FR2518797A1 - ELECTRIC SWITCH WITH CLICK - Google Patents

Abstract

THE INVENTION RELATES TO AN ELECTRICAL CLICK SWITCH. IN THIS SWITCH CARRYING FIXED CONTACTS 11, 12 JOINT TO A UNIT 1 AND A MOBILE CONTACT BRIDGE 15 EQUIPPED WITH PLATFORMS BEARING CONTACTS, A TRIGGER SERVING AS A DRIVE UNIT 25 AND DECLIC SPRINGS 19, 20 ON EACH SIDE OF THE BRIDGE, SIDE-TO-SIDE TWIN CONTACTS ARE PROVIDED FOR EACH SIDE OF THE BRIDGE 15, POINT-OF-TIME APPLICATION ZONES OF DECLICK SPRINGS ON OPPOSITE SIDES OF THE ACTUATOR, AND REINFORCEMENT AT REVOLUTION SYMETRY HOUSED IN THE FREE END OF THE ACTUATOR 25 NEXT TO THE CONTACT BRIDGE 15 WHICH IS FLEXIBLE. APPLICATION ESPECIALLY TO HIGH RELIABILITY SNAP-ON ELECTRIC SWITCHES.

Description

A 25 18797-

ELECTRICAL INTERRURPTOR WITH CLICK.

  The invention relates to a snap-on electric switch consisting of at least one pair of contacts

  fixed, fixed to the casing, a movable contact bridge comprising

  both of the contact platforms made by molding on both ends with at least one contact on each platform, as well as a pusher trigger acting as an actuating member, on both sides of which are arranged the fixed contacts, actuating member serving simultaneously as support for the contact bridge

  moved by snapping into

  with a double interruption, while on each side of the contact bridge a snap-on spring is provided, one edge of which is carried, in the manner of a knife support, on the contact bridge or between superposed contact members. and whose other opposite edge is supported in

  a recess formed in the actuating member.

  The snap switch with the organs of -lii-

  sound that are worn, in the manner of a knife stand,

  both on the contact platforms and on the orga-

  actuation, has the disadvantage that the mobile system of the contact bridge forms with the actuating member a relatively rigid system which has

  only one degree of freedom, namely according to the direc-

  In the course of switching loads which frequently decrease in the direction of the ranges of m V and m A, for requirements simultaneously increasing from the point of view of reliability in relation to the contact resistance, it is advantageous to equip the various

  contact areas with twin contacts.

  Since, in parallel with the growing requirements,

  In terms of reliability and contact, the requirements for the accuracy of the switching time also increase and therefore a further adjustment is required at

  replacement of the snap switch in

  2 'tions having fixed predetermined switching times, it is now necessary-to have opportunities to make this adjustment on the switching members to click from the outside, that is to say without removing elements of the boot-and similar parts.

  In the case of snap switches of the type indicated

  above, there are two fundamental principles, one of which uses resilient contact bridges and rigid connecting members (between the contact platform and the actuating member) and the other of which implements rigid contact bridges and organs

elastic connection.

  German Patent No. 975 831 discloses snap switches having an elastic contact bridge. German Pat. No. 17 65 712 discloses a snap switch having two resilient contact bridges, which is thus a inverter for two circuits A snap switch having one or two rigid contact bridges and elastic linkages is known from the German patent application

published under No. 28 17 815.

  The common point, in the technique represented

  in these documents is the fact that

  the respective contacts for the rest contact function and for the contact function of

  in the case of construction on a bridge, and only

  contact for each contact zone in the case

  of the two-point realization A doubling of the zones of con-

  tact with so-called twinned contacts is not provided in the existing two-position case made in the manner of a knife holder, snap springs or rigid connecting members in the case of the German patent. 65 712 But since switches

  identical snapshots must also be equipped with

  used to make an imposed opening, in accordance with

M 251879

  to the requirement of the VDE 0660 requirement (according to

  what is to be understood by the term of switches with imposed opening, switches whose contact parts are reliably separated during the connection at least over a portion of the actuating stroke without the interposed mounting of elastic members of drive), elastic contact bridges, that is to say having a spring action, separate in the direction of the

  closing and opening movement of the contacts.

