FR2514196A1 - DEVICE FOR ACTUATING AN ELECTRIC CIRCUIT BREAKER - Google Patents

Abstract

THE TRIPPING DEVICE FOR A CIRCUIT BREAKER INCLUDES A 12 HANGING ON ROLLERS 16, 18 OF A TRIPPING HOOK 10. BETWEEN THE ROLLERS 16, 18 IS INSERTED A TAB 26, WHICH IN THE UNLOCKED POSITION AUTHORIZES MOVEMENT BY BEARING OF THE ROLLERS 16, 18, TOWARDS THE RELEASE POSITION OF THE HOOK 10 UNDER THE ACTION OF THE LOCKING FORCE.

Description

DEVICE FOR TRIGGERING AN ELECTRIC CIRCUIT BREAKER.

  The invention relates to a device for tripping an electric circuit breaker having a spring and hook mechanism, capable of being locked in position

  armed by a roller hook, in which said hook

  chet has a hooking surface cooperating in posi-

  lation with one of the rollers of a pair of

  rollers of said roller hook, the other roller co-

  operating with a fixed bearing surface and in which one-

  hooking tongue is inserted between the two rollers to move said rollers into position by rolling

  release hook by sliding-tongue.

  A triggering device of the kind mentioned uses locking devices or rollers with displacement by

  bearing, that is to say with low friction These increases

  roller chairs are capable of resuming reactions

  important without requiring a significant force to unlock

  rusting and are particularly suitable for circuit breakers

  heavy gauge using heavy duty springs

  load-bearing The tongue inserted between the two attachment rollers transmits by sliding a movement of

  roller bearing without any sliding friction.

  In previously known devices of this type, the tongue is positively controlled, for example by a

  electromagnet and to minimize the compaction force

  the whole is arranged so that the reactions

  rollers are exerted perpendicular to the tongue.

  Theoretically, the sliding force of the tongue is then independent of the reaction forces, which at the same time avoids any untimely unlocking under the action of these forces. Known systems frequently exhibit failures which can be attributed to bonding or matting of surfaces. in contact This bonding brakes or

  prevents tripping of the circuit breaker with the

  disastrous consequences that we know.

  The object of the present invention is to remedy this drawback

  comes and is characterized in that said latching is arranged to derive from the latching force of the hook on the rollers a sliding force of the latching tongue in the direction of release of the hook to achieve self-unlocking of the latching and that the latching tongue cooperates in the locked latching position, with a fixed stop preventing the sliding of the latching tongue, a release lever

  being likely to rotate the tab

  chage to break the cooperation between the tongue and

  stop and allow self-unlocking of the latching.

  The displacement force of the tongue is no longer provided by the lever or the release member, but it is derived from the hooking force of the hook and is all the greater as the bearing force and this the risk of sticking are significant The trigger lever acts transversely on the tongue and it will come out of

  the description below that micro-displacements in

  the bearing areas of the rollers, generated by this displacement-

  transverse tongue, break the bonding forces and initiate the sliding movement of the tongue.

  Avoid any untimely triggering, especially

  under the effect of shocks, and according to a development of

  the invention, the tongue inserted between the rollers

  picking is requested in the locking position by the

  hooking force of the hook on the rollers This self-

  locking implies a higher unlocking force

  higher, which can easily be kept within limits

acceptable.

  The rollers, which can be balls or any other body of revolution, are advantageously mounted in a

  cage, biased in the locking position by a spring

  comes out As soon as the hook is released, the rollers automatically return to the locking position, as does the tongue also subjected to a return spring.

  when resetting the circuit breaker, the hook pushes back the

  the rollers actually come to catch on, and during this operation the unloaded rollers slide easily

  on the tongue and the support.

