US2410050A - Telecommunication switching system - Google Patents

Telecommunication switching system Download PDF

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Publication number
US2410050A
US2410050A US532143A US53214344A US2410050A US 2410050 A US2410050 A US 2410050A US 532143 A US532143 A US 532143A US 53214344 A US53214344 A US 53214344A US 2410050 A US2410050 A US 2410050A
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US
United States
Prior art keywords
key
circuit
relay
contact
keys
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
US532143A
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English (en)
Inventor
Deakin Gerald
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 BE466588D priority Critical patent/BE466588A/xx
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to US532143A priority patent/US2410050A/en
Priority to GB5242/45A priority patent/GB596444A/en
Application granted granted Critical
Publication of US2410050A publication Critical patent/US2410050A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/924—Coupled nut and bolt
    • Y10S411/929—Thread lock
    • Y10S411/937—Distorted nut

Definitions

  • This invention relates to new and useful improvements in switching systems and, more particularly, to systems of the type 'disclosed in my copending application, Serial No. 532,142, ⁇ filed April 21, 1944.
  • the object of the present invention is to simplify the switching system ⁇ in which a set of ten keys are used for controlling a plurality of successive selecting operations,
  • a set of ten keys controls a single tube circuit in a register.
  • This circuit when operated, applies a series of ten potentials tothe grid of a triode in rapid succession, and causes it to operate when the proper potential is reached.
  • the return to normal of the depressed keys is controlled by a governor, and the speed of operation is limited to about four digits per second.
  • the arrangement is particularly useful for P. A. B. Xs having short lines of about 300 ohms.
  • Fig. 1 is a circuit diagram ofv a substation equipped with a key set utilizing the features of the present invention
  • Fig. 1a is a diagram by means of ⁇ which the theory of operation of the system willbe eluci dated;
  • Figs. 2-6a illustrate ⁇ the mechanical details of the key set; Fig. 2 being a cross section along lines 2-2 of Figy, Fig. 3 a cross section along lines 3 3 of Fig. 2, Fig. 4 an end View with parts broken away, Fig. 5 a detail of the contact actuating mechanism, Figs. 6 and 6a illustrating diagrammatically the contact arrangements controlled by keys 1-5 and 6 0, respectively, and
  • Fig. '7 shows as much of a register controller ⁇ as is necessary for an understanding of thepresent invention.
  • the home contact nest When any button is depressed, the home contact nest operates, first opening the receiver circuit at 22, then shorticircuiting the transmitter circuit at 23, and nally removing the shortcircuit from the key set at 24.
  • the key set assembly mounts in the subscriber's set.
  • plunger 26 forces with its inclined surface 2l, a sliding bar 2S to the right, thus opening home contacts 22 and 23, as above-described.
  • Part V29 attached to the plunger by rivet 30, engages friction wheel 3l, molded-or otherwise: attached' to a rotatable shaft 32, carrying. a ⁇ friction ⁇ disc33, rubbing. against spring ⁇ 3.4. This ⁇ friction control serves no useful purpose on the downward stroke.
  • pin 35 slips oi the upper lip of spring 38, which returns and makes contact with spring 3l, but spring ⁇ 36 is now engaged by pin 35, and contact 2l is held open to introduce the resistor in the circuit until the plunger commences to restore the home contact to normal.
  • the system is :arranged to allow the operation of three keys per second.
  • RBR applies high tension battery to the electrical discharge device comprising triodes V1 and 'V2 and gas valve GV, and closes the primary side of thedialing tone circuit, the secondary side of which is bridged across the calling line.
  • AR operates slow releasingrelay RIR, which remains energized during the subsequent operation cf the register circuit.
  • the register circuit remains in this condition until the subscriber depresses a key button.
  • AR closes the starting circuit of a step-by-step operating device comprising a set of counting relays CR from ground, back GVR, front BR, back AR, 4
  • CRI operates CRZ, thus placing the potential P normally on the back contact of CRS on the grid of Vl.
  • the tube circuit now operates in the usual way, lights GV'which energizes GVR.
  • the starting circuit is opened before CRS has time to operate.
  • GVR When GVR makes its front contact, it energizes the corresponding XR relay, circuit from ground, front GVR, back AR, front CRI, front CR2, back CR3, back TRI, winding XR3 to battery.
  • GVR operates GSR.
  • GSR operates AR and opens the high tension circuit, thereby releasing GVR and de-ionizing GV.
  • AR locks up to the calling line and opens the operating circuit of XR3 which now locks upover a front contact in series with VTRI and front RCR.
  • TRI operates and transfers the counting relay control to the next set of XR relays.
  • AR opens the back contact circuit of GVR so that the counting relay circuit is not again energized when GVR makes its back contact.
  • All counting relays are made slightly slowreleasing so as to allow time for the energization of the XR relays.
  • Resistor R2 to ground at the back contact of GVR is provided to reduce sparking when the common counting relay holding circuit is opened. It is not sucient to retain even one CR relay energized.
  • GSR is made slow enough to retain AR energized until the key plunger is restored to normal and the line circuit again closed.
