DE7504400U - Electric switch - Google Patents

Description

Patent attorney DIPL.-ING.BERTHOLD SCHMID STUTTGART 1 · FALBENHENNBNSTRASSE 17 ■ TELEPHONE (0711) 608893 UNSBB ZBICKBN

11 606 B / Vo

company

J. & J. Marquardt

7201 Rietheim

Electrical · switch

The invention relates to an electrical switch with at least one approximately U-shaped resilient contact bridge and a cam-like actuating member wherein the one, U-legs which can be placed against an eye contact are pivotably mounted and the other is resiliently pressed against the actuator. Switches of this type are already known per se. They are primarily used as a device switch for electrical household and work equipment. In particular In the case of household appliances, there is usually very little space available for the switch or switches. On the other hand should the switch, however, must be robust and durable, which

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is reflected in the corresponding dimensions. This applies above all to the contact bridge, which is exposed to high electrical, thermal and mechanical loads is. In switches of this type that have become known to date, it is made from leaf spring material. With regard to to the loads mentioned, the Pederbreite must be selected to be relatively large., This then leads to a correspondingly wide switch housing.

Accordingly, the object of the present invention is to provide such an electrical switch which without having electrical and mechanical disadvantages, gets by with an extremely narrow switch housing.

To solve the problem, an electrical switch of the type mentioned at the beginning is proposed according to the invention is characterized in that the contact bridge made of wire with preferably circular, rectangular or square cross-section with especially slightly rounded longitudinal edges and located on both sides parallel to the swivel plane running switch housing walls is performed. The wire, of course, has good electrical conductivity just edit and

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Its width is for circular and square cross-sections as well as comparatively the same cross-sectional area significantly smaller than that of a leaf spring. This also applies to a rectangular cross-section if the rectangle preferably deviates only slightly from a square. Accordingly, the switch housing can be kept very narrow and this is particularly effective when the electrical switch as a two-pole and multi-pole switch.

In a particularly preferred embodiment of the invention, this is designed in particular as a bearing cutting edge Tilt bearing of the contact bridge in one piece with a switch terminal or the like, which of course leads to reduced production and assembly costs.

A further development of the invention is that the pivotably mounted U-leg as a two-armed lever is preferably formed about the same length lever arms, the one lever arm formed duröh the free leg end carries a movable contact. The other lever arm can act as a stop member for in this case take over the open switch position. In switches of this type, as is known, both the movement of the contact bridge as well as especially designed as a rocker switch

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Deten actuator limited in both switching directions. In addition, the U-leg facing the actuating cam forms a spiral spring which is always tensioned in every pivot position is, their voltage initially increasing when switching. Depending on the design of the switchgear, one can achieve a Snap action. Such is also provided in particular in the switch according to the invention.

A variant of the invention consists in that the other lever arm dos double-armed lever has an additional movable one Contact carries. In this case, the switch is to be used as a changeover switch and it has three terminals or the like per rear derailleur. The outer ones are provided with the mating contacts designed as plague contacts, preferably made in one piece while the tilting bearing for the contact bridge is attached to the middle, in particular is molded.

In another embodiment of the invention are at least two jointly actuatable contact bridges arranged in parallel planes are present, d. H. this switch is as a two pole Switch trained. This is where the narrow one has an effect

The design of each rear derailleur is particularly strong. On the other hand, because of the laterally leading the contact bridge Switch housing walls ensure a good electrical separation of the two switching mechanisms.

Another feature of the invention is that the switch housing has three adjacent chambers, the outer one each having a contact bridge and the inner one, preferably subdivided, a series resistor and take up lines for a glow or incandescent lamp, and that the hood-like actuator is translucent is. The latter is usually made of transparent red plastic and takes the glow or incandescent lamp on. In the preferred case of a subdivided central chamber, the subdivision can be made with the aid of a central wall make which is lower than the two chamber side walls. Your free end can be used in an advantageous manner can be used to support a lamp series resistor. The two remaining halls in the middle chamber are used for electrically isolated accommodation of the various Lines of the series resistor and the glow lamp or the incandescent lamp.

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Two exemplary embodiments of the invention are shown in the drawing. Show it:

Fig. 1 A first embodiment of the invention in one vertical longitudinal center section;

Pig. 2 shows a section along the line II-II of FIG. 1; 3 shows a longitudinal center section corresponding to FIG. 1 of a second embodiment.

The switch housing 1, designed in the form of a hollow cuboid open at the top, has an outwardly protruding all-round fastening collar 2 for support on the edge, for example, of a housing opening of an electrical device (not shown), preferably a household appliance. The housing opening 3 is closed by means of a switching rocker in ¹ I wesentliehen. This has a hood-like shape and it consists of, for. B. red translucent material. For pivoting mounting, a bearing pin 6 is formed on each of the two longitudinal side walls 5 of the rocker switch Ί. Each engages in a bearing bore 7 of the associated switch housing wall 8. The switch housing 1 is so elastic that a corresponding expansion of the joint

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housing and snapping engagement of the bearing pin 6 possible is. To facilitate assembly, the two bearing journals are at their front end in the assembly direction 9 10 lightly embossed.

