US2652454A - Rotary connector switch - Google Patents

Rotary connector switch Download PDF

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Publication number
US2652454A
US2652454A US129599A US12959949A US2652454A US 2652454 A US2652454 A US 2652454A US 129599 A US129599 A US 129599A US 12959949 A US12959949 A US 12959949A US 2652454 A US2652454 A US 2652454A
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United States
Prior art keywords
relay
contacts
circuit
series
test
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Expired - Lifetime
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US129599A
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English (en)
Inventor
Morris E Griffins
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Automatic Electric Laboratories Inc
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Automatic Electric Laboratories Inc
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Filing date
Publication date
Priority to BE499228D priority Critical patent/BE499228A/xx
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Priority to US129599A priority patent/US2652454A/en
Priority to GB25048/50A priority patent/GB683339A/en
Application granted granted Critical
Publication of US2652454A publication Critical patent/US2652454A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • the present invention relates in general to automatic telephone systems, and its object, broadly stated, is to provide a new and improved circuit arrangement for the type of switches known as the rotary connectors.
  • Another object is to provide improved service facilities.
  • a feature of the present invention is the reduction in cost of this type of connector by requiring fewer relays and bank contacts by providing circuits such that certain relays perform functions which heretofore have been accomplished by single relays.
  • the present invention discloses a rotary connector switch providing for the establishment of connections to the first idle line of a group of private branch exchange lines or trunk lines which are allotted the same number in the telephone directory.
  • the first digit of the three digit rotary connector operates the switch vertically.
  • the second digit operates the switch in a rotary motion to a trunk in a group of trunks, and the first impulse of the third digit operates the busy relay to close the circuit to the rotary magnet so that the remaining pulses of the third digit operate the rotary magnet in case the busy relay is held energized by busy lines.
  • the busy relay releases to operate the switching relay, which in turn opens the rotary pulsing circuit and the connection is made to the idle line.
  • the third digit can be any number up to the O and will depend upon the number of trunks in the group.
  • the third, digit is assigned in accordance to the number of trunks in a group, for example 1 for a single trunk, digit 2 for two trunks etc. If all trunks in the group are busy, the busy tone is returned to the calling party when the connector comes to rest on the line representing the last line of the third digit dialled.
  • the first two digits select the desired line and the digit 1 is used as the third digit, since the first pulse is absorbed in the busy relay so that the rotary magnet does not step on the first pulse of the third digit.
  • This circuit arrangement permits the use of a 300 point bank instead of the usual 400 point bank and reduces the number of relays required in this type of connector.
  • the accompanying drawing shows a three-digit combination rotary connector.
  • the connector is of the well-known vertical and rotary Strowger type switch. Three hundred bank contacts are required for this connector; three contacts for each line, and are of the type well-known in the art.
  • Substation A represents one of a plurality of subscribers and is connected to the connector by a line circuit I90, which is also well-known in the art.
  • substation A which is one of a plurality of substations accessible to the group of bank contacts designated first group in the upper right hand corner of the drawing.
  • this connector In response to the establishment of a call from a calling subscriber over a preceding switch train, not shown, in a well-known manner, this connector is seized from the immediate preceded switch normally a selector circuit, in a well-known manner over the line conductors 93 and 94 and the control conductor 92.
  • line relayv I0 is operated over the calling line loop through conductors 93 and 94.
  • the preceding switch train placing a ground connection on conductor 92.
  • Relay l0 operated and contacts ll make to operate release relay 20.
  • transfer relay 30 operated over the following path: conductor 92, V. O. N. contacts 3, relay 39 and battery.
  • Contacts 34 make to prepare the circuit for the pulsing of vertical magnet l.
  • Contacts 33 prepare a locking circuit for relay 30.
  • Contacts 32 prepare the circuit for the operation of switching relay 69.
  • Relay 20 operates and contacts 2
  • Contacts 24 make to put ground on conductor 92, busying the connection from seizure from other calls during the time it is held by the calling party and holding the preceding switches in the train operated and busying them.
  • Contacts 25 make to prepare locking circuits for busy and testing relay 50, ring cut-off relay l0, and switching relay 69.
  • Contacts 23 open the circuit to the release magnet 5.
  • the connector is now prepared to receive the impulses transmitted as a result of the dialing of the first digit.
  • the circuit to line relay I is intermittently interrupted in response to the operation of the calling device, not shown, by the calling subscriber.
  • the intermittent operation of relay I0 pulses the vertical magnet over the following path: ground, back contacts I2, contacts 2
  • V. O. N. spring contacts 3 break to open the initial operating circuit of transfer relay 30 and contacts 2 prepare the circuit to release magnet 5'. Relay 3!] being slow-to-release. relay remains operated until the completion of the first series of impulses dialled by the first digit over the following path: ground, contacts I2, contacts 2 I, contacts 66, contacts 34, relay and battery.
  • the wipers 6, I, 8, and 9 are now resting opposite the third level of bank contacts.
  • ! releases after an interval and contacts prepare the circuit for pulsing the rotary magn t; contacts 3
  • the connector is. now prepared for the dialing of the second digit.
