US1280258A - Call-indicating system. - Google Patents

Description

A. E. LUNDELL.

CALL INDICATING SYSTEM.

APPLICATION nuzo NOV. 1. 191a. RENEWED MAR. I3. 1918.

LWQQM, Patented Oct. 1, 1918.

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lm/emor: Alfie/1 E. Lamdel/L A. %E. LUNDELL.

CALL INDICATING SYSTEM.

APPLlCATlON FILED NOV. 1, I916. RENEWED MAR-13,1918.

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A. E. LUNDELL.

CALL INDICATING SYSTEM.

I APPLICATION FILED NOV. 1, I916. RENEWED MAR. 13.1918.

Patentedl Oct. 1,1912%,

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ALBEN E. LUN DELL, OF NEW YORK, N. Y., ASSIGNOR T WESTERN ELECTRIC COMPANY, INCORPORATED, 013 NEW YORK, N. 1 A CORPORATION OF NEW YORK.

CALL-INDI [CATING SYSTEM.

Specification of Letters Patent.

Application filed November 1, 1916, Serial No. 128,874. Renewed March 13, 1918. Serial No. 222,241.

To all whom it may concern:

Be it known that 1, Armin E. LUNnELL, a citizen of the United States, residing at New York, in the, county of Bronx and State of New York, have invented certain This invention relates to trunking in telephone exchange systems, and more particularly to systems in which automatic means are provided for informing a final connecting operator of the number of the wanted line.

It is the A feature of the invention is an arrangement by which a sequence switch rotates through its cycle to send impulses in accordance with the setting of a register, which may be a'manually adjusted keyboard, or some type of electromagnetically adjusted switch. p

A further feature of the invention is the utilization of both sides of the'trunk for impulse sending, the impulses over one side of the trunk being used to operate a step-bystep switch, and the impulses over the other side being used to energize desired ones of a combination of locking relays, such other side of the line being successively extended to said relaysby the operation of the stepbystep switch.

The invention has been shown as applied to a telephone exchange system of'the wellknown semi-automatic type, but is obviously capable of arrangement for use in other systenis.

It is thought that the invention will best be understood from the following detailed description, reference being had to the accompanying drawings.

In the drawings, Figure 1 represents the substation apparatus of a calling subscriber and an A o )erators connectin cord circuit together with a selector switch for extending the calling line to a trunk leading to a B operators position. In Fig. 2, portions of a connecting circuit at the B operators po sition are shown, together with the substation line and apparatus of a called subscriber. A step-by-step switch which contrated.

object of this invention to pro-. vide an improved meansfor informing a final connecting operator ofthe number of the Wanted line by means of visual signals.

trols the call indicating device is indicated in the lower portion of Fig. 2. Fig. 3 represents the A operators sending device and the operating circuits therefor. In Fig. 4: therelay combination controlling the lighting of the number indicating lamps is illus- It is to be understood that in practice there would be only one sender per operators position, and that this sender would be associated with the proper cord circuit by means of a cord finder switch. Since this 'arrangementis Well-known in the art, the cord finder has been omitted for the sake of simplicity, and it has been assumed that there is a sender in permanent association with each cord.

When the subscriber at substation 1 desires a connection, he removes his receiver from the hook, causing the display of a line signal 2 'by the operation of line relay 3 in the well-known manner. The connecting operator at 0, upon observing the lighted lamp 2, inserts a plug 4 into a jack 5 associated with lamp 2, whereupon cut-0d relay 6 is energized over' a'circuit from grounded battery, winding of relay 6, sleeve contact of jack 5, sleeve of plug l,windin of relay 7, to ground. Bela 7 -1s energize and completes a circuit or the power magnet 100 of the connecting cord sequence switch from grounded battery, winding of power magnet 100, connecting cord sequence switch contact 101, front contact andarmature of relay 7 to ground. The connecting cord seql16IlC6 S\V1tCl1 moves from position 1 into position 2, under the control of its normal Patented net. 1., acre.

is now completed for relay 8 from grounded battery, winding of relay 8, connecting cord sequence switch contact 107, conductor 108, armature and back contact of the upper 0 counting relay, winding of stepping magnet. 109, sender sequence switch Contact 110, conductor 111, to ground at connecting cord lllliti sequence switch contact 112. Relays 8 and 109 are energized in this circuit. Relay 8, at its left-hand armature and front contact, locks itself to conductor 108 through con- -necting cord sequence switch contact 113,

and at its right-hand armature and front contact, completes a circuit from ground, through connecting cord sequence swltch contact 114, for moving the connecting cord sequence switch out of position 2 into position 3.

