US1846686A - Common battery telephone equipment - Google Patents

Description

Feb. 23, 1932. c, MacGREGOR COMMON BATTERY TELEPHONE EQUIPMENT 'vvvvvvvvvvl NVENTQ Charl Patented Feb. 23, 1932 TENT 9F rice 1 CHARLES M. MACGREGUR, OF CHICAGO, ILLINOIS COMMON BATTERY TELEPHONE'EQUIPMENT' Application filed February 20, 1930. Serial No. 429,878.

material changes in the switchboard or exchange, thereby materially reducing the number of intricate parts both mechanical and electrical now employed in the magneto type, and whereby the switchboard or exchange may be operated with greater economy than with switchboards of many more parts, relays, resistance coils, movable contacts, impedance coils, etc., which latter necessitate intricate wiring in the circuits, sub jecting the same to considerable trouble in maintenance and expense.

A further object is to provide an improved equipment of this character whereby the subscriber is enabled to hold the operators attention to his signal, whereas with the regular or ordinary magneto or old type of switchboard the subscribers signal was liable to be neglected, as the operator, in the course of her work could, it too many drop signals fell to please her, or to cause her extra work, place the drops back to normal by hand without plugging in the subscribers line jack.

It is another object of the present invention to provide improved means for preventing the return of the drop signal to normal until the plug is inserted into the line jack to establish the-desired connection, and improved means for holding-the armature arm (if such a construction is employed) of the drop signal up until the jack of the drop signal is plugged into, thus maintaining the I subscribers signal active until the required attention.

A further object is to provide an improved equipment of this character by means of the use of which the small towns or'a-reas will be furnished with thesame high-grade service that the larger manual switchboards give at the present time and at a much lower cost.

To the attainment of these ends and the accomplishment of other new and useful obhe is given tion of a telephone system,

jects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several partshereinafter more fully described and claimed and as illustrated in the accompanying drawing in which f v The figure IS a diagram illustrating a porsuch as one subscribers station, having a common battery switchboard equipment constructed in accordance with the principles of this invention, incorporated therein.

Referring more particularly to the drawing thereference character A represents a subscribers station, B astorage battery for the system, C a charge rectifier for the battery B, D the operators visual signal here shown as the usual magneto drop signal, E a drop coil, J one of theoperators switchboardacks, F the jack sleeve, R a double coil relay included in the circuit between the battery B and the drop coil E, P a jack plug,

L a supervisory switchboard lamp, PL a line pilot lamp, PR a pilot relay, and N an audible night alarm.

It should'be noted that the relay R is normally de-energized when the subscribers're- I ceiver at the station A is upon the hook and when. the subscribers line 10 11 is open.

When the subscriber removes his receiver from the telephone hook at station A an electrical circuit is closed at the switchboard, from the battery B, conductor 12, bus bar 13, conductor 14-, through the coil 15 of relay R, conductor 16 to the line 10, thencethrough the closed switch at the station A, line 11, conductor 17, coil 18 of the relay R, conductor 19 to .bus bar 20, back to the batery through conductor 21. V

The relay R will then be energized, causing the contacts 22-28 to be moved from their normal positions in engagement with the contacts 2'25 into engagement respectively wit the contacts 26-27. A current will now flow from the positive pole of the battery B'through the bus bar 13, conductor 28, coil or" the pilot relay PR, conductor 29 to a bus bar 80. Thence from the bus bar 80, through conductor 31 to the relay contact 26, through the contact 23, to the contact 22, through the contact 27 through the conductor 32, through the drop coil E, thence through the spring contact 33 on the jack J, through the ring 3% on the jack, thence through the conductor 35, through the conductor 11, through the coil 18 of the relay B, through the conductor 19 to the bus bar 20, thence through the conductor 21 to the negative side of the battery B, thereby causing the drop signal D to be released on the visual signal.

