US2499542A - System for obtaining successive operation of the selecting magnets in crossbar switches - Google Patents

System for obtaining successive operation of the selecting magnets in crossbar switches Download PDF

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Publication number
US2499542A
US2499542A US586849A US58684945A US2499542A US 2499542 A US2499542 A US 2499542A US 586849 A US586849 A US 586849A US 58684945 A US58684945 A US 58684945A US 2499542 A US2499542 A US 2499542A
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United States
Prior art keywords
magnet
relay
contact
selecting
operating
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Expired - Lifetime
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US586849A
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English (en)
Inventor
Thunell Karl Harry
Vigren Sten Daniel
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Publication of US2499542A publication Critical patent/US2499542A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/22—Switches without multi-position wipers
    • H01H67/26—Co-ordinate-type selector switches not having relays at cross-points but involving mechanical movement, e.g. cross-bar switch, code-bar switch
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Definitions

  • spring groups have certaindisadvantages. It isamong other thingsdifiicult to place the contact.
  • eachselecting bar is op.-
  • said-contactspring. groups will be entirely disposed of, as all-contacts necessary for a successive operation of the-selecting magnets are actuated by anoperating magnet and only indicated by the selecting magnets.
  • an operating magnet is provided tobe operated by said current impulses or current break, the systembeing arranged'so that, over field contacts, closedby indication of an actuated selecting magnet, asucceeding selecting magnet is. energized; the indicating member of said selecting magnet is set in indicating positon below the respective field.
  • drawings- Figs. 1,. 2. and.3 show two embodiments thereof for. numerical. setting-,.f0r instance, in group or;
  • STR blocking relay
  • STM1 and NR an impulse controlling. relay. All I these re lays have functions/known per se.
  • Theldiagram is:simplified, only; the circuits and switching elementsrequired for a clear unde standing of the invention being shown.
  • the system operates principally. as follows.
  • Atwacallon line L .theimpulse indicat-ngrelay IMBwis operated; whereby a magnetization circuiti for'relay TBR; isclosed overmake in the switchingacontaot .IJ.IMR.
  • relay IMR is released; while the relay TBR in known manner. is-
  • relay IVR being short-circuited at said contact 2- HBRM when the operating magnet HBRM is non-energized.
  • relay IVR receives holding current through its winding 11 over contacts IIVR., 2-IMR and 2TBR.
  • the selecting magnet STMi and, in series with it, relay HRz are now energized over contacts l IMR, I-TBR, 2--IVR and 2-STM0.
  • the operating magnet HBRM being operated, indicating member on selecting bar of selecting magnet STM1 cannot be inserted below the field contact group but rests at the moment resiliently against the lifting spring or corresponding member below said field contact group.
  • the magnetization current for the operating magnet HBRM is now interrupted at the make-and-break contact IHRz and when the operating magnet is released the circuit for selecting magnet STMO and relay I-lR1 at contact 3STM0 is interrupted.
  • the selecting magnet STMI and relay HRz remain in operated position as they receive holding current over contacts 3IVR and 2--HR2 and resistance R1.
  • the resistance value of resistances R1R4 is selected so that the respective selecting magnets are not operated by current therethrough but only held in operated position after once having received more powerful make current. Indicating device on the bar of the selecting magnet STM1, by its elastic force, penetrates under the respective multiple contact group.
  • the magnetization circuit for selecting magnet STMz and relay HR1 at contact l--IMR over contacts l-TBR, 2--IVR and 2-STM1 is formed.
  • relay HR1 operates a holding circuit is closed for selecting magnet STMz and relay HRI over contacts 3IVR and 2HR1 and resistance R2.
  • the circuit for winding II- I-IBRM at contact 3HR1 is interrupted and selecting magnet STM1 and relay HRz are released when contact 3-STM1 is broken on release of operating magnet I-IBRM.
  • the winding I HBRM is energized over contacts 2TBR, l- HRz and I-IBRM is again operated. The operation described above is repeated if further impulses arrive on the line L.
  • relays IMR and TBR are energized.
  • relay IMR releases at the first current break a circuit is completed for selecting magnet STMo at contact l--IMR. over contacts ITBR and l-STR.
  • a make circuit or relay STR1 at contact 2-STR is closed.
  • relay IVR At contact 4--STM0 a circuit is closed for winding I on relay IVR, which is however kept short-circuited over contacts 3--IVR, 2-IMR and 2TBR as long as relay IMR. is non-energized.
  • the make circuit is broken for winding IHBRM and the short-circuiting of relay IVR, is removed, said relay thus operating.
  • the relay IVR receives holding current through its winding II over contacts 3IVR, 2IMR and 2TBR and a circuit is completed for winding l'l on Operating magnet over contact l--IMR, I-TBR, l-STR and 2IVR.
  • Contact l-HBRM has for an object to guarantee the closing of the operating magnet, even if relay IMR should be operated before the operating magnet has had time to operate again, thus rendering the system independent, to a certain extent, of the impulse condition of the impulse train.
  • magnets STMo, STM1 etc. are selecting magnets in a crossbar switch.
  • BRM1. and BRMQ are selecting magnets in a crossbar switch.
  • Each contact field of the operat ng magnet contains three contact strips S1, S2 and S3.
  • the relay set-of thezgroup .selecton'isicomposedl of a. test vrelay LYR an impulse: indicating: relay J MR, a slow-acting so-called cut-out relay TBR,
  • relay STR When the relay JMR at thetermination of the impulse is attracted again, relay STR. is energized by current through its winding 1. over contacts l--JMR and 2-SMR.
  • the make circuit for selecting magnet STMO is broken at contact 4-STR and; for relay. SMR, .atcontact I l-STRi. Both remain however attracted, .the .-selecting; magnet STMo fen-holding currentloverz res-iStanceufmand relay SMR due to delayed action. It is to be observed that the resistances rare so dimensioned that the selecting magnets are not operated in series therewith, but receive sumcient current to remain actuated when once in operated position.
  • the relay JMR After termination of thelast' numerical impulse the relay JMR, remains closed, causing-relay circuits are broken for selecting magnets STM wherefore the hereupon followingoperation of the operating magnet BRMc does not cause any selecting magnet to operate.
  • the lastoperated selecting magnet hereafter remains operated irrespective of the position-of theoperating mag-'- net- BRMt sinceit receivesholdingcurrent overcontacts li -SMR and f4-'-STR.
  • test relay LYR 75 TBR also releases.
  • a cross bar switch and an impulse relay said cross bar switch including selecting magnets and an operating magnet, an operating bar actuated by the said operating magnet, one contact set on said operating bar for each selecting magnet, one contact in each of said contact sets, when actuated, closing a circuit for energizing a succeeding selecting magnet, means for energizing one of said selecting magnets, means for energizing said operating magnet in dependence upon an impulse from said impulse relay to actuate the contact set for the energized selecting magnet, means for operating said succeeding selecting magnet, means for releasing the first and holding the last energized selecting magnet upon said operating magnet being released and thereafter energized by another impulse from said impulse relay.
  • a cross bar switch and an impulse relay said cross bar switch including selecting magnets and an operating magnet, an operating bar actuated by the said operating magnet, one contact set on said operating bar for each selecting magnet, one contact in each of said contact sets, when actuated, closing a circuit for energizing a succeeding selecting magnet, means for energizing one of said selecting magnets by an impulse from said impulse relay, means for energizing said operat- 3.
  • a cross bar switch and an impulse relay said cross bar switch including selecting magnets and an operating magnet, an operating bar actuated by the said operating magnet, one contact set on said operating bar for each selecting magnet, one contact in each of said contact sets, when actuated, closing a circuit for energizing a succeeding selecting magnet, means for energizing one of said selecting magnets, means for energizing said operating magnet, in dependence upon an impulse from said impulse relay to actuate the contact set for the energized selecting magnet, means for operating said succeeding selecting magnet, means for releasing the first energized selecting magnet, when said operating magnet is energized by said impulse, and for holding the said succeeding selecting magnet after the termination of said impulse.
  • two circuits for actuating the operating magnet, controlled by said impulse relay, a winding for the operating magnet in each of said circuits, said two circuits energizing the operating magnet in opposite directions, means changing said two circuits at th beginning of each impulse from said impulse relay.
  • two circuits for actuating the operating magnet,,controlled by said impulse relay, a winding for the operating magnet in each of said circuits, said two circuits energizing the operating magnet in opposite directions, means changing said two circuits after the end of each impulse from said impulse relay.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Relay Circuits (AREA)
US586849A 1944-05-17 1945-04-06 System for obtaining successive operation of the selecting magnets in crossbar switches Expired - Lifetime US2499542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE254114X 1944-05-17

