US1147025A - Telephony. - Google Patents

Description

M. L. JOHNSON.

TELEPHONY. APPLICATION FILED APR, 5, 1913- 1,147,025. Patented July 20, 1915.

3 SHEETS-SHEET 1.

WI TNE S S E S INVENT on W Moa ron L. {JOHNSON BY 7 ATTORNE M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR-5,1913.

1,147,025. Patented July 20, 1915.

3 SHEETS-SHEET 2.

INVEN T OR G u a MORTON. JOHNSON BY @21 ZZZ /Z% W ATT ORN EY WITNESSES COLUMBIA PLANGORAPH co.,wAslllNuToN D c M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR-5.1913.

1,147,025. Patented July 20, 1915.

w 3 SHEETS-SHEET 3.

FIG. 3

WITNESSES I INV'ENTOR & MORTONLIJOHNSON ATTORNEY COLUMBIA PLANOGRAPH c0 WASHINGTON. D. c.

invrrnn STATES PATENT orrrcn.

MORTON L. JOHNSON, or oHIcAso, ILLINOIS, ASSIGNOR, BY ivInsNE ASSIGNMENTS, To FRANK 13. 000 COMPANY, or CHICAGO, ILLINoIs, A CORPORATION or ILLINOIs.

TELEPHONY.

Specification of Letters Patent.

Patented July 20, 1915.

f Application filed A ri15,1913. s iia1Na75ao2a T whom it may concern a Be itknown that I, MORTO L. J HNSON, citizen of the United States, residing at Chicago,cin the-county of Cook andState of Illinois, have invented a certain new and useful Improvement in Telephony, of which the following is a full, clear, concise, and exact description, reference being had to g the accompanying drawings, forming a part of this specification.

The invention has for one of its objects the provision of means controlled by each selector switch which is the first to select a responsive device'for holding a succeeding responsive device hunting selector switch in position to connect the SL1TIBIQSPOIIJSIVG device with the calling line operatingsuch succeeding. selector switch and operator .con-

trolled vmeans for freeing the selected responsive device from the first selector switch and'bringing it into connection with the sec ond selector switch and thereby with the calling line'operating the second selector switch.

The invention has for another of its obects the provision of a group ofl nk connectors at the/exchange for each operator to whose use it isadapted in connecting calling I and called lines, signal devlces for thellnk connectors of each. group, and means governed by equipment of the link connectors for causing such s gnal devices to operate whenthelr link connectors are idle and to restore the signal devices when their link connectors are taken for use.

I will explain myinvention more fullyby reference to the accompanying drawings showing the preferred embodiment thereof and in which Figure is a very view illustrating, in simple form, the essential features of the invention as they are preferably embodied; and Figs. 2 and 3,

taken collectively end to end with the discontinued conductors at .the right hand end of Fig. 2 in alinement with the discontinued conductors at the left hand of Fig. 3, illustratethe preferred embodiment of the in vention in diagrammatic detail.

Like parts are indicated by similarcharacters of reference throughout the different figures.

