US1058903A - Telephone-exchange system. - Google Patents

Description

J. N. REYNOLDS. TELEPHONE EXCHANGE SYSTEM. AIPILIOATION IILIED JULY 8, 1911.

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Patented Apr.15, 1913.

S %MJA y J. N. REYNOLDS. TELEPHONE EXCHANGE SYSTEM.

A PPLIOAT ION FILED JULY 8, 1911.

Patented Apr. 15,1913.

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man? a I lllill UNITED STATES PATENT oEEIoE.

JOHN NEWBERRY nnYNoLns,

, ELECTRIC COMPANY, OF

or GREENWICH, CONNEcTIcUT; AssIGNon T0 WESTERN NEW YORK, N. Y., A CORPORATION or ILLINOIS.

TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application filed July 8, 1911. Serial No. 637,435.

Te-ell whom it may concern Be it known that I, JOHN NEWBERRY R Y- NoLos, citizen of the United States, residing at Greenwich, in the county of Fairfield and State of Connecticut, have invented a certain new and useful Improvement in Telephone-Exchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to switch control-' ling systems and has for its object to provide a controlling circuit for revertive control power driven automatic switches such as are used in telephone exchange systems of the full automatic or semi-automatic type. It has been found particularly useful in automatic switches of the panel type in which an interrupter or commutator is associated with the switch, and sends back to the controller or sender an impulse for each pendently making and breaking said circuit.

I which the'ca'll desired A circuit for initially energizing said relay may be under the control of a sender, upon is registered, and so arranged as to be closed only when the sender is set', and opened again upon its return to normal. Preferably both the power applying circuit and the looking or shunt circuit are controlled at a front contact of said relay. Theinterrupter may be in the form of a commutator segment with its arm supported and moving with the brush rod for a completedisclosure of which reference is made to my copending application, No. 637,43 L'filed July 8, 1911. During unit selection the advantage gained by this arrangement is that when the commutator arm' leaves the commutator segment corresponding to'the desired line terminal, and in so doing opens the shunt circuit, the power applying relay is rendered inert, since the alternative circuit-the line circuit was opened at-the sender immediately upon the latters return to normal. Further, since the shunt circuit leads througha front con- Serial tact and armatureof said power applying relay, it cannot be completed again toactuate said relay and cause it to complete the circuit for the power magnet, iffor any reason the brush arm should again make contact with a commutator segment. 'This arrangement is also useful during the brush selecting range of the commutator to pre- 'vent the brush rod from 'stoppingbelow a point where, a tooth of its holding rack will come into engagement with its retaining pawl. It maintains the power magnet energized after the commutator armpasses beyond a commutator segment Included in the. lockuntil the locking circuit is opened ing circuit,and so arranged in relation to a the rack and pawl as to maintain the power applying relayclosed up to a point where a tooth will surely be engaged when the power circuit is broken.

Referring-to the drawings Figures 1 and 2 illustrate the controlling system of my in ventio-n, Fig. 1 representing the sending ap.. paratus or controller, and Fig. 2 theselector. l

controlled by such sender. The selector shown 1s capable of making connection w1th any one of five hundred lines and is controlled by a sender having hundreds, tens and units registers. The depresslon of a key of each of the registers grounds corresponding contact po nts and M, M and M and causes the respective finder brushes to move directly and rapidly to the grounded point Where they are stopped abruptly and with precision by the energization of the respective magnets 12, 12 and 12 opening the respective driving circuits at 5, 5 and 5 The call thus stored up is made eifective to govern; the travel of the distant selector by causing itsarm'to trayel in synchronism closes circuits through the motor niagnetsof the respective registers withthe successive restoring movements of the finder brushes. The local controlling circuits at the sender and selector, which must be established in definite orderat successive stagesof the operation to bring into service the diiferent devices and parts as they are required, are established by automatic switch a pliances known as sequence switches, there eingone for the sender and one for the selector.- Such a device is illustrated in British patent to McBerty No. 20,839 of 1909, and in the present showing the switch springs of the sequence switches desired line, performing the requisite in-- are not shown in their actual arrangement, but are so located as to give the clearest arrangenient of Circuits. The positions of the rotary element of each sequence switch in which any of its'contacts are closed are indicated by the numbers placed adjacent such contacts, each contact being open in all positionsexcept those indicated by the adjacent numbers." Each sequence switch has a special contact governing the local or locking circuit of its motor magnet, such as contacts 175, 176, these contacts being closed while the rotary element of the sequence switch is in transit from one stopping position to-the next to insure that it will take the full movement and not stop in intermediate positions. Instead of designating the closed positions of the special contacts 17 5, 1? 6 of the sender and selector sequence switches, re-

