US1849468A - Supervisory signaling system for toll telephone service timing - Google Patents

Description

H. ONISHI 1,849,468 SUPERVISORY SIGNALING SYSTEM FOR TOLL TELEPHONE SERVICE TIMING March 15, 193 2.

2 Sheets-Sheet Filed Dec.

mm T NL B 2 2 March 15, 1932.

H. ONISHI 1,849,468

SUPERVISORY SIGNALING SYSTEM FOR TOLL TELEPHONE SERVICE TIMING Filed Dec. 11, 1928 2 Sheets-Sheet 2 amnion Patented Mar. 15, 1932 I l 1 1,849,468

V UNITED STATES PATENT OFFICE l nnrxrcnr ONISHI, or KEIJQ; CHOSEN, JAPAN it v sornnvisonv SIGNALING sirsrnm non from, TELEPHONE-SERVICE r MING Application filed December 11, 1928, Serial No. 325,185, and in Japan December 28, 1927.

My invention relates to improvements in able mechanical connections. \Vhen the supervisory signaling systems for toll telemagnet is energized it drives the shaftof phone service timing, and particularly to the stepping switch to the extent of one step, system for making indication, before a toll and when deenergized the magnet is restored board operator, of the lapsing of one unit to normal without actuating the shaft and be- 155 time of conversation, a rated fee being comes ready for next stepping of the same. charged for such unit time. Any suitable meansmaybe employed, such as An object of my invention is to obtain a' pawl connected to the magnet and a ratchet means for giving supervisory signals to a toll wheel secured -to' the shaft. A supervisory board operator automatically when oneunit signaling switchA comprises a bank of con- 60 time of conversation is over. Another obtacts, O'to 29 inclusive, and a wiper 83,'while ject of my invention is to provide means for stepping switch B, for restoring theswitch automatically indicating the beginning and A to. its normal position, comprises a bank of lapsing of the unit time. A further object of contacts 0' to 29 inclusive, and a wiper 34.

my invention is to obtain means for energiz- The wipers 33 and 34 normally engage the 65 ing a plurality of supervisory signaling apcontacts 0. and 0 respectively, and when op paratus from a common battery, preventing erated, they are simultaneously or. synchro its undesirable momentary heavy discharge. nously driven by the magnet'M inthe direc- A still further object of my invention is to obtion shown the associated arrows,step"by tain means for automatically restoring the step, sweepingover the respectivebanks of 70 signaling apparatus to the normal position, contacts. 'i I r. after the toll telephone conversation is over. Amongithe'bank contactsof the switch A, I

There is many other objects of my inventhe contacts 25 to 28 inclusive are united into tion, which, together with the foregoing, a continuousstrip, and connected to a source will appear in the following description. In of energy V, which maybe a usual common- 75. order that the invention may be fully underbattery as is provided for the telephone exstood, there will now be described, by way of change service; All of the contacts of the example, and with reference to the accombank'B, except the contact 0', are'also electripa-nying drawings, wherein cally connected together, or united into a con Fig. 1 is a diagramshowing one emboditinuous strip, which is connected to a con- 8 ment of my invention, and Fig. 2 shows three ductor leading to the contact 31 of the key K. positions of the key K shown in Fig. 1. i Fig. A suitable interrupter 38-is connected be- 3 is a diagram showing another embodiment tween the last contact 29 of the bank A, and

M of my invention, and Fig. 4.- shows thre'e posithe current source V. In the drawings, the

