US1851139A - Telephone system - Google Patents

Description

um v 3 3 8 R. L. STOKELY TELEPHONE SYSTEM Filed Sept. 23, 1930 En NFQQS um W338 65 W ammo March 29, 1932.

Patented Mar. 29, 1932 RAY L. STOKELY, OF FLORAL PARK, NEW YORK, ASSIGNOR TOIBELL TELEPHONE LABORATORIES,- INCORPORATED, NEW YORK, N. Y., A CORPORATION OF NEW YORK TELEPHONE SYSTEM Application filed September 28, 1930'. Serial No. 483,821. I

the call, and to simplify the circuit arrange ments for the controlof such meters in standard telephone systems. i I

Heretoforesystems have been proposed, in which a meter and circuit arrangement are so arranged that the meter may be added directly in parallel with the cut-off relay to any standard line circuit and controllable 15 over the sleeve circuit to remain in an unoperative condition, while ground is applied to the sleeve circuit for the operation of the cut-elf relay, and to operate each time the booster battery is substituted for the ground connection. I r

A feature of this invention is an improved meter and circuit arrangement which may" be added to'and controlled over a single con,-

ductor in the above manner According to this feature, themeter is provided with two windings differentially wound and marginal in character, and the circuit, arrangement is such that when" ground is substituted current in one winding becomes effective to cause the meter to release quickly. 7 In this manner the releaseof the'meter is assured after each charging operation without interfering with the operated condition of the cut-0d relay. a

This invention has been shown in the accompanying drawing applied to an automatic connection between a calling subscriber and a called subscriber through switches indicated in diagrammatic form.

Referring to this drawing the service meter 3 has been. shown associated with the cir-' cuftslof a calling subscribers line whose set is indicated at l. The connection may be established from this subscribe'rs line 45 through line finder LE, selector Sand consubscriber at 2 will now be described in con-' nector C to thecalled subscribers line, whose set is indicated at 2. These switches and associated circuits may be of the usual type employedin automatic telephone systems in which a ground connection is established .over the sleeve conductors, when the connection is extended therethrough. Control circuits for the service meter 3have been shown associatedwith the line ,finder LF containing certain interrupting devices used in the control. The interrupting device 5 may be arrangedto close through spring contacts connection to ground once every six seconds. For example, the ground connections may be closed for, one-quarter second andopened for five and three-quarter seconds The interruptfing' device 6 may be arranged to close connections to ground, for example,for onerquarterse'cond and leave these connections open for two seconds. The two interrupting e devices 5 and 6may be driven by any well known, time regulated, constantly driven power means. may be arranged to operate spring contacts under control of the stepping magnet 8-so The interrupting device 7 r.

thatthe connections are shifted once every sixtieth opertion of the stepping magnettS; The establishing of a connection between the calling ;subscriber at 1 and the called and ring conductors through the subscribers loop at 1. Relay 10 in operatingcloses a connection to ground at its armature and'front I contact to cause in the usual manner a line finder such asLF to connect with the call-f ing subscribers line and establish the usual ground connection on the slc ve conductor.

This ground connection now causes the operation of cut-off relay 11 by closing the circuit from battery, winding of this relay to round through the sleeve terminal and brush of the line finder LF. The circut for relay 10 is thereby opened at the left hand armatures and back contacts of relay 11 so that relay 1O releases and the connection is now under control of the ground on the sleeve of the line finder while relay 11 is held operated by this ground. The service meter 3 which is of a marginal character will not operate in this circuit closed from ground on the sleeve through its windings to battery 20.

The subscriber at 1 now dials the number of the desired subscriber and the connection is thereby extended through the selector S and connector C to the called subscribers line at 2 in the usual manner. Vhile this C()111'1C tion is being extended the ground connection on the sleeve conductor is also extended through to the connector in the usual manner. When the called subscriber answers the usual automatic ringing, by lifting the receiver off the switchhook, the talking connection is established through the tip and ring conductors between the two subscribers lines.

This talking connection now causes the operation of relay 12 which has a winding in each conductor. Operation of relay 12 initiates the functions of the control circuits for service meter 3, by closing a circuit for the operation of relay 13 as follows: battery, right hand winding of relay 13, armature and front contact of relay 12, inner left hand armature 16 and back contact of relay 13, right hand armature and back contact of relay 14, upper closed contacts of the springs controlled by interrupter 7 and to ground through the lower springs controlled by interrupter 6, when this latter interrupter closes this connection. Such a closure may occur any time within two seconds after the operation of relay 12. This circuit for relay 13 only causes it to partially operate to close a connection for its left hand winding through its right hand armature 15 and front contact to the ground on the sleeve conductor. As long as the original circuit for the relay 13 remains the left hand winding will be short-circuited, but when it is opened at the end of one-quarter second period, the short circuit is removed. The circuit for relay 13 will then extend from battery through its right hand winding, armature and front contact of relay 12, left hand winding of relay 13 and its right hand armature 15 and front contact to ground on the sleeve. Both windings are energized and the remaining armatures 16 and 17 of the relay are thereby attracted.