It is to be understood that the operator at 0 has in the meantime ascertained the number of the desired line in the well-known manner. She then depressed one of the keys 115, 116, 117, etc., which control the counting relays, to cause the selector associated with her cord circuit to hunt in a section whose trunks run to the deslred ofhce. She

also depressed a key in each of the sets,

K, K .-It is assumed that the called subscribers number is composed of only two digits for the sake of simplicity. It is ob vious, however, that the system could be extended to indicate any desired number of digits. v i

Let us assume that the trunks running to the desired office are located in the first group of contacts of the selector, and that the number of the wanted subscriber is 47.

The operator will then have depressed ofleft-hand armature and front contact of relay 8, connecting cord sequence switch contact 123, conductlng segments of a commutator 1:24 and brush 125 to ground. This intermittent actuation of relay 109 successively operates the counting relays in the well-known manner. When the upper counting relay 0 is energized, the circuit of relay 109 is permanently opened, and when brush 125 engages the next insulating segment, the alternate path of relay 8 to ground is broken, and this relay also de'e'nergizes. The energization of the upper counting relay 0 completes a circuit from ground, right-hand front contact of the upper 0 counting relay, sequence switch contact 120, he winding of power magnet 105, to grounded battery, to move the sender sequence switch out of position 3 into position 4. T he deenergization of relay 8 completes a circuit from ground, right-hand armature and back contact of relay 8, connecting cord sequence switch contact 127 and winding of power magnet 100-, "for moving the connecting cord sequence switch out of position '3 and into position 11.

The brush set 122 hunts for an idle trunk to a B operators position indicated at 0 in a position of the connecting cord sequence switch between positions 3 and 11, in the well-known manner,

When the brush set 122 comes to rest on the terminals of an idle trunk, a circuit is completed for relay 128 from ground, winding of relay 128, sender sequence switch contact 129, conductor 111, connecting cord sequence switch contact 130, brush 131, 1361'.- minal. 132,, lower contact of spring 133, upper left-hand winding of a repeating coil 134, and winding of relay 135 to grounded battery. Relays 128 and 135 are energized,

.relay 128 closing at its front contact a cirnal 137 is lighted in this circuit and informs v the operator that a call is coming in over the trunk with which such signal is associated. She then depresses the key whose springs are indicated at 133, 141 and 142, and maintains it depressed until the light. ing of the number'indicating lamps informs her of the number of the desired line.

When key 133 is operated, battery is removed from conductor 111,, and relay 128 deenergizes, closing at its armature and'back contact a circuit through sender sequence switch contact 143, for moving the sender sequence switch out of position 4 and into position 5.

When the sender sequence switch arrives in position 5, a circuit is completed from ground, sender sequence switch contact 144, impulse sending switch contact 145, winding of power magnet 146 of an impulse sending switch, to grounded battery. This switch, when actuated, rotates through its cycle of positions without stopping until it returns to normal position. Impulses are sent over the lower trunk conductor from ground, impulse sending switch contact 147, sender sequence switch contact 148, conductor 108, connecting cord sequence switch contact 149, brush 150, terminal 151 over thelower contact of key spring 141-, left-hand armature and back contact of relay 152, and the winding of relay 153, to grounded battery. Impulses are sent over the upper trunk conductor, in accordance with the setting of key sets K and K, over conductor 154,

sender sequence switch contact 155, con- {ductor 111, connecting cord sequence switch contact 130, brush. 131, terminal 132, upper contact of key spring 133 and wiper 156 of Y understood, however, that the system might readily be arranged for use with any de-- sired number of digits. y

