FR2676856A1 - ELECTRIC SWITCH WITH ACTION IN SHRINK AND SWITCHING ASSEMBLY FORMED OF SEVERAL COMPARTMENTS. - Google Patents

Abstract

It comprises a control button (3) actuating a plate (5) in three parts (8, 9, 10) including a door at least one movable contact, and it is characterized in that at least the part (8, 10 ) on which a finger (31) of an actuating lever (30 ') rests comprises means (19, 20) capable, in cooperation with said finger (31), of carrying out a movement in the same plane of said plate (5) before tilting. Application in particular to the control of electric circuits of motor cars.

Description

AT

  SWITCH 1 ELECTRIC JR WITH ACTION IN SHRINK AND ASSEMBLY

  SWITCHING OF MULTIPLE COMPARTMENTS

  The present invention relates to improvements

  made to the electrical switches

  abrupt type of known type comprising, on the one hand, a

  thin sheet of elastic metal divided, by two longitudinal slots, into three strips, one of which, at least,

  relies on and can switch on a support between two

  in at least one of which a movable contact carried by said plate is pressed against a fixed contact secured to the support and, secondly, a pivoting actuating lever which can also rock on said support and which carries at least one finger for actuating said plate by sliding support along one, at

  least, other strips of the wafer.

  A switch of this type has been described, for example,

  in the French Patent No. 2,221,801, in the name of the company DAV It has the advantage, thanks to the changeover

  abruptness of the mobile contact plate due to a

  fet of "exceeding the dead point", to allow the

  high intensity currents and currents

  (eg several amperes) despite a low

the device.

  Such switches are widely used in

  the automotive industry for the control of many

  For most applications, these switches have their two positions (work and rest) stable naturally, thanks to the effect of exceeding neutral which triggers the mobile contact plate -2- to one or the other. other of its positions and keeps it there. As a result, the control key, which is

  generally integral with the rocking action lever

  must be operated by the operator in one direction to establish the working position and, in the opposite direction,

  to return to the rest position.

  In recent years, there has been a

  proud of the operation of the electrical switches, with the so-called "push-push" switches in which the operator pushes the control key to establish the work position and pushes the same key again to return to

the rest position.

  These push-push switches are widely used

  TVs, radios, etc., but generally do not allow the breaking of high currents, because, most often, they do not work

not by sudden action.

  It is an object of the present invention to provide an improved breakaway switch with a short stroke.

  The subject of the invention is an electrical switch

  than a sudden action, of the type comprising a housing, a control key of at least one pivoting operating lever disposed in said housing, a thin wafer

  divided elastic metal by two longitudinal slots

  the, in three bands of which at least one rests and can rock on a support between two positions in one, at least, of which a movable contact carried by said plate is pressed against a fixed contact, said lever

  actuator having at least one finger for

  said platelet by sliding support along at least one of the strips of the wafer, and characterized in that at least the strip on which the finger is supported comprises suitable means, in cooperation with said -3- finger , to make a displacement in the same plane of

said wafer before tilting.

  An advantage of the present invention lies in the fact that a friction is achieved between the electrical contacts, before their separation, which allows to have clean contacts for a better conduction of electricity. According to another characteristic of the invention, the wafer is guided on a support so as to avoid any lateral displacement of said wafer and to always obtain a repetitive support between the electrical contacts.

  Other advantages and characteristics appear

  upon reading the description of the invention,

  as well as the accompanying drawings in which: FIG. 1 is a diagrammatic sectional view of the

  electrical switch according to the present invention.

  Figures 2a to 2c are perspective views

  of the thin wafer, according to several modes of

tion.

  FIG. 3 is a perspective view of the support

  of the thin wafer, according to a first embodiment of

  tion. FIG. 4 is a sectional view of the support

shown in Figure 3.

  FIG. 5 is a sectional view of the support

  according to another embodiment.

  The electric switch with sudden action

  takes a case 1 on which is articulated a touch of

  command 2 which, in FIG. 1, has a two-way

  The control switch pivots around a pivot axis 3. The electrical switch accordingly comprises two switching assemblies arranged on either side of a central fixed blade 4 which is in position.

  copper; the following description is made with reference to

-4-

one of the switching sets.

  The switching assembly comprises a thin plate of elastic metal 5, shown in perspective in FIGS. 2a to 2c, which is divided by two longitudinal slots 6, 7 into three strips 8, 9 and 10. The central strip 9s a support 11, shown in detail in FIGS. 3 and 4 in particular,

  said carrier being electrically conductive and

  a part 12 adapted to be plugged into a base 13 of the housing and constitute a power supply contact plug.

  The thin wafer 5 carries at one of its extremes

  two movable electrical contacts 14 may come into abutment on an upper fixed electrical contact 15 provided on a return 16 of the central plug 4; Or on

  a lower electrical fixed contact 17 carried by a

  The central strip 9 has two openings, one 29 for fixing on the support 11 and the other 36 for stopping a possible

  fat migration to the moving contacts 14.

  The opening 36 is semicircular in shape, the ridge

  36a right being located on the side of the movable contacts 14.

  The free ends 19 and 20 of the lateral strips

  8 and 10 are slightly bent (Figure 2a) and are first means for said plate 5 to move in the same plane before tilting, or before one of the contacts 14 bears against the upper contact 15 According to another embodiment (FIG. 2b), the side strips 8 and 10 comprise close to their ends 19 and at least one upward camber 35 and said camber 19a and 20a play the same role as the curvatures. According to another embodiment (FIG. 2c), the lateral strips 8 and 10 each comprise, close to the end 19, 20, at least one shallow groove 35 ', which allows also

  a translation of the wafer 5 before tilting.

