US1615280A - Automatic telephone system - Google Patents
Automatic telephone system Download PDFInfo
- Publication number
- US1615280A US1615280A US282443A US28244319A US1615280A US 1615280 A US1615280 A US 1615280A US 282443 A US282443 A US 282443A US 28244319 A US28244319 A US 28244319A US 1615280 A US1615280 A US 1615280A
- Authority
- US
- United States
- Prior art keywords
- wiper
- relay
- switch
- springs
- trunks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
Definitions
- My invention relates in general to automatic telephone systems and more specifically to an improved method of controlling certain of the switches in such a systenm
- a switch has been used in the past which has so called group selecting as well as trunk selecting functions, that is, one group of trunks from a switch may consist of 20 or 30 trunks and may take up two' or three levels in the switch.
- the switch may thus select automatically a trunk in any of the levels assigned to the group by a vertical and rotary trunk selecting movement.
- such a switch has always operated to rotate past-busy levels in case all trunks are busy and rotate past all the trunks in the last level of the group to give a busy signal by closing a pair of cam springs on theeleventh rotary step.
- the object of my invention is therefore to do away with the necessity of releasing the connection when all the trunks are busy and to so arrange the operation of the switch that when all the trunks in a multi level group are busy, the switch Will stop at its first vertical step leading to that group and will then give a busy signal'to the operator.
- the operator may in this manner set up the call and leave it until a trunk goes idle, at which time the switch will automatically step up and rotate or rotate only, depending upon the location of the idle trunk, and pick out that idle trunk.
- the switch operates in its regular manner and must be released it all the trunksare busy.
- V Fig 1 shows a substation A, having access through a line switch 0 to a special combination switch embodying my invention. This switch is also accessible to a toll selector of anyapproved type such as shown in Fig. 3 when the call is from-an operator in the main exchange.
- Fig. 2 v shows one arrangement of the pri vate bank and its cooperating wipers of the switch H showing three levels of trunks in l one group.
- a toll selector switch such as may be. used by operator in follows: Subscriber A upon removing his receiver to-initiate a call, closes a circuit in the usual manner for the line relay 2 of the line switch Gin series with the line circuit Relay 2 u on operating closes a circuit for relay 3 an ashort circuit around relay 3 to the private magnet 4 in series and also closes wipen; Now if the private contact of a trunk is grounded as a" result of its beingin' use, the magnet 4 will operate over this short circuitand step, the wipers on until an idle trunk is reached.- At this time relay 3 being no longer short eircuited will energize and cut the line throu h to the line re.- lay 5 of the switch lvfignet a does not energize in series with the relay 3.
- the line relay 5 energizes and closes'a circuit for the slow relay 6 which in turn energizes to prepare thecircuit of the vertical magnet 7, to ground the holding trunk back to the line switch G, andt'o place ground on the multiple in the bank of the toll selectors through relay 62. ;Now when the calling.
- the line relay 5 responds thereto and closesa circuit" v for the vertical magnet. 7' extending from ground through springs 8 and 9, spr1hgs 1O and ma et? to lampr Each time the magnet operates the wipers of the switch are raised one ste to alevel of bank contacts: It may be nector H has a plurality-ofwipers, namely,
- Fig. 2 I have shown the first 3 levels as forming a group by itself and the next 2 levels may form another 'roup by themselves. Now if the firstdlgit is one the magnet 7 will step all the wipers to the first level of contacts with the Wiper 15 in engagement with the first or lower contact 16.
- Relay 24 energizes and closes a new circuit for itself from springs 25 through springs 31, springs 32 of the vertical magnet 7, springs 33 of rotary magnet 34, and through oil normal springs 30 to relay 24 and battery. Relay 24 also closes the springs 35 which prepare a circuit for the rotary magnet 34:. r
- Magnet 7 now operates to step all the wipers to the second level of the group and opens the circuit of relay 24. at springs 32.
- the said springs 32 remove a short circuit from a high resistance lower winding of relay 37 to maintain said relay energized as Wiper 15 passes to the next contact but relay 24 falls back and again opens the circuit of magnet 7 at sprin s 35.
- relay 37 remains energized after magnet 7 de-energizes and again closes contact 32, relay 2 1 is again energized, this time over a new circuit through the upper springs of relay 37, and the alternate action continues until the wiper 15 meets a nongrounded contact 16 which in this case will be the third vertical contact.