This signal D remains active, that is, the drop coil E will remain energized if a drop is used, until the switchboard plug P is inserted into the jack J by the operator to answer the subscriber at the station A.

The signal D will be permanently active whether the subscriber has hung up his receiver at the station A or not as the coil 18 of the relay R in this circuit acts as a holding relay until the plug P is inserted into the jack J. Upon the insertion of the plug into the jack J the contact between the spring and the ring 3 1 of the jack J will be opened by moving the ring spring 23 i out of con tact with the spring contact 33, thereby breaking or opening the drop coil circuit or lamp circuit as the case may be through the coil 18 of the relay R. When the subscriber now places the receiver back upon the receiver hook, the circuit is opened through the relay R, die-energizing the relay with the result that the spring contacts 22 and 23 will then move back to normal positions, that is out of engagement with the contacts 26-27 and into engagement with the respective contacts 2a and 25.

The insertion of the plug P into the jack J the natural occurrence and regular practice in all manual telephone switchboards to establish a connection to another subscribers line by the use of another switchboard plug wh ch is bridged on the plug P through the standard switch keys and cords. This pair of standard cords and plugs therefore completes the connection between the subscriber at the station A and another subscriber who has the same kind of equipment attachment as that used to complete the telephone circuit at the subscribers station A.

When the subscriber at the station A is using the telephone in connection with any other subscriber the plugs are inserted in the jacks as above indicated.

ll'hen the conversation is finished, both of the subscribers return their receivers to the respective hooks and thereby electrically open the line circuits by opening the switches atthe respective stations.

In every instance, as with the plug P inserted in the jack J when the line circuit is open, a supervisory lamp L is lighted for the purpose of signaling the operator that the conversation is finished, and the operation of the above supervisory lamp is as follows.

When the subscriber at the station A has removed his receiver from the hook and closed the circuit of the line and thus energized the relay R in the manner already described, the plug P is inserted in the jack J and no circuit will occur through the supervisory lamp L, because the relay R- will be energized and cause the contacts 22 and 23 to respectively engage the contacts 27-26, thereby opening the line to th supervsory lamp L. hen, however, the receiver has been placed upon the hook by the subscriber at either station and the circuitof relay R is opened and the relay then lo-energized, then current from the positive pole of the battery B will flow through the conductor 12, to the bus bar 13, through conductor 39, through supervisory lamp L, sleeve 38 of jack plug, sleeve F of jack J, line 3?, contact 25, contact 23, contact 22, contact 2%, conductor 36, conductor 19, bus bar 20, conductor 21, to negative side of battery B, thereby lighting the supervisory lamp L, and which lamp remains lighted until the operator releases or removes the plug P from the jack J.

It will therefore be manifest that it will be impossible for the operator to return the drop signal I), or render this visual signal inactive, without inserting the plug in the jack, as the relay B, when the receiver is removed at either of the stations will prevent the same, because when the receiver is removed trom the hook at the station, a circuit will be established through both of the coils of the relay as above described. But when the receiver is placed back upon the hook at the station a circuit will nevertheless remain established through one of the coils of the relay R, and this latter circuit will be continuously established through coil 18, whether the receiver is or is not upon the hook at the station. Such circuit being as follows: From battery B, conductor 12, bus bar 13, conductor 28, pilot relay PR, conductor 29, to bus bar 30, conductor 31, contact 26, contact 23, contact 22, contact 27, conductor 32, drop coil E, spring 33, jack ring 34;, conductor 35, line 11, conductor 17, through coil 18 of relay R, conductor 19, to bus bar 20, conductor 21, to negative side of battery B.

Furthermore, with this improvement the equipment may be attached to the present magneto type of telephone switchboard and at the same time will not only convert the magneto system into a common battery system but will dispense with a great amount or equipment and many parts that are now used in the present type of common battery switchboard of standard manufacture, and materially reduce the expense of maintenance.