  Doubling contacts with contacts

  twinned houses had until now required special constructions

  of the type described in British Patent No

  593 948 Separation, which is necessary in this

  the contact system with respect to the rebound system, however, entails significant disadvantages with regard to the reliability of the contact in the case of

  low actuation speeds as was explained

  ETZ, volume 101 (1980), notebook 4,

pages 220 and 221.

  A snap switch known from the patent

  British company No. 088083 is equipped with two

  electrically separated from each other and each carried in the manner of a knife support Each contact bridge is associated with two pairs of contacts

  In order to guarantee here a safe establishment of

  tact, the points of support of the contact bridges can have a game such that they can equilibrate

  contact areas of the contact bridge carrying out a -

  interruption come into application It is not pre-

  seen and it is also not possible with this solution indicated, to equip the individual zone

  contacts with twin contacts closing in parallel

the the.

  According to the patent filed in the United States of America

  that under No. 2 571 453 a switch is known to de-

  click which has an elastic contact bridge provided with

  The purpose of this switch is to satisfy

  With a simple modification, the requirements of a large number of switching problems However, paired contacts are also not provided here and a forced opening can not be imagined in the sense of the

German prescription VDE 0660.

  Another snap switch, known from US Patent No. 4,216,358, is also provided with an elastic contact bridge which cooperates with two fixed contact torques and in which

  the contact bridge has an interrup-

  It should be noted in particular that the contacts

  soldered are broken during actuation In order to

  this fact, fixed contacts facing each other are dis-

  They are placed on pivoting plates which can be dragged by driving members arranged on the actuating member. Welded contacts then roll on one another until the weld point breaks. provision is made for increasing the reliability of contact by means of

twinned contacts.

  Another type of forced order is obtained,

  in a snap switch known from the application

  of a German patent placed under Public Inspection under

  N 1 935 225, thanks to the fact that a pivoting lever

  dragged by a cam of the actuating member acts on an elastic contact bridge; The movable contact bridge is discharged by means of this lever arm to the extent that it does not appear only a flexion of the contact bridge. Here too, no provision is provided to increase the reliability of the contact. known from the patent application

  published under No. 2 613 555, a contact to be

  which also switches reliably in the case of a minimum actuating stroke. For this purpose a spring formed by a wire stirrup is mounted as a compression spring so as to be pivotable between a shaped groove. wedge of a fork contact lever and a wedge-shaped groove of the actuating member.

  In this way, a simple changeover contact is created.

  which can be controlled by different organs of

  A double break is not planned and we can not identify the possibility of doing the zo

  individual contact in the form of a contact

melé.

  In all the achievements mentioned above,

  snap switches, none of them showed

  in addition, a device for adjusting the instant of

  mutation, that is to say the instant of the click or click

  The German patent application No. 29 13 913 simply indicates a possibility relative to this subject. But since it is a switch

  in which the contact system is separated

  mechanism, this principle does not have a

  optimal for the reasons already mentioned above.

  of contact security in the case of speed

slow actuation.

  In addition, the adjustment of the click point is not possible

  only when the housing is removed or in the case of the presence of a corresponding opening in the housing. The present invention, starting from the switch

  known from the German patent application

  under No. 9 2817 815, is intended to increase the

  of the contact in such a device and to provide support for the contact bridge in such a way that the latter is

  freely mobile and that all points of contact apply

  with as few differences as possible from

contact, against the fixed contacts.

  The problem is solved according to the invention

  thanks to the fact that twinned contacts are planned

  side-by-side on each side of the contact bridge, transversely

  relative to the longitudinal axis of the latter, that

  The snap spring springs are provided on opposite sides of the actuating member, opposite each other, than on the end.

  free of the actuating member, close to the bridge of con-

  tact, is provided a recess symmetry of revolution in said actuating member and that the contact bridge

is in itself flexible.

