FR2496331A1 - ELECTRIC SWITCH - Google Patents

Abstract

THIS IS AN ELECTRIC SWITCH WITH SWIVELING FINGER11 AND CONDUCTIVE BRUSH12, A POSITIONING TAB26 ENSURING, IN COOPERATION WITH A POSITIONING SCREW25, A POSITION CONTROL OF THE OPERATING FINGER11. FOLLOWING THE INVENTION, THE POSITIONING TAB26, WHILE BEING ABLE TO BE PART OF THE CONDUCTIVE BRUSH12, IS DISSOCIATED FROM THE CONTACT SLABS 20, 20 WHICH IT MAKES, AND IS THUS SUITABLE TO PLAY ELASTICALLY INDEPENDENT OF THESE CONTACT SLABS 20 20. APPLICATION TO ELECTRICAL SWITCHES.

Description

The present invention relates generally to switches

  electric generators of the kind comprising a body, an operating finger pivotally mounted on said body between two extreme positions, at least two contact pads disposed in said body, a conductive broom carried by the actuating finger and having at least one clean contact strip to cooperate with one of the contact pads, and means of

  position control which, acting between the

  said contact pads and the conductive brush comprise a positioning screed and a positioning tab

able to cooperate with it.

  Such an electrical switch is particularly described

  in French Patent No. 1,219,900.

  It has the advantage of satisfying a great deal

  building construction, the driver's broom which he

  constituting by itself the positioning tab of the position control means, so that one and the same piece,

  know this conductive broom, properly cut and conform

  it assumes a multiplicity of functions, and especially those of current flow, of contact pressure on the pads of

  contact, and position control of the operating finger.

  But, in practice, in the embodiment described in French Patent No. 1,219,900 mentioned above, the conductive brush is reduced to a metal strip which, by its central zone, shaped for this purpose in V or U open, constitutes the positioning tab intended to cooperate

  with a fixed positioning screed, and by its lateral wings

  are contact lamellae in continuity with its central zone, and which, at its ends, is engaged in recesses of the operating finger in which it is

  thus found abutment, and thus restrained.

  This clamping of the conductive broom, conjugated with a cylindrical shape of the positioning screed with which it cooperates, does not allow, in practice, a str functioning of

  overall, because it can lead to unwanted twists and turns

  of the conductive broom on its contact pads, and therefore to

  the production of arcs prejudicial to the longevity of the whole

corn.

  It does not guarantee a good pressure of con-

  tact on the contact pads, which excludes the possibility of

  relatively high intensity of service,

dre of ten amps for example.

  It finally leads to a limited stroke for the finger of operation and a noisy operation of it. This is because, due to the clamping of the conductive broom at its ends, any elastic play of the contact lamellae reacts on the formed positioning tab.

  between them, and vice versa.

  The present invention generally has a provision for avoiding these disadvantages, while allowing, if desired, to retain the advantages of

  a unique embodiment of the conductor broom and any one

  that positioning devices, tab or screed, associated

to the maneuvering finger.

  More specifically, the subject of the present invention is an electrical switch of the kind comprising a body, a control finger pivotally mounted on said body between

  two extreme positions, at least two contacts contact

  placed in said body, a conductive broom carried by the finger

  maneuvering device and comprising at least one contact strip

  pre to cooperate with one of the contact pads, and conductive position control means which, intervening between 1 '

  other of said contact pads and the conductive broom, comprising

  a positioning screed and a positional tab

  able to cooperate with the latter, this ejector switch

  characterized in that the positioning tab is dissociated from the contact strip and is thus suitable for

  play elastically regardless of it.

  This dissociation of the positioning tab

  vis-à-vis the contact strip does not necessarily

  that these are two completely separate parts, that is,

  that is to say two rooms having no common point between them.

  On the contrary, and although, alternatively, the tongue of

  positioning can form a separate part of the broom

  duct and carried by a contact pad for cooperation with a yoke carried by the mop conductor or constituted by a suitably shaped portion thereof, according to a preferred embodiment this positioning tab is integral with the conductive mop, all constituting a

  only piece properly cut, folded and arched.

