US1251544A - Machine-switching telephone-exchange system. - Google Patents

Description

A. E. LUNDELL.

MACHINE SWITCHING TELEPHONE EXCHANGE SYSTEM. APPLICATION FILED APR. 26. I916.

Patented Jan. 1, 1918.

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UNITED STATES PATENT orrron,

ALBEN' E. LUNDELL, OF NEW YORK, N. .Y., ASSIGNOB, -T0 WESTERN.ELECTRIGCOMB-ANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION -OF NEW YORK.

MACHINE-SWITCHING TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

PatentedJan. 1,1918.

Application filed April 26, 1 916. Serial No. 93,639.

To all whom it may concern:

Be it known that I, ALBEN E. LUNDELL, a citizen of the United States, residingat New York, in the county of Bronx and State of New York, have invented-certain new and useful Improvements in Machine- Switching TelephoneExchange Systems,of which the following is a full, clear, concise,

"and exact description.

advanced to the next idle finder after the initiation of a call.

The object of this invention is tore'duce this'interval, and the novelty consists in a circuit arrangement wherein, in a finder having a primary and secondary movement. a circuit arrangement is provided for extending the starter wire to the next idle finder upon the termination of the primary movement of such finder in seeking a calling line, instead of upon the termination of the secondary movement of such finder.

Referring to the drawing, which shows only so much of a telephone exchange system as is necessary for a comprehension of the invention. the lines terminate in multiples 12S 129 of a number of automatic finder Each line is also provided in the finders with test multiples 110, and with the usual line and cut- off relays 100, 102. The finder brushes are designated 125, 126, 127 and are adapted to be given a primary movement by a magnet 119 to position the same in operative relation to the group of multiples containing the calling line and a secondary movement by a magnet 133 to pick out the calling line multiples in the group.

The invention will be more clearly understood by tracing the operations involved in sett ng up a connection.

Upon the removal of the receiver by the subscriber at substation A, line relay 100 is energized'over the following circuit: free pole ofbattery left winding of relay 100,

conductor. 101, left armature and bfiCkCQl'ltact of cut-off relay 102, conductor-103, line conductor '101,"t'elephonic' apparatusat -sub is closed to energize the escape -magnet 122 station A, line conductor-105, conductor 106, right armature and back contact of relay 102, conductor 107, right winding ofrelay .100 to ground. Relay 100, in attracting its left armature, closes the following shunt path aboutthe cut-oft relay 102- to test multiples 110 of the calling line: free pole of battery,

resistance 108, left armature and front con tact of relay 100, conductors 109 and 135. The closure of this shunt pathabout the cutoff relay 102 causes a calling conditiontobe placed upon the test multiples 110 in the finders in which line A appears. Relay 100, in attracting its right armature, closes the following circuit for a starting relay 11 1:

free pole of battery, resistance 112, right armatureand front contact of relay 100, 'conductor113, relay 114: to ground. The

closure of thiscircuit also places a calling condition upon the multiple commutator segments 111 of the group of lines to which substation A belongs. Relay 114, in attracting itsarmature, closes the following circuit for a relay115: free pole of battery, armature and front contact of relay114:,conductor 116, finder side-switch arm 1 and its first contact, conductor 117, left winding of relay 115, conductor 118 to ground at themmature and back contact of the primary stepping magnet 119 ofthe finder. Relay 115,

in attracting its armature, closes the circuit of magnet 119, and the magnet 119, in attracting its armature, opens thecircuit of relay 115. Thus the finder brush shaft 120 is given a primary movement in search of the calling group. "l/Vhen the brush 121, which rotates with the brush shaft 120, encounters multiple segment-111 of the calling group, now grounded, the following circuit of the finder side switch: free pole of battery, resistance 112, right armature and front contact of relay 100, conductor 113,

