DE375173C - Electromagnetic fuse - Google Patents

Description

GERMAN EMPIRE

ISSUED
Al May 19, 1923

REICH PATENT OFFICE

PATENT LETTERING

- JHi375173 - CLASS 21c GROUP

'' (P 431io VIIII2i c ³ ) ,

Precision mechanics G.m.b.H. in Krefeld.

Electromagnetic fuse. Patented in the German Empire from November!, 1921.

The subject of the invention forms an electromagnetic fuse in which by the overcurrent excites a magnet and thereby the locking device of a rotary contact is triggered, which interrupts the circuit.

Magnetic fuses of the type mentioned are already known in many types of execution, but which have the disadvantage that

ίο the release device by force External intervention can be inhibited. Another drawback of these fuses is based on the fact that sparks are generated by deliberately pressing the power button can be that charred the housing and make the contact points non-conductive. The natural spark formation is also not prevented in such devices or reduced. There are also already known fuses, with which a violent Closing the circuit in the event of persistent overcurrent is to be prevented by opening the circuit when it is switched on again interrupted by lifting a bridge attached to the switch button at a second point and only then closed when the pressure on the button has subsided. Here, too, can but the movement of the switch button is inhibited by external intervention, so that the displacement of the contactor is not sufficient to move the lower spring contact to solve. The consequence of this will be that the connection at the upper bridge will be inadequate Dimensions is separated, so that a permanent spark arises here, which leads to the destruction of the Fuse housing must lead.

The invention consists in that in order to avoid the abovementioned inconveniences, the power line spring Is fork-shaped and with a prong by way of a stop pin located on the turntable and one independently guided by the turntable on a spring pin to return the turntable serving push button, which is when the circuit is closed by this prong is blocked. The stop pin of the turntable, which is used when the circuit is interrupted up to under the push button, this lifts the guide spring from the turntable, so that one to reduce The contact points are shifted twice to create natural sparking, and on the other hand releases the path of the push button for switching on again. In order to do this by forcefully closing the circuit To make it impossible with persistent overcurrent is the push button with a lug provided, which after returning the turntable to the locking position, the guide spring

keep away from the contact piece until the push button returns to its highest position has reached.

In the drawing, Fig. Ι show a section through the fuse along line AA of Fig. 3,

Fig. 2 a section through the fuse along line BB of Fig. 3, Fig. 3 a plan view of the fuse with the protective cap removed,

Fig. 4 the position of the rotary contact in the switched-off state,

Fig. 5 is a view of the contact spring, Fig. 6 is a section through the rotary contact,

Fig. 7 shows a section through the rotary contact along line CC in Fig. 6.

The fuse housing consists of a base part α and a protective cap b which is cemented onto it in the state of use. A screw cap c is screwed onto the neck of the base part and a fitting screw d is passed through the base itself. An insulated connecting wire e leads from the latter to one coil f and from this a wire g (Fig. 3) leads to the second coil h of the electromagnet. From here, the current is passed through the wire i to the bridge k and then passes via the bearing block I, the bolt to, washer η and bushing 0 to the contact piece / »(Fig. 7), from where it passes through the Connecting spring q is routed to screw cap c.

If the line is short-circuited or if it receives an overcurrent, then the two pole shoes r of the magnet pull on the locking hook t (Fig. 1) attached to a spring 5 , which in this case creates the shoulder u (Fig. 7) of a contact disk mounted on the boltm? ; so that it can snap forward under the influence of a spring w (Figs. 6 and 7) in the direction of the arrow shown in Fig. 1 until the stop pin χ attached to the turntable is resilient against the protruding end y of the pin % stored push button 1 applies. In doing so, the contact piece / »slides away from the connecting spring q and thereby interrupts the circuit, the electromagnet also releasing the locking hook t again. At the same time, however, the spring q is also lifted off the turntable, as the stop pin χ hits the prong 2 of the fork-shaped spring q (Fig. 5) when it springs forward and holds it in the position shown in Fig. 4. The power button 1 is now released; the contact disk can be returned to the blocking position by pressing on it. Here, however, the protruding end y of the power button slides along the locking spring 2 and thereby prevents the connecting spring q from being able to lay against the contact disk, so that the current remains interrupted until the spring 3 pushes the button 1 back to its maximum position Has. Only then can the locking spring 2 slide away under the shoulder y and the spring q connected to it jump against the contact piece /), whereby the circuit is closed again. If at this moment there is still overvoltage in the line, the electromagnet will immediately pull the locking hook i again and interrupt the circuit.

So that the power button 1 can slide past the spring 2 more easily and without wearing out can, it is provided with a rounded metal attachment or a screw 4. In the drawings, all parts made of insulating material are shown in black.

Claims (2)

P ATENT- To sayings: i. Electromagnetic safety device, in which a rotary contact is triggered by overcurrent and the circuit is interrupted by a contact piece on the turntable slipping under a conduction spring, characterized in that the conduction spring (q) is fork-shaped and has a prong (2) in the way a stop pin (x ) located on the turntable (v) and a push button (1) serving to return the turntable are located; this is guided on a spring pin (z) independently of the turntable (v) and is blocked by the one prong (2) of the guide spring (q) when the circuit is closed, while this (q) is blocked by the push button (1 ) The rapid stop pin (x) is lifted off the turntable {v) and the way for the push button is cleared. 2. Embodiment of the fuse according to claim 1, characterized in that the push button (1) has a projection (y) which slides along the fork prong (2) when the rotary contact is returned and thereby the guide spring (q) from the contact piece ( p) keep it away until the pushbutton has reached its highest position again after the turntable (v) has been blocked. 1 sheet of drawings.