction of the third point of rotation (119), and
   the first blocking element (1116) rolls over the second roller (1110) and thus frees the first blocking element (1116), it therefore being possible for the drive lever (112) to be caused to rotate, by the compression spring the mechanical energy storage unit (115), about the first point of rotation (111).
4. Triggering mechanism for a switching device according to one of the preceding claims,
   characterized in that
   the second blocking element (118) is prestressed by a mechanical force by way of a rotary spring (116).
5. Triggering mechanism for a switching device according to one of Claims 1 to 3,
   characterized in that
   the second blocking element (118) is additionally secured against rotation by a mechanical force by way of a rotary spring (116) and, in an unlocked position, subjects the blocking element (118) to a restoring force in the direction of the locked position, wherein the unlocked position is distinguished in that the lever (113) is not blocked against moving in the direction of the second blocking element (1118), and in that the first blocking element (1116) is not blocked against moving away from the mechanical energy storage unit (115) or in the direction of the mechanical energy storage unit (115).
6. Triggering mechanism for a switching device according to one of the preceding claims,
   characterized in that
   the second roller (1110) is offset on the lever (113) in the direction of the drive lever (112), as seen in relation to the first roller (1111).
7. Triggering mechanism for a switching device according to one of Claims 3 to 6,
   characterized in that,
   in the locked position, the second blocking element (118), on the side directed away from the first roller (1111), has been tilted in the direction of the stop (1119) by 0.2° to 0.5° in relation to a vertical axis.
8. Triggering mechanism for a switching device according to one of the preceding claims,
   characterized in that
   those edges of the second blocking element (118) which are directed toward the locked position of the first roller (1111) are rounded.
9. Triggering mechanism for a switching device according to one of the preceding claims,
   characterized in that
   the first roller (1111) and second roller (1110) have different diameters.
10. Triggering mechanism for a switching device according to one of the preceding claims,
    characterized in that
    the triggering element (117) is a triggering magnet (117), in particular an electromagnet.
11. Triggering mechanism for a switching device according to Claim 10,
    characterized in that
    the triggering magnet (117) can be actuated both mechanically and electrically.
12. Triggering mechanism for a switching device according to Claim 11,
    characterized in that
    the necessary force for triggering the mechanical unlocking of the second blocking element (118) via the triggering element (117) is smaller than 50N, preferably smaller than 30N, preferably smaller than 25N, and is further preferably 20N (+/-) 2N.
13. Triggering mechanism for a switching device according to one of the preceding claims,
    characterized in that
    the second blocking element (118) is a latch (118) or half-shaft.

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