US2320076A - Selecting system - Google Patents

Selecting system Download PDF

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Publication number
US2320076A
US2320076A US419878A US41987841A US2320076A US 2320076 A US2320076 A US 2320076A US 419878 A US419878 A US 419878A US 41987841 A US41987841 A US 41987841A US 2320076 A US2320076 A US 2320076A
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United States
Prior art keywords
tubes
starting
voltage
gap
tube
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
US419878A
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English (en)
Inventor
Nathan I Hall
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 NL72717D priority Critical patent/NL72717C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US419878A priority patent/US2320076A/en
Application granted granted Critical
Publication of US2320076A publication Critical patent/US2320076A/en
Priority to FR951740D priority patent/FR951740A/fr
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, circuits, or other electrical devices.
  • an object of the invention is to increase the certainty with which lines, trunks, circuits, orl other devices oi a group are rendered unselectabie in response to the selection or one of them for use.
  • Another object is to cause the selection of one of av plurality oi equivalent circuits lor devices by operatingV a discharge tube individual thereto and to utilize the characteristics of these discharge tubes to insure that one alone is rendered efiective and that all others are rendered ineffective when a plurality of them are seized simultaneously.
  • Another object is to utilize a common impedance element for controlling the operating voltages applied to said tubes and to utilize a source of alternating or pulsating voltage for varying the characteristics of the tubes to insure the ef iective operation of one tube to the exclusion of the other.
  • a selecting system in which a plurality of lines, circuits, relays, or other equivalent devices, from which selection is to be made, are provided with a plurality of discharge tubes, one for each of the several circuits or devices, together with means forv causing the ionization or initial discharge of said tubes at random; in which the starting or ionizing voltage for each tube is applied through ajcommon impedance element; and in which a source of alternating or pulsating voltage is applied to the main discharge gaps of the tubes.
  • a selection system of this kind attempts to seize any two of the tubes, although subject to random occurrence, are more likely to fall in sequence than simultaneously.
  • a feature of the invention is a selecting system of the kind above described in which both electrodes forming the start gap of each tube are connected in direct multiple relation with the corresponding electrodes of all other tubes of the group.
  • Fig. 1 shows the invention applied to the selecswitching system
  • Fig. 2 illustrates the invention applied to the selection of the operating magnets of a crossbar switch.
  • the initial trolling circuits therefor usually include horizontal and vertical group relays which determine the order of sequence in which calling lines are served.
  • Fig. 1 shows a portion of the control circuits for one of these switches andillustrates a number ofthe horizontal group relays to which the selective and lock-out features of this invention are applied.
  • Fig. 2 shows the application of the selection and lock-out features of the invention to the select magnets of ⁇ one of the crossbar line switches.
  • a crossbar switch of the type to which reference is here made is disclosed in the patent to Reynolds 2,021,329 of November 19, 1935. l'I'he controlling and operating circuits of these switches, when used as line switches in an automatic telephone system, aredisclosed and de ⁇ scribed in detail in the patent to Busch et al. 2,224,251 of December 10, 1940.-
  • the subscribers lines which appear inV one of these line switches, are divided into a plurality of groups. Two of these groups of lines and
  • the usual practice is to divide the total number of lines into ten groups, in which case there would be ten group relays.
  • the windings of the group relays are connected respectively to the anodes of the tubes so that the relay obtains its operating current in the main discharge circuit of the tube.
  • 0 and are connected respectively to the anodes
  • the other terminals of the relays are multipled by a common conductor
  • 3, are connected in direct multiple relation by means of the common multiple conductor
  • the starting electrode of each tube is connected through contacts of the line relays of the corresponding group to a common supply circuit for applying starting voltage to the control gap of the tube.
  • 2 is connected in multiple to the front contacts of all line relays
  • 24 of tube i3 is connected through the front contacts of relays
  • 25, etc., of the voltage supply circuit include 4fuses
  • 21 of the supply circuit also includes a variable resistor
  • 1 is connected to a rectifier
  • the rectified voltage is thus applied to the supply conductor
  • the starting gaps of tubes "I i2 and Hl may commence to ionize at substantially the same instant, and the same might bek true of other tubes corresponding to groups having lines in a calling condition at this time. If these tubes were permitted to continue their ionization and to transfer the ionization from the control gaps to the main gaps at the same time, the result would be that a plurality of group relays
  • the tube H2 As the tube H2 lowers its sustaining voltage it draws more and more current from the common supply circuit
  • tube H2 transfers from the control gap
  • 2I-H8 remains ionized constantly under control of the line relay
  • the relay H0 operates in this circuit and remains operated during the brief lintervals of current cessation by reason of its slow-releasing character.
  • 06 is opened, or the circuit of the control gap
  • the opening of the circult for this control gap terminates the ionization thereof, and the main gap of the tube fails to ionize on succeeding alternations of the anode potential. After a brief interval the'relay'IIO releases.
  • comprising transformer I 3 4 and rectifying elements
  • 30 is one having a non-linear voltage resistance characteristic. 'Ihe resistance of this unit is relatively high under normal operating conditions and in combination with resistor
  • a Crossbar switch is partially illustrated for connecting incoming lines, such as the line 200, to outgoing lines or trunks 20