"" tions of the key K shown in Fig. 3. interrupter 38 is shown as comprising a ro- 35 Referring to Fig. 1, the system is shownin tatable member, having a plurality of alterthe normal or non-operated position. The nately arranged contact segments 38 and inreference character K designates a manually sulating material 38", and cooperating with operable rotary key, having contacts 31 and a a pair of contact brushes. The rotatable 32, and a suitable handle member N. The member is driven by suitable means, such as handle member N may be'rotatedthrough 180' an electric motor 39. degrees of angle, in order to operatethe key D and F are relays, respectively having into three positions, viz., normal, start, contacted and f, and in combination, constiand stop positions, as shown in Fig. 2. V tute a relay-interrupter, the operationof L is a supervisory signal lamp, and M isa which will be hereinafter described. The restepping magnet which drives stepping sistance of the winding, as well as, the sensiswitches A and B, as hereinafter described. tivity, of the relay D are made much higher The magnet is of the known type, and is conthan those of the magnet M, so that the magnected, as will be understood, to the rotatable net M cannot be operated when itis enershafts of the stepping switches by any suitgized in series circuit with the relay D. V

In order totransmit driving cement impulses to the magnet M, there is provided a contactor C, a current distributer W, a distributer controlling device X,;a magnet T, and a relay-interrupter comprising two relays R and S. The contactor C is actuated by a rotatable cam 40, continuously operated by a clock mechanism 41, and is so arranged that the contactor C is intermittently closed at a at this time. When energized the relay R closes its contact n, whereby an energizing circuit for the relay S iscompleted, resulting in the closing of itscontact s. The relay S has a wellknown retarding'metal ring 42 disposed around its core, so that its operation is suitably retarded in order to secure a proper stepping operation of the magnet T. When the contact 8 is closed, the winding of the relay R is shunted out of the abovetraced circuit, and the magnet T is suificiently energized to drive the wipersand 36 of the switches NV and simultaneously, to the second contacts n and o of the respective banks W and X. y r

As the result of the closing of the contact s, the relay R is de-energized, to open the energizing circuit of the relay S. After a short time interval which is sufliciently long to permit the magnet T to operate properly, the contact 8 isopen, and the energizing circuit for the relay R is completed from the battery V, through the contact 1; and wiper 36 of the switch X, the windings of the mag- :3 net T and relay R in' series relation, to the ground.

Thereafter the relay-interrupter R and S repeat similar operations to periodically energize and de-energize the magnet T, which drives the wipers 35 and 36, step by step in S)11Cl11OI1lS1I1,'lI1 the direction shown bythe respective arrows. As illustrated, all of the contacts of the bank X, except the first one u, is made integral with the second contact Q1, and the wiper 36 is continuously connected to the battery V after the operation has started. The wipers 35 and 36 complete their one cycle of operation during six seconds, the time interval between every closing of the contact C. The wiper 35, therefore, engages the contact 191 at a rate of once for every six seconds, and current impulses are transmitted to thekey K connected to the contact p1. The duration of such engaging is determined by the rotating speed of the wiper 35, and

When the contactor C is closed, the

may be adjusted by the adjustment of the retarding ring 42. V

In a large oflice where a number of the set consisting of the key K and associated superall the supervisory signaling apparatus, protecting the common-battery V from any undesirable momentary heavy discharge,

It will readily be understood that the current distributer may be omitted, if a heavy discharge may be allowed, or there is only a small number of supervisory signaling apparatus, in which case the key contact 32 may be directly connected tothe contactor C.

y The system shown is disposed on a toll board, and is designed for supervising a three minutes toll conversation. The rated fee is charged for every three; minutes conversation, which time is called a unit time in the present description.

Now assume that the toll board operator has connected together the calling and called parties or subscribers, and allowed the conversation to start. The operator'then actuates the key K to the start position, to complete the energizing circuit of the magnet M at the contact 32. Consequently, as will readily be understood, current impulses are transmitted to the magnetM at every six seconds from the current distributer W, and by each impulse, the wipers 33 and 34 are driven one step in the direction shown by the arrows. After the 25th impulse is transmitted to the magnetM, the wiper 33 engages the continuous strip 25-28, and the supervisory signal lamp L is energized on a circuit from the battery V, through the strip 2528, the wiper 33 and the lamp L, to the ground E, and the operator is notified thereby that there has been lapsed 25 X 6 seconds, that is, 2 minutes and 30 seconds after the conversation was started, and that the unit time will be over by 30 seconds thereafter. The lamp L is kept energized until the last but two. or the 28th impulse is sent to the magnet M, and by the29th impulse, the wiper 33 is stepped to the contact 29, where the energizing circuit for the lamp L is transferred to the circuit including the interrupter 38, and the lamp L flickers in accordance with the operation of the interrupter 38. This notifies the operator that the unit time will be over at 6 seconds thereafter,