  In such a case, the positioning tab is not shifted transversely with respect to the contact strip. In a variant, arranged in the axis of this lamella

  contact, it is formed by means of a broom burst con-

  ducer. In both cases, although belonging to the same piece, the positioning tab and the lamella

  who assume different functions, may

  to play elastically independently of one of the

  that is, without inter-reaction between them.

  It is all the more so that, according to the invention,

  on the one hand the positioning tab extends door-to-door

  false from an area of rooting, so that its ex-

  free end, which is the active part, can play

  elastically freely, and that, on the other hand, the

  at least one of the contact strip extends to the right of a recess of the operating finger, so that it too can

play elastically freely.

  Thus, the physical dissociation made according to the invention

  between the positioning tab and the blade of con-

  tact advantageously translates into a dissociation between

  functions ensured by these two parts, which guarantees the in-

  execution dependency between these two functions.

  In addition it is accompanied by the presence of elastic parts between the functional parts, which ensures a

free play to these.

  This results in a safe operation for all, and in particular a good contact pressure on the pads of

  contact, and good position control for the finger of

noeuvre.

  The features and advantages of the invention

  will come out from the following description, as a

  for example, with reference to the accompanying schematic drawings in which: Figure 1 is a view, part in elevation, and part in section, along line II of Figure 2, the main components of an electrical switch according to the invention ; FIG. 2 is a plan view along the line II-II

  of FIG. 1, the conductive brush implemented in this

  electric mutator, shown separately; Figure 3 is a larger scale, a sectional view of the conductive broom, along the line IIIIII of Figure 2; FIGS. 4A, 4B, 4C are views partly showing that of FIG. 1 and illustrating the operation of the electrical switch according to the invention; Figure 5 is a view similar to that of Figure 1, for an alternative embodiment; Figure 6 is another view similar to that of Figure 1, for another embodiment; Figure 7 is an elevational view of an alternative embodiment of one of the components of the electrical switch according to the invention, shown in isolation; FIGS. 8 and 9 are views similar to that of FIG. 3 and relate respectively to a shape of

  realization of the conductor brush implemented in such a com-

  electrical mutator; Figure 10 is a view similar to that of Figure 1, and relates to another embodiment; Figure 11 is a view similar to that of Figure 2, for the conductive brush implemented in this embodiment; FIG. 12 is a view similar to that of FIG.

  2, for another variant embodiment of this conductive brush

  tor; Figure 13 is a longitudinal sectional view of this embodiment variant along the line XIII-XIII of Figure 12;

  FIG. 14 is a cross-sectional view thereof,

  line XIV-XIV of Figure 13; Figures 15 and 16 are views similar to that

  of Figure 1 and relate respectively to a different

the realization.

  In general terms and as illustrated by these

  the electric switch according to the invention comprises

  a body 10, which is not part of the present invention.

  tion, was only schematized by its outline, in

  broken, in Figure 1, a maneuvering finger 11, which is

  pivoting on the body 10 between two extreme positions, and a conductive broom 12, which is carried by the operating finger

11.

  The body 10 and the operating finger 11 are made of insulating material. For its pivoting mounting, the actuating finger 11, which is generally parallelepipedal, carries transversely

an axis 13.

  It may be a separate piece, but it may also be two trunnions present laterally in

  protruding on the longitudinal sides of the operating finger 11.

  In the body 10 are arranged at least two contact pads. In the exemplary embodiments shown, these contact pads are three in number: there is a central block

  14, and two lateral pads 15, 15 '.

  In the exemplary embodiment represented on the

  1 to 4, the lateral contact pads 15, 15 'are

  each respectively on either side of the central stud 14, in alignment with each other, but for reasons which will appear hereinafter, the central contact pad 14 is offset transversely with respect to the alignment that form

  the lateral contact pads 15, 15 '(not visible on the

  figures). Moreover, in the embodiment shown in FIGS. 1 to 4, the contact pads 14 and 15, 15 'all by themselves form connection terminals, and these are hole connection terminals 17, for engagement of a conductor, and screw 18, for tightening thereof, but it is not

necessarily so.

