US2287613A - Key pulsing sender for telephone systems - Google Patents

Key pulsing sender for telephone systems Download PDF

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Publication number
US2287613A
US2287613A US330158A US33015840A US2287613A US 2287613 A US2287613 A US 2287613A US 330158 A US330158 A US 330158A US 33015840 A US33015840 A US 33015840A US 2287613 A US2287613 A US 2287613A
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US
United States
Prior art keywords
contacts
relay
relays
circuit
condenser
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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
US330158A
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English (en)
Inventor
George C Hartley
Glyn D H Griffith
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
Western Electric Co Inc
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Filing date
Publication date
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
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Publication of US2287613A publication Critical patent/US2287613A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/272—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial

Definitions

  • This invention relates to electrical storage and control equipment, for instance, telephone operators digital key sender equipment.
  • the object of the present invention is to render such equipment more flexible in operation.
  • the circuit is associated with a number of manual board cord circuits via an intermediate dialing circuit (not shown) of known type
  • the loop circuit LP is connected to two make-beforebreak contact springs of a relay KS in the dialing circuit.
  • Relay KS is not shown but is connected to lead KSL.
  • the front contacts of the KS springs are commoned to the dial key contacts of said circuits. To set up a call the operator inserts the calling cord in the required outgoing jack, and throws the dial key. This is without eifect as the KS contacts are open. The operator now keys the number required.
  • Relay KS switches through the calling loop to the sender so that ST holds to the feed current.
  • Relay ID energizes via ssd, stl.
  • 'Relay M operates via 3]5, a3, 62, 03, (12, e3, f2, 93, n3, stB, SM, 003.
  • Relay A then energizes via ml, I23, 113, f3, bbZ, 72,3, st6, sfl, 003.
  • Contacts M to a8 connect a group of condensers CG! to the keystrip, and one of them will receive a charge. This charge will be negative for digits 1 to 5 and positive for the digits 6 to 0.
  • DK operates again, holding BB, BR on their second windings over bbl, dk3 and releasing AA.
  • DK releases again, it releases BB and BB.
  • relays BB and BR are operated for the second, fourth, sixth and eighth digits,
  • BB and BB are used to actuate the main group switching train, and their contacts M23, b174, 1113, M4, M5, are used to switch the charging leads from the keys to the odd or even banks of the condenser groups CGI to CG8.
  • the main group switching train consists of eight switching relays A to H and one guard relay M. Its operation is as follows. As set out above, ST operates when the first digit key is depressed, and earth is extended to M, which operates and completes a circuit for A, which also operates. A locks on its upper winding via a3 and releases M. When BB operates on release of the first digit key,'earth is placed on the lower winding of B via a2, 02, e2, g2, 12192, M, 8156, si l, 003. B operates and locks via 222 to the earth which it disconnects from A. A releases.
  • the circuit is set to start sending on the release of the key storing the eighth digit, but provision is made to enable the sender to start sending when three, four, five, six or seven digits have been keyed.
  • a start sending key (not shown) is provided in the cord circuit to enable fewer digits than the possible maximum to be sent.
  • relay SP is operated either from the operators send key via lead SSKL, or via contacts hi, b1'i. "When the eighth digit key is restored SF locks via sj2, st2, esl. One of the relays A to H will be operated, and holds to earth via change-over contacts SM. When SF operates, this earth is removed, and a 10 ohm battery via YG, cs5 substituted.
  • Contacts sf5 disconnect relay M, and prepare a circuit for DS; earth, back contacts cs6, DS, back contacts ds3, act-2, front contacts sf5, back contacts a3, b2, 03, d2, e3, f2, 93, k3, sit, 8M, sss, YG, battery.
  • DS has a high resistance to ensure the release of the relays A to H, as they get a temporary circuit in parallel with YG during release. DS operates when the relays A to H and AA are back, and operates SS, starting the sending.
  • Contacts ds l to 0188 disconnect the keystrip from the condensers, and contacts @182 transfer the control of DK to make contacts ppl, Z3.
