DE29501277U1 - Contact piece - Google Patents

Description

The invention relates to a contact piece which is particularly suitable for use in fuse switch disconnectors.

Contact pieces previously used for busbar adapters have spring locking lugs for locking with plastic pins, whereby the latter can easily break off. Due to this mounting, these contact pieces can only be mounted from the device operating side of the busbar adapter and not from the back. The contact pressure force in such contact pieces is only applied by external springs, and if these break, the required contact pressure is no longer present. In addition, the previous contact pieces are complex to manufacture using punched/bent springs.

The invention is based on the object of creating a contact piece, in particular for fuse switch disconnectors, which can be manufactured with little effort and is easily adaptable in its nature to absorb different contact pressure forces. This is achieved according to the invention with a contact piece which has a one-piece, U-shaped metal bracket with a first and a second leg and a compression spring which is clamped between the legs, the first leg being designed as a fastenable foot, and the elastic compressive strength of the metal bracket and the spring force of the compression spring being coordinated with one another in such a way that contact pressure forces acting on the legs up to a certain size can be absorbed without plastic deformation of the contact piece.

Advantageous further developments of the contact piece can be found in subclaims 2 - 4.

956303

An embodiment of the invention is explained in more detail below with reference to a drawing.

* FIG 1 shows a contact piece according to the invention installed in a fuse switch disconnector,

FIG 2 a connection part of a fuse switch disconnector with towers for receiving contact pieces according to the invention,

FIG 3 shows a contact piece according to the invention in side view, FIG 4 shows a plan view of a punched-out metal part for forming a metal bracket belonging to the contact piece,

FIG 5 is a side view of a connection part of a fuse switch disconnector with openings for receiving contact pieces according to the invention, FIG 6 is a further side view of the connection part according to FIG 5 with slots provided in towers for the contact pieces according to the invention.

0 FIG 1 shows a partial view of a fuse switch disconnector. A housing 1 intended for accommodating fuses (not shown here) can be opened at the front using a pivoting cover and is connected to a connection part 2 at the back. Fuse contacts 3 in the housing 1 are connected to contact pieces 5, 8 in the connection part 2 via electrically conductive connecting rails 4, whereby, due to the three-phase design, three channels 6 are formed in the connection part 2, in each of which a connecting rail 4 is guided (see FIG 2). Each channel 6 is assigned a tower 7, in which a contact piece 5, 8 is inserted.

The contact piece consists of a U-shaped metal bracket 5 and a compression spring 8 as shown in FIG. 3. One leg 9 of the metal bracket 5 is designed as a plug-in foot with longitudinal rails 10 on the outside and with a tab 11 arranged between them, which serves as a connection piece of a plug-on

$5 G 3 O 3 1

The other leg 13 has a projection on each of its long sides and is bent inwards in the front area. The compression spring 8 is clamped between the legs 9, 13 via embossings 15, 16. The tab 11 is provided with an embossing 17 for engagement of a contact connection screw 18 and is slightly bent outwards. The longitudinal rails 10 on the foot 9 are angled on the connection side.

The metal bracket 5 is manufactured in a simple manner by first punching out a correspondingly shaped part from strip material in one piece as shown in FIG. 4 and then bending it into its final shape.

The outer surface of the leg 13 serves as the contact surface for a contact pressure force, the permissible size of which is determined by the bending strength of the metal bracket 5 in conjunction with the spring force of the compression spring 8. By varying the material thickness of the intermediate piece connecting the legs 9, 13 to one another, it is possible to adapt it to the spring force of the compression spring 8 used.

The towers 7 are provided with openings 19 (see FIG. 5), the profile of which is adapted to the contact piece 5, 8 with its longitudinal rails 10 and projections 14 in such a way that the contact piece 5, 8 can be inserted into the tower 7 and is held securely therein. Grooves 20 and 21 according to FIG. 6 are used for this purpose, into which the longitudinal rails 10 and the projections engage. Lead-in bevels 22 on the grooves 20, 21 facilitate the insertion of the contact pieces 5, 8. Adapted recesses 23 are provided for the engagement of the angled ends of the longitudinal rails 10.

Claims (4)

1. Contact piece, in particular for fuse switch disconnectors, which has a one-piece, U-shaped metal bracket (5) with a first (9) and a second leg (13) and a compression spring (8) which is clamped between the legs (9, 13), wherein the first leg is designed as a fastenable foot (9) and where the elastic compressive strength of the metal bracket (5) and the spring force of the compression spring (8) are coordinated with one another in such a way that contact pressure forces acting on the legs (9, 13) can be absorbed up to a certain size without plastic deformation of the contact piece. 2. Contact piece according to claim 1, characterized in that the first leg (9) has a region designed as a guide rail (10) which is suitable for being received in a housing groove (20). 3. Contact piece according to claim 1 or 2, characterized in that the first leg (9) has a tab (11) serving as a connecting piece of a frame terminal. 4. Contact piece according to one of the preceding claims, characterized in that the second leg (13) has an inwardly bent region on the front side, which is provided with projections (14) on its long sides.