  Other advantages and characteristics of the invention res

  will emerge more clearly from the description which follows

  an implementation mode, given by way of example not

  limiting and shown in the accompanying drawings, in the-

what

  Figure 1 is an elevational and sectional view of an ac-

  roller hooking according to the invention, shown in posi-

  locking tion; Figures 2 and 3 are views similar to Figure 1, showing the hooking respectively in progress and at the end

unlocking; -

  Figure 4 is a section along the line IV-IV of Figure 1; FIG. 5 is a partial view, on an enlarged scale, of

Figure 1.

  In the figures, a hook 10 of a mechanism (not shown

  felt) of an electric circuit breaker cooperates with an

  roller chage, designated by general reference-12 The circuit breaker can be of the molded case type having a

  manual operating handle and an automatic trigger

  tick on fault Such circuit breakers are well known to specialists under the trade name COMPACT, and they include an energy storage spring (not shown) for opening the contacts during

  release of the hook 10 under the action of the trigger.

  In the armed or closed position of the circuit breaker, the beak-shaped end 14 of the hook 10 abuts against a roller 16, lower in the figures, of a pair of rollers 16, 18 - superposed mounted in a holding cage 20 The roller upper 18 is supported on a support surface 22 of a fixed support 24, and the roller assembly 16, 18, cage 20 is

  mounted with limited sliding in the fixed support 24 paral-

  along the support surface 22 Between the rollers 16, 18 is inserted the end of a catching tongue 26, which extends substantially parallel to the support surface 22 passing through the cage 20 The end opposite 28 of the

  hooking tongue 26 cooperates, in the position of ver-

  rusting, with a stop plate 30 of the fixed support 24, preventing sliding of the tongue 26 to the right in the figures A trigger lever 32, mounted for rotation on an axis 34, strikes; when triggered, the end 28 to lift the latter above the edge of the stop plate 30 and unlock the tab

  26, which can then slide freely.

  The hooking force of the hook 10 is transmitted by the

  lower roller 16, tongue 26 and upper roller

  18 to the fixed support 24 Referring more particularly

  Lier in Figure 5, we see that the bearing surface 22 is slightly inclined to form with the surface 36 of the spout 14 a corner with low anal and that the gripping force

  of the hook 10 tends to drive the rollers 16, 18 outwards

  laughing from this corner to the right in the figures When the tongue 26 is locked, any displacement by sliding of the rollers 16, 18 is made impossible by the high friction forces of the rollers on the tongue 26 held fixed and on the surfaces of support 22, 36 When the tongue 26 is unlocked the rollers 16, 18 can roll by imposing on the tongue 26 a

  double displacement to the right in the directions indicated

  quées' by the arrows in the figures The rolling friction is very low, even in the presence of a high latching force It is easy to choose the angle of the

  bearing surfaces 22, 36 to have a force of

  locking, derived from the gripping force, sufficient to move the roller assembly 16, 18 by rotation, tongue 26 for self-unlocking of the hook 10, but insufficient for sliding movement The spout 14 escapes after a predetermined displacement of the rollers 16, 18 to the right - and the released hook 10 pivots towards the release position, the cage 20 and the support 24 of course having a groove 38 of

passage of the hook 10 (FIG. 4).

  The tongue 26, clamped between the rollers 16, 18, is urged by this clamping force to a position perpendicular to the line O 0102 of the centers of the rollers 16, 18, which corresponds to the locking position of

  tongue 26 In FIG. 5, the tongue 26 tends to pi.

  vote clockwise while pressing release lever 32 and stop plate 30 Li locking position is a stable position avoiding

any untimely triggering.

  When triggering the trigger lever 32 fat rotate the tab 26 in the opposite direction of the needle E of a watch in the figures to lift the end 2 E above the edge of the stop plate 30 and - unlocking the tongue 26 During this pivoting the points B 1, B 2 of contact of the rollers 16, 18 and of the tongue 26 are modified, which breaks the bonding forces and initiates the self-unlocking by rolling of the rollers 16, 18 to the right These displacement of the con points

  tact B 1, B 2 are very weak but sufficient to eliminate

  ner any risk of blocking the catch The lever

  trigger 32 must overcome sliding friction

  ment of the end 28 on the stop plate 30 and the centering force imposed by the rollers 16, 18, but

  these forces are easily maltri-sable and can even

will be reduced.

