US897239A - Telephone system - Google Patents

Description

No, 897,239. PATENTED AUG. 25, 1908.

H. G. WEBSTER. TELEPHONE SYSTEM.

APPLICATION FILED MAR. 5, 1906.

A/rm' 57 7 THE Nmawls PEIEKs (2a., WASHINOTDN. o c

UNITED STATES PATENT OFFICE.

Gr. WEBSTER, OF CHICAGO, ILLINOIS, ASSIGNOR TO MILO Gr. KELLOGG, OF CHICAGO,

ILLINOIS.

HARRY TELEPHONE SYSTEM.

Patented Aug. 25, 1908.

filed March 5, 1906. Serial No. 304,227.

Application series with a condenser 2, included in a normally closed bridge of the telephone line limbs 3-4 by the engagement of the switchhook 5 with the contact second bridge,

normally open and including the transmitter 7 and receiver 8,

T 0 all whom it may concern:

Be it known that I, HARRY Gr. Wnnsrnn, a citizen of the United States, and residing at Chicago, county of Cook, and State of linois, have invented new and useful Improvemerits in Telephone Systems, of which the is closed at the contact 9 by following is a clear, concise, full, and exact the switch-hook 5 whenever specification. removed therefrom;

The present invention relates to manual At the central o'ice, R designates the telephone systems generally, and more parpolarized repeating coil relay by which the ticularly to that type in which .the various line 3-4 is inductively united to the jacks telephone lines, extending to the central 0 10. This relay comprises a soft iron core 11 fice, are inductively united for conversation provided with suitable pole pieces 12 and a through the agency of repeating coils, interpermanent polarizing magnet 13 which carposed between the lines and their connection ries the armature 1 1, normally held in enterminals, and a link-circuit for conductively gageinent with the 'IlXGCl stop 15 by a spring interconnecting these termina s. 16, but adapted to engage the contact .17 in The principal o ject of the invention is to response to the energization of the relay. rovide a system of this type with a novel ar- The relay is also provided with two differen rangeinent of circuits and apparatus for contially arranged energizing windings. One trolling the usual line and supervisory sig of these, designated 18, is shown in two secnals.

In carrying out my tioiis connected respectively between the invention, I associate opposite poles of the battery 19 and the line a polarized repeating coil relay with each limbs S t. The other, designated 20, is telephone line. Each relay through its permanently connected to a circuit eXtend windings inductively unites the line. to its ing from the jacks 10 to grounr, either by terminals, and by its contacts, controls the way of the resistance 21 or the non-resistance path including the contacts 2223 of a control relay 24 under the direct control of the subscriber. This latter relay is provided with the winding 25, shown in two sections, connected respectively between the opposite poles of the battery 19 and the line limbs 3 4, in parrallel with the corresponding sections of the repeating coil relay win ing 18. The armature 1 1 is connecte. to ground, while its contact 17 is connected to the live pole of the battery 19 through the line lamp 26.

The equipment and the connections thus far described with reference to substation A are duplicated in connection with substation B, and the corresponding parts are there indicated by similar primed characters.

At the central office, connecting the jacks 10 single strand made up