segments 111, brush 121, conductorl23,arm

0 and its first contact, magnet-122, conduc ranged torclose the circuit for magnet 1'22 and the right winding of relay 115," before the'circuitthrough the leftwinding of "relay is broken by the armatureof-magnet 119. 'R'ela-y 115 is adaptedto 'energize in this circuit, with the result that magnet 119 is maintained energized for an instant after the last step to prevent the shaft 120 from overthrowing. The escape magnet 122 is constructed to release the side switch from position to position upon its energization, and upon the closure of the circuit traced, releases the side switch into position 2. Arm 6, in moving off its first contact, deenergizes escape magnet 122 and relay 115. In position 2, arm 6 shunts out relay 114, with the result that the in-starter 132 is connected to the out-starter wire 131 over arm 1 and its second contact. A call may now come in from another group over the iii-starter wire 132, and set the finder connected to the out-starter wire 131 in motion, while the finder shown in the drawing is making its secondarv movement in search of the calling line. Upon the termination of the primary movement of the finder and the release of the side switch into its second position, arm 5 closed the following circuit for the secondary stepping magnet 133 of the finder, to drive the positioned brushes 125, 126, 127 over the multiples of the calling group containing those of the Calling line: free pole of battery, magnet 133, its armature and back contact, arm 5 and its second contact to ground. In position 2 of the side switch, arm 4 connects the escape magnet 122 to test brush 127. hen the test brush 127 reaches the test multiples 110 of the calling line, upon which a calling condition has been placed by the attraction of the left armature of relay 100, escape magnet 122 becomes energized and releases the side switch into position 3. Although the right winding of relay 115 is included in the circuit of magnet 122 as before, it is not adapted to respond, through the resistance 108.

Arm 5. in leaving its second contact, opens the circuit of the secondary stepping magnet 133. thus stopping the finder brushes 125, 126, 127 upon the multiples of the calling line 128, 129, 110. The escape magnet 122 will not energize as brush 127 passes over multiples 110 of non-calling lines, since it will not receive enough current. In position 3, arm 1 maintains the continuity of the in and out-starter wires 132, 131. Arm 4, in moving into position 3, closes the following circuit to energize the cut-off relay 1020f the calling line: free pole of battery, relay 102, conductor 134. conductor 135, test multiples 110, test brush 127, conductor 136, arm 4 and its third contact to ground. Relay 102, in attracting its armatures, deenergizes the line relay 100, which, in retracting its left armature, removes the calling condition from the multiples 110 of the calling line in the finders in which it appears, and in retracting its right armature, removes the calling condition from the multiple commutator segments 111 of the calling group. Arms 2 and 3, in moving into position 3, energize a relay 137 over the following circuit: free pole of battery, left winding of relay 137, conductor 138, talking conductor 139, arm 2 and its third contact, conductor 140, brush 125, terminal 128, conductor 104, telephonic apparatus at substation A, conductor 105, terminal 129, brush 126, arm 3 and its third contact, conductors 141, 136, right winding of relay 137 to ground. Relay 137 energizes and interposes a break in the circuit of the finder release magnet 143 before the side-switch arm 5 is closed sufiiciently long to permit the energization of such release magnet. Relay 137, by attracting it armature, energizes a slow relay 144 over sideswitch arm 5 and its third contact. Relay 144, in attracting its armature, interposes another break in the circuit of release magnet 143. The relay 137 may be the stepping relay of the first selector, or in the case of a system where the line finders merely distribute calls to idle operators, may operate a calling lamp, whereupon the operator may complete the connection in any suitable manner.

Going back to that point in the operation where the escape magnet 122 released the side switch into position 2, when brush 121 reached grounded calling group segments 111, arm 6, in moving into position 2, shunts out relay 114, which, in retracting its armature, connects in-starter wire 132 to conductor 116, which conductor is connected over arm 1 in this position, through slow relay 146 to out-starter wire 131, and from thence to relay 115 of the next idle finder. If, when relay 114 retracts its armature, the ;in-starter wire 132 is connected to free pole of battery, a circuit is closed to start the next idle finder with which the out-starter wire 131 is associated in search of the line whose call caused such connection to battery of conductor 132. The circuit may be traced as follows, assuming the finder shown to belong to the group initiating such call: free pole of battery, armature and front contact of relay 114, conductor 116. arml and its third contact, slow relay 146, outstarter wire 131, in-starter wire 132 of the finder shown, armature and back contact of relay 114, conductor 116, arm 1 and its second contact, slow relay 146, out-starter wire 131, in-starter wire 132 of the idle finder, armature and back contact of relay 114, conductor 116, arm 1 and its first contact, conductor 117, left winding of relay 115, conductor 118, armature and back contact of the primary magnet 119 of such finder to ground. The magnet 119 and relay 115 of such finder will now interact to finder will energize and release the side switch into position 2, in which position the secondary movement of the shaft will take place to drive the positioned brushes over the multiples of the calling group, as already described.