  A return spring 40 fixed to the axis 34 and to the tongue 26 pulls the latter in the locked position and a

  spring 42, interposed between a stop 44 carried by the lan-

  watches 26 and the cage 20, requests the latter in posi-

  hooking tion. The device operates as follows In the attachment position shown in FIG. 1, the attachment force of the hook 10 is taken up by the support

  fixed 24 by means of rollers 16, 18 All

  placement by rolling of the rollers 16, 18 is prevented by the tongue 26 abutting the stop plate 30 The slight inclination of the surface 36 of the spout 14 of the hook 10 generates a component in the direction of sliding of the tongue 26 towards the unlocking position, which is taken up by the stop plate 30 In the event of a fault, the

  trigger causes pivoting clockwise

  plate of the trigger lever 32, which strikes the end 28 of the tongue 26 In a first phase the tongue 26 pivots (Figure 2) and as soon as the end

  28 escapes from the stop plate 30, the tab 26 covers

  smooth, in a second phase, towards the unlocking position

  rusting under the action of the aforementioned component During this second phase the rollers 16, 18 roll in

  moving in the direction of the tongue 26 for release

  rer the hook 10 (figure 3) - As soon as the hook is released, the springs 40, 42 remind the tongue 26 and the

  rollers 16, 18 in the hanging position (Figure 1).

  When resetting the hook 10 pivots in the opposite direction and in the passage pushes the rollers 16, 18, which are unloaded,

  to the right, before coming to hang in the posi-

tion shown in Figure 1.

  assembly is simple and reliable and allows a control of important fastening forces essential in the

high rating circuit breakers.

7:

  The invention is of course by no means limited to

  tails of achievement described above, but it extends

to all variants -

-14196

Claims (4)

Claims   1 Tripping device for an electric circuit breaker   having a spring and hook mechanism (10), susceptible   ble to be locked in the armed position by an attachment (12) to rollers (16, 18 Y, in which said hook (10)   has a hooking surface (36), cooperating in position   locking with one of the rollers (16) of a   pair of rollers (16, 18) of said attachment (12) to wheel   leaux, the other roller (18) cooperating with a fixed support surface (22) and in which a hooking tab   (26) is inserted between the two rollers (16, 18) to   rolling said rollers (16, 18) into position   release hook (10) by sliding the lan-   lookout (26), characterized in that said latching is arranged to derive from the latching force of the hook (10) on the rollers (16, 18) a sliding force   of the hooking tab (26) in the direction-of release   tion of the hook (10) to achieve self-unlocking of the latching (12) and that the latching tongue (26) cooperates in the latched latching position with a fixed stop (30) preventing the tongue from sliding ( 26) for hooking, a trigger lever (32) being capable of pivoting the tongue (26) for hooking to break the cooperation between the tongue (26) and   the stop (30) and allow the lock to self-unlock chage (12).   2 trip device according to claim 1, characterized in that the hooking surface (36) of the hook (10) and the surface (22) of fixed support form an acute angle tending to drive out the pair of rollers ( 16, 18),   sandwiched between the two surfaces, in the unlocked position   rusting. 3 trigger device according to claim 1 or 2, characterized in that the trigger lever (32) imposes a pivoting movement of the tongue (26)   hooking escaping the stop tab (30).   4 release device according to claim 3, characterized in that the rollers (16, 18) and the tab (26) of the latch (12) are arranged to derive from the latching force of the hook (10) a force holding the tongue (26) in the locked position capable of being overcome by an antagonistic force exerted by the   release lever (32) on the tongue (26).   Trigger device according to any one of   claims 1 to 4, characterized in that said pair   rollers (16, 18) is mounted in a cage (20)   seated by the end of the tongue (26) and urged in the hooking position by a spring (42) and that said hooking tongue (26) is urged in the rusted worm position by a return spring (40) to bring back all elements of the roller hook (12) in position   active as soon as the hook is released.