FR2625029A1 - Electrical switch for a motor-vehicle dashboard - Google Patents

Abstract

Electrical switch for a motor-vehicle dashboard, characterised in that it is constituted by a main body in the form of a prismatic case 26, on the upper base of which a button 30 has been mounted, this case 26 being extended in its lower part by another prismatic unit 27 of smaller width and without the lower base, but equipped with lateral reinforcing ribs, there being terminals 24 and 25 and a pusher 42 inside the said case 26, the lower ends of these terminals 24 and 25 being aligned with the lower edge of the unit 27.

Description

 As a result of its incessant innovation in terms of new models as well as back-up mechanisms for them, the automotive industry increasingly demands technical solutions to the small problems it encounters every day.

 A result of this work of innovation is the small electrical apparatus, more precisely the small switches whose frequent use increases the requirement from the performance point of view; it is therefore necessary to implement good values as regards the contact pressure and the interruption time.

 The long experience in which we are the custodian in this area has shown that failures with regard to small switches are basically due to their repeated use, which causes an early weakening of the contact carrier parts, in the sense that they lose energy. efficiency and begin not to exert all the necessary pressure allowing the contact points to tighten strongly when the electrical circuit is closed.

 When good contacts do not occur, a deceleration of the connection and disconnection time appears, which creates a significant value of the short-circuit intensity and, consequently, the contacts burn out and many times the switch Him -Even too.

 To remedy the above drawbacks, the switch forming the subject of the present invention has been devised, which is constituted on the outside by a prismatic block, on its upper base being the button, the lower extending on a another prismatic block of smaller width and height, with lateral triangular ribs.

 For mounting the switch on the automobile dashboard, appendices are provided on the lateral faces of the exterior surface of the prismatic box, horizontal and vertical edges being also provided on the front and rear faces of the prismatic box. prism. Inside this prismatic box are vertically housed lugs as well as a pusher and contact elements annexed to the aforementioned lugs.

 The pusher mounted inside the prismatic bottle undergoes a vertical movement thanks to the movement of the button on this pusher, which in turn acts on the contact-carrying part mounted on one of the lugs, this movement being guided by ramps on which the pusher slides while forcing the points of contact to meet.

 The contact piece is formed by a thin metal strip fitted into the upper part of the terminal where the contact point is located, the contact holder having a central hole (except on its upper part) from which an appendage extends. curve.

 Other data and characteristics of the switch according to the invention will be highlighted during the description which is given below, in which reference is made to the drawings attached to this memo where, in a somewhat schematic manner , the preferred data are shown. These data are provided by way of example, reference being made to a possible case of practical realization, but without being limited to the data which are exposed there. Consequently, this description must be taken into account from an illustrative point of view and without any kind of limitation.

 Figure 1 is a cross section in elevation of the switch.

 Figure 2 is an external elevation side view.

 Figure 3 is a perspective view of the terminal with the contact carrier parts.

 Figure 4 is a front elevational view of the switch.

 According to one of its embodiments, the switch according to the invention comprises a main body in the form of a prismatic box (26) on the upper base of which is a button (30) with two positions, which switches on the body (26) by means of pins (37) which emerge from the inner surface of the lateral faces (44) of said button, to fit into as many holes drilled on the front and rear faces of the body (26). This button (30) is coupled to a pusher (42) by means of the guide point (36) thereof fitted into the notch (35) formed in the side skirts of the button (30).

 Appendages (28), four in total, and ledges (32) emerge from the main body (26) and its lateral faces, ledges (29) emerging from the front and rear faces; these appendages and ledges (28) ,.

(32) and (29) contribute to fitting the body of the switch (26) into the dashboard of the automobile.

 The main body (26) is extended in its lower part by another prismatic body of smaller width (27) reinforced by ribs (33). Lugs (24) and (25) protrude from the upper base of this body (27) to the lowest plane thereof; see fig. 1 and 2)..

 Inside the main body (26) are mounted the lugs (24 and 25), of a different nature, as can be seen in FIG. 1, the terminal (24) shown in fig. 3 being formed by a first flat lower chamfered part on its lower part to facilitate electromechanical engagement. In this first part formed by a flat metal blade (13) was practiced a series of small lateral notches (19), (20), (21) and (22) and central (22) and (23) which facilitate assembly of the terminal inside the bodies (26) and (27). Appendages (17) and (11) project from the upper part (10) of the terminal (24) at a right angle.

