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March 31," 1936: H. c. ‘CURL , 2,036,023 TELEPHONE SYSTEM Filed June 9, 1933 ' 1 8 Sheets-Sheet l7 FIG. / FIG. 2 FIG. 3 FIG. 4 F788 F169 FIG. 5 FIG. 6 FIG. 7 MASTER SWITCH INVENTOR H. C. CURL ‘ATTORNEY March 31, 1936. H_ c, CURL 2,036,023 TELEPHONE SYSTEM Filed June 9, 1935 8 Sheets-Sheet 2 F/G.2 237 240 242 INVENTOR H, C ~CURL A 7' TORNE V March 31, 1936. H" Q CURL 2,036,023 TELEPHONE SYSTEM Filed June 9, 1933 88heets-Sheet 3 FIG. 3 INVENTOR H. C. CURL March 31, 1936. H. c. CURL 2,036,023 TELEPHONE‘ SYSTEM Filed June 9, 1933 I—————-—————-———————————--————_—— 8 Sheets-Sheet 4 - INVENTOR Br H. C. CURL AZmIgA/EV , March 31, 1936. |-|_ q CURL 2,036,023 , TELEPHONE SYSTEM Filed June 9, 1935 8 Sheets-Sheet 5 20/ FIG. 5 202 INVENTOR . C‘. CURL Xm ATTORNEY March 31, 1936. - H. c. CURL _ 2,036,023 TELEPHONE SYSTEM Filed June 9; 1933 8 Sheets-Sheet 6 FIG. 6 INV£NTOR ' H. a; CURL ' ATTORNEY March 31, 1936. H. Q CURL 2,036,023 TELEPHONE SYSTEM Filed June 9, 1953 Br 8. Sheets-Sheet 7 INVE'N7UR h’. C. CURL ATTORNEY Patented Mar. 31, 1936 v. ‘2,036,023 UNITED‘ STATES PATENT O'FFICEj TELEPHONE SYSTEM _ Herbert G. Curl, Bayside, N. vY., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application June 9, 1933, Serial No. 675,051 5_Claims. (01. 179-1) This invention relates to announcing telephone systems and the object of the invention is to‘pro .vide such a system comprising two or more unit systems which may be operated entirely inde 5 pendently or as one complete system, as desired. ' six groups of receivers 4 to 9. The-second unit system similarly comprises station 20! and 202, an ampli?er 203 and four groups of receivers 2M tov 201. Only one receiver is ‘indicated for each group but it will be understood that any desired Heretofore there have been proposed systems _ number of loudspeaking receivers 01'' headsets or comprising a number of transmitting stations, 2. combinations thereof _may be operated in one common ampli?er and a' number of groups of group. Similarly, while only two transmitting loudspeaking receivers selectively controllable stations are shown in each system it will be obvi- ' from any one of the several stations. ous from the connections shown and described 10 below how any desiredadditional stations may be Some of these systems have been arranged'so that when ' one station is using the system all the others are added to the system. The ampli?ers 3 and 203 have been shown with . locked ‘out, but in?anv emergency any other sta tion: may cut in andobtaingjoint (orvsole) control’ ' two conventional stages primarily for the pur pose of showing the manner of interconnecting 15 of any desired receiver groups; , According to the present inventiontwo or more them for combined system operation as described of these systems are so interconnected that any‘ below. > In actual practice a number of additional transmitting station may control the' receivers 01' stagesmay be required. the other‘systems as well as its own receivers in O exactly the same manner as if the several sys tems were originally designed as a single system having one ampli?er and a number of transmit ting stations equal to the total number in the several systems. 25 More speci?cally this is accom-. plished by parallelling the several ampli?ers and providing in each unit system su?icient circuits for the operation of the total number of stations and loudspeakers in thecombined system. These interconnections are preferably arranged to be made by a single masterswitch so‘that‘ajchange 30 from unit’to system operation or viceversa can ‘be made without delay. ' v ' . A further‘ featurev of the ‘invention is vsignaling means adjacent each receiver so that the opera 35 tor may be requested to repeat the message or be advised that the message is understood. These circuits are also interconnected between systems Ordinarily, a single common battery would be provided for the entire relay control system but individual batteries have 20 been indicated wherever necessary, to simplify the wiring. Station I, which is typical of all four stations of the two systems, is equipped with a. transmitter l0, indicating lamps II and l2,-ten receiver group selective keys I3 to 22 and ten 5 corresponding receiver group indicating lamps 23 to 32.