US1387171A - Telephone-exchange system - Google Patents

Description

LJPOLINKOWSKY. TELEPHONE EXCHANGE SYSTEM APPLICATION FILED FEB. 20, 19191 1,387,171,, PatentedAug. 9,1921.

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UNITED STATES LIPA POLINKOWSKY, on NEW YORK, N Y., AssIGNoR ro'wnsrnnixi nnnornrcgco PANY, mooarolmrnn, on NEW YORK, 7N. vY n conronerron or NEW YOB, I

TELEPHONE-EXCHANGE SYSTEM. 1;

Patented 9,;1921.

Application filed February 20, 1919. Serial No. 278,178.

T 0 all whom itfmag concern:

Be it known that I, LIPA POLINKOWSKY, a citizen of Russia, residing atrNew York, in the county of New York and State of New York, have invented certain new and useful Improvements in Telephone-Exchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone systems in which connections between subscribers lines are extended in part by means of automatic switching apparatus and in part by the use of operators link circuits.

More particularly, it has to do with a telephone system of this character wherein subscribers lines are arranged to be extended by automatic switches over connecting circuits leading to operators positions in a manual exchange, where the calls appear in answering jacks before the operator.

The object of the invention is to arrange for message registration by providing the subscribers lines, as for example the subscribers lines of an automatic satellite, with message registers located at the satellite, the operation of which is controlled by the operator in the exchange such that successful calls are charged to the calling line, whereas calls which do not succeed are not registered.

A feature of the invention consists in providing means associated with the finder switches in the satellite, and controlled by the operator at the exchange in such a manner that during the release of the satellite apparatus, at the end of a call, the register of the calling line is operated or not, depending upon whether or not the operator manipulated her charging device to register the call.

A further feature consists in the arrangement of a metering circuit containing a relatively high potential source, together with means under the control of theoperator as soon as a connection has been established for preparingthe meteringlcircuit, so that during release of the satellite apparatus, such circuit will be completed and the high potential source applied to the calling line to actuate the message register thereon.

Such other features as are contemplated by the present invention will readily become apparent from a consideration of the following description.

In the drawings, "which disclose tele-v phone system embodying thefeatures of this invention, Figure lishows a subscribers line terminating in the satellite in the multiple contactsof first line finder switches. Fig. 2 shows one. of a plurality; of; second line .finderswitches in the satellite arranged to extend connections over-trunk circuits leading from the satellite to a manual exchange, where they appear in. the answering jacks at an operators position together with the answering. end of an operators card circuit. associated with the connecting circuit of the second line finder controlled by afmanually operated device at the operators. position for eitecting the operation of message reg.- isters associated with the callinglines, and further, a subscribers line'local tothe exchange appearing in a jack before theoperator. I