spectively, the open positions are indicated and are placed on the oppositeside of the contactsinstcad otadjace'nt- -th'em'a s in the other sequence switch contacts. The special contact 175 of the sender sequence switch has no positions to run through without stopping, and merely serves to prevent the switch stopping between positions. For convenience in tracingthe circuits separate batteries are shown at various points, but it will be understood thatthese may, and where located in the same exchange would, in practice be oneand the some battery.

The organization and mode of operation of the system will prob-ably be best understood by tracing the successive steps involved in causing the selector to connect with a cidental operations, and finally restoring the circuits. and apparatus to normal. The operator will store up the call on the sender by depressing the necessary keys of the hundreds, tens and units registers, representing the digits of the wanted line. The depression of. the hundreds key grounds conductor 9 connected with the contact 10 corresponding to the depressed key of the hun- 'dreds register, and completes a circuit from ground 2, contact 3 of the depressed hundreds key, conductor 4, contact 5, conductor 6, moto-r magnet M to battery 8. The completion of the second circuit energizes the motor magnet M of the hundreds register and causes segmental rack 11. tobe driven.

forwarduntil its arm 12 strikes the contact 10 which has been grounded, when a circuit is vlosed-trom battery 13 through the stop magnet 12 to ground at 2, through contacts 3 of the depressed hundreds key. This operation (lisplaces the hundreds register fro normal corresponding to the vole-- pressed at in" similar manner the tens and units registers are each displaced the desired number of steps from their normal positions, thus placing the sending apparatus in readiness for completing the desired connection. The key 14 may then be depressed to startselection.

Depressing the key 14 completes a circuit from ground 15 through wire 10 and relay 17 to battery 18. Relay 17 operates, allowing current to flow from battery 18 through contact 19, sequence switch contact 20, wire 21 to sequence switch clutch 22 and. ground The sequence switch takes one step from its normal position to position 1 where contact 20 is opened, and contact 233 closed to complete a circuit from ground 24 of the units register, ofi' normal contacts 25, (closed when the register is displaced) Wire 26, wire 27, tons register ofi. normal contact 28, wire 29, hundreds register off normal contact 30, wire 31, sequence-switch contact 23, wire 32, stop relay 33 to battery 34. Stop relay 33 now operates, closing front contact 35, which completes the circuit from ground 36, stepping relay 37, wire 38, contact 35, wire 57, wire 101 (Fig. 2), sequence switch contact 102, line relay 103 to battery 148. The closure of front contact 50' of relay 33 closes a circuit from hattery 34, said contact, sender sequencejswitch contact 51, sender sequence switch motor magnet 22 to ground and the sender sequence switch moves to-position 2. The closure of the circuit including battery 148 and relay 103 causes the hundreds register to take its first half step toward the normal position when relay 37 in operating completes a circuit from ground 36, contact 40, sequehce switch contact 41, wire 42, stepping magnet 43 of the hundreds register to battery 44. At the same time relay 103 is operated to move the raises the selector rod 177 and the coni inutator bras-r116 intermittently closes andopens a short circuit around controller stepping relay 37- through the following circuit: ground 117, selector sequence switch contact- 118, wire 110-, commutator contact plate 120, brush 121, brush 116, contact plate 122, selector sequence switch contactv 123, wire 124, wire 125, relay 1.03 to battery 148. Each time this shunt circuit is completed the stepping relay 37 at the sender releases, and each time it is broken said relay pulls up, allowing the stepping mugnet 43 of the hundreds controller to operate the pawl 45 to enable the spring 46 to bring the register movement 11. a complete ,step back to'its normal position, for each make and break of the shunt circuit. -Whei1': the last step is completed the last half of I the sender arm 12 opens off-normal contact 30, thus breaking the circuit through stop relay 33 and opening the circuit to selector line relay 103.

