CS216831B2 - Elctric switching device - Google Patents

Description

216831

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical switching device comprising a rigid insulating carrier for guiding a sliding rigid insulating support provided with conductive connecting tracks, the carrier carrying, on the one hand, flexible contacts which are firmly fixed in one end and flexibly contacting the active region of the conductive coupling means. washers inserted into the carrier and, on the other hand, the operating mechanism actuated by the operator and acting on the flexible contacts in the sense of switching and switching off. In particular, the invention relates to a switching device for connecting connecting conductor tracks on printed circuit boards.

In a switching device of this type, it is essential that the spring contacts be slightly lifted during insertion and extension of the printed circuit board in order to overcome their resistance and to prevent frictional joints on the board. As the plate is retracted, the flexible contacts must be firmly pressed on the plate to provide a reliable electrical connection.

A switching device of this kind is described by the American journal "IBM Technical Disclosure Bulletin", Vol. 10, No. 11, April 1968, p. 1656, and U.S. Pat. No. 3 744 005. The resilient contacts are clamped in a sliding slider of actuating mechanism that moves perpendicular to the plane of the plate. As a result, the elasticity of the elastic contact is pressed against the freeway perpendicular to the plane of the plate and does not engage in contact, so that it cannot remove the insulating layer of dust by friction, which usually forms on the conductive tracks and the elastic contacts and can to prevent the flow of weak electric current. Thus, the known switching devices do not ensure the self-cleaning of the contact surfaces and the conductive tracks. Due to the contact clearances in the slide, malfunctions can occur if the switching device causes oscillations that engage the flexible contacts and can lift off the conductive tracks on the board. In U.S. Pat. No. 3,329,926 discloses a switching device for printed circuit boards wherein each resilient contact is slightly deflected between a fold forming a solid support and a free end controlled by the movement of the slider. The movement of the slider in one direction reduces the radius of the curved active part of the contact, the top of which contacts the conductor track. Due to the slight initial deflection of the elastic contact, it is only difficult to control its exact deformation, and because only its elasticity is used to delay contact from the conductive path, the contact deformation size is greatly limited. and the self-cleaning effect. The purpose of the invention is to eliminate these shortcomings of known switching devices.

The essence of the invention is that the control mechanism comprises at least one movable slide on which a second movable end of the elastic contact is fixed and each resilient contact has an intermediate portion forming a hinge and a movable end anchored in the slide by two substantially straight branches. which are inclined relative to one another and to the surface of the slider movement and whose joint forms an active part of the flexible contact. Preferably, the movable end of the elastic contact is inserted in the slider opening and loaded with the resilient bias of the hinge portion, which may consist of a thread or arcs of opposite curvature. To firmly press the resilient contact wire through the conductive path, the slide can be coated with an additional piece, for example a rib, for engagement with a portion of the resilient contact during the switching movement. In this case, the advantage of both inclined branches of the elastic contact is the thread which forms its active part and at the same time the bearing surface of the groove of the slide. In this case, the rib is substantially perpendicular to the bottom of the groove in which the flexible contact is freely disposed.

Alternatively, the resilient contact may be provided with a resilient bend consisting of two consecutive arches of opposite curvature between its hinged fixed end and the hinge portion, and a section clamped in the auxiliary insulating mat which is displaceable parallel to the slider path and fits your motion paths to the solid-state.

The device according to the invention provides a reliable electrical connection of each elastic contact with the respective freeway in the clutch position and the separation of the contacts from the board during its insertion and withdrawal, while allowing the conductive tracks of the contacts to be cleaned by friction during the end of the insertion movement of the plate.

The device according to the invention can be used not only for printed circuit boards, but also for rectangular or cylindrical plug-in connectors.

