DE434745C - Electromagnetic maximum switch, especially for currents with small currents - Google Patents

Description

GERMAN EMPIRE

ISSUED OCTOBER 2, 1926

REICH PATENT OFFICE

PATENT LETTERING

- JKi 434745 CLASS 21c GROUP 68

(P 50483 VIII / 2ic ^s )

Supplement Tmgsb latt
to patent specification 434745 class 21c (group 68 _o

In the patentsucner, the inventor was named: Dr "Hans Ewest in Berlin _e

Patent trust company for electric light bulbs m.b.H. in Berlin.

Electromagnetic maximum off switch, especially for currents with small currents.

Patented in the German Empire on May 14, 1925.

To get involved in electrical circuits! is, as is known, not suitable because it

to protect switched instruments from damage caused by a sudden increase in current, In practice, this is usually done using fuses built into the lines Use. The latter are, however, for currents whose amperage is less than 0.1 amps

are not sensitive enough to changes in such small currents. The instrument to be protected is then more likely to be damaged than the Fuse melts. It has therefore already been proposed that instruments be used for

very low currents are set up, such as milliammers, through an electromagnetic maximum cut-out switch switched on in the power supply protection. However, the maximum disconnectors of this type that have become known so far are more or less not reliable enough, mainly because the Current rise influenced by the electromagnet Shift levers are held by springs that decrease in tension and sensitivity over time. A The disadvantage of this known maximum switch is also that they only open respond to a certain amperage.

The invention now forms an electromagnetic maximum switch, which is below Elimination of the reliability-impairing springs and the simplest design is highly sensitive and at the same time easy for different currents and thus for a large current range can be set. For this purpose the new maximum off switch essentially from a vertical plane in front of an or several electromagnets rotatable gear lever, which is only supported by a contact stop in an approximately vertical position and slightly asymmetrical to the force line field and the central axis of the or the electromagnet is held. The extremely easy to move in this way The contact lever is moved out of the contact position with the slightest increase in current by the action of the electromagnet (s) and drawn even more into the force line field. Since the contact lever here, however already moved slightly to the opposite side beyond its vertical position then it then immediately folds completely downwards through the action of its own weight with permanent interruption of the current. For the purpose of adapting the new maximum cut-out switch to different currents it is only necessary by suitable displacement of the electromagnet (s) or the vertically movable contact lever the size of the one between them To change the gap and thus the effect of the force line field. To one special great sensitivity of the new maximum off switch and also an easier setting To achieve the same, the contact lever is expedient in the gap between two Electromagnets built in, which in their mutual distance approximately by rotation a spindle with right-hand and left-hand thread are adjustable.

The drawing shows an embodiment of one designed according to the invention Maximum switch in Fig. Ι in front view, in Fig. 2 in plan and in Fig. 3 shown in vertical cross section.

On a base plate α , a spindle c is rotatably mounted in bearing block b , but not longitudinally displaceable, which has a left-hand thread d at one end and a right-hand thread e at the other end. On the threaded parts of the spindle c support arms / or g are screwed, which carry electromagnets Ji or i at their upper ends in such a way that they assume a horizontal position and are also axially to one another. The lower ends of the arms / and g run in slots k and I of the base plate a, so that when the spindle c is rotated by means of the cord screw, the arms maintain their vertical position and, depending on the direction of rotation of the spindle, are moved either towards one another or from one another . Exactly in the middle between the two electromagnets Ji and i , a one-armed lever 0 is mounted in a small bearing block η , at the free upper end of which a bow-like arm p is attached. The latter reaches into a mercury-filled bowl q which serves as a contact and which is attached to a rack r. The upwardly mobile arm is ρ by this bracket-like arm 0 is given a low go overweight in direction after the contact bowl q and as long as the flow of normal strength is continuously maintained the contact between this bracket-like arm and the mercury contained q in the cup. The lever 0 supported by the contact q thus usually assumes an approximately vertical position, although it is, even if only slightly, asymmetrical in relation to the field of force lines and to the axes of the electromagnets Ji ₁ i . Both electromagnets and the contact lever 0 are connected in series with the instrument to be secured in the example shown, namely the current flows from the line .r through the electromagnet Ji, the line t, the electromagnet i, the line n, the contact lever 0 and also Bracket arm ρ to the silver cup q and from the clamp <'of the frame bracket r to the; na instrument to be protected. If the current strength increases for any reason, the one-armed lever 0 is drawn into the force line field of the electromagnets by increased or intensified flow of lines of force, with the bow-like arm ρ emerging from the cup q , and accordingly the current supply to the instrument to be protected is immediately interrupted is. Right now where. the upper end of the lever 0 got exactly in the axial direction of the latter by the attraction of the electromagnets

