DE1697353U - KNIFE CONTACT FOR ELECTRIC SWITCHES. - Google Patents

Description

PATENT ADVOCATE

DIPL.-ING.AMTHÖR

FRANKFURT AM MAIN

FKANKFUET A.M., 17 'Dec.'

NESENSTRASSE β

τϊιϊβο »52637

Rudolf Bogenschütz GmbH., Elektrotechn.Spzfbrk * Frankfur t / Main ~ Hö chs t.

"Blade contact for electrical switches"

The invention relates to a blade contact for electrical Switches that work in particular with high currents.

It is known that the forces for operating the switch or for pulling the knife are very great in switches of this type, so that, depending on the size of the switch, operation by manual forces alone is very difficult. Attempts have been made, this disadvantage by arranging leverages ^to: eliminate; however, this results in very cumbersome constructions. Even the suggestion of using multiple contacts, each of which has only a low current load and therefore only a low contact pressure, does not bring any significant improvement, since the sum of the individual contact pressures in turn requires a great deal of force to pull the switch blade .

The arrangement according to the invention makes it possible to achieve even the largest dimensions with knife contacts without additional Aids and manual operation without difficulty perform; At the same time, the necessary contact pressures for power transmission can be applied. In accordance with the invention takes place during the switching movement on at least one part

the shift path a rolling friction takes place. This can in particular can be achieved through the use of rolling elements between at least one knife surface and a mating surface are arranged »Here, the rigid or resilient Mating surfaces including the rolling elements must be live, on the other hand, it is also sufficient to only make the rolling elements current-carrying and these through movable lines, Strands or the like. to be connected directly to the connection terminals.

In a special embodiment of the invention, provision can also be made for the contact pressure to be dependent on the switching movement make, i.e. this, for example, from the moment of entry " Shifting to increase to the end position, so that the operation not only through the rolling friction but also due to the contact pressure, which changes during the contact movement is made much easier. Either the distance between the knife surface and the rigid or resilient counter- Reduce the surface in the direction of the switch-on movement or use non-circular or oval rolling elements.

The possibility of movement of the rolling bodies is expediently limited by stops, and the bodies themselves can be loaded by an I-spring in the direction of such a stop. This ensures that the rolling elements remain in the suitable opening position and, when the knife is switched on, roll on inclined smile with increasing pressure. Instead of a straight incline of the surface in order to achieve an increasing contact pressure, any curve adapted to the respective requirements can be used, according to which the distances decrease in the switch-on direction.

In order to also use profiled switch blades, you can provide or install rolling elements whose axes are not parallel to each other and so at least one the body always gives a sufficient contact pressure.

Except for a "use of the innovation on any electrical This can also be used, in particular, for so-called low-voltage high-performance fuses that use Have blade contacts, are used »

In the drawing, three exemplary embodiments are shown « represents and indeed show;

Fig. 1 is a perspective view of a knife

contacts ge mass invention, i'ig, 2 another embodiment of a blade contact

in the same way of representation, üig. 5 a further embodiment, with only rolling friction occurs on one side of the knife.

The one in! Pig. 1 shown consists of the movable contact on and off switchable knife that is pushed between the two resilient contacts 2 and 3. Between Knife surfaces and the surfaces of contacts 2 and 3, which are inclined towards the knife in the switch-on direction, so that the distances between the knife surface and the contact surfaces in If the switch-on direction decreases, the rolling elements in the form of cylindrical rollers 4 and 5 are switched on. When switching of the knife roll the rolling elements between the surfaces and increase due to the 'narrowing of the lower area Contact pressure until its full height in the "setting" is reached.

Either the contact pieces 2 and 3 are live or only the rolling elements 4 and 5 alone, in we praise. em EaIl these are in direct contact with the terminal in a conductive manner through a stranded wire 6. The braid can be attached to the Be welded to rolling elements. As in the drawing can be seen further, the contacts can be so curved, that guides 8 are formed at the same time. At the end of ~ management example in Fig. 2 are the distances between the surfaces of the knife 1 and the contact pieces 2 'and 3 * the same, while the rolling elements 9 and 10 to increase the Contact pressure when switching on the knife than in the cross section oval rollers are formed. In the example of the Pig. 3 there is only rolling friction between the one measuring surface of the knife and the surface of the contact piece 11, while the other surface of the knife slides on the contact piece 12 when it is switched on. The cylindrical roller 13 is in this case supported by a spring 14.

The invention is not limited to those described and drawn exemplary embodiments, but includes them all measuring contacts or contacts acting as such those between the switching elements during the switching movement wholly or partially rolling friction takes place.

Claims (10)

64759352 * 21125 -5 -. ■■■■. : S- c util a aspr ü - c η e: 1. Blade contact for electrical switches, marked by a training such that when switching between the switch blade and at least one opposing surface completely or partially rolling heating takes place. 2. Blade contact according to claim 1, characterized in that between the switch blade and at least one Opposite surface rolling elements are arranged, which if necessary. are live. 5 blade contact according to claim 2, characterized in that that the counter surface interacting with the rolling elements and the corresponding surface of the switch blade are inclined to one another in such a way that the distance between the I "lache η decreases in switching direction. 4. blade contact according to claim 2, characterized by non-round or oval rolling elements. 5. Blade contact according to one or more of the preceding Claims, characterized in that the mating surface is rigid or resilient or resiliently supported. 6 · Blade contact according to one or more of the "previous ones Claims, characterized in that the rolling elements and the corresponding mating surfaces are live. 7 » Blade contact according to one or more of the existing claims _} characterized in that the rolling elements are directly conductive with the connection terminals, ζ .B * by moving lines, welded strands or the like. -are connected. 8 * Blade contact according to one or more of the previous ones Claims, characterized by the arrangement of stops to limit the movement of the rolling elements. 9. blade contact according to claim 8, characterized [characterized that the stops are resilient or supported. 10. Blade contact according to one or more of the preceding Claims, wherein the rolling friction is brought about by roller-shaped bodies, characterized in that the axles the bodies are inclined to each other.