It is believed that a clearer-understanding This figure also shows means may be had of the inventionfromra description of the operation of the system in which the same is embodied. It will be assumed that a subscriber in the satellite, such as the subscriber atsubstation 274, desires to obtain a-telephone connection with a 'subscribers; line in the manual exchange. By removing his receiver from the hook, a circuit is established from battery through, the left-hand winding of line relay 201, contact and outer armatureiof cutoff relay 20.7 over the lower side of the line through the loop of a substation 274, back over the upper side of the line, inner armature and contact of cutoff relay 207 through the, right-hand winding of relay. 201 to ground. Relay 201 energizes and completes a circuit from battery, through the left-hand winding of common starting relay 204, resistance 202, contact and armature of relay 201, resistance 203,1to-groun'd through the right-hand winding of relay 204. Through thelett-hand winding of relay 204 and resistance 202, a selectable-potential is also placed upon the multiple terminals 2100f all first line finders having access to the group containing the calling'line; The starting relay 204 by attracting its armature 'closesa circuit .tor the powerjma gnet 211 ofall idle the winding of power magnet 211,,Winding of relay 205 to ground at'the armature of relay 204. The power magnets of such line finders operate to cause the movement of the brushes over the terminals of the group in search of thecalling line. If the brush 275 of any idle line finder happens to be standing upon terminal 210 at this time, or as soon as the brush 275 of a searching finder reaches said terminal, a circuit is established from battery, through the left-hand winding of relay 204, resistance 202, contact and armature of relay 201, terminal 210, brush 275 through the right-hand high resistance winding of test relay 214 to ground. Relay 214 thereupon energizes and closes a circuit through its left-hand low-resistance winding, contact and armature, through the winding of the second test relay 212 to ground in parallel to its high resistance winding. The low resistance of this circuit causes a reduction in the potential upon terminal 210 which will, in a known manner, render the calling line busy to other line finders. Relay 212 opens the above-traced power circuit and closes a circuit from battery through the armature and contact of relay 213, armature and front contact of relay 212, through the holding magnet 215, through the winding of the common starting relay 216 to ground. Magnet 215 operates to bring the brushes of the finder switch to rest accurately centered upon the terminals of the calling line, and the relay 216 closes a circuit to start the operation of idle second line finders. This circuit leads from ground through the armature and contact of relay 216, sequence switch contact 226 of the sequence switch 220, armature and back contact of relay 232, sequence switch contact 223 bottom, through the winding of power magnet 241 to battery and ground. Magnet 241 causes the rotation of the brush carriage to search for the terminals of the calling first line finder. The test relay 212 on operating, closes a circuit from battery, armature and contact of relay 213, armature and front contact of relay 212, resistance 217 to the multiple terminals 230 of the second line finder switches, thereby placing a selectable potential thereon. As soon as the brush of a second line finder reaches the terminal 230, a circuit is completed from such terminal through the righthand high-resistance winding of test relay 234, sequence switch contact 227 top, to ground. Relay 234 by energizing closes a circuit through its left-hand low resistance winding, contact and armature, sequence switch contact 229 top, through the winding of the second test relay 232 to ground, in parallel to its high resistance winding. The low resistance of this circuit reduces the potential on terminal 230 to render the same nonselectable. As soon as the brushes are accurately centered, relay 232 energizes, opens the above-traced circuit for the power magnet 241 and closes a circuit from battery through the winding of sequence switch magnet 220, contact 231 bottom, front contact and armature of relay 232, contact 226 top, to ground at the armature of the starting relay 216, driving the sequence switch 220 out of position 1. A circuit is also closed at this time from battery through the winding of the holding magnet 245, contact 222 top, contact 231 bottom, front contact and armature of relay 232, contact 226 top, to ground at the armature of relay 216, which operates to properlv position the brush carriage.

The number of second line finders in a group may be comparatively large, and in order to reduce the number of simultaneously rotating second line finders during the slack hours, these finders are arranged in pairs so automatically controlled that only one line finder of each pair is able to search for a call at the same time. The manner in which this is accomplished will appear presently.

Bis sequence switch 220 leaves position 1, the circuit through the high resistance winding of test relay 234 is opened at contact 227 top. through the low resistance winding of relay 234 and the winding o1 relay 232 is also opened at the sequence switch contact 229 On leaving position 3, the circuit top. Sequence switch 220 on reaching position 3 closes a circuit from battery through the winding of cutoff relay 207, terminal 218, relay 213, terminal 238, contact and left-hand armature of relay 224to ground, over the sequence switch contact 233 bottom. Relay 213 by operating removes the poten tial from the terminal 230 so that this circuit cannot be seized. This relay also opens the energizing circuit for the common starting relay 216, which thereby opens the power circuit of other searching second line finders. The cutoff relay 207 energizing in series with the relay 213, disconnects the line relay 201 from thecalling line, which in turn allows the starting relay204 to be deenergized, thus opening the power circuit for all first line finders which were started in operation by the initiation of the call. Test relays 214 and 212 also deenergize at this time.

It will be observed that the register mag net 208 associated with the calling line is connected in parallel with the cutoff relay 207 to ground when sequence switch 220 reached position 3. However, this magnet being marginal does not receive sufficient current to operate. I

As the sequence switch 220 moved into position 2, a circuit was completed to drive the sequence switch 220 of the other second line finder of the pair out of position 13,

where it stands while said finder is idle, into position 1, ready to control the finder on the incoming of another call. This circuit may be traced from ground, sequence switch contact 227 bottom, of the sequence switch shown, conductor 276, conductor 277, over the sequence switch contact 222 at the other line finder, through the sequence switch magnet 220 to batteryand ground. Upon the sequence switch 220 of the line finder shown coming to rest in position 5, the test relay 232 is now energized in the circuit from battery, through the winding of relay 235, back contact and right-hand armature of relay .224, sequence switch contact 229 bottom through the winding of relay 232 to ground. Relay 235 by attracting its armanected in series with each other across the conductors of the trunk.

