US1271185A - Telephone-exchange system. - Google Patents

Description

' A. E. LUN'DELL.

TELEPHONE EXCHANGE SYSTEM.

APPucmoN man 0c.22. 1915.

Patented July 2, 1918.

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A/ben E. Lam de Affy.

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of New York, have 'angl useful Improvements in Telephone-EX- ALBEN n. runners, on new roan, n. r,

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ASSIGNOR TO WESTERN ELECTRIC N. Y., A CORPQRATION OFNEW YORK.

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TELEPHONE-Emanuel; sysrmvr.

Specification of Letters Patent.

Patented aai s, ieis,

Application filed December 22, 1915. Serial No. 68,209.

To all whom it may concern Be it known that 1, ALBEN E. LUNDELL, a citizen of the United States, residing at New York, in the countyof Bronx and State invented certain new nge Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone exchange systems, and more particularly to semi-automatic telephone systems in which a connection may be established between two lines through a plurality of oilices.

It is the object of this invention to provide new and improved means at one oflice for supervising the establishment of a connection.

According to the main feature of this invention, a plurality of signals, provided at an operators position, are initially controlled from each end of the connecting circuit, means being provided for controlling all of said signals from one end of the connecting circuit upon the complete establishment of the desired connection.

The drawings represent diagrammatically a semi-automatic telephone exchange system embodying the features of the present invention.

The selectors, sequence switches and the ender for controlling said selectors forming no part of the present invention, are only diagrammatically represented in the drawings, and their operation is referred to only in a general way in the description. It will be obvious to those skilled in the art that the present invention may be practised in a telephone system in which manual means only or together with automatic selector and connector switches of widely varying character are employed without departing from the spirit of the invention. A description or a preferred form of automatic selectors, sequence switches and of a registering and sending apparatus for controlling the o. eration of said selectors may be had from. my copending application Serial No. 786,165, filed August 22, 1913.

A subscriber located at station 10, desiring to obtain a connection to a station 11 connected to the same exchange to which his line is connected, removes his receiver from the switchhook, causing thereby the actuation of a well-known line signal (not shown) in fr nt of an operator controlling a connecting circuit 12. The connecting operator, noticing the signal, inserts her plug 13 into an answering terminal 'or jack 14:

in which the line of station terminates, causing thereby the closure of a circuit from grounded battery, through resistance 15, sleeve contacts of jack 14 and plug 13, and the winding of a relay 16 to ground. The calling line signal is extinguished in the well-known manner and a circuit is closed from the minus pole. of battery through the primary winding of a repeating coil 17, the winding of an answering supervisory relay 18, the ring contacts of plug 13 and jack 14, the calling substation line circuit, the tip contacts of jack 1% and plug 13, and the primary winding of re peating coil 17 to the plus pole of battery. Relay 18 becomes energized and closes a shunt from its front contact through conductor 19, on one hand through sequence switch contact 27, and on the other hand through conductor 20, the upper armature and back contact of a relay 21, around a supervisory lamp 22, the circuit comprising also a resistance 23 and the armature of relay 18. Relay 16 closes a circuit from ground through its armature and front contact, contact 24 and the power magnet of a sequence switch 25 to grounded battery, whereby the sequence-switch is moved, under the control of a normal spring 26, out of its first position into its twelfth position. Positions 2 to 11 of this sequence switch are made use of to control the connection of the operators telephone set, the set being. connected to the connecting circuit in position 7 or the sequence switch, andfurthermore, in these positions of the sequence switch, the operation of selector switches 30,- 31 and connector switch 32 is controlled. These switches are caused to select the desired line in position 11 of sequence switch 25 under the control of the connecting operators registering and sending apparatus. The desired station being located in the same exchange, the operator adjusts selector to select a trunk leading to selector 31' by depressing a key 33 provided in her sending apparatus. 1:" a registering switch 3' 1, asso ciated with the sender, is in position 11, a circuit will be closed from ground through key 33, contact 35 and the power magnet of register 34 to grounded battery, whereupon,

