US1537137A - Measured-service telephone system - Google Patents

Description

May 12, 1925. 1,537,137

R. uAss MEASURED SERVICE TELEPHONE SYSTEM Filed-June 6, 1922 'MvenfonfPa/ph L. 00486.

Patented May 12, 1925.

RALPH L. QUAss, o-rrmwrnonnre, NEW JERSEY, Ass'renoit TO WESTERN ELEermo" COMPANY, mconronsrse, or NEW YORK; 1v; Y.,'

om n.

oonro-nerron or new Yomr.

fi eness-isms TELEPHONE SYSTEM.

Ap 'fjl ihfi on filed June 6',

To (122 mm it only eel-em:

v it known that I, Rnti ri L. Q ms's', a citizen of the" United "Stat tes, residin at Haiwthorne, in the county ofPessaticf te-te' of New Jersey, have invented certain new and trs'efnl Im rovements in Meesured- Service Telephone Syst'ei'ns, of Which the following is a; full, clear, concise, ztfid exact p sni- This intention relates to euro-mus tele' phone systems and more specifically to a controlling circuit for a measur edsertice device or meter in" systems of this type.

The intention iseii iliiproi einent' over the s stem of Patent No. 2% 1921*,to John Wicks. In the system of that patent a'n' electrioztl'ly poldrized relay is proiided in the trunk circuit which rem inns inert condition holds operated slow to re'l ea'se relay which at back con tact 'I'neintains the meter circuit 'openuntil tliecztlled party answers. As the circuit is intended to operate this polarized relay will not rem 21in operated on momentary reversals of the current flow caused by ringing beck over thetrunk in re'i'rertive calls long enough to release the slow relay to cause it to close the meter circuit, but when the "current in the trunk is permanently reversed by the response of the calledp'arty, the slow relay circuit is opened long enoughto release it to close the meter circuit. However, due to the fact that the polarized relay is electricelly polarized, said relaiy will 'opeizit'e' if the ringing current is out ofi' on that part of the wave which assists the polarizing winding of the relafyand the relay will re main operated by the, polarized winding.- Thus the slow relay will be released long enough to close the nieter'eircuit' and falsely records, call. r 3

One of the features of this invention the provision of a biased permanentlypolar ized relay instead of' an electrically dn1--- ized relay to control the meter circuit. The slow relay is held operated to open the meter circuit by a circuit, including 21; normal Contact of this ermanentl polarized relay. Thus even though the ringing" current sto s on that part of the we-vew1- ich causes t e current in the polsrriiedrelziyto ,37930'68, issued Ma with which 1922. sees no. 5661,2991

op e fzi t t'ion 'of the meter because the instant the ringing" current is cut; or? the armature of the polarized relay is restored to its no'rinal s it, this oes get causes raise apertposition,*reclosing the circuit of the slow i relay before it can releise to close the inti circuit; M I A Another feature of the inVentionr e'li-tes to" an iniproved r'nezins for o'perztting the sec ondary linens'witch in at systeni wherein meters are einployed, and resides in e i'itcii'it arrzing'enient which obviates the possi bility' of the priniziry line switch rleesirig prein'atdrely. I r i In z'lc'cordince with this feature as the iiive'ntion the circuit for the operating winding of the secondary line switch includes at winding ofthe meter and contacts closed the prirnary line switch in seizing the sec on'dary line switc h, w'liereby the'secondarj line switch immediately groundto' be pieced on tlie' release conduc torl'ead'ing hack to the primary line switch The meter magnet is nn -rginal end'does not operate in the operatoperates to canse in'g circuit for thesecondery line" switch.

However, upon the response of called Vp'ztrt'y an operating circuit for said meter magnet is closedto cause the cell to he ch iirged'. V t

Referring to" the drawing", rising hut at single sheet only so much 0 =1 mirerh ri telephonesystem is shownes is necessary to comprehend the invention. efeie'nce should be ade to the said VVioks patent for the detailed op'erzition of the circuits the invention is not directly concerned. 7

It" is thought that the invention will be most readily understood from detail-ed descrijjtion oft-he operation of the circuits.