Although the operation of the low speed clutch is started by acircuit to ground 104' through contact 106 of relay 103, it is not continued in operation by said circuit but by another whose connection to ground is independent of relay 103. Therefore when 're lay 103 finally releases after the opening of the line circuit at contact 30, and opens the starting circuit, the operation of the clutch is continued uninterrupted in position 2 over the other circuit which is traced as follows: ground 117, selector sequence switch contact 118, wire 119, commutator plate 120, wire 148, selector sequence switch contactcontact 141,'

139, wire 138, sequence switch wire 145, clutch 146 to battery- 147 When relay 103 released and closed its back contact 126 a circuit was completed from ground 104, contact 126, selector sequence switch contact 127, shift magnet 128, to battery 129. The operation of the shift magnet 128 twisted the selector rod 177 and caused its pin 178 to engage with the desired set of brushes 17 9 during the upward travel of the rod. The circuit whichcaused the sequence switch to be driven to position 2 was closed when relay 103 released and is traced from contact 126 of said relay through Wire 130, sequence switch contact 131, wire 132, wire 109, selector sequence switch clutch 110 to battery 111. At position 2 the line relay 103 is again energized locally through the following circuit, the selector sequence switch contact 102 in the circuit to the sender being open: sequence switch contact 118, wire 119, commutator plate 120, comutator brush 121, commutator brush 134, commutator plate. 135, wire 136, selector sequence switch contact 133, wire 124, wire 125, relay 103, to; battery 148. The result of the closure of this circuit is to close at front contact 106 of relay 103 a circuit to advance the sequence switch to position 3. The ground at 117 therefore not only completes a local energizing circuit for relay 103, but also serves to maintain the clutch magnet 1 46 energized during the entire brush selecting range of the commutator so that any desired brush may be seized without interrupting the movement of the brush rod. If nov otherv ground for the circuit of the clutch magnetwere provided than that under the control of relay 103, the clutch magnet would become deenergized as soon as the desired brush was selected and relay 103 deenergized, bythe opening of its circuit upon the return to nor, mal of the hundreds register. At position 3, however, this ground 11'? is removed by rack 181 will clear theend of the brush selecting movement or the opening of sequenceswitch contact 118,

ground for the remainder of the movement cf the rod over the brush section 122 being "supplied by the front contact of relay 103, wire 138, sequence switch contact 139, wire l48', commutator plate 120, brush 121', brush 134, com1nutator plate 135, wire 136, selector sequence switch contact 133, wire 124, wire 125, relay103 to battery 148. This locking circuit insures that the first tooth 142 of the the holding pawl 180 at range and not allow the brush rod to fall down when the power is cut off, since the relay 103 will be held up until the brush 134 leaves commutator plate 135, the end of which correspondswith the location of the first tooth 142 on theirack 181. Returning to the controller Fig. 1, it will be seen that when stop relay 33 releases, contact 50 is closed completing the following circuit: battery 34, relay contact 50, sender sequence switch contact 51, wire 52 to sequence switch clutch 22 and ground 53. Thisa vances the switch to position 3 for tens selection.v The switch is stopped at position 3 by the operation of stop relay 33 as follows: battery 34, relay 33, wire 32, sender sequence switch contact 54, wire 29, off-normal contact 28 of the tens register, mal, contact 25 ground 24.-

When the brush rod has reached the end of the brush range, relay 103 is released by the opening of the locking circuit referred of the units register to to, and its back contact 126 moves the sequenceswitch to position 4. At position4 wire 27, wire 26, otf-nor-w the circuit to the register is again closed through contact 102 and relay 103 again op erated. The closing of its frontcontact causes the sequence switch to move into position 5. Between positions 4 and 5 sequence switch contact 140 is' momentarily operated to send a preliminary step to the tens controller. While this is taking place the selector sequence switch; continues its movement to position 6 where tens selection takes place. In case the 0' tens key has been de pressed (2'. ctn'o tens steps are to'be taken by the selector) the preliminary step bycontact' satisfies'the tens register, that is to say, a

' clrcuitis closed and opened from ground 36,

through sender sequence switch contact 42 to the step magnet 43 of the tens register, which restoressaid register to normal, since the zero key has been depressed and the arm 46 thereof rested on the/first contact 10. The apparatus then proceeds to units selec tion. In case the. one impulse did not satisfy the tens registe'n however, at position 6- I of the selector sequence switch, relay. 103 will be held up with the result that current is supplied tothe high speed clutch 150 through sequence, switch contact 112, wire 113 to battery 115 and the high speed comniutator brush134 in passing over the tens commutator contact plates 152 intermittently short circuits relay 37 and causes the tens register to he stepped back to its normal v .32, selectcnsequence switch contact 55, wire position.