  • the calling subscriber now manipulates the calling device, not. shown, in accordance with the second digit of the directory number.
  • the circuit to the line relay I0 is intermittently interrupted to pulse the rotary magnet 4 over the following path: ground, back contacts I2, contacts 2
  • the operation of the rotary magnet 4 steps the wipers into engagement with the bank contact corresponding to the second dialled digit, or in thisexample the first bank contact in the third level.
  • Series relay operates and contacts 42 make before contacts 43 break.
  • the remaining pulses of the second digit if more than the digit one, will operate the rotary magnet 4 over the following path: ground, back contacts I2, contacts 2
  • the wipers 6, I, 8 and 9 are now resting on the first bank contact of the first group.
  • the calling subscriber now dials his third digit which is 5.
  • the first trunk line in this group terminating; in bank contact 20I is idle.
  • the first pulse of the third digit interrupts the line relay Ill and the busy and test relay 50 absorbs the first pulse and operates over the following path: ground, contacts I2, contacts 2
  • Relay 50 operates and contacts 5
  • contacts 54 complete a locking circuit for relay 50; contacts 52 complete a testing circuit from bank contact 20
  • Relay 60 operates over the following path; battery on contact 20I, wiper I and 8, contacts 53,, relay 60., contacts 32, contacts 25, and ground.
  • start the ringing machine over an obvious circuit.
  • Contacts 62 send a ring back tone over the following path to the calling party: conductor 9I,v C3, contacts 82, contact I5, CI and Contacts 63 and 61, prepare thev ringing circuit to the called subscriber's line.
  • Contacts 65 complete a locking circuit for relay 60.
  • Contacts 64 operate B. C. O. relay, not shown, in the line circuit IOIJ. and guards the called line from intrusion in a well-known manner.
  • relay 60 opens the pulsing circuit to rotar magnet 4 so that the remaining impulses of the third digit are ineffective to operate the switch. Therefore, in case the first trunk line in the called group is idle the connector switches through and the remaining impulses of the third digit are absorbed.
  • switching relay 60 at contacts 63 and 61 completed the circuit for ringing the called subscriber, such as A, as follows: from battery connected interrupted generator, upper winding of ring cut-off relay I0, contacts I4 and 63, wiper 6, bank contact IOI over the talking conductors in the line circuit I00 to called line A back to bank contact 30I, wiper 9, and contacts 61 and I9 to ground.
  • Relay 10 operates over the following path when the called subscriber removes his handset to answer the call: battery connected interrupted generator, relay I0, contacts I4, contacts 63, wiper 6, contact IDI, line circuit I00, the called line loop, contact 3', wiper 9, contacts 61 and ground on contacts I9.
  • Contacts I3 and I9 make to prepare the talking circuit from the calling subscriber to the called subscriber A.
  • Contacts I5 break removing ring back tone.
  • Contacts I6 completes a locking circuit for relay 10 over the following path: battery, relay 10, contacts 16, contacts 3
  • Back bridge relay operates over the following path: battery, relay 80., contacts 73, contacts 63, wiper 6, contact IllI, over the talking, circuit through the line circuit and called line, contact 301, wiper 8, contact 6?, armature I9, relay 80 and ground.
  • the remainin pulses were ineffectual for stepping rotary magnet 4 since relay 58 released if the wipers 7 and 8 were on an idle line.
  • ] operated relay 60 which opened the pulsing circuit to the rotary magnet 4 at contacts 66.
  • Relay 30 operates over the following path when line relay energizes after the termination of the first pulse: ground, contact ll, contacts 55, contacts 11, upper Winding of relay 30 and battery. Contacts 3
  • the second pulse of the third digit now operates rotary magnet 4 which steps the wipers to the second contact of the firstgrou of contacts over the following path: ground, contacts l2, contacts 2
  • Relay due to its slow to release characteristics remains operated after release of relay 10 over the pulsing circuit.
  • a similar operation continueswith each pulse until an idle line is found or until the termination of a series of pulses'controlled by the third digit. Let us assume further that all lines in the called group are busy and wipers 6, l, 8
  • relay 50 With the fifth contact busy, relay 50 is operated. Relay 30, the slow-to-release relay, remains operated until the third series of pulses terminate. When relay 39 operates, relay 10 releases and busy tone is transmitted to the calling party. If the fifth contact is idle or any contact preceding the fifth contact is idle, the relay 5! releases in a manner similar to that previously described when contact 285 was idle and the call is switched through and the called subscriber is rung.
  • Relay 80 releases and contacts 82 break thereby releasing relays 60 and 10 over a path previously described for locking the same.
  • Contacts 83 complete the circuit for the operation of release magnet 5 over the following path: release ground conductor, contacts 83, contacts 23, V. O. N. contacts 2, release magnet 5 and battery. Release magnet 5 releases the connector which at off-normal contacts 2 opens the release magnet circuit irra manner well-known in the art.
  • Relay BB releases and contacts 6! open the ring machine circuit; contacts 63 and 67 open the talking circuit; contacts 64 remove a ground connection from 2D! to remove the busy marking from the line of subscriber A and to release the B. C. O. relay in line circuit H30; and contacts 66 again prepares the pulsing circuits.
  • Relay l0 releases and the system is now prepared for future operation.
  • the first digit dialled corresponds to the level in which the called line is located
  • the second digit corresponds to the terminal bank contacts in which the called line terminates
  • the third digit dialled is digit one to operate the busy relay for the purposes of testing the engaged line.
  • the bank terminal number of the desired line is dialled for the second digit and the digit 17' is used as the third digit, and the operation is similar in all respects as was described for calling an individual line.
  • the first digit dialled is digit 3 to operate the switch wipers vertically to the third level
  • the second digit dialled is digit 6 to rotate the wipers to the 6th bank contact in the third level
