WO1994017545A1

WO1994017545A1 - Line safety switch

Info

Publication number: WO1994017545A1
Application number: PCT/AT1993/000184
Authority: WO
Inventors: Alfred Nyzner
Original assignee: Felten & Guilleaume Austria Ag
Priority date: 1993-01-21
Filing date: 1993-12-06
Publication date: 1994-08-04
Also published as: SI9400025A; EP0680661B1; AU5370494A; DK0680661T3; GR3023492T3; AT404769B; NO952722D0; HRP940032A2; ATE150208T1; AU672843B2; HRP940032B1; EP0680661A1; TR28256A; NO307068B1; DE59305821D1; ATA9093A; ES2100663T3; NO952722L

Abstract

In a line safety switch with a break section (6, 41) equipped with a bimetallic release device and a magnetic release device (4), a switch latch (1) with a switching toggle (15) is associated to a swivelling switching bridge (2). The switching bridge (2) may be swivelled by means of the switching toggle (15) out of an OFF position apart from the fixed contacts (6) into an ON position in which it lies on the fixed contacts (6). The switching toggle (15) is coupled to the movable switching bridge (31) by an articulated joint which consists of a hoop (30) and a bracket (31). The leg of the hoop (30) linked to the bracket (31) is guided in a slotted guiding part (50, 51) whereas the other leg of the hoop (39) is joined to the switching toggle (15) in an articulated manner. The guiding slot (50) is provided in a ratchet (51) swivellingly mounted in the switch latch (1). The ratchet (51) can snap into a ratchet support (50) with its end (51') opposite to the swivelling point (24). The ratchet support (60) which is associated to the bimetallic release device (5) and to the magnetic release device (4), is swivellingly (23) mounted in the switch latch (1). The guiding slot of the guiding part (50) extends over part of its length in a substantially parallel direction to the sliding direction of the bracket (31). The leg of the hoop (30) received in the guiding slotted part (50, 51) is received in the ON position in a part (50') of the slot (50) which extends away from the switching toggle (15) and the switching toggle (15) takes together with the hoop (30) an over dead centre position.

Description

Line protection switch

The invention relates to a circuit breaker with a switch equipped with a bimetallic and magnetic release and with a pivotable switching bridge which is coupled to a switching knob, the switching bridge with the help of the switching knob from the at least one fixed contact to the OFF position in a at the Fixed contact adjacent ON position is pivotable.

From DE-A-24 17 286 a circuit breaker ("overcurrent switch") is known in which an elongated hole is provided in a switch-off lever which is concentrically curved with respect to its pivot axis. In the slot there is a hook bolt, which is guided with its ends in straight slots in the housing of the switch. The hooking bolt interacts with a switch lever which is pivotally mounted in the switch and which has a hook at one end. The other end of the hooking bolt is assigned to the magnetic release and the bimetallic release of the known circuit breaker.

The invention is based on the object of further developing a line circuit breaker of the type mentioned above in such a way that the switching operations are improved with regard to the movement of the components of the line circuit breaker without impairing its tripping properties.

According to the invention, this object is achieved in that the switch toggle is connected to the movable switching bridge by means of a bracket and a bracket, that the arm of the bracket connected to the bracket is guided in a slot guide, that the other arm of the bracket is connected to the Switch toggle is connected that the slot of the slot guide is provided in a pawl pivotally mounted in the switch lock, which can be locked at its end opposite the pivot point with a pawl support, that the pawl support pivotally mounted in the switch lock is assigned the bimetal and magnet release, that the slot angled - la - and consists of a part which runs essentially parallel to the direction of displacement of the tab and consists of a part which is inclined to the direction of movement of the tab, extends away from the switching knob, and that the leg of the bracket received in the slot in the ON position in the part of the slot extending away from the switching knob.

Preferred and advantageous embodiments of the switch according to the invention are the subject of the dependent claims.

An embodiment of the circuit breaker according to the invention is described in detail below by way of example with reference to the attached drawings. It shows:

1 the circuit breaker according to the invention with the front housing shell removed, in the ON position,

2 the switch when triggered,

3 shows the switch in the OFF position,

4 seen the switch lock of the circuit breaker from the side (the one lock plate is removed),

5 the switching lock from FIG. 4 seen from below,

6 shows the switch lock from FIGS. 4 and 5 during the switch-on process,

Fig. 7 in section the shift knob with its spring holder and

Fig. 8, the movable switching bridge and its tabs.

In the exemplary embodiment shown, the circuit breaker is of single-pole design. However, it can also be designed with up to four poles for nominal currents from 63 to 125 A.