-When the tens register reaches normal position it opens the cit-normal contact28, releasing relay 33, which in turn releases relay 103 at contact 35. Relay 103 in releasing also releases the high speed clutch, and by means of its back contact 126, moves the sequence switch to position 7 which is preparatory to units selection, At the sender when relay 33 releases at the end of tens selection the sequence switch is moved to position 4; for units selection by the following circuit: battery 34, contact 50, sequence switch contact 51, wire 52, clutch 22 to ground The switch is stopped at position; 4. when relay 33 operates through the following circuit: battery 34, relay 33, wire 56,; wire 26, oif-iidrmal contactof th'e units register to ground 24. At. selector switch position 7 the circuit of relay 103 is again closed at the sender contact 35, which advances the switch to position 8 for units selection, in which position the circuit of the low speed clutch 146 is closed through contact 106 of relay 103, and selector sequence switch contact 141, and the brush rod 177 is again driven upward at low speed. During this operation the commutator contact brush 116 and units commutator plate 18% intermittently short circuit relay 37, as

' described before and the units register is operating magnet 37 was transferred 106 of the line relay 103 and.

allowed to'step back to its normal position. It'will be remembered that at the third position of thefselector sequence switch the con trol of the shunt circuit about the senderfront contact that the energizing circuit for the clutch 146 also is controlled at the same contact. We will now examine the various relative positions of the commutator brush 116, the

units commutator segment 184:, the linebrushes 7) and their cooperatingfixed terminals 2? during the process of a selection The commutator brushes are normally out of contact with the segments in orderto enable the sender operating relay 37 to be initially energized to cause the hundreds register to take the first half step, since the relay 37 would not pull up upon the energization of the @relav 33 if this shunt were closed at this time. There must be of course a definite relation between the commutator segments, the teeth of'thf'rack. the fixed line terminals and the fixedqholding pawl, there being necessarily a correspondence in number he tween the units commutator segments 1'84:

and the fixed line terminals. The commututor plate 13.3,which enables acircuit to be closed to keep thebrush moving throughout the brush range, is arranged in such relation to the fixed pawl and the teeth in the rack that when the brush 13 i clears its end, or in other words passes out of the brush-selectin range, the first or top tooth upon .the rack 142 will have passed the fixed pawl 180, and since the line circuit by which the relay 103 was initially energized was opened when the arm 12 of the hundreds register had opened the ofi-normal contact 30 upon its final movement, the shunt circuit controlling the circuit of the elevating clutch 1. 16 is opened the instant the brush 134 leaves the segment 135. The rod 177 then settles back until the pawl 180 reaches the bottom of the notch between teeth 1412 and 1 13, in which position the set of brushes selectc'd is one step below the first set of fixed terminals t. The low speed clutch alone, or the high and low-speed clutches alternately naythen be applied to continue the upward travel of the rod with its selected set of brushes 1), the relation between theun-its segments 18% of the conunutator and the teeth of the raclc-181 being such that when the commutator brush 116 clears the segment corresp mding to the. line tcrminals t predetermined by the setting of the sender, its corresponding tooth on the rack 181 has cleared the pawl 180 and is held thereby, with the selected set of brushes 1) in contact with the desired fixed terminals t. For various reasons, among which may be mentioned mechanical imperfections and th necessarily slight separation of the commutator segments 18t,-whcn the brush rod settles back the commutator brush 116 would in practice occasionally again contact with the corresponding units segment 184; which when it lett caused the opening of the shunt circuit and the consequent dcenergization of the line relay which through its front contactclosed the circuit of the power applying magnet 147, and therefore since this front contact opens when such decnergization occurs, this powcr-applying shunt circuit cannot again become closed when said brush falls back and comes into contact with the segment it left. or if haying enough inertia with the one above. Another advantage of this arrangement is that the selected oi brushes may be driven upward at as low :1 speed as desired without danger of underselecting. that is, of selecting the set of lin terminals below the one dcsired, this being due to the holding up of the line relay 103 by the shunt circuit after the alternative circuit to the sender has been opened. \Yhcn relay 103 released, its back contact 126 COlllpleted the circuit to the sequence switch clutch, which advanced the sequence switch r the pawl 180 and the To restore the selector to its normal posit-ion key 14 is released, which opens the circuit through relay 17. The back contact 61 of this relay restores the controller sequence switch to its normal position, and contact 62 completes a circuit from ground 18, wire 63, wire 1S8, selector sequence switch contact 143 to clutch 110 causing it to move 'to position 10, inwhich a circuit is closed from battery 129 through release magnet 182, selector sequence switch contact 185 to ground, which causes said magnet through the lever 186 and rack 181 to twist the rod 177 and cause the engaged tooth to slide off pin 178 to be disengaged from the brush 179 and they-both drop back to normal, the descent being periodically checked by cuit through the low-speed clutch 146 from battery 147, the magnet of said clutch, selector sequence switch contact 189, vibrator 190 to earth. hen the brush 134 reaches the commutator segment, with which it is shown in contact, a circuit is closed from battery 111 of the selector sequence switch motor magnet 110, sequence switch contact 187, the said commutator segment, brush 134, brush 121, segment 120, conductor 119, sequence switch contact 118 to ground 117, and the sequence switch moves on to normal position. The mechanism is now free to establish another connection.