  • the third digit dialled is digit 3 to cause the wipers to rotate to the 8th bank contact in the case the 6th and 7th test contacts are grounded (due to these linesbeing. busy) in a manner similar to that described for the first trunk group.
  • an automatic switch having wipers and means for receiving a series of impulses, a magnet for rotating said wipers, a line relay in the switch operated by said series of impulses, a circuit for said magnet, a series relay connected in series in said circuit, means to control said circuit to cause the operation of said series relay and the operation of said magnet to rotate the wipers, means whereby said last means is controlled by the operation of said li e relay when operate by s id se es of impulses, a ring cu -01f r la a cir i o p lyi-ng ringing current to a called line, means whereby said last mentioned circuit is controlled by the operation of said ring cut-off relay, means for completing the circuit of said ring cut-off relay to disable the ringing circuit controlled thereby, means whereby said last means is controlled by the operation of said series relay when operated by said impulses.
  • a circuit over which the switch may be seized and over which a plurality of series of digital impulses are received a plurality of bankcontacts arranged in levels and in groups therein, said contacts when idle having one potential connected thereto and when busy having a different potential connected thereto, a test relay, a test wiper for connecting test relay to any of said contacts, means for stepping said wiper to select a level of said bank contacts, means whereby said last means is operated in response to the receipt of the first series of received digital impulses, a second means for stepping said wiper to select the first contact of said group of contacts, means whereby said last means is operated in response to the receipt of the second series of received digital impulses, an operating circuit for said test relay, a series relay, means for operating and releasing said series relay, means whereby said last means is operated by said second series of received impulses, means for preparing said test relay operating circuit, means whereby said last means is controlled by the operation of said series relay, other means for further preparing said test relay operating
  • a test relay a test circuit including a wiper for connecting said test relay to said bank contacts, a circuit over which said switch is seized and over which impulses corresponding to a plurality of digits are received for operating said switch, a primary and a secondary operating means in said switch, control means in said switch operated in response to said received impulses, a transfer relay, means for operating said transfer relay, means whereby said last means is operated in response to the seizure of said switch, means for causing said control means to have control over said primary operating means, means whereby said last means is controlled by the operation of said transfer relay, means for operating said primary operating means to direct said wiper onto a level of said bank contacts, means whereby said last means is actuated by said control means when operated by the first series of received impulses, means to release said transfer relay, means whereby said last means is operated by said control means
  • a circuit over which the switch may be seized and over which a plurality of series of digital impulses are received a plurality of test bank contacts arranged in levels and in groups, a testrelay, a test circuit including a wiper for connecting said test relay to said bank contacts, a first means for stepping said wiper to select a level of said bank contacts, a second means for stepping said wiper to select a contact in said group of contacts, a test relay, means for operating said first stepping means, means whereby said last means is operated in response to the first series of digital impulses, means for operating said second stepping means, meanswhereby said last means is operated in response to the receipt of the second series of impulses, means for operating said test relay, means whereby said last means is operated by the first impulse of subsequent series of impulses, means for completing said test circuit, and means whereby said last means is controlled by the operation of said test relay.
  • a circuit over which the switch may be seized and over which a plurality of series of digital impulses ar received a plurality of test bank contacts arranged in levels and in groups, said contacts when idle having one potential connected thereto and whenbusy having a different potential connected thereto, a test relay, a test circuit including a wiper for connecting said test relay to said contacts, means for stepping said wiper to select a level of said bank contacts, means whereby said last means is operated in response to the first series of received digital impulses, a second means for stepping said wiper to select a contact of said'g'roups of contacts, means whereby said last means is operated in response to the second series of received digital impulses, an operating circuit for said test relay, a series relay, means for operating said series relay, means whereby said last means is operated in response to the receipt'of said second series of received impulses, means for initially preparing said test relayop crating circuit, means whereby said last means is controlled by the operation of said series relay, other means for further
  • test relay means whereby said last means is operated by the first impulse of the third series of impulses, means contacts arranged in levels and in groups said' contacts when idle having onepotenti aLcd'n- 11 nected thereto and when busy having a different potential connected thereto, atest relay, a test circuit including a wiper for connecting said test relay to said bank contacts, a circuit over which said switch is seized and over which impulses corresponding to aplurality of digits are received for operating said switch, a primary and a secondary Operating means in said switch, a control means in said.
