SU68504A1 - Door outflow for mechanical interlocking in high voltage devices - Google Patents

Description

In high voltage electrical installations (in particular, at radio transmitting stations), to ensure the safety of the service, mechanical blocking of the switchgear components is necessary. The most convenient system is the rod. It consists in the fact that the locks at the knife switch, turning off the high voltage, and at the entrance door are controlled by the same key, i.e., similarly to a wand railway lock. An oil switch or a high voltage switch can be turned on only if the lock that locks the oil switch or knife switch is opened. After the lock is unlocked, the key can no longer be removed from it. The same key serves to unlock the door leading to high voltage circuits. From the lock installed on the door, you can remove the key only with the door closed. Thus, before launching the station, the entrance door is first locked, after which the key can be pulled out of it and inserted into the knife switch. By turning the key in the switch of the knife switch, the operator gets the opportunity to turn on the high voltage, but he can no longer pull the door key from the switch of the knife switch and, therefore, cannot open the entrance door. The weak point of such a system is usually the construction of the door lock, because it is quite easy to remove the key from the lock with the door open. In the known locks on the braid of the door, one or more of the pins are fixed, which enter the lock when the door is closed and press it. As a result of pressing these studs, it is possible to turn the key, i.e., lock the doors, after which the key is freely removed. A disadvantage of using simple straight hairpins is that they are easily replaced with various surrogates. As a result, security is compromised.

how the possibility of turning on a high-voltage knife switch when the door is open.

The object of the present invention is the construction of a door lock, which excludes the possibility of removing the key from the lock with the door open.

Structurally, this is achieved by the fact that the rod is made with a movable part that can be rotated on a fixed part so that when the door is closed, the movable part of the rod rotates in the lock and acts on the lever, releasing the lock and lock key.

FIG. 1 shows a general scheme of installing a lock on a door; FIG. 2 is a side view of the lock (cut) with the door open and in FIG. 3 - side view with the door closed.

As mentioned above, the locking rod consists of two parts: fixed / movable 2 connected by a hinge at point 3. Spring 4 causes the movable part to line up with the fixed one, which is obtained when the door is open.

When the door is closed, the rod enters the opening of the lock 72, provided to facilitate entry of the rod with a funnel / 0. The end of the movable part 2 of the rod, reaching the bottom of the 5 hole, begins to slide along the bottom, turning on the hinge 3. When the end of the fixed part / rod reaches the bottom 5, along the;

part 2 will rotate through the largest angle (fig. 3), which may be less than or greater than 90 °. This position will correspond to the complete closure of the door. In this position, the end of the movable part 2 rises up and rotates the lever 6, so that the latter will no longer hold the tab 9 of the lock. The lock can be locked and take out the key.

To open the door, you must insert the key and unlock the lock. When the door is opened, the movable part 2 of the rod is lowered, the lever 6 under the influence of the spring 9 will return to its original position, engaging with the catch of the lock, which has a corresponding cutout.

Subject invention

A door lock for mechanical interlocking in high-voltage devices, provided with a rod fixed on the door braid, which enters the lock and releases the key after unlocking the lock, characterized in that, in order to release the key for its removal, only when movable part that can be rotated on a fixed part so that when the door is closed, the movable part of the rod rotates in the lock and acts on the lever releasing the mechanism apirani lock and key.

FIG. one

FIG. 2

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FIG. 3