Publications (1)

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US2499542A true US2499542A (en) 1950-03-07

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US586849A Expired - Lifetime US2499542A (en) 1944-05-17 1945-04-06 System for obtaining successive operation of the selecting magnets in crossbar switches

Country Status (4)

Country Link
US (1) US2499542A (enrdf_load_stackoverflow)
CH (1) CH254114A (enrdf_load_stackoverflow)
FR (1) FR913401A (enrdf_load_stackoverflow)
NL (1) NL61666C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704785A (en) * 1949-05-02 1955-03-22 Telephone Mfg Co Ltd Automatic telephone-exchange systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1575326A (en) * 1923-10-18 1926-03-02 Western Electric Co Registering mechanism
US2038222A (en) * 1935-06-26 1936-04-21 Bell Telephone Labor Inc Telephone system
US2259101A (en) * 1940-05-15 1941-10-14 Bell Telephone Labor Inc Telephone system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1575326A (en) * 1923-10-18 1926-03-02 Western Electric Co Registering mechanism
US2038222A (en) * 1935-06-26 1936-04-21 Bell Telephone Labor Inc Telephone system
US2259101A (en) * 1940-05-15 1941-10-14 Bell Telephone Labor Inc Telephone system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704785A (en) * 1949-05-02 1955-03-22 Telephone Mfg Co Ltd Automatic telephone-exchange systems

Also Published As

Publication number Publication date
FR913401A (fr) 1946-09-10
CH254114A (de) 1948-04-15
NL61666C (enrdf_load_stackoverflow) 1948-09-15

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