It is also possible by the use of a common battery system designed for a L0 to 48 volt battery that there will be a greater ci'liciency over the 20 to 2% volt battery commonly used,

when charged with the more recent valve type of charging rectifiers.

\Vhat is claimed as new is 1. In combination a jack and'plug and drop of a telephone switchboard, a source of electrical energy, and a relay bridged across the subscribers line and one coil of said relay arranged in series with the coil of said drop and operating to maintain said coil always etlectve to maintain the drop against being rendered inactive, until the said plug is inserted in said jack.

2. In combination a jack and plug and drop of a telephone switchboard, a source of electrical energy, a multiple coil relay bridged across the subscribers line, one of said coils being arranged in series with the coil of said drop and operating to maintain said drop coil always effective to maintain the drop against being rendered inactive, until the said plug is inserted in said jack, and a supervisory signal device arranged in the plug circuit and controlled by said relay.

3. In combination a jack and plug and drop of a telephone switchboard, a source of electrical energy, bridged across the subscribers line, one of said coils being arranged in series with the coil of said drop and operating to maintain said drop coil effective to hold the drop against being rendered inactive regardless of the position of the receiver with respect to the hook until the plug is inserted in the jack, a supervsory visual signal in series with the jack plug, and means controlled by said relay for rendering said supervisory signal active when the subscribers receiver is upon the receiver hook.

l. In combination a. jack, a plug and drop of a telephone switchboard, a source of electrical energy, a relay bridged across a subscribers line, a supervisory signal in the jack plug line, said signal being maintained inactive at all times when the receiver is removed from the receiver hook, and means responsive to the action of the said relay when the receiver is placed upon the receiver hook for rendering and maintaining said supervisory si nal active until the ack.

5. In combination, a ack, a plug and a drop of a telephone switchboard, a multi-coil relay bridged across a subscribers line, one of the said plug is removed from coils ofsaid relay being arranged in series with the drop signal coil whereby the signal will be maintained against being rendered inactive when the subscribers receiver is removed from the receiver hook, until the said plug is inserted into the ack, the last said relay coil being rendered inactive by the insertion of the plug in the jack.

6. In combination, a ack, a plug and a drop of a telephone switchboard, a multi-coil relay bridged across a subscribers line, one of the coils of said relay being arranged in series a multiple coil relay with the drop signal coil whereby the signal will be maintained against being rendered inactive when the subscribers receiver is re moved from the receiver hook, until the said plug is inserted into the jack, the last said coil of therelay being rendered inactive by the insertion of the plug in the jack, a supervisory signal in the jack plug line, and means responsive to the action of said relay when the receiver is upon the receiver hook for rendering said supervisory signal active when the plug is in the jack. 7

7. In combination a jack and plug of a telephone switchboard, a subscribers signal on said board, and a multiple coil relay bridged across the subscribers line, one of said coils being arranged in series with said signal and operating to maintain said signal against being rendered inactive until the plug is inserted into the jack.

8. In combination a jack and plug and subscribers signal of a magneto telephone switchboard, a common battery equipment for attachmen therewith, embodying a multi-coil relay bridged across the subscribers line, one of said coils being arranged in series with said signal and operating to maintain said signal against being rendered inactive until the plug is inserted into the jack, a supervisory signal in the jack plug line, and means operating to render said supervisory signal always active when the plug is in the jack and when the subscribers receiver is on the receiver hook, until the plug is removed from the jack.

9. In combination, a jack and plug of a telephone switchboard, a subscribers signal on said board, a double coil relay bridged across the subscribers line, one of the coils of the relay being arranged in series with the said signal for maintaining said signal active and against being rendered inactive except by the insertion of the plug in the jack, a supervisory signal in the jack plug line, the other coil of said relay operating to control said supervisory signal and cause the latter to be rendered active only when the plug is in the jack and when the subscribers receiver is on the receiver hook.

In testimony whereof I have signed my name to this specification on this 17th day of February, A. D. 1930.

-CHARLES M. MACGREGOR.

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