  The support 11 comprises a first portion 12 forming a contact plug or connecting tab, a second inclined portion 21 and a third portion 22 which can be inclined or horizontal and parallel to the portion 12, as shown in FIG. near the junction of parts 12 and 21, a

  opening 23 is provided in part 12 and the languet-

  The metal tongue 24 thus produced is folded in one direction or the other The tongue 24 constitutes a stop that bears against a bottom 25 of a passage 26 for the portion 12 in the base 13, beyond the tongue 24, the support 11 can not be removed The insertion is authorized thanks to the elasticity of the tongue 24 which is housed in the orifice 23 the time required for the

crossing the base 13.

  The part or leg 22 is between two

  support zones 27 provided for in Part 21, and

  carries a notch 28 Part 22 passes through a

  opening 29 in the central band 9 of the

  thin strip 5 The central strip 9 rests on the bearing areas 27 which constitute, with the opening 29, support and guide means for the thin wafer 5. The notch 28 has a dual function The first

  is to correctly position the support there in the so-

  13 of the housing, by means of a suitable tool which is engaged in said notch The second is to provide two wings 28a which, after folding in any direction,

  prevent the thin wafer 5 from escaping out of

  port when reversing the switch This way,

  very small tolerances are

  mounts the opening 29 of the wafer, which can be

  oversized compared to part 22.

  Thus, the part 22 constitutes both a guiding and retaining means for the band 9 of the wafer 5.

  According to another embodiment

  In FIG. 5, the support has a second portion 21 'which is substantially perpendicular to the two

parallel parts 12 and 22.

  The switch shown in FIG.

  takes an inverted U-shaped piece 30 which is solidly

  re of the control key 2 and which, during pivoting pushes a lever 30 'comprising two fingers 31 whose lower ends 32 are in sliding contact on the side strips 8 and 10 of the plate 5 The fingers 31 are biased towards the position stable thanks to a spring 33, in the form of a hairpin, mounted between

  said fingers and the body of the casing 1 At the flip-flop

  the control key 2 around the axis 3, the

  ends 32 of the fingers 31 slide on the lateral strips

  8 and 10 until they meet the raised parts 19 and 20 At this time, and before they have passed the "dead point" or rather the tilting of the plate 5, the latter is moved laterally

  thanks to the action of the ends 32 on the parts

  19 and 20 The lower contact 14 is thus moved on the lower contact 17, thus causing friction between the contacts 14 and 17 and consequently a cleaning of said contacts, which ensures a better conduction of the electricity flowing in the plugs 12

and 18.

  In a preferred embodiment of the invention,

  The mobile and fixed contacts 14, 15 and 17 are made of an alloy of silver and cadmium oxide.

  and the central fixed blade 4 is made of copper.

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Claims (11)

  1 sudden-action electric switch of the type comprising a housing (1), a control button (2)   at least one pivoting operating lever (30 ')   in said housing, a thin plate (5) of elastic metal divided by two longitudinal slots (6, 7) in three strips (8, 9, 10) of which at least one (9) is supported and can switch on a support (11) between two positions in at least one of which a movable contact (14) carried by said plate (5) is pressed against a fixed contact (15, 17), said actuating lever (30 ' ) comprising at least one finger (31) for actuating said plate by slidingly pressing along at least one (8, 10) of the strips of the wafer, characterized in that at least the strip (8, 10) on which the finger (31) is supported comprises suitable means (19, 20), in cooperation with said finger, to make a displacement in the same   plane of said plate before tilting.   Switch according to claim 1, characterized   in that the displacement means (19, 20, 35, 35 ') of the wafer are provided on each side band   (8, 10) extreme of said wafer.   Switch according to one of claims 1 or   2, characterized in that the displacement means are constituted by a camber of the free end of the support band.   4 switch according to one of claims 1 or   2, characterized in that the displacement means consist of a boss or rib (35, 35 ') arranged near the free end (19, 20) of the strip bearing (8, 10).   Switch according to claim 1, wherein the support (11) is constituted by a contact card   (12) for supplying current, characterized in that the   port consists of two substantially parallel parts   (12, 22) which are joined by an intermediate party inclined (21).   6 switch according to claim 5, characterized in that the two substantially parallel portions (12, 22) of the support are joined by an intermediate portion (21 ') which is substantially perpendicular to the parallel portions.   Switch according to one of claims 5 or   6, characterized in that the support (11) has two support zones (27) for the strip (9) of the wafer, said zones being situated on either side of a   guide and retainer tab (22) for said band.   8 switch according to claim 7, characterized in that the guide lug (22) has a notch (28) formed between two wings (28 a) may be folded in one direction and constitute retaining means for the thin wafer (5).   Switch according to one of Claims 1 to 7,   characterized in that the portion (12) of the support, adjacent   te to that (21) bearing the bearing zones, is cut out   in order to make a tongue (24) which is lightly   folded relative to the plane of said portion (12).   Switch according to Claim 1, characterized in that the actuating lever (30 ') is recalled in   the stable position by a return spring (33).   Switch according to claim 1, characterized in that the contacts (14, 15, 17) are made in a   silver alloy and cadmium oxide.   Switch according to Claim 1, characterized in that at least one of the contact plugs (4) carrying   a fixed contact (15) is made of copper.   13 Switch according to claim 1, characterized in that the strip (9) carrying the contacts further comprises a hole (36) of fat stop likely to   migrate to said mobile contacts.   Switch according to claim 13, characterized   in that the orifice (36) is semicircular in shape with a straight edge (36 a) on the contact side mobiles (14).