SU998A1 - Device to selectively call telephones - Google Patents

Description

The proposed device for the selective calling of telephone sets is intended to make a selective call by purely electric means without the use of synchronization mechanisms.

Selective calling is achieved by manipulating with a relay and two batteries, grounded by their opposite poles and located on both ends of a single-wire line, whereby the relay establishes one combination of contacts when grounding the wire and the other when connecting to the ungrounded end of the floor.

FIG. 1 shows a diagram of a device for calling a telephone set from any number of others included in a common line; in fig. Figure 2 shows an adaptation scheme that prevents the other stations from simultaneously calling and eavesdropping.

The principle on the basis of which the proposed device operates is that the selective calling of one or another of the telephone sets included in the common line is carried out by sequentially sending positive and negative currents in a strictly defined order, i.e. first a positive current is sent to the line, and then a negative one, which results in a signal in the telephone set x4, then sending the same two currents, but in the reverse order, will result in a signal already in device B, etc. op as by means of the battery current and by means of the inductor.

The device allows the inclusion in the line of any number of telephones, of which each can optionally call all the others; in addition, an optical signal is provided in the device, automatically indicating: free or busy line; finally, even if one or several stations violated the requirements of the technical instruction or if part of the instruments included in the line were damaged, all other stations can use the device correctly, i.e., call each other as desired.

FIG. Figure 1 shows a diagram of one of the instruments connected in parallel in line with each telephone set, and it must be borne in mind that all instruments have the same device and differ only in the circuit of the internal connection of their individual parts.

The whole device (Fig. 1) consists of the following main parts: 1) four polarized relays (R, R, R, R), 2), so-called. the locking (neutral) relay (R), 3) of the valve device (K) and 4) of the manipulator, consisting of five keys, indicated in drawing No. 1-5. Relay R to R on one side and relay R ,. and R on the other hand are successively interconnected in two pairs, of which the first pair, through the free end of the relay coil R, is included in one wire (ii), and the second pair, through the free end of the relay coil /. in the second wire (2) The free ends of the windings of the relay and R-, are connected to each other and are grounded through a manipulator. Of the four polarized relays just mentioned, each acts only with one direction of current, remaining at rest with the opposite direction of current, namely: the RI relay operates only when a negative current is sent to the LI line, and the R relay is sent to the same line L positive current; relay R is valid only when sending negative current to line Z, and relay R when sending positive current to the same line L. Each of these four relays closes its own working contact (I, II, III, IV) when it is energized, and when the relay is energized and additionally, contacts V and VI are interrupted, respectively. The anchors of the relays R, R ,, (2. j) are connected to an ungrounded pole of a small (2 - 3 cells) battery .S, and the measles 4 is grounded.

It was stated above that the selective calling of one or another telephone apparatus is achieved in the proposed device by sequentially sending currents of different directions in a strictly defined order. Suppose for simplicity that we use a combination of two currents for a selective call in our device: for example,

we can send a positive current first, and then a negative current, or the same currents to the same line L, but in reverse order; or, the same two combinations can be made with a line or into the line L, the current of one direction can be sent first, and the line of the same direction or the reverse, and so on, into the line Z.2, etc. All such combinations when sending a current twice, and hence telephone sets may be twelve, namely:

first package

The second is sending the current. current.

-;

-Y io

-L :,

-i-1

L

- Z- ..

-L :,

+

l g

- .9

L - 1

L

- t-

+ C

+ L, + i.

When considering the twelve current combinations just listed, it is noteworthy that among all the twelve combinations there is not one such that the current of the same direction was sequentially sent to the same wire and that the left column consists of four subgroups with the same names and signs, and the right, on the contrary, consists of the other three, different from the left notation.

Since the useful effect, i.e., the selective call is obtained by sequentially sending two currents, the device has a device that fixes the working effect from the first sending of current, namely the relay (neutral) R. This relay consists of two electromagnets ( g and d), with the ends of the winding g; terminate with clamps A and B, a. The winding of the second electromagnet rj is double: the inner winding is connected at one end to earth, and the second to contact II of relay R, while the external winding of electromagnet i connects at its end to contact II of relay II with the other end. relay R.

