US2761906A - Rotary finder and secondary - Google Patents

Rotary finder and secondary Download PDF

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Publication number
US2761906A
US2761906A US341490A US34149053A US2761906A US 2761906 A US2761906 A US 2761906A US 341490 A US341490 A US 341490A US 34149053 A US34149053 A US 34149053A US 2761906 A US2761906 A US 2761906A
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US
United States
Prior art keywords
contacts
finder
wipers
relay
switch
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
US341490A
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English (en)
Inventor
Clarence E Lomax
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE526787D priority Critical patent/BE526787A/xx
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Priority to US341490A priority patent/US2761906A/en
Priority to GB5587/54A priority patent/GB739951A/en
Priority to FR1096765D priority patent/FR1096765A/fr
Priority to DEA19784A priority patent/DE935553C/de
Application granted granted Critical
Publication of US2761906A publication Critical patent/US2761906A/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
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
    • E03B3/04—Methods or installations for obtaining or collecting drinking water or tap water from surface water

Definitions

  • This invention relates in general to telephone systems and more particularly to switching systems therein.
  • the plunger line switch had the advantage of being associated with a particular subscriber line and was always standing opposite an idle trunk, thereby reducing to a minimum the time required to connect the calling line to a first numerical switch.
  • the necessity for economy resulted in replacement of the line switch with a finder switch common to a group of lines, but the finders have had the disadvantage of a short time delay before connecting a calling line to a first numerical switch.
  • the delay time was shortened somewhat by the use of double wipers hunting simultaneously over pairs of lines; but this resulted in the use of additional relays to prevent the finder from switching through to both of two calling lines, the time delay being dependent partly upon the operating time of said additional relays.
  • a preselecting finder-allotter 311i) is utilized to further reduce the time delay factor.
  • An object of this invention is a reduction in the number of expensive numerical switches necessary to provide a predetermined grade of service.
  • a feature of this invention is the use of a new and novel finder-secondary switch link.
  • a feature of this invention is the use of a new and novel switch of the type having a non-numerical or partially non-numerical function.
  • Another feature is the use of a new and novel shuntfield driving magnet in a non-numerical or partially nonnumerical switch.
  • Another feature is the use of new and novel circuits with a shunt-field driving magnet.
  • Another feature is the new and novel means for preventing the release of the cutofi relay of a busy line circuit until after the restoration of the switching relay of the finder to which said line circuit has been connected.
  • Fig. 1 shows a substation, the line of circuit associated therewith and a finder having access thereto;
  • Fig. 2 shows a secondary switch associated with the finder shown in Fig. 1;
  • Fig. 3 shows an allotter to which said finder and said secondary switch are available.
  • a shunt-field motor magnet with two windings and a single armature has been used for the first time in switches.
  • a shunt-field relay has been previously .used in conjunction with a driving magnete. g. the Martin Patent No. 1,564,487-but this resulted in a more expensive switch and in a slower operation of the switch.
  • the present circuits have been arranged such that a magnet winding will be operated and the switching relay, associated therewith, short circuited if the test wiper associated with said winding :and relay encounters ground. If said wiper encounters absence of ground, said relay will operate in series with said winding; but the winding will not operate. If both test wipers encounter absence of ground at the same time, that switching relay, which operates first, will open the operating circuit to the other relay to prevent its operation.
  • the shunt-field magnet will operate its armature to step the wipers only if .both windings thereof are energized-as described in the Erickson Patent No. 1,544,300.
  • the use of the shunt-field magnet need not .be restricted to finders and secondary switches; rather it may be used in any non-numerical or partly non-numerical switch, such as an allotter or a selector, with. variations in the circuits disclosed herein.
  • Off-normal springs 297, 298 and 299 are provided in the secondary switch to busy mark the link while it is in use and to cause the switch to return to home position when it is released. In this manner, the numerical switches accessible to the switch are taken .into use in a definite order of priority. It may be of advantage, then, to make some of the selectorsthose to be taken into use lastavailab'le from more than one group of lines, thereby to furtherreduce the number of "selectors necessary in a system and increase the flexibility therein.
  • a means, well known in the art, for kicking the allotter oii a defective finder-secondary switch link is provided.
  • R330 When R330 operates in response to a call, it prepares at contacts 334 a circuit for operating kick-cit relay R350. Timed impulses. are received over conductors 398 and 39.9 from a timing device (not shown) common to 399 after contacts 334' operate will operate R350. The next impulse received over conductor 398 and operated contacts 351 will operate M310 to step the allotter wipers to the next accessible link. This last impulse will short circuit R330; R330 will restore to open contacts 334;
  • R350 will restore; and R330 will reoperate when contacts 311 restore.
  • a circuit including said sub- R120 removes ground from testcontact 165 and places thereon battery from cutoff relay R110; at contacts 123, busy marks the line to all connectors having access thereto; and at contacts 125, completes a circuit, including start lead 171, relay R330, the winding of the allotter motor magnet M310 and 'its self-interrupting contacts 311, for operating the allotter startrelay R330. M310, however, does not operate. Assume allotter 300 has preselected idle finder 102 and idle secondary switch 200.
  • R330 completes an obvious circuit for operating hold relay R340; at contacts 335, grounds the all trunks busy conductor 173, thereby to maintain all trunks busy relay R320 operated-even though all other finders are in use-until finder 102 and secondary switch 200 complete their operations; and at contacts 336, ,completes a circuit over conductor 281 for operating the start relay R210 of the finder-secondary link.