Referring first more particularly. to Fig. 1, I have there indicated two subscribers stations 120 and 190 each having a selector general. diagrammatic switch A, B individual to its line but to which individual selector switches the invention is not to be limited. These selector switches have wipers which move over waiting-contacts that pertain to telephone line extensions C, D which are peculiar to calling lines and are included in connections between calling and called subscribers only at the calling line ends of such connections. There are preferably fifty extensions C or D apportioned to the use of each operator and the extensions of each operators group are each provided with multipled waiting contacts distributed among the switches of such operator. The wipers of the switches E or F, selected for use by the operator, are moved by operator controlled means over the waiting contact terminals of the calling line extensions, these switches being inclividual to link connectors whose connecting ends are here shown as terminating in connecting' plugs G, the plugs G belonging to switches-E being at one operators position and the plugs G pertaining to the switches F being at another operators position, there being desirably twenty five such plugs to each operators position and, of course, as many switches. The calling line extensions C, D are here shown as being divided into groups each group being individual to an operators position and the selector switches A, B, in additionto selecting idle extensions C, D, will also select the corresponding calling line operated operators responsive device which may be in the form of a signal lamp H or an operators telephone I, or both of these classes of-devices. When a calling subscriber selects an idle calling line extension and the responsive device peculiar to the operators position to which the selected extension belongs, the operator will select an idle link connector for joining the calling line with the desired line and will cause the operation of the switch E or F by means of a keyK individual to such. switch and the link connector having such switch to connect the corresponding connecting plug G with the calling line.- The operator will complete the connection by inserting the plug G that has become connected with the calling line into a jack L of the called line multipled in her position. The responsive device I, is provided with two relays M either of which, when energized, renders the responsive device I unselectable. The se- I lector switch first operating to energize either relay M connects the responsive device I with the calling line of such switch, there being means (not indicated in Fig. 1) whereby a second hunting selector switch may be arrested in association with the second relay M in readiness to connect the previously selected responsive device I with the second calling line when the responsive device has been freed by the operator when the plug G has become connected with the first calling line, relay mechanism N, operator controlled, performing this latter function.

Each link connector having a plug Gr also has a signal device 0 individual thereto. \Vhen a link connector is taken for use the operators relay P individual thereto efl'aces the associate signal at 0 through the intermediation of a switching device Q, whose motor magnet R is operated whenever a relay P is energized. A switching device S governed by an operators key T may occupy one position so that but one signal lamp 0 may be displayed at a time at one position irrespective of the number of idle links at such position or so that there may be as many signals displayed at O as there are idle links individual thereto. As the system is equipped the link connectors may be idle though their plugs G are inserted in jacks of lines at whose substations the receivers have been restired to their switch hooks.

Referring now more particularly to Figs. 2 and 3, I have shown well known equipment at telephone stations 120 and 190, the equipment at each station including a telephone receiver switch hook 1, a telephone receiver 2, a telephone transmitter 3, a call hell 4, and a condenser 5, the switch hook having a normal'contact for connecting the associate bell and condenser 5 in bridge of its line and an alternate contact for connecting the telephone transmitter 3 in bridge of its line, the receiver being in a closed local secondary circuit in inductive relation to the transmitter circuit. When a subscriber, say at station 120, initiates a call he removes his telephone receiver from its switch hook to engage the switch hook with its alternate contact whereby a circuit is established which is traceable from the upper grounded coil of the difierential cutoif relay 6, the intermediate armature switch of the switching relay 7 and its normal contact, both sides of the calling line by way of the transmitter bridge at the calling station, the lower armature switch of the switching relay 7 and its normal contact, the lower winding of the cutoff relay 6, the line relay 8, to the grounded common battery 9. The armature switch of the line relay 8 is now attracted to establish a circuit traceable from this grounded armature switch of this relay, the contact engaged by this switch, the motor magnet 10, the circuit interrupter 11, to the grounded common battery 9. The motor magnet lOsteps the wipers 12, 13, 14 of the selector switch A of the calling line around until the wiper 14L engages a contact that is connected with the grounded battery 9, whereupon circuit is established traceable from the grounded battery 9, the armature switch of relay 15 and its normal contact, the armature switch immediately above the winding of magnet N, the contact engaged by the wiper 14, the armature of motor magnet 10 and its contact, the winding of relay 7 to ground. The relay 7 establishes a locking circuit for itself traceable from its grounded terminal through its winding, its intermediate armature switch of the left hand alternate contact of this armature switch, both sides of the calling line, the lower armature switch of relay 7, the alternate contact of this armature switch, the wiper 13, the upper intermediate armature switch of relay N and its normal follow-up contact, the relay 16, the relay 15, to the common grounded battery 9. The circuit for the line relay 8 is now opened at the normal contacts of the two lower armature switches of relay 7 whereby the armature switch of relay 8 is released to open the circuit for motor magnet permitting the wipers 12, 13, 14 to remain at rest. The uppermost armature switch of relay 7 is grounded through a common resistance 17 and the common grounded battery 9 so as to place battery in connection with the tip line springs of the jacks L pertaining to the calling lines to make the calling line busy. The relay 15 is now energized to cause its armature to engage its alternate contacts to establish circuits through the calling signal or responsive device H to attract the selected operators attention or for purposes of supervision and through the relay M to connect the selected operators telephone I with the calling line.