The circuit breaker has a housing, of which only one housing half-shell is shown in the drawings. - 2 -

In the housing there is a switch lock 1, on which the switching bridge 2 is pivotally mounted about a pivot axis 3 that can be pivoted in the switch lock 1, a magnetic release 4, on the support of which the bimetal release and adjacent fixed contacts 6 are also mounted, and an arc extinguishing device, consisting of a deion chamber with an arc quenching chamber 8 and blow-off openings 9, which lead outside into the housing.

Furthermore, the terminals 10 and 11 are placed in the housing, the terminal 10 being electrically conductively connected to the component 4 carrying the magnet trigger. The terminal 11 is electrically conductively connected to the lower (not visible in the drawing) fixed contact.

The two fixed contacts 6 are electrically connected in the ON position by the switching bridge 2.

Each fixed contact 6 is assigned its own deion chamber 7 and its own arc quenching chamber 8, the two arc quenching devices being arranged separately from one another and being magnetically insulated from one another by a dividing wall (not shown) made of egg plate.

The magnetic release 4 interacts via a lever 12 mounted on it in a manner to be described, with the switch lock 1 for triggering the line protection switch. The free end of the bimetallic release also interacts with switch lock 1 to trigger the circuit breaker.

The magnetic trigger 4 is adjusted via an armature spring 13 accommodated in it (see FIG. 2). To adjust the bimetallic release 5, an adjusting screw 14 is provided, which is accessible from the outside through an opening in the housing.

In the circuit breaker according to the invention there is

Switch on and trigger (swiveling the movable

Switch bridge 2 in the ON position shown in Fig. 1 or i the OFF position shown in Fig. 3) always via the switching - - Locked 1, regardless of whether it is switched off via the bimetallic release 5 or the magnetic release 4 or with the help of the switching knob 15 provided in the switch lock 1. On the other hand, the switch-on always takes place with the help of the switching knob 15 via the switching lock 1, in that the switching knob 15 is pivoted.

The switching lock 1 shown in FIGS. 4 and 5, including the movable switching bridge 2 pivotably mounted on it, is designed as an independent component which can be used in the housing when the line circuit breaker according to the invention is assembled.

The switching lock 1 consists of two lock plates 20 and 21 which are connected to one another via the pivot axes 3, 22, 23 and 24. The switch toggle 15 is pivotally mounted on the pivot axis 22 of the switching lock 1.

The shift knob 15 consists of two parts, namely the actual shift knob 15 and two spring holders 25, which are pivoted on the axis 22 coaxially to the shift knob 15. The switch toggle 15 is loaded by a button spring 26 into its pivot position corresponding to the OFF position shown in FIG. 3. For this purpose, one leg of the spring 26 is supported on the one lock plate 21 and the other leg on the end 27 'of a spring 27 which passes through the spring holder 25.

The spring holder 25 (two spring holders 25 are provided in the exemplary embodiment shown, see FIG. 7) is braced by two spring springs 27, which are accommodated in the interior of the switching knob 15, with respect to the switching knob 15, so that the spring holder 25 with respect to the switching knob 15 are pivotable against the force of these springs 27. This is of importance for the jump switching to be described which can be implemented in the circuit breaker according to the invention.

In the switching lock 1 provided in the line circuit breaker according to the invention, the switching toggle 15 is over its two Spring holder 25, coupled via a bracket 30, a tab 31 and a switching bridge tab 32 to the movable switching bridge 2.

In detail, the essentially U-shaped bracket 30 is inserted with one of its legs in holes 33 of the two spring holders 25 and engages with its other leg in an opening 29 of the tab 31.

The tab 31 is coupled to the switching bridge tab 32 via a joint 34. The switching bridge tab 32 has two mutually parallel parts 35 which are connected to one another via a web 36. The switching bridge tab 32, like the movable switching bridge 2, can be pivoted about the axis 3 rotatably inserted in the switching lock. Two contact springs 37 are inserted over the axis 3, the legs of which are supported on the one hand on the movable switching bridge 2 and on the other hand on the switching bridge tab 32.

One leg 35 of the switching bridge tab 32 also carries an extension 38, into which a tear spring 39 is suspended, the other end of which is suspended in an extension 40 which is formed in one piece with the lock plate 21.

Due to the described construction of the arrangement of the switching bridge tab 32 and the movable switching bridge 2, the switching bridge tab 32 can pivot at the end of the switching-on process (movement of the movable switching bridge 2 from the OFF position into the ON position) with respect to the moving switching bridge 2, so that the latter is pressed under the action of the two contact springs 37 with their two contact ends 41 against both contacts 6 fixed to the housing.