  In the case of twin contacts, this gives the contact system the ability to swing around

  the position of the fixed contacts Small differences

  In addition, four points of support can be compensated for by contact bridges.

  certainly massive, but arranged in the system of con-

  tact so as to be easily flexed A form

  particularly preferred embodiment of the

  tual, from the point of view of a rigid fixation in the space of the oen

  oscillation and a lateral exit, thus

  caught, of the contact bridge system, is characterized by

  the fact that the section of the actuator, on the-

  the linkage is resting, is carried out with asymmetry of revolution and that the supports of the liaison organs on the organ of revolution each have a

  preferably in the form of an arc of a circle whose

  yon is greater than the radius of the body of revolution at the level

of the support zone.

  In the case of the achievement requiring the least

  possible components, it is appropriate for the

  tioning is carried out in one piece or that, in order to obtain an optimized construction from the point of view of wear, a body of revolution is forced into the actuating member In this case 1 the part of the actuating member in which the rotational member is forcibly inserted is optimized from the point of view of the friction and wear behavior

  compared to his partner in terms of friction

  bottier, and the organ of revolution is optimized from the point of view of its behavior

  wear and tear in relation to his partner in

  friction, which is the "connecting element".

  If from the point of view of the dimensions, the member of revolution inserted at foroe is fixed according to a positicn limit of tolerance, one can obtain a adjustment of the sudden engagement of

  in such a way that the extreme position of the organ of

  the force introduced into the actuating device is

  movable with a set screw in accordance with

  of its longitudinal axis and towards the system of

contact or contact bridge.

  It may be appropriate to move the point of

  abrupt snapping in both directions In this case,

  according to an alternative embodiment, it is proposed that the

  revolution can be mounted so that it can move

  freely in the operating organ longitudinally

  and adjustable with an adjusting screw on the inside

  against the force of a pressure spring taking support

  between the revolution member and the actuating member.

  In this case, it is appropriate that the force of

  pressure spring train has, over its entire adjustment range, a value greater than the force component acting in the direction of the pressure spring, but in the opposite direction of the latter, snap springs

  and / or elastic contact bridges.

  In addition, to obtain an additional advance stroke, the pressure spring must be dimensioned in such a way that after actuation of the snap switch via the actuating member and

  once the end position of the system is reached

  contact person and the organ of revolution, the organ of

  has an additional return stroke due to compression of the pressure spring

  up to the pressure at contiguous turns.

  If the contact safety of the contact areas with twin contacts and the free mobility, also increasing the reliability of the contact, the contact system supported punctually, are still not sufficient in the case of very low operating speeds, the

  pressure spring inserted: between the actuator

  ment and the organ of revolution can be dimensioned such

  way along the stroke of the actuating organ

  the spring exerts a force greater than the

  positing, acting against it, of the force exerted by

  snap springs or the elastic contact bridge

  that in the region of the snap-in point, while exercising, towards the position of

  end of the actuating member, an inferior force

  than this force component and has a flatter characteristic than the snap springs or

elastic contact bridges.

  Similarly in the case of this embodiment,

  the snap-in points can be set via

  the fact that the point d: 'balance between the spring of

  pressure and the force component, acting to its

  clicks and / or contact springs

  is adjustable using a set screw.

  In all the possibilities of realization, it

  It is sensible that a degree of freedom of movement

  the contact system or the contact bridge is

  -30 mity by beaks of the insulating member that enter eventuale

  in frictional contact with the housing parts.

  Other features and advantages of the pre-

  invention will emerge from the description given below.

  after and with reference to the accompanying drawings, in which:

  FIG. 1 represents, according to the invention, a

  snap-action interrupter comprising a cover and a contact system seen in section and a partial sectional view of the

  actuating member provided with the organ of revolution

  force, the left half of the figure representing the position of the contact system when the

  tioning is depressed, while the right half

  be the snap switch in the rest position.

  Figure 2 shows a view of the switch of Figure 1 taken to the right of the center line along the line I-I and left of the center line along the line II-II; Figure 3 shows a section of the switch of Figure 1 taken along the line III-III; FIG. 4 represents sections of the system of

  punctual support (organ of revolution and organ of

  sound) in two perpendicular planes;

  FIG. 5 shows a section of an action organ

  ment and, in principle, the representation of a system

  contact me having only a contact bridge; and

  FIG. 6 represents a section of an organ of ac-

  comprising a rotational member movable longitudinally.