The circuit for the element H is traceable directly to the groimded battery 9 connected with the armature switch of relay 15. The circuit for the relay M is traceable from the grounded battery 9, the armature switch of relay 15, the right hand alternate contact of this armature switch, the winding of relay M, the lowermost armature switch of the companion relay M and the normal contact of this armature switch to ground. The first relay M is energized to attract this armature switch, the two upper most armature switches serving to connect the operators telephone in bridge of the selected extension C and consequently in bridge of the calling line whereupon conversation may be held between the calling subscriber and the selected operator. At this point it may be well to mention the equipment by which the selected responsive device I is held for connection ployed ringing current generator, the right hand pair of contacts ofthe depressed key, the normally closed contacts of the remaining keys that happen to be to the right of the depressed key, the winding of relay 33, the intermediate armature switch of relay 28 and its alternate contact, the sleeve of the employed plug G, the sleeve line spring of the jack receiving this plug, the armature switch of the called line cutofi' relay 6 and its alternate contact, the lowermost armature switch of the called line switching relay 7, and its normal contact, the bell at the called station, the intermediate armature switch of said relay 7, the normal contact of this armature switch, the tip spring of the'jack L receiving the plug G, the tip of 1 this plug, the top armature switch of relay 28 and its alternate contact, the primary test tone producing coil 34:, to the grounded battery 9. Current finding path fromthe bat tery 9 through coil 34 traverses the upper grounded winding of the called subscribers cutoff relay 6 to energize this relay to attract its armature into engagement with its alternate contact to complete the sleeve side of the called line and also to open the circuit of the line relay 8 at the normal contact of the armature switch of relay 6 to'open the circuit of the called subscribers motor magnet 10 so that when the called subscriber responds he will not set his selector switch B into operation.

l/Vhen the relay 29 is energized its upper armature switch establishes a circuit by way of its right hand contact that includes the upper armature switch of relay 30 and its contact, the motor magnet 35, the interrupter 36, and the grounded battery 9. The motor magnet 35 will drive the wipers 37, 38, 39 around until the wiper 39 encounters a Waiting contact that isconnected with battery and is free of direct ground connection, this being a condition that is imposed by the operator upon a calling line extension that has become connected with the calling line and which is to be connected with the employed plug G. The means shown for placing this condition upon the waiting contact of the calling line to be engaged by the wiper 39 happens to be an operators key K.

that causes the closure of the circuit of the relay 25 momentarily. The relay 25 momentarily closes a circuit traceable from this grounded armature switch, the lower contact of this switch, the relay 4:0, to the grounded battery 9. The relay 40 establishes a locking circuit for itself traceable from the grounded battery 9, the lower armature switch of relay 40, the contact of this switch, the left hand alternate contact of the bottom armaa ture switch of the operated relay M, to ground by way of said armature switch. The upper armature switch of relay 4O establishes circuit traceable from the grounded battery 9,

contact (the battery connection thus established upon this contact being established by the operator for the purpose of arresting the wiper 39 in engagement with this Contact),