The brush 121 is keyed to the shaft 120 as shown to rotate therewith. However, such brush does not partake of the vertical movement of the shaft, but remains in contact with the calling group commutator segments 111. This is necessary in order to maintain relay 114 shunted out; otherwise this relay would reenergize upon the first secondary step, and disconnect the in-starter wire 132 from conductor 116 leading to the outstarter wire 131.

A slow relay 146 is provided for each finder. The function of these relays is to interpose a break in the circuit of the release magnets of the finders with which they are associated, while a finder beyond is operating over a circuit passing through sideswitch arms 1 and the third contacts of such finders, since if one of these intermediate finders releases during the operation of the finder being set, the side-switch arm 1 of such released finder will, in moving back to its first contact, upon the energization of the associated release magnet, disrupt the stepping circuit.

What is claimed is:

1. In a telephone exchange system, the combination with telephone lines, automatic line finder switche to which said lines are multipled in groups, a starter wire for associating an idle finder with said lines, means adapted upon the initiation of a call to give said finder a primary movement to place the same in operative relation to multiples of the calling group, and means for automatically giving said finder a secondary movement to connect with the calling line multiples, of means actuated upon the termination of the primary movement to extend the starter wire to the next idle finder.

2. In a telephone exchange system, the combination with telephone lines, automatic line finder switches to which said lines are multipled in groups, stepping magnets for giving said finders a primary and secondary movement, a starter wire for associating an idle finder with said lines, means adapted upon the initiation of a call to operate said primary stepping magnet over said starter wire, and means for operating said secondary stepping magnet automatically upon the termination of said primary movement to Copies of this patent may be obtained for cause said finder to connect with the calling line, of means actuated upon the termination of the primary movement for extending the starter wire to the next idle finder.

3. In a telephone exchange system, the combination with telephone lines, automatic finder switches to which said lines are mul-i tipled in groups, primary and secondary stepping magnets for said finders, a starter wire for associating an idle finder with said lines, and a line relay adapted upon the initiation of a call to place a calling condition upon the test multiples of the calling line in such finders and upon the multiple group segments of the calling group in such finders, of a starting relay energized upon the operation of said line relay to interpose a break in the incoming end of said starter wire and to operate said primary stepping magnet over a portion of said starter wire, and a brush carried by said finder adapted when the calling group segment is reached to stop the operation of said primary magnet and to deenergize said starting relay to reconnect the incoming end of said starter wire to the outgoing end thereof.

4. In a telephone exchange system, the combination with telephone lines, automatic line finder switches to which said lines are multipled in groups, side switches for controlling said finders, escape magnets therefor, primary and secondary stepping magnets for said finders, a relay 114, a starter wire for associating an idle finder with said lines over a back contact of relay 114 and an arm of the associated side switch, a line relay adapted upon the initiation of a call to place a calling condition upon the multiples of the line in the finders in which it appears and on the calling group segments in such finder and to energize relay 114 to interpose a break in the incoming end of said starter wire and to operate said primary stepping magnet over a portion of said starter wire, of a brush carried by said finder adapted when the multiple calling segment is reached to shunt out said relay 114 and operate the escape magnet 122 of said side switch which releases the side switch into position 2 to close the circuit of said secondary stepping magnet, said relay 114 at its back contact reconnecting the incoming section of the starter wire through said side-switch arm and its second contact to the out-starter wire.

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

ALBEN E. LUNDELL.

five cents each, by addressing the Commissioner of'Patents, Washington, D. G.

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