The leg of the bracket 30 coupled with the tab 31 is guided in a backdrop (slot guide). This backdrop is formed by slots 50 in the two legs of a pawl 51. The pawl 51 is pivotally mounted in the switching lock 1 about the axis 24, the two legs of the pawl 51 being connected by a web 52. - -

In order to prevent the two legs of the bracket 30 from approaching one another under the action of the switch-on forces and the contact forces, a support tab 53 is provided, the ends of which are associated with holes in the leg of the bracket 30, which is coupled to the tab 31, through which the said leg of the bracket 30 engages. At the other end, the two parts of the support bracket 53 running parallel to one another have a recess into which the other leg of the bracket 30 engages.

The end of the pawl 51 facing away from the pivot axis 24 is assigned to a pawl support 60. The pawl support 60 is pivotally mounted in the switch lock 1 about the axis 23 and is loaded by a tension spring 61 onto the pawl 51 or the tab 31. In the ON position shown in FIG. 1 (or in the position ready to be switched on), the free end 51 ′ of the pawl 51 is latched to the pawl support 60 in that a shoulder 62 of the pawl 51 on a shoulder 63 of the pawl support 60 lies on.

Furthermore, two projections 64 and 65 are provided on the pawl support 60, which are assigned on the one hand to the lever 12 of the magnetic release 4 and on the other hand to the free end of the bimetal release 5. When the components mentioned address the pawl support 60 is pivoted counterclockwise and releases the pawl 51.

In the switch lock 1, a catch 70 is also pivotally mounted about the axis 24, which is under the action of a spring 71, which loads it clockwise (FIG. 4).

The leg of the bracket 30, which is coupled via the bores 33 to the spring holders 25 of the shift knob 15, runs into a recess 76 of the detent 70 when the shift knob 15 moves clockwise from the position shown in FIG. 3 into the position shown in FIG. 6 shown position is pivoted. When the switching knob 15 is moved further (clockwise), its spring holders 25 are pivoted with increasing tension in the spring springs 27. An attachment 72 is provided on the switching toggle 15, which on the catch 70 in the region of a recess 73 provided in it - 6 - comes up when the leg of the bracket 30 coupled to the tab 31 is approximately in the area of the slot 50 of the slot guide in the pawl 51, where it extends from a part which runs essentially parallel to the direction of displacement of the tab 31 in the direction of the The pivot axis 22 of the shift knob 15 passes away part (approximately the position shown in FIG. 6).

In the case of the circuit breaker described, the switching operation takes place via the switching lock 1. The switching toggle 15 actuates the switching bridge 2, which is driven via the tab 31 and the switching bridge tab 32, via the bracket 30 guided in the link (slot 50 in the pawl 51) and which Contacts 41 are pressed onto the contacts 6. The latching mechanism of the switch lock 1 according to the invention consists of the latch support 60 with its shoulder 63 and the latch 51 engaging in this with its shoulder 62.

It is triggered either by the bimetal 5 heated and bent by an overcurrent or by the lever 12 which is moved by the plunger over the armature of the magnetic release 4 when a short-circuit current flows through the coil of the magnetic release 4.

In the switching lock 1 according to the invention, the triggering process can take place independently of the position or any blocking of the switching knob 15 (free triggering).

In the ON position of the line circuit breaker according to the invention, the pawl 51 has engaged with its shoulder 62, which is provided on a web connecting the two parallel parts of the pawl 51 and protrudes therefrom, into the shoulder 63 of the pawl support 60. The position of the switching toggle 15 is achieved and maintained by exceeding the dead center of the joint which is formed from the spring holders 25 (bores 33) and the bracket 30.

The movable switching bridge 2 is moved over the bridge tab 32 and the tab 31 and in the direction away from the switching toggle 5. - 7 - Send part of the slot 50 in the pawl 4 locked legs of the bracket 30 tensioned. In this position, the tear spring 39 is tensioned and pulls the switching bridge 2 away from the fixed contacts 6 at the moment of triggering.

In the ON position, both contact springs 37 are also tensioned in order to build up the contact pressure. An uneven contact erosion can be compensated for in the circuit breaker according to the invention by a larger bearing hole (play of the same with respect to the axis 3) in the bearing bracket 2 'of the movable switching bridge 2 and the symmetrically arranged contact springs 37.

In the case of the circuit breaker according to the invention, it is also possible to provide a contact position indicator 80 which is visible from the outside through a viewing window 81 in the housing, the red field of the contact position indicator 80 being visible from the outside in the ON position shown in FIG. 1.

