US1914384A - Telephone system - Google Patents

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Publication number
US1914384A
US1914384A US573760A US57376031A US1914384A US 1914384 A US1914384 A US 1914384A US 573760 A US573760 A US 573760A US 57376031 A US57376031 A US 57376031A US 1914384 A US1914384 A US 1914384A
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United States
Prior art keywords
group
relay
contacts
wipers
contact
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
Application number
US573760A
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English (en)
Inventor
Rodney G Richardson
John I Bellamy
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Associated Electric Laboratories Inc
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Associated Electric Laboratories Inc
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Filing date
Publication date
Priority to FR744372D priority Critical patent/FR744372A/fr
Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US573760A priority patent/US1914384A/en
Priority to GB29605/32A priority patent/GB409015A/en
Application granted granted Critical
Publication of US1914384A publication Critical patent/US1914384A/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
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Definitions

  • the present invention relates to telephone systems in general, being concerned more particularly with automatic telephone systems; and the main object is the production ot a new and improved trunking selector switch for use in an automatic telephone system in which the switches which respond to the controlling impulses to set up the telephone connections have only a simple rotary movement, and are positioned in accordance with the received impulses and re stored to normal position by the saine operating magnet.
  • the present invention may be considered to be an improvement on the invention disclosed in the application of Vicks et al., Serial No. 519,310, filed March 2, 1931; the improvement consisting generally in the provision of such additional circuit arrangements as are found to be desirable or necessary in actual operation, and in the provision of circuit arrangements for providing for unhainpered flexibility in utilizing all the Contact sets in forming any desired number of contact groups (each Contact group corresponding to a different trunk group) and in apportioning the available contact sets in any desired manner amongst the Various contact groups.
  • a trunk group can be formed which is in effect a unitary group but contains many more trunks than there are contact sets allotted to the group in the bank of any one selector, as is well understood; it is desirable, nevertheless, from the standpoint ci securing the greatest possible efliciency in each individual installation, to be able to increase and decrease the num# ber of Contact sets allotted to a Contact group to an extent- ⁇ dictated by the relative size and ccsts-pertrunk of the trunk groups concerned. Tothis end, the circuit arrangements have been modified in order to enable the size oi" a Contact group in the bank of a selector to be expanded or contracted at will.l
  • a feature of the invention is that the wip- ⁇ ers of the newly developed selector are advanced over the contacts of a large group in successive stages, the selector receiving as many impulses as may be necessary to allow time for the advance over a large group to take place. Since the selector uses two sets of wipers, each step of the wipers advances them over two trunk lines; and since the selector is designed so that it will take iive steps reliably in the time of the controlling impulse thereto, the time of one impulse is suiiicient to allow the advance of the wipers over a group Vof ten trunks the time of two iinpulses is suflicient to allow the advance of the wipers of the selector over twenty trunks; etc.
  • a further feature of the present arrangement is that a special terminating conductor is used to mark the end of a group inv the bank of the directing wiper of the selector.
  • .contacts of the release and series relays cooperate with each other and with s un off-normal contacts for connecting a source of dial-tone current when the selector is taken for use (used ordinarily only in connection with a first selector) and for substituting a connection to a source of busytone current at the end of the directive movement of the selector; which connection persists if an idle trunk is not found, but is forthwith broken in case an ,idle trunk is found in the selected group.
  • Another feature of the invention relates to an improved circuit arrangement for preventing the application of busy tone from being interrupted and for preventing the selector from being operated further in case the calling subscriber dials another digit after a busy group has been encountered.
  • This arrangement includes the use of a suitable circuit arrangement for preventing the series relay from reoperating after it has fallen back at the end of a series of impulses to start the trunk-huntingy movement, in which case it cannot reoperate to open the busy tone connection, nor to permit further effective operation of the counting relays which direct the advance of the wipers over the groups of contacts.
  • FIG. 1 is a circuit drawing of the improved selector
  • Figs. 2, 3, and 4 are drawings showing alternative groupings of the bank contacts into contact sets.