  On the contrary, the contact pads may constitute separate parts of the connection terminals to which they are associated, being properly electrically connected thereto, and / or these connection terminals may be of a different type of loops described above. , and for example being tab-type connection terminals, or other, allowing

2496-331

  a direct commitment of the drivers concerned or a connection

fast of these.

  The conductive broom 12, which is shown in isolation

  in Figure 2, is a single piece from a sheet of paper.

  metallic bacon, suitably cut and shaped

  It comprises at least one contact strip.

  In the exemplary embodiment shown, two lateral contact pads 15, 15 'being prevuse the conductive broom

  12 comprises two strips of contaci 20, 20 'each

  adapted to cooperate with the lateral contact pad

, 15 'corresponding.

  In the exemplary embodiments shown, the contact strips 20, 20 'bear, at their end, for cooperation

  with the lateral contact pads 15, 15, grains of

  tact 21, 21 ', silver, for example, or silver metal, in a manner known per se; but it is not necessarily so. For cooperation with these contact grains 21, 21 ', the contact pads 15, 15' have, in the example of

  embodiment shown in FIGS. 1 to 4, a raised boss

  round 22, 22 ', which can also be a reported boss, in

  silver or silver metal, if desired.

  The free end at least, and in practice all, of each contact strip 20, 20 'of the conductive broom 12 extends to the right of a recess 24, 24' of the operating finger

  11, so that it can play elastically freely with

  contact contact pad 15, 15 ', by deforming elastically. The control finger 11 is associated with position control means, and these are conductive position control means which, acting between the central contact pad 14 and the conductive brush 12, comprise on the one hand a clevis of positioning 25, and on the other hand a tab

  of positioning 26 adapted to cooperate with the clevis of position-

25.

  According to the invention, the positioning tab 26

  is dissociated from the contact strips 20, 20 'of the conductor blade.

  12 and is thus able to play elastically independently

of these.

  However, in the embodiment illustrated in FIGS. 1 to 4, this positioning tab 26 is

  body with the conductive broom 12, extending door-to-door

  false from an area of rooting 27 belonging to that

this.

  It is shifted transversely to the

  contact areas 20, 20 ', its rooting zone 27 being disposed at the end of a portion 28 of the conductive broom 12 which,

  elongated in a strip parallel to the positioning tab

  26, is intermediate between the latter and the contact strips 20, 20 ', by connecting in continuity this tab of

  positioning 26, At these contact strips 20, 20 '.

  In the exemplary embodiments shown in FIGS. 1 to 4, the positioning tongue 26 is separated from the strip 28 by a disjointed lip slot 29, and likewise this strip 28 is separated from the contact strips 20,

  by similar slots 30, 30 '.

  But that is not necessarily so, the separatists

  on the contrary can be achieved by joined lip slots resulting from a simple shear

and not a cut.

  The essential thing is that the contact strips 20, 20 'of

  one hand, and the positioning tab 26 on the other hand ,.

  can play elastically freely independently

others.

  At one of its ends, the strip 28 of the conductor blade

  12, which forms a median part, forms, by an

  the area of rooting 27 of the tongue of

  sitioning 26; at its other end, it presents, in the exemplary embodiment illustrated in FIGS. 1 to 4, a

  other unfolding 27 'similar.

  These expansions 27, 27 ', which are coplanar and

  corresponding to the initial plan of the strip in which

  cut the conductive broom 12, are used for fixing

  of the latter to the maneuvering finger 11 ..

  In the exemplary embodiment illustrated in FIGS. 1 to 4, this fixing is done by crimping:

  crimping 32, 32 'from pillars 33, 33' from the hand of

  11 cross passages 34, 34 'provided for this purpose

  in the expansions 27, 27 'of the conductive broom 12.

  Likewise, a crimping pin 35 coming from a metal pillar

  dian 36 of the maneuvering finger 11 passes through a passage 31 of the base

  lai driver 12 provided for this purpose at the root of the contact strips 20, 20 'thereof, in the intermediate position. In the embodiment shown, the passages

34, 34 'and 31 are circular.