The function of the relay is as follows: when a current or one direction is sent to the line, each device excites one of the above four polarized relays, RZ, R-i, and the corresponding working contact of the relay closes; after the lines are turned off from the circuit, the excited relay again comes to a quiescent state. Since the purpose of the Rr relay is to fix the operating effect produced by the first sending of current from the current combination corresponding to this device, the clamp A is connected to the contact I, if the combination of currents of this device starts with -ij; the same terminal A is connected to pin II, if the combination of currents of this device starts with -) contact III, if the combination of currents starts with -L, and to pin IV, if the combination of currents starts with - ((Zj). , when terminal A is connected to one of pins I, II and III, terminal B is grounded, and when terminal A is connected to contact IV, terminal B is connected to the ungrounded pole of the BI battery. Suppose that the first current is sent from a station to a line. There are two cases: the first is when this current sending starts the combination that will cause the alarm bell of our device to start ringing. A current polarized relay will be energized by sending a current and its working contact will be closed, which is connected to terminal A; The closure of the working contact of the excited relay (let it be, for example, contact II) establishes circuit No. 1: battery BI - measles 2 - contact II - clamp A - electromagnet winding d - clip B - ground. As a result, an attachment 9 of the electro magnet r, and the tooth attached to it, will release the electrod magnet measles r, and this measles, under the influence of the spring

12, closes contact VII. This contact, as can be seen from the drawing, remains closed and after the line is disconnected from the circuit, despite the fact that switching off the line entails, of course, opening contact II and, as a further consequence, the interruption of the circuit JMs 1; and since, according to the aforementioned first current sending column, each subgroup of the left column consists of three identical names; therefore, after the first sending of current, in three devices out of twelve, contact VII will be closed.

The second case, when the given sending of current does not correspond to the combination of currents of one or another device. In this case, again, one of the four polarized relays will be excited, but not the one whose working contact is connected to terminal A. Consequently, the above circuit No. 1 is not established, the relay will remain at rest, and contact VII will not close, which the state does not change, of course, even after the line is disconnected from the circuit.

The alarm bell of the device is connected to terminals C and D, and for the correct operation of the bell, the terminal C should be connected to the working contact I, if the combination of currents of this device ends the same terminal C should be connected to terminal II, if the combination of currents of this device ends to contact III , if the combination ends with -Zg and to contact IV, if the combination ends with contact D, it is grounded when terminal C is connected to contacts I, II and III, is connected to the ungrounded pole of the bat In yards, when the clamp is connected to the contact C IV. When sending a secondary current, the call will ring only in one device, since from the above table of 12 combinations it can be seen that, against each subgroup of the left column of three identical names, there are three remaining non-identical names in the right column, which means that, due to the scheme of connecting terminals C and D just described, the sequential sending of current to the line will only affect the device whose connections correspond to the current being sent.

So far, for simplicity, we have assumed that for a selective call, we are using a combination of two consecutive currents, and in this case there are twelve of all the combinations. If we use a combination of three consecutive currents, then such combinations, and hence telephone sets, will already be. In this case, each device will have not one relay -7, but two, since the first relay will record the result from the first current sending, and the second relay /, the j-result from the second current sending, the third sending will already give in one of the devices the final effect. In the same way, with fourfold sending of currents, combi., Nations will be, and fixing relays will require three. In a word, l:, where X is the number of combinations of currents (and hence the number of telephone sets that can be included in the line), and n is the number of consecutively sent currents.

Valve attachment K, designed to automatically indicate whether a line is free or occupied. This device consists of two electromagnets (k and k, and the electromagnet winding is quad, and the electromagnet winding k is double. The ends of the quad coil of electromagnet k- are respectively attached to four working contacts (I, II, III and IV) relays,,, / .. on the one hand, and to earth (ends of two windings) and to contacts V and VI (ends of two other windings) on the other hand. As for the ends of the double winding of the electromagnet 2) then one from the ends of the inner winding is connected to pin II, and the other end to the ground; the ends of the outer winding are connected respectively to the contacts P and VI.

