US2326551A - Selecting system - Google Patents

Selecting system Download PDF

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Publication number
US2326551A
US2326551A US377998A US37799841A US2326551A US 2326551 A US2326551 A US 2326551A US 377998 A US377998 A US 377998A US 37799841 A US37799841 A US 37799841A US 2326551 A US2326551 A US 2326551A
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US
United States
Prior art keywords
tubes
discharge
tube
voltage
circuits
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
US377998A
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English (en)
Inventor
Milton E Mohr
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.)
AT&T Corp
Original Assignee
Bell Telephone 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 NL68615D priority Critical patent/NL68615C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US377998A priority patent/US2326551A/en
Priority to GB3424/42A priority patent/GB549440A/en
Priority to CH237702D priority patent/CH237702A/de
Application granted granted Critical
Publication of US2326551A publication Critical patent/US2326551A/en
Priority to FR938498D priority patent/FR938498A/fr
Priority to ES176359A priority patent/ES176359A1/es
Priority to US37858A priority patent/US2564125A/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
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Definitions

  • This invention relates to selecting systems and particularly to systems in which selections are made automatically in a group of lines, trunks or other electrical circuits.
  • An object of the invention is to increase the speed and certainty with which the lines, trunks,
  • circuits or other devices of -a group are rendered unselectable in response to the selection of one of them for use.
  • Another object is to utilize the inductive eiect of a common impedance to render all circuits of a group unselectable in response to the iiow of current resulting from the selection of one of them.
  • Another object is to cause the selection of one of a group of equivalent Circuits by operating a discharge tube individual thereto and to utilize the induc'tance of a common impedance element to render the tubes of all othercir-cuits ineffective.
  • Another object is to utilize both the inductance and resistance of the common element for preventing the selection of other circuits.
  • a selecting system in which a group of equivalent circuits, or other devices, from which selection is to be made is provided with a plurality of discharge tubes, one for each of the several circuits, together with means for causing the discharge of the tube individual to an idle circuit; and in which an inductive element common to all of the tubes responds to the flow of current, when any one of said tubes discharges, to produce a voltage change on the electrodes of all other tubes to prevent another one from discharging and selecting a second one of said circuits. More specincally this selecting system is so arranged that any one of the circuits may be chosen for use providing it is idle at the time selection is required. Tc this end potential is applied to the tubes of all idle circuits.
  • a feature of the invention is a selecting system of the kind above mentioned in which the anodes of the selecting tubes are connected to each other vthrough a plurality of condensers. Whenever current flows in the discharge gap of one of these tubes', the Voltage -drop Vproduced by the work relay in the anode circuit causes charging current to flow in the condensers to reduce the voltage onthe anodes of all other tubes. Thus the voltage diiierence across the discharge gaps of all other tubes is reduced by the instantaneous Voltage drop produced in the common inductance element and by the voltage drop produced by the charging of the condensers connected to the anodes of said other tubes.
  • 02, etc. appear respectively in the vertical rows of contacts in .the switch
  • the subscribers lines are represented, respectively -by individual line relays
  • the outgoing circuits are represented respectively by the select magnets I 0, III,
  • the operation of any desired set of cross-point contacts in the switch is effected by energizing first the select magnet associated with the horizontal row containing thedesired set of contacts and then the hold magnet pertaining to the appropriate vertical row of contacts.
  • a plurality of space dicharge tubes are provided, there being one of these tubes for each horizontal row of contacts, or one tube for each outgoing circuit.
  • 3 is associated with the outgoing circuit
  • 5 are individual respectively to the outgoing circuits
  • these tubes may be of any suitable type, such as those filled with different gases, it has been found that much better results are obtained in the system disclosed herein when tubes filled with argon are employed. Tubes of this type having initial ionizing gaps and main discharge gaps are well known in the art.
  • a starting voltage applied to the ionizing gap causes the initial ionization, which then transfers to the main discharge gap if an operating voltage of sufficient value is applied to the main gap. As soon as the main gap discharges, the voltage necessary to sustain this discharge drops to a value substantially lower than the initial operating voltage.