The contacts of interrupter 6 will now remain open for two seconds. At the end of this period the connections to ground are again established and a circuit completed for the operation of relay 18 from battery, winding of this relay, inner left hand armature 16 and front contact of relay 13, right hand armature and back contact of relay 14, upper normal contacts controlled by interrupter 7 and contacts controlled by interrupter 6 to ground. Relay 18 in operating opens the connection to ground for the sleeve conductor, from the line finder and the calling subscribers line, at its right hand make-beforebreak contacts and establishes a connection to a so-called booster battery 19 through the right hand armature and front contactover the sleeve through the line finder. The service meter 3 is thereby operated as follows: The windings of the service meter are in a series opposing connection with battery 20. \Vhen the booster battery 19, is connected through the inner right hand armature and front contact of relay 18, over the sleeve conductor of the line finder and the windings of the service meter 3 to battery 20 to ground the service meter 3 will operate as the battery 20 is of the opposite polarity to that of booster battery 19. The inductance of the right hand winding of service meter 3 is lower than that of the left hand winding so although the current in these windings produce opposing flux the meter will operate due to stronger flux in the left hand winding. The service meter in operating registers the first period of conversation. While booster battery 19 is applied by relay 18 the cut-off relay 11 will remain operated over the same circuit from the booster battery through the winding on relay 11 to the battery at the other end of this winding to ground, as this latter battery is of the same polarity as battery 20. Relay 11 will, therefore, operate regardless of whether ground or booster battery is connected to the sleeve.

Relay 18 also closes a. circuit for the operation of stepping magnet 8 from battery, winding of this magnet, the outer left hand armature and front contact of relay 18 to ground. The stepping magnet is thereby actuated and when it releases as hereinafter will become apparent it actuates the interrupter 7 for control of the associated spring contacts, to open the normal connection to ground through the lower contacts, to open the connection through the upper contacts and to close a connection to ground for its middle contact.

When relay 18 is released due to the opening of the connection to ground at the interrupter 6 after the one-quarter second period the service meter is deenergized and the ground. on the sleeve is restored to maintain cut-ofi' relay 11 operated. It should be noted that on the operation of the service meter 3 a circuit is completed at its armature and front contact to ground I This completes a circuit from battery 20 throughthe right hand winding of the service. meter" 3 to ground. This. circuit causes a current to 5 flow in the right hand winding in a direc.-.

ing lower than the inductance of the left hand winding. In fact the conditions may be such that very little if any change takes place inthe relative flux characteristics in the meter from that produced by the batteries 19 and alone. On the other hand when the boosterbattery 19 is'removed by the release of relay18- andground substituted in the sleeve circuit, the current in the left hand winding of the meter will be discontinued and-the current through the right hand winding which is in the opposite direction,

- will remain for a short period to hasten the release of the meter; In other words, the

flux produced by the right 1 hand Winding causes the flux produced :by the left hand winding to. be neutralized'more rapidly than would ordinarily be the casein a relay having a single winding and the servicemeter will therefore be released quickly.

A circuit will now be completed, due to the operation of the "contactscontrolled by interrupter 7 when'the magnet 8'releases relay 14 from battery, winding of this, relay, outerleft hand armature 17; and frontcontact of relay 13 to ground atthe' middle contact of interrupter 7. Relay 14 in operating causes, due to the release of relay 16, a second circuit to be completed for the stepping magnet 8 from battery, windingfiof the magnet, outer left hand armature and back contact of relay 1 8, inner right hand armature and front contact ofrelay. 14 to gground through the springs controlled Iby interrupter 5; As stated this interrupter causes a connection to be established to ground once every six seconds. The stepping magnet 8 will now, therefore,-be operated onceevery six secondsfor one-quarter second each time to control the'interrupter 7, until sixty steps have been taken by the stepping magnet 8 when the interrupter 7 has been rotated to 1 again restore the contacts to the normal condition. When this takes place the relay 14 will bereleased due to the opening of the circuits for this relay attire contacts controlled by interrupter 6, unless thecontacts of interrupter 7 arerestored at the time the time elapsed at this moment will be six'minon the release'of relay 18,ffor the operation of the circuit as contacts' controlled by interrupter 6 are closed in which case relay14 will bemaintained operated until these latter contacts are again opened, which will always be within the one-quarter second period. The circuit for maintaining relay 14; operated will in thiscase be extended from battery, Winding and right hand armature and front contact of relay"14,upper contacts controlled by-interrupter 7 to ground at the contacts controlled l by interrupter 6. The maintenance of relay 14, operated under these circumstances is to prevent the subsequent operation of relay 18 Y I to take .place for less than one-quartersec- 0nd. If on the-other hand the closing of the connection by interrupter 7 occurs when the connections through the contacts controlled by interrupter 6 are open, relay 14 will be released immediately. In either case the subsequent operation of relay '18 ,will occur within the period of two seconds and be maintained operated for a period of one-c quarter second.

