US1291959A - Finder-starting system. - Google Patents

Description

A. E. -LUNDELL.

FINDER STARTING SYSTEM.

APPLICATION FILED SEPT. 11. 1916.

Patented Jan. 21, 1919.

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I UNITED STATES PATENT OFFICE.

ALBEN- ELUNDELL, or NEW YORK, N. Y., ASSIGNOR To wEsTEEN EnncirniceoinrANr, INCORPORATED, on. NEW YORK, N. Y; A CORPORATION on NEW YORK.

EINnEnfls'r nTING SYSTEM. 1

' Spee ification of Letters Patent.

Patented Jan; 21, 19in.

a nea filed September 11, 191a; seriai N8. 119,479.

To all whom it may concern:

, Be it known that I, ALBEN E. LtiNneLL, a citizen of the United States, residing at New York, in the county of Bronx and State of Nework, have invented certain new and useful Improvements Finder-Starting Systems, of which-the" following is a full, clear, concise, and exact description;

' This inyention relates to telephone cit change system's employing machine switch ing, and more particularly to systems of the type in which line finder switches are deed. The' object- "of the present invention is. to

reduce to a minimum the timeinterval required between the startingof finders in search o'fl'calliing lines in the same group.

The invention has been-shown applied to a s'e'mi automatic system of the well-known power driven type employing switches of the panel type, but may obviously be arranged foruse ina variety-of systems.

Heretofore' in Panel Systems employing line finders, it has been the practice to permit only onefinder to start seeking a calling line at a time.- Although means have been provided for responding immediately to a second'call if in 'a'gr'ou other than that of the first calling line, means have been provided'for delaying the response to a second call in the same group,'in some systems'until the first callingline'has been reached, and in other systems until a time measuring switch has been fully operated in order to measure an interval slightly greater than the time required for the brush set to travel to the lastline of a group.

A feature of the present invention is the provision of means for starting a second line finder when a second call from the same group is originated, suchmeans being ineffective if only one call at a time comes in from that group. The first finder will seize the calling line the contacts of which are first reached, while the secondfi'nder will seize the other line. The system shown func 'In the drawingthe lines of two calling subscribers in the same group are represented. The apparatus diagrammatically indicated in the dotted rectangle at B' common to the gro ip which includes such subscribers. H The dotted rectangle at Bindicates similar apparatus common to a second group of subscribers, F and E show schematically t'w'o' line finders and circuits therefor; At A is shown an allotterfor sue; cessively bringing the finder switches into position tobe started. a

The finder switches used are preferabl of the type disclosedand described in Patent No. 1,177,044. The controlling sequence switch and the allot'te'r switch are preferably of a mechanical structure similar to that disclosed in Patent 1,127,808. I

The operation of the system when only one call is originated will first be described. When the subscriber at substation 1 dc} sires to initiate acall h'c removes'his receiver from its hook, whereupon a, line relay 2' is energized over t'he'line conductors and arma; tures and back contacts of a cutoff relay 3 in the well-known manner. At its righthand armature and front contact, relay 2 places a ground through a resistance 4 on the multiple test terminals 5 in which the for relay? from grounded battery, winding of relay 7, inner right-hand armature and front contact of relay 6, and winding of relay 6 to ground over the path previously described. Trip magnet 13', common to the group B," is energized in parallel, from grounded battery, Winding of magnet 18,

outer righth'a'n'd armature and front contact of relay 6 to ground, as' described. The operation of magnet13 moves a trip rod to release a setof brushes serving the desired group on whichever finder starts in search of the calling line,- i

The operation of relay 7 at its right-hand armature holds open starter wire 8 and prevents the operation of relays 6 of any other groups until the finder started by the first call has reached the desired stage of operation.

At its left-hand armature relay 7 completes a starting circuit for the finder indicated at F. This circuit extends from grounded battery, power magnet 100 of the finder sequence switch, sequence switch con tact 101, conductors 102, 108, to ground at the left-hand armature and front contact of relay 7. Sequence switch 100 moves from its first to its second position under the control of normal spring 104.

