DE191021C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 191021 CLASS 21 a. GROUP

Circuit for self-paying call stations. Patented in the German Empire on April 9, 1907.

At self-collecting telephones, in which the initiation of a call is only possible after the insertion of a coin and the collection of the same after termination of the call BEZW. If the return is carried out electronically from the office if the connection has not been established, disturbances often occur in practical operations because

ίο the participants, if the office does not answer immediately after inserting the coin, often put a second coin into the coin channel with the intention of doing this Renew the call to the office and thus become noticeable in a conspicuous manner at the office do; this procedure of the participants usually has the consequence that the two pieces of money in the coin channel respectively. at the point from which the diversion of the coin into the cash register respectively. into the return channel takes place, get stuck and so a proper working of the mechanism for everyone prevent following calls; since such disturbances are only due to occasional revisions the self-collecting call stations respectively. by notification from the telephom'erenden If they become known to the public at the office, they naturally make themselves particularly sensitive valid.

The subject of the present invention is a device in which, on the one hand, immediately after the coin has been inserted, the slot closes automatically until the coin arrives at its final destination (cash register or return channel), so that the aforementioned jamming of coins inside the self-collecting call station cannot occur, and on the other hand, after a breakdown in operation (line interruption, contact, etc.), the slot opening is also blocked and thus a visible sign in the office.

The essence of the device to be described consists in a circuit arrangement in which in the idle state of the self-collecting call station, i.e. during the breaks in the conversation, from the office, a continuous current through the windings of a call relay AR, the speech line, the windings of an opening for the insertion in the current-carrying state Coin-open electromagnet VM, as well as a normally closed contact K on the tongue Z to be moved by the coin flows back to the office and thereby on the one hand suppresses the call signal in the office and keeps the self-collecting intercom ready for operation. As soon as someone directs a coin into the self-collecting call station in order to initiate a call, the call station reaches the movable tongue Z, interrupting the contact K itself while it remains there; the quiescent current, which how

can be seen from the drawing, at the same time a microphone cell happened and this under Charge holds, is interrupted, the call signal appears in the office and the slot opening for the coin is locked.

The circuit before inserting the coin is as follows:

-f- pole of the central battery ZB, Umwindüngen the call relay AR, break contact ι on the isolating relay TR, α-branch of the connection line L, terminal I of the self-collecting call station, branch points 2, 3, microphone cell MZ, branch point 4, windings of the

Locking magnet VM, normally closed contact K on the movable tongue Z, earth, —Pol of the battery ZB.

After the official has accepted the call in the office, the call is established in the usual way; If the conversation cannot take place because the desired subscriber is busy at the time of the call from the self-collecting intercom, the officer temporarily presses the money key GT, sending alternating current into the b-branch of the connection line L , and in this way reimburses the calling subscriber who is still in the speaking position to receive the notification from the office, returns the coin.

Circuit 2.

Windings U of the AC transformer, contact 5 on the cash button GT, ^ -line of the plug AS, contact 8 on the isolating relay (this is in the working position as long as the plug is in place), b- branch of the connection line L to the self-collecting call station, terminal II there itself, contact 9 (the receiver has been taken off the hook), branch point 10, turns U _{1 of} the return electromagnet RM, capacitor. ^, Earth, earth in the office. If, on the other hand, the conversation takes place in the normal way and the subscriber hangs his receiver on the hook, the final signal appears first in the office.

Circuit 3.

-j- Pole of the tail battery SB, windings of the closing relay 5 R , branch point II of the transformer T, windings II of the same, contact 12 on the call and talk button, contact 14 on the money button GT, ^ -line of the interrogation plug AS, contact 8 on Isolating relay TR, b-branch of the connection line L, terminal II of the self-collecting call station, contact 15 on the handset hook (the handset is attached), wrapping of the collecting electromagnet EM, earth, - pole of the terminal battery. The collection electromagnet is not energized sufficiently strongly by this final signal stream.

When the final signal appears, the officer presses the GT money button and only then collects the coin.

Circuit 4.

Windings of the transformer U, contact 5 on the cash button, 6-wire of the plug AS, contact 8 on the isolating relay, b-branch of the connection line L, terminal II on the self-collecting call station, contact 15 on the handset hook, windings of the collecting electromagnet EM, earth.

Claims (1)

Patent claim: Circuit for self-collecting call stations, in which the call to the office is only made possible by inserting a coin, which is electrically collected or returned by the office, characterized in that a continuous current winds the call relay (AR) in the office during the breaks in the conversation as well as the windings of an electromagnet (VM) that keeps the slot open for the coin in the excited state at the intercom station, which permanent or quiescent current is interrupted by inserting a coin and thereby locks the slot until the coin has reached its final destination (cash register or return channel). For this purpose ι sheet of drawings.