  • Sending and which maintains the I has three contacts; break contacts il to send the impulses out, change-over contacts 22 to synchronize the operation and release of ID, and change-over contacts i3 to actuate the impulse counting train.
  • This train consists of four relays, three of which, X, Y, Z, count the first five impulses, the fourth, W, being used to count the sixth while X, Y and Z release, preparatory to counting the remaining four impulses as described below.
  • the relays X, Y, Z, W also connect the sensitive relays P and N to each condenser of a group in turn, so that the group is tested in sequence.
  • X, Y, Z, W are operated by the current produced in one winding when the charge on a 2 microfarad condenser QA is reversed by the operation of I.
  • This current operates their contacts 104, x5, g5, 25, only and their operation is completed on their second windings, the relays looking to earth on cs5.
  • relay Z is energized and locks, releasing Y, and the third condenser is tested.
  • Relay X is again connected to QA and when I is energized for the fourth impulse X reopcrates and locks via x5, 26.
  • the fourth condenser is connected to relays N, P via id4, wl, yl, 23 and tested.
  • the fifth impulse operates Y which also looks up without releasing X or Z, and the fifth condenser is tested via .22, 113, m3, wZ, id5.
  • N or P When the charged condenser of CGI is found, N or P energizes according to the polarity of the charge.
  • the rectifier arrangement shown for these relays is designed to provide individual inductive circuits for the relays, whereby discharge via one relay will not set up current flow via windings of both relays and their rectifiers in series.
  • Relay N has a circuit via RCI, RC3 independent of relay P which likewise has an individual circuit via RC4.
  • the condensers can be charged positively or negatively, as explained above. If there is a negative charge on any of the five condensers, N operates and locks in series with NN via nl, s53, idZ, Zl. K operates via 22, mil, stl. NN releases X, Y, Z. K prepares a circuit for ID which is completed via i2, kl, stl when I releases. ID operates, and locks via idl, kl, shorting the impulsing loop at id! and disconnecting the condenser groups at idd, M5, M6. ID also releases N and NN, operating L via k2, nnl.
  • the seventh impulse is directed via 24, w3, r 1, yd, ppZ to Y; the eighth impulse is directed to Z, which releases Y; the ninth operates X; while the tenth reoperates Y. While these last four impulses are being sent, W is operated, and connects a negative potential via YD, 102 in place of the fifth condenser.
  • N is operated, operating NN.
  • NN releases X, Y, Z, W, and operates K, which, as before, prepares a circuit for ID over back of 2'2.
  • ID operates when I releases, looking over the front of kl, shorting the impulsing loop at 2121, and disconnecting the condensers.
  • ID releases N and NN, which operates L, and substitutes for the fifth condenser a positive potential.
  • K holds in series with L via k2, nnl, stl.
  • AA locks in series with BB and BR, and B energizes via a2, 02, e2, g2, 11b2, 71.3, $126, sfd, cc3, and releases A. Relays BB, BR and B switch in the second group of condensers CG2 to be tested for the next digit.
  • N and NN are operated at the end of the interdigital time via 102, K is first released, and ID is held over a front of 2'! till I releases, when ID is dropped.
  • ID connects the testing relays N, P to the second group of condensers, removes the short-circuit from the impulsing loop, and releases N and NN.
  • NN releases L which had held on release of K via operated contacts Z2, nnl, stl, and restores the circuit for X, Y, Z, W, which, under the control of I, start testing the next group of condensers.
  • a bank of eight condensers SC is provided, one for each group of condensers, which are charged positively if a digit has been stored in the respective group of digit condensers. These condensers are charged via dlcZ, ss5, the condensers being connected up in turn by contacts of ER and relays A to H.
  • the corresponding condenser SC is connected to relay Q. If a digit has been stored in that group, Q will operate to the charge on the pilot condenser SC, locking via st3, id3, ql.
  • Relay CC is slow to release, so that the locking earth for A to H relays which was removed by 003 is not replaced until a small interval after their release by CB.
  • Contacts cs3 remove the circuit for KS in the dialing circuit which releases, removing the loop from the sender.
  • Contacts esl open the looking circuit for SF, which releases, dropping ST. ES then releases. The circuit is now free.