The invention will be explained with reference to the accompanying drawings, in which: FIG. 1 is a plan view of an electrical switching device with a printed circuit board; FIG. 2 is a sectional view taken along line II-II of FIG. axonometric view of the switchgear, indicated in FIG. Fig. 4 is a cross-sectional view of the cut-out of the switching device of Fig. 3, with the upper half of Fig. 5 showing a closed and lower half open flexible contact; FIGS. 6a, 6b are cross-sectional views of the switching device in two extreme positions, FIGS. 7, 8, 9 in an axonometric view, and partially in cross-section of three modified embodiments of a switching device, FIG. Fig. 7a shows a deformation of its resilient contact, Fig. 11a, 11b, a cross-section through another embodiment of the switching device in two operating positions, Fig. 216831 12, a, 12b, 12c in cross-section of three operating positions of the switching device; 13a, 1, 3b show a cross-section through another embodiment of a switching device in two-operating positions.

The switching device according to the invention, shown in plan view in FIG. 1 and in section in FIG. 2, comprises a rectangular frame 21 from which it is shown in FIG. 1, only the upper side facing the inlet side of the insulating substrate with conductive connection paths is drawn, for example for the printed circuit board 2. The blending and ejecting mixture of plates 2 is shown in FIG. In addition to the inlet side, the frame 1 has three sides, of which at least one is provided with at least one coupling mechanism with flexible contacts 3 (FIGS. 3 and 5) perpendicular to the respective side of the frame 1. In the embodiment of FIG. 1, two coupling mechanisms 6, 7 and 8, 9 are disposed on each longitudinal side of the frame 1 and hence the plate 2. When the plate 2 is in the retracted working position of FIG. those 3 with their active parts 4 of conductive tracks 5 on its edge (Fig. 5 above).

Each coupling mechanism 6 to 9 comprises two movable sliders 10, 11 made of insulating material arranged symmetrically along the sides of the symmetry plane P-P (FIGS. 1 and 5) of frame 1 and plate 2. Each slider 10, 11 is provided with two dovetails 12, of which only one is visible in FIG. 3 and which are displaced in grooves 13 corresponding to the shape formed in the U-shaped case 14 of the insulating material. Each coupling mechanism 6 to 9 has one one-piece housing 14. As a result of the dovetail shape of the projections 12 and the grooves 13, the sliders 10, 11 are held in the housing 14 and can in no way fall out of it. sliding the sliders 10, 11 in the housing 14.

A longitudinal notch 15 is formed on the upper and lower sides of each sleeve 14, in which a strip 16 or 17, which is conventional in shape, is slidably mounted. As can be seen from FIG. 1, the rail 16, 17 is common to the coupling mechanisms 8,7 or 8, 9, which are located on the same frame side 1. As can be seen from FIGS. the dovetail protrusions 12 of the sliders 10, 11 directly of the rails 16, 17 and form part of the bottom of the notch 15 in the housing 14. Each rail 16, 17 is supported by two guide rails for each coupling mechanism 6 to 9! slots 18 intended for sliding the sliders 10, 11 and two guide slits 19 which are intended to move the sides 20 on both sides of the coupling mechanisms 6 to 9. As shown in FIG. 4, each guide slice 18, 19 consists of an inclined portion 18a, 19a , inclined to the longitudinal direction of the bar 18, 17 and moving away from the interior of the frame 1, and the longitudinal portion 18b, 19b, parallel to that direction. A pin 21 connected to the slide 10, 11, which carries the roller 22, extends into each guide cut-out 18. Similarly, to each guide cut-out 19, a follower 29 extends through the pin 23 of the side 20, which may be metal. The assembly is arranged such that, depending on the position of the rails 16, 17 (FIG. 1J, all the pins 21 of the sliders 10, 11 are in the inclined portion 18a of the guide slots 18 of the respective rails 16, 17 and all the pins 23 of the rails 20 are located in the longitudinal portion 19b of the guide cutouts 19, or all the pins 21 are located in the longitudinal portion 18b of the guide cutouts 18 and all the pegs 23 are in the inclined portion 19a of the guide cutouts 19. The sidewalls 23 cooperate with the guide means to enable them to translate in In addition, each pair of rails 16, 17 provided with the control device shown in FIG. 1 is schematically a lever 25, which allows the operator to move it longitudinally at a lateral position. the sliding of the sliders 10, 11 and the sidewalls 20, as will be explained in more detail below. The upper and lower sides of the connecting mechanisms 16, 17 of the coupling mechanisms 6 to 9 are held by a metal plate 26 ( Figures 3 and 5) There is a gap between the folded longitudinal edges of both metal plates 26, the height of which is greater than the thickness of the strongest printed circuit board 2; the plate 2 may have, on the edges, two clamping plates 27, whose thin edges 27 extend into said gap for the purpose of guiding the plate 2. In FIGS. 1 to 3 and 5 there is shown an insulating plate 28 from which the free ends 3a of the flexible contacts 3.