The use of a valve device is as follows: when a current of one direction or another is sent to the Zi or 1-2 3 line of some station, one of the four polarized relays, i.e. RI, R., RZ or R, is energized, and The associated working contact is closed (I, II, III or IV). Since each of these contacts in a closed state, with the help of a corresponding core, is connected, on the one hand, to one of the poles of battery 5, and on the other hand, the same contact is connected to one of the ends of one of the four electromagnet windings Aj, the second end of which is connected directly or indirectly (via the contact V or VI) to the other pole of the same battery B, then at any sending of current to the line, one of the four windings of the electromagnet 1 develops a magnetic field and attracts measles f. As a consequence, the prong 6 connected to the bark j releases measles /. and the last one, pada, pushes the corresponding plate out of the window, the appearance of which serves as an indication that the line is occupied. In this state, the valve K remains after the current in one of the windings that developed the magnetic field disappears, i.e. after switching off the line from the circuit, the further consequence of which is the interruption of the corresponding working contact I, II, III or IV . It also does not affect the position of the valve and the subsequent sending of current to one of the linear wires, since in order to return the measles j to the rest position indicated in FIG. 1, it is necessary for this measles to be pulled by means of an electro-magnet / c, i.e. the entire device must be brought to rest, indicated in FIG. 1, and not only the valve K, but also the latching relay Y is meant. This return of the entire device to the quiescent state is achieved by simultaneously (rather than sequentially) sending a positive current to both wires of the LI and Z line, resulting in LI and L ,. the relay will energize. and, moreover, contacts II and IV are closed and contacts V and V are interrupted. Thanks to the contact I, a circuit .№ 2 is installed (battery 2, contact P - internal winding of the electromagnet kf, - ground) and

circuit No. 3 (battery j - measles 2 - contact II - internal winding of the electromagnet g - earth), as a result of this premise, both in valve K and in relay U.-, the lock is respectively cor 7 and so on. That is, the one and the other will come to a state of rest, which state will not change even after the line is turned off, since the aforementioned measles will be held by the teeth b and / o, respectively.

The essence of the operation and the valve K and the relay 7. reduces to the fact that the Leustan of one of its electromagnets, namely 1 or G, they are brought to the working position, and the action of the other of their electromagnet (kv or go) are both resting position Therefore, the electromagnets of each pair are antagonists with respect to each other. Meanwhile, the same pins II and IV serve, on the one hand, for connecting the electromagnet / g and TI windings into the battery B circuit, and on the other hand, the same contacts II and IV also serve and windings of electromagnets k- and go. Therefore, two precautionary measures must be taken: the first is to ensure that when the electromagnet k or i is operating, the windings of the respective electromagnet antagonists k-i or r-i do not develop a magnetic field. This is achieved by the fact that the windings of the electromagnets k and g are double, and when the contact II or IV is closed, the current from the battery sees in each pair of windings in the opposite direction. The second precautionary measure is inverse, i.e. it is that when the k-2 and y electric magnet are in operation, the magnetic field of the electromagnets 1 and g do not develop. This is achieved due to the interruption of the contacts V and VI, which, in their the turn entails, firstly, the switching off of the corresponding windings of the electromagnets k and g, and, secondly, the turning off of one of the two windings of the electromagnets / s and g ,,. As a result, the electromagnets k and i do not work, and the electromagnets Xv and g precisely have the opportunity to work by turning off one of their two windings.

The device keypad consists of five keys (1–5), with the AWs 1–4 keys used to selectively call telephones, while the No. 5 key has as its purpose to bring the entire device to any MOMeFiT and from any station to the rest position. Each key consists of two metal parts.