  The snap switch shown in the figures

  1 to 3 comprises a housing 1 and a cover 2, which is held by means of clips 3 (FIG.

  holes 4 (figure 1) of the casing 1 An actuating organ

  5 is guided by the upper collar 10 (FIG. 1)

  of the housing 1 and via bars 7 (FIG.

  1 and 3) in grooves 8 (FIG. 3) of the casing 1.

  A cylindrical spring 9 (FIG. 1) repels the actuator member

  in its rest position, the stop 10 (fig.

  re (1) determines the rest position of the

5.

  The fixed contacts 11, 12 are associated with the

  working tact (closing contact), while fixed contacts 13, 14 are associated with the rest contact (opening contact) Between the fixed contacts 11, 12 and 13, 14 on the other hand, is located the contact

  freely mobile, which is made up of

  15,16 which are joined through the insulating bodies 17, 18 to form unit The two click springs 19, 20 are mounted between knife holders

  21, 22 of the insulating bodies 17, 18 and two

  23,24 in the organ of revolution 25.

  We will explain in detail the constitution

  contact bridge with reference to Figure 3 which shows a top view of the contact bridge 15: the paired contact pairs 26, 27 and 28, 29 associated

  contact platforms i 5 a and 15 b are electrically connected

  between them through the narrow barrett-

  Ai and A 2 and, in a position opposite, by the

  also narrow bars B1 and B2 through the medium of

  In the case of point supports 23, 24, the contact system can adapt to a large extent to the differences in position, if any, between the pairs of

  contact 26, 27 / 28,29 and the four points of support

  fixed points (the two points of contact of the fixed contact are designated in Figure 2 by lia and lib), and

  until three of the four contact zones

  As the punctual support zones relatively easily allow a flexion of the contact bridge constituted so as to be unstable in flexion as is known by means of the bars

  Ai, A 2 and Bi, B 2, the fourth zone of con-

  tact comes evenly in support during the snap-in, in the case of small differences in

  contact forces The free mobility of the system

  It is for this purpose that the spouts 17a, 17b are formed by molding on the insulating body 17 and on the insulators 17a and 17b.

  spouts 18a and 18b on the insulating body 18.

  The different possibilities of fixing a

  interrupter with the constitution represented are described

  in the German patent application filed under the provisional number P 31 39 720 8 or in the German utility model filed under the provisional number G 81 29

211 2.

  With the aid of FIG. 4, the point bearing zones 23, 24 between the connecting members, namely in the example shown, will be explained in detail.

  the snap springs 19 and 20 and the rotator

  The latter has a groove 30 running around its periphery in order to prevent the snap springs 19, 20 from

  escape in the direction of arrow C, that is,

  say, leave their intended position of symmetry, the

  snap spells have arcuate cut-outs 31, including spokes, to ensure punctual support areas in all possible positions

  the functioning of the organ of revolution 25 by

  port at the position of the connecting members 23,24, must be equal to or greater than the radius of a circle passing through the points 27, 32, 33 located on its periphery. The points 32, 33 are the points of intersection of the plane X 1-X 2 with the line Y 1 -Y 2 and on the other hand with the line Y 1 -Y 2 with the circumferential line Z.

  Referring to FIG. 5, the possibility is explained

  ability to adjust the spatial position of the organ of

  25, inserted rigidly by force into the

  The organ of revolution 25 is inserted to form

  during assembly until it comes into effect

  at the level of the surface 34 in a hole 5a of the actuator

  The tip 35, which protrudes into the hole

  5 a of the organ of revolution 25, has counter

  stripping 36 to obtain a perfect tight fit When applying the parts 5 and 25 on the surface 34, we obtain as advance stroke the distance

  D and as complementary race the distance E Theo-

  abrupt engagement occurs when the value

from the distance D has become zero.