It is to'be understood that the sequence in which the finder switches are started is controlled by an allotter indicated at A, and that only one finder switch at a time is resting in position 1. After the finder switch F moves out of position 1 and the brush 120 has moved into engagement with commutator segment 12% by means of circuits to be described, a circuit is completed from grounded battery, power magnet 123 of an allotter switch A, contact125 controlled by allotter A, commutator segment 12 1, and brush 120 to ground. The allotter A is then moved from its first to its second position. On arriving in its second position, a circuit is completed for the sequence switch of finder F from grounded battery, power magnet 200 of the sequence switch of finder F, contact 201, conductors 202, 203, and contact 126 to ground. The sequence switch at F is moved from its eighteenth to its first position, andthe finder F is now in a position to be started when the common relay 7 is again energized by the initiation of a call in any of the groups. The finder sequ nce switches rest in the eighteenth position upon the completion of the conversation, as will be described, and await the ac tion of the allotter.

To return now to the operation of the finder F, it will be remembered that the se-' quence switch of this finder is now in the second position. Atthis time a circuit is closed for up-drive magnet 105 from grounded battery, winding of magnet 105, armature and back contact of relay 106 to grounded battery at sequence switch contact 107. When the finder test brush 108 engages test terminal 5 of a line calling, a

circuit will be completed from grounded bat-' tery, winding of relav 106, sequence switch contact 109, brush 108, terminal 5, righthand armature and front contact of relay 2 to ground through resistance 1. The operation of relay 106 opens the circuit of the up-drive magnet 105 and completes a circuit for moving sequence switch 100 out of its second and into its sixteenth position, this circuit being from grounded contact 107, armature and front contact of relay 106, winding of power magnet 100 of the finder sequence switch to grounded battery.

in positions 3 to 16 of the sequence switch, battery is supplied to terminal 5 from grounded battery, resistance 110, sequence switch contact 111 and brush 108. Marginal'cutolf relay 8 operates when the resistance of relay 106 is removed from the circuitQ Cutoff relay 3 removes the control of the line relay 2 from the calling subscriber in the well-known manner.

During the upward motion of the brush shaft, brushes 120 and 127 are carried up ward over commutator segments 121, 124 and 128, respectively. When brush 127 engages segment 128 a circuit is completed from groundedbattery, left-hand armature and front contact of relay 6, right-hand winding of relay 11, conductors 1 1 and 15, sequence switch contact 129, segment 128, brush 127, to ground. Relay 11 is energized and opens the circuit of relay 6; relayv 7 and trip magnet-13 being deenergized at the same time. Relay 11 at its trontcontact and armature completes a locking circuit for itself from grounded battery, left-hand winding of relay 11, armature and back contact of a-marginal'relay 16, armature and" front contact of relay 11, left-hand armature and front contact of relay 2 and resistance 12 to ground. When the cut-ofl relay 3 is energized, line relay '2 is denen gized and the locking circuit for relay 11 is broken. The apparatus is now in condition to start another finder;

-When the finder F arrives in position 16 a calling subscriber may converse with an operator whose position is indicated at 0', who, upon ascertaining the numberof the desired line, may set up a connection to the wanted subscriber inany desired manner,

a train of automatic switches being indicated in the present instance at 112 and 113.

At the conclusion of the conversation, the operator at O is informed in the well-known manner by the lighting of supervisory signals controlled by relays 11 1, 115. She then depresses a key 116, completing a circuit from ground, contact of key 116, sequence switch contact 117, the winding of power magnet of sequence switch 100, to grounded battery. The sequence switch then moves into the seventeenth position, at which time a circuit is completed for downdrive magnet 118 from grounded battery, winding ofmagnet 118, sequence switch contact 119 to ground. The brush set is then returned to normal position, and when the commutator brush 120 engages segment 121 a circuit is completed from ground. brush 120. segment 121, sequence switch contact 122, winding of the power magnet of sequence switch 100 to V grounded ba e y-- T e sequence "switch then moves from p sition 7 into re it n .8. Whe it r m in a i g the. at ics t allotterA- I the ca l i or g na ed n group B before bru h 1210 finder F as. reached se rmen l eX-6-Qf s h roup ann t ersiz due to the energized: cond tion, of 09maien. r lay s een, how ver, relay 7 s de rg zed, a circ i will be o p e ed 0 relay (i -from grounded, battery, right-hand arma ure and back conta t Qf e y ductors 8 and 17, to relay 6, and ground at the lefthand armature of the line relay of the liner calling as previously described. The operation of relay 6 allows relay 7 to be energized over a path from g ound d hat: tery, winding of relay 7, inner right-hand armature and back contact of the relay 6 of group B, conductor 18, to ground as described in the operation of the call originated in group B. Relay 7, upon energiza tion, will complete a starting circuit for finder F from ground, left-hand armature and front contact of relay 7, common conductor 103, conductor 204, contact 205, winding of power magnet 200 of the sequence switch associated with finder F, this sequence switch having been moved into normal position after the operation of finder F has reached a certain stage of operation, as previously described, by the action of allotter A. It is to be understood that the starter wires 8 and 18 are extended through all the groups served by the finders.