‘ The ?rst six lamps 'and keys at all sta tions are associated with the six receiver groups of the ?rst unit system'and the last four lamps 30 and keys are associated with the four receiver groups of the second unit system. A non-lock ing key 33 is'provided for extinguishing the sig nal lamps whenan announcement has been com pleted and a locking key or cut-in switch 34 35 enables the stationto cut in its transmitter while another station is using the system. _ ' ' Normal operating priority between the several to function oneither a unit or system basis. These and other features of the invention will ' stations is obtained by means of priority relays 4| , 44, 41 and 50, one for each station in the com 40 be more clearly'understood from the following bined system, the operating circuit of each relay " detailed description and the accompanying draw ings, in which: extending through the contacts on the other . ‘ Fig. _ l vis a schematic representation of the proper arrangement of the several sheets of draw 45 ings in order to show a co-ordinated system; . Figs. 2, 3, and 4 and the upper portion'of Fig. 9, taken together, show one ‘complete unit system three relays so that the operation of one relay disables the other three. Similar priority relays 241, 244, 241 and 250 are provided in the other system but for separate unit operation only the two relays in each ‘unit associated with the sta tions in that unit are operable. When the master switch ‘200 is closed the operating circuitsof cor taken together, show a second complete unit sys‘-_ responding relays are in parallel so that one pri ‘ ority relay is operated in each unit system from tem; and \ . Fig. 8 shows the master switch for combining each. station of the combined system. according to this system; . Figs. 5, 6, and 7 and the lower portion of Fig. 9, the unit system. . , _ The ?rst unit system comprises essentially two 55 transmitting stations I and 2, an ampli?er 3 and The operation of the system will be explained by ?rst describing the operation of a unit system and then by showing how the same operating fea 2 2,086,023 tures are obtained when the units- are function ing as one complete system. 7 as already pointed out, the previous operation of relay 4| has opened the operating circuit of this relay at contact 58. If the circumstances war When the Operator of station I has a message to deliver he inserts plugs 35 and 38 of his trans ‘ rant emergency action he may, however, close his mitter in the jacks 31, 38 and operates one or more of the locking keys I3 to I8 according to the number of receiver groups to be connected. He then closes the hand operated contact 38 on his transmitter to complete a circuit extending from 10 ground at the'jack 38 over conductor 48, the winding of his priority relay 4|, conductor 42, back contact 43 of priority relay 44 of station 2, conductor 45, back contact 48 of priority relay 41, conductor 48, back contact 48 of priority relay 15 58 to the grounded battery 5|. The operation of relay 4| in closing contact 52 completes a circuit for the lamp II at station I and the lamp I I I at station 2 to indicate that the system is in use. Contact 53 of the relay com pletes the operating circuits of the relays 54 and 56 from grounded battery 85 over the conductor 51. The breaking of contacts 58, 58 and 88 of relay 4| opens the return circuit leading over con cut-in switch 88, which completes a circuit ex tending from ground through the switch and con ductor 88 to the cut-in relay 88 and back to ground through the battery 8 I. The operation of the relay 8,8 prepares an operating circuit for the priority relay 44 independently of contact 58 on priority relay 4| .so that upon closing the trans mitter switch 64 the operating circuit for relay 44 extends from ground at the transmitter to the switch 64, conductor 82, winding of relay 44, to grounded battery 8|. The operation of relay 44 thereupon operates relays 88 and 81 as before and connects to the ampli?er 3 any groups of re ceivers selected at station 2 but not already con neoted to the system by station I. The operator at station 2 may then proceed to deliver his emer gency ,message. Upon the completion of his message he merely releases his transmitter switch 20 84 thereby releasing the priority relay 44 and the ductors 8|, 82 and 63 to the windings of the other priority relays 44, 41 and 58 respectively. Con-' tact 58, therefore, disables relay 44 so that sta transmitter and receiver control relays 88 and 81. The locking key 88 is also released to release relay 88 and restore the system to normal operating tion 2 can not operate it in the usual manner by condition. means of the transmitter switch 84. Conveniently located with respect to the loud The operation of relay 54 completes a circuit‘ speakers of each group is a locking key and a from the transmitter I8 over conductors 88 and non-locking key. If a message delivered to re 30 81, through the contacts on the relay to the con ceiver group 4, for example, is not understood, the ductors 88, 68 leading to the input circuit of the non-locking key 83 is closed on contact 84 to oper amplifier 3. The operation of relay 58 operates ate the signal lamp relay 85 over a circuit extend the receiver group selecting relays 18 to 15 by ing from ground, conductor 88, winding of the 35 completing at contacts 18 to 8| the circuits pre relay, conductor 81, back contact 88 of relay 88 35 viously prepared by the closing of the keys -I3 to to