DE1202385B - Contact arrangement with friction damping - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN S / MtWS PATENT OFFICE

EDITORIAL

Int. CL:

H02c

German class: 21c -40/52

number
File number:
Registration date:
Display day:

S 81281 VIIId / 21 c
5th September 1962
October 7, 1965

It is known to reduce contact bouncing due to friction. However, this principle became so far mainly used for contacts for relays, contactors and the like. So it is z. B. with electromagnetic Protect known to connect a movable contact bridge with two brake parts, which when Switching on by corresponding inclined surfaces of a contact bridge holder moved by the actuating armature be compressed under friction against the pressure of a helical spring. The braking system does not take part in the power supply; the entire mass of the braking system is at Shifting moves with it, making it difficult to achieve high acceleration.

The invention relates to a contact arrangement with friction damping by wedge effect, in particular for high-performance switches with a nozzle-shaped extinguishing system. It is that with one fixed contact a slotted, radially resilient, electrically good conductive, inside and outside conical intermediate ring is connected under pretension, which is when switched on after impact of a moving contact piece on its conical inner surface with friction against a likewise conical one Opposite surface of the fixed contact piece moves and when switching off by an axially acting spring moved back into the switch-off position. Since the intermediate ring with the fixed Switching piece is connected, it does not increase the mass of the moving contact piece. An essential one Another advantage of the present contact arrangement is that the intermediate ring when switched on in a radial direction Direction is compressed. This causes an increase in the contact pressure, which in turn increases contributes to the safe activation of even the largest short-circuit currents. In contrast, the well-known Brake system has no influence on the contact pressure.

F i g. 1 and 2 show an example embodiment such a contact system. InFig. 1 is the contact system in the to the left of the center line Switch-on position, shown to the right of the center line at the moment of contact separation, while F i g. 2 shows a section along the line I-I.

In Figs. 1 and 2, 1 denotes the fixed contact, 2 the movable switch pin, 3 denotes the resilient intermediate ring with the slot 4, which is biased against the conically shaped Surface 5 of the fixed contact piece 1 sets. 6 is an approach that the movement of the intermediate ring 3 limited in the switch-on direction, while the ring 7 takes place under the influence of the plate spring 8 Return movement of the intermediate ring 3 limits the contact arrangement with friction damping

Applicant:

Siemens-Schuckertwerke Aktiengesellschaft,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Named as inventor:

Dr.-Ing. Fritz Kesselring, Küsnacht, Zurich;

Dipl.-El.-Techn. Theodor Maurer, Zurich

(Switzerland)

(see right side of Fig. 1). At the moment that Movable contact piece 2 strikes the resilient intermediate ring 3, this is in the direction of the closing movement moves under high friction along the surface 5 against the stationary contact piece 1, whereby bouncing between the movable contact piece 2 and the resilient intermediate ring 3 largely avoided is. When the intermediate ring 3 moves upwards, it is also in the radial direction compressed, the slot 4 being reduced in size. This causes an increase in the contact pressure, which in turn contributes to the safe activation of even the largest short-circuit currents.

When switching off, the resilient intermediate ring 3 moves under the influence of the spring 8 initially together with the movable contact 2 down until the backlash between the ring 7 and the stationary contact piece 1 is passed, whereupon the resilient intermediate ring 3 is shown in the right Position. Tests have shown that such contact arrangements are practically bounce-free work and can be used up to surge currents of 100,000 A and more. By choosing the Bias of the resilient intermediate ring 3 and thus the frictional work, it is possible to such Adapt contact arrangements to the respective requirements.

Claims (1)

Claim: Contact arrangement with friction damping through wedge effect, especially for high-performance switches with nozzle-shaped extinguishing system, characterized in that a slotted, 509 690/349 Radially resilient, electrically good conductive, inside and outside conical intermediate ring (3) under pretension is connected, which is when switching on after hitting a moving contact piece (2) on its conical inner surface with friction against a likewise conical counter surface (5) of the the fixed contact piece and when it is switched off by an axially acting spring (8) moved back to the switch-off position. Documents considered: German Auslegeschrift No. 1123 385. 1 sheet of drawings 509 690/349 9.65 © Bundesdruckerei Berlin