DE19612995C1 - Mfg. method for HV switchgear contact element - Google Patents

Abstract

A mfg. method for contact point or tip (1), involving several springy mutually parallel and peripherally arranged contact fingers (2), each of which has at least one free end (3), is based on initially mfg. a hollow cylindrical casting body (4), the latter having contact finger bodies (5,6), each of which is rounded off and several of which are interconnected by casting webs (7,80). The webs (7,8) are then removed, by cutting, or machining, at least in the region of the end-faces of the casting body (4).

Description

The invention relates in particular to a contact piece for high-voltage switchgear with several, on one Circumference essentially parallel to each other, resilient contact fingers, each of which is at least one have free end, and what parts of a common form one-piece casting.

Such contact pieces (A. Erk / M. Schmelzle, "Fundamentals of Switchgear technology ", Springer-Verlag, Berlin 1974, pp. 232-237) are used, for example, in high-voltage switchgear for detachable plug contacts, but also as Switch contacts used for disconnectors and circuit breakers. A possible design form of such a contact piece is used for a so-called tulip contact. Such Contacts are made from pieces of copper pipe, for example suitable machining or bending of contact fingers produced. Mostly there are radial slots in the Pieces of pipe sawn to individual, resiliently movable To get contact fingers. The resulting sharp ones Edges of the individual contact fingers are usually through Shielding contact pieces dielectrically shielded, which the Surround and cover the actual contact piece.

The present invention is based on the object versatile and easy to assemble contact piece to create and a process as simple as possible Production of a contact piece.

The object is achieved in that everyone Contact finger by itself, due to the mold in dielek trisch favorable form is rounded and that the contact fin  cast connecting webs at least partially by cutting Editing are removed.

Because such a contact piece does not consist of one Pipe piece but is manufactured as a cast part, Kon tact finger body, which the raw form for the later Kon Taktfinger form a dielectric already in the mold well-rounded exterior shape. This rounded The shape of each contact finger would be by machining work in a later step only very complex to deliver.

Since it is difficult in such a cast body, the fe pouring contact finger individually, is first an im manufactured essentially hollow cylindrical cast body, in which the contact finger bodies together with those connecting them Cast bars form a hollow cylindrical body. The cast webs are then removed by machining, so that only the contact fingers remain. Since this now at the end of the cast body at which the cast webs were removed who are, are no longer connected, they are there resiliently movable.

It would also be conceivable, with the appropriate casting technique, to cast form so that the individual contact fingers without these connecting webs in their final form are castable niche are manufactured. This would make the machining Bear no processing.

The invention also relates to a method for manufacturing position of a contact piece according to the invention, in which a cast body provided contact finger body before Ent Removal of the webs parallel to each other on the circumference of the casting body in the longitudinal direction extending ribs and  in which the casting webs are at least partially machined Editing be removed.

In this case, the molding webs can, for example, by a bring free from radial slots in the casting be tested.

It proves to be particularly advantageous if the ribs are each semicircular in cross section.

This represents a particularly favorable dielectric form of the Ribs and the later curves of the contact fingers Ribs can have their raised, rounded side on the outside have ren outer surface of the cast body.

The invention can also be advantageously configured in this way be that the molding webs between the contact finger bodies by sawing or milling radial slots in the hollow cylindrical castings can be removed.

But it can also be advantageously provided that the casting webs by cutting the protruding body from its in nere outer surface are removed.

The processing in the form of saws or debris can in an automatic processing device the.

In the following, the invention is illustrated by means of an embodiment game described.

The shows

Fig. 1 shows schematically a contact piece which is pushed onto a counter contact and

Fig. 2 in four circular segments 2 A to 2 D cross sections, the position of which is indicated in Fig. 1.

The contact piece 1 is connected by means of a screw connection 9 to a contact piece carrier 10 , which in turn is mechanically and electrically connected to a conductor 11 . In FIG. 1, the contact piece 1 is pushed onto a mating contact 12, so that the resilient contact fingers 2 extends up and radially elastically pressed against the mating contact. The free ends 3 of the contact fingers 2 make electrical contact with the mating contact.

The contact piece 1 is cylindrical symmetrical, but only the parts lying in the sectional plane itself are shown in the figure.

Such a contact piece is simple to manufacture and has inherently such a dielectric form, that it can shield a contact assembly itself and that no further shielding electrodes are required for this.

FIG. 2 shows in the lower left quadrant (A) a top view of the contact piece 1 from the position designated IIA in FIG. 1. In the foreground there are the ra dial inwardly projecting free ends 3 of the contact fingers 2 . The casting webs 7 , 8 are removed in this area.

The upper left quadrant (B) of FIG. 2 shows a section as indicated in FIG. 1 under IIB. A cross section of a straight piece of the contact fingers 2 is shown there. In this area, too, the casting webs 7 , 8 are removed.

The upper right quadrant (C) of Fig. 2 shows a section as indicated in Fig. 1 under IIC in a loading area in which the webs 7 , 8 of the cast body 4 have not been removed ent.

Based on the raw shape of the cast body 4 , which is shown in the right th lower quadrant (D), 4 material has been removed in the remaining areas on the inner wall of the hollow cylindrical Gußkör pers by machining, for example by turning. In this area it can be seen that the contact finger bodies 5 , 6 form ribs on the outside of the contact body 4 .

This area of the cast body, as shown in Fig. 2D, is left essentially unprocessed, it can be smoothed ge only Lich for better electrical contact.

Claims (5)

1. Contact piece ( 1 ), in particular for high-voltage switchgear, lay with a plurality of resilient contact fingers ( 2 ) arranged on a circumference essentially parallel to one another, each of which has at least one free end ( 3 ), and which parts of a common one-piece cast body ( 4 ) form, characterized in that each contact finger (2) caused by itself is completed by the mold in dielectrically favorable shape and that the contact fingers (2) connecting Gußstege (7, 8) are at least partially removed by machining. 2. A method for producing the contact piece according to claim 1, characterized in that provided in a cast body ( 4 ) provided contact finger body ( 5 , 6 ) prior to removal of the cast webs ( 7 , 8 ) parallel to each other on the circumference of the cast body ( 4 ) in its longitudinal direction forming duri fende ribs and that the cast webs ( 7 , 8 ) are at least partially removed by machining. 3. The method according to claim 1, characterized in that the ribs are each semicircular in cross section are. 4. The method according to claim 1 or one of the following, characterized in that the cast webs ( 7 , 8 ) between the contact finger bodies ( 5 , 6 ) by sawing or milling radial slots in the hollow cylindrical cast body ( 4 ) are removed. 5. The method according to any one of claims 1 to 3, characterized in that the cast webs ( 7 , 8 ) are removed by machining the cast body ( 4 ) from its inner lateral surface.