grounded battery. The operation of relay 85 I8 at the transmitting station. In order to obtain the same volume level irrespective of the num ber or receiver groups connected to the ampli?er, these relays 18 to 15 are equipped with substitute lights lamp 23 at the transmitting station over an obvious circuit. The key 88 is then released to load resistors suchas 82 which, when connected, introduce a loss in the system equal to the power consumed by the loudspeaking receiver group as sociated with the relay. The operation of these relays disconnects these substitute load resistors and connects the output leads 83, 84 of the ampli ?er directly to the receivers. The transmitter I8 is then connected to the receivers and the opera tor proceeds to deliver his message over the con ductors 88, 81 and 88, 88 to the input of the am pli?er 8 and from the output of the ampli?er over the conductors 83, 84 to the receivers. ‘ If station'2 desires to use the system when it is " not already in use a similar series of operations take place, that is to say the transmitter of‘ sta tion 2 is connected to vits jack and the receiver extinguish the lamp and then reclosedv to relight it repeatedly as a signal that the message has not 40 been understood. The operator will then repeat the message and when it has been understood the key IN is closed to operate relay'85 over a circuit extending from ground, the back, normally closed contact of the key 83, cond‘uctor I82, key "I, con 45 ductor 88, winding of the relay to grounded bat- ‘ tery. The operation of the relay closes contact I83 to maintain the operating circuit of the relay independently of the key I8 I. This maintains the lamp 28 lighted as an' indication that the message 50 has been understood. When the message has ' been understood by all the, receiving operators and the station operator is disconnecting his sta tion from the system as previously described for station 2, he also momentarily closes his key 88 55 at the station to operate relay 88 and open con group selecting keys corresponding to the desired ‘ tact 88 which releases relay 85 and any other sig receiver groups are operated to prepare the op nal lamp relays which have been locked up. erating circuit of' the receiver group selecting relays 18 to 15. The closing of contact 84 on the transmitter operates priority relay 44 which lights the lamps II and II I, as before, opens the operat The operation of stations MI and 282 is identi cal with the operation of stations I and 2 already described so that for unit operation of the system no detailed discussion of the circuit of the second ing circuits of the other three priority relays unit system need be given. and closes contact 88 to complete the operating‘ When it is desired-to operate the two units as circuits of relays 88 and 81. The operation of one combined system, the master switch 288 is relay 88 connects the transmitter talking circuit moved to the left to make the necessary addi to the conductors 88 and 88 leading to the input tional interconnections between the systems. of the amplifier 8 and the operation of relay 81 Many of the interconnections which do not inter- ' completes the operating circuit of the selected re fere with the normal operation of the unit system 70 _ceiver group selecting relays. If, however, the may be permanent, as, for example, the connec 70 system is already in use by station .I when the tions between the contacts of the receiver control operator at station 2 desires to make an announce relays 58. 81, 288 and 254 and between receiver ment, he is advised of ‘that fact‘ by his lamp III group indicating lamps 23 to 32 and the corre but if he ignores this lamp and closes his contact sponding lamps at the other station. The return 75 84, he can not operate his priority relay 44 since, circuit for the lamps 28 to 82 and the correspond 75 3 2,086,023 ing lamps at station 2, both of which relate to the ’ receiver group in the second unit system, extends 10' to ground through contact 2I8 of the switch 200 so that for unit operation contact 2I8 is opened and these lamps will not be lighted when the answer-back signals are being sent to stations 20I and 202. Similarly, the return circuit of the ?rst six lamps at stations 20I and 202 extend to ground through contacts 263 to prevent signals intended for stations I and 2 from appearing also at sta tions 20I.and 202. It will be noted that for unit operation the output circuit of the‘ vacuum tube I04 of the ampli?er 3 is shunted by a resistor I05 overa circuit including conductor I06, contact I01 of the switch 200, the resistor I05 and con the signal lights 29 to 32 in the station I and the corresponding lamps are now connected to ground on one side by conductor 2I9 and con nected in parallel with the corresponding lamps ~ in stations 20I and 202 by conductors 230, 230, 240 and 242, they may be operated for signal