  • the horizontal orselect bars of the switch are operated by means of individual select magnets 203, 204, etc., there being one of these select magnets for each of the outgoing circuits 20
  • the individual discharge tubes 205, 206. etc. are provided for effecting the exclusion or lock-out of all magnets except the one chosen for operation.
  • 0, 2H of the tubes are connected respectively to the windings of the select magnets, and the other terminals of these windings are joined by the common multiple conductor 201 and connected to the alternating potential source 208 which in turn is connected in series to the negative pole of battery 209.
  • the battery 209 applies a negative potential to the anodes of the tubes to balance the negative potential applied to the cathodes by the battery 2
  • 3 are all connected directly in multiple to the common conductor 2 I4 and thence to the negaiivc pole of battery 2I5.
  • the lock-out tubes 205, 206 diller from those shown in Fig. 1 in that they are provided with separate or insulated control gaps.
  • the control gap of tube 205 is formed by a startingr anode 2I6 and a starting cathode 2I1.
  • the control gap of tube 206 is formed by a starting anode 2
  • 9 are connected respectively thro lf'resistors 220 and 22
  • These starting cathodes are also connected respectively to the sieeve conductors 221 and 225 of the outgoing circuits 20
  • 8etc., are connected directly in multiple by the common conductor 220, which includes in circuit therewith the common resistor 221 and the supply battery 228.
  • a relay 229 is operated in any suitable manner tof/close a circuit from the positive pole of battery 220 through the common resistance 221, contacts of said relay, thence to the starting anodes 2I6, 2IB of all tubes in the group.
  • , 202 will have full negativemdtential applied to the starting cathode thereof from the batteries 222, 223.
  • the ionization of the starting gap 2I6--2I1 transfers to the auxiliary starting gap ⁇ 2rI2-2I6.
  • the circuit for maintaining ionization of theauxiliary gap may be traced over conductor 226, starting anode 2I6, main cathode 2I2, conductor 2I4itofthenegative pole of battery 2I5, Similarly, the ionization of the starting gap 2I8-2 I9 of tube 206 may transfer at the same, time to the auxiliary starting gap 2I3-2I8.
  • the tube 205 transfers the ionization of the'starting gap to the main discharge gap 2
  • the magnet 203 causes the operation of the crossbar switch and the extension of the line circuit 200 to the selected idle outgoing circuit 20
  • 'I'he purpose of the rectifying unit 230 is to prevent the magnet 203 fromreleasing during sucessive alternations of the source ⁇ 208.
  • a ground potential is applied to the sleeve conductor 22B in any suitable manner to render the control gap 2
  • the relay 229 ⁇ is released to quench the ionized control gaps of alltubes.
  • space discharge.k tubes illustrated herein may be of any suitable type, such as those iilled with different gases, it has been found that better results are obtained in the systems disclosed when tubes lled with argon are employed.
  • a plurality of discharge tubes each having electrodes forming a starting gap and a main discharge gap
  • a common circuit for applying at randomy a starting voltage t-o cause the ionization of the starting gap ofone or more of said tubes
  • a source of alternating voltage applied to the main gaps of all of said tubes and serving to alter at different rates the sustaining characteristics of the starting gaps of any tubes that happen to ionize simultaneously
  • an impedance element in said common circuit for producing a voltage drop in response to the current owing in the starting gaps of i said tubes, the voltage drop of said impedance element serving to lower below the sustaining value the voltage applied to the starting gaps of all tubes except the particular tube that has its sustaining characteristic altered most rapidly by said alternating voltage.
  • a plurality of discharge tubes each having electrodes forming a starting gap and a main discharge gap, a common cir'- cuit for applying at random a starting voltage to cause the ionization of -the starting gaps o! a plurality of said tubes simultaneously, a source of alternating voltage applied to the main gaps of all of said tubes and serving to lower at different rates the sustaining voltage of the starting gaps of said tubes, and a resistance element in said common circuit for producing a voltage drop in response to the current owing in the f starting gaps of the ionized tubes, the voltage drop of said resistance element serving to lower below the sustaining value the voltage applied to the starting gaps of all tubes except the particular tube-that has its sustaining voltage lowered most rapidly by said alternating voltage.
  • a plurality of discharge tubes each having two starting electrodes forming a starting gap and a, main electrode forming a main gap with one of said starting electrodes.
  • a common circuit including in multiple relation one of the starting electrodes of each of said tubes, a common circuit including in multiple relation the other starting electrodes of each of said tubes, means for applying at random over said common multiple circuits a starting voltage to cause the ionization of the starting gaps of a plurality of said tubes simultaneously, a source of voltage applied to the main gaps of all of said tubes and serving to alter at different rates the sustaining characteristics of the starting gaps of the simultaneously ionized tubes, and an impedance element in one of said common circuits for producing a voltage drop in response to the current owing in the starting gaps vof said tubes, the voltage drop of said impedance element serving to lower below the sustaining value the voltage applied to the starting gaps of all tubes except the particular tube that has its sustaining voltage lowered at the highest rate.
  • a plurality of discharge tubes each having electrodes forming a starting gap and a main discharge gap, a circuit for the starting gaps of said tubes including a common branch and an individual branch for each tube.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
US419878A 1941-11-21 1941-11-21 Selecting system Expired - Lifetime US2320076A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL72717D NL72717C (en(2012)) 1941-11-21
US419878A US2320076A (en) 1941-11-21 1941-11-21 Selecting system
FR951740D FR951740A (fr) 1941-11-21 1947-08-07 Système de sélection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US419878A US2320076A (en) 1941-11-21 1941-11-21 Selecting system