3 and 5, each elastic contact 3 is made of a metal spring wire, usually of circular cross-section.

The rigid end 3b of the flexible contact 3, which is adjacent to the protruding portion 3a coming out of the frame 1, passes through the housing 14a and abuts the flat bottom 29a of the groove 29 of the oblong cross section in the slider 10, 11, the flat bottom 29a being parallel to the plane P-Pa, when sliding the slider 10, 11, slides through the flexible end 3b of the elastic contact 3. For each spring contact 3, one groove 29 is arranged in the slider 10, 11 oriented perpendicular to the longitudinal dimension of the rails 16, 17, the width of which is only slightly greater than the thickness. 4. The groove 29 is limited by the sides of the two teeth 30 of the rectangular cross-section (FIG. 3). There is a sufficient gap between the opposing teeth 30 of the plugs 10, 11 to push the edge of the printed circuit board 2. The fixed end 3b of the flexible contact 3b terminates in a thread 3c which forms the plug of the elastic contact 3. releasing the resilient contact 3 with the bottom 29a of the groove 29 inclined by the ascending branch 3d, which grips the obtuse angle 3b with the fixed end 3b and passes the arcuate active portion 4 to which the inclined downward branch 3e is connected; the two inclined branches 3d, 3e form an obtuse angle with each other and are approximately symmetrical about the perpendicular to the groove 29a 29a. The inclined descent 3 passes into a movable end 3f which is almost perpendicular to the bottom 29a and is inserted and fixed in the blind hole 31 in day 29a. The resilient contact 3 has, in particular due to the existence of 216831-thread 3c, a spring bias so that its movable end 3f is still pressed against the nip hole 31, independently of the movements that the sliding action 10,11 acts on. Accordingly, when the slider 10, 11 is half-open (in FIG. 5 below) or closed (FIG. 5 above), the active part 4 does not reach or protrudes above the tooth tops 30 in dependence on a greater or lesser distance (between the stationary thread 3c and a movable end 3f which moves with the slider 10, 11.

As shown in FIG. 3, each sidewall 20 is provided with a through cut-out 32 facing the center of the frame 1. The outer edge 32a, the top edge 32b and the bottom edge 32c of the through-cut 32 are inclined or rounded by the insertion side of the plate 2 (according to Fig. 1dole) for easy insertion and centering of the plate 2. In each pair of sidewalls 20 facing each other in the same vertical plane of the direction A in Fig. 1, the distance of the outer edges 32a of the through cutouts 32 is larger or less than the width of the planar plate 2 according to the position in which the sidewalls 20 have been moved by the rails 16, 17. The described switching device operates as follows: assume initially that the rails 1.6, 17 engage the position shown in FIG. , 11 lies at the end of the inclined portions 18a of the guide cutouts 18 and the pins 23 of the sidewalls 20 lie at the end of the longitudinal portions 19b of the guide cutouts 19. Presumably, unlike 1, no plate 2 is inserted into the switching device. The pins 21 and, as a result, the sliders 10, 11 are in the position closest to the frame 1, as shown in the upper part of FIG. thus, the distance between the thread 3c and the movable end 3f is minimal, its active part 4 is at a maximum distance from the bottom 29a of the groove 29 and protrudes the sliders 30, 10, 11. For the durability of the flexible contacts 3 and the conductive tracks 5 of the printed circuit board 2 would therefore be dangerous to the plate 2 in the switching device. However, since the sidewalls 20 are also furthest away from the frame 1, there is a smaller gap between the outer edges 32 and the protruding through cutouts 32 than the width of the plate 2; as a result, it cannot serve or inadvertently insert the plate 2 into the frame 1.