- relays 36 and 37 will no longer be energized, although relay 37 is rendered slightly slowncting by the closure of springs 32 .on the last de-energization of magnet 7 and holds up long enough to enable relay 24: to energize once more. fhis does not re-operate magnet 7, however, be cause relay 37, on deenergizing, opens the circuit of the vertical magnet and closes the circuit of rotary magnet 3% from ground through springs 25, springs 26 and 27, springs 28 and 45, springs 35, springs 4:3 and 42, and rotary magnet 34: to battery. Magnet 34; will now energize to break the circuit of relay 2 1-- and to step the wipers into engagement with the first set of con tacts in the upper level of the group.
- relay 23 will be energized to connect ground through a resistance on the first contact 16, but relay 40 will not be energized and therefore there will be no ground presout on thesecond contact 16.
- the switch ll will therefore be operated in the usual manner as pointed out in connection with the previous call and when wiper 15 meets the first contact 16 which is grounded through resistance 39 the relay 37 will energize but relay 36 will not.
- the vertical magnet 7 will again be operated to step the wipers to the second level of the group as before.
- Relay 47 energizes to cut the talking circuit through to the Wipers 19 and 20 and is held energized by a circuit from springs 25 and ground, through relay 47, springs 32, springs 33-, springs 30 and winding of relay 24 to battery.
- vRelay 17 connects ground direct to wiper 17 to make the called line busy, and opens the circuit of the magnet 7 at springs 13.
- this selector E Fig. 3 When this selector E Fig. 3 is seized it is operated through the medium of the line relay 76 which controls the vertical and rotary magnets 77 and 78 to step the wipers into engagement with the contactssuch as 63,6 1, and 66 leading to the connector H (Fig. 1). As soon as the switch H is seized, the relay 79 of switch E energizes to connect the bridged relay 98 across the talking circuit and to close a circuit through resistance 75, springs 74 and 73, springs 72 and 71, wiper 70, contact 6 1, relay 62, to the spring of relay 6 of switch H. Also an opcircuit isclosed from ground through springs 81 and 82 of the line relay 76 of switch E, springs 83 and 84, wiper 85.
- Relay 5 of course energizes and operates relay 6, to connect ground tothe above traced circuit through the relay 62 and the resistance of the selector E.
- relays 62 and 67 enis a type of switchcrgize, the springs 88 are opened around the resistance 86, springs 58 and. 87 are closed, the springs 88 are closed to hold rclay67 energized and the springs 52 and 53 are opened in the ringing circuit.
- relay 76 of the selector E operates and in turn controls relay 5 of switch H to in turnoperate the magnet 7 as in a local call to step the wipers 15, 17, 18, 19' and 20 to a level of. the banks or to the first level of a roup of levels such as shown in Fig. 2 in which it is desired to. select an idle trunk or called line.
- Relay 62 decnergizes to connect the ringing circuit through contacts 52 and 53, 541 and to and through the ringer oi the called line, back through Wiper 19, springs 50, springs 56 and 57, springs 58 and 87, contact 65, springs 93, springs 94 and 95, and slow relay 96 to but tery. swcrs, relay 96 energizes to open the locking circuit of relay 91 atsprings 97. Finlay.
- Both springs 38 and 14 being open and resistance 86 being high enough to prevent the operation of magnet 7, then the switch will stop at this point.
- Relay 36 upon energizing closes the springs 100 to connect a busy tone to a conductor of the talking circuit. The operator upon hearing this signal knows that all the lines are busy to this group of telephones but instead of releasing the connection she will simply leave it set up and wait until one of the lines becomes idle. When any line in this group becomes idle the circuit of the relay corresponding to its level is opened and therefore the chain conncctii'ig ground to the first contact 16 is broken.
- relay 4() will dcencrgizc, thus breaking the direct ground connection and leaving ground through resistance 35) connected to the first contact 16.
- the relay 3t will deencrgize but relay 3? will remain energized.
- h' 'n'ings 14; of relay 36 now close contact to short out the resistance 86 in series with the vertical magnet and magnet 7 will therefore operate to step the wipers to the second level and to the second contact 16, which is open at this time.
- Relay 37 will now deenergize also and open the circuit of magnet 7 and close the circuit of magnet 34 which as before will cause the wipers to rotate in Search of the idle trunk.
- a calling subscriber must alwayshang up his receiver and call again when he receives a busy signal but an operator may leave a connection set up when a busy signal is received and the connection will be automatically completed when a line becomes idle.