  • a cancel key (not shown) is provided to enable the operator to cancel any digits stored or being sent. When depressed it operates ES via lead CKL and the circuit cancels and returns to normal.
  • control equipment comprising a plurality of registering devices, means for setting up registrations on certain of said registering devices, an impulse transmitter, means for placing said impulse transmitter under the control of said registering devices in turn, testing means, and means operated in response to the completed control of said impulse transmitter by each of said registers to render said testing means effective to determine whether a registration exists on the next registering device.
  • control equipment as claimed in claim 1 in which means is provided under the control of said testing means to restore said control equipment to normal when no registration exists on the tested registering device.
  • control equipment as claimed in claim 1 characterized by a counting device, means to operate said device in accordance with the number of registering devices on which registrations are set up, and means to operate said testing means under the control of said counting means.
  • control equipment comprising a plurality of groups of condensers, said groups of condensers identified as odd or even, means to charge the condensers of a group to establish registrations thereon, means to transmit impulses, a relay chain including one relay for each of said groups of condensers, means under the control of each relay to connect the corresponding group of condensers to said charging means or to said impulsing means, means to successively operate said chain of relays, two of said relays remaining operated at the same time, a change-over relay device, means to operate said changeover relay device prior to the operation of each chain relay, and means under the control of said change-over relay device to render only one of said chain relays efiective 6.
  • control equipment comprising a plurality of groups of condensers, means to establish a positive or negative charge on one condenser of a group to set up a registration, impulse transmitting means, means to control the number of impulses sent out by said transmitting means in accordance with said registration comprising two detector relays, a unidirectional current carrying device in series with one of said detector relays, an oppositely directed unidirectional current carrying device in series with the other said relay, means to connect said detector relays in parallel to the condensers of a group in turn, means under the control of one of said detector relays to terminate said impulse transmission, and means under the control of said other detector relay to cause the transmission of a predetermined number of additional impulses and to operate said one detector relay independent of said condensers.
  • control equipment comprising a plurality of groups of condensers, means to establish a positive or negative charge on one condenser of a group to set up a registration, and means to determine said registration, comprising two detector relays, oppositely directed unidirectional current carrying devices in series with said relays, means to connect said detector relays in parallel to the condensers of a group in turn, and means to prevent interaction between said detector relays comprising an oscillatory circuit for each of said detector relays 10 independent of the other detector relay.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Relay Circuits (AREA)
  • Devices For Supply Of Signal Current (AREA)
US330158A 1939-05-02 1940-04-17 Key pulsing sender for telephone systems Expired - Lifetime US2287613A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13106/39A GB528690A (en) 1939-05-02 1939-05-02 Improvements in or relating to electrical signal storage equipment

Publications (1)

Publication Number Publication Date
US2287613A true US2287613A (en) 1942-06-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US330158A Expired - Lifetime US2287613A (en) 1939-05-02 1940-04-17 Key pulsing sender for telephone systems

Country Status (3)

Country Link
US (1) US2287613A (enrdf_load_stackoverflow)
BE (1) BE476928A (enrdf_load_stackoverflow)
GB (1) GB528690A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3025358A (en) * 1958-04-08 1962-03-13 Jr Francis Benedict Hymel Automatic dialing system
US3159820A (en) * 1958-11-24 1964-12-01 Int Standard Electric Corp Information storage device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3025358A (en) * 1958-04-08 1962-03-13 Jr Francis Benedict Hymel Automatic dialing system
US3159820A (en) * 1958-11-24 1964-12-01 Int Standard Electric Corp Information storage device

Also Published As

Publication number Publication date
BE476928A (enrdf_load_stackoverflow)
GB528690A (en) 1940-11-05

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