US1293390A - Telephone signaling system. - Google Patents

Description

' WIT/7255 .5:

S. H. EVERETT.

TELEPHONE SIGNALING SYSTEM.

APPLICATION FILED MAR. 11, 1915.

1,293,390. Patented Feb.4,1919.

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TELEPHONE SIGNALING SYSTEM.

Specification of Letters Patent.

Patented Feb. 4, 1919.

Application filed March 11, 1915. Serial No. 13,696.

To an w/wm it may concern:

Be it known that I, SAMUEL HARRISON VERETT, a citizen of the United States, re- .at Brooklyn, in the county of Kings and tate of New York, have invented certain new and useful Improvements in Telephone Signaling Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to tele hone signaling systems and more particu arly to ringing circuits with which may be associated sources of ringing current of Widely different frequencies and relays for tripping or disconnecting the ringing current from the called line upon the response of the subscriber.

It is an object of this invention to provide a si naling circuit in which there is a relay which will operate on direct current or on direct current upon which is superimposed alternating currents of widely different frequencies, but which will not operate on alternating currents alone, of the frequencies used in harmonic signaling.

In accordance withthis invention, a signaling circuit is provided with an electromagnetic relay having a core upon which there is an energizing winding connected in the circuit and positioned intermediate the ends of the core and having closed circuit coils mounted on the core, one upon each side of the energizing winding. Preferably these closed circuit coils consist of large masses of copper. These masses are so proenergizing winding is so positioned that, when the energizing winding is traversed by both direct current and superimposed alternating current, the leak age effect upon the core due to alternating currents of the higher frequencies is re duced to such a point asto perm'it the operaticn of the relay but not to such a point as to permit premature operation on alternating currents of the lower frequencies.

his invention is illustrated in the accompanying drawing, in which-Figure l is a side elevation of a tripping relay em bodying this invention; Fig. 2 is a side elevation, partly in section, of, the tripping relay shown in Fig. l; and Fig. 3 shows the tripping relay of the invention in a multifrequency ringing circuit associated with the calling end of a cord circuit, and a subthreaded engagement with scribers telephone line to which the call mg end of the cord circuit may be connected.

As shown in Figs. 1 and 2, the tripping relay embodying the present invention con sists of a core 5, about which is placed an energizing winding 6 positioned intermediate the ends of the core 5. There is also mounted upon the core 5, closed circuit coils and 8, one on each side of the energizing winding 6.

These closed circuit coils 7 and 8, consist preferably of copper tubes of large mass. t is obvious, however, that these coils 7 and 8, could very well be made up of a plurality of annular disks or rings, or of bare wire.

he energizing winding 6, the core 5 and.

the closed circuit coils 7 and 8 n1ay be suitably separated by means of insulating mate rial 9. Near one end, the core 5 is provided with a collar 10, separated from the closed circuit coil 7 In the washer 11, there are terminals 15 and 16, suitably mounted to which are attached leads for the energizing winding 6.

he core 5 together with the above described parts mounted thereon is inclosed in' a shell 17 of magnetic material, openings being provided in the closed end 18 thereof with which register the terminals 15 and 16 and the end of the core 5. The core 5 is firmly secured to the end 17 by means of a nut 19 having screw the end of the A terminal 20, to which one lead of the circuit to be controlled is attached, is suitably secured to the core 5. open end. of the shell upon the shell a yoke 21 of non-magnetic material to which is -pivoted an armature 22 in operative relation to the end of the core 5.

end to a finger 26 mounted on the shell 17,

5, as in Fig. l. A ed on the armature 22 is electrically con-= nected to the terminalQO through the relay structure. A terminal member 29, to which is '{attached the other lead of the circuit to by an insulating washer 11. 75

