DE1043458B - Switching device with pivoting contact parts for electrical circuits, especially high amperage - Google Patents

Description

The electrical connection of a tiltable or pivotable electrical device, for example a tiltable electric furnace with a satellite rail system is often carried out on the tiltable part fixed separating knives, the sets of contact springs firmly supported inside the furnace when the furnace is in its operating position intervention. When the furnace is tilted, the cutting blades slide out of the contact spring sets out, whereby the electrical connection is interrupted.

Should such a furnace not only be used as a melting furnace, but optionally be used with adjustable voltage for melting and holding operation or if you want to be able to disconnect the furnace from the busbars in the operating position, this is also the case the arrangement of a known changeover or isolating switch required, which is in the line between the busbar ends and the fixed contact spring sets mentioned, in which the furnace cutting knife intervention.

The placement of these switches makes difficulties, especially in the case of tilting electric ovens, as there is usually only limited space available for this. It also drops at high currents the cost of materials is disadvantageous in terms of weight.

To avoid these disadvantages, a switching device with pivotable contact parts for electrical circuits, in particular high amperage according to the invention to the pivotable Contact parts belonging to mating contacts or some of them on a tiltable structural part, z. B. the furnace platform, a tiltable electric furnace arranged in such a way that both by moving the tiltable Construction part as well as by swiveling out the pivotable contact parts a power interruption he follows.

In the switching device according to the invention, each line run from the furnace to the busbar system only two connection points each between pivotable contact parts and associated mating contacts or between cutting blades and spring contacts, so that apart from a space saving also a material saving in the sense of a cheaper system is achieved.

According to a further embodiment of the invention, which can be arranged on the tiltable structural part Counter contacts be knife-shaped and the pivotable contact parts are spring contacts have, which include the knife-shaped mating contacts in the switched-on position.

However, the pivotable contact parts can also have spring contacts at both ends, which in the switched-on position on the one hand the knife-shaped Ge switching device arranged on the tiltable structural part
with pivoting contact parts

for electrical circuits,
especially high amperage

Applicant:

Brown, Boveri & Cie. Aktiengesellschaft, Mannheim-Käfertal, Boveristr. 22nd

KarlrHeinz Hellmund and Arno Finzi, Dortmund,
have been named as inventors

gene contacts and on the other hand also include knife-shaped fixed contacts. As fixed Knife-shaped contacts can serve as the ends of the power supply or discharge rails.

There are probably switching devices known from two opposing fixed knife-shaped contacts and a conductive pivotable contact part exist, which includes the knife-shaped contacts in the on position and in the off position releases one of the knife-shaped contacts. From these known switching devices differs the inventive device in that the same one and the same contact part for two different Switching operations is used.

Further features and advantages of the invention are explained below on the basis of exemplary embodiments. In FIGS. 1 and 2, 1 denotes a structural part that can be tilted in the direction of arrow 23, e.g. B. a Part of the furnace platform of a tiltable electric furnace, while FIG. 2 represents a fixed structural part.

The switching device, via which the power is supplied to the tiltable structural part or an electric furnace connected to it, consists of the contact parts 7, 8 connected to one another by a copper strip 9 of the insulators 3, while the mating contacts 6 belonging to the contact points 8 are attached to the fixed structural part 2 by means of insulators 4. The contact parts T, 8 are carried by post insulators 10, 11 fastened on a pivotable lever or frame 12. The lever 12 is rotatably mounted at the fixed point 13.

809 67M67

In the selected embodiment, the pivotable contact parts 7, 8 are designed as spring contacts at both ends, of which the knife-shaped mating contacts 5 and 6 are encompassed in the switched-on position. One can of course also make the arrangement so that separating blades are provided as pivotable contact parts and the mating contacts 5 arranged on the tiltable structural part 1 and the stationary mating contacts 6 are designed as spring contacts.