6 .... /) from each other

(.... l

isolated (shaded part), and in a state of rest, thanks to the springs IJ. .. 1J, contact surfaces with a key .... intimately in contact with their contacts A and VIII, XI, XIV, XVII, XX. At the same time, each metal part a ... .a of the left key is connected by a conductor to the corresponding contact of the upper key, except for the metal part a of key No. 5, which is grounded, and contact VIII of key No. 1, which is connected to the windings of the relay R and R. In this way, the grounding of the windings of these relays takes place through a manipulator, as mentioned above. As for the metal parts of all the keys b ... .1, they are connected via the already mentioned springs ij- / 7 to the clamps E, F, G, H, I, which are linear clamps (two for the wire Zj and is .), except for the clamp / connected to the positive pole of the battery 2. In addition, each of the MAS 1-4 keys has two contacts each (IX and X for the keys No. 1, XII and ХП1 for ЛЬ 2, etc. .), which are closed when you press a key with your finger, and key number 5 has three such contacts (XXI, XXII, XXIII). In keys 1 - 4, these contacts are connected respectively to the poles of the battery Bz (ungrounded) and in key No. 5, contact XXI is connected to the negative pole of battery B, and contacts XXII and XXIII are connected respectively to wires L and L. The operation of the manipulator is as follows : when you press any key (for example, key number 3), the corresponding contact first interrupts (in our example, contact XIV), for which the connection of the relay and 3 to the ground is interrupted, i.e. the device of the calling station is turned off, and t m warns unnecessary branching of current into the device of the calling station. The next moment, contacts XV and XVI (or corresponding to them when you press the other keys) are closed, due to which one of the poles of the battery V. ,, is grounded and connected to one of the wires of the Zi or LZ line the other pole of the same battery (when you press, for example, the L-3 key, the positive pole of the Bz battery is grounded, and the negative pole of the same battery is connected to the Z-jV wire. In other words, each key allows you to send positive and negative current leads. Key number 5, which performs the same function as all the others, differs only in that it serves to send a positive current to both wires at once, i.e. it replaces simultaneous operation with key numbers 1 and 2. To easily and it is convenient to use the manipulator, it is necessary to have a table with each device containing, on the one hand, the name or number of all stations connected by a common line, and on the other hand, each key should indicate the combination with which this station can be called. An example table for twelve stations is shown below: Station number. .№ k.pavishy. After calling the desired station, the conversation between the connected telephone sets takes place in the usual way, with the polarized relays connected in parallel, RZ, R, S affecting the weakening of the conversation, since they have a large self-induction response. At the end of the conversation, the key number 5 is pressed, the whole device is brought to the rest position. This key can be used not only by the caller or the called station, but also by all the others, which is important in the case when someone from the forgetfulness talker has moved away from the telephone unit and has not brought the entire device to a state of rest. The whole device can function both by means of battery current and by means of an inductor. In the latter case, an ordinary telephone inductor is used, modified so that it can give a constant current. Such an inductor should be included in the device according to the same scheme as the battery Bz (Fig. 1), which would then be superfluous. On the contrary, battery B remains, both with one method and with the other, but with a Bz battery, a small part of the latter, in the form of two or three cells, can function as a battery B. To automatically indicate the moment of occupation and release of the line, the device is entered optical signaling device, which, moreover, automatically warns of the possibility of simultaneous sending of currents from two stations, guaranteeing the correct functioning of the device, and, secondly, during the conversation of two stations, all the others are deprived of the possibility and eavesdrop (diagram of Fig. 2). A polarized electromagnet (A) designed according to the Whitston system and characterized in that without current the measles can be installed with one or another stop screw (not shown), where it is held by the action of the nearest pole signal extensions. Passing through the windings of the current of one or another direction, you can force the measles to be installed either on one hard screw or on another. The anchor of the electromagnet K war (/ / and 6), with each other being measles isolated, and each

they are in a quiet state, i.e., when there is no current in the windings, they close the corresponding contact (VIII and IX). The winding of an electric magnet is K-turn, and its ends are connected: 1- winding (from outside to inside) is one end to contact V, the other to contact IV. 2- winding - to contact II and VI. 3- winding - to contact I and VI. 4- winding to pins III and VI. 5- winding-to contact II and IV.

The operation of the electromagnet K is as follows: when sending from any station to one of the wires of the current line of a positive or negative direction, one of the 4 polarized relays (/ ,, R, R or 4) 1 is excited Contact I, II, III and IV respectively closes. Due to this, through one of the 4 windings of the electromagnet K (except the innermost one, through which the current from the battery B passes only when the relay is simultaneously energized and R passes the current from the battery B and, moreover, in such a direction that J-6 measles will move away from that hard the screw for which it is supposed to be mounted on the drawing (i.e., with contacts VIII I and IX closed), and is installed on the other stop screw (circuit when energized, for example, relay R,;. 2-contact II- 2- electromagnet winding K-contact VI- measles 4-negative the battery key {luce of battery B). The movement of the box j J- - 6 will result in that the plate C connected to it will appear in the window O (occupied), I but even earlier, already at the initial moment of movement of the box / - 6 from i of one stop screw to another,; contacts VIII j and IX will break. As can be seen from the drawing in Fig. 2, measles 6 with contact VIII closed; connects the positive pole of the inductor (G) with all keys the torus, and measles /, when the contact IX is closed, connects the lever of the telephone I device on one side and the secondary: winding induction coil on the other hand. Consequently, the break I of contact VIII prevents the possibility of sending currents to the line, and

The jerk of contact 1X prevents the possibility of eavesdropping.

The restoration of the initial position shown in the drawing, i.e., the return of the core to its first stop screw, comes from pressing the L5 key, which leads to the disappearance of the plate C ("free") and the restoration of the contacts VIII and IX. Pressing the key L 5 and rotating the inductor knob (G}, a current with a sign is simultaneously sent to both wires of the line. This entails the excitation of the relay R. and R, which, in turn, has the consequence of closing the contacts IV. Thanks to these contacts, the current will go from battery B through the 5th winding of the electromagnet K and, moreover, in the direction that will cause the measles / - 6 to return to its original position (circuit: B - pin 3-pin II- 5- winding Magnet K-Contact IV-measles 4-battery J5).