  • the selector whose circuits are shown in Fig. 1 has seven wipers, 22-28, there being fifty-one contacts in the path of each wiper, as shown best in Fig. 2. These wipers stand normally on the fifty-first set of contacts, with the cam-controlled, offnormal contacts 41, 42, 43, and 51 normally in the respective open or closed positions indicated on the drawing.
  • the operating magnet 20 is arranged to' be operated in a buzzer-like manner to advance the wipers in a clockwise direction, the wipers being advanced the distance of one contact set each time the magnet is deenergized.
  • Fig. 2 shows all contacts and all of the seven wipersof the selector and it shows the contact sets divided into seven groups, each group giving accessrto ⁇ ten trunks orto a multiple of ten trunks, as is shown in the following table:
  • the one hundred contacts of the switch are divided into eight contact groups of varying sizes, and the final group contains a large number' of contact sets, eighteen of which are obtained bycurtailing groups 2 to 4 and 6, so that these groups are no longer in multiples of ten.
  • Fig. 4 shows the Way in which the bank of the directing wiper 25 is wired when the switch of Fig. 1 is used as an inter-office trunking switch in a system employing register translators (ordirectors), wherein the oiiice-designating digits are recorded and translated into an'ofiice code.
  • the contact sets in Fig. 4 are allocated amongst thirteen contact groups in accordance with the following table:
  • Line relay 13 new operates over conducters and 12 and through contacts of relay 18. Upon operating, line relay 13 closes a circuit for release relay 14, whereupon release relay 14 operates and grounds conductor 4148 at its inner-upper armature; replaces the battery potential on conductor 11 with a ground potential at armature 54; prepares an operating circuit tor series relay 15 and counting relays 16 and 17 at its lower armature; prepares test circuits for relays 19 and 18 at armatures 52 and 53; and at its upper armature completes a connection from the dial tone lead l5 to conductor 1G, which connection includes oil-normal spring cl3, condenser 47, and contacts of relays 15 and 18.
  • the ilow of current from the source of dial tone informs the calling subscriber that he may new proceed to dial the iirst digit in the desired number, the selector of Fig. 1 being assumed to be aV iirstselector.
  • Relay 13 is accordingly de energized momentarily ten times.
  • Relay 1st does not tall back during this operation because it is slow acting by virtue of the resistance element shunted arount its winding.
  • Series relayl responds to the lirst impulse in the series of impulses generated at the resting contact at theV armature of reoit relays lay 13. Being slow acting by virtue of the resistance element shunted around winding, relay 15 remains operated throughout the series ot impulses.
  • relay 15 Upon operating, relay 15 at its lower armature shifts the connection of the directing wiper with operating ⁇ magnet 20 so that it includes the "iterrupter contacts 20-a; closes a locking circuit for itseliLn at its inner-lower armature independent of oil-normal contacts 42; exten ds ground potential from the grounded conductor 48 at its inner-upper armature to the contacts associated with the lower armature oit counting relay 16 5 disconnects the dial tone source at its upper armature; and at armatures 49 and 50 opens points in the test circuits ot rela-ys 18 and 19 so as to prevent a premature operation oi2 these relays during the group selecting movement.
  • each of the ten impulses is delivered to counting relays 16 and 17, which relays are arranged to direct the group-setting operation ot the selector.
  • relays 16 and 17 both operate incidental to the receipt of each odd-numbered impulse, and they both restore incidental to the receipt of each even-numbered impulse.
  • the arrangement is such that relay 16 operates or restores, as the case may be, at the beginning of the concerned impulse, and relay 17 operates or restores, as the case may be, at the end of an impulse. which relays 16 and 17 operate pointed out:
  • the first impulse or any odd-numbered impulse is delivered through the resting contact of armature 13 and the lower armature oiirelay lei, it passes through the lower armature of relay 17 to the lower winding of relay 16.
  • Relay 16 thereupon operates and closes a circuit at its upper armature for its own lower winding in series with the lower winding of relay 17, to ground through the inner-upper armature 15 and 141. No current flows through this locking circuit, however, as long as the initial circuit is intact.
  • the diilerential relay 16 connects up its upper winding in parallel with the upper winding of relay 17 at its lower armature, preparatory to the subsequent restoration of relay 16.
  • relay 16 remains operated in series with relay 17 and relay 17 operates.
  • relay 17 disconnects the impulse conductor from the lower windings et relays 16 and 17 and connects it to the upper windings oi' these relays.
  • relay 16 restores, it opens the locking circuit for the lower windings of relays 16 and 17 at its upper contacts, ⁇ while at its inner-lower armature it opens the circuit of its upper windings.