  • the control or starting electrodes of the discharge tubes are connected respectively to the sleeve or test conductors of the associated circuits, the cathodes of all tubes are connected to a common conductor, and the anodes are connected respectively to the corresponding select magnets.
  • the start electrode IIS of the tube I3 is connected to the test conductor
  • 9 are connected respectively to the test conductors and
  • 24 of all tubes in the group are connected by way of the common conductor
  • , etc. ⁇ are connected to the corresponding select magnets
  • Each of thetube anodes is also connected to one terminal of a condenser, there being one of these condensers for each tube. 'Ihe other terminals of all condensers are joined together by a common conductor.
  • 4 and I I5 are connected to the associated condensers
  • 06 closes an energizing circuit for the group relay
  • 26 closes at its inner left contacts alcircuit for applying the full negative potential of battery
  • the voltage applied across the starting gap II6-I22 isthe sum of the voltages of batteries
  • 31 is deenergized, the circuit
  • 23 is the sum of potentials of batteries
  • ionizing voltage is applied to the starting gaps of all other tubes representing idle outgoing circuits.
  • each busy circuit such as the circuit
  • the inductive reactance of the impedance element 21 is preferably made high in comparison with its The high inductance of the element serves to produce a relatively high voltage when the initially small discharge currents first flow; while the low ohmic resistance of the element permits the subsequent fiow of the relatively heavy discharge currents after the inductive effect of the element has subsided. Due therefore to the inductance of the element
  • ground potential is removed from the sleeve conductor Ii'i, and magnet
  • a plurality of selectable circuits discharge devices individual respectively to said circuits, means for applying a potential to all of said devices to cause any one of them to discharge, means responsive to the current flowing in the discharged device for selecting the corresponding circuit for use, and inductive means responsive to the discharged device for changing the potential on the other discharge devicesto prevent the discharge of a second one thereof.
  • a selecting system oi. a plurality of selectable lines, discharge tubes individual respectively to said lines, each tube having a plurality of electrodes, means for applying a voltage across the electrodes of all tubes suiiicient to cause the operation of any one thereof, discharge circuits, one for each tube, means responsive to the flow of current in the discharge circuit of the first tube to operate for selecting the corresponding line for use, and an inductive element connected in common toan electrode of each of said tubes, said element responding to the current flowing injthe discharge circuit of the operated tube to cause an instantaneous reduction below the operating value of the voltage applied to all other tubes.
  • the current flowing in the rst tube to discharge serving to operate one of said magnets to select the. corresponding line for use, and inductive means connected to all of said tubes and responsive to the discharge current flowing in the first one to operate for lowering the voltage applied to all other tubes to prevent a second one from operating.
  • each tube having a starting gap and a main discharge gap, a source of voltage, a common supply conductor for supplying ionizing voltage from said source to the starting gaps of said tubes and for supplying operating current from said source to the main discharge gaps of said tubes, means responsive to the ilow of current in the main discharge gap of an operated tube for selecting the corresponding circuit for use, and an impedance element included in said common supply conductor, said impedance element having a relatively high inductive reactance and responsive to the ilow of current in said common supply conductor for producing an instantaneous voltage to prevent the remaining tubes from operating, said impedance element having a relatively low resistance to permit the flow of a. relatively high current over said supply conductor and through the main discharge gap of the operated tube.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measuring Volume Flow (AREA)
  • Devices For Supply Of Signal Current (AREA)
US377998A 1941-02-08 1941-02-08 Selecting system Expired - Lifetime US2326551A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL68615D NL68615C (en(2012)) 1941-02-08
US377998A US2326551A (en) 1941-02-08 1941-02-08 Selecting system
GB3424/42A GB549440A (en) 1941-02-08 1942-03-16 Selecting systems particularly for automatic telephones
CH237702D CH237702A (de) 1941-02-08 1942-08-26 Elektrische Wähleinrichtung.
FR938498D FR938498A (fr) 1941-02-08 1946-12-10 Système de sélection particulièrement pour téléphones automatiques
ES176359A ES176359A1 (es) 1941-02-08 1946-12-23 Un sistema selector de circuitos eléctricos
US37858A US2564125A (en) 1941-02-08 1948-07-09 Selecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US377998A US2326551A (en) 1941-02-08 1941-02-08 Selecting system

Publications (1)

