US2676211A - Circuit-arrangement in automatic signaling system - Google Patents

Circuit-arrangement in automatic signaling system Download PDF

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Publication number
US2676211A
US2676211A US165419A US16541950A US2676211A US 2676211 A US2676211 A US 2676211A US 165419 A US165419 A US 165419A US 16541950 A US16541950 A US 16541950A US 2676211 A US2676211 A US 2676211A
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United States
Prior art keywords
potential
circuit
tube
mark
electrode
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Expired - Lifetime
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US165419A
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English (en)
Inventor
Buchner Robert Bertold
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication of US2676211A publication Critical patent/US2676211A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • This invention relates to a circuit-arrangement in automatic signalling systems, for example, telephone systems, for testing the potential of a mark point, to which other similar testing circuits have concurrent access, and for engaging the mark point engaged.
  • Such circuit-arrangements are used inter alia for setting a selector switch to a free outlet corresponding to the desired number, or for setting a line finder to the outlet of a calling 1ine.
  • the testing circuit then forms part of the control-circuit of the switch. In these cases mark contacts of the desired outlets are marked by a potential different from those of unwanted outlets.
  • the circuit tests the potentials of the mark contact and stops the switch as soon as a desired outlet is found.
  • the outlet is subsequently marked engaged by varying the potential of the mark contact. Since the mark contacts of the switch are multipled to corresponding contacts of other switches, the same marking potential may be tested simultaneously by more than one testing circuit. It is desirable that the test should be followed as rapidly as possible by engagement of the outlet to prevent a plurality of switches from being adjusted to one and the same outlet.
  • a circuit-arrangement of the above-described type may also be used to test whether a definite, common apparatus, for example, a marking circuit in a cross-bar system, or a device for recording calls is free or busy.
  • the invention provides in more simple form a circuit-arrangement which has the same advantages as the last-mentioned circuit.
  • the circuit according to the invention comprises a discharge tube having a cathode, a control-electrode, a first collecting electrode and a further collecting electrode, the surface of which has a secondary-emission factor exceeding unity. Provision is furthermore made of means for connecting the mark point to the cathode of the tube. Through at least one resistance the additional collecting electrode has to it applied a potential which exceeds that of the cathode and which, at least when the tube is'not conductive, is lower than the potential of the first collecting electrode.
  • the control-electrode is coupled to the additional collecting electrode and, in the non-conducting state of the tube, it has such a potential that the tube does not become conductive.
  • the tube becomes conductive, however, if the mark point is free and thus has a comparatively low potential.
  • the potential of the additional collecting electrode increases and that of the control-electrode rises too so that the resistance connected to the mark point is traversed by such a current that the mark point is engaged.
  • the control-electrode and the additional collecting electrode are preferably connected to various taps of a potentiometer connected between two points having fixed potentials.
  • circuit-arrangement according to the in vention is particularly suitable for use in a resistance-testing circuit as described in U. S. A. patent application Serial Number 163,170, filed May'20, 1950. r I r r
  • a circuit-arrangement for setting a selector switch e. g. a group selector to a desired free outlet is shown a simplified and diagrammatical form by way of example.
  • Reference numeral K1 designates a selector switch, of which only the test wiper S1, its associated mark contacts and the rotary magnet Dlvl are shown.
  • the mark contacts are connected through resistances R1, R2 to a voltage source V1 having a potential of, say, -60 v. relative to earth.
  • the mark contacts are multiplied to corresponding mark contacts of other switches, for example K2.
  • the control-device of switch K1 comprises a discharge tube B having a cathode K, a controlgrid 9, an anode a and an auxiliary collecting electrode S, the surface of which has a secondaryemission factor exceeding unity.
  • the control-grid g and the auxiliary collecting electrode S are connected to taps I and 2 of the potentiometer R4R5Rs connected between the voltage sources V1 and V2.
  • the anode circuit of tube B comprises a relay T, of which the break contact ii is included in the energizing circuit of the rotary magnet DM.
  • the switch K1 selects a free outlet within the group under the control of the control-circuit.
  • the cathode of B is connected, if desired, by way of switches in preceding selector stages, to the test wiper S1 of switch K1, and contact is closed.
  • Tube B is cut off at this instant and contact i1 is closed, so that the rotary magnet DM is energized and the switch K1 is actuated.
  • the mark contacts of free outlets have a potential of -60 v., whereas the mark contact of a busy outlet is connected to earth through the test wiper S2 of a switch K2, by way of which the speech channel passes and a relay contact r.
  • the tap l of potentiometer R4R5Bs is chosen such that in the non-conductive state of tube B the control grid has a potential of, say, --30 V. As long the test arm S1 is in contact with mark contacts of busy outlets, tube B remains cut off, since the control grid has a potential exceeding by 30 v. that of the cathode.
  • the tube becomes conductive.
  • the control-grid of B has a potential of so v.
  • the voltage drop across the resistance connected to the mark contact would result in an increase in potential of the cathode to a few volts in excess of -30 v., for example to -27 v.
  • the outlet would then not be marked engaged, since the tube of the control device of a further switch reaching the same outlet at this instant would also become conductive.
  • the tube B thus becomes more conductive and the potential of the cathode follows substantially that of the control grid. Consequently the cathode assumes a potential such that the outlet concerned is marked engaged.
  • relay T is energized and the break contact t1 interrupts the energizing circuit of the rotary magnet DM, so that switch K1 stops.
  • controlgrid g may be coupled to the collecting electrode S, through a battery instead of through the potentiometer RsRs connected between the S and V1.
  • the inductance constituted by relay T in the anode circuit of the tube may give rise to undesirable eiiects.
  • a voltage pulse might, for example, be produced across the inductance that the anode potential drops below the potential of the secondary-emission electrode S.
  • the secondary-emission electrons cannot be carried off and the process is delayed. This may be avoided by providing the tube with a separate screen grid, the potential of which exceeds that of the electrode S.
  • the rotary magnet DM may be included in an output circuit of a separate discharge tube, a control-electrode of which is coupled to a point on the anode circuit of tube 13.
  • the relay T can be dispensed with and the anode circuit of tube B may include a resistance for example in a manner described in the above identified copending application S. N. 66,679.
  • the range of application of the circuit-arrangement according to the invention is not limited to the control of the switches.
  • the trigger circuit may be used with advantage in a circuit arrangement as proposed in U. S. A. patent application Serial Number 163,170, filed May 20, 1950.
  • a circuit for testing the potential of a mark point, the mark point when free presenting a potential which is low relative to its potential when busy comprising an electron discharge tube having a cathode, a grid, an anode and an emissive collecting electrode having a secondaryemission factor exceeding unity, means connecting said mark point to said cathode, means to apply a potential to said anode having a value which is high relative to the mark point potential on said cathode, means to apply a potential to said grid having a value relative to the potential on said cathode at which said tube is maintained non-conductive at a busy mark point potential and is rendered conductive at a free mark point potential, a resistance, means to apply a potential to said additional electrode through said resistance having a value exceeding that on said cathode and in the non-conductive state of said tube lower than that on said anode, and means coupling the additional electrode to said grid, whereby in the conductive state of said tube the potential on said additional electrode increases and