  • Hold relay R340 operates and at contacts 343 and 344 places an alternate ground on conductors 173 and 281.
  • Link start relay R210 operates; contacts 215 and 216 operate faster than contacts 213 and 214 to assure the short circuiting of the switching relays R130 and R140 prior to the completion of their operating circuits if the lines, upon which the finder wipers are standing, are noncalling lines so that the finder cannot falsely switch through to a non-calling line; and contacts 224 and 225 operate faster than contacts 211 and 212 to similarly prevent the secondary switch from falsely switching through to a busy numerical switch.
  • R210 completes a circuit over contacts 212, relay R250, contacts 235, 220 and 271 and magnet M270 for operating the secondary switching relay R250, a similar circuit for operating the secondary switching relay R230;
  • test wipers 166 and 168 will encounter ground on'thetest contacts. Ground over contacts 114 and 122 is placed on test contact 165. When a call has been initiated over line circuit 101 and extended by finder 102, ground is placed on contact 165 over contacts 134 and wiper 166.
  • wipers will be advanced one step. If the wipers do not encounter the calling line circuit 101, M150 will again be operated similarly to again advance the wipers. This will continue until the finder'wipers encounter line circuit 101.
  • switching relay R140instead of R130 will operate and at its contacts 141 and 142 extend said last-mentioned calling line to secondary switch 200.
  • circuits for operating the switching relays R230 'and R250 of secondary switch 200 are completed in response to the operation of start relay R210.
  • Secondary switch 200 will hunt for an idle selector and switch through connections to only one idle selector in a manner similar to that in which finder 102 hunts for and switches through to one calling line as previously described.
  • the line associated with substation 100 will be extended to the line relay of said selector by way of contacts 131 and 132, conductors 176 and 177, and 281 and 232, contacts 231 and 232, wipers 231 and 292 and the selectors incoming conductors which are accessible to said wipers.
  • the line relay and hold relay of the selector will operate and return ground over private conductor of the selector, wiper 296 and operated contacts 234 to hold R230 operated and also over contacts 233, conductor 178 and contacts 133 to hold R130 operated.
  • relays R130 and R230 When relays R130 and R230 operate, they remove at contacts 130 and 240 multiple ground potentials from the all trunks busy conductor 173.
  • a switch with two sets of wipers having access to said pairs of lines, said switch comprising a magnet having two windings and a single armature, each of said windings corresponding to one of said wiper sets; a switching relay corresponding to each wiper set; means for connecting said windings and said relays to the wiper sets corresponding thereto; circuit means operated and effective in response to a wiper set encountering said one condition for operating the switching relay connected thereto, and operated and effective in response to a wiper set encountering said other condition for energizing the winding connected thereto and for preventing an operation of the switching relay connected thereto; armature-controlled means operated and efiective only in response to an energization of both windings for advancing the wipers one step; and contacts operated in response to the operation of a switching relay for switching through connections to its respective wiper
  • an automatic switch having two sets of wipers and pairs of lines accessible to said wiper sets, a particular potential condition normally connected to each of said lines; a magnet having two windings and a single armature; means for energizing each of said windings; means whereby said last means is operated to energize one of said windings when one set of wipers encounters said condition on one of said lines and to energize the other winding when the other set of wipers encounters said condition on the line paired with said one line; means including said armature for advancing said wipers over said pair of lines; and means associated with said magnet whereby said last means is operated only in response to the energization of both windings.
  • a pair of switching relays means for connecting each of said relays to a respective one of said wiper sets, means for operating each of said relays, and means whereby said last means is operated to operate one of said relays if the wiper set connected thereto encounters a condition other than said particular potential condition.
  • a finder switch with two sets of wipers having access to said pairs of lines, said finder comprising a magnet with two windings and a single armature, each of said windingsv corresponding to one set of said wipers; a switching relay corresponding to each set of said wipers; means for connecting said windings tion of both windings for advancing the wipers one step, the wipers thereby being advanced when the wipers encounter a pair of idle lines and being stopped when one set of wipers encounters the calling line; and contacts operated in response to the operation of the switching relay connected to said one set of wipers for switching through connections to said calling line.
  • said finder also comprising means operated in response to said wipers encountering a pairof calling lines for preventing the operation of one of said switching relays, whereby connections are switched through to only one of said pair of calling lines.
  • a switch with two test wipers for simultaneously testing pairs of lines for said conditions, said switch comprising a magnet with two windings and a single armature; a switching relay connected to each of said windings; circuits including the winding of each one of said relays and the magnet Winding connected thereto for operating each relay; means for completing both of said circuits and for connecting each of said test wipers to one of said cir-.
  • a finder switch having two sets of wipers having access to .said pairs of lines; a secondary switch, connected to said finder switch, having two sets of Wipers; a plurality of pairs of trunks accessible to saidsecondary wipers; each of said switches including a motor magnet having two windings and a single armature and each including two switching I relays; meansfor connecting each wiper set to a corresponding relay and Winding; circuit means operated and effective in response to the initiation of a call for energizing each winding of the finder magnet whenever the finder wiper set connected thereto encounters a non-calling wipers advancing only when a'pair of busy trunks are 1 encountered; circuit means operated and effective in response to one of said finder wiper sets encountering said calling line for operating the finder switching relay connected thereto; circuit means operated and efiective in response to one of said secondary wiper sets encountering an idle one of said