 The contact-carrying parts (12) are mounted on the appendages (17) using notches (16) and (23) provided therein.

 Each contact carrier (12) is formed by a small thin blade provided with a central hole which empties it, except in the upper part from which emerges the curved appendage (14), the lower end of which fits into the 'notch (16) of the appendages (17).

 The contact (15) is placed in the center of the upper part of the contact carrier (12), the lower part ending in a flange (18) and stembooit by it in a notch (23).

 For the opening and closing of the corresponding electric cooked calls, the pusher (42) has been provided, formed by a flat blade of dielectric material, provided at its lower end with a flange (40) and at its middle part with appendages. triangular (43) and a point (31), thus allowing movement of this pusher (42) with the button (30).

 The pusher (42) acts on the contact carrier (12) as soon as the tip (31) acts on the rear face of the appendix (14) by forcing the contact point (15) to join the contact point (32 ) of the terminal (25) following the displacement of the contact holder (12) towards the front by torsion, this contact holder (12) returning to its starting position when the pusher (42) rises.

 In turn, to promote the pressure of. the point (31) on the pusher (12), the prismatic box (26) is provided inside two ramps (41) and (45) which, combined with the flange (40) of said pusher (42), constrain the latter to make a forward or backward movement transversely as a function of the vertical movement of ascent and descent when the flange (40) slides on the ramps (45) and (41).

 In parallel, in order to avoid unwanted lateral movements, the appendage (40) is guided in a slide (46) formed in the sides of the body (26).

 Having seen the drawings and read the explanation relating thereto, it will be understood that the invention allows a simple and effective construction which can be implemented very easily, which undoubtedly constitutes an industrial result due to the marked increase in the pressure between the contacts placed face to face (15) and (32) and, indirectly, in the disconnection time between them.

 It should moreover be understood that the foregoing description has been given only by way of example and that it in no way limits the field of the invention from which one would not depart by replacing the execution details described by all other equivalents.

Claims (7)

R E V E N D I C A T I 0 N S CLAIMS  1. Electric switch for a dashboard of motor vehicles, characterized in that it is constituted by a main body in the form of a prismatic box (26), on the upper base of which a button (30) has been mounted , this box (26) extending in its lower part by another prismatic block (27) of smaller width and devoid of lower base but provided with lateral reinforcing ribs (33), inside said box (26) there are lugs (24) and (25) and a pusher (42), the lower ends of these lugs (24) and (25) being aligned with the lower edge of the block (27).  2. Switch according to claim 1, characterized in that the button (30) is mounted on the body (26) by means of cylindrical pins (37) of small height, which penetrate as many holes, drilled on the front faces and rear of said body (26), the pusher (42) having a notch (35) and a guide holder (36) located in the side skirts of the button (30).  3. Switch according to claim 1, characterized in that the side faces of the box (26) have fixing appendices, four in total, and a flange (32), while the front and rear faces have corresponding flanges ( 29).  4. Switch according to claim 1, characterized in that the internal surfaces of the lateral faces of the box (26) are provided with two ramps (41) and (45) inside a slide (46).  5. Switch according to claim 1, characterized in that the pusher (42) is formed by a blade of dielectric material provided at its lower end with a flange (40) and on its middle part of triangular appendages (43) and a point (31), at an angle of 900 with said blade.  6. Switch according to claim 1, characterized in that the terminal (24) has a first flat part (13) whose lower edge is chamfered, its lateral faces having notches (19), (21) and (20) while that its central part has holes (22), a second equally flat middle part from which two appendages (17) emerge which form an angle of 900, these appendages (17) housing fixing notches (23) and (16) , and finally a third flat upper part (10) from which emerge angled appendages (11).  7. Switch according to claim 6, characterized in that in the notches (16) and (23) is mounted a contact carrier (12) formed by a thin metal blade provided with a central notch, except on its upper part d 'where a curved appendage (14) emerges, a contact (15) being placed on the upper part of this contact carrier (12), which ends in its lower part by a flange (18).