however, the lever ο has already moved in the opposite direction to the initial position beyond its vertical position; it folds then immediately by its own weight down to the dotted line position of Fig. 3. In the downward flaps of the contact lever is arranged 0 by a in its swing plane of the base plate α release highly passing leaf spring w collected in order to avoid damage of the contact lever.

In order to set the operator automatically by the increase of the current strength and the successful interruption of the contact lever having regard, the leaf spring can zv with the contact lever 0 in the circuit of an acoustic or optical signal can be set, which is triggered when a contact of leaf spring and contact lever has occurred.

Depending on whether the gap left between the electromagnets is made more or less large by turning the cord screw m or the electromagnets are more or less approximated to the contact lever 0 entering the gap, the switch can be used for smaller or larger currents. The sensitivity of the switch can also be regulated within wide limits by screwing in or out a weighting screw χ screwed into the upper end of the contact lever 0.

The contact lever 0 does not necessarily have to be in series with the electromagnets. Rather, two separate circuits can also be provided in such a way that the contact lever is in one and the electromagnets are in the other. For example, when using the new switch to protect a transmitter tube, the anode circuit can flow through the electromagnet and the heating circuit through the contact lever. In the event of an impermissible increase in the anode current, the heating circuit is then automatically switched off, thereby protecting the tube from destruction. The electromagnets can also be stored and moved in any other way. If necessary, the contact lever 0 can only be influenced by an electromagnet and instead of being fixedly mounted, it can be designed to be displaceable in the direction of the electromagnet, so that the gap between this and the electromagnet, and thus the attraction of the latter, then changes by moving the contact lever will. Finally, the bearing of the contact lever and its support at the contact point, as well as in the folded-down position, can take place in a different way.

Claims (5)

Patent Claims: 1. Electromagnetic maximum switch, especially for currents with small currents, characterized in that a switch lever (o) swingable in front of one or more electromagnets perpendicular to their axis exclusively by a contact stop (q) in an approximately vertical position and slightly asymmetrical to the force line field and the central axis of the electromagnet or electromagnets is held, so that with the slightest increase in current, the shift lever can be moved out of the contact position by attraction of the electromagnet or electromagnets and can be made to automatically fold down by its own weight. 2. Maximum switch according to claim 1, characterized in that the gap between the electromagnet or electromagnets (Ii or i) and the vertically movable contact lever (o) can be regulated by moving the electromagnet or electromagnets or the switching lever. 3. Maximum switch according to claim 1 and 2, characterized in that the approximately vertical contact lever (0) consists of a one-armed lever rotatably mounted at the lower end, the free upper end of which by means of a bow-like arm (p) in a mercury-filled contact bowl (q) intervenes. 4. Maximum switch according to claim 1 to 3, characterized in that the contact lever Co ) is mounted in the gap between two horizontally and axially arranged electromagnets (h, i) , which in their mutual distance approximately by rotating a spindle (c) to the right - and left-hand threads can be adjusted simultaneously and symmetrically. 5. Maximum switch according to claim 1 to 4, characterized in that a freely upstanding leaf spring (zv) is arranged in the oscillation plane of the contact lever (0) which intercepts the lever (0) folding down from the contact position and optionally an acoustic with this or triggers an optical signal. 1 sheet of drawings.