  • Relay 17 remains operated through its upper winding until the impulse subsides, whereupon relay 17 restores and again transfers the impulse circuit back to the lower windings of relays 16 and 17 preparatory to reoperating the relays upon the receipt of the next impulse (any odd-numbered impulse).
  • Magnet 20 operates in the usualA buzzer-like manner to advance the wipers 22-28, whereupon the wipers .steifY ofiqA t last set of bank contacts, and the other end of the wipers comes into engagement Vwith the first set of bank contacts. The movement does not progress beyond this point iter; the time being because the first contact in the bank of wiper 25 is connected to condiictor 30 (the even conductor), which is not grounded at this time.
  • relay 16 restores at the beginning of the second impulse it removes ground potential from the odd7 conductor 2 and places it on the even7 conductor 30, causing the circuit of magnet 20 to be closed anew and the wipers to be driven over the first contact group and into engagement with the rst set of bank contacts in the sec- AContact in the bank of It is to be noted that the final wiper 25 1n group 1 group-terminatingwhicn conductor is ond group.
  • Relay 18 upon opening a. point 1n the circuit of operating magnet and its innerlower armature, closes a lockingv circuit for its lower winding in series with magnet 20 (magnet 20 does not operate in series with the lower winding of relay 18 because of the relatively high resistance of the said winding) opens a point in the test circuit of relay' 19 and connects up wiper 27 to the incoming release-trunk conductor 11 at its inner-upper armature; and at' its upper and lower armatures it disconnects conductors 10 and 12 from the windings of the line relay 13 (theppby stopping the application of busy tone to the calling line) and' extends them by way of the operated upper and lower armatures of relay 19 to wipers 26 and 28.
  • magnet 20 operates in the usual buzzer-like manner to advance the wipers until they arrive upon the fifty-first set of bank contacts, whereupon the off-normal contacts, including off-normal contacts 41, are restored to their normal position, and the wipers stop because the restoring circuit of magnet 20 is opened at normal contacts 41.
  • neither relay 18 nor relay 19 can reoperate to interfere with the restoring operation because the test circuits of these relays are open at armatures 52 and 58 of the now-deenergized release relay 14.
  • the idle indicating battery potential is reapplied to conductor 11 by way of off-normal contacts 51 and armature 54 when the switch again arrives in its normal or home posit-ion.
  • relay 18 cannot operate until after relay 19 has operated and brought relay 18 under the control of wiper 27, whichl connects with the idle trunk line. In this case relays 19 and 18 operate successively,- while in the previously described example the two relays are operated practically simultaneously.
  • AZZ-trunks busy 'in the selected group
  • the wipers of the selector continue to advance until they arrive upon the last contact set in the group.
  • a new circuit for operating magnet Q0 is closed by way of directing wiper 25 and the groupterminating-ground conductor 48, which circuit excludes the interrupter contacts QO-a, being closed through the lower, armature of relay 15 and-its resting contact, and contacts of relays 19 and 18. over this circuit and remains operated, thereby preventing a further advance of the wipers of the switch, it being remelnbered that the wipers are advanced upon the falling back of the magnet rather than upon the operation thereof.
  • operating magnet 20 opens the test circuits of relays 18 and 19, preventing these relays from energizing subsequently in case the trunks terminating in the bankcontacts on which the wipers are now standing subsequently become idle.
  • the third group has nine contact sets therein (eighteen trunks).
  • the contacts in the bank of wiper 25 are connected up-the first five to the even 77 conductor 30, the next three to the odd conductor 29, and the last one to the groupterminating ground conductor 48.
  • the switch wipers therefore, take five steps responsive to the fourth impulse and four more responsive to the fifth impulse; three of the last four being responsive to ground potential encountered by way of conductor 29, and the fourth being responsive to ground potential encountered over conductor 48.
  • VrI'he bank layout of Fig. 4 illustrates one grouping that may be used when the selector ofFig. 1 is used in a system employing register senders which translate digits of the office designation into a desired combination of office code digits.
  • the contact sets of the selector may be divided into as many groups as desired with any desired apportionment of contact sets amongst the established groups, as the number of impulses in a series is not limited to ten as itv is limited, in practice, in a system not using register senders. It is believed that the arrangement in Fig. y4 will be understood in view of the operation of the selector hereinbefore given and the discussion of Fig. 4 in the general description.
  • an automatic switch having groups of lines terminating in the bank thereof, said switch being arranged to respond to a series of impulses and beingl of a fast-operating type so that it will move over a group of lines having not greater than a predetermined maximum number of lines therein in the time allotted 'to one impulse, means responsive to each impulse of a series for driving said switch into association with the neXt succeeding group of lilies in case the group over which it is being driven is not larger than the predetermined maximum size, and means effective when the group of lines over which the switch must ing tWo