  From its rooting zone 27, the tongue of

  positioning 26 extends obliquely.

  In the embodiment shown in FIGS.

  1 to 4, its free end, or nose 37, forms a V-shaped dihedron. As shown in this embodiment,

  for the rest configuration of the positioning tab

  26, the bisecting plane of the dihedral formed by its free end 37 coincides with the plane containing the edge 48 of this

  dihedron 37 and the axis of rotation 13 of the operating finger 11.

  Together, in this embodiment, the screed

  25 which cooperates with the tongue of

  sitionnement 26 is carried by the central contact pad 14 and has a convex profile, said here, for convenience, profile convex dihedron. Preferably, and as represented, the summit zone

  this screed is softened by a round.

  In such a case, the relevant electrical switch

is a back and forth.

  Indeed, the two extreme positions of his finger

maneuver 11 are then stable.

  For example, when the positioning tab 26

  is supported on the flank of the positioning yoke 25 oppo-

  side contact pad 15, Figure 1, it results from this support the application to the operating finger 11 of a tilting torque which, according to the arrow F of Figure 1, maintains the contact strip 20 of the conductive broom 12 in touch with

this lateral contact pad 15.

  As a result, electrical continuity is established between, on the one hand, the central contact pad 14, which constitutes an arrival terminal, and, on the other hand, the lateral contact pad

  , which constitutes an output terminal.

  The corresponding contact pressures are ensured by the fact that both the positioning tongue 22 and the

  contact strip 24 are elastically deformed, independently

from each other.

  In FIGS. 1 and 4A, the elastic deformation of the

  contact strip 20, made possible by the recess 24 cor-

  respondant maneuvering finger 11, is illustrated by the fact that this contact strip 20 deviates from the plane of the strip in which is cut the conductive broom 12, materialized by the rooting zone 27 of the positioning tab 26. In acting on the actuating finger 11 in the opposite direction to that of the arrow F of FIG.

  corresponding tilting of this operating finger 11, which

  on the one hand, the contact strip 20 to lose contact

  with the lateral contact pad 15, and on the other hand, the

  positioning watch 26 to be crossed, by elastic deformation

  tick, the positioning screed 25, FIG. 4B.

  Beyond this neutral position corresponding to the crossing of the positioning screed 25, the operating finger 11 continues to tilt itself, until the contact strip 20 'bears against the stud lateral contact 15 'corresponding, according to

  similar to those described above, the posi-

  tioning 26 then bearing on the side of the positioning screed 25 opposite this lateral contact pad 15 ',

Figure 4C.

  The central contact pad 14 is then, so

  stable, in electrical continuity with the lateral contact pad

ral 15 '.

  In the variant embodiment illustrated in the figure, the positioning screed 25 has a concave dihedral profile. The electrical switch concerned then constitutes a momentary momentary inverter with its operating finger 11 being permanently elastically biased in the median position for which, as shown, the lamellae

  contact 20, 20 'of the conductive broom 12 are one and the

  away from, lateral contact pads 15, 15 '.

  In such a case, in fact, the extreme positions of the

  maneuvering finger 11 are unstable, and electrical continuity

  between the central contact pad 14 and the grounding pad

  lateral tact 15, 15 'corresponding is maintained only as far as a corresponding action is exerted on the operating finger 11. In the embodiment shown in Figure 6, which combines the two previous, the chaps positioning has a concave dihedral profile but it also includes

  two oblique sides 38, 3'81 on either side of the dihedron

  cellar that it forms, in the opposite direction to that of the flanks of this

  dihedron, and thus presents two edges 398 39 '.

  In this case, the electrical switch concerned is

  a center point inverter with continuous continuity.

  Indeed, its operating finger can occupy one or the other of three stable positions, i.e. two positions

  extremes for which the central contact pad is in

  electrical continuity with the lateral contact pad 15, 15 'cor-

  respondent, and a median position for which this

Electric night is interrupted.

  In the above, the positioning screed 25 has

overall a symmetrical profile.

  It is not necessarily so.

  On the contrary, in the diagrammatic embodiment

  illustrated in Figure 7, it may include a profile

  asymmetrical, forming in continuity first a dihedral

vexed then a concave dihedron.