By rotating the levers 25 in the direction of the arrows in FIG. 1 or by any other analogous control device, the operator must move the rails 16, 17 upwards from the position in FIG. 1 to the position shown in FIG. During the first part of this movement, the pins 23 extend through the longitudinal portions 19b of the guide cutouts 19, so that the sides 29 remain still. The pins 21 extend at the same time through the inclined portions 18a of the guide slits 18, whereby the sliders 10, 11 are displaced from the frame 1 inwardly and move from the position shown in the upper part of FIG. 5 to the position drawn in its lower part in which the distance between the threads 3c and the movable end 3f of the resilient contact 3 is maximum and its active part 4 lies entirely within the groove 29. Thus, all the flexible contacts 3 are forced to open. During the second portion of the movement, the pins 21 of the sliders 10, 11 extend through the longitudinal portions 18b of the guide grooves 18, so that the sliders 10, 11 remain stationary. At the same time, the pins 23 extend through the inclined portions 19a of the guide grooves 19 so that the sidewall 20 takes up the position closest to the frame 1. The operator can insert a plate 2 into the frame 1, which is facilitated by the chamfered or rounded edge shapes 32a, 32b, 32c 32 (Figure 3).

As soon as the plate 2 comes into the working position according to FIG. 1, the operator turns the levers 25 in the direction opposite the arrows of FIG. 1. This causes the same movements, but in the reverse order: the sides 20 first approach each other so as to block plate 2, which for this purpose is provided with notches 39 (FIG. 1), where the sides 20 can penetrate, whereupon the plug 10, 11 is moved away from the center of the frame 1 so that the spring contacts 3 (top in FIG. ). Thus, the elastic contacts 3 are closed with a resilient force due to their geometrical shape and resilience and to the travel path of the sliders 10, 11. At least a first part of the described operations is performed to remove the plate 2, namely opening the flexible contacts 3 and then unlocking the plate 2 by sliding the sidewalls. 20.

The self-cleaning effect of the device of the invention is explained in Fig. 6a, showing the flexible contact 3 in the open position, and Fig. 6b in the on position. If we imagine a triangle whose two sides are formed by sloping branches 3d, 3e of elastic contact 3, it is clear that shifting the slider 10 from the position in Fig. 6a to the position in Fig. 6b shortens the length of the third thought side of the triangle from the value "L" to the value "1" and at the same time extends the height triggered to this third side from "h" to "H". This increase in height first causes the contact of the active part 4 with the conduit 5 (the dashed line in FIG. 6b) and then the slight displacement of the active part 4 with the flooding path 5, accompanied by an increase in the contact pressure (up to the position shown in FIG. 6-b solid line). This is explained by the fact that the thread 3c approaches the case 14 as a result of the pressure applied to the upwardly sloping branch 3d, the transition from the open position (Fig. 6a) to the position closed (Fig. 6b) and simultaneously increases the diameter. Thus, the ascending oblique portion 3d is shortened, allowing displacement of the downwardly sloping branch 3e terminating in the active portion 4, without deforming from the position shown in Fig. 6b to the position indicated by the solid line. It indicates that the active part 4 contacts the conductive path 5 of the plate 2 along the length d, between the two perpendicular positions. In order to facilitate the deformation of the thread 3c, it is advantageous not to abut the occlusion 10, as opposed to FIGS. 3 and 5. 216831 10

FIG. 7, 8 and 9 show three embodiments differing from each other and from the previous ones. FIGS. 7 to 9 show reference numerals which are enlarged by 40, 50 and 60 parts corresponding to parts 3, 3a, 3b, 3c, 3d, 3s, 3f, 4 of FIG. 3, 5, 6a, 6b.