Publications (1)

Publication Number Publication Date
US2320076A true US2320076A (en) 1943-05-25

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US419878A Expired - Lifetime US2320076A (en) 1941-11-21 1941-11-21 Selecting system

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US (1) US2320076A (en(2012))
FR (1) FR951740A (en(2012))
NL (1) NL72717C (en(2012))

Cited By (8)

* 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
US2582959A (en) * 1947-10-29 1952-01-22 Bell Telephone Labor Inc Electron-tube controlled switching system
US2609498A (en) * 1950-01-07 1952-09-02 Bell Telephone Labor Inc Pulse counting and registration system
US2609454A (en) * 1948-06-29 1952-09-02 Bell Telephone Labor Inc Selecting and lockout circuit
US2697140A (en) * 1949-12-20 1954-12-14 Bell Telephone Labor Inc Electronic testing system
US2818529A (en) * 1954-09-10 1957-12-31 Polarad Electronics Corp Light-actuated switching device
US3349187A (en) * 1963-02-01 1967-10-24 Int Standard Electric Corp Reed relay array
US3478175A (en) * 1965-11-09 1969-11-11 Int Standard Electric Corp Direct current signal receiver

Cited By (8)

* 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
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
US2697140A (en) * 1949-12-20 1954-12-14 Bell Telephone Labor Inc Electronic testing system
US2609498A (en) * 1950-01-07 1952-09-02 Bell Telephone Labor Inc Pulse counting and registration system
US2818529A (en) * 1954-09-10 1957-12-31 Polarad Electronics Corp Light-actuated switching device
US3349187A (en) * 1963-02-01 1967-10-24 Int Standard Electric Corp Reed relay array
US3478175A (en) * 1965-11-09 1969-11-11 Int Standard Electric Corp Direct current signal receiver

Also Published As

Publication number Publication date
FR951740A (fr) 1949-11-02
NL72717C (en(2012))

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