  In the example of Figure 5, the system of con-

  tact consists of a single contact bridge 49 on the

* which snap springs 50, 51 are symmetrically shown

  bolique are hung through isolated organs

  52, 53 by means of knife support (21,22) The fixed contacts are designated 54 a, 54 b and

a, 55 b.

  With regard to the mounting, it is advantageous, during the adjustment indicated by way of example, to adjust the individual partial dimensions determining the advance stroke so that an adjustment can always be made.

  made from too much lead -

  In order to reduce the distance D, the screw 37 is adjusted,

  which is supported in 38 on the organ of revolution 25,

  that this organ of revolution 25 be pushed out

  5a and that the undercuts 35 are

  sink in the hole 5 a The advance race is then

  less the value of which the organ of revolution 25 is

  pushed out of the actuating member 5, while the

  complement the value of this value.

  round is obtained from the sum of the race E

  to be adjusted and to which is added the distance F of opening

  contacts Naturally it is possible to

  moment of securing in one piece the organ of revolu-

  25 and screw 37. This simply requires compliance with

  sea the organ of revolution in such a way that it is

  ble-longitudinally and that it is inserted in the actuating member 5 being provided with a locking system

against untimely rotation.

  In FIG. 6, the organ of revolution 39 is

  so as to be freely movable in accordance with

18797

  longitudinal direction G in the actuating member 40

  whose stroke is predetermined by stops 41 and 42.

  In this example, the return spring 43 is disposed on the lower end 44 of the body of revolution 39. The locking against any rotation is obtained using a

square piece 39 a.

  In the case of the sizing of the spring

  sion 45 so that its elastic force is, on all

  the adjustment range, greater than the component of the

  this elastic snap spring, which acts against

  the force of said pressure spring 45, conditions are obtained

  The difference with respect to the embodiment of FIG. 5 lies in the entirely decisive advantage according to FIG.

  which once reached the end position of the

  gane of revolution 39 which corresponds to the race D +

  E of FIG. 5, the actuating member 40 can be

  core depressed in supplement until he comes to take

  support 42 or that the pressure spring 45 is

  folded with contiguous turns Using the adjusting nut

  46, which is supported in 47 on a collar of the organ of ac-

  against which the pressure spring 45

  pushing said adjustment nut 46, it is possible to adjust

  the moment of sudden engagement in both directions.

  In the case of the sizing of the spring

  sion 45 so that it presents, throughout the race of

  the actuating element, a force greater than the component

  health, acting against that jurisdiction, of force

  by the snap springs and / or the bridge of

  elastic tact, in the region of the engagement point

  abrupt, said force being however lower, in di-

  of the end position of the actuator

  this component, and in such a way that

  pressure spring has a more

  such as snap springs or contact bridges

  ticks, we obtain what is called a latching function.

  sudden double, of the type described in the application for.

  German Patent Publication No. 29 13 913 The Difference

  that of the solution according to the invention in relation to the

  German Patent Publication No. 29 13 913 holds in the enormous advantage that no support to be inserted in the actuator is necessary and that the setting of the engagement time is necessary.

  from the outside is possible through the intermediary

  Adjustment nut 46 The value of the advance stroke

  it is equal, in this embodiment, to the distance

  this D shown in Figure 5, minus the stroke X (not shown), the pressure spring 45 can be compressed by the shoulder 48 The return point is also reduced by this value X, that is to say differential stroke, corresponding to normal, are (in the case of a pressure spring 45 which can not be

  awarded by the force component of the click spring) at the distance F between the contacts (Figure 5), is increased by the value 2 X, that is to say is equal to the value F + 2 X. The function of the forced opening device can be

  explained with reference to drawings 1 and 2 The S two le-

  forced opening 56, 57 are journalled in 56 a

  and in 57a in the box 1 and the lid 2.

  After depression of the actuating member 5 and once reached the switching point of the contact system, but said switching being prevented for

  for whatever reason, the organ of revolution comes into

  active contact, at 58 or 59, with the contact bridge, after the travel of an additional travel element which takes into account the wear occurring during operation at the contacts, and consequently triggers

  imposed an opening of the contact in the rest position (

opening tact).