When the sequence switch 220 in the satellite reached position 5, a circuit was closed from battery through the winding of relay 239, sequence switch contact 240 bottom, over the upper conductor of trunk 250, right-hand armature and back contact of relay 253, outer armature and contactofcutofl' relay 257, through the windings of the line relay 251, contact and inner armature of relay 257, contact and left-hand armature of relay 253, over the lower conductor of the trunk 250, sequence switch contact 236 top, to ground through the resistance 242. The line relay 251 energizes, but relay 239 being marginal does not receive suflicient current in series with the resistance 242 to attract its armature. Relay 251 causes the illumination of the line lamp 252 in the usual manner. The operator observing this signal handles the call in exactly the same manner as calls appearing on lines local to the exchange. When the answering plug 261 is inserted into the jack 254, a circuit is completed from ground through the winding of cutoff relay 257, sleeve of the jack and plug to battery and ground at the repeating coil 267.

in the operators cord circuit. Relay 257 opens the circuit of line relay 251 and a circuit is now completed for the windings of relay 239 over the upper conductor of the,

trunk 250, right-hand armature and back contact of relay 253, tip of jack 254, tip of the plug 261 to ground at the repeating coil 267. Relay 239 energizes in this circuit andcloses a circuit including the sequence switch contacts 244 and 243 bottom to drive sequence switchf220 out of position 5 and into position ,12. 3

As soon as sequence switch 220 reaches position 6, the right-hand-windings of the repeating coil'237 are connected to the trunk over contacts 240 and 236; the marginal relay 246 and release relay 225 being included in the bridge across the trunk. The circuit ofthese relays may be traced from battery, in the opera-tons cord circuit, through the winding of supervisory relay 268, ring of the plug 261 and jack 254, back contact and left-hand armature of relay 253, contact 236 bottom, lower right-hand winding of repeating coil 237, left-hand low resistance winding of relay 246, front contact and armature of calling line supervisory relay 228, left-hand low resistance winding of relay 2 25, upper right-hand winding of repeating coil 237, sequence switch contact 240 top, right-hand armature and back contactof relay 253,,tip of the jack 254 and plug 261, to the other pole oi battery.- It will be noticed that the supervisory relay 228 being energized in series with the calling line, places a short circuit relay 268 to short-circuit the calling supervisory lamp in the operators cord circuit.

-Upon the calling subscriber replacing his receiver to the switchhook, relay 228 deenergizes and removes the short circuit around the high resistance winding of relays 246 and 225, causing the deenergization of relay 268 and consequently the display of the supervisory signal. The relay 246 being marginal does not energize in the above-traced circuit. Relay 225, however, attracts its armature and closes a new circuit for relay to ground in shunt of'it's original circuit,

which included thewinding of relay 232. Relay 232 thereby releases its armature before sequence switch 220 can" reach position 12, move by means of a circuit closed over contact 231 bottom, front contact and armature of relay 232 and contact 226 bottom.

The operator receives the number of the desired line from the calling subscriber and proceeds in the usual manner to complete the connection. If the called line is busy, if the called subscriber does notanswer, or if for any other reason the call-is not success fully completed, the operator-does not depress her charge key 263 to register the call against'the calling line. On withdrawing the plug 261 from the jack of the trunk 250, release relay 225 is deenergized. 'On re-, tracting its armature the above-described short circuit. is" removed from around the winding of relay 232, which again energizes in series with relay 235. A. release circuit is where it would otherwise continuev to thereby'closed'for sequence switch 220 over ground. The sequence switch 220 moves out of position 12 through positions 13 and 1a and comes to rest in position 18, where it waits for the sequence switch 220 of the other line finder of the pair to move out of position 1. In passing out of position 17, the circuit of relays 235 and 232 is opened at sequence switch contact 229 bottom, and these relays release their armatures. As the sequence switch 220 leaves position 14:, contact 233 bottom is also opened and relays 213 and 207 are deenergized. The cutoff relay 20? connects the line relay 201 to the subscribers line ready for the initiation of another call.

It the operator establishes a successful connection to the called line, she is advised of this fact. by the usual called line supervisory signal. She thereupon depresses the charge key 253 to prepare for the operation of the message register 208 individual to the calling line. The actuation of key 263 closes a circuit fromv battery, through the winding of magnet 26%, key 263, sleeve of the plug and jack through the righthand winding of re lay 258, to ground. Relay 258, being mar ginal, did not operate in parallel with the cutoff relay 257, but does receive sui'licient current in the circuit just traced to attract its armature. The energization of relay 258 closes a circuit through its left-hand low resistance winding, contact and armature, to ground through the winding of low resistance relay 253 in parallel to the circuit through the right-hand high resistance winding of relay 258. The resistance in series with magnet 26 1, which is also marginal, is now reduced sufi iciently to permit said magnet to energize and operate the register at the operators position. Helay 253 attracts its armatures and places the high voltage battery 256 across the trunk line 250 through a'retardation coil 255. The increased flow of potential from the battery 256 is now suificient to cause the operation of marginal relay 246 in the satellite. Relay 246 closes a circuit from the metering battery 2 19 through the armature and contact of relay 2 1-6, resistance 24-7, through the winding of marginal relay 239, to the opposite pole of battery and ground. Relay 239 closes a locking circuit for itself independent of the armature and contact of relay 2% from battery through the winding of relay 239, resistance 247, sequence switch contact 243 top, contact and armature of relay 239, sequence switch contact 244: top to the metering battery 2 19 and ground. The retardation coil 255 serves to reduce the inductive effect to prevent annoying clicks in the subscribers receiver in case the operator depresses the key 263 to charge the call during the period that the subscribers are in con versation. As soon as the key 263 is released, relay 253 retracts 1ts armatures and completes trunk circuit 250 for conversation.