- a trunk seleetinz switch havinga wiper and trunk lines accessible thereto divided into groups, said wiper having a primary motion to pick out a group and a secondary motion to select an idle trunk in a group, means for stopping the movement of the wiper after it has completed the primary movement and before the secondary movement has started when all of the trunks in the selected group are busy, and means for causing said wiper to operate both in its primary and secondarymovements to move into engagement with a trunk as soon as one becomes idle.
- a trunk selecting switch having wipers and trunk lines accessible thereto divided into groups and subgroups, means for moving said wipers opposite a group of trunks but out of engagement therewith, means for making all of the trunks busy, means for preventing further operation of the wipers when all the trunks are busy untila trunk in one of the subgroups becomes idle, and means for the bringing said wipers first opposite the subgroup in which there is an idle trunk and then into engagcn'ient with said idle. trunk.
- a trunk selecting switch having a wiper and trunk lines accessible thereto divided into groups and subgroups, a test contact for each trunk line, a test contact for each subgroup of trunks, the test contact of one subgroup also serving as a test contact for the group, means for making the trunks busy, means for moving said wiper into engagement with the test contact of a group and means for preventing further operation oi the switch it all the trunks are busy.
- a trunk selecting switch having a, wiper and trunk lines accessible thereto divided into groups and subgroups, a test contact for each trunk line a test contact for each subgroup of trunks, the test contact of out-subgroup also serving as a test contact for the group, means for making the trunks busy, means for moving said wiper into engagement with the test contact of a group and means for moving said wiper into engagement with the test contact of another subgroup it only the trunks in the first subgroup are busy.
- a trunk selecting switch having line and test wipers and trunk lines accessible to said wipers each having a test contact.
- said trunk lines divided into groups and subgroups with a test contact'for each subgroup one of which acts as test contact for the group, means for moving the wipers until the test wiper engages the test contact of a group, means for stopping the switch at this time it all the trunks in all the subgroups of this group are busy and means for moving the wipers to the test contact of another subgroup in the group of trunk lines and then rotate and connect to an idle trunk in the selected idle group, and means made operative if all trunks are busy to prevent the said automatic vertical motion.
- a switch having a wiper, a group of trunks divided into subgroups accessible to said wiper, said wiper having primary and secondary movements, direetively.
- controlled means for operating said wiper in its primary movement to pick out a subgroup. of trunks means operable thereafter in case said subgroup of trunks is busy for operating said wiper automatically in its primary movement to pick another of said subgroups, meansoperable after an idle subgroup is found for operating said Wiper in its secondary movement to bring it into engagement with an idle trunk, and means operable when all of said trunks are busy for preventing the said automatic primary movement of said wiper.
- a switch having a wiper, a group of trunks divided into subgroups accessible to said wiper,'said wiper having primary and secondary movements, direet-ively controlled means for operating said wiper in its primary movement to pick out a subgroup of trunks, means operable thereafter in case said subgroup of trunks is busy for operating said wiper automatically in its primary movement topick another of said subgroups, means operable after an idle subgroup is found for operating said wiper in its secondary movement to bring it into engagement with an idle trunk, and means operable when all of said trunks are busy for preventing the said automatic primary movement of said wiper until after one of said trunks has become idle.
- a switch having awiper, a group of trunks divided into subgroups accessible to said wiper, said wiper having rimary and secondary movements, means or operating said wiper in its primary movement to pick out a subgroup of trunks, means operable thereafter in case said subgroup of trunks is busy for operatmg said wiper automatically in its primary movement to pick anotherof said subgroups, means operable after an idle subgroup is found for operating said wiper in its secondary movement to bring it into engagement with an idle trunk, and means operable when all of said trunks are busy for preventing the said automatic primary movement ofsaid wiper until'after one of said trunks has become idle.
- a'telephone systeima switch having a wiper, a group of trunks divided into subgroups accessible to said wiper, said wiper having primary and secondary movements, directively controlled means for operating said wiper in its priniar 1 movement to pick out a subgroup of trun s, means operable thereafter in case said subgroup oftrunks is busy for operating said wiper automatically in its primary movement to pick another of said subgroups, means operable after. an idle subgroup is found for operating said wiper in its secondary movement to bring it into engagement with an idle-trunk, and means operable in case all of said trunks are busy for maintaining said switch in condition tobring said Wiper into engagement with any one of said trunks. after it becomes idle.
- a switch havin a wiper, a group-of trunks divided into su groups accessible .to said wiper, said wiper having rimary and secondary movements, means or operatin said wiper in its primary movement to icl i out-a subgroup of trunks, means opera is thereafter in case said subgroup of trunks is busy for operating said wiper automatically in its primary movement to pick another of said subgroups, means operable after an idle subgroup is found for operating said wiper in its secondary movement to bring it into engagement with an idle trunk, and means operable in case all of said trunks are busy for main taining said'switeh in condition to bring said wiper into engagement with any one of said trunks after it becomes idle.