Vhile the invention is particularly useful in selecting telephone line terminals in automatic or semi-automatic telephone exchanges, it may of course, be employed wherever it is desired to select one of a num-' ber of grouped circuit terminals.

1. The combination with a*selec tor, a motor-magnet therefor, a relay for controlling the circuit of said magnet, a line circuit, a sender, an operating magnet therefor in said line circuit, a contact in said line circuit controlled by said sender, a commutator and arm associated with said selector for closing a shunt path about said sender operating magnet to intermittently actuate the sender, and a contact in said shunt path controlled by said relay.

2. The combination with a line circuit, a sender, its operating relay, said sender being adapted to close the line circuit through an intermittent c-irsaid relay, a selector, a line relay at said selector energized by the closure of said line circuit, a motor-magnet for said selector energized by said line relay upon the closure of said-line circuit, a commutator and its arm, and a, shunt circuit about said sender controlled at a front contact of said'line relay, said shunt being intermittently closed by said commutator and arm to actuate said sender operating relay.

3. The combination with a line circuit, a Sender adapted to close. the same when displaced, a panel selecto and its brush, a relay energized by the closure of said line circuit, a motorvmagnet for driving said brush, a circuit for said motor-magnet and a shunt circuit abdiltsaid sender both controlled at a front contactof said relay, and a com1nutator and arm for intermittently closing said shunt when said relay is energized and said brush moved, permitting; the restoration of said sender to open said line circuit.

4. The combination with a line circuit, a

sender adapted to close the same when displaced, a selector, a relay energized by the closure of said circuit, a motor-magnetfor said selector, a circuit therefor closed at a front contact of said relay upon the closure of said line circuit, and ashunt circuit about said sender including said relay and its front contact, and a commutator and arm adapted to intermittently open said shunt circuit to permit the restoration of said sender which thereupon opens said line circuit, whereby the next opening of the shunt circuit by the commutator and arm de'e'nergizes said relay,

5. The combination with aselector provided with an interrupter, of a controlling circuit, and an operating circuit for the selector, and a relay for controlling said operating circuit having a contact and armature included in said controlling :ircuit in series with said interrupter whereby said relav effects a change in one of said circuits simultaneously with a change in the other of said circuits.

In witness whereof, I hereunto subscribe my name this seventh day of July A. 1)., 1911.

JOHN NEW' BERRY REYNOLDS. \Vitnesses:

IRVING Mac Donna), FRANK A. Fnu scrnmn.

Copies of this patent may be obtained for five cents each, by addressing the Commissibner of Patents,

-Washington, D. 0.

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