It should be observed therefore that the utes since the operation of the service meter plus a few seconds which may vary depending on the time the called subscriber lifts r his receiver off the hook as compared with thepositions of theinterrupters 5 and 6 at thattimer If the conversation is to be maintained beyond this first conversational period, the operationsjust described will be repeated; In otherfwords,when relay 14 g is released and a connection to ground is 400 again established at the interrupter 6,relay 16 will be operated as heretofore described for one-quarter of a secondto again cause" the operation of service meter 3 to registera second conversational period. If-

the subscribers now release the connection during the second period, relay 12 will be released and thus cause the release of relay 13. .Relay 13 in releasingrwill close the cir cuit forithe operation of the stepping magnet back contact of relay 13 and'the middle closed 1 contacts of interrupter 7 to ground. When interrupter 7 is returned to normal, this connection to ground will be opened and the stepping magnet will not be operated further. connect-ion until the second period of conversation is ended and then releases it, relays 12 and 13'will release and when relay14'is released, no further actions take place in erated. r

VJhile this invention has been illustrated in 7 connection with but a single telephone system, it should be understood that it may,

readily be applied toa number of other. cir- 1301 In case a subscriber maintains the 120.

relay 18 cannot then be opcuit arrangements without departin from the spirit thereof which should be imited only by the scope of the appended claims.

What is claimed is 1. In combination, two sources of current, a. magnet having two windings, a circuit for said magnet windings, means for closing said circuit from one source to ground, said magnet remaining inoperative in said circuit, a second circuit for said magnet windings including both said sources, means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit, and a third circuit closed by the operation of said magnet for shuntin one winding and energizing the other winding of said magnet to hasten the release of said magnet when said first circuit is again closed.

2. In comibnation, two sources of current, a magnet having two windings, a relay, a circuit for said magnet windings and said relay, means for closing said circuit from one source to ground, said magnet remaining inoperative in said circuit and said relay operative in said circuit, a second circuit for said magnet windings and said relay including both said sources, means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit and said relay remaining operative in said second circuit and a third circuit closed by the operation of said magnet for shunting one winding and for energizing the other winding of said magnet to hasten the release of said magnet when said first circuit is again closed.

3. In combination, two sources of current, a magnet having two windings, a circuit for said magnet windings, means for closing said circuit from one source to ground, said magnct rcn Wining inoperative in sa d circuit, a second circuit for said magnet windings including both said sources, means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit, and a third circuit closed by the operation of said magnet and including one of its windings and the first source for energizing said one winding and for shunting the other winding when said first circuit is again closed to hasten the release of said magnet.

4. In combination, two sources of current of diflt'erent potential, a magnet having two windings, a circuit for said magnet windings, means for closing said circuit from the lower potential source to ground, said magnet remaining inoperative in said circuit, a second circuit for said magnet windings including both said sources, means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit, and a third circuit closed by the operation of said magnet for shunting one of its windings from the low potential source and for energizing the other winding from said low potential source when said first circuit is again closed to hasten the release of said magnet.

5. In combination, two sources of current of different potential, a magnet having two windings, a relay, a circuit for said magnet windings and relay means for closing said circuit from the lower potential source to ground, said magnet remaining inoperative in said circuit and said relay operative in said circuit, a second circuit for said magnet windings and said relay including both said sources, means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit and said relay remaining operative in said second circuit, and a third circuit closed by the operation of said magnet for shunting one of said windings from the lower potential source and for energizing the other winding from said lower potential source when said first circuit is again closed to hasten the release of said magnet.

6. In combination, two sources of current, a magnet having two windings, a circuit for said magnet including both windings in series with one source, means for closing said circuit to ground, said magnet remaining inoperative in said circuit, a second circuit for said magnet including both windings in series with both sources. means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit. a third circuit closed by the operation of said magnet for including said first source in series with one winding of said magnet to ground and for shunting the other winding to ground from said first source when said first circuit is again closed to hasten the release to said magnets.

7. In combination two sources of current, a magnet having a first winding of lower ampere turn characteristic and a second winding of higher ampere turn characteristic, a circuit for said magnet including both windings in series with one source, means for closing said circuit to ground, said magnet remaining inoperative in said circuit, a second circuit for said magnet including both windings in series with both sources, means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit, a third circuit closed by the operation of said magnet for including said first source in series with the lower ampere turn winding to ground and for shunting said higher ampere turn winding to ground from said first source when said first circuit is again closed to hasten the release of said magnet.

8. In combination, two sources of current, a magnet having two windings connected in series and difi'erentially wound, a circuit for said magnet including both windings in series opposing relation and connected to one source, means for closing said circuit to ground, said magnet remaining inoperative in said circuit, a second circuit for said magnet including both windings in series opposing relation and in series with both sources, means for substituting said second circuit for said first circuit, said magnet being operative in said second circuit, a third circuit closed by the operation of said magnet for including said first source in series with one winding of said magnet to energize said magnet and for shunting the other Winding of said i magnet When the first circuit is again closed to hasten the release of the magnet.

In'witness whereof, I hereunto subscribe my name this 19th day'of September, 1930,

RAY L. STOKELY.

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