Claims (9)

CLAIMS -   1 electric click switch consisting of at least one fixed pair of fixed contacts (11,12; 13,14-)   on the housing, a movable contact bridge (15, 16)   both of the contact platforms, molded on both ends, with at least one contact on each platform, and a pusher trigger acting as an actuating member (5, 25/39, 40), on both sides of which the fixed contacts are arranged, the actuator serving simultaneously as support   for the movable contact bridge with an engaging action   abruptly and making a double interruption, while on each side of the contact bridge is provided a snap spring (19,20 / 50, 51) of which one edge is worn,   in the manner of a knife support, on insulated organs   lants arranged on the contact bridge or between superimposed contact bridges, and the other edge, located vis-à-vis, is supported in a recess in   the actuating member, characterized in that   Twin tacts are provided side by side on each side of the contact bridge (15, 16) transversely to the longitudinal axis, that point contact zones of the snap springs (19, 20/50, 51). on opposite sides of the actuating member (5.25 / 39.40) are provided on the free end of the actuating member ( 5, 25 / 39,40), next to the   contact bridge (15, 16), there is provided a recess with   metry of revolution formed in said actuator   the contact bridge (15,16) is in itself xible.   2 electric snap switch according to the re-   claim 1, characterized in that the support zones   springs (19,20 / 50,51) on the actuator-   25,39) respectively have a cut-out (31) preferably in the shape of an arc of a circle, the radius of which is greater than the radius of the actuating member (25,39). at the level of the support zone.   3 Electric click switch according to one   any of claims 1 and 2, characterized in that   that the actuating member (5,40) is in two elements   and an organ of revolution (25,39) carrying the renfon-   cement is inserted into the actuating member (5, 40).   4 Electric snap switch according to the re-   claim 3, characterized in that the   of the organ of revolution (25), inserted in a link   frictionally in the actuating member (5), can be moved by means of an adjusting screw (37) in the direction of its longitudinal axis and spaced from the actuating member (5).   5 electric snap switch according to the claim   3, characterized in that the revolution member (39) is arranged to be able to move with a certain clearance in the actuating member (40) and can   be adjusted using a set screw (46) to   force of a pressure spring (45) taking   between the organ of revolution (39) and the organ of tion (40).   6 Electric snap switch according to the re-   5, characterized in that the reaction force of the spring   prestressed pressure (45) is greater, on the whole   of its adjustment range, to the force component of the snap springs (19,20 / 50,51), acting in the direction   pressure spring (45), but in the opposite direction of this   deny 7 Electric switch-clicks one   any of claims 5 and 6, characterized in that   that the reaction force of the pressure spring (45) is selected in such a way that after actuation of the trigger switch via the actuating member (39, 40) and once reached the end position of the 251,879;   contact system and the body of revolution (39), the actuating member (40) has an additional advance stroke capable of producing its block as a result of   setting contiguous turns of the compression spring (45). (45).   8 Electric click switch according to one   any of claims 5 to 7, characterized in that   that the pressure spring (45) is dimensioned such that   way along the running of the operating bodies   (39,40), it has a force greater than the   positing, acting against that jurisdiction, of the   this exerted by the springs to click (19,20 / 50,51) in   the region of the snap-in point, the said   however, it is lower in the direction of the end position of the actuating member (39, 40) at this point.   component and that said spring has a characteristic   than flatter than the springs   click (19,20 / 50,51) or elastic contact bridges.   9 Electric click switch according to one   any of claims 1 to 8, characterized in that   that the rotational movement of the contact system of the contact bridge (49) about the axis of the revolution member is limited by the beaks (17a, 17b / 18a, 18b) of the member   insulation (17,18), which are turned towards the walls very close to the boxer.   10 Electric click switch according to one   any of claims 1 to 9, characterized in that   that in the parts (1,2) of the housing are journalled   levers of forced opening (56,57), which, after   by means of the actuating member (5,25 / 39,40) and in the event of prevention of the abrupt switching of the contact system, establish a forced connection   between the organ of revolution (25,39) and the intermediate organ   insulation (17,18 / 52,53) or respectively the system of contact.