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Keying Circuit Devices (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US341490A 1953-03-10 1953-03-10 Rotary finder and secondary Expired - Lifetime US2761906A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE526787D BE526787A (fr) 1953-03-10
US341490A US2761906A (en) 1953-03-10 1953-03-10 Rotary finder and secondary
GB5587/54A GB739951A (en) 1953-03-10 1954-02-25 Rotary finder and rotary secondary switch link
FR1096765D FR1096765A (fr) 1953-03-10 1954-02-26 Installation téléphonique avec liaison entre chercheur rotatif et sélecteur auxiliaire rotatif
DEA19784A DE935553C (de) 1953-03-10 1954-02-28 Schaltungsanordnung fuer Fernsprechanlagen mit Waehlersystemen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US341490A US2761906A (en) 1953-03-10 1953-03-10 Rotary finder and secondary

Publications (1)

Publication Number Publication Date
US2761906A true US2761906A (en) 1956-09-04

Family

ID=23337789

Family Applications (1)

Application Number Title Priority Date Filing Date
US341490A Expired - Lifetime US2761906A (en) 1953-03-10 1953-03-10 Rotary finder and secondary

Country Status (5)

Country Link
US (1) US2761906A (fr)
BE (1) BE526787A (fr)
DE (1) DE935553C (fr)
FR (1) FR1096765A (fr)
GB (1) GB739951A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1521160A (en) * 1921-04-18 1924-12-30 Western Electric Co Toll-switching system
US1641788A (en) * 1920-12-09 1927-09-06 Automatic Electric Inc Automatic telephone system
US2214908A (en) * 1939-04-21 1940-09-17 Associated Electric Lab Inc Telephone system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1641788A (en) * 1920-12-09 1927-09-06 Automatic Electric Inc Automatic telephone system
US1521160A (en) * 1921-04-18 1924-12-30 Western Electric Co Toll-switching system
US2214908A (en) * 1939-04-21 1940-09-17 Associated Electric Lab Inc Telephone system

Also Published As

Publication number Publication date
BE526787A (fr)
FR1096765A (fr) 1955-06-24
GB739951A (en) 1955-11-02
DE935553C (de) 1955-11-24

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