  • a transfer relay means to operate said transfer relay, means whereby said last means is controlled by the seizure of said switch, transfer means for causing said control means to have control over said primary operating means, means whereby said transfer means is controlled by the operation of said transfer relay, means for operating said primary operating means to direct said wiper onto a digitally selected level of said bank contacts, means whereby said last means is operated by said control means when actuated by the first series of received impulses, means for releasing said transfer relay, means whereby said last mentioned means is controlled by the primary operation of said switch upon the termination of said first tuation of said control means when operated by the second series of received impulses, an operating circuit for said test relay, a series relay, means for operating said series relay, means whereby said last means is operated by said control means when operated by said second series of received impulses, a ring cut-off relay, means for operating said ring cut-off relay, means whereby said last means is controlled by the operation of said series relay, means for preparing said test relay operating
  • a test relay a test circuit including a wiper for connecting said test relay to saidbank contact, a circuit over which said switch is seized and over which impulses corresponding to a plurality of digits are received for operating said switch, a series relay, means for stepping said wiper to select a level of contacts, means whereby said last means is operated by the first series of received digital impulses, other means for operating said series relay and for stepping said wipers to select the first contact of said groups of contacts, means whereby said other means is operated by the second series of received digital impulses, an operating circuit for said test relay, means for releasing said series relay, means whereby said last means is operated in response to termination of said second series of impulses, means for preparing said operating circuit, means whereby said last means is op-' erated by the release of said series relay after the completion of the selection of
  • a circuit over which the switch is seizedandover which a plurality of series of digital impulses are received a plurality of bank contacts arranged in levels and in groups therein, said contacts when idle having one potential connected thereto and when busy having a different potential connected thereto, a test relay, a test circuit including.
  • a wiper for connecting said test relay to said bank contact, means for stepping said wiper to select alevel of said bank contacts, means whereby said last means is-operated by the first series of received digital impulses, a second means for stepping said wiper to select the first contact of saidgroup of contacts, means whereby said last means is operated by the second series of received digital impulses, an operating circuit for said test relay, a series relay, means for operating said series relay, means whereby said last means operated bythe secondv series of received impulses,- means for preparing said test relay operatingcircuit, means whereby said last means is controlled by the operation of saidseries relay, other means for further preparing.
  • test relay operating circuit means whereby said other means is controlled by the release of said series relay, means for completing said test relay operating circuit for operating said test relay, means whereby said last means is operated by the first impulse of the third series of received digital impulses, means for completing said test circuit for said: test relay to maintain said test relay operated it said wiper said third series of receiveddigitalimpulses and controlled by said test relay remaining operated, a switching relay, means for operating said switching relay, means whereby said last means is controlled by the release of saidtest relay, means for maintaining said switching relay operated independent of further operation of said test relay and independent of the connection to the potential on said bank contact, means whereby said last mentioned means is controlled'by the operation of said switching relay, means for disabling said second means to prevent further stepping of said wiper, and means whereby said last means is controlled by the operation of said switching relay.
  • a test relay a test circuit including a wiper for connecting said test relay to said bank contacts, a circuit over which said switch is seized and over which impulses corresponding to a plurality of digits are received for operating said switch, a primary and a secondary operating means in said switch, control means in said switch actuated by said received impulses, a transfer relay, means for operating said transfer relay, means whereby said last means is controlled by the seizure of said switch, means for causing said control means to have control over said primary operating means, means whereby said last means is controlled by the operation of said transfer relay, said control means to operate said primary operating means to direct said wiper onto a level of said bank contacts, means whereby said control means is actuated by the first series of impulses, means for releasing said transfer relay, means whereby said last means is controlled by the primary operating means of said switch upon the
  • a test relay a test circuit including a wiper for connecting said test relay to said bank contacts, a circuit over which said switch is seized and over which impulses corresponding to a plurality of digits are received for operating said switch, means for stepping said wiper to select a level of contacts, means whereby said last means is operated by the first series of received digital impulses, other means for stepping said wiper to select the first contact of said group of contacts, means whereby said last means is operated by the second series of received series of digital impulses, an operating circuit for said test relay, means for preparing said operating circuit, means whereby said last means is operated after the selection of said first contact of said groups of contacts, means for completing said operating circuit, means whereby said last means is operated by the first impulse of a third series of received impulses, means for completing said test circuit to maintain said test relay operated
  • ndarx a ndarx;lopfi atin zm ans; the swi h; 1& test rsl m fire mtr sf rmean i flcon rolsm an ns: ton Q e a ing: m con rol; meansnm nsv ebwa dzlast means smner te z yyreceiyed impul fii oy espon insu op zp u ality.
  • saidz test relay operating circuit means wherebynsaidglast 4 15: 1 6 11 5 45 controlled by the operation: of said series-relayxzmeans for further.
  • preparing Saddam test .rg layncircuihiand means;wherebyasaidlast 1 means-is -control'led:byo-the releaseaof said-series MORRISv gGRIE-FKNS-g 11' References citedyin Ethe' file of :this patent:

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Relay Circuits (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US129599A 1949-11-26 1949-11-26 Rotary connector switch Expired - Lifetime US2652454A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE499228D BE499228A (en, 2012) 1949-11-26
US129599A US2652454A (en) 1949-11-26 1949-11-26 Rotary connector switch
GB25048/50A GB683339A (en) 1949-11-26 1950-10-13 3 digit pbx connector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US129599A US2652454A (en) 1949-11-26 1949-11-26 Rotary connector switch

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US2652454A true US2652454A (en) 1953-09-15

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US129599A Expired - Lifetime US2652454A (en) 1949-11-26 1949-11-26 Rotary connector switch

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US (1) US2652454A (en, 2012)
BE (1) BE499228A (en, 2012)
GB (1) GB683339A (en, 2012)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1386688A (en) * 1919-06-05 1921-08-09 Western Electric Co Telephone-exchange system
US1556897A (en) * 1925-04-14 1925-10-13 Reuben H Bare Perforation cleaner for oil-well casings
US1799175A (en) * 1927-02-25 1931-04-07 Merk Friedrich Automatic telephone system
US1872720A (en) * 1929-08-09 1932-08-23 Ass Telephone & Telegraph Co Telephone system
US1885784A (en) * 1930-03-31 1932-11-01 Siemens Brothers & Co Ltd Automatic switch
US2444065A (en) * 1941-04-15 1948-06-29 Int Standard Electric Corp Electrical signaling system
US2452578A (en) * 1941-05-20 1948-11-02 Int Standard Electric Corp Telephone system utilizing a register controller

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1386688A (en) * 1919-06-05 1921-08-09 Western Electric Co Telephone-exchange system
US1556897A (en) * 1925-04-14 1925-10-13 Reuben H Bare Perforation cleaner for oil-well casings
US1799175A (en) * 1927-02-25 1931-04-07 Merk Friedrich Automatic telephone system
US1872720A (en) * 1929-08-09 1932-08-23 Ass Telephone & Telegraph Co Telephone system
US1885784A (en) * 1930-03-31 1932-11-01 Siemens Brothers & Co Ltd Automatic switch
US2444065A (en) * 1941-04-15 1948-06-29 Int Standard Electric Corp Electrical signaling system
US2452578A (en) * 1941-05-20 1948-11-02 Int Standard Electric Corp Telephone system utilizing a register controller

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Publication number Publication date
BE499228A (en, 2012)
GB683339A (en) 1952-11-26

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