The bearing side walls 5 each have a central ins The molded extension 11 facing the inside of the switch has a cam-like actuating member 12 at its free end for the contact bridge 13 is located. The embodiment is a two-pole switch. In the I-alle, a single-pole switch is sufficient, of course a single cam-like actuator or approach 11 from, but one is in terms of storage and tool costs also in this case give preference to the version with two actuators.

The contact bridge 13 is essentially U-shaped. One of its U-legs Ik carries at its free end a movable contact 15 »which cooperates with a stationary mating contact 16. A cutter bearing 17 is formed approximately in the middle of this U-leg. It is placed on a fixed bearing edge 18, which penetrates to a bottom 19 of the switch housing 1

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Connection element 20 is integrally formed. The mating contact 16 is produced in a similar manner in one piece with a further connection element 21, which is also riveted into the base 19. Of course, ¹ ^ are electrically conductive.

According to the invention, the contact bridge 13 is made of wire with a preferably circular cross-section and, like T? Ig.2, is particularly clear, held on both sides by housing walls running parallel to the pivot plane or guided during switching. The two parallel switch housing walls 8 and two additional partition walls 2k and 25 located inside the switch housing 1 are used to form corresponding chambers 22 and 23. A series resistor 28 for a glow lamp 29 rests on the free end of this central wall, which is supported on the free, somewhat shaped ends of the partition walls 2k and 25. By means of the switch housing walls 8, the partition walls 2k and 25 and the central wall 27, the glow lamp 29, the series resistor 28 and of course the two contact bridges 13 are held in a shockproof manner and electrically insulated from one another in a perfect manner. The latter is true

also for the different ones for the glow lamp and the series resistor leading electrical lines. Overall, this creates a very compact one above all, extremely narrow illuminated two-pole electrical switch. To increase the electrical An insulating partition wall 30 is also provided at the bottom for safety.

In particular from Fig. 1 it can be clearly seen that the after externally passed line ends of the lines leading to the glow lamp and the series resistor in clamping devices 32 are held, which are also formed on the connecting elements. Undoubtedly carries too this construction for the cheaper this Schaltars.

When in Fi?;. 3, the connection element 20 of FIG. 2 is replaced by two connection elements 33 and 3 ¹ *. The latter is produced together with the bearing cutter 13 while the former carries a further mating contact 35 or forms. This works with a second movable contact 35 of the contact bridge

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together. It is in the area of the arcuate connecting piece 36 at the free end of the lever arm 37 of the one below a U-leg 1Ί attached. With a simpler one This switch eliminates the need to attach separate high-quality contacts 15 and 35.

The other U-leg 38, which is kept a little shorter, is depressed by the cam-like actuator 12, so that the contact bridge 13 is permanently under a mechanical There is tension. When pressing down the left end of the rocker

39 and the resulting pivoting movement of the cam-like BetStigungsglieder 12 in the direction of the arrow

40 this voltage increases until the switchover position is reached. Switching is preferably done with a snap and the switch is bistable. If you put the free end of the U-leg 3Ö against its cam-like actuator bends over (Fig. 3) or forms a slightly curved shape, the contacts are lifted off later when the rocker switch is moved and more spontaneous.

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Claims (1)

.-ft ί J - 11 claims 1. Electrical switch with at least one approximately U-shaped, resilient contact bridge and a cam-like actuating member, one of which is pivotably mounted on a counter contact and the other is resiliently pressed on the actuating member _s characterized in that the contact bridge (13) made of wire with preferably circular, rectangular or square cross-section with especially slightly rounded longitudinal edges and ^{is guided on both sides by S-holder housing walls (8, 2 1} », 25) running parallel to the pivot plane (30). 2. Switch according to claim 1, characterized in that the particular designed as a bearing cutter (18) The tilting bearing of the contact bridge (13) is made in one piece with a switch terminal (20, 3 * 0 or the like. 3. Switch according to claim 1 or 2, characterized in that the pivotably mounted U-leg (1 * 0 as a two-armed Lever with preferably about the same length of lever - 12 - I ff 1 poor is designed, wherein the one lever arm formed by the free leg end has a movable contact (15) carries. k. Switch according to Claim 3, characterized in that the other lever arm (37) of the double-armed Htb ^ ls (I ² O carries an additional movable contact (35). 5. Switch according to one or more of the preceding claims, characterized in that at least two Contact bridges (13) which are arranged in parallel planes and can be operated jointly are present. 6. Switch according to one or more of the preceding claims, characterized. That the switch housing (1) has three adjacent chambers (22, 23, 26), the outer (22, 23) each oine contact bridge (13) and the inner, preferably partially subdivided (27) accommodate a series resistor (;? 8) and lines (3 "-O for a glow or incandescent lamp (19), and that the hood-like actuator (5) is translucent. 7504400 at June 5th, 1995