When marginal magnet 264 energized, it closed a. circuit for lamp 280 to inform the operator that the mechanism for bringing about the registration of'the call" had operated andthat charge key 263 might be released;

After the conversation has been completed, the operator withc raws the plug 261, release relay 225 de'e'nergizes, relay 232 attracts its armature and sequence switch 220 starts from position 12 and moves into position 13 in the ,manner hereinbefore described. In this instance, however, since the operator has impressed her charge key 263, a metering circuit has been prepared for the operation of register 208, whichcircuit is now completed by the sequence switch 220 as it is moving through its releasing positions. This circuit may be followed from the positive pole of the metering battery 2 1-9, sequence switch contact 244, armature and contact of relay 239, sequence switch contact top, sequence switch contact 233 top, left-hand armature and contact of relav 22 1:, winding of relay 213, through the winding of 7 negative pole of battery and ground. This circuitit'will be seen is closed while the sequence switch 220 is passing from position 14 to position 18, and the increased flow of current is snflicient to operate the message register magnet 208 to charge the call.

Should the calling subscriber abandon the call after his line has been extended over a trunk to the manual exchange before the (gr-orator answers by inserting a plug in the jack of the trunk, the supervisory relay 228 becomes dei nergized. As has been seen, the sequence switch 220 is standing in position 5 at this time. A circuit is therefore closed fr m ground, through sequence switch contact 2 1-3 top, armature and back contact of relay 223, sequence switch contact 231 top, to drive the sequence switch 220 into position Tn position 12, since relay 225 is deenergized, the operator having failed to answer the call, no shunt exists around relay 232, and hence relays 235 and 232 are enerin series. The above-traced release circuit for sequence switch 220 is therefore closed atthe front contact of relay 232, and

said sequence switch is driven into its resistance winding of relay 234 is discon L116 marginal magnet 208, to the positions 4; to 17 in s vents th'coperation-ct relay from this relay is not ahleto maintain its ener- 'ization it two test rela s are hrou 'ht Lin :9 J b A parallel with the same terminal230. Relay 23% thereby releases its armature and in con.- sequence rr ay 282-isdei nergizod. the passing to position 2, sequence' switch 220 closes a circuit from battery through'the winding of relay-221, contacttop, back contact and armature relay 232, to ground at contact bottom. Relay 22 lenergizes and is maintained energized in position 301"" the sequence switch over its front contact and armature to ground sequence switch contact 24.8 bottom, and r iains ener ised in ms with relay 232, which'circuit may be raced from battery, through winding of rci y 22%, front contact and right-hand armature thereof, sequence switch contact 229 bottom, winding of relay 232 to ground. Relay 232 energizes and closes the ahove traced release circuit "for the sequence "switch 220, which moves into position 18. Relay by energizing preconnecting'the repeating coil 23'? to the ing line. 1

"As hereinbefoieexplained,the trunk circuits 250 coming from satellites-or other automatic switchin points may appear indiscriminately herore the operator among the local lines to the exchange. 3y thearrangement used, call registration for the satellite lines,-together with call registration for lines local to the exchange, is controlled at the operators cord circuit by" the same means, without it being necessary for the operator to know what kind of a call she is handling. 7

In Fig. 2-is'showna local'subscribers line 284 terminating-mack 281 at the operators position. The line relay 282 in this case is operated in the'usual manner by battery at the exchange, With plug 261 inserted in jack 281,"the' operatorby closing her charge key closes a circuit over the sleeve of the plug 261 and jack'281 to energize the marginal magnet 283. This circuit in cludes marginal magnet 2641 and is'similar .to the circuit traced for marginal relay 258 in connection with a call over trunk 250. Magnet 283 operates to register the call against the local'calling line and to close a circuit through its low resistance winding to permit the energization of magnet 264:, which causes lamp 280 to light, thus informing the operator that registration is properly taken care of and the key 268 may be released. I i

A feature to he observed in the metering arrangement embodying this invention is that the operator in the manual exchange may prepare for the registration of a call in the satellite at any time after she has learned that the call was successfully extended. By this means she may depress her callcharge key immediately upon theoperation of theca-lled supervisory signal, if desirable, and go on with her duties without having to carry in mind that the call must be charged at the tilne Of disconnection.