When the line circuit breaker according to the invention is triggered, starting from the ON position shown in FIG. 1, the pawl support 60 is pivoted either by the bimetal 5 or by the lever 12 against the force of the spring 61 and the pawl 51 is unlocked, so that the angled one Parts 50 'of the slots 50 of the legs of the bracket 30 are moved out of these parts 50' and the movable switching bridge 2, driven by the tear spring 39, is pivoted into the OFF position shown in FIG. 2. The leg of the bracket 30 received in the slots 50 of the pawl 51 moves into the end of the slots 50 of the pawl 51 that is distant from the axis 24 about which the pawl 51 is pivotally mounted.

If the release takes place by means of the magnetic release 4, the movable switching bridge 2 is additionally pressed open in a driven manner by the plunger of the magnetic release 4, thus preventing the contacts 41 and 6 from welding.

If the movable switching bridge 2 is nevertheless welded to the fixed contacts 6, the red field of the contacts - 8 - cycle position indicator 80 visible in the viewing window 81 in the housing of the circuit breaker.

If the circuit breaker is in the OFF position (contacts open), the pawl 51 is raised above the bracket 30 by the switching knob 15, which is pressed into the OFF position by the spring 26 loading it, and is ready to hook into the shoulder 63 of the pawl support 60 when it is pivoted back under the action of the spring 61.

The tear-open spring 39 is also (somewhat) tensioned in this position in order to keep the movable switching bridge 2 in the OFF position.

The pawl support 60 is pressed by the force of the spring 61 against the shoulder 62 of the pawl 51 in order to be ready for the latching.

In the viewing window 81, the green field of the contact position indicator 80 indicating the OFF position is visible from the outside.

In the case of the circuit breaker according to the invention with the switch lock described, the function of the snap-on switch is as follows:

The switch toggle 15 is pivoted clockwise (FIG. 1) when it is switched on until the leg of the bracket 30 coupled to the tab 31 bears against the catch 70. As a result, the tab 31, the switching bridge tab 32 and thus the movable switching bridge 2 are prevented from moving further, even if the switching knob 15 is pivoted further (position FIG. 6). In this position, the contact ends 41 of the movable switching bridge 2 are approximately 1 mm in front of the fixed contacts 6 and, regardless of the continued movement of the switching knob 15, do not move any further.

When the switching knob 15 is pivoted further, the spring springs 26 which are already biased are tensioned even further until the attachment 72 of the switching knob 15 on the catch 70 in its - 9 -

Recess 73 runs up and the catch 70 lifts. At this moment, the initially blocked switching bridge 2, with the spring force that is supplied by the spring springs 26, abruptly abuts with its two contacts 41 into contact with the fixed contacts 6 via the tab 31 and the switching bridge tab 32, and the switch is closed.

In summary, the invention can be represented as follows, for example:

In the case of a line circuit breaker with a switching path 6, 41 equipped with a bimetallic release and magnetic release 4, a switch lock 1 with a switching knob 15 is assigned to a pivotable switching bridge 2. The switching bridge 2 can be pivoted with the help of the switching knob 15 from the OFF position spaced apart from fixed contacts 6 into an ON position adjacent to the fixed contacts 6. The switching knob 15 is connected to the movable switching bridge 2 via an articulated connection consisting of a bracket 30 and a tab 31. The leg of the bracket 30 connected to the tab 31 is guided in a slot guide 50, 51, whereas the other leg of the bracket 30 is articulated to the switching knob 15. The slot guide 50 is provided in a pawl 51 which is pivotally mounted in the switching lock 1 and which can be latched to a pawl rest 60 at its end 51 'opposite the pivot point 24. The pawl support 60, which is assigned the bimetallic release 5 and the magnetic release 4, is pivotally mounted 23 in the switching lock 1. The slot 50 of the slot guide extends over a part of its length essentially parallel to the direction of displacement of the tab 31. The leg of the bracket 30 received in the slot guide 50, 51 is in the ON position in a part 50 'running away from the switching knob 15. of the slot 50 is added and the switch toggle 15 assumes a dead center position with the bracket 30.