  • F is a filter to prevent improper operation of the triodes by the dialing tone or the like.
  • out-trunk calls may be made in one of two ways, either by installing an ordinary dial on the subscribers set for those stations permitted to make/out-trunk calls, or by adapting the P. A. B. X register circuit to convert ten-button pulses into dial or other types of pulse required to operate the central oice equipment.v
  • a controller having a plurality of operating positions, a source of current, a multi-electrode discharge device, means for establishing a connection between said controller and said device, a relay, means for operating said relay when potentials applied to two electrodes of said device bear a predetermined relationship to one-another, means including said connection for applying a different potential to one electrode in each position of the controller.
  • a controller having a pluralityl of operative positions, asource of current, a responsive device, means for applying a different potential to the responsive device in each position of the controller, step-by-step means for applying different potentials to the responsive device, means for operating the step-by-step means when the controller is actuated, a relay operated when thepotentials applied to the responsive device bear a predetermined relation to one-another, and switching devices variably oper able under the control of said relay and step-bystep means.V
  • step-by-step means comprises a set of counting relays having contacts for applying said potentials.
  • controller comprises a plurality oi' keys and a corresponding number of resistances, one for producing each operating position', and means responsive to the association of any key for starting the step-bystep means to operate.
  • controller comprises a plurality of keys and a corresponding number of resistances, one for producing each operating posi-S tion, and means responsive to the actuation of any key for starting the step-by-step means to apply one potential after the other;
  • a controller having a plurality of operating positions, a current source, a pair of triodes, means for establishing a connection Ybetween said controller and said-triodes, a relay, means for operating saidrelay ⁇ when the potentials applied to the grids of the two triodes bear a V.predetermined relationship to one-another, means ior applyingT a different potential to the grid of the rst triode in each ⁇ position of the controller, step-by-step means controlled by.
  • said relay for applying different potentials to the grid of thesecond triode, means actuated by the controller for'starting the operation of the step-bystepmeans, and a plurality Aof digit storage devices variably operableunder the ⁇ control of'sai relay and step-'by-step means.
  • a controller comprising a set oi keys, one for each operating .position of the controller, a current source, a pair of triodes, means for establishing'a connection between said controller and said triodes, a ⁇ resistance for each key switched into the connection when the key is operated, a relay, means for operating said relay when the Vsaine potentials are applied to the grids of the two triodes, means including said resistances for applying a different potential to the grid of the first triode in response to the operation of each key, step-by-step means controlled by said relay for applying said different potentials, one after the other, to the grid of the second triode, means actuated by the controller for starting the operation of the step-by-step means, and a plurality of storage devices variably operable under the control of said relay and stepby-step means.
  • a controller having a plurality of operating positions and operable in accordance with successive digits of a number, a D. C. source, a pair of triodes, a relay, means for operating said relay when the same potentials are applied to the grids of the two triodes, means for applying a different potential to the grid of the rst triode in each position of the controller, means including a set of counting relays controlled by said relay iorapplying said different potentials, one after the other, to the grid of the second triode, means actuated by the controller for starting the operation of the counting relays, and a storage device for each digit variably operable under the control of said relay and counting relays.
  • a normally inactive controller comprising a set of ten keys operable in accordance with a plurality of successive digits, a D. C. source, a pair of triodes, a two-wire circuit connecting the controller with the triodes, a relay, a gas valve for operating said relay when the same potentials are applied to the grids of the two triodes, a different resistance switched into the circuit by each key for applying ten different potentials to the grid of the first triode, means including a set of counting relays controlled by said relay for applying said ten different potentials, one after the other, to the grid of the second triode, means actuated by the actuated key for starting the operation of the counting relays, and a storage device for each digit variably operable under the control of said relay and counting relays.
  • a controller having ten operating positions and ⁇ comririsinga key Afor each position and movable ⁇ from a normal to an actuated lposition and returnto normal, a twowireline circuit, ten different resistances, one for each key, in series in thecircuit, a first contact for each key and a second contact 'for ve of the keys; the contacts of each keyfnormally short-circuit# ing the associated resistance, means controlled Vby eachA key for opening its nrst contact substantially throughout its return movement, means controlled by said iive keys for opening their second contacts ⁇ only during the beginning of the return movement, a4 device connected with the line circuit and comprising a iirst means responding once to the actuation of any key, a second means' variably operated dependent on the .key actuated; anda switching device jointly controlled bythe first and second means.