On the basis of the previous structures, the resilient contacts 43, 53, 63 are not provided with a hinge 3c, which may be disadvantageous if the flowing currents having a high frequency, but the resilient movements 43c, 53c, 63c, each of which is formed by at least two curves of opposite curvature. Such elastic folds form hinges and have, among other things, the advantage of being less threaded. The housing 14 may be provided with a groove 14a perpendicular to the grooves 13c, 53c, 63c in the spring 43c, 53c, 63c so that the elastic recesses 43c, 53c, 63c do not contact the housing 14a and do not lose the possibility of deformation. For the same reason, the slider 10 and the flexible contact 43, 53, 63 are formed such that the groove bottom 29a remains away from the sloping rise 43d, 53d, 63d of the flexible contact 43, 53, 63.

Elastic Contact 43 to cbr. 7 is formed by a circular cross-section or a strand whose movable end 43f is embedded in the blind aperture 31 in the slider 10 as in FIGS. 3, 5a, 6b. According to a non-illustrated example, where the assembly is not expected to be assembled and, if necessary, re-assembled, the movable ends 4.3 'can be fixed either by flowing into the blind holes 31 which are pre-imprinted for this purpose, or by inserting the movable ends 43f into. the wall of the plug 10.

The resilient contact 53 in FIG. 8 is also formed by a circular profile wire, but its end is anchored in another way. For this purpose, it is provided at its free end with two clamping threads 55 forming two lateral protrusions which engage the rib 5B extending into the groove 29 perpendicular to its bottom 29a. Analogously to the foregoing, the prestressed spring contact 53 pushes the clamping thread 55 onto the bottom 29a of the groove 29.

Elastic Contact 63 to cbr. 9 is formed by a metal strip. At its movable end, the lateral cut-out 64a, which engages, 65 in a manner analogous to that of FIG. 8, is a rib 56. In the metal strip forming the resilient contact63, a plurality of longitudinal notches 66 extend at the level of the active portion 64 up to the inclined the branches 63d and 63c, thereby forming a plurality of contact areas between the elastic contact 63 and the conductive path 5 of the plate 2, as defined by these slits 63.

As in the cases shown in Figs. 6a, 6ib, the resilient contact 43, 53, 63 in Figs. 7, 8, 9 is biased and its fixed movable end is still pressed to the bottom 29a of the groove 29 in the slider 10. on the other hand, the storage and replacement of the elastic contacts is facilitated. Although the thread 3c of FIGS. 3, 5, 6a, 6b is omitted, the switching device of FIGS. 7, 8, 9 is automatically cleaned, as will be explained in connection with FIGS. 10a, 10b, if the same reference is left to the same. As soon as the slider 10 moves from the position in Fig. 11b to the position in Fig. 10b, the active part 44 is first raised, as already explained in Figs. 6a, 6b, until it touches the conductive track 5 of the plate 2 10b, whereupon the resilient contact 43 is deformed in particular at the position of the elastic fold 43c; the inclined downward branch 43e of the adjoining active portion 44 is displaceably displaced to provide urine cleaning of the contact surfaces.

11-a, 11b and cbr. 12a, 12b, 12c illustrate an improved switchgear structure where the slide 10 engages the flexible contact 43, 73 and slides with it at the end of the slide.