  The electrical switch concerned then constitutes a center-point inverter with maintained continuity for one

  extreme positions of his maneuvering finger, which is

  ble, and at momentary continuity for the other positions

  extremes of it, which is unstable.

  In the embodiment illustrated in FIG. 8,

  the free end, or nose 37, of the positioning tongue

  26, forms a gutter with a semicircular profile.

  In the embodiment shown in FIG. 9, it forms a V-shaped dihedral, as previously, but, for the rest configuration, the bisecting plane of this dihedron

  is oblique vis-à-vis the plane containing the ridge 48 of this-

  ci and the axis of rotation 13 of the actuating finger 11.

  This provision is likely to facilitate the

  positioning tab 26 on the clevis of po-

  sitioning, at least for one of its flanks. In the embodiment illustrated by the figures

  , 11, the free end, or nose 37, of the position tab

  26 is subject to a spring 40 intended to come into

  force the contact pressure of this position-

26 on the positioning screed 25 with which it cooperates, in the case o, for at least some applications, the position control of the operating finger 11 must be

particularly firm.

  To maintain this additional spring 40, which is supported at the bottom of a well 41 formed for this purpose in the finger

  11, the free end 37 of the tongue of

  sitioning 26 has a projection, in the form of

  shown, a spoiler 42 on which said additional spring

  40 is engaged; alternatively, the V throat that forms

  this free end 37 serves as a support housing and app-

  for the additional spring 40 (not shown).

  In addition, in the embodiment shown

  positioning tab 26 is separated from the metal strip

  diane 28 of the conductive broom 12 only by a lip slot

  attached, and this band 28 runs only on one half of the

  lai driver 12, between the positioning tab 26 and

the contact strip 20.

  Finally, in this embodiment, the passages 34 and 31 provided in the conductive broom 12 for crimping pins adapted to fix it to the operating finger 11

  form buttonholes elongated oval.

  In the embodiment illustrated in FIGS. 12 to 14, the positioning tab 26 extends in the axis of the contact strips 20, 20 ', and is formed in favor of

  a flat 43 of the conductive broom 12.

  In addition, the contact strips 20, 20 'are offset

  compared to the plane of the frame 44 surrounding the flat 43, this

  44 extending in a bowl with respect to these lamellae

tact 20, 20 '.

  Finally, in this variant embodiment, solidari-

  12 of the conductive broom 12 has a snap fit, the frame 44 of the conductive broom 12 having laterally projecting tabs 45 through

  which it is engaged in grooves 46 formed of

  complementary element in the actuating finger 11, the corresponding engagement being effected by elastic deformation of this

operating finger 11.

  In the embodiment diagrammatically illustrated in FIG. 15, the lateral contact pad 15 'is disposed opposite to the lateral contact pad 15, and only one contact strip 20 is provided on the conductive brush 12 for cooperation with either the contact pad 15 or with this contact pad 15 ', this contact strip 20 carrying for this purpose, on its opposite faces, two contact grains 21, 21'. In addition, in this variant embodiment, the lateral contact pad 15 'does not in itself form a connection terminal, but merely a properly connected tab

at such a connection terminal.

  In the variant embodiment illustrated in FIG. 16, the positioning tab 26 is carried by the stud

  contact center 14, for example by being reported by

  weaving on it, while the positioning screed

  with which it cooperates is carried by the conductor broom.

  12, being for example formed by a suitable part-

consistent form of it.

  In the foregoing, it has been admitted that the flanks of the dihedral of the positioning screed implemented were

globally plans.

  This is preferably so except for the positioning yoke shown in FIGS. 1 to 4,

  for which, in order to avoid an angular positioning pre-

  cis of this positioning screed, and therefore of the stud of

  central tact 14 which carries it, a conical shape is preferably

  given to this positioning screed.

  The qualifier of dihedron given here-to this screed must be understood in a broad way, to designate the corresponding profile, without necessarily resulting in the presence

of an edge.

  The present invention is not limited to the embodiments described and shown, but encompasses

  any variant of execution and / or combination of their di-

to elements.

