DE1210080B - Snap-action switch for economy switching of direct current magnets with switching parts arranged outside the magnet body - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

Number:
File number:
Registration date:
Display day:

HOIh

German: 21g -2/01

L 32831 VIII c / 21g
March 25, 1959
3rd February 1966

The invention relates to a snap switch for the economy circuit of direct current magnets, too whose contact actuation takes advantage of the change in iron saturation that occurs as a result of the iron short-circuit of the armature occurs in the magnet body at the end of the stroke, and its moving parts are all arranged outside the magnet body on one of the outer surfaces of the magnet body.

Previously known embodiments of snap switches in various fields of technology, which is a change in the degree of saturation in the iron of the magnet body as a result of the introduction of an anchor or a short-circuit made use of the anchor when the lift was completed, worked with independent, massive auxiliary anchors in or on the magnet body. These auxiliary anchors were against a spring force of the Armature, when the magnetic pulling force prevailed, pulled into the magnet body and operated directly Switching contacts that canceled the bridging of conventional economy resistors or special holding coils turned on.

Such arrangements, however, did not work completely reliably. So there were often unstable ones States of equilibrium between the spring force pulling the auxiliary armature out of the magnet body tries, and the magnetic force reduced by the economy circuit, whereby the auxiliary armature in Unwanted vibrations occurred, if not special ones, especially during prolonged operation disturbances subordinate mechanical auxiliary and locking devices were provided. On the other hand are the well-known Auxiliary anchor devices either too expensive if the requirements for safe switching and, if applicable, adjustable delay should be taken into account, or they can cannot be easily installed or added to a normal magnet system with working armature.

Arrangements have already become known in the general art that use a snap switch for specific purposes. For example, it is known to assign a snap-action mechanism to a transformer at a special stray field air gap, which continuously chops a direct current in an oscillating manner and thus causes secondary lightning discharges on fluorescent tubes. Such a transformer arrangement must be set up very specifically on the associated switch, as special stray field air gaps identify which determine the position of the switch once and for all. It is also disadvantageous that the switches are relatively complex in accordance with the required switching intervals and are not particularly sensitive to snap-action switches for the economy circuit of
DC magnets with switching parts arranged outside the magnet body

Applicant:

Licentia Patent-Verwaltungs-G. mb H.,
Frankfurt / M., Theodor-Stern-Kai 1

Named as inventor:
Dr.-Ing. Ewald Hering, Berlin

assign ability. From this, too, no reference to the invention can be seen; Task and solution in the known devices are completely alien to the subject matter of the invention ■ opposite.

The identified deficiencies are intended to be avoided by the invention and it is intended to be a special one advantageous embodiment of a snap switch are created, the switching element after Economy switchover is completely safe in the associated switch position and at the earliest when the stroke has ended of the armature, preferably even only after a short adjustable delay time into this Switch position is brought.

This is achieved in that with a snap switch of the type mentioned in accordance with the invention the auxiliary armature of the switch is bent at an obtuse angle at one end and that is bent at this Part of both the point of application of a return spring and the one for a snap spring Acting leaf spring is located, which is used to transmit power from the auxiliary armature to the contact bridge load-bearing, cutting edge-mounted insulating piece is used. At the one facing away from the mentioned spring application points According to a further advantageous embodiment of the invention, this is at the end of the auxiliary anchor supported by a bolt protruding from the magnet body and mounted so that it can be tilted so that the Magnetic body forms the contact surface in a tilted position. Of the tilting movements, the opening or Closing movement of the economy circuit contacts derived. At the same time, the return spring can be attached to this bolt, which is used to support the auxiliary anchor can be attached, and the entire construction is simplified if this bolt is a threaded bolt is, the thread grooves defining the bearing edge of the auxiliary anchor and the retraction

609 503/292

Serve the spring end at the desired distances from the outer surface of the magnet body.

The mode of operation of a switch designed according to the invention will be explained using an exemplary embodiment according to the drawing.