18 of the shell 1 Near the so 17, there is mounted A spiral spring 25, secured at one contact spring 28, mountbe controlled, is mounted upon. but insulated 106 from the shell 17. i in the forward end of terminal member'29 which is bent, as shown in Fig. 1, is mounted an adjustable contact ing ringing key 49 connecting to one of the middle contacts of this key ringing current of the frequency to which the bell at the wanted substation is tuned. Suppose that the left hand alternate contact of key 49 Upon insertion of the calling'plug into the jack 35 of the wanted suhscrilaers line, a circuit is completed from battery 36 through the winding of relay 37, sleeve contacts of the calling plug and j aclrund the winding; or the usual cuter? relay 38 "to gra'iun l opera 'ngr relay 38, 'therehy rcmoving ti null ll relay from the limbs of the suhscriher telephone line. Current in l path also actuates relay 87 the above true; which complie a circuit from battery 30. through contact & of relay 3?, Contact 41 of relay (which is the tripping relay einhodying the present invention), contact 43 oi? relay 4.4:, and winding of relay 415 to ground, actuating relay 4:5, which opens the tip and ring strands of the cord circuit and connects the tip side to ground at contact and the ring side to the winding of tripping relay i2 through C(Hlilfiii 47. 3 there e generator of diilerent frequencies, each having; one side connected through interrupters 50, 30 theother side or" each generator being connected to normally open contacts of a locking ringing key B), A second interrupter 56 n'iay he provided for each generator, the two iuterruptcrs associated with each genorator being 50 related that when interrupter 50 closes the. circuit from battery 48 to the gcueru'h'ir. interrupter 56 opens the pan battery :8 to the open contact of ringing key if); also that when interrupter 50 closes the path from battery 48 to the open. contact of ringing hey i9, interrupter 50 opens the parallel path through the genera ive". With the iuterrupters associated with each gene ator so related, there are pro ided periods when direct current only is available at the ringing key alternating with periods when direct current upon which is superimposed alternating current availalilc at The ringing: lozy;

In luirnionic ringing systems, it is c0muion practice to use generators, which generate alternating currents of 16%, 33-5, 50 and 00?,- p. p, s., and these in Fig. 3 are respectively reircscntcd by reference numerals- 51, 52, 53 and 54;. After insertion of the calling plug into the jack 35 of the wanted line, the operator operates a button ol' lockallcl path from and a battery 4-8 to gro1u1d,-

has been closed, a. circuit is then closed fromv grounded battery 48, through interrupter 50, generator 51, left hand alternate contact of ringing key 49, winding of tripping relay 42, contact 4:7 of relay 45, ring side of line, bell 60, condenser 61, tip side of line and contact 46 of relay'4l5 to ground. It may be, however, that, when the left hand alternate contact ofringing key 49 is closed, the path I through interrupter 50 is open and that In Fi r.

, shown four alternating current us alcove described,

used in harmonic signaling.

through interrupter 56 is closed, in which case-ringing otthe hell 60 would not start immediately, Ringing starts, in this case, when interrupter 50 closes the circuit through the generator 51 and after interrupter 56fopens the parallel pahh. llliith a relation hetween intermrpters 50 and 56 such direct current, and direct current'witl'i alternating current superimposed "thereon are alternately connected to the suhscrihers line. The condenser 61 f at the suhscrihers station prevents the persage of direct current. Tripping relay 42' does not operate when in ser es with the he'll 60 and condenser 61. However, when the receiver is removed from the switchhook, a low resistance path closed, whereupon tripping relay 42 operates, opening the short circuit of relay 4-1. Relay 44 operates and locks up, short-ci'rcuiting relay 45, which releases to disconnect the Tinc'ing cun rent from the line. The removal of the receiver at a called suhscrihers station either during the period when direct current only is connected to the line or during the period when direct current with alternating current superimposed thereon is connected to the line causes the operation of tripping re lay 42.

'must meet very severe service requirements,

in that the relay must not operate when traversed by alternating currents of the frequencies used in harmonic signaling, but must operate the instant an alternating current hell and a condenser at the subscribers station are removed from the circuit, as by removing the receiver from the switchhook, and a path'is closed for direct current, or'for direct current upon which is superimposed alternating current of any of the frequencies A relay, embodying this invention has been constructed to meet the following conditions of service.

(1) It must operate when traversed: by;

direct current- ('2) It must opcnate when in series with a 1000 ohm line at the end of which is a ringer or hell tunedto operate on 66%- p. p. s. alternatin current and when. hraversed by mag-meme n slposed.

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In Witness whereof, I hereunto subscribe my name this 10th day 01 March A. D. 1915. 1-5

SAMUEL HARRISON EVERETT.

Vlitnesscs:

EDLER, K. L. STAHL.

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