The operation of the system, in case two calls are originated in group B in close succession, will now be discussed. The first call will operate the group apparatus as previously described. When, however, relay 11 is energized, if a second call is in existence, there will be two paths to ground through resistances 12 in multiple. The decreased resistance of the path to ground allows marginal relay 16 to operate, opening at its armature and front contact the locking circuit of relay 11. This relay will then immediately deenergize and allow relay 6 to be energized in response to the second call in the group, regardless of the position of the finder searching for the first line. The operation of relays 6 and 7 serves to start an allotted finder in the previously described manner. It will thus be seen that in case of two calls from the same group which may be simultaneous or in close succession, a finder will be started and as soon as brush 127 engages segment 128. circuits are completed by which a second finder will be started in search of the second line.

It would be possible that this first finder would seize the terminals of the second line if they are lower in the panel, but this would not be harmful since the second finder would ,etieue unt it ound he. erm sh W lte ai e s 1. In a tale hone exchange system, a plurality of callln substation lines arranged in groups, a p uralityof finder switches serving said lines, means to start a finder te- Select a desir d' eu a to e v for a calling line "in said esired group upon the. initiation of a call, means to, move a sce d finder to. a posit to. b rt and meansto start said second finder in ea h. of. a san ca l in i he s gr en as see Sa eco fi der has. me e t me a. maiden t b st rt d 2. In a telephone exchange system, a plurality of calling substation lines arranged in groups, a plurality of finder switches serving said lines, one only of said switches being in a position to be started, means to start said positioned finder in search of a calling line, means to move a second finder into a position to be started as soon as said positioned finder has begun to search for a calling line, and means to start said second finder in search of a second calling line in the same group.

3. In a telephone exchange system, a plurality of calling substation lines arranged in groups, a plurality of finder switches serving said lines, an allotting switch for successively moving said finder switches into a position to be started as soon as an allotted finder starts its operation. means to start an allotted finder in search of a calling line, and means to start a second finder in search of a second line in the same group as soon as said second finder has been allotted.

4. In a telephone exchange system, a plurality of calling substation lines arranged in groups, a plurality of finder switches serving said lines, sequence switches associated with said finder switches, an allotting device for moving said sequence switches successively into position to start their respective finders, means to start a finder in search of a calling line, means including said allot'ter and actuated upon the starting of the operation of said first finder for moving the sequence switch of a second finder into a position wherein said second finder may be started, and means to start said second finder in search of a second calling line in the same group as soon as the sequence switch of said second finder has been moved to starting position.

5. In a telephone exchange system, a plurality of calling substation lines arranged in groups, a plurality of finder switches serving said lines, an allotting switch for successively moving said finder switches into a position to be started, a relay individual to said groups of lines, said relay controlling the starting of allotted finders, a second relay, a circuit for said first relay extending through back contacts of said second relay, means for energizing said second relay as soon as an allotted finder has started, a locking circuit for said sec- 0nd relay, and means for holding open said locking circuit if another call is present in the same group.

6. In a telephone exchange system, a plurality of calling substation lines arranged in groups, a plurality of finder switches serving said lines, an allotting switch for successively moving said finder switches into a position to be started, a group relay newness controlling the starting of an allotted finder, a second relay, means for energizing said second relay when a finder has been started, a circuit for said first relay extending through back contacts of said second relay, a marginal relay, a locking circuit for said second relay extending through *backcon- ALBEN E. LUNnn n Copies of this patent may be obtained for five cents each, by addressing the Commissioner oflat'ents,

Washington, D. C.

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