FIG. Figures 11a, 11b illustrate this improved embodiment applied as an example of a switching mecha, which is otherwise identical to the embodiment of Figures 7, 10a, 10b. The two inclined branches 43d, 43e of the elastic contact 4.3 are connected by a thread 46 which at the same time forms the active part 44 and a support surface for the rib 47 of the slider IQ which engages and threads the connecting thread 46. Rib 47 preferably has an angle of about 903 with the bottom 29a The positions in FIGS. 11a, 11b correspond to the respective positions in FIGS. 10a, 10b. 11a, the web 47 automatically carries a thread 46, the active part 44 of which slides along the pathway 5 of the plate 2 under increasing pressure. The thread 46, the advantage of which is to create a double contact with the conductive track 5, may be compensated for by another deformation of the elastic contact 43 or by another system cooperating with the rib 47. The slope of the rib 47 'increases the pressure of the thread 46 on the conductive track 5.

FIG. Figures 12a, 12b, 12c show a variation of the embodiment and use the parts analogous to those in Figures 10a, 10b of the same reference numerals increased by 30. In addition to the resilient fold 73c forming the hinge, the elastic contact 73 of Fig. 12a 12b, 12c is an elastic bias 73h which is disposed between the wall of the case 14 and the insulating pad 75, which is displaceable parallel to the slider 10. The elastic contact 73 is provided between the elastic bias 73h and the inclined upward bough 73d which is clamped in the insulating pad 75. The insulating pad 75 is pressurized either by the resilient fold 73h or by the non-illustrated outer resilient elements 76 to the stop 76 in the direction of the decoupling motion slide 10, and lies in the path of the slide 10 which it it carries with it when moving in sense.

FIG. 12a shows the device in the open position when the active part 74 is spaced apart 2. If the slider 10 is moved from left to right, the pad 75 remains initially resiliently pressed against the stop 76 and a portion of the resilient member.

Claims (8)

