US1211044A - Signaling system. - Google Patents

Description

H. M. BASCOM.

SIGNALING SYSTEM.

APPLICATION FILED SEPT. 1. 1915.

1,21 1,044. Patented Jan. 2,1917.

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a plug l6, which releases the ciitoif storing this portion of the system to itsfnors mal condition; If, however,'the A-operatoriingthe multiple 'jacks 12 ofthe trunkhear this tone and understandthe condition 'of This in turn deenergizes the relay 23, re-

is'the first to disconnect, the cutoff relay .is .deenergized",-and upon the closure of itsback contacts 28 and 29, the line relay is at once energized overthe trunk by'means" of'th'e circuit first traced. Before-*theslow release relay has time to release, as a result of the opening. ofcontact 133 of the cutoff relay which is in its original circuit,'-a locking circuit is completed for -it by contact 2320f the line relay and includingits contacts 35 and 36 and the secondary-winding of the transformer24. 2 Relay 23 therefore holds the cir-' cuit of-the lamp 20 open: in spite of the closure of the break at theifront contact of theline relay, sothatthe line's'ignal is not-again displayed. A :characteristictone potential" is impresseduponl the sleeve: contacts of the jacks zll iand' .12 by the interrupter 26* and the" primary of transformer 24 through the secondary of u said transformer relay. con

tacts 86, 32 and 35, condenser 25'and conduc t0rt22. The central station operators test the trunk. Whenit; comes to the attention offthe private branch exchange operator 1 that she'hasfailed to disconnect, she withdraws the plug 17 openingthe circuit of the line. relay 19; This by breaking contact 32 I severe the locking ci'rcuitof relay 23, andthe trunk equipment is'a-gain normal I claim: q 1'. In-a telephone and a private branch exchange station, a trunk line extending between the stations,

connecting circuits for'cooperation with the trunk. at both stations, a line signal displayed when theiprivate branch exchange connecting circuit is joined to the trunk,

means for causingthe Withdrawalof said signal upon the connection of-the' central station circuit, with the trunk,'and means situated'at the" central stationfor preventing the signal from beingagain displayed when the central station circuitvis disconnected from'the trunk before the disconnection'of the private branch exchange circuit.

2. The combination with a telephone line,

of a line relay, a signal controlled thereby, a cutofi relay, anda slow releaserelay gov erned by the cutofirrelay for removing the w trunk'line extending between the stations,

signal from the control of the line relay.

3. The combination with a telephone line,-

.of a 'line relay, a signal controlled thereby, a cutoff relay, a slow release relayfor disconnecting the sign'alfromthe line relay, an

energizingcircuit for the slow release relays including a front contact ofvthe cutoff relay, and a locking circuit for the slow release relay extending through a front contactfof thelinerelay. v.; a

The ceinbiiiatio-n with a teleph o ne line,

of switching means for -connecting yvith and disconnecting iro opposite "extremitiesof' the line, and meansfor producing an audir I blesignal upon the line dependent upon the "disconnection of the switching meansin a 7 particular order.

5LInfatelephone system, tWo' line'joiningthe stations and having a conductor local to astation, switching means cooperating with the line atboth -stations;

and means-for'iproducing a signal upon the local conductor "of the line at one "of the stations dependent;v upon the disconnection of the switching means in a particular order.

6. I-na telephone system,two' stations,a

linejoining the stations and having a conductorfilocal to a station, switchin means;

of the stations upon-the disconnection of theg switching means at that station before the '7; In aftelephone disconnection ofthe switching means at the" n, 7 1 system, a central station and a private branch exchange-station, a? trunk line extendingbetweenthe stations and. havingia "local conductor at the central station, connecting circuits for;-co6peration f w with'thetrunk at both stationsyandmeans I for producing anaudible signal-upon saidj local conductor of the trunk "at-the central station upon the disconnection of the con- .7

= nectingcircuitat said station before discon f v nectionatthe private branch exchange. system, a central station find 8. The combination. with a telephone line,"

ofa line relay; a signal controlled thereby,

associated with the line by the slow release a relay:

a The assets with a ftieiihbaejiiae, i of switching means for connecting with and i disconnecting from opposite extremities' of theline, a visual signal associated-with: the.

- line, means governed bygthe line 1 switching I means forcausing the: displayof said signal, I

its operation upon-the order. of operation, of

: an audible signalfand means dependent for i I the line: switching means for .renderingithefl visual signal:inefi'ective and for associating the. audible signal with the'line.

10. In a telephonesystem, a central station and a private branch exchange Estation, a

connecting circuits for cooperation with'the trunk at. both stations, a line signal displayed ,when the 7 private branch :exchange T thesignal from being again displayed when the central station circuit is disconnected from the trunk before the disconnection of the private branch exchange circuit, and means for producing in the trunk a condition indicating the character of the connection thereto.

11. The combination with a telephone line, of a line relay, a line lamp controlled thereby, a cutofl' relay, a source of potential, and a relay governed by the cutoff relay for removing the line lamp from the control of the line relay and for associating the source of potential with the line.

In testimony whereof, I have signed my name to this specification in the presence of 15 two subscribing witnesses, this first day of September, 1915.

HENRY M. BASCOM.

Witnesses:

ERNEST W. UNAUGST, J. WILLIS HINES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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