It should be borne in mind that the simultaneous passage of current through one of the 4 first windings of the electric magn. And on the one hand, and through the 5th winding of the same el-magn. - on the other hand (such a current passage, as directed in a mutually opposite direction, would paralyze the movement of the core / - 5 from one stop screw to another) is warned due to the interruption of contacts V and Vl, which occurs when the relay D. is energized and 4 Above, it was indicated that Break contacts VIII and IX entails, firstly, the impossibility of sending currents in line, and secondly, makes it impossible to eavesdrop. Consequently, if the station making the call for some reason does not receive a call, then all the other stations will be completely cut off, and since in the railway business, for which the device is mainly intended, there is just the opposite task, i.e. interrupt the speakers and call the desired station, in view of all these circumstances, the device has an L 6 button, on the one hand, and measles / - b tl contacts VIII and IX are attached to four terminals (N, L, R, O) on the other hand.

The function of button 6 is that when it is pressed, the current from battery B is directed to the 5-yio winding of electromagnet K. Thanks to this, when you press button 6, the measles / - 6 moves to its original position, and the station is able to send currents in line (i.e. call) and eavesdrop. Such buttons can, if desired, provide all the devices or only some of them. On the other hand, the above-mentioned clips (L, TVj, P, Q) make it possible to leave the devices, either deprived of buttons No. 6, the order of either an inductor or a conversational circuit, i.e., one or the other. To do this, you only need to connect the iV and O clamps with a slat, and then even when the contact VIII is interrupted, the inductor or the No. 1 and P clamps are not lost, and then even when the contact IX is interrupted, the opportunity to speak and listen is not lost.

Regarding the improvements in the design of the latching relay R -. ,, this latter also represents a polarized electromagnet designed according to the Bitston system, with all the features of this system described above for an electromagnet K. The winding of the R is double, the ends of the outer winding are connected to terminals A B and the ends of the inner winding are connected to pins II and IV. Clips C and D are connected respectively to the jerk and bell (sound), and contact VII with one of the ends of the bell winding. The connection scheme of clips A, B, C, D with contacts I, II, III, IV, V and VI is given in the description above. The operation of the relay is as follows: when a current is sent to the line, starting a combination of this unit, one of the relays, / ,, R or R will be energized with a contact connected to terminal A. Due to this, the current from battery B will pass through the external winding of relay R - in the direction that will cause measles 7 to move away from its original position and close the contact Vll. This contact will remain closed after the current from the calling station has been sent. The call will act as described above. The reduction of the relay R to its original position occurs through the internal winding of the relay / connected in parallel with the 5th winding of the el. - magn. K, i.e., simultaneously and on the same grounds with this electromagnet. Thus, the return of the relay R to its initial position occurs every time when operating with key No. 5 at any station (except this one) or when the NO 6 button is pressed at its station, if the latter is equipped with such a button.

Features in the design of the telephone set shown in FIG. 1, in comparison with conventional telephone sets, are as follows: the bell (battery) and the inductor (G) are completely turned off from the line, and the inductor gives a direct current, and its poles, if necessary, are connected to the line wires by one or the other key manipulator. The microphone and talker circuit are set when the handset is lifted. The microphone battery (B) serves simultaneously for the operation of the electromagnetic. / C, relay R- and call. The RI, R., and Ever relays remain on line, however, these parallel relays to the telephones will not affect the weakening of the conversation, as they have a large self-induction response. In addition, the use of an optical signal (warning of simultaneous sending of currents from two stations and the impossibility of eavesdropping) does not necessarily require redesigning valve K. Both of these changes can be entered into valve K, not changing its overall design, if only some parts in the core 7 are changed shown in FIG. 3, where valve K is left unchanged, in general, but only measles Y, when valve K is at rest, closes two isolated contacts VlII and IX from each other. When a current flows through one of the windings of the electromagnet k, the measles 7 will disappear, then the contacts VIII and IX are open. With the passage of the current through one of the windings of the electr. K measles 7 convergence, and these contacts are open again. These contacts, as well as the N, NI, P, Q terminals, correspond to the same contacts and terminals (Fig. 1) of the present description, and therefore their functions are the same. The function of button N ° 6 is identical, which, however, is structurally different. When you press this button, from the battery B is a positive current in the internal winding of the electric magn. k, with simultaneous shutdown of the external winding of the el-magn. k and the 2nd winding el.-magn. j. Thanks to this, only el-magn works. kz, and valve K returns to its original position. The latching relay R must always be of the same type as the valve. Investigator1; but, in the case where the valve is constructed as shown in FIG. 3 of the present description, the relay R-y should be constructed as shown in FIG. one.