In the exemplary embodiment, the switch is actuated by a rocker arm drive known per se. On the lever 12 train ¹ - and pressure tabs 14 are articulated, on which the shift lever 15 engages. The shift lever is firmly seated on the shift shaft * 5 16, which is mounted in the fixed point 17. The selector shaft is actuated by means of a lever 18 firmly seated on it via a pull or push rod 19 which, in the selected embodiment, is connected to a piston rod 20 of a hydraulic cylinder 21.

In Figs. 1 and 2, the switch-on position is fully drawn out and the switch-off position with dashed lines Lines indicated. In the exemplary embodiment, the spring contacts also remain in the switched-off position 8 in engagement with the knife-shaped contacts 6. This has the advantage that one with a relatively small switching travel and requires little effort to operate the switch. However, if it is undesirable that the contacts of the pivotable contact part also in the disengaged State are conductively connected to one of the knife-shaped contacts and thus under voltage stand, so you can train the pivotable contact part without any particular difficulty so, that in the switched-off position both spring contacts 7 and 8, the corresponding knife-shaped contacts release.

The switching device can also be designed with multiple poles, in which case several adjacent ones pivotable contact parts cooperate with correspondingly arranged mating contacts. Included can the pivotable contact parts in a known manner with a common drive device be connected so that when operated one or more pivotable contact parts in the Switch-on position and the others get into the switch-off position and vice versa. in case of a Such a multi-pole switch, the pivotable contact parts shown in FIGS. 1 and 2 are arranged side by side and actuated by a common selector shaft 16. As can be seen then the shift lever 15 offset so that in the position I of the shift shaft that is arranged according to FIG pivotable contact parts in the switched-on position and those arranged according to FIG. 2 in the switched-off position are located, while in switching position II, the former switched off and the latter switched on are.

You can use the switching device both when it comes to one or more To put consumers at different voltages, as well as when several consumers take turns should be applied to a single voltage. A combination of these uses is also feasible.

3 shows a further example of the application of the invention in a tiltable electric furnace. There it means 22 the furnace in the tilted position with the knife-shaped ones firmly attached to the furnace platform Contacts 5 that cooperate with a switching device according to the invention. Included 1 to 3, the same reference numerals are provided for the same parts.

As can be seen from FIG. 3, the contact parts 5 and 7 are used once for switching on and off of the furnace when it is tilted or moved back to its normal position; on the other hand the oven in the normal position can be operated with the same contact parts by actuating the drive 21 switched on and off or switched over in the manner described above in the case of a multi-pole design will. Thanks to this space-saving arrangement, the switch (s) can be opened directly without difficulty near the furnace e.g. B. mounted under the furnace platform ".

; The invention is not limited to the illustrated embodiments limited. For example, an otherwise known actuation can be electrical, pneumatic Ways or a simple manual operation can be provided.

Claims (3)

, Claims: 1.Switching device with swiveling contact : parts for electrical circuits, in particular x / hofeer current strength, characterized in that the mating contacts (5, 6) belonging to the pivotable contact parts (7, 8) or some of them on a tiltable construction part . ". (!, '22), e.g. the furnace platform of a tiltable Electric furnace, are arranged so that both by moving the tiltable structural part - (I, 22) as well as by pivoting the pivotable - contact parts a power interruption occurs. 2. Switching device according to claim 1, characterized in that the counter-contacts (5) arranged on the tiltable construction part (1, 22) are knife-shaped and the pivoting - "" Baren contact parts have spring contacts (7), which in the switched-on position the knife-shaped - * include mating contacts. 3. Switching device according to claim 2, characterized in that the pivotable contact parts have spring contacts (7, 8) at both ends which, on the one hand, are in the switched-on position : those arranged on the tiltable structural part knife-shaped mating contacts (5) and on the other hand also knife-shaped fixed ones Include Tvontakte (6). .4. Switching device according to one of the preceding claims with several adjacent pivotable contact parts, characterized by a common drive device (14 to 21) such an arrangement that when actuated one or more pivotable contact parts in the on position and the rest in the off position, and vice versa. Considered publications:
German Patent No. 631,645;
Swiss patent specification No. 281 257. 1 sheet of drawings © 809 674/267 11.58,