winding 3 to attract the plungerzuid close the springs, 5 6 tiid 7 in contact to extend the line circuit to secondary line When a subscriber at substation A re' Iii (ill

switch D in the well known manner as described in said Wicks patent. The relay 2 is disconnected from the line by the operation of the pull-in winding 3 but being slowto-release maintains the circuit of winding 3 closed until ground is supplied to the holding winding 8 over the release trunk 14 from secondary line switch D. As soon as springs 7 close contact a circuit is closed for the pull-in winding of the secondary line switch, as follows: left winding of meter 9, springs 7, conductor 40, contacts 33, 100, 3 1 of polarized relay 11, release conductor 14, conductor 35, contact 101 of slowto-release relay 10, conductor 36, pull-in winding 12 of the switch D, contact 19, slowto-release relay 13 to battery. A

The left winding of the meter magnet 9 18 of such low resistance that it will not operate in this circuit. The pull-in winding 12 and slow release relay 13, however, operate in this circuit. The slow-to-release high resistance relay 10 operates in a circuit which branches off at point 37 from the circuit previously traced. Relay 10 at the continuity contact 38 maintains the circuit for the pull-in winding 12 and relay 13 after it is broken at contact 101. The left winding of the meter magnet 9 is marginal as stated and cannot operate in the circuits so far traced. Relay 13 energizes to connect ground to the release conductor 14 connected to holding winding 8 of the operated primary line switch C. Winding 12 operates to plunge the secondary line switch and close in contact the pairs of springs 15, 16, 17, 18 to extend the calling line to a first selector E. The winding 12 in operating opens contact 19 and connects itself in se ies with high resistance winding 20 to the grounded right armature of slow relay 10. Before slow relay 13releases due to the opening of contact 19 a holding ground is applied to release conductor 21 y from the selector E as shown and described in detail insaid lVicks patent to hold the switches C and D set, and to cause the seized selector E to test busy.

The selector E is now set under control of the dial 23 to pick out an idle connector H, whereupon the connector is seton the called line. The selector E- and connector H are not shown in detail since they may be of the type shown and described in the said Wicks patent.

lVhen the telephone is removed from the hook at substation B relay 24 operates, reversing the direction of the current flow in the calling line and trunk, this circuit including relay 25 and polarized relay 11.

The polarized relay 11 operates due to this reversal and shifts its armature to open the circuit of slow relay 10, which in retracting its right armature substitutes ground from the trunk release wire 21 over conductor and contact 101 for the ground on said armature, to hold the secondary line switch 1) set. In retracting its inner left armature it closes an operating circuit for the meter as follows: battery, low resistance 39, inner left armature and normal contact of relay 10, contact 2?, conductor 40, contact '7, conductor 1-1, left winding of meter magnet 9 to ground. The meter magnet 9 energizes in this circuit and advances the counting train 29 one step to charge the call against the calling party. in closing its frontcontact the meter magnet locks itself by its right winding o-ver conductor 30 and spring 4: of the switch C to the grounded release conductor let, to prevent a second operation of the meter for the same connection.

The squares marked 31, 32 indicate the primary and secondary master switches, but since these switches do not form any part of the present invention and their operation is well known, they need not be described.

It will thus be seen'that the present invention provides a metering circuit'wherein momentary reversals of the current in the trunk, as for example, in ringing back on the line in the case of revertive party line calls, or when ringing current is sent back over the line for bell adjusting purposes, the polarized relay in the trunk through which such current passes will not cause the operation of the meter magnet and thus falsely operate the countin train, because the polarized relay 11' ill always restore its relay armature to the position shown after a temporary reversal before the circuit of the slow-to-release relay 10 has been opened long enough to cause its release.

It will also be apparent that the means for operating the primary and secondary line switches is an improvement upon the said icks patent for the reason that the operat ing circuit for the pull-in winding of the secondary line switch is closed as soon as the primary line switch closes its contact 7. The slow relay 13 of the secondary line switch thereupon operates to ground holding conductor 21 to maintain the primary line switch set. In the said Wicks patent the circuit of the pull-in winding of the secondary line switch is not led directly through contacts of the primary line switch, but the primary line switch must first opcrate a relay which in turn closes the operating circuit of the pull-in winding 11 of the secondary line switch, and this relay, although fast in itself, has its complete encrgi' zation delayed by the fact that its circuit include a low resistance meter magnet.