pur poses from the receiver groups 204 to 201 in the same manner as the corresponding lamps in stations 20I and 202 when these receiver groups are energizedfrom one of the stations in that unit . system. In an emergency the operator at station 2 may, by means of the switch 08, cut in his transmitter ‘in exactly the same manner as for unit operation and either station 20I or 202 may also cut in in a 15 ductor I06. Similarly, the output circuit of the similar manner. For example, the operation of vacuum tube I09 of the ampli?er 203 is shunted the switch 25I completes a circuit forcut-in bya resistor I I8 over a circuit including conductor relays 252 and I52 extending from the switch, I I6, the resistor, contact I I 3 of the switch 200, and conductor 253_to grounded battery 254 through relay 252‘ and over conductor 255, contact 256 20 20 conductor II4. When the master switch 200 is moved to the left contacts I01 and I I3 are broken - of the master switch, conductor I53 to grounded and the ampli?ers 3 and 203 are paralleled be battery I54 to relay I52. ' tween their stages over the following circuit. The operation of relay I52 completes a circuit From the plate of tube I04 over'conductor I06, for priority relay “41 independently of contact contact I I5 of the master switch, conductor I I6 to v 59 of relay 4|, extending from battery I54, wind 25 the plate of the tube I09 in the ampli?er 203. The ing and relay 41, ‘conductor I55, contact I56 of plate circuit returns are also paralleled over a the master switch, conductor 243 to ground ,circuit extending from conductor I08 in the- am through the transmitter switch 239. The opera pli?er 3, contact II1 of the master switch to con tion of relay 41 lights lamp I2 and H2 in stations 30 ductor I I4 leading to the ampli?er 203. 'Under I and 2, respectively, over a circuit extending from 30 this condition, any messages transmitted to either grounded battery I51, conductors I58 and I59. of the vacuum tubes I04 or I09 will be transmitted through the lamp to conductor 2I9 and ground to the output circuit of both the ampli?ers 3 and at the master switch. These lamps give an indi 203 to energize any of the selected groups of re ceivers in both systems. The resistors I05 and H8 are of such value that when the ampli?ers are parallelled and the resistors disconnected, transmission is not affected. . If the operator at station I now operates his 40 priority relay 4I_ to lock out station 2 in the man cation at stations I and 2 that one of the stations 20I or 202 is using the system. The operation of 35 l‘elay 252 operates relay 241 independently of the relay 24I which has already been operated by station I, over a circuit from battery 254, through the relay 241 to ground through the transmitter switch ‘ 239. In closing contact 251, relay 241 ner already described, the priority relay MI in operates relay 258 to connect‘the transmitter the other unit system will also be operated over 259 to the ampli?er 203 and relay 260 to prepare a circuit extending from conductor 40, conductor operating circuits for the selecting relays of any 208, contact 209 of the master switch, conductor desired receiver groups not already connected by 2 I0, Winding of the relay 24I, conductor 2I I, con station I. Station 201 may then proceed to de tact 2I2 of the relay 244, conductor 2I3, contact liver a message to all the selected receiver groups 2I4 of the relay 241, conductor 2I5, contact 2I6 and when ?nished disconnect his station from of the relay.250 to grounded battery 2I1. The the system as already described for station I. . operation of relay 24I opens the operating circuit When it is desired again to use the system as two of the relays 244, 241 and 250 so that stations 20I independent units it is only necessary to restore and 202 are also locked out. Station I may then the master switch to the position shown and the proceed to ‘select any or all of the ?rst six loud combined system is immediately reconverted to speaker groups associated with'his system and, 7 two independent systems with their original oper in addition, one or more of the four groups asso- j ating featuresr ciated wtih the other unit system. For example, ‘he may close all ten keys I3 to 22. The receiver groups 4 to 9 will be selected in the manner already described and in addition the closing of keys I9 to 22 ,will select the receiver 60 groups 204 to 201 in the following manner: A circuit is made from ground at the master switch . It will be seen from the foregoing description 55 that for unit operation lamps II. and-III are lighted when either station I or 2 is operating and lamps 245 and 248 are lighted when either.