DE1901965B2 - SWITCHING CONTACT FOR RELAYS, SWITCHES, KEYS OR THE LIKE. - Google Patents

Description

50

The invention relates to a switching contact for relays, switches, buttons or the like with a spring causing a snap effect, in which at least one contact spring movable by means of an actuator cooperates with fixed Gcgcnkontaklcn and the movable contact spring carries a tiltable contact part in the contact area.

Such switching contacts are known in many forms for relays, hand-operated switches or buttons, the main difference being the actuation gited and its movement. In all cases, however, one or more movable contact springs are controlled via the actuating element in such a way that connections to fixed counter-contacts are canceled and / or established.

The small size of the switching contacts considerable difficulties arise in the contact-making, especially when large currents have to be switched via the switching contacts.

In order to improve the contact, it is already known that the switching contacts with a snap effect to provide effecting spring, the switching of the movable contact springs from the one into the other switch position takes place abruptly. The inadequacy of such switch contacts with a snap characteristic is that, especially with small contact dimensions, there is no sufficient Contact shifting and friction can be achieved more.

To avoid this deficiency there are already switching contacts known with a spring causing a snap effect, in which at least one by means of an actuator movable contact spring cooperates with fixed mating contacts and the Movable contact spring carries a tiltable contact part in the contact area. These Contact formation has the advantage that when switching, a cleaning of the contact surfaces is carried out Movement occurs. This contact movement is small in known switch contacts when the storage of the contact part is made by an integral connection with the movable contact spring. If the contact part is mounted tiltably on the movable contact spring as a separate part, then complicated, mostly multi-part contact springs and additional fasteners are required, and In addition, the assembly of the switch contact is made much more difficult.

It is the object of the invention to design a switching contact of the type mentioned in such a way that only simple parts are required to produce a switch contact that are quick, easy and can be mounted without additional fasteners, without affecting the movement of the contact part for cleaning the switch contact is impaired. According to the invention, this is achieved by that the movable contact spring ends at the end in an approach that has one as a contact bracket Breakthrough formed contact part receives, and that the spring causing the snap effect with a receptacle for this approach of the contact spring the contact bracket on the approach of the movable Contact spring fixes tiltable. The contact bracket is a simple bent and stamped part that only has to the contact spring must be placed and then through the spring causing the snap effect is set at the same time when this spring is plugged onto the contact spring.

The contact rolling movement is then continuous if it is provided that the legs of the Contact clip extend in the direction of the longitudinal axis of the movable contact spring and that the contact clip is curved towards the side of the mating contacts. A contact bruise can be seen with the new one Avoid switching contact by the fact that the contact bracket itself is designed to be resilient.

The contact resistance of the new switch contact can be hooked small that the contact clip on the side of the mating contacts is covered with contact material.

The friction losses between the contact clip and the movable contact spring can be by keeping the front side of the behee small

Contact spring in the bearing area of the contact bracket as Cutting edge is formed.

If a switch contact with a neutral initial switch position is desired, then this is the design made in such a way that when the contact clip is loosely placed and not in contact with any mating contact the tiltable contact bracket in both Tilt end positions does not come into contact with the mating contacts.

The invention is based on an embodiment of a microswitch shown in the drawings explained in more detail. It shows

Fig. 1 in side view of a microswitch, the is designed as a changeover contact and in which the movable contact spring has a contact clip according to of the invention,

F i g. 2 shows an enlarged excerpt from FIG. 1 of the the storage of the contact clip on the movable contact spring can be seen better, and

F i g. 3 a sketch showing the rolling movement of the contact clip on a stationary mating contact illustrated.

In the microswitch according to FIG. I, the movable ones Contact spring 1 and the stationary mating contact springs 2 and 3 of a changeover contact in a contact block 4 cast and fixed. This contact block 4 is according to the use of the switching contact in a relay, switch, button or the like.

The movable contact spring 1 is closed in a known manner by means of an arcuate spring 6 a snap spring added. The spring 6 is, as indicated by the reference numerals 7 and 8, on free end of the movable contact spring 1 and the actuating spring 5 suspended. To this end wear * the spring 6 at its ends corresponding receptacles for approaches of the movable contact spring 1 and the actuating spring 5. The spring 6 presses the contact spring 1 in the starting position against the fixed contact spring 2. The contact bracket 9 is tilted so far that it is with the left Legs on the contact spring 1 and on the other side resiliently on the Koniakt 11 of the contact spring 2.