The circuit arrangement of applicant eliminates this time interval, and shortens by that much the period between the plunging of the primary line switch and conseloo quent opening of the circuit of the line relay 2, and the placing of ground on the holding winding by relay 13 to hold the primary line switch set after the relay 2 releases.

What is claimed is Y 1 1. In a telephone system, a calling line, a meter associated with said line, a circuit for extending said line, meter operating means associated with said circuit said means mentary operations of said relay from be-;

coming effective to render said first means operable. V i

3. Ina telephone system, telephone lines, primary and secondary line switches, a meter for each of said lines, a circuit in-. cluding a Winding of said'meter for oper' ating said secondary line switch, means in said primary line switch for controlling said circuit, said meter being constructed and arranged so as to remain unoperated upon operation of sald means, and additional means forsubsequently causing said meter to operate. v

4:. In a telephone system, telephone lines, primary and secondary line switches, a circuit including said switches, a meter con trol relay in said circuit between 'said' switches, meters for said lines, a circuit for operating said secondary line switch including a winding of said meter, a contact of said primary line switch, a normal contact of said control relay, and the operating magnet of said secondary line switch, said meter being constructed and arranged not to operate in said circuit, and means for subsequently closing an operating circuit for said meter.

5. In a telephone system, telephone lines, primary and secondary line switches, a meter for each line,means includinga relay for operating the meter, a circuit including a winding of said meter for operating the secondary line switch, means in said -primary line switch for controlling said circuit, said meter being constructed and ar ranged so as to remain unoperated upon operation of said lastrmeans, and means responsive to a called line in answering for causing the relay to operate said meter.

6. In a telephone'system,telephone lines, primary and secondary line switches, meters for said'lines, a meter control relay, a circuit for operating said secondary line switch including a winding of said meter and controlled by the primary line switch, said meter being constructed and arranged not to operate when said CHCllllLlSQlOSQd,

an operating circuit for said meter, means i for operating said meter control relay to close, one. point in said circuit, and means controlled by said relay for delaying the complete closure of the meter circuit by holding said circuit open at another point.

7. In a telephone system, telephonelines, primary and secondary line switches,meters for said lines, a polarized relay,-a circuit for operating said secondary lineswitch including a winding of said meter and controlled by the primary line switch, said meter being constructed arranged not to operate when said circuit is closed, means for reversing the current upon the complet on of the connection to operate said polarized relay to close said meter circuit at one point, aslow relay, a circuit therefor opened when said polarized relay operates, said slow relay upon its deenergization closing said meter circuit at another point to operate the meter. 7 p a 8. In a telephone system, telephone lines, primary and secondary line switches, call registers for said lines, an operating magnet associated with each call register, a circuit closed by the primary line switch in operating for operating the secondary line switch, said circuit including the call register magnet of the calling line, the register magnet being constructed and arranged so as to remain unoperated when said circuit is closed, and means for subsequently causing said register to operate.

9. In a'telephone system, telephone lines primary and secondary line switches, meters forsaid lines, acircuit including a winding vof said meter for operating said secondary line switch, means in said primary line switch for controlling said circuit, said meter being constructed and arranged so as to remain unoperated when said circuit is closed, and means in the primary line switch including a polarized relay for subsequently causing said meter to operate.

10. In a telephone system, telephone lines, primary and secondary line switches, a meter for each line, means including a polarized relay for operating the meter, acircuit including a winding of said meter for operating the secondary line switch, means in said primary lineswitch for controlling said circuit, said meter being constructed and arranged so as to remain unoperated when saidcircuit is closed, and means responsive to a called line in answering for causing the polarized relay to operate the meter. V, In a telephone system, telephone lines,

primary and secondary line switches, call registers for said lines, an operating magnet associated with-each call register, a circuit closed by the primary line switch in oper atiifig for operating the secondary line switch, said circuit including-the call register magnet of the calling line, the register magnet being constructed and arranged so as to remain unoperzited when said cireuit is closed, and means includinga polarized relay for subsequently musing sald l'egisfer cooperate. V

12. A telephone system wherein current 10 reversals ofleng duration ure elnployefl for meter operation and current reversals 17f shortd nretion are employed for other Opera'- tionsgjcharacterized in this that means is provided for suppressing the effect on said meter of any reversal of short duration regardless of its current strength.

In vitness whereof, I hereunto subscribe my name this 5th day of June A; D1, 1922.

RALPH L. QUA'SS.

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