DE1027253B - Prevents contact bouncing when flat relays pick up - Google Patents

Description

GERMAN

The invention relates to the prevention of contact bounce »when electromagnetic is attracted Relays of the type dier flat relays, as used in telecommunications systems, especially in telephone systems Use come.

In the case of flat relays with an armature arranged parallel to the core, the bouncing of the has a relative effect An anchor with a large mass is particularly troublesome for proper contact. When falling of the relay on the one hand there is a risk that the rebounding armature, which is caused by special devices is caught, due to its large mass and the deflection of these devices the contacts actuated again briefly:

However, it is already known to prevent this undesired contact actuation in that the The armature is influenced by a return spring, through which it experiences a force pushing it away from the core, and that at the same time the armature travel is designed ao that the armature only after when the relay is activated Covering a free stroke can act on the contact springs, so when the relay drops in none a firm connection to them.

In addition to the undesired contact actuations that occur when the relay drops out, such on the other hand, also with his suit with high anchor speed due to the hard hitting of the anchor to the core. This is especially the case when one or more Contact spring systems are initially held in a very specific position, and the closing the contacts are then made by the intrinsic forces of the spring layers under tension, which are caused by the actuator or parts thereof, e.g. B. by attached to the anchor bracket when tightening of the anchor. The fixed spring layers are usually directly or via the front bobbin flange supported against the core. If the armature hits the core at high speed when the relay is tightened, the fixed spring layers with a rigid connection to the core due to the initial acceleration imparted to the core taken away. When the initial acceleration is greater than the self-acceleration the springs released to make contact when the armature is tightened can be closed As a result, working contacts are briefly opened again, d. H. the relay bounces.

The invention prevents these bouncing phenomena occurring when the anchor is tightened in that the stationary contact spring layers are elastically supported against the core or against the front coil flange are.

Preventing contact bounce
when picking up flat relays

Applicant:
Siemens Sd Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Korbinian Karrer, Munich,
has been named as the inventor

The invention is explained in more detail using an exemplary embodiment.

Fig. 1 shows partially in section a side view of a relay according to the invention, from deim in

Fig. 2 is a section along the line BC and in

Fig. 3 is a front view partially shown.

The anchor bearing is designed according to FIG. 1 so that the arcuate part of the armature 2 with the aid of a leaf spring screwed against the core 1 3 is pressed against the core 1. From this leaf spring 3 a section is cut out and offset from the center of the screw connection bent towards the rear part of the armature. The leaf spring 3 exercises. on the. Armature 2 thus exerts a force whose point of application is already slightly tightened Anchor behind the axis of rotation which moves with the rolling of the armature 2 on the core 1 and which works against its direction of tightening.

As shown in FIGS. 1 and 3, the waste path of the armature 2 is limited by a bracket 4 screwed onto it. The retaining screws are also used to hold the partition. The bracket 4 is held so strong that it cannot under any circumstances spring through when the armature 2 falls off. The actuating element 5 for the contact springs 8, 9, which is held by special Hailte springs 10, is completely separated from the armature 2 and only comes into a force-locking connection with this when it has overcome the free stroke when it is tightened and hits the stops A. These measures prevent in a known manner that the armature can still exert an influence on the contact springs after falling. When switching off the

709 958/161

The armature 2 experiences excitation from the under tension standing contact spring ^ 9, the retaining spring 10 a force for the actuating element 5 and the leaf spring 3 which separates it from the core 1. He falls so far until the stop of the bracket 4 against the core. 1 hits. By, the rigid execution of this The bracket and the force exerted by the armature retaining spring 3 will initially cause the armature to spring back largely prevented as a result of deflection. These two. But measures are not enough to achieve that To prevent rebounding completely. For this reason, the anchor has the one already described above Free lift and thereby the possibility of commuting within this free lift, and it comes completely to rest without disturbing the contact ga.be.

In Fig. 2, the support of the fixed contact spring layer is shown. The contact springs 8 are embedded in an insulating material part 11, which is brought into connection with the core via support bridges 6 that sit on two Ausladearmen.7. The extension arms are designed in such a way that they deflect when the armature hits the core hard, and prevent the initial acceleration imparted to the core from being transferred to the spring layer. The contact spring layer thus receives * a lower initial acceleration than the core itself, and closed normally open contacts remain closed even at the highest final armature speed.

Claims (1)

PATENT CLAIM: Prevention of contact bouncing when telecommunication relays pick up, especially telephone relays with an armature arranged parallel to the core and a set of contact springs made up of movable and fixed contact springs, its fixed Contact spring layers are supported against the core or against the front coil flange, characterized in that the stationary contact spring layers are elastically supported. Considered publications:
German Patent No. 438 791;
Belgian patent specification No. 499 871:
British Patent No. 510'16O ¹ ;
U.S. Patent No. 2,174,592. 1 sheet of drawings © 709968/161 3.58