SUBJECT OF THE PATENT.

1. A device for selectively calling telephones connected to a common line, characterized by cumulative use in each telephone set: a) four polarized relays Ri, Rz, RS and R, of which relays R and R respond to sending a single direction to the current line , and relay 2 and Rt respond to sending a current in the opposite direction, and relay RI with. R and relays R and Ri are connected to each other in series with the intention that only one relay would act when sending current to the line; b) a relay that closes the Sv ring or R relay with contact VII when sending to the line a group of current pulses assigned to this device, which relay 5 is equipped with two electromagnets g and y, of which the electromagnet g is intended to bring the relay into operating position, and the electromagnet G2- to bring the relay to the rest position, and the electromagnet rg is equipped with two windings acting against each other, the circuit of one of which.

as well as the winding circuit, is opened by contacts VI and V when the relay is brought to a quiescent state; c) a solenoid valve A, the flap of which falls off when sent to the current line, which valve has, firstly, a KI electromagnet equipped with four windings, which serves to bring the valve to a tilted position and, secondly, equipped with two windings of one electromagnet acting one against the other X ,,,, intended to bring the valve to its normal position, and when the valve returns to its normal position, the circuit of one of these windings, as well as the circuit of the winding KI, is turned off, due to an open circuit, by contacts VI and V; d) equipped with five keys No. 1, No. 2, No. 3, No. 4, No. 5 of the manipulator, of which: keys No. 1, N ° 2, jY ° 3, No. 4 serve for selective calling, and key No. 5 for bringing the whole device to the quiescent position, which keys are turned on in such a way that when you press each of them, the device of the calling station first turns off (one of contacts VIII, XI, XIV, XVII, XX opens) and then one of the battery terminals is grounded. or inductor, and one of the wires of the line is connected to the ungrounded pole of the battery or inductor (a pair of terminals IX and X or XII and X is closed 1P, etc.), the key N ° 0 is provided with an additional contact XXIII and when pressed, both wires ij and io of the line are connected simultaneously with the positive pole of the battery or inductor.

2. In the device described in clause 1, a device to prevent other stations from simultaneously calling and eavesdropping on a conversation between two of them, characterized in that the valve X closes the measles of the VIII and IX in the normal state, which are interrupted when current passes through the winding of the electromagnet K, to close these contacts and bring the valve to the initial position, the telephone set can be equipped with button No. 6.

3. Variations of the device described in paragraph 2, characterized in that instead of button No. 6 the telephone set is equipped with N, NI, P, Q clamps in order to connect the N to P clamps with each other when the contact N is connected to IX, remained connected to the line, if the contacts L and Q were connected between themselves, the inductor, with contact VIII open, would remain included in the line (Figs. 2 and 1).

4. The modification of the device described in paragraph 2, which differs, firstly, in the fact that the relay is equipped with a Bitston type electromagnet with two windings, of which external, is intended (when current passes through it from the battery B) to close contact VII, connected to terminals A and B, internally, connected to pins II and IV (keys No. 5 or No. 6), i.e. connected in parallel with the fifth winding of electromagnet K, is intended to bring the relay /, -, by pressing key No. 5 or No. 6

to the quiescent state (contact VII is opened), and, secondly, by the fact that the valve electromagnet K is provided with: a) a double bark, 6, 7d consisting of two parts isolated from each other, which measles in the quiescent position closes the contact VIII and IX, when current passes through the windings of the electromagnet K, it interrupts the contacts VI11 and IX, and also triggers a signal about the occupation of the line; b) five windings, of which four windings are connected to contacts I, II, III, IV, V, VI, so that when the relay RI is energized, 3 h 4, the current from the local battery B passes through one of these windings and transforms measles / - 6 - 7 into the working position, and the fifth winding is connected to the contacts II and IV, as a result, with the simultaneous passage of current through the relay and R, the current from battery B passes through this fifth winding, and contacts V and VI open which returns measles / - 6 - 7 to rest.

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