under the control of a s rin 3%. the p y/ register is moved out of position 11 into position 1. If this register is in any other position than in position 11,, the actuation of key 33 will not cause the displacement of the register. During the sending out of impulses, a sequence switch (not shown) controlling the operation of a cord finder 37 closes its contacts 38 from positions 4 to 15. The register 34 being out of position 11, no circuit will be established for relay 21, and ,{herefore a circuit is closed from ground, hrough sequence switch contact 54, the lower armature and back contact of relay 21, contact and the power magnet of sequence switch 25 to grounded battery, for driving this sequence switch out of position 12 into position 14. In position 14 of the sequence switch, a circuit is closed from ground, through sequence switch spring 40, a lamp 41, resistance 42 to grounded battery, and this lamp is lit, indicating to the connecting operator that the desired line has been seized and is being signaled. The signaling of the called station is controlled by well'known apparatus associated with selector 31 or connector 32. When the called subscriber at station 11 removes his receiver from the switchhook, a circuit is closed from the minus pole of battery through the secondary winding of repeating coil 17, the winding of a calling supervisory relay 43, sequence switch contact 44, the called substation loop, sequence switch contact 45 and the secondary winding of repeating coil 17 to the plus ole of the battery. Supervisory relay 4 becomes energized and closes a circuit from ground through its front contact and armature, sequence switch contact 46, conductor 47 and the power magnet of sequence switch 25 to grounded battery, for moving this sequence switch out of position 14- into position 16. Lamp 41 is now extinguished and a circuit is closed from ground, through sequence switch contact 53, lamp 52 and resistance 42 to grounded battery. This lamp, however, is prevented from lighting due to the closure of a shunt from ground through the front contact and armature of supervisory relay 43, sequence switch contact 50, resistance 51, lamp 52,

and sequence switch contact 53 to ground.

Upon the completion of the connection, the sending and controlling apparatus is re leased to normal in the well-known manner.

After the termination of the conversation, the subscriber at station 11 hangs up his receiver, and may cause, in the well-known manner, the restoration of switches 32 and 31. Belay 43 becomes deenergized and opens the shunt placed around lamp 52, and

this lamp will belighted. The lighting of lamp 52 indicates to the operator that the subscriber at station 11 is through talking. When the calling subscriber at station 10 restores his receiver to the hook, relay 18 will become denergized and open the shunt placed around lamp 22, whereupon lamp 22 will be lighted due to the closure of a cir cult extending from ground, through sequence switch contact 60, lamp 22, and resistance 61 to grounded battery. The opera tor noticing now that both supervisory lamps are lighted, removes plug 13 from jack 14, deenergizing thereby relay 16, which closes a circuit from ground through its armature and back contact, contact 62 and the power magnet of sequence switch 25 to grounded battery, causing thereby the sequence switch to move out of 16 into its normal position. Selector 30 will be released and lamps 52 and '22 extinguished.

It will be noted from the above that supervisory relays 18 and 43, provided in the connecting circuit and controlled from the two ends of the connecting circuit by the calling and called subscribers respectively, control the supervisory signals 22 and 52 respectively. .The operation of one supervisory relay will not affect the signal. associated with the other supervisory relay in order to prevent the giving of the clearing-out signal (lighting of both lamps) to the operator if only one of the subscribers engaged in conversation restores his receiver;

lit the subscriber at station 10 desires to obtain a connection to a station 65 associated with a distant exchange, it will be necessary that this call be recorded at the calling subscribers exchange.

Upon the removal of the receiver at stationlO and the insertion of plug 13 into jack 14,'relay 16 will cause the movement of sequence switch 25 out of position 1 into position 12 in the above described manner. The connecting operator now sets selector 30 (in position 11 of sequence switch 34) to select a trunk terminating in a jack 66 at a recording operators position. When sequence switch 25 reaches its position 12, a circuit is closed from grounded battery through the winding of a relay 67, selector 30, sequence switch contact 45 and the secondary winding of repeating coil 17 to ground. Relay 67 closes a circuit from ground through its front contact and armature, the armature and back contact of relay 68 and lamp 69 to grounded battery, for signaling the recording operator. A circuit is also closed from ground through sequence switch contact 40, lamp 41 and resistance 42 to grounded battery, and the lighting of lamp 41 will indicate to the connecting operator that the recording operator is being grounded battery; Relay 43 closes a circuit from ground through its front contact and armature, sequence switch contact 46, conductor 47 and the power magnet of sequence switch to grounded battery, for moving this switch out of position 12 into positien 13.