216831 11 12 of the contact 73 comprising the inclined branches 73d, 73e begins to deform in the same manner as in Figs. 10a, 10b until the position of Fig. 12b, when the active part 74 initially flexes the conductive tracks 5 on the plate 2, while self-cleaning is started, whereupon The slide 10 continues to move to the position of Fig. 12c. Between the positions shown in Figs. 12b and 12c, the inclined branches 73d, 73e do not deform, and the active portion 74 remains resting on the watercourse 5 still the same elastic force. At the same time, the insulating pad 75 is entrained in the sleeve 10 to the right, with the slightly squeezed elastic pleat 73h and the active part 74 overlapping the same distance, thereby ensuring automatic cleaning. In the foregoing, the thread-forming portions 3c or the flexible cams 43c, 53c, 63c, 73c have been described. Another example of carrying out these hinge parts is shown in Figs. 13a, 13b, where parts analogous to Figs. 6ia, 6b are indicated by reference numerals increased by 80. In this case, the ascending the branch 83d in the vicinity of the housing 14 is much longer and arched, so that it has more flexibility than the sloping downward branch 83e adjoining the movable anchored end 83f which is straight. When the slider 10 moves from the position of Fig. 13a to the top of Fig. 13b, the active portion 84 first touches the conductive track 5 of the plate 2 and then slides along with the increase in the inclination of the inclined ascending branch 83d, the portion 83c of which forms a hinge . In all the examples described in connection with the drawings, the device was intended to electrically connect the conductive paths 5 of the surface connections to the plate 2 with the elastic contacts 3, 43, 53, 63, 73, 83 which are supported by the frame 1 connected to the housing 14, The plate 1 and the plate 2 can be replaced by two insulating rigid pads, of which the elastic contacts and the second conductive paths are arranged, the pads being adapted such that one fits into the other parallel to the insertion and removal direction. Thus, cylindrical or rectangular plug-in connectors can be realized. Since such connectors of the known type do not, the application of the flexible contacts according to the invention to such connectors does not bring any difficulties for the person skilled in the art; therefore, it is not considered necessary to display such improved connectors in the drawings. The invention is not limited to the described and illustrated embodiments. For example, the switching device could comprise a different number of switching mechanisms than two at least one frame 1 parallel to the direction A in FIG. In addition, they can also be mounted on the frame side against the insertion side, that is to say on the side in FIG. The distance between the curved edges of the plate plates 26 could not only be greater than the thickness of the thickest plate 2, but enlarged so as to allow the resilient contacts 3 to be removed for replacement. In most embodiments, each resilient contact 3 has a single active portion 4 forming a contact area. The number of tactile areas can be increased by any of the following: using a wire with such a bend that, when assembling a contact, the bend in a certain length aligns in a straight line, thereby creating a linear contact surface, using a corrugated wire where the peak of each wave it touches the conductive track or by creating a wave shape so that, after assembly, the linear contact surface between the two wave layers is formed, using a helical coil with a constant profile whose cross section can be round, square, etc., or two or more wires, optionally 9, 11a, 11b, respectively, are mutually twisted, while maintaining a continuous profile, or finally forming a flexible contact. PftEDMĚT An electrical switching device comprising a rigid insulating support for guiding a sliding rigid insulating pad provided with conductive connecting tracks, wherein the carrier of the non-uniformly flexible contacts which are firmly fixed to the one end and resiliently contact their active area with the conductive connecting tracks of the insulating pad the actuating mechanism actuated by the operator and actuating the resilient contacts in the sense of switching and disengaging, characterized in that the actuating mechanism is formed by at least one movable slide (10, pour, on wherein a second flexible contact end (3f, 43f, 53f, 63f, 73f, 83f, J) (3, 43, 53,63, 73, 83 J and each resilient contact (3, 43, 53, 63, 73, 83J has between the hinge-forming portion and the movable end (3f, 43f, 53f, 63f, 73f, 83f) anchored in the slider (10, lij two substantially straight branches (3d, 3e, 43d, 43e, 53d, '53e, 63d, 63e, 73d, 73e, 83d, 83e) which are inclined relative to each other and to the plane of the movable slide (10, 11i and whose connection forms the active part (4, 44, 54, 64, 74, 84) of the flexible tact (3, 43, 53, 63, 73, 83). Electrical switching device according to claim 1, characterized in that the movable end (3f, 43f, 73f, 83f) of the resilient contact (3, 43, 73,83) is inserted into the sliding opening (31) of the slider (10, 10 ' hinge. 3. An electrical switching device according to claim 1, characterized in that the carrier is formed by a printed circuit board (1) in which a printed circuit board 216831 13 14 (2) forming an insulating support is slidably guided. An electrical switching device according to one of Claims 1 to 3, characterized in that the closure plug (10, 11) is provided with an additional part, for example a rib (47), for engagement with a part of the flexible contact ( 43) during switching movement. 5. Electrical switching device according to claim 4, characterized in that the two inclined branches (43d, 43e) of the elastic contact (43) are connected by a thread (46) which forms its active part (44) and at the same time a contact surface. for the rib (47) of the slide (10, 11). • 6. Electrical switching device according to claim 5, characterized in that the rib (47) is substantially perpendicular to the bottom (29a) of the groove (29) in which a resilient contact (43) is freely mounted. 7. The electrical switching device according to claim 3, characterized in that the resilient contact (73) is interlocked between its fixed end (73b) in the frame (1) and between the hinge-forming part by a flexible fold (73h). , consisting of two consecutive opposite-curve arcs, and a section (73g) clamped in an auxiliary insulating pad (75) which is slidable parallel to the slider path (10, 11) and abuts a portion of its movement path to a fixed stop (76 |). 8. The electrical switching device according to claim 1, characterized in that the part forming the hinged contact (3) consists of a thread (3c). 9. An electrical switching device according to claim 1, wherein the hinge portion of the resilient contact (43) comprises at least two arcs of opposite curvature. 6 sheets of drawings