DE174945C - - Google Patents

Description

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IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JVl 174945 CLASS 21 α. GROUP

Addendum to patent 171953 of March 14, 1905.

Patented in the German Empire on June 30, 1905. Longest duration: March 13, 1920.

The direct final signaling from the extension, as it is effected according to the patent 171953 by means of the two relays h and k , can also be achieved by using a drop flap with two positions, in such a way that when the armature is tightened the rest flap the flap held in a certain position and only completely when the anchor falls off

ίο is released to take its end position. In this end position, the flap acts on current connection pieces in such a way that the desired final signal condition is produced will.

This arrangement is illustrated, for example, in the drawing.

As soon as the extension subscriber IV picks up his receiver when the connection is established, the circuit for the battery

ao terie e closed. The anchor of the flap q located in the house control center III is tightened and releases drop flap 0 for a moment, but locks it again immediately after it has fallen a certain distance

S5 is. As soon as the extension subscriber hangs up his receiver after the call is over, the anchor of the flap q drops again and now releases the drop flap ο completely. Depending on whether the final sign g ^{1 is given} in office I by a power interruption or a short circuit, the flap 0 opens or closes the two current connection pieces χy in the end position and thereby gives the office the final signal. In the example shown, the call flap r is switched to bridge to the exchange line η j> and in this way the office is given the closing signal.

Due to the action of the flap q , as in the main patent 171953 by the relays h and k, premature termination is avoided.

Claims (1)

Patent claim: Circuit for automatic final signaling in switching cabinets according to patent 171953, characterized in that, for the purpose of avoiding premature final signaling in the office (I), the two relays (hk) in the main patent are replaced by a flap (q) with two positions, which acts in a known way in such a way that the first time when picking up the receiver on the extension (IV) due release of the drop flap (ο) the same can only happen a certain amount and is only fully released when the handset is hung up on the extension after the call has ended and the flap is thereby de-energized, in which latter case the postal line (np) over from the drop flap Closed current connection pieces (xy) for which the final character (g ^l r) in the office and on the house control center (III) is released. For this purpose ι sheet of drawings.