‘ station 20I or 202 is operating. For the com bined system operation, lamps II, III, 246 and 60 249 are lighted when either station I or 2- is through contact 2I8, conductor 266, keys I9 to ' operating, and lamps I2, H2, 245 and 248‘ are 22 over all four conductors 2I9 to 222, through the upper four contacts of the relay 56 which has ‘lighted when either station 20I or 202 is oper 65 already been operated to conductors 223 to 2.26 system is operating, both lamps at all four sta ating’. When one or more stations of each unit 65 and conductors 221 to 230 toggrounded batteries ' tions will be lighted. If, for example, the operator through the relays 23I to 234. The operation at station I ?nds his‘lamp II lighted, it is an of these relays disconnects the substitute load indication that station 2 is already operating; if resistors and connects the loudspeaker groups 204 lamp I2 is lighted, he knows that one of the 7.0 to 201, through the conductors 235 and 236 to stations'of the other unit is using the combined 70 the output circuit of the ampli?er 203. By virtue system and if both lampsare lighted, he knows of the parallel connection between the ampli?ers that both station 2 and one of the stations in the other units are using the combined system. While-the invention has been described with these receiver groups will then be energized by messages sent from station I simultaneously with 75 the receiver group in the ?rst unit system. Since reference to a. particular circuit for purposes of 75 2,036,023 4 illustration, it will be understood that various changes may be made within the scope of the following claims. What is claimed is: _ 1. In an announcing system the combination with at least two normally independent unit sys tems each including a plurality of transmitting stations, an ampli?er, a plurality of receivers, means at each of the stations for connecting the stations and the receivers to the ampli?er, means operated when one of the stations is so connect ed for disabling the other station, and emergency means at each station operable while,the station is disabled for connecting it to the ampli?er, of 15 cross connections between the unit systems and a switch therein for effectively combining the unit systems into a single system in which each transmitting station may control all the receiv ers in the same manner as it controls the re 20 ceivers in the corresponding system when operat ing as an independent unit. 2. In an announcing system the-combination with at least two normally independent unit sys tems each including a plurality of transmitting 25 stations, a priority relay in each system for each station in all the unit_systems, an operating cir cuit therefor, an ampli?er, a' plurality of re ceivers, a receiver-control relay for each receiver in all the unit systems, an operating circuit there 30 for, means at each station for operating the cor responding priority and receiver-control relays 3. In an announcing‘ system the combination with a plurality of transmitting stations, an ampli?er, a plurality of receivers, and means at the stations for selectively connecting the re ceivers and the stations to the ampli?er, of a plurality of indicators at the stations, means at each receiver for operating an indicator at each station, and means at each station for resetting operated indicators. 4. In an announcing system, the combination 10 with at least two normally independent unit sys tems each including a plurality of transmitting stations, an ampli?er, a plurality of receit .;1'S, means at each of the stations for connecting the stations and the receivers to the ampli?er, and van impedance normally connected in shunt to the ampli?er, of cross connections between the unit systems, _a switch therein for e?ectively combining the unit systems into a single system, and contacts on the switch for paralleling the 20 ampli?ers and disconnecting said impedance. 5. An announcing telephone system compris ing at least two normally independent unit sys tems each including a plurality of transmitting stations and a plurality of receiver circuits se in each unit system for each station of all the unit systems, an operating circuit for each relay extending through the contacts of each of the other relays of the unit system, and controllable 30 from the corresponding station, means respon sive to each priority relay for completing a talk ing circuit between a transmitting station and selected receiver circuit, and means for combin said priority relays for opening the operating cir 35 cuits of the other priority relays, of cross connec ing the unit systems into a single system com tions between the unit systems and a switch‘ prising a switch and contacts thereon paralleling of said unit systems to connect the stations and the receivers to the ampli?er, and contacts on therein for paralleling the ampli?ers and the operating circuits ‘of the corresponding priority and receiver-control relays of the several systems. 25 lectively controllable therefrom, a priority relay the talking circuit and the corresponding priority relay of the unit systems. HERBERT C. CURL.