DE154490C - - Google Patents

Description

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IMPERIAL

PATENT OFFICE.

CLASS 21 aH 'W ^

The present invention relates to a calling signal for telephone circuits which the call through. Power failure, the final call by power interruption or reversed is effected, and is characterized by the fact that the call sign for the purpose of simultaneous use as a final sign both by the current closure as by the power interruption is triggered, on the other hand if the state of the line remains unchanged, d. H. both when there is no current or when there is continuity.

An embodiment of this call signal can be seen from the accompanying drawing.

Fig. 1 shows a present invention according to built and designed to a flap call sign, its nature and mode of operation are described below.

During the transition of the armature from the rest position to the tightened position, the hook α strikes against the projection c attached to the flap k and in this way causes the flap to fall off. If the flap is now lifted up, the hook a also holds it in the tightened state, in that it also latches in its upper position (i.e. in the tightened position of the armature). If the flap is now de-energized, the anchor falls, and the hook again hits the projection c as it passes, causing the flap to fall again.

2 shows the circuit arrangement of the flap in telephone exchanges in which the automatic call and the final signaling are effected by one and the same character. The call is made by picking up the phone at the subscriber station, as a result of which the current from the central battery flows through the flap of the subscriber station and causes the flap to drop in the manner described above. If the flap is now lifted, the anchor holds it in place even in the tightened state. If the telephone is now hung on the hook after the conversation has ended, the flap is de-energized, the anchor falls off and again hits the projection c when passing, causing the flap to fall again. If desired, the flap can also be used at the same time as a monitoring signal for the called subscriber. The mode of action is then as follows:

If the called subscriber takes his phone off the hook, a current flows from the central battery via its call flap and causes it to drop. The flap is lifted and the participant is connected unknown. While During the conversation, a continuous current flows through the flap and line. After completion During the conversation, the participant hangs on his remote receiver and the line is de-energized again, which causes the flap falls for the second time. The circuits are as follows: When you call (pick up of the telephone from the hook switch) a current flows from the shared exchange

battery b via flap k, line I ₁ , hook switch / 2, via the microphone of the call station, line /, choke coil d and back to the second pole of the battery. The participant is queried by inserting the plug 5 into the latch j and connected to the requested participant by the plug ν. Polarization cells ρ ^ are arranged in the plug cords for the purpose of feeding the participants through their own flaps. In the intercom position, the current from the shared battery b flows once through the flap of the calling subscriber to the same station, the other time through the flap to the station of the called subscriber, and from this the current goes back to the station via the choke coils d.

It is clear that the idea of the invention can be brought into many other embodiments. So z. B. you can bring the flap described above to fall without the projection c. It is sufficient that the hook in the middle position leaves the flap free, whereby the flap is then caused to fall by its own weight or by spring force.

Claims (2)

Patent Claims: 1. Ringing tone for telephone circuits in which the call is through Power failure, the final call from power interruption or vice versa, characterized in that the call sign is for simultaneous use as a final sign both by the power cut and by the power interruption is triggered, on the other hand with unchanged state of the line, d. H. both when there is no current or when there is continuity, 'is recorded. 2. Embodiment according to claim 1, characterized in that the call sign has a drop flap (k) which cooperates with a triggering member (a) connected to the magnet armature in such a way that the triggering of the drop flap when the armature passes from each of the two End positions in the other is effected. For this purpose ι sheet of drawings.