The bearing block is on the magnet body 1 of a direct current magnet, not shown in detail here 2 attached, which carries one (or more) fixed contacts 3 in its upper part. A power supply 4 to this fixed contact has also been indicated. The bearing block! also includes a Notch S in which the cutting edge 6 of the insulating piece 7 rests. The power and motion transfer from that Auxiliary anchor 8 on the insulating piece 7 takes place via the leaf spring 9, the point of application of which is on the insulating piece 7 lies in the central axis 10 of the cutting edge 6. The other end of the leaf spring 9 engages over the pin 11 of the auxiliary anchor 8. The pin 11 also serves to attach the return spring 12, the the other end is attached to a threaded bolt 13 is.

In the arrangement shown, if the magnet body 1 is only slightly saturated, the auxiliary armature 8 under the action of the return spring 12 in the position shown here lifted from the magnet body 1 held and thereby the insulating piece 7 together with the movable contact bridge 14 attached to it (or contact bridges) tilted around the cutting edge 6 until it rests on the fixed contact 3 (or contacts). This bridges an economy resistor, for example.

If the magnetic saturation in the magnetic body 1 exceeds a certain value - that is always the FaU, if the one not shown here The armature has completed its stroke and is on the magnet body 1 - then the auxiliary armature 8 against the force of the return spring 12 attracted by the magnet body 1 and moves around the Bearing edge 13 in the direction of arrow 16 until it rests on the magnetic body 1. During this Pivoting movement of the auxiliary anchor 8 moves the pin 11 downward on an arc of a circle, and if it is below an extension of the central axis 10 of the insulating piece 7, this Insulating piece 7 additionally exerted a torque by the leaf spring acting as a snap spring, as a result it suddenly folds down. As a result, the contact 3 and the contact bridge 14 are separated from each other separated, and the desired economy circuit is established.

If the iron saturation in the magnet body 1 falls below the predetermined value, the auxiliary armature 8 becomes brought back into the position shown in the drawing by the tensile force of the return spring 12 and the economy circuit is canceled.

By changing the position of the point of application of the tension spring 12 on the threaded bolt 13, which can be achieved in a simple manner by letting the bent end 17 of this return spring 12 _r snap into the profile of the threaded bolt 13 at the desired height, the retraction force can the tension spring 12 and thus the saturation value to which the economy switch should respond can be set with sufficient accuracy. One according to the invention

ίο trained snap switch can so thanks to this simple adjustment device for the economy circuit of direct current magnets with different tensile forces be used.

Claims (4)

Patent claims: 1. Snap-action switch for the economy circuit of direct current solenoids, for actuating the contacts the change in iron saturation that occurs as a result of the iron closure of the Magnet armature occurs at the end of the stroke in the magnet body, and all of its moving parts arranged outside the magnet body on one of the outer surfaces of the magnet body are, characterized in that the Auxiliary armature of the switch is bent at an obtuse angle at one end and that is bent at this Part of both the point of application of a return spring (12) and that for a Snap spring acting leaf spring (9) is located, which is used to transmit power from the auxiliary armature to a the cutting edge-mounted insulating piece that carries the contact bridge is used. 2. Switch according to claim 1, characterized in that the auxiliary armature on which the spring application points remote end is supported on a bolt (13) protruding from the magnet body and is tiltably mounted in such a way that the magnet body forms the contact surface in the one tilted position. 3. Switch according to claims 1 and 2, characterized in that on that of the support of the auxiliary anchor bolt serving at the same time the return spring (12) is attached. 4. Switch according to claims 1 to 3, characterized in that the bolt (13) is a Threaded bolt is, the thread grooves defining the bearing edge of the auxiliary anchor and of the return spring end at the desired distances from the outer surface of the magnet body to serve. Considered publications:
German Patent No. 951 404;
Swiss Patent No. 120 091;
U.S. Patent No. 2,170,748. 1 sheet of drawings 609 503/292 1.66 © Bundesdruckerei Berlin