and the last or the 30th impulse actuates the magnet M to drive the wiper 33 to the normal K is kept in the start position, and'another cycle of supervisory operation will be efl'ected just in the same manner as above stated, and when the toll telephone is'rung 0fi',the opera tor actuates the key K to the normaPposition.

Whenthe toll telephone is rung 011' before the three minutes duration over, say, at such a time that the wiper 33 engages the contact 25, the operator may actuate the key K to the normal position, in order to have the apparatus restored to the normal position rapidly. At the normal position of the key K, with the wipers 33 and 34: at their intermediate positions, a driving circuit forthe magnet M is prepared from the battery V,

through the relay-interrupter D, F, the wiper V 34 and contact strip 1-29 of the switch B, the contact 31 of the key K and the magnet M, to the ground. The magnet M then receives driving impulses by periodic energization and de-energization of the relays D and'F, and consequent periodic opening and closing of the relay contacts d and f, the operation being similar to that of the relay-interrupter R, S, as hereinbefore described. The wipers In order to make'such deduction of the non-charged time interval from the total duration of the toll connection, the operator is to actuate the key K to the stop position. In this position, both of the contacts 31 and 32 are open and the switches A and B are kept standstill at intermediate contacts, say, the 24th contact of the'bank A and the corresponding position on the strip 129' of the bank B, respectively. When the fault is over, the operator actuates thekey K to the start position, and the wipers 33 and 34 are operated in the manner described, for the remaining period of the unit time.

If the unit time is other than three minutes, it will be readily understood that the system may be changed to meet with this condition by changing the number of contacts of the banks A and B, or the period between the successive current impulses transmitted from the contactor C. It will also be understood that a group of several supervisory devices may be connected to one contact 271, 722, 793, etc., of the current distributor V, directly or by intermediation of suitable relay devices.

In Fig. 3, a modified system is shown, wherein the supervisory signal lamp is once lighted at the beginning of the unit time, in order to notify the operator that the super visory operation hasstarted ina proper V manner, and in which like. reference characters are employed to designate similarparts shown in Fig. 1, except certain diflerences hereinafter pointed out. In this modifica- .tion, the key K is provided with'an additional contact 37 connected between the interrupter 38 and the contact 0. of the bank A, while the first contact 1 thereof is' connected to the second contact 392 of the current distributor W', and thecontact 26-29'of the bank A are united together and connected to the commonbattery V.

With the above arrangement, when the key K'is operated to the start position, in addition to thec'losure of the contact 32, the contact 37 is also closed; and a circuit is completed for the supervisory signal lamp L,

'from the batterythrough the interrupter 38,

the contact 37, the contact 0 and wiper 33.

of the switch A, and the lamp L," to the ground, and the lamp L flickers accordingly,

thus showing that the supervisory operation is started. y I i' Upon the first driving operation of the magnet M, the wiper 33 is stepped to the bank contact 1, and thelamp L is-exting'uished.

