DE3150121C2 - Contact arrangement - Google Patents

Abstract

In the case of a contact arrangement, a conductor track is applied to a carrier plate. This is contacted by a terminal lug attached to the carrier plate. In order to ensure reliable contacting even in the event of thermal cycling with or without moisture and during the soldering process and to set up the contact arrangement in a simple manner, the terminal lug has an area freely arching over the carrier plate. In the center of this area, a rivet holds the terminal lug on the carrier plate. An edge of this area spaced from the center rests on the conductor track.

Description

The invention relates to a contact arrangement in which a conductor track is applied to a carrier plate is, which is contacted by a terminal lug fastened to the carrier plate by means of a rivet, wherein the terminal lug has a region freely arching over the carrier plate and one from the center of the Overarching area spaced edge of the connecting lug under spring action on the conductor track gets up.

Such a contact arrangement is described in DE-OS 19 33 432. With this contact arrangement the arching area of the terminal lug is made up of a front part and resilient tabs. The tabs create an elastic force that acts as a fulcrum around the rivet. This will make the rear Part of the terminal lug pushed away from the carrier plate, while the front part with its edge the conductor track is pressed. The contact between the terminal lug and the conductor track is only made on one Line, i.e. a comparatively small area.

Another contact arrangement is described in DE-GM 18 30 876. In this case, a contact pin is supported by a spring on a resistance track. i ^ uiTiil · sch sin iiinrciCiiCriviCr! -voniQiCiviruciv ucs / -vn locking pin on the conductor track must be permanently ensured. This arrangement is expensive to build and assemble, since a separate spring element and a component for holding it must be provided on the contact pin. Another disadvantage of this arrangement is that the current flow takes place via two contact points, which are both loose and only make contact under the action of the spring.

In DE-GM 74 38 711 a connection contact is described which is held with bent tabs on the carrier plate. With a 1 temperature change, this arrangement can loosen.
The object of the invention is to propose a contact arrangement of the type mentioned at the outset which ensures reliable contacting in the event of thermal cycling, in moisture and also after a soldering process and which requires little construction and assembly effort

According to the invention, the above object is achieved in that the rivet is in the center of the arching area the terminal lug on the carrier plate holds and that the edge surrounding the arching area on the conductor track stands up, the overarching area itself acts resiliently due to the distance between the center at which the arching over the carrier plate Area is fixed to the edge standing on the conductor track, this can be soldering process or temperature dependent Perform stretching movements without causing loosening that would worsen the contact can come. The rivet fixes the terminal lug on the carrier plate without the overarching one Area to be pressed rigidly to the carrier plate. The rivet leaves a limited area to the arching area Room for expansion. Fluctuations in the thickness of the carrier plate are compensated for. In particular Shrinkage or swellings that are dependent on temperature and humidity are also absorbed. These thus do not lead to a loosening of the contact.

With the invention, there is no need for a separate spring element and its separate attachment. The connection flag itself takes over the spring action by means of its area arching over the carrier plate. The rivet on the one hand fixes the terminal lug on the carrier plate and on the other hand holds the arching area below Bias on the conductor track.

Because the terminal lug and the rivet are separate components, each of these components can be made from the produce material that is favorable for its function.

Advantageous refinements of the invention emerge from the subclaims. In the drawing one Embodiment of the invention shows

F i g. 1 is a partial plan view of a circuit board and

F i g. 2 shows a section along the line U-II according to FIG. 1.

A conductor track 2 in the form of a conductive silver layer is applied to a carrier plate 1. In Fig. 1 are two Connection fields 2 ', 2 "of the conductor track 2 are shown. In the illustration according to FIG. 1, one of the connection fields 2 "a connection lug 3 is attached.

The connection lug 3 has a contact pin 4 and an arch over the carrier plate 1 at the connection field 2 ″ Area 5. In the center of the arching area 5, a bore 6 is provided, which with a hole 7 of the support plate 1 is approximately aligned. On the outside of the arching area 5, an edge 8 runs in a circle around. This stands on the connection field 2 ″. The edge 8 ends in a square outer contour 9. Instead of the circumferential edge 8, two par-

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Following the edge 8, the terminal lug 3 to the contact pin 4 has a bend 10, which is a Edge Γ of the carrier plate 1 overlaps and forms a stop of the terminal lug 3 on the carrier plate 1. A rivet 11, which fixes the connecting lug 3 to the carrier plate 1, is seated in the bores 6 and 7. Opposite to the initial curvature of the carrier plate 1 over-

In the bulging areas 5, the rivet 11 presses the bulge down slightly so that the edge 8 rests firmly on the connection field 2 ". When the rivet 11 is attached, a distance a remains between your area 5 and the firing field 2". A distance b remains between the rivet 11 and the edge 8.

The rivet 11 consists of a soft material, the connecting lug 3 made of spring-hard bronze.

The contact arrangement described consists, apart from the printed circuit board 1, 2 of two components, namely the terminal lug 3 and the rivet 11. Nevertheless, this contact arrangement is permanently susceptible to temperature changes. This can be attributed to the fact that the edge 8 over the distance b or the distance a is spaced from the fixed point given by the rivet 11, so that it can compensate for temperature and moisture-dependent expansions or shrinkages of the carrier plate 1, thus avoiding loosening of the contact. This is ensured in the long term, since the curvature of the area 5 together with the spring-hard material of the connecting lug 3 creates a spring elasticity. The soft material of the rivet 11 compared to the spring-hard material of the connecting lug 3 facilitates the riveting process.

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Claims (4)

Patent claims: 1. Contact arrangement in which a conductor track is applied to a carrier plate, which is from a is contacted on the carrier plate attached by means of a rivet terminal lug, the terminal lug has a free arching over the carrier plate and one from the center of the arching The edge of the terminal lug, which is at a distance from one another, rests on the conductor track under the action of a spring, characterized in that the rivet (11) in the center of the arching area (5) holds the connecting lug (3) on the carrier plate (1) and that the edge (8) running around the arching area stands up on the conductor track (2 "), wherein the overarching area itself is resilient 2. Contact arrangement according to claim 1, characterized in that the arching area (5) circularly around a bore (6) for receiving the rivet (11) 3. Contact arrangement according to claim 1 or 2, characterized in that between the arching area (5) and a contact pin (4) of the connecting lug (3) an angled portion (10) is provided, which at one edge (V) of the carrier plate (1 ) is present. 4. Contact arrangement according to one of the preceding claims, characterized in that the Terminal lug (3) made of a spring-hard material and the rivet (11) made of a soft material Material consists.