DE1020711B - Double-pole, six-position switch for regulating the heating output of three heating resistors connected in series in a heating plate - Google Patents

Description

GERMAN

The invention relates to a double-pole disconnecting six-stage switch for regulating the Heating output of three heating resistors connected in series in a heating plate, those on four adjacent ones Terminals of the switch are connected, with the free end of one in the Series of external resistance to the first terminal and the free end of the other in the series external resistor is connected to the third terminal, which has two contact points, while the junction between, the first resistor and the middle to the fourth terminal and the junction between the last resistor and the middle one to the second Terminal is connected.

The three series connected resistors of the heater are in six stages as follows switched: first stage all three resistors in parallel, second stage two of the same in parallel, third stage the stronger of the two latter alone, fourth stage the weaker of these two alone, fifth stage the latter two in series and sixth stage all direi resistors in series.

The necessary connections between the resistance ends and the poles of the network are made switches adapted to the requirements of these six step circuits are produced.

The current state of the art knows various six-stage switching devices for heaters, i. H. various six-stage circuits, with their appropriately designed switches, the facilities all make up a more or less irretrievable number of contacts or have contact arms. Six-stage switches are known, the contacts of which are all in one Level are arranged around a rotating roller when switching. For other switches, the in Contact pairs lying on a plane are axially controlled by a common cam disk. To achieve smaller switch dimensions is one in one as well as in the other construction Contact pair (contact arm with associated mating contact) removed from the common plane and in a: second level, where they are operated by separate actuating elements.

Draw such contact arrangements Switches due to small dimensions, so stick to them in conjunction with their corresponding Six-stage, - circuits a technical deficiency in the fact that at least when switching from one level to another, a contact is disconnected from a mains pole and is directly connected to the other, which can lead to a short circuit when switching quickly.

Double-pole, six-position switch for regulating the heating output
of three in a hot plate in series
connected heating resistors

Applicant:

Busch-Jaeger Dürener Metallwerke
Aktiengesellschaft, Lüdenscheid

Karl Schön, Lüdenscheid,
has been named as the inventor

A known solution for preventing this evil consists in generating an air stream in the switch during the switching process ¹ , which, directed at the corresponding contacts, blows away the arc immediately after they are opened. This switch so constructed is very expensive to manufacture.

Another known solution is that too Contacts prone to short-circuits by rotating insulating washers provided with recesses in this way to interrupt that the insulating washers immediately after opening the respective contacts between this push and so the emergence of arcing impede.

To reduce the tendency · to short-circuits in rapid To eliminate switching, according to the invention, between the contacts of the first and the second Heating conductor connection terminal arranged a connection contact in the form of a contact pair, which only then exists when all three resistors are connected in parallel and the one in the other switching positions is interrupted.

In addition, the five contacts connected to the heating conductor connection terminals are assigned contacts, of which the first, third and fifth are connected to one mains connection terminal and the second and fourth to the other mains connection terminal ¹ .

Another feature of the invention consists in the fact that the existing between the first and ^one second Heizleiteranschlußklemme contact connection by means disposed on the camshaft of the switch insulator disk in the switching stages: is separated 4, 3, 2 and 1 and in the off position.

709 809 / 26Φ

In Fig ¹ . 1 to 7 the switching arrangement of the switch is shown schematically in (fen individual heating stages and in the off position;

Fig. 8 shows a section through the switch at the location between contacts 1 and 2 Hillkontaktes, and

Fig. 9 is a side view of the same.

As shown in Figs. 1 to 7, the three resistors A ₁ B, C are firmly connected one behind the other. They are connected to the four terminals 1, 2, 3, 4, of which terminal 3 has two contact points. Between the terminals 1 and 2 there is a contact connection consisting of the two contact springs 11 and 12. On the camshaft 13 (Fig. 8), on which the individual cam disks 14 for controlling the contact springs 15 are seated, there is a disk 16 (Fig 8 and 9), which occurs between the two contacts 11 and 12 when the switch is not in the level of the highest switching capacity, ie when all three resistors A, B, C are connected in parallel.

In the switching position according to Fig. 2, the two contacts 1 and 2 are connected to one another. As can be seen from the same, the three resistors A, B, C are all connected in parallel to the mains terminals Pi and P 2.

In the second switching position according to Fig. 3, the disk 16 is located between the two contacts 11 and 12, that is, both terminals 1 and 2 are now separated. Fig. 3 shows that the two resistors B and C are connected in parallel to the mains terminals P 1, P 2 here.

According to Fig. 4 is also the. Disk 16 between the two contacts 11 and 12. The diagram shows the connection in the third switching stage, in which only the resistor C is switched on.

In Fig ¹ . 5 is the resistance in the fourth switching stage! B switched on.

In Fig. 6, in which the disk 16 also separates the contacts 11 and 12, the resistor B and the resistor C are connected in series to the network, and in Fig. 7 in the sixth switching stage, all three resistors are in series with connected to the network.

Claims (2)

PATENT CLAIMS: 1. Double-pole disconnecting six-stage switch for regulating the heating power of three heating resistors connected in series in a heating plate, which are connected to four adjacent terminals of the switch, the free end of one of the external resistors in the series to the first terminal and the free end The end of the other resistor located outside the series is connected to the third terminal, which has two contact points, while the connection point between the first resistor and the middle one is connected to the fourth terminal and the connection point between the last resistor and the middle one is connected to the second terminal is, characterized in that between the contacts of the first and second heating conductor connection terminal (1, 2) there is a connection contact in the form of a pair of coiit clocks (11, 12) which only exists when these three resistors (A, B, C) are connected in parallel and is interrupted in the other switching positions, with the the contacts associated with the five heating conductor connection terminals, the first, third and fifth are connected to one pole connection terminal (Pl) and the second and fourth are connected to the other pole connection terminal (P 2). 2. Switch according to claim 1, characterized in that that the contact connection present between the first and second heating conductor connection terminal through an insulating washer arranged on the camshaft of the switch into the Switching stages 5, 4, 3, 2, 1 and in the switch-off position is separated. 1 sheet of drawings © 709 80 * 264 12.