The operation of the indicating device I will now be described. Assuming'that the {will depress key 20 number of the called line is 47, the operator 4 of key set K and key 7 of key set K When the impulse send ing switch passes from positions 1%} to 2%, contact'147 'will be closed, completing the previously traced circuit for relay 153. Relay 153 will be energized and completes a circuit from grounded battery, winding of stepping magnet 157, wiper 158'and its first contact, armature and front contact of relay 153 to ground. The operation of the switch controlled by magnet 157 will b cause wipers 156, 158 and 159 to be ad vanced into their second positions. Locking-relay 160 is now connected to the upper trunk conductor through side-switch wiper 156, but is not energized since conductor 154 finds no ground while the-impulse sending switch is assing-through position 2, due to the fact that conductor 161 is not connected to contacts of key 4 in the, tens group. When the impulse sending switch leaves position 24 relay 153 is denergized, and acircuit is completed from grounded battery,

winding of stepping magnet 157, wiper 158' in its second position, armature and back contact of relay 153'to ground. The stepby-step switch wipers are now moved from position 2 to position 3. When the impulse sending switch passes from positions 3% to 4%, relay 153 is again energized to advance the step-by-step switch from position 3 to position 4. In this, position relay 162 is connected to the upper trunk conductor over side-switch wiper. 156, but is not energized since no ground is put on conductor 154 when the impulse sending switch passes through position-4. On leaving position 44, relay 153 is denergize'd and moves the step-by-step switch into position 5.

When the impulse sendingswitch passes from positions 5% to 6%}, relay 153 is again energized-t0 move the step-by-step switch from position 5 to position 6. At this time relay 163 is connected to the upper trunk conductor, but is not energized since no ground is put on conductor 154 when the impulse sending switch passes through positlon 6. The step-by-step switch is moved into position 7, as previously described.

When the impulse sending switch moves through positions 7?; to 84, relay 153 is energized to move the step-by-step switch into position 8. At this time relay 164 is connected to the upper trunk conductor as described, but is not energized since conductor 154 finds no ground when the im pulse sending switch moves through position 8. The step-by-step switch is moved into position 9 as before described.

When the impulse sending switch passes from positions 95;- to 102;, the step-by-step switch is moved into position 10. At this time relay 165 is connected to the upper trunk conductor and is energized, since conductor 154 is grounded when the sending switch passes through position 8 over a path through impulse sending switch contact 166, conductor 167, closed contact otkey 7 of the set K, to ground. Relay 165 looks itself up over a path from grounded battery, winding of relay 165, its armature and deft-hand front contact, conductor 168,]

armature and front contact of relay 169, to ground. Relay 169 was energized when key spring 142 was closed, over a path from grounded battery, winding of relay 169, to ground through the-.clOsed contact of key.

spring 142. -When the sending switch leaves position 104 the step-by-step switch is moved into position 11, as reviously described. The step-by-step switch will continue to 'be advanced in the manner described under the control of contact147. No more of the locking relays are energized, since conductor 154 fails to find ground when the' impulse sending switch moves through positions 12, 14 and 16.. When the sending switch leaves position 16% the step- I by-step switch moves into .position 17.

At this time a circuit is completed for relay 152 from grounded battery, winding of relay 152, conductor 170,'wiper 159 and its 17th contact, to ground. The operatlon or relay 152 opens the circuit. of relay 153 and prevents any difference in potential between the battery of repeating coil 188 and the battery at the oiiice at which relay 153 is located, from causing an undesired energization of relay 153, when the connecting .coro sequence switch moves intop'osition 16 as will be later described.

When wiper 159 arrives in position 17, the circuits for lamp 4 of the tens group and lamp 7 of the units group are completed as follows, it being remembered that of the locking relays only relay 165 is energized. The circuit of lamp 4 of the tens group extends trom grounded battery, right-hand armature and back contact of relay 164, conductor 171, outer right-hand armature and back contact of relay 163, outer rightand back contact 0 conductor 172.

hand armature and back contact of relayv- 174, inner right-hand armature and back contact of relay 175 lamp 7, inner armature f relay 176, to grounded It is to he noted that at this time no other lamps can be lighted in the tens group, since the unactuated condition of relay 164 prevents battery being supplied to lamps 9, 7,

unactuatedcondition of relay 160 prevents lamp 0 from being lighted. Similarly, in the units group no other lamp than lamp 7 can be lighted, since the actuated condition of relay 165 prevents lamps 0, 1, is, 3 and 4 from being lighted; the unactuated condition of relay 174 prevents lamp 9 from being lighted; the unactuated condition of relay 175 prevents lamps 8 and 6 from being lighted, and the unactuated condition of relay 176 prevents the lighting of lamp 5. 1

The setting up of any desired number by, means of the lamps may be traced in a manner similar to that above described.