At this time, the wiper 35 of the current distributer W will have passed the bank contact ;01 to which'the magnet M is nowconneeted, and will sweep over the remaining bank contacts during the remaining time'ofthe six seconds" period. 1 j

At the time when'the operator actuates the key to the startrposition,if the wiper 1:19

35 is on the bank contact 170 or 11, there occurs the aboveementionedoperation, but if the. wiper 35has just'passed the contact p1, but I is coming to engage the next'contact 122, the

lamp circuit is instantaneously completed).

from the battery V, through thewipe'r35, the contact p2, the bank contact landwiper 33 f of the switch A, and the lamp L, .to the ground. Thelamp L is then lighted to'show the fact: that the supervisory operation is" properly started, but this lamp is extinguished as soon as the wiper 35 has passed the contact 792. Upon the 26th operation of the magnet M, the wiper 33 engages the bank contact 26, and the lamp L is therefore nergized over a circuit from the battery V, through the bank strip 26'29 and wiper '33 of the switch A, and the lamp L, to the ground; This'energizing circuit iskept com- ,plete until the last or 30th operation of the magnet is effected, thereupon the lamp circuit being transferred to the flickering circuithereinbefore-traced, to notify the operator that the unit time is over, as the wiper 33 'nowengages the original contact 0. a P

It will be noted that" there might have -occur-red a certain timeerror for the first unit time of three minutes, if the first impulse should not be sent to the-magnet Mat a time just after six seconds from the time when -With'predetermined time intervals theener- 'gizlng circuit of saldelectrlcal slgnal device 1 This error will be six seconds at the maximum which will occur 'if thefirst impulse is sent immediately after the key K is operated.

In order to minimize such errors, the period of operation of the contactor C may be made'shorter', say, 3 seconds, and the number of steps or bank contacts of the switches A and B doubled, and the maximum error will be reduced 'tothree seconds. 7 It will be readily understcodcthat the sequence 1 of energization and de-energization of the supervisory signal lamp L for obtaining the required supervisory indications may be modified'in various ways, by changing the connections of the bank contacts of the switch A among themselves and also with the source of electric current; It will also be obvious that the lamp L may be substituted by some other'suitable signal devices, and it is to be understood that such changes in the construction, form, arrangement and connection of the component parts of my invention may be made as shall fall within the scope of the appended claims. 7 Y

I claim as my invention 1. In a supervisory'signaling system for toll telephone service timing, comprising an electricalsignal device having energizing circuit, a stepping switch having a wiper and a bank of contacts, restoring means therefor having a wiper and a bank of contacts, and a magnet having an energizing circuit fordriV- 111g said wipers step by step, contaotor means adapted to be opened and closed at predetermined time intervals, a source of electric current connected thereto, and key means for controlling said energizing circuit for said magnet, the bank of contacts of said stepping switch being so arranged as to open and closein accordance with the operation of the wiper of said stepping switch.

I 2; In a supervisory signaling system for toll tele'phone'servicetiming comprising an electrical signal device having an energizing circuit, a stepping switch comprising a wiper V r and a bank of contacts for controlling the en- .ergizing circuit'of said electrical signal device, another set of awiper and a bank of contacts, and a magnet having a normal energizing circuit for driving said wipers step by step, a relay interrupter, key means for making driving connections between said rotary .m-agnet and said relay interrupter through said second set of wiper and bank of contacts,

Vcontactor means adapted'to be opened and closed at predetermined time intervals, a source ofelectricjcurrent for said magnet and relay interrupter, said key means controlling said normal energizing circuit of said stepping magnet.

3. In supervisory signaling system foretell telephone service timing, comprising an electherefor, a stepping switch having a wiper and a bank of contacts, means operable for restoring said stepping switches tonormal,

and having a wiper and a bank of contacts, and a stepping magnet, having an energizing circuit therefor, for driving said wipers step by step, contactor' means adapted to be opened and closed at predetermined time intervals, a source of electric current controlled thereby for said stepping magnet, key means for controlling said energizing circuit for said stepping magnet, the bank contacts ofsaid stepping switch being so arranged as to open and close said energizing circuit of the electrical si nal device with predetermined intervals,

b u I and said contactor means including a current distributing device for connecting said energizmg c1rcu1t for sald stepping magnet to said source at predetermined time lntervals once for one cycle of operation of said c0ntactor means; a

In witness whereof I affix my slgnature.

HEIKICI-II ONISHI.

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