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Particle Accelerators (AREA)
  • Lasers (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US165419A 1949-06-14 1950-06-01 Circuit-arrangement in automatic signaling system Expired - Lifetime US2676211A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL285636X 1949-06-14

Publications (1)

Publication Number Publication Date
US2676211A true US2676211A (en) 1954-04-20

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ID=19782499

Family Applications (1)

Application Number Title Priority Date Filing Date
US165419A Expired - Lifetime US2676211A (en) 1949-06-14 1950-06-01 Circuit-arrangement in automatic signaling system

Country Status (6)

Country Link
US (1) US2676211A (de)
CH (1) CH285636A (de)
DE (1) DE833372C (de)
FR (1) FR1020074A (de)
GB (1) GB686128A (de)
NL (1) NL146973B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835740A (en) * 1954-02-26 1958-05-20 Philips Corp Arrangement of subscriber's line circuits

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271418A (en) * 1938-10-26 1942-01-27 Rca Corp Frequency-changing circuit
US2354682A (en) * 1943-05-06 1944-08-01 Int Standard Electric Corp Electric selection controlling circuit
US2548673A (en) * 1945-05-04 1951-04-10 Siemens Brothers & Co Ltd Marker control apparatus for group selectors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271418A (en) * 1938-10-26 1942-01-27 Rca Corp Frequency-changing circuit
US2354682A (en) * 1943-05-06 1944-08-01 Int Standard Electric Corp Electric selection controlling circuit
US2548673A (en) * 1945-05-04 1951-04-10 Siemens Brothers & Co Ltd Marker control apparatus for group selectors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835740A (en) * 1954-02-26 1958-05-20 Philips Corp Arrangement of subscriber's line circuits

Also Published As

Publication number Publication date
NL146973B (nl)
FR1020074A (fr) 1953-02-02
GB686128A (en) 1953-01-21
DE833372C (de) 1952-03-06
CH285636A (de) 1952-09-15

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