If the actuating spring 5 is deflected to the left via a correspondingly configured actuating member, a point is finally reached at which the spring spring 6 suddenly switches over the movable contact spring 1. The contact spring 1 is pressed against the stationary contact spring 3 in this position. The contact bracket 9, which is tiltably mounted transversely to the longitudinal axis of the contact springs, tilts until the right leg rests against the contact spring 1. It is easy to see that with these Kippbcwcgungcn the contact bracket 9 an additional rolling movement between the legs of the con tact bracket 9 and the mating contacts 10 and 11 of the fixed contact springs 2 and 3 is created. This rolling process is then continuous when the legs of the contact clip 9 are curved towards the side of the mating contacts.

As the embodiment shown shows, it is not absolutely necessary to use the contact clip Provide contact rivets. In most cases it is sufficient if the legs of the contact clip 9 are covered with a contact material on the sides facing the mating contacts.

If the end face of the movable contact spring 1 has a projection 1 a, then, as shown in FIG. 2 shows that the contact clip 9 is held by the spring 6. The contact clip 9 has a recess 9 a through which the projection 1 α of the contact spring 1 protrudes and which is so large that the contact clip 9 can perform the desired tilting movement. The legs 9 a and 9 b are arched and designed so that the edges 9 c do not come into contact with the contact 10 of the contact spring 3 in the rest position and do not come into contact with the contact II of the contact spring 2 in the working position.

The end-face edges of the movable contact spring 1, which continue from the approach 1 α, are designed as a cutting edge 1 b , so that the contact bracket 9 can tilt slightly.

The protruding from the recess 9 a part of the approach 1 α is inserted into the receptacle of the spring 6 in a known manner. Due to the tension of the spring 6, the contact clip 9 is pressed against the cutting edge 1 b of the movable contact spring 1 and thus clearly held.

On the basis of FIG. 3 should in detail the emergence of the additional friction movement when tilting the Contact bracket are explained. It should be assumed that the movable contact spring 1 with the stationary contact spring 3, not shown, is in connection. The left leg of the contact clip 9 is therefore far from the contact spring 1. The contact 11 of the stationary contact spring 2 is the point 20 on the leg of the contact clip 9 facing. If the actuating spring 5 of such a microswitch is released, then the Switching contact inevitably reset.

The spring 6 ensures that this downshift takes place abruptly. The end of the contact spring 1 describes the circular arc 9, as a result of which a small movement component in the direction of the longitudinal axis of the contact springs arises even in the contact area. This movement component is increased by the tilting process of the contact clip 9. If the contact spring assumes the rest position Γ shown in dashed lines, then the left leg of the contact clip 9 rests against the movable contact spring 1. The contact between the contact 11 of the stationary contact spring 2 and the leg of the contact clip 9 now takes place at point 21. The contact point 20 is marked with 20 'in the rest position of the contact clip 9. During the switching process of the new switch contact, the contact clip rolls from point 20 'to point 21 on contact 11, and sufficient friction movement for contact cleaning can be achieved even with the smallest head contact dimensions and with the simplest contact structure.

1 sheet of drawings

Claims (7)

Patent claims: 1. Switching contact for relays, switches, buttons or the like. With a spring causing a snap effect, in which at least one contact spring movable by means of an actuator cooperates with fixed mating contacts and the movable contact spring carries a tiltably mounted contact part in the contact area, characterized in that the movable contact spring (1) ends at the front in a projection (1 a) which receives a contact part designed as a contact bracket (9) with an opening (9 a), and the spring (6) causing the snap effect with a receptacle for this projection ( la) the contact spring (1) fixes the contact clip (9) on the extension (la) of the movable contact spring (1) in a tiltable manner. 2. Switching contact according to claim 1, characterized in that the legs (9 a, 9 b) of the contact clip (9) extend in the direction of the longitudinal axis of the movable contact spring (1). 3. Switching contact according to claim 1 or 2, characterized in that the contact clip (9) is curved towards the side of the mating contacts (10, 11). 4. Schii'tkonlakt after one of the preceding Claims, characterized in that the contact clip (9) itself is designed to be resilient. 5. Schaltkonlakt na>: h ei iem of the previous one Claims, characterized in that the contact bracket (9) to the side of the mating contact (10, 11) is covered with Konlakt material. 6. Switching contact according to one of the preceding claims, characterized in that the Front side of the movable contact spring (1) in the bearing area of the contact bracket | 9) as a cutting edge is trained. 7. Switching contact according to claim I, characterized in that that when the contact clip is loosely attached and not in contact with any mating contact (9) the design is such that the tiltably mounted contact bracket (9) in does not come into contact with the mating contacts in both tilted end positions.