When" the operator at 0 observes the lighting of the numberindicating lamps,

she releases the key whose springs are indicated at 133, 141 and 142, and the trunk is connected through springs 133 and 141 to the left-hand winding of repeating coil 134.

The opening of the contact controlled by spring 142 results in the denergization of relay 169, whereupon circuit is completed from grounded battery, winding of stepping magnet 157, side-switch Wiper 158 in its 17th position, to ground through the armature and back contact of relay 169. The stepby-step switch makes one step into its normal position, causing the extinguishing of the lamps by the removal of ground from conductor 172. The step-by-step switch, as

shown in the drawing. shows the wipers ar-' erationwhcrc the impulse sending switcli left position 16. ()n arriving in position 17, a circuit is completed from ground, impulse sending switch contact 17 7, sender sequence a switch contact 178, winding of power magnet 105 of the sender sequence switch, to grounded battery. The sender sequence switch moves out of position 5 into position 1 under the control of its normal spring 106. The impulse sending switch continues into position 1 where it comes to rest, since its ground, sender sequence switch contact 180,

conductor 131, connecting cord sequence switch contact 182, winding of power magnet 100 of the connecting cord sequence switch, to grounded battery. The connecting cord sequence switch then moves from position 11 into position 16 under the control of its normal spring 102. In osition 16 the talking strands of the cord s own at 0 are connected tothe brushes 131. and 150 cord sequence switch tion ofthis operation, assuming that the line was idle, a circuit is completed for relay .139 from grounded battery, lamp 137, relay 139, sleeve of plug 183, sleeve contact of jack 184, and the winding of cut-ofl' relay 185, to ground. Relays139 and 185 are energized, relay 1.85 removing the control of the line signal from the called subscriber in the well-known manner. Relay 139 at its upper armature and front contact connects the upper talking conductor of the connecting cord'to the tip conductor of plug 183. At its lower armature and front contact relay 139 completes a locking circuit for itself, from grounded battery, resistance 186, lower armature and front contact of relay 139, armature and front contact of relay 135, conductor 138, winding of relay 139, sleeve of plug 183, sleeve contact of jack 184. and the winding of cut-off relay 185, to ground. Since coil 186 is of comparatively low resistance, it shuntsout lamp 137. Relay 135 is held energized at this time over a path from grounded battery, winding of relay 135, upper left-hand winding of repeating coil 134, lower contact of key spring 133, upper trunk conductor, terminal 132, brush 131, connecting cord sequence switch contact 187, and the upper right-hand winding of repeating coil 188, to ground.

The insertion of plug 183 into jack 184 and the subsetpient response of the called subscriber, completes a circuit for supervisory relay 189 over the called subscribers line in'the usual manner. The operation of relay 189 completed a circuit for a supervisory relay 190 over a circuit from grounded battery, lower right-hand winding of re peating coil 188, windingof supervisory relay 190, connecting cord sequence switch contact 191, brush 150, terminal 151, lower trunkconductor, upper contact of key spring 1 11, lower left-hand winding of repeating coil 134, impedance coil 192, to ground through the armature and front contact of relay 189. The connection is now complete and the subscribers may converse.

At the conclusion of the conversation, after both parties have replaced their receivers, relay 189;will be deenergized, due to the hangingrup of his receiver by the called party. his 189 results in the deenergization of supervisory relay 190. The hanging. up of the calling partys receiver results in the deenergization of relay 193. The lighting of the WelLknown supervisory lamps (not shown) at the operators position indicated at 0, informs the operator that connection is no longer desired and she removes plug 4 from jack 5, whereupon relay 7 is deenergized. The deenergization of relay 7 completes a circuit from ground, armature and back contact of relay 7-, connecting cord sequence switch contact 194, winding of power magnet 100, to grounded battery, for moving the connecting cord sequence switch out of position 16 and into position 18.

In position 18 of the connec'tingcord sequence switch, a circuit is completed from grounded battery, winding of power magnet 195, connecting cord sequence switch contact 196, to ground. Brush set 122 is returned to normal position under the control of a constantly rotating roller 197. When brush 125 engages segment 198 a circuit is completed from ground, brush 125, segment 198, connecting cord sequence switch contact 199, and the winding of power magnet 100, to grounded battery, for moving the connecting cord sequence switch out of position 18 and into position 1. As soon as brush set 122 moved off the terminals of the trunk over which the connection is established, the circuit of relay 135 is broken and the shunt circuit about lamp 137 is removed.