  • nrst means comprises an electric discharge device having an electrode con-- nested with the circuit and responding onceV dur'- ing the return movement of each key.
  • a controller having ten operating positions and comprising a key for each position and movable from a normal down to an actuated position and return up to normal, means for governing ⁇ the speed at which said keys move, a two-wire line circuit, ten different resistances, one for each key, in series in the circuit, a first contact for each key and a second Contact for live of the keys, the contacts of reach key normally short-circuiting the associated resistance, a
  • a controller having a plurality of operating positions and comprising a key for each position and movable from a normal to an actuated position and return to normal, a line circuit, a plurality of different resistances, one for each key, in series in the circuit, a rst contact for each key and a second contact for some of the keys, the contacts of each key normally short-circuiting the associated resistance, a contact set, means operative upon the actuation of any key and while any key is off-normal to remove ⁇ a, short-circuit around all the keys by operating the contact set, means controlled by each key for opening its first contact substantially throughout its return movement, means controlled by said some keys for opening their second contacts only during part of the return movement, a source of D.
  • a responsive device connected with the line circuit and comprising a rst relay bridged across the line circuit and adaptedl to be rie-energized when the circuit is'opened in the two contacts of any of said some keys and also when connected in series with any one of the resistances associated with the other keys, an electric ldischarge device, a path closed to the device over a back contact of said relay from said circuit, a step-by-step means, a potentiometer across said source having a plurality of taps, contacts controlled byy the step-by-step means for connecting a diierent tap with the device, a starting circuit for Said step-by-step means controlled by said relay, a second relay operated when the same potentials are applied to the device, and an impulse storing device controlled by the second relay and the step-by-step means.
  • a controller having ten operating positions and comprising a key for each position and movable from a normal down to an actuated position vand return upto normal, means for governing the speed at which said keys move, a two-wire line circuit, tendifferent resistances, one for each key, in series in the circuit, a first contact for each key anda second contact for ve of the keys, kthe contacts of each key normally short-circuiting the associated resistance, a contact set, means operative upon the actuation of any key and while any key is off-normal first to open in said contact set the short-circuit around all the keys,
  • each key for opening its rst contact substantially throughout its return movement
  • means controlled by said ve keys for opening their second contacts only during the beginning of the return movement
  • a source of D.'C. for the line circuit a responsive device connected with the line circuit and comprising a first relay operated when the circuit is opened in the two contacts of any of said ve keys and also when connected in series with any one of the resistances associated withthe other keys, an electric discharge device, a path controlled by said relay to said circuit from said device, other means controlled by said relay for applying different potentials one after the other to said device, a second relay operated when the potentials applied to the device bear a predetermined relationship to one-another, and a switching device controlled by the second relay.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Push-Button Switches (AREA)
US532143A 1944-04-21 1944-04-21 Telecommunication switching system Expired - Lifetime US2410050A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE466588D BE466588A (en)) 1944-04-21
US532143A US2410050A (en) 1944-04-21 1944-04-21 Telecommunication switching system
GB5242/45A GB596444A (en) 1944-04-21 1945-03-02 Telecommunication switching systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US532143A US2410050A (en) 1944-04-21 1944-04-21 Telecommunication switching system

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US2410050A true US2410050A (en) 1946-10-29

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US532143A Expired - Lifetime US2410050A (en) 1944-04-21 1944-04-21 Telecommunication switching system

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GB (1) GB596444A (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005055A (en) * 1957-10-08 1961-10-17 Bell Telephone Labor Inc Tilting dial circuit selector
US3441679A (en) * 1965-09-22 1969-04-29 Bell Telephone Labor Inc Potential sensing pbx class-of-service selector circuit
US3466404A (en) * 1964-11-18 1969-09-09 Siemens Ag Pulse transmission arrangement for telephone systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005055A (en) * 1957-10-08 1961-10-17 Bell Telephone Labor Inc Tilting dial circuit selector
US3466404A (en) * 1964-11-18 1969-09-09 Siemens Ag Pulse transmission arrangement for telephone systems
US3441679A (en) * 1965-09-22 1969-04-29 Bell Telephone Labor Inc Potential sensing pbx class-of-service selector circuit

Also Published As

Publication number Publication date
GB596444A (en) 1948-01-05
BE466588A (en))

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