The sequence switch will not be moved out of position 13 by a circuit through sequence switch contact 54 for the following reasons: In order to set-selector on a trunk terminating in a jack in front of the recording operator, the connecting operator depressed key 72 instead of key 33. If register 34 was in a position between circuit was closed from ground through key 72, contact 73 and the power magnet of register 34 to grounded battery, for causing the movement of this register through position 10 into position 11. In position 11 a circuit is closed from ground through register con tact 64, cord finder sequence switch contacts 38, and the winding of relay 21 to grounded battery. Relay 21 becomes energized and locks up through a circuit closed from ground through ,sequence switch contact 54, and the lower armature, front contact and winding of this relay to grounded battery, opening at its lower back contact the circuit for sequence switch 25. By attracting its upper armature, relay 21 opens ,the shunt around lamp 22. However, another shunt is closed for this lamp from ground through the front contact and armature of supervisory relay 43, sequence switch contact 74, conductor 19, the front contact and arma ture of supervisory relay 18 and resistance 1 23. A shunt being placed around lamp 22 through sequence switch contact 27, this lamp will not be lighted in position 12 of the sequence switch upon the energization of relay 21.

The recording operator converses now in the well-known manner with the calling subscriber, and after having obtained his number and the number of the desired subscriber, will make out the usual toll ticket. The recording operator will converse with a switching or incoming operator located at the same exchange at which the connecting operator is located and controlling selector switch 76 and connector switch 77. The switching operator, having received the number of the calling station from the recording operator. causes said switches to extend one end of a connecting circut 7 8 to the calling terminal 90 of station 10, and will instruct the recording operator through an order wire (not shown) which trunk is used. The recording operatornotes the number of the trunk on the toll ticket, and sends the same to atoll operator controlling connecting circuit 75. The trunk assigned for use terminates in a jack 79 in front of the toll operator. She will extend her conpositions 1 and 10, a.

f the restoration of ing and called necting circuit by means of her plug 80 arid jack 79 through connecting circuit 78 and switches 76 and 77 to the calling substation 10, and extend the other end of her connecting circuit 75 by any well-known means to the called subscribers station 65. The recording operator will engage bymeans of her plug 81 a jack 82 connected in multiplc to jack 79, causing thereby the establishment of a circuit from ground, through the Winding of a relay 83, the sleeve contacts of plug 81 and jack 82, conductor 84, the sleeve contacts of jack 79 and plug 80, and resistance 85 to grounded battery. Relay 83 be comes energized and closes a circuit for a lamp 86, indicating to the recording operator that the toll operator has taken care of the call.

The recording operator, after having made out the toll ticket, proceeds to sever the original connection established between her position and the calling substation. By removing plug 70 from jack 66, she opens the circuit of relays 71 and 43. Relay 43 re moves upon its de'nergization the shunts closed around lamps 22 and 52, causing thereby the lighting of both these lamps. The connecting operator will know now that this'connection may be takentdown. She will pull plug 13 out of jack 14, causing thereby selector 30.

It will be seen thus that in case of a toll call, a single supervisory relay 43 controls the calling and called supervisory signals, this being necessary as the supervisory re lay 18 remains energized as long as plug 13 is inserted into jack 14, the calling sub-- scriber being engaged in a toll connection. The severing of the toll connection will be accomplished in the well-known manner under the control of the toll and switching op erators.

What is claimed is 1. In a telephone exchange system, a pinrality of lines, a connecting circuit by means of which two lines may be interconnected, a plurality of supervisory signals individual to said circuit, and means under the sole control of one end of said circuit for operatingsaid signals.