  • Wipers g a test c1 st W1 1cuit 90 per, means per sets over u time with and mean f the Selector ired group perating 1t ies cietion With the effective
  • a selector switch haved ch it to adv switch 1 r1 ci' 0i' con wat 1.
  • ln switch qizzition o 1111e relay deci pulse it operat ips 111y one oi' 11 111111 o re- 11e grci 1 the nen com responsive mulino' 11 ger group for c ioved over suc menige vrou .
  • l receivf line W digit to upc of contacts 11' neens the vin u 11 1d l operation iro 1 ive te suie 1ere o contr.
  • ven is zi lar pulees 1 i 1
  • a selector switch having access to a group of lines, a driving circuit and means for closing it to cause said selector to be driven over said lines in search of an idle one, means tor opening saiddriving circuit when an idle line is found, said selector having a home position, and means for restoring said opening means to reclose said driving circuit to cause said selector to be driven to its homel position.
  • an automatic-hunting group-selector having two sets of wipers positioned so that both sets hunt over a group at the same time, a test wiper and an associated test relay or each wiper set, a test circuit for each test relay including the associated test wiper, a test wiper common to both wiper sets, and means controlled by said common wiper and responsive to the end of a selected contact group being reached for separately opening each test circuit.
  • an automatic switch having its contact bank divided into separately designated groups of varying sizes, said switch being responsive to an impulse series containing a random number of impulses to advance by limiting movement into association with the corresponding group of bank contact-s, there being a designation assigned to a specific large group corresponding to a given number ot' impulses, and a designation assigned to the next succeeding group corresponding to a number of impulses greater by more than one than said given number, while the designation assigned to any group next succeeding a small group not greater than a predetermined size corresponds to an impulse series containing only one more impulse than the series corresponding to the designation ot the said small group.
  • an automatic switch having its contact bank divided into separately designed groups of varying sizes, said switch being ⁇ responsive to an impulse series containing'a random number of impulses to advance by a hunting movement into association with the corresponding group of bank contacts, there being a designation assigned to each group immediately following group of not more than a given maximum size, over which the switch can advance in the time ot' one impulse, corresponding to only one impulse more than the number of impulses corresponding to the designation of the group which the said following group immediately follows, and a designation assigned to a group immediately following a group larger than the switch can advance over in the time of one impulse which designation corresponds to a number of impulses greater by more than one than the number ot impulses corresponding to the designation of the said larger group.
  • an automatic switch having its contact bank divided into separately designated groups of varying sizes, said switch being responsive to an impulse series containing a random number of impulses to advance by a hunting movement into association with the corresponding group of bank contacts, and group-huntingcontrol means in said switch for operating the switch into association with any desired group responsive to a number of impulses varying directly with the number of preceding groups and with the respective sizes of such groups.
  • an automatic switch having its contact bank divided into successive groups, means responsive to impulses corresponding to group designations for causing said switch to advance in a group hunting operation until it comes into association with the designated group, and for subsequently causing it to advance in a contacthunting operation until it comes upon an idle contact set in the group, certain of said groups being single-unit groups composed oit not more contact sets than the switch can pass in a single limiting movement responsive to a single directing impulse, while other ot said groups are multi-unit groups composed of two or more units of contact sets, each requiring a separate impulse to enable the switch to pass over the entire group in its group hunting operation, and means effective during the contact-hunting operation of the switch tor stopping the Contact hunting operation or not at the end of a unit number of contact sets, depending upon whether the contact group ends with such unit number of contacts or extends beyond.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Keying Circuit Devices (AREA)
US573760A 1931-11-09 1931-11-09 Telephone system Expired - Lifetime US1914384A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR744372D FR744372A (enrdf_load_stackoverflow) 1931-11-09
US573760A US1914384A (en) 1931-11-09 1931-11-09 Telephone system
GB29605/32A GB409015A (en) 1931-11-09 1932-10-22 Improvements in or relating to telephone systems