Publication Number Publication Date
US2326551A true US2326551A (en) 1943-08-10

Family

ID=23491320

Family Applications (1)

Application Number Title Priority Date Filing Date
US377998A Expired - Lifetime US2326551A (en) 1941-02-08 1941-02-08 Selecting system

Country Status (6)

Country Link
US (1) US2326551A (en(2012))
CH (1) CH237702A (en(2012))
ES (1) ES176359A1 (en(2012))
FR (1) FR938498A (en(2012))
GB (1) GB549440A (en(2012))
NL (1) NL68615C (en(2012))

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542672A (en) * 1948-10-27 1951-02-20 Bell Telephone Labor Inc Coordinate selecting and lockout circuit
US2543534A (en) * 1947-01-09 1951-02-27 Stromberg Carlson Co Automatic telephone system
US2562100A (en) * 1948-11-17 1951-07-24 Bell Telephone Labor Inc Coordinate selecting and lock-out circuit
US2564125A (en) * 1941-02-08 1951-08-14 Bell Telephone Labor Inc Selecting system
US2578701A (en) * 1949-09-15 1951-12-18 Bell Telephone Labor Inc Coordinate selecting and lockout circuit
US2582959A (en) * 1947-10-29 1952-01-22 Bell Telephone Labor Inc Electron-tube controlled switching system
US2589697A (en) * 1945-11-12 1952-03-18 Ericsson Telefon Ab L M Telephone switch utilizing a multielectrode gaseous discharge tube
US2594389A (en) * 1948-08-04 1952-04-29 Bell Telephone Labor Inc Double-lockout interconnecting system
US2609454A (en) * 1948-06-29 1952-09-02 Bell Telephone Labor Inc Selecting and lockout circuit
US2633498A (en) * 1948-12-29 1953-03-31 Bell Telephone Labor Inc Selecting and two-way translating system
US2686226A (en) * 1949-10-13 1954-08-10 Int Standard Electric Corp Multiswitch apparatus controlled by crossbars
US2704786A (en) * 1949-05-02 1955-03-22 Telephone Mfg Co Ltd Automatic telephone-exchange systems
US2777014A (en) * 1954-03-08 1957-01-08 Ericsson Telefon Ab L M Device for connection of markers in automatic telephone systems

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564125A (en) * 1941-02-08 1951-08-14 Bell Telephone Labor Inc Selecting system
US2589697A (en) * 1945-11-12 1952-03-18 Ericsson Telefon Ab L M Telephone switch utilizing a multielectrode gaseous discharge tube
US2543534A (en) * 1947-01-09 1951-02-27 Stromberg Carlson Co Automatic telephone system
US2582959A (en) * 1947-10-29 1952-01-22 Bell Telephone Labor Inc Electron-tube controlled switching system
US2609454A (en) * 1948-06-29 1952-09-02 Bell Telephone Labor Inc Selecting and lockout circuit
US2594389A (en) * 1948-08-04 1952-04-29 Bell Telephone Labor Inc Double-lockout interconnecting system
US2542672A (en) * 1948-10-27 1951-02-20 Bell Telephone Labor Inc Coordinate selecting and lockout circuit
US2562100A (en) * 1948-11-17 1951-07-24 Bell Telephone Labor Inc Coordinate selecting and lock-out circuit
US2633498A (en) * 1948-12-29 1953-03-31 Bell Telephone Labor Inc Selecting and two-way translating system
US2704786A (en) * 1949-05-02 1955-03-22 Telephone Mfg Co Ltd Automatic telephone-exchange systems
US2578701A (en) * 1949-09-15 1951-12-18 Bell Telephone Labor Inc Coordinate selecting and lockout circuit
US2686226A (en) * 1949-10-13 1954-08-10 Int Standard Electric Corp Multiswitch apparatus controlled by crossbars
US2777014A (en) * 1954-03-08 1957-01-08 Ericsson Telefon Ab L M Device for connection of markers in automatic telephone systems

Also Published As

Publication number Publication date
FR938498A (fr) 1948-09-16
NL68615C (en(2012)) 1900-01-01
GB549440A (en) 1942-11-20
CH237702A (de) 1945-05-15
ES176359A1 (es) 1947-03-01

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