DE362261C - Safety device against unauthorized opening of the drives for electrical points and signal boxes - Google Patents

Description

and signal boxes.

The covers of the electrical point and signal drives must be light with a key open so that the drives are conveniently accessible for entertainment. she are therefore not sufficient against unauthorized opening by force or by means of a duplicate key secured, and it is recommended, especially for drives that are of the immediate Supervision by the signalman to are withdrawn, special precautions to be taken automatic reporting of unauthorized opening of the drives, which only occurs when properly Opening can be made ineffective by the signalman. This is achieved according to the invention in that for Switching on an electrical alarm device a contact device when opening of the drive protection box acts automatically, but before the box is opened by a Switching device in the interlocking can turn ineffective.

In order to save special lines between the drives and the alarm device in the signal box, the contact device for the alarm can be switched into the monitoring circuit and the monitoring device for the switches or signals can also be used as an alarm device! will. Then, the opening of the box J Actuators such as the trailing of the switch browser displays i by the movement of the monitoring \ device in the fault location without moving the operating lever j in a known manner for fusing the fuse or operation monitoring acts of Maximalausschalters. As a result, the alarm remains until the signalman is made aware of it. If, however, the attendant moves the operating lever to its central position before opening the drive box, the monitoring device will then only be operated as in the usual changeover. If the contact device is now supported by a resilient pawl when the drive is open in the current-interrupting position, the operating lever can be thrown to switch the drive. When the box is closed, the locking pawl automatically releases the contact lever for alert status again.

In this way, the drive can only be opened with the intervention of the signalman without an alarm and the alert is always automatic when the box is closed manufactured.

In Figs. 5 to 8, an alarm contact a is shown in its mode of operation for a switch circuit with operating current monitoring; The circuit must be supplemented appropriately for closed-circuit monitoring.

In the connecting line between the adjusting battery and the operation switch of the monitoring solenoid is b u and the Maximalausschalter switched χ, which is at greater than operational currents triggered u by the monitoring solenoid, and then, in turn, the monitoring magnet armature in the fault-indicating position to the actuation of a sealed key in known way locks.

The control switch b is connected to the two-field main current motor f _lt f ₂ by the supply lines i- and 2 for seamless back and forth movement of the switch, from which the current-carrying line is switched off after the switch is completed by the drive switches V _x and v _t , as Line 1

by V ₁ in Fig. 5. The monitoring magnet μ excited by the actuating current during the changeover indicates a fault until it returns to the rest position after the actuating current has been switched off. The operating switch b is released from the dotted intermediate position (Fig. 7) for taking up the extended end position, in which the battery-free line, 1 in Fig. 7 and 2 in Fig. 5, is then grounded. In the end positions of the operating switch h , one line is always connected to the battery and the other to earth.

Since the contact α connects the two leads 1 and 2 automatically when the drive protection box is opened, the attendant must be notified beforehand and the operating switch b must be moved to its central position (Fig. 6) so that the short circuit α remains de-energized. If the short circuit α is interrupted again in the drive that is now open; (Fig. 7), the operation switch may be allocated to '■ switching of the switch in its end positions without the opening of the drive makes further noticeable.

If, on the other hand, the drive is opened without the attendant's knowledge, so that the short circuit α occurs at the end position of the operating switch b (Fig. 8 and 5), a very strong I flows

Electricity from the battery through the line! gen r and 2 in the heavily dotted circuit i to earth. The monitoring magnet and accordingly its armature attracts so strongly that the resilient resistance of the j j Maximalausschal- ters χ overcome and the same for switching off <tung of the actuating current is actuated. The armature of the then de-energized magnet u now remains locked in the position indicating the disruption until the attendant is alerted 1 and, after the disruption has been identified, restores the 1 idle state. '

In Figs. 1 to 4, the contact device in the drive for the alarm is schematic I. shown.

The contact lever h is rotatably mounted at 3 and the pawl k at 4 on the fixed part of the drive, protective box and are connected to one another in a resilient manner. When closed-; In a protective box (Fig. 1), the bolt 0 on the removable cover holds the two levers Ii and k apart and the contact α is interrupted. If the protective box is raised to the position of Fig. 4, the pawl k not yet changed its position, but the lever h has already turned to close the contact ο ", the latch r on the lever h is already above the pawl k, which therefore cannot hold the lever h , so that when the cover is completely lifted the position is as in Fig. 2. The two levers can now be spread apart again and the pawl k can be inserted into the detent r to support the lever h, so that the contact α remains interrupted when the drive is open (Fig. 3) .If the cover is put back on, the bolt 0 presses on the shoulder of the pawl k and releases the lever h again, which is activated by the bolt 0, which is simultaneously moved downwards is prevented from contact closing.

Instead of the contact α , the resilient drive contacts V ₁ and V ₂ can be moved into the closed position when the protective box is lifted off, the lines 1 and 2 then being connected via the two field windings J ₁ and f ₂ . Then, however, the two field windings are loaded with the short-circuit current.

Claims (4)

P ATENT claims: 1. Safety device against unauthorized opening of the drives for electrical Turnout and signal interlockings, characterized in that for switching on one electrical alarm device a contact device when opening the drive protection box acts automatically, but made ineffective by a switching device in the signal box before the box is opened can be. 2. Safety device according to claim i, characterized in that for this purpose the monitoring device for the switches or signals is used and the Contact device for the alarm is switched on in the monitoring circuit. 3. Safety device according to claim i, characterized in that the Contact device supported by a resilient pawl in the current-interrupting position when the drive is open can be that when the box closes the contact lever for the alert automatically releases again. 4. Safety device according to claim 2, characterized in that on Place the special contact device the two springy switches for the motor leads, alternately one of which is switched off by the motor in the end positions of the drive when removing of the protective box, so that the two motor leads are then conductively connected via the motor. 1 sheet of drawings.