2. In a telephone exchange system, a plurality of lines, means for extending a calling line to a called line, a clearing-out signal, means jointly controlled through said calllines for lighting said signal, and means operative upon the extension of a calling line to another called line for lighting said signal under the sole control of said last mentioned line.

3. In a telephone exchange system,='a plurality of lines, means for establishing a connection between a calling and :1 called line, two supervisory signals, means operable upon the establishment of a certain conneo loo tion for controlling one of said signals from the calling; and the other of said signals from the called end of said certain connection, and means responsive to the establish ment of a certain other connection for controlling both of said signals from the called end of said certainother connection 4. In a telephone exchange system, a plu rality of lines, operators positions, means for establishing a connection between a calling and a called line, two supervisory signals, means for controlling one of said supervisory signals through the calling" line, means operative upon the establishment of a connection between two of said lines for controlling the other supervisory signal through the called line, and means operative upon the establishment of a connection to an operators position for controlling both said supervisory signals through the called end of the connection.

5. In a telephone exchange system, a plurality of lines, two supervisory signals, a connecting circuit, means for extending the same to a calling line, means operative thereupon for actuating one of said supervisory signals, means for extending said connecting circuit to a called line, means operative thereupon actuating the other supervi sory' signal, and means operable through said called line for controlling the operation of both said supervisory signals.

6. In a telephone exchange system, a pluality of lines, a connecting circuit, means for extending said circuit to a calling line,

a selector switch for extending said circuit to 2. called line, a variably operable sender or controlling said switch, a plurality of supervisory signals, and means actuated in ccordance with the operation oi said sender or controllingsaid signals through the called line.

it". in a telephone exchange system, a pin rality of lines, a connecting circuit, means for extending saidcircuit to a calling line,

a selectively adjustable switch for extending said circuit to a called line, a plurality of supervisory signals, and means responsive to adjustment of said switch for controlsaid signals from one end of said cirin a telephone exchange system, a plo rality of lit cs, a conneinp; circuit, "vo supervisory relays in said circuit, two supervisory signa means for extending said circuit to a call; line, means operative thereupon for actuating one of said relays, means for extendi said circuit to a called line, means OPGl'ftchQ thereupon for: actuating anmy name this 18th day other one of said relays, means controlled by said one relay for operating its associated signal, and means controlled by the other re lay for controlling both said signals.

59. In a telephone exchange system, a plurality of lines, a connecting circuit, two supervisory relays in said circuit, two super visory signals, means for extending said connecting circuit to a calling line, means for extending the other end of said circuit to a called line, and means controlled by one of said relays for placing a shunt around each of said signals.

10. In a telephone exchange system, a plurality of lines, a connecting circuit, means for extending one end of said circuit to a calling line, means for extending the other end or said circuit to a called line, two supervisory relays in said circuit, two supervisory signals, means operative upon the extension of said circuit to a calling line for causing relay to place a shunt around one of saidsignals, means operative upon the extension of said circuit to a called line for causing the other relay to place a shunt around the other signal and a shunt around said first mentioned signal, and means for removing'said first mentioned shunt.

Ill. a telephone exchange system, a connecting circuit, two supervisory relays in said circuit, means for extending said circuit to a calling line, means for extending said circuit to a called line, two signals, means for placing one of said signals under the control of one of said relays upon the extension of said circuit to the calling line, and means for placing both of said Sig .als under the control of the other relayupon the extension of said circuit to the called line.

12. a telephone exchange system, apluraiity of lines, a connectingcircuit, two supervisory relays provided in said circuit, two supervisory lamps, contacts for said relays, means for extending said circuit to a callingline, means operative thereupon for closing a shunt through the contact only one of said relays around one of said lamps, means for extending said circuit to a called line, means operative thereupon for closing a shunt around the other lamp leading only through the contact of the other relay, means for closinga shunt around said first mentl ned lamp leading}; through contacts of both said relays, and means "for ren'ioving l mentioned shunt.

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