Claims

- 10 - Claims:

1. Miniature circuit breaker with a switch (1) equipped with a bimetallic and magnetic release (4) and with a pivotable switching bridge (2) which is coupled to a switching lever (15), the switching bridge (2) using the Switch toggle (15) can be pivoted from the OFF position, which is at a distance from at least one fixed contact (6), into an ON position, which is in contact with the fixed contact (6), characterized in that the switch toggle (15) has a bracket (30) and a tab (31) with the movable switching bridge (2) is connected so that the leg of the bracket (30) connected to the tab (31) is guided in a slot guide (50, 51) that the other leg of the Bracket (30) is connected to the switching knob (15) that the slot (50) of the slot guide is provided in a pawl (51) which is pivotably mounted in the switching lock (1) and is located at its end ( 51 ') with a clin kenauflage (60) can be locked that the pawl support (60) mounted in the switch lock (1) pivotably (23) is assigned the bimetal (5) and magnetic release (4), that the slot (50) is angled and consists of a part which runs essentially parallel to the direction of displacement of the tab (31), and consists of a part (50 ') which is inclined to the direction of displacement of the tab (31), extends away from the switching knob (15), and that Legs of the bracket (30) received in the slot (50) in the ON position are received in the part (50 ') of the slot (50) which extends away from the switching knob (15).

2. Switch according to claim 1, characterized in that between the pawl support (60) and the switching mechanism (1) a the pawl support (60) in their position of the pawl (51) approaching tension spring (61) is tensioned.

3. Switch according to claim 1 or 2, characterized in that the pawl (51) has two mutually parallel legs which are connected to one another by a web (52), and that slots (50) in both legs. - 11 - are provided for receiving one leg of the bracket (30).

4. Switch according to claim 3, characterized in that the pawl (51) over in its two legs on the

Jack support (60) opposite end provided

Holes about a switch lock-fixed axis (24) is pivotally mounted.

5. Switch according to one of claims 1 to 4, characterized gekenn¬ characterized in that the tab (31) with the movable Schalt¬ bridge (2) is coupled via a switching bridge tab (32) which about the pivot axis (3) of the switching bridge ( 2) is pivotally mounted and with which the switching bridge (2) is coupled by at least one contact spring (37).

6. Switch according to one of claims 1 to 5, characterized gekenn¬ characterized in that between the legs of the bracket (30) which connects the switching knob (15) with the tab (31), one connecting the two legs of the bracket (30) Stirrup support (53) is provided.

7. Switch according to claim 6, characterized in that the bracket support (53) has two mutually parallel, interconnected legs.

8. Switch according to claim 6 or 7, characterized in that the bracket support (53) has at one end a recess in which one leg of the bracket (30) is received, and that the bracket support (53) at the other end one-sided has open recess into which the other leg of the bracket (30) engages.

9. Switch according to one of claims 1 to 8, characterized in that the bracket (30) with the switching knob (15) via at least one relative to the switching knob (15) against spring force pivotable spring holder (25) is verbun¬ that A detent (70) which is pivotably mounted in the switch lock (1) is provided, on which the leg of the bracket (30) connected to the tab (31) during movement - 12 - runs towards the switching knob (15) from the OFF position into the ON position, and that an extension (72) is provided on the switching knob (15), which is attached to the catch (70) towards the end of the pivoting of the switching knob ( 15) runs into its position corresponding to the ON position in the sense of a pivoting of the catch (70) which releases the bracket (30).

10. Switch according to claim 9, characterized in that the detent (70) in the switch lock (1) about the same axis (24) is pivotally mounted as the pawl (51).

11. Switch according to claim 9 or 10, characterized in that the detent (70) is under the action of a spring (71), which loads it in its one leg of the bracket (30) assigned pivot position, and that in the switch lock

(1) an extension (75) is provided which limits the pivoting of the catch (70) in one direction and cooperates with an extension (74) on the catch (70).

12. Switch according to one of claims 1 to 11, characterized ge indicates that the pivotable switching bridge (2) has two contact surfaces (41) which are assigned to two fixed contacts (6), and that the pivoting switching bridge

(2) is pivotably mounted on an axis (3) fastened between two mutually parallel lock plates (20, 21) of the switch lock (1) via a bearing tongue (2 ') arranged symmetrically to the pivotable switching bridge (2).

13. Switch according to claim 12, characterized in that on both sides of the bearing tongue (2 ') contact springs (37) are seen, the one leg on the ver¬ pivotable switching bridge (2) and with its other leg on the Switch bridge tab (32).

14. Switch according to one of claims 6 to 13, characterized in that the switching bridge tab (32) has two mutually parallel legs (35) which between them the end of the tab (31) assigned to the pivotable switching bridge (2) take up. - 13 -

15. Switch according to claim 9, characterized in that the extension (72) of the switching knob (15) on the catch (70) runs up when the leg (30) coupled to the bracket (30) is in the Area of the transition between the part (50 ') of the slot (50) of the slot guide (51) which runs essentially parallel to the direction of displacement of the tab (31) and the part (50') extending away from the switching knob (15).