The resultant lighting of lamp 137 informs the operator at 0 and she removes plug 183 from jack 18 1. The apparatus has now all been restored to normal and is ready for reoperation. I

Referring to that point of the operation at which the operator at O inserted plug 183 into jack 184, it will be noted that if the called line is busy, the operator will receive a click in the receiver indicated at 200, due to the presence of potential on the sleeve conductor of jack 184:. This potential will be sup-plied from grounded battery, either through lamp 137 or through resistance 186, and when the tip of plug 183 endeenergization of relay over said trunk line, an indicatin system, calling and called lines, a final conneoting operators position, a trunk line,

means for extending a calling line to said operators position oversaid trunk line, an

indicating device for displaying the number of a called line at said position, means to simultaneously send impulses over both sides of said trunk, a step-by-step switch operated by impulses over one side of said trunk, and a combination of locking relays to control said indicating device, desired Ones of said relays being energized by impulses over the otherside of said trunk.

2. In a multi-oflice telephone exchangesystem,'calling and called lines, a final connecting operators position, a trunk line, means for extending a calling line to said operators position over said trunk line, an

indicating device for displayin the number of the called line at said position, means to simultaneously send impulses over'both "sides of said trunk, a step-by-step switch operated by impulses over one side ofsaid trunk, and a combination of locking relays to control said indicating device, desired ones of said relays being energized in corresponding positions of said switch by impulses over the other side of said trunk.

3. In a multi-ofiice telephone exchange system, balling and called lines, a final connecting operators position, a trunk line, means for extending a calling line to said operators position over said trunk line, an indicating device for displaying the number of the called line at said osi'tlon, means to simultaneously send impul es over both sides of said trunk, a step-by-step switch operated by impulses over one side of said trunk, a set of fixed contacts arranged for engagement by a wiper of said switch, and a looking relay associated with each of said fixed contacts, said relays being arranged to be energized by impulses over the other side of said trunk.

4, In a multi-oflice telephone exchange system, calling and called lines, an A operators position, a B operators position, a trunk line, means for extending a calling line tosaid B operators position device for displaying the number of the ca led line at said B operators position, a key set at said A operators position, means to simultaneously send impulses over both sides of said trunk, a step-by-step switch operated by impulses over one side of said trunk, and a combination of locking relays to control said indicating device, desired ones of said relays being energized by impulses over the other side of said trunk in,

accordance with the setting of said key set.

.5. In a multi-oflice telephone exchange system, calling and called lines, an A operators position, a key set thereat, a B operatofls position, a trunk line, means to extend a calling line to said B operators position over said trunk line, an indicating device for displaying the number of the called line at said B operators position, a multi-position sending switch at said A operators position, means including said switch to simultaneously send impulses over 0th sides of said trunk, a step-by-step switch operated by impulses over one side of said trunk, and a combination of relays to tion, said switch being ar'anged to move through its cycle of positions and return to normal without stopping when moved out of normal, means including said switch to simultaneously send impulses over both sides of said trunk, a step-by-step switch operated by impulses over one side of said trunk, and a combination of relays to control said ma am a signaling device, means for simultaneously sending impulses over both of said conductors, a step-by-step switch operated by im pulses over one of said conductors, and a combination of locking relays arranged to be operated by impulses over the other conductor to selectively operate said signaling device.

8. In a telephone system, two conductors, a signaling'device, means for simultaneously sending impulses over both of said conductors, a step-by-step switch operated by impulses over one of said conductors, a set of fixed contacts arranged for engagement by a wiper of said switch, and a relay associated with each of said fixed contacts, said relays being arranged to be operated by impulses over the other conductor to selectively operate said signaling device.

9. In a telephone system, two conductors, a signaling device, means forsimultaneously sending impulses over both of said conductors, a manually operable device for varying the number of impulsessent, a step-bystep switch operated by impulses over one of said conductors, and a combination of relays for controlling the operation of said signaling device, said relays being arranged to be operated by impulses over the other conductor in accordance with the operation of said manually operable device.

In witness whereof, I hereunto subscribe my name this 30th day of @ctober A. D, 1916.

ALBEN E. LUNDELL.

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