the windingof sluggishly operating relay 30, the armature switch of motor magnet 35, and ts contact, to ground. The lower arma-= ture switch of relay 30-is attracted to leave its normal contact to open thelocking cir-j cuit for the relay 29 to releaseithis relay, the upper armature switch of relay 29 opening the circuit of the motor magnet '35 as the right hand contact of this, armature switch whereby the wipers 37, 3S and 39 are permitted to remain in the positions to which they have been brought when the wiper 39 is in engagement with the waiting contact upon which battery was placed by the operator at the armature switch of relay 25. The lower armature switch of energized relay 30 establishes a circuit traceable from the grounded battery 9, this armature switch, the alternate contact of this switch, the winding of relay P to ground. The relay P established a locking circuit for itself trace-, able from its grounded winding, through the armature switch of relay 41 and its left hand contact, the resistance 42, to the grounded battery 9, the relay P having established a circuit for the relay 4C1 traceable from the grounded battery 9, the winding of relay 41, the armature switch immediately below the winding of relay P, the contact engaged by this armature switch, the wiper 38, the contact of the employed calling line ex tension engaged by this wiper, the upper intermediate armature switch of relay N,-

the alternate contact of this armature switch, the wiper 13 of the calling line, the waiting contact engaged by this wiper, theme by obvious connections over-both sides of the calling line to the intermediate armature switch of the calling line switching relay 7, the left hand alternate contact of this armature switch to said relay 7 which is grounded, the circuit thus traced being possible owing to the energization of the relay N previously traced through the wiper 39, the relay N having established a locking circuit for itself traceable from the grounded battery 9, the bottom armature switch of this relay, the contact of this armature switch, the winding of relay N, the waiting contact engaged by the wiper 39, said wiper 39, the next to the bottom armature switch of relay P, the contact of this armature switch,'to ground. The sluggish relay 41 is provided for maintaining the battery cir cuit for switching relay 7 while relays N and P are being operated. Whenrelay is energized it opens" the circuit for the associate relays 15 and 16 at neXtfto the top armature switch of relay N and the normal follow-up contact of this switchwhereupon relay 15 releases its associate magnetM to free the previously selected operators responsive device or telephone I.

The locking circuit for relay 40 is opened by the released relay M at its bottom armature switch and its left hand alternate contact whereby theselected operators equipment is restored to selectable condition with regardto another calling line. The calling subscriber will know that the called party is being signaled owing to the transmission, of ringing currentifrom the coil 34 to the coil 43, the secondary circuitbeing traceable from ground, the common battery 9, the secondary coil 43, the relay 44 (which is not energized by the"induced current), the condenser 45, the armature switch immediately below the relay P and its contact, the wiper 38, thence by obvious connections to and through the calling subscribers receiver. When the called subscriber responds he substitutes a low resistance telephone bridge for the high resistance bell" bridge permitting sufficient current to flow from the employed ringing generator through the relay 33 to energize this relay toopen the locking circuitiof the magnet 28 at the normal contact of the armatureswitch of relay 33 whereby the relay 28 is deenergized to permit its two upper armature switches to engage their normal contacts; When cir cuit through relay 33 is completed it momentarily establishes circuit at the alternate contact of this armature switch through the sluggishly operating relay 46, the armature switch of relay 46 momentarily connecting the battery 9 with the tip of the employed plug G so as to prevent faulty operation of the called subscribers cutofi relay 6. A circuit isestablished through the relay 44 traceable from the grounded battery 9, the secondary coil 43, the relay 44, the mid dle armature switch of relay P and its contact, the lower intermediate armature subscribers are through conversation they will restore their receivers upon their switch hooks and if the called subscriber, restores his receiver first relay 44 will be deenergi'zed owing to the breakage of the circuit at the called station, whereupon a momentary circuit is established traceable from the grounded battery 9, the resistance 42, the armature switch of relay 44 and its normal contact, the armature switch of sluggishly operating relay 47 and its normal follow-up contact, the alternate contact of this armature switch, the relay 32, to ground, the connections including the armature switch of relay 47 and its two contacts occurring during the release of this armature switch, circuit for the relay 47 having'previously been established by way of the right hand alternate contact of the armature switch of relay 44. A locking circuit is established for the relay 32 traceable from ground, the winding of this relay, the bottom armature switch of relay 32 and its contact, the armature switch of relay 41 and its right hand contact, the resistance 42, to the grounded battery 9. When relay 32 is energized its intermediate armature switches engage their alternate contacts to include the secondary coil 48 in bridge of the calling line, a test tone being induced inthis coil from the primary coil 49 that is included in a local circuit with an interrupter 50 whereby the calling subscriber is informed that the called subscriber has replaced his receiver upon its switch hook. The called subscriber is now placed inicontrol of his own line relay 8 owing to the deenergization of his cutoif relay 6. At this stage of the operation the talking strands leading tothe plug G are broken at the intermediate armature switches of relay 32 so as to relieve the portions of the talking strands intervening between this plug and these armature switches free of bridge connections whereby the preivously busy and now free called line may be called over a new connection, the plug G being permitted to remain in the jack of the called line. When the calling subscriber restores his receiver upon his switch hook circuit for his relay 7 and the relay 41 is opened at the alternate contact of the calling subscribers switch hook, whereupon their armature-switches are restored to normal, the wipers 12, 13 and 14 remaining in engagement with the contacts that they previously came in contact with, this being possible owing to the separation of the wipers 12, 13 and 14 from the calling line equipment at the lower armature switches of relay 7 and the armature switch of relay 10.

