DE1052509B - Electrical switchgear with subdivided contacts - Google Patents

Description

It is known that in electrical Sahaltgeräte with fixed and movable contacts, the movable ones Arrange contacts so that they are in their off position lie in a plane inclined towards the contact-making surfaces of the fixed contacts, when When the contacts are closed, the edges of the movable contacts first hit the fixed contact pieces in order to be parallel to the planes of the fixed contacts during the further closing process, here any oxide layers formed between the contact points are broken through and rubbed away. These The type of self-cleaning is particularly important for contacts made of base metal, but it is with the Disadvantage associated with increased mechanical contact wear. It is also known in the Fixed contacts in the switched-off position arranged in parallel movable. Contact this for the purpose to subdivide better current conduction. Man. has also tried to reduce the mass of the movable contacts and the bruises that occur when the system is switched on thanks to the damping of the spring system to reduce, but without this having succeeded in a satisfactory manner with the known means, were.

For electrical high-voltage switches with pin contacts It is also known to provide a number of fixed contacts with the movable ones Contacts come into contact one after the other and also one after the other when the switch is opened the moving contacts are separated.

It is also known by the shape of the movable Contacts or the contact carrier a rolling motion of the movable. Contacts at her. Impact to achieve the permanent contacts.

The invention relates to an electrical switching device with one of several. Partial contact pieces existing movable contact piece, which in the switched-off position in one to the surface of the fixed. Contact pieces lies at an inclined plane, and is characterized in that the strip-shaped partial contact pieces connected to form a unit come into contact with the fixed counter-contact piece one after the other when the contact is actuated and are also lifted off from it one after the other, the level of the contact-giving parts of the partial contacts as follows is inclined relative to the plane of the contact-making parts of the fixed contacts that when the partial contacts strike the mating contacts, a rolling, tilting or pushing movement is generated by at least some of the partial contacts. The combination of movable contacts subdivided in this way with their inclined position reduces the risk of bouncing when the device is switched on. In addition, the contact bruise can furthermore be reduced or switched off by this means
with subdivided contacts

Applicant:

LICENTIA Patent -Verwaltungs -G.m.b.H., Hamburg 36, Hohe Bleichen 22

Dipl.-Ing. Ernst Deltz, Neumünster,
has been named as the inventor

th that one divides the movable contacts and optionally the fixed contacts Assigns damping body, which expediently consists of porous, elastic foam. By the The moving contacts hit the fixed mating contacts, the partial contacts at least partially produce a tilting, rolling, rotating or pushing movement, becomes a significant reduction the tendency to bounce · reached when switching on. The mechanical wear can be kept small, because it is possible to achieve extensive rolling over one another by using very narrow rails, without the desired self-cleaning of the contacts being impaired.

It is useful for switching devices in which the movable contacts are within an insulating Switching traverse are arranged, the damping body together with their assigned and possibly wholly or partially of these enclosed contact compression springs within a tub-like Arranged holder with which they are pushed together into the recesses in the switching cross member can be.

In the drawing, as an embodiment of a Sdhaltgerätes according to the invention is a schematic Contactor shown. According to Fig. 1, the movable contacts 1 are divided into partial contacts and the fixed Contacts 2 arranged opposite one another that they assume an inclined position to those in the switched-off position. The contacts are in the usual way with assignments. 5 made of contact material. That Switching system consists of the switching coil 4 with the fixed core U and the movable core 3, which the switching traverse 6 with the movable contacts 1, which is made of insulating material, carries. The switching

809 769/419

traverse has trapezoidal recesses 6 '. The contact bridges with the movable contacts 1 rest against the inclined upper edges of these recesses in such a way that they assume an inclined position relative to the fixed contacts 2 in the disconnection control. The trough-shaped holders 9 and 10 are inserted below the contact bridge, which _; those made of porous foam. Damping body together with the contact compression springs 7 included. Fig. 2 shows in partial section the contacts in the switched-off position, while Fig. 3 to 5 show the during the contact closing process of the. Partial contacts 1 can be seen movement performed relative to the fixed contacts 2.

The process of movement is as follows: An edge of the partial contact that hits first. This then lies down straight and establishes full contact. Then the second touches, stands up straight, etc. This way it can be achieved that always at least a partial contact gives contact or that, with a lower number, the times when none of these Partial contacts are on, extremely short. The arc length is thus very short and the Energy that is converted into heat between the contacts is small.

When the leading partial contact hits the entire contact pressure of the spring system on this. So it is due to the relatively small weight of a partial contact and full contact pressure achieved a shock-reducing effect.

Every single partial contact can be made almost as narrow as you want and thus every waelzuing you want can be achieved. The mechanical wear can hereby be kept very small, with the Self-cleaning of the contacts is retained.

When switched on, the entire rail section is available for power supply. During the switch-on process itself, each partial contact is only briefly subjected to high thermal loads. After this the switching process is finished and all rails are full Make contact, the current is distributed to all rails. The contact system is loaded normally.

Claims (4)

Patent claims: t. Electrical switch device with a movable one consisting of several partial contact pieces Contact piece, which in the switched-off position in a to the surface of the fixed contact piece c inclined plane, characterized in that the unit representing, strip-shaped formed partial contact pieces in the contact actuation one after the other on the fixed mating contact piece come to the system and are also successively lifted from this, with the The plane of the contact-making parts of the partial contacts so against the plane of the contact-making parts of the fixed contacts is inclined that when the partial contacts hit the mating contacts through a rolling, tilting or pushing movement is generated at least some of the partial contacts. 2. Switching device according to claim 1, characterized in that all partial contacts of a contact are under the influence of a common contact force (spring 7). 3. Switching device according to claim 1 and 2, characterized in that the under the influence of a Contact pressure spring standing partial contacts is assigned a common damping body (8). 4. Switching device according to claim 1 to 3, characterized in that the movable to each Contact belonging damping body (8) and the contact pressure springs enclosed in this wholly or partially (7) of tub-shaped holders (9, 10) are included, with. which they together can be inserted into recesses of the contact bridge made of insulating material. Considered publications:
U.S. Patent Nos. 1,121,574, 2,059,702;
British Patent Specification No. 511 653 461 090 ·. 1 sheet of drawings © 809 769/419 3.59