  In particular, only two contact pads can be provided, a central contact pad and a lateral contact pad. In any case, and as will be understood, it

  advantageously, thanks to the international dissociation

  according to the invention between the positioning tab

  the contact blade (s) of the conductor broom,

  confer on this positioning tab, and on these

  contact, the elasticity required, irrespective of the

  each other, by cutting to an appropriate width of the

  corresponding parts of the initial strip.

e

Claims (13)

REVENDICA'IIONS   1) Electrical switch of the kind comprising a body, an actuating finger pivotally mounted on said body between   two extreme positions, at least two contact points   embedded in said body, a conductive broom carried by the actuating finger and having at least one contact strip adapted to cooperate with one of the contact pads, and conductive position control means which, intervening between 1 '   other of said contact pads and the conductive broom, comprising   a positioning screed and a position pin   It is adapted to cooperate with the latter, characterized in that the positioning tab is dissociated from the contact patch and is thus able to play elastically independently. of it.   2) electric switch according to claim 1, characterized in that the positioning tab extends   cantilevered from a rooting zone.   3) Electrical switch according to claim 2,   characterized in that the free end of the tongue of   sitionnement forms a dihedral-V-shaped profile. 4) Electrical switch according to claim 3, characterized in that, for the rest configuration of the positioning tongue, the bisecting plane of the dihedral formed by its free end coincides with the plane containing   the edge of this dihedral and the axis of rotation of the operating finger.   Electrical switch according to Claim 3, characterized in that, for the rest configuration of the positioning tongue, the bisecting plane of the dihedral which   form its free end is oblique vis-à-vis the plan contain-   the edge of this dihedral and the axis of rotation of the   noeuvre. 6) Electrical switch according to claim 3,   characterized in that the free end of the tongue of   sitionnement forms a gutter with a semicircular profile.   7) Electrical switch according to any one of   Claims 2 to 6, characterized in that the free end   the positioning tab is subjected to a spring.   8) Electrical switch according to Claim 7,   characterized in that the free end of the tongue of   sitioning has a protruding spoiler for jurisdiction to which it is subject.   9) Electrical switch according to claim 7, characterized in that the free end of the positioning tab forms a groove serving as a holding housing   and support for the spring to which it is subjected.   ) Electrical switch according to any one of   Claims 2 to 9, characterized in that the tongue   positioning is shifted transversely to the contact blade.   11) Electrical switch according to claim 10, and wherein the positioning tab is integral with   the conductive broom, characterized in that the root zone   of the locating tab is disposed at the end of a portion of said conductive mop which   parallel to said positioning tab, is   intermediate between the latter and the contact strip, by connecting in continuity said positioning tab and said contact blade.   12) Electrical switch according to claim 11,   characterized in that at its end opposite the zone of en-   rooting of the positioning tab, the strip connecting the latter to the contact strip itself comprises a zone   rooting by which it is linked to the finger of work.   13) Electrical switch according to any one of   Claims 2 to 9, and wherein the positional tab   It is integrally formed with the conductive broom, in the axis of the contact strip, characterized in that said tongue of   positioning is formed by a broom ducer.   14) Electrical switch according to any one of   Claims 1 to 10, characterized in that the tongue   of positioning is carried by the contact stud concerned, while the cope with which it cooperates is carried by driver broom.   ) Electrical switch according to any one of   Claims 1 to 14, characterized in that the   has a convex profile, for example a dia- convex.   16) Electrical switch according to any one   Claims 1 to 14, characterized in that the clevis   positioning has a concave dihedral profile.   17) Electrical switch according to claim 16, characterized in that the positioning screed comprises two oblique flanks respectively arranged on each side and   on the other hand, the concave dihedron which it forms, in the opposite direction to   he flanks this dihedron, and thus has two ridges. 18) Electrical switch according to any one of   Claims 1 to 14, characterized in that the   has an asymmetric profile with concave and dihedral dihedral convex.   19) Electrical switch according to any one of   Claims 1 to 18, characterized in that the free end   at least of the contact strip extends to the right of a recess   maneuvering finger so that it can play elastically freely.