The wipers 12, 13 and 14 of the calling line selector switches do not, in the embodimentof the invention herein shown, restore to normal but continue to rotate in a single direction only and upon release they simplyremain in engagement with the contacts into connection. This is a very advantageous feature as the equipment of the selector switch is simplified and the wipers are enabled to continue their rotation until they engage idle waiting contacts, such rotation being continued if it should happen that all of the waiting contacts are busy and lasting until a set is free. hen the calling subscriber restores his telephone" upon his switch hook the relay 4:1 is deenergized to open the locking circuit for the relay 32 at the right hand alternate contact of the armature switch of relay ll. A circuit path for relay P is opened at the left hand contact of the armature switch of relay l1 controlled by the calling subscriber and another and remaining circuit path for this relay P is opened at the left hand alternate contact of the armature switch of relay 4A, which relay is deenergized with the called subscriber restores his receiver upon its switch hook. Relay P is thus under joint control of the calling and called subscriber when both subscribers have restored their receivers upon their switch hooks this relay P is deenergized to release its armature switches, the three upper armature switches of this relay P being restored to normal to disconnect the wipers 37, and 38 from the link at the relay P and also to disconnect the plug G from the wipers 37 and 38 and armature switches of relay P whereby the wipers 37 38 and 39 and the plug G are freed from all link connector bridges so that said plug G may remain, if desired, in the jack in which it was placed instead of being withdrawn by the operator when connection between subscribers is through.

Assuming that the desired station 190 is busy, that is that the receiver is free of its hook at this station, the plug G having been inserted in the jack'of the desired line, an operation which occurs without any testing, a depression of a ringing key K will not cause the impression of signaling current upon the line owing to the energization of the relay 27 which is energized by a circuit including the calling line and the transmitter bridge at the called station. If the desired line is in the act of being called by another operator and the telephone receiver at the station of the desired line is still upon its switch hook the relay 27 would also be energized as a consequence of a circuit traceable from the grounded battery 9, the primary winding 34: of the link connector employed by the operator previously calling the desired line, the uppermost armature switch of relay 28 of the operator already signaling the desired line, the alternate contact of the top armature switch of the relay 28 belonging to the operator first signaling the desired line, the tip of the associate plug G, the tip spring of the jack engaging this plug, to the tip spring of the jack engaged by the plug G employed by the operator second to seek the desired'line, the top armature switch of the relay 28 of this second operator, the normal follow-up contact of this armature switch, the relay 27, the upper armature switch of relay 26 to ground by way of the right hand contact of this armature. Relay 26 having previously been momentarily energized, cooperates, when thus momentarily energized, with the energized relay 27 to establish a circuit traceable from the grounded battery 9, the resistance 31, the lower armature switch of relay 29, the left hand contact of this armature switch, the lower armature switch of relay 26 the contact of this armature switch, the armature switch of relay 27 and its alternate contact, the winding of relay 32, to ground. The relay 32 now establishes a locking circuit for itself traceable from its grounded coil to its lowermost armature switch and contact, the lower armature switch of relay 29 and its right hand contact, the resistance 31, to the grounded battery 9. When the relay 29 deenergized as previously described the battery connection dropped by the lower armature switch of relay 29, is replaced at the right hand contact of the armature switch of relay 41 The interme diate arI'nature switches of relay 32 energized under the conditions just described,