- a switch having a wiper, a group of trunks divided into subgroups accessible to said wiper, said wiper having primary and secondary movements, means for operating said wiper in its primary movement to pick out a subgroup of trunks, means operable thereafter in case said subgroup of trunks is busy for operat ing said Wiper automatically in its rimary movement to pick another of said su groups means operable after an idle subgroup is found for operating said wiper in its secondary movement to bring it into engagement with an idle trunk, and meansoperable in case all of said trunks are busy for testing them continuously.
- a switch having a wiper. a group of trunks divided into sub groups accessible to said wiper, said wiper having primary and secondary movements,
- said switch having a wiper, a group of trunks divided into subgroups accessible to said wiper, said wiper having primary and secondary movements, means for operating said wiper in its primary movement to pick out a subgroup of trunks, means operable thereafter in case said subgroup of trunks is busy for operating said wiper'automatically in its primary movement to pick out another of said subgroups, means operable when the primary movement is completed for operating said wiper in its secondary movement to bring it into engagement with an idle trunk, means operable in case all of said trunks are busy for preventing any further movement of said wiper after the first said primary movement is completed in case said switch has been seized by way of a'particular one g ot" said paths, and means "for rendering said 40 last means inoperative in case the switch has been seized by way of
- a switch In a telephone system, a switch, a group of trunks accessible thereto divided into subgroups, a test contact for each trunk and a test contact for each subgroup, the test contact of one subgroup serving also as the test contact for the group, means for placing a certain busy potential on said 0 group test contact when the associated subgroup is busy, and means for placing a different busy otential on said group test contact when tiie group is busy.
- an automatic trunk selecting switch having both directive and automatic primovement, means for automatically and successively starting the automatic movements of said switch upon completion of the direc tire movement. and means ctt'cctive contingcnt upon the busy condition of trunk lines accessible to said switch for preventing both automatic movements.
- an automatic trunk selecting switch having both directive and automatic primary movements and an automatic secondary movement, means for automatically starting the automatic primary movement of said switch responsive to the completion of the directive movement, means for automatically starting the secondary movementof said switch upon completion of the automatic primary movment, and means ettective contingent upon the busy condition of trunk lines accessible to said switch for rendering the said first starting'means ineffective.
- an automatic trunk selecting switch having both directive and automatic primary movements and an automatic secondary movement, a group of trunk terminals selectable by a predetermined directive primary movement, means for automatically and successively starting the automatic movements of said switch upon-completion of the directive movement, means effective in case all said terminals are busy when the group is selected for preventing any automatic movement of. said switch, and means for startin the automatic movements to select an idle trunk terminal as soon as one becomes available.
- a combination toll and local connector means for operating the switch in a directive primary movement and in automatic primary and secondary movements to select a trunk line by group, sub-group, and individual selecting operations, respectively, and means efl'ective in case said switch is in use as a toll connector for holding the same in a state of suspended operation at the end of its directive primary movement provided the group of trunks selected in such primary movement is busy.
- AVAEL select a. trunk line by group, subgrt'iup, and individual selectingoperations, respectively, means ellertivc in (use said switch is in use as a, toll connector for holding the some in a state of suspended operation at the end of its directive primary movel'ncut provided the group of trunks selected in. such primary movement is busy, and means for automati- (filly continuing the operation-of the switch to select a sub-group and a trunk in such suh-group as soon as a sub-group is available containing an idle trunk.
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- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US282443A US1615280A (en) | 1919-03-13 | 1919-03-13 | Automatic telephone system |
| FR511492A FR511492A (fr) | 1919-03-13 | 1920-03-12 | Perfectionnements aux systèmes téléphoniques automatiques |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US282443A US1615280A (en) | 1919-03-13 | 1919-03-13 | Automatic telephone system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1615280A true US1615280A (en) | 1927-01-25 |
Family
ID=23081542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US282443A Expired - Lifetime US1615280A (en) | 1919-03-13 | 1919-03-13 | Automatic telephone system |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1615280A (fr) |
| FR (1) | FR511492A (fr) |
-
1919
- 1919-03-13 US US282443A patent/US1615280A/en not_active Expired - Lifetime
-
1920
- 1920-03-12 FR FR511492A patent/FR511492A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR511492A (fr) | 1920-12-27 |
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