"W hat is claimed is:

1. In a telephone system, telephone lines, an operators position, connecting circuits for extending said lines to the operators position. a register associated with each of said lines, automatic means for operating said registers during the release of the connecting circuits, and means under the control of the operator for rendering eftective said automatic means;

2. In a telephone system, telephone lines,

an operators position, automatic switches for extending a calling line to said position,

a message register associatedwith said line, means operative during the release of said switches for operating said register, and means under the control of the operator for rendering said means efi'ective. I

In a telephone system, telephone lines, an operators position, automatic switches for extending a calling line tosaid position,- a message register associated with said calling line, a controlling sequence switch individual to one of said switches, means opera tive under the control of said sequence switch for operating said register, and means controlled by the operator for rendering said sequence switch effective to control said.

means.

ii In a telephone system, telephone lines,

automatic switches for extending said lines,

a register associated with each of said lines,

registercontrolling means automatically op erative upon 't-he release of saidswitches to operate said registers, and'manual means for renderingsaid controlling means effective to operate said-registers.

' 5.1a a telephone sy'stem,tele'phone lines,

' an operators' position, "means comprising automatic switches for extending said lines to establish connections, registers, one. associated with each of said lines, means automatically operated upon the release of a connection for controlling the operation of said registers, and m'eansunder. the control of the operator as soon as a connection has been extended for placing said registers under thefcontrol of said' automatically op erated means. i V

6. In telephone system,telephone lines, a line finder for extending said lines, a controlling switch for controlling said finder, a messageregister associated with'each of said lines, means under the control of said. controlling switch for operating said'register during therelease of the line finder, and manual means for rendering such controlling switch efiective to control the operation of said register.

7 In a telephone system, telephone lines,

a connecting circuit for extending said lines, a device for controlling said connecting circuit, message registers associated with said lines, a source of current for operating the message registers, said controlling device being operative to apply said source to the message registers during the release of said connecting circuit, manually operated means for rendering said source subject to the control of the controlling device.

8. In a telephone system, telephone lines, a connecting circuit for extending a calling line, a message register associated with the calling line, an operating circuit for said register normally open at two points, automatic means for closing said operating circuit at one point each time said connecting circuit is released, and manually controlled means for closing the operating circuit at the other or" said points.

9. In a telephone system, a satellite, subscribers lines terminating therein, an exchange, an operators position in the eX- changc, "trunks inter-connecting the satellite and exchange, automatic switches for extending a calling line to one oi said trunks, a message register associated with the calling 1i re, automatic means in said satellite for controlling the operation of said register during the release of the automatic switches, and means under the control of the operator for rendering said antomatic means efiective to cause the operation of said register. 7 I

10. In a telephone system, a satellite, subscribers lines terminating therein, an exchange, trunk lines interconnecting said satellite andexchange, an operators position in said exchange, automatic switches for extending a connection from a calling line in the satellite over one ofsaid trunks to the operators position, a message register associated with the calling line, means in the satellite for automatically controlling nssmvr the operation of the message register during the release of said connection, and means subject to the control of the operator as soon as said connection has been extended for rendering said first means effective to control the message register.

11. In a telephone system, an operators position, a line terminating in said position, a second line, automatic switches for extending the same to the operators position, a register. associated with each of said lines, a manually operable device at said operators position for causing the operation of the register associated with said first line, means automatically operated upon the release of said switches for controlling the operation of the register associated with said second line, and means responsive to the operation of said manually operable device for placing the last-mentioned register under the control of said automatically operated means.

12. In a telephone system, an operators position, a line terminating in said position, a second line, automatic switches for extending the same to the operators position, a register associated with each of said lines, a manually operable device at said operators position for causing the operation of the register associated with said first line, means automatically operated upon the release of said switches for controlling the operation of the register-associated with said second line, means responsive to the operation of said manually operable device for placing the last-mentioned register under the control of said automatically operated means, and a signal at the operators position operated each time said manually operable device is operated.

In witness whereof, I hereunto subscribe my name thisllth day of February, A. D.

LIPA POLINKOWSKY.

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