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Application Number Priority Date Filing Date Title
US573760A US1914384A (en) 1931-11-09 1931-11-09 Telephone system

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US1914384A true US1914384A (en) 1933-06-20

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US573760A Expired - Lifetime US1914384A (en) 1931-11-09 1931-11-09 Telephone system

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FR (1) FR744372A (enrdf_load_stackoverflow)
GB (1) GB409015A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504708A (en) * 1945-05-04 1950-04-18 Siemens Brothers & Co Ltd Selecting-switch for use in telephone systems
US2513949A (en) * 1945-05-04 1950-07-04 Siemens Brothers & Co Ltd Selecting switch for use in telephone systems
US2541593A (en) * 1945-12-14 1951-02-13 Siemens Brothers & Co Ltd Automatic selecting switch
US2548673A (en) * 1945-05-04 1951-04-10 Siemens Brothers & Co Ltd Marker control apparatus for group selectors
US2582967A (en) * 1946-01-30 1952-01-22 Int Standard Electric Corp Marker-controlled final selector circuit
US2583782A (en) * 1948-01-21 1952-01-29 Automatic Elect Lab Party line connector circuit for code ringing
US2617887A (en) * 1948-11-11 1952-11-11 Automatic Telephone & Elect Automatic switch as used in telephone systems
US2635147A (en) * 1948-10-25 1953-04-14 Automatic Elect Lab Telephone selector switch utilizing odd-even relay
US2693505A (en) * 1949-10-07 1954-11-02 Hartford Nat Bank & Trust Co Circuit-arrangement in an automatic signaling system for the numerical adjustment of a final selector under the control of pulses
US2832835A (en) * 1953-04-27 1958-04-29 Gen Telephone Lab Inc Selecting system utilizing rotary switches
DE969247C (de) * 1955-05-27 1958-05-14 Siemens Ag Schaltungsanordnung fuer durch Nummernstromstoesse einzustellende Waehler mit einer Bewegungsrichtung in Fernmeldeanlagen, insbesondere Fernsprechanlagen
US2845493A (en) * 1949-11-26 1958-07-29 Siemens Ag Control of telephone switches having plurality of simultaneously operated sets of wipers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254961A (en) * 1991-04-15 1992-10-21 Ford Motor Co Plunger switch with displaceable stop means

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504708A (en) * 1945-05-04 1950-04-18 Siemens Brothers & Co Ltd Selecting-switch for use in telephone systems
US2513949A (en) * 1945-05-04 1950-07-04 Siemens Brothers & Co Ltd Selecting switch for use in telephone systems
US2548673A (en) * 1945-05-04 1951-04-10 Siemens Brothers & Co Ltd Marker control apparatus for group selectors
US2541593A (en) * 1945-12-14 1951-02-13 Siemens Brothers & Co Ltd Automatic selecting switch
US2582967A (en) * 1946-01-30 1952-01-22 Int Standard Electric Corp Marker-controlled final selector circuit
US2583782A (en) * 1948-01-21 1952-01-29 Automatic Elect Lab Party line connector circuit for code ringing
US2635147A (en) * 1948-10-25 1953-04-14 Automatic Elect Lab Telephone selector switch utilizing odd-even relay
US2617887A (en) * 1948-11-11 1952-11-11 Automatic Telephone & Elect Automatic switch as used in telephone systems
US2693505A (en) * 1949-10-07 1954-11-02 Hartford Nat Bank & Trust Co Circuit-arrangement in an automatic signaling system for the numerical adjustment of a final selector under the control of pulses
US2845493A (en) * 1949-11-26 1958-07-29 Siemens Ag Control of telephone switches having plurality of simultaneously operated sets of wipers
US2832835A (en) * 1953-04-27 1958-04-29 Gen Telephone Lab Inc Selecting system utilizing rotary switches
DE969247C (de) * 1955-05-27 1958-05-14 Siemens Ag Schaltungsanordnung fuer durch Nummernstromstoesse einzustellende Waehler mit einer Bewegungsrichtung in Fernmeldeanlagen, insbesondere Fernsprechanlagen

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Publication number Publication date
FR744372A (enrdf_load_stackoverflow) 1933-04-19
GB409015A (en) 1934-04-23

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