causes a busy tone tobe transferred by the elements 48 and 49. The calling subscriber, upon connecting this busy tone to indicate that the desired line is busy, will restore his telephone upon its switch hook to release relays ll and 7 to restore the line equipment and the link connector equipment to idle condition. The plug G is freed from bridge connections when the relay 32 is energized so that the condition of the desired line is not modified by the equipment of an operator seeking connection therewith while a preceding operator is seeking or has secured connection therewith, the calling subscriber taking no part in this result.

WVhen the connection between subscribers has been broken the employed switchE remains in engagement with the contacts in connection with which it was previously relay P, the motor magnet R, the interrupter S and the grounded battery 9, the motor magnet R thereupon stepping the shaft Q around step by step until the wiper 50 of the left hand switch Q becomes engaged with a succeeding ungrounded. waiting contact pertaining to an idle link connector. Wiper 51 moves together with wiper 50 and establishes a circuit for the lamp 0 pertaining to the idle link connector that has become associated with the wiper 50, the similarly positioned waiting contacts of the wipers pertaining to the same link connectors, there being as many waiting contacts as there are link connectors in an operators group. If it is desired to have all the lamps O of idle link connectors lighted, switch elements 52 individual to the normal contacts of the bottom armature switches of relays P and individual to the different link connectors are brought into connection with contacts that are included in the signaling circuits, there being as many switches 52 as there are links in an operators position and all of the switches being adapted for simultaneous engagement with their contacts through the agency of a magnet 53 controlled by an operators push button T. To prevent the lamps from flashing while the wiper. 50 is stepped around the motor magnet R closes circuit through a sluggishly operating relay 54 whose right hand armature switch opens the circuit of the wiper 51. The operators are thus immediately directed to idle link connectors and will employ plugs Gwhether such plugs are in the jacks of telephone lines or upon the operators plug board.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction and circuit arrangement shown as changes may readily be made without departing from the spirit of the invention.

Having thus described my invention I claim as new and desire to secure by Letters Patent the following 1. A telephone exchange system including telephone lines extending to an exchange; link connectors at the exchange for uniting lines in conversation; calling line operated operators responsive devices at difi'erent operators positions; selector switches operable by calling lines for selecting responsive devices that are free for selection; means for holding a succeeding or second operating responsive device hunting selector switch in position to connect the same responsive device with the calling line operating such succeeding selector switch; and operator controlled means for freeing the selected responsive device from the first selector switch and bringing it into connection with the second selector switch and thereby with the calling line operating the second selector switch.

2. A telephone exchange system including telephone lines extending to an exchange; link connectors at the exchange for uniting lines in conversation; operators telephones at different operators positions; selector switches operable by calling lines for selecting operators telephones that are free for selection; means for holding a succeeding or second operating operators telephone hunting selector switch in position to connect the same operators telephone with the calling line operating such succeeding selector switch; and operator controlled means for freeing the selected operators telephone from the first selector switch and bringing it into connection with the second selector switch and thereby with the calling line operating the second selector switch.

3. A telephone exchange system including telephone lines extending to an exchange; a group of link connectors at the exchange adapted to the use of an operator for connecting calling and called lines; signal devices for the link connectors of said group and having controlling electro-magnets; and means governed by equipment of the link connectors for causing said signal devices to operate when their link connectors are idle and to energize said magnets to restore the signal devices when their link connectors are taken for use.

In witness whereof, I hereunto subscribe my name this 31st day of March, A. D., 1913.

MORTON L. JOHNSON.

lVitnesses:

G. L. CRAes, E. L. WHITE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.

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