DE1038160B - Method for attaching the contact piece of electrical switchgear to its carrier by soldering - Google Patents

Description

GERMAN

The attachment of an electrical contact piece to its carrier can be done by screws, rivets, Welding or soldering are done. The use of screws assumes the presence of a sufficient one Material thickness ahead, which is usually not the case with contact pieces for lower currents. Even a screw fastening has the disadvantage that the current transfer does not take place over the entire bearing surface. The same applies to the riveted connection. You therefore have the connection of the contact pieces with the contact carrier made by welding. Here, either the contact carrier is provided with a recess provided, in which the contact piece engages with an approach, or on the circumference of the inein mating parts are raised or depressed to ensure good welding of the two To receive parts. This method is only applicable to those contact pieces that are relatively are thick-walled. In the case of contact pieces made of thin-walled material, good welding can be achieved can be achieved in that the contact piece is provided with conical lugs which come to rest in corresponding grooves of the contact piece carrier. That flows during the welding process Material of the conical lugs in the grooves of the contact piece carrier, so that a good posture will be produced. However, even with this type of fastening, the current transition does not extend over the whole area.

A significantly lower cost of materials and work is created by soldering the contact pieces. But there is the difficulty of the contact piece so to hold at a certain point so that a shift cannot occur during soldering. So far have been specially designed holding devices, gauges and the like are used to avoid shifting, or the edges of the contact piece carrier were bent up, so that a container-like bearing or a trough or pan for the contact piece is created.

However, these known measures have the disadvantage that they once increased material and Cause work and on the other hand an enlargement of the contact piece carrier at the points of the contact pieces, which results in an enlargement of the device receiving the contact piece Has.

The invention now relates to a method for fastening the contact piece of electrical switching devices on its carrier by soldering, according to the invention to enlarge the soldering area and to immovable mounting of the contact piece during the soldering process on its carrier, the contact surface of a part with one or more warts or methods of fastening the

Contact piece of electrical switching devices on its carrier by soldering

Applicant:

Voigt & Haeffner Aktiengesellschaft, Frankfurt / M., Hanauer Landstr. 142-172

Wilhelm Grett, Frankfurt / M., Has been named as the inventor

Ribs and those of the other part is provided with corresponding depressions. During the welding process If the warts or ribs flow away, the warts or ribs remain unchanged during the soldering process. So they are not used to connect the parts, but to fix the contact piece a specific point on the carrier for the soldering process.

This type of definition of the contact pieces has the further advantage that the contact piece with the Can complete the edge of the carrier or protrude on this, which saves space and material and the arc that occurs when switching does not get into a solder joint and the contact piece is melted from its base. Furthermore, a good connection is created in a simple manner the entire surface, since the solder has the opportunity to get around the warts or ribs, especially when soldering to flow around and to emerge unhindered at all edges of the contact piece, so that the Soldering required flux is forced to the outside and disruptive inclusions (cavity formation), the would result in a poor current transfer, are largely avoided.

The pictures serve to explain the invention, namely show

Figure 1 and 2 a contact piece carrier with a contact piece in two views and

Figure 3 is a view of a contact piece carrier from below.

The contact piece carrier 1 is provided at two points with a rib 1 α produced by pressing. In this rib fits the cavity 2 a (Figure 3) of the contact piece 2, so that during the soldering operation the contact piece at the predetermined location genauesteiis

809 600/373

and remains immovable in the correct position during soldering. The solder (hard solder) can, for. B. be rolled onto the underside of the contact piece, while the flux before soldering to the soldering surfaces is applied.

The above-described design of the contact piece carrier and the contact piece can of course also are retained if the soldering takes place in a soldering furnace or directly in the open flame. Furthermore, this design has proven to be particularly advantageous when the soldering is heated by resistance he follows.

Claims (3)

Patent claims: 1. A method for securing the contact piece of electrical switching devices on its carrier by soldering, characterized in that the contact surface of one part with one or the other to enlarge the soldering surface and for the immovable mounting of the contact piece (2) during the soldering process on its carrier (1) several warts or ribs (2a) and that of the other part is provided with corresponding depressions ( 1a) . 2. The method according to claim 1, characterized in that that the warts or ribs and the depressions are made by pressing. 3. The method according to claim 1, characterized in that the soldering by means of resistance heating he follows. Considered publications:
German patent specification No. 670 594. 1 sheet of drawings 1 809 600/373 9.58