DE194666C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS'21 β. GROUP. 59.

Patented in the German Empire from November!, 1906.

The invention relates to such a circuit arrangement in which a certain of any number of telephones connected to one and the same line a call is made directly by the office, first of all by a series of power surges from the office Contact pointer is set on a contact disc, which by this setting with

ίο the one for the alarm clock of the intercom to be called leading extension lines is connected, and second here a current arises, which on the one hand sets the alarm clock of the called station to sound brings, on the other hand, the resetting of the mentioned contact pointer to its original Situation immediately after calling, caused by the interruption of the electricity. The purpose of the invention is now, in such a telephone exchange arrangement without further automatic »both with a local battery system and with a central battery system for each participant without any use the telephone line to achieve the following effect:

a) the deactivation of all other connected extensions as soon as a subscriber picks up his receiver,

b) the reactivation of all positions that have been switched off simply. as a result of hanging the remote receiver on the part of the subscriber,

c) the activation of a second extension on the same line for Purpose of communicating with another same line by calling them second position from the office.

The invention consists in that when the telephone is picked up on an extension unit, a changeover relay located in an electromagnetic switchgear is switched into the current of a local or office battery. By energizing this changeover relay, a circuit is created ^: one of the latter, independent local battery, via the armature of the same changeover relay, one of the same closed contact, the pointer of the electromagnetic switching mechanism, the auxiliary unit lines connected to the pointer in its rest position, all the alarm clocks and overturning electromagnets every extension and earth closed.

This current, which, only temporarily through said contact or during the tipping over of the armature of the changeover relay is present and which all Overturning electromagnet flows through, causing the locking of all other extensions. When the changeover relay is de-energized, its armature causes the connection

This makes the alarm clock g sound

established with a second contact through which a current from the opposite direction of the first mentioned current is closed. The disconnection of power when the receiver is re-attached now causes the locking on all extensions to be lifted. The desired extension, which by the an. call from the office was also locked on the part of the first extension, the call from the office causes the trunk to branch L ^{2 of} the common line L ¹ , 1? concluded that the incoming call from the office at the same time causes the re-tipping of the armature α to the overturning electromagnet u of the desired extension in a manner known per se. In Fig. Ι the circuit is shown when using a local battery and in Fig. 2 with a central battery. The electromagnet E is excited by the current of the office battery AB, it being noted that the electromagnet E is such that it does not respond to speech currents.

brought that when the electromagnet E responds a little longer, a grounded local current is closed in the automatic switching mechanism, which in a manner not shown here via the pointer Z, the contact piece c, the desired extension, the alarm clock g of an electromagnet u, the earth and the local battery flows in such a direction that the armature a of the overturning electromagnet comes into contact with a contact / on the desired extension. The pointer Z jumps after its setting and after the cessation of the alarm call back to its rest position characterized in that said local current g by the longer response of E not only c and Bell, but also flows to a local electromagnet that during ringing or . During the response of E prepares the uncoupling of the pointer Z and after the stop of the ringing or the response of E, the uncoupling completes, whereupon the pointer Z follows a spring force, jumps back into the starting position and, also following a second spring force, is again uncoupled. However, these processes, which are known per se, are of subordinate importance in the present case. The main purpose of this is to show how the stations not participating in the call can be switched off and then back on again by picking up and hanging up the receiver.

Next to the contact disk D (Fig. I) there is a changeover relay R. If this responds, its armature $ touches a resilient center piece m; however, when the armature s springs back into the rest position, it comes into contact with a metal surface η which is isolated from m . The metal surfaces m, η, which are separated from one another, are each connected to one pole of a local battery VB , the middle part of which is grounded.

The extension lines I ¹ , / ² , / ³ etc. lead to the alarm clocks g of the various extension units.I, II, III each to a polarized overturning magnet u and then to earth. The extension lines are also separated from each other in the contact disk D only when the pointer Z is in the working position, ie rests on one of the contacts c ', c ", c'".

In the rest position of the pointer Z , however, all extension lines Z ¹ , / ² , Z ^{3 are connected} by means of the contact pieces t, t to the pointer Z , which is also in metallic connection with the armature s. If now z. If, for example, the remote receiver at point II, which is to call or is called, is lifted, a contact is formed at ρ through the receiver hook h and a circuit earth-i? B - Rwh -p-earth is closed.

The relay R, which is surrounded by current, attracts its armature s and makes contact with the metallic spring m . If the remote receiver is hung up again, the contact at ρ is interrupted again, the relay R is de-energized, the armature s falls back and touches the metal spring n when the armature s temporarily touches the metal spring m a current is closed from the battery VB , which takes its way back to earth via to, s, Z, all contact pieces t, including extension lines /, the alarm clock g and relays u of all extensions. The consequence of this is that the armature α of all relays u with the exception of the calling point tip over (the bells g do not respond because of the weakness of the current) and thus, on the one hand, disconnect the telephones at contact f from the line L ' ² , on the other hand, under grab the lever h , so that the latter even when lifting the receiver atj? can no longer establish contact, i.e. the connection is excluded and at the same time a closing signal is visible, which indicates that the line is busy. On the calling extension II can namely. Armature a does not tip over because it prevents the receiver hook h from tipping over mechanically in the manner indicated at subscriber station II, so that here at contact f there is no disconnection from the branch line L ² and

hence the remote receiver is connected to the line L ¹ , L ² via the contacts b, f, the receiver hook h and the anchor α .

If, on the other hand, the armature s makes the temporary contact at η on the way back after hanging up the telephone receiver, then, because the current is now in the opposite direction, the armature α of the relays u tip over in the opposite direction, so that

ίο the connection on contact f. with the line Z, ^{2 is} re-established and the lever h is free again.

In those cases where z. B. the subscriber II another subscriber lying on the same line, z. B. III, would like to call and speak, the case would arise that when the subscriber II calls or when he lifts his receiver, the device of the subscriber III to be called is blocked according to the processes just described and disconnected from the line Z, ² would be separated at contact f , so that conducting a conversation would not be possible for him.

In order to cancel this blocking again, the ringing current sent by the office at the desired point III has the effect that the ■ overturned armature α , separated from contact f , is returned to its rest position, thus also releasing the lever h and the connection with f again manufactures. In the present case, the call from the office only causes the called station III to be released again, so that it can conduct a conversation with the calling subscriber II. By picking up the handset on an extension, a current is sent to the office via the handset hook h grounded by contact ρ , the contact b and the line L ¹ , which causes the call sign, not shown, to respond. So it does not matter whether it is one of the three possible cases that

1. A subscriber calls the exchange to connect outside of his group to have; "

2. A subscriber calls the trunk to connect to a subscriber of his own Group to have or

3. A subscriber is called from the office, it follows from the above arrangement

a) the automatic shutdown of all non-active extensions only by picking up the receiver at the called or calling subscriber,

b) the later reconnection of an extension on the same line when they are called by the Office and

c) the reactivation of all extensions when the receiver is hung up again on the subscriber station that was in the conversation.

The previous representations apply to a circuit with local battery operation. At a Switching with central battery operation, the switching operations are much simpler, as shown in FIG. 2 can be seen.

At the office, outside the central battery CB, the current of which the electromagnet E cannot excite, there is a second battery AB for calling by the subscribers and for telephone traffic. In addition, an electromagnet e is also provided at the office, which indicates the presence of the current from the battery CB as a result of lifting the receiver on any extension.

The performance of this magnet is twofold: firstly, it indicates the call to the office, and secondly, it disconnects the earth from one pole of battery AB and connects the same pole to branch IA, the latter being done by the armature of magnet e when it responds, it moves from the contact piece \ to the contact piece r.

A similar device is located at the switchover plant D. Like the magnet e at the office, is the magnet R in the branch L? switched on. The electromagnet E here has the same task as the one (E) in FIG. 1, namely to rotate the switching mechanism D. The overturning of the armature s of the electromagnet R has the task of switching on the current of the local battery VB , as well as the task of switching off the electromagnet E from the earthed contact piece k and connecting it to the contact piece w, which leads to the line L " , loo

As can be seen, the battery RB and the special line vl of FIG. 1 are omitted here. Picking up the receiver on any extension has the consequence that the relay R and the electromagnet e in the office are powered by the power central battery CjB, line L ¹ , branch point x, contact b, receiver hook h, contact f, branch point y, line L ² , Relay R, electromagnet e and CB come into action, with the same effect with respect to relay R as in the above-described arrangement of FIG. 1.

The circuit shown in Fig. 2 enables:

i. calling an extension from the office. by means of the key q and the excitation of the electromagnet E also in the event that Z. ^{1 is separated} from L ² , because only in this case both the battery AB through the contacts e, \ and the electromagnet E through the contacts s, k is grounded,

2. the calling of an extension by the excitation of the electromagnet E also on the part of the office also in the event that the branches L ¹ , L ^{2 are} connected as a result of lifting the receiver on any extension, because then both the one pole of the battery AB over the contacts e, r as well as one end of the winding of the electromagnet E are connected to the line L ^% via the contacts s, w , and ■ .. ■.

3. The lifting of the grounding both at the office and at the switchgear D during telephone traffic.

It is now easy to see which switching operations at. the. Device according to FIG. 2 occur in the three cases mentioned. For example, if the exchange wants to call any extension, the q button is simply depressed two, three or more times depending on the number of the extension desired. As a result, the electromagnet E responds just as often, whereby both the battery AB and the electromagnet E are grounded. The called subscriber then picks up the receiver; as a result, the earth is switched off by the armature tipping over in both the electromagnet e and the relay R.

If, on the other hand, any extension wants to call the exchange, it has nothing more to do but also pick up the receiver, whereby the earth at \ and k is switched off at the same time as the call.

But if the case occurs that a subscriber on the common line L ¹ , L ' ² wants to speak to a second subscriber on the same line, the first extension calls

: As already said, first call the exchange, and this will now call the second desired subscriber by pressing the q key, no longer using the grounding, but using the double line, as already explained. When the conversation is over, the normal position is restored by simply hanging up the telephone.

Claims (1)

Patent claim: Circuit for telephone extensions with central or local battery operation, in which, as soon as a subscriber depends on his' receiver, by means of a toggle electromagnet assigned to each extension, the latter with. Contacts of a switching mechanism common to all extensions are connected, all other extensions are switched off, in which circuit the same is switched on again when a previously switched off position is called by the office and in which all other participants by hanging on the receiver from a participant who has just been in the conversation be switched on again, characterized in that when the receiver is picked up on an extension (I, II or III) in the idle state of the electromagnetic switching mechanism (D) , a changeover relay (R) located there is excited by means of the current of a local or office battery (RB or CB) a Strömkreis one of the latter independent local battery (VB) via the armature (s) of the change-over relay, a .geschlossenen of the same contact (m), the pointer (Z) of the electromagnetic switching mechanism, which all with the pointer in its Connected extension control ungen (I ¹ , Γ ² , I ³ ) all alarm clocks (g) and overturning electromagnets (u) and the earth is closed, which causes the locking of all other extensions, which are unlocked by the fact that when the switch relay (R) is de-energized As a result of hanging the receiver on the extension, the armature (s) of the changeover relay establishes a connection with a second contact (s) through which a current is generated in the opposite direction of the last-mentioned current, while the unlocking of a certain second extension (e.g. B. III) is carried out by a current that is closed in a known manner via the contact (c ² ) connected to the desired extension (II) of the electrical switchgear, which has meanwhile been set by the office The overturning electromagnet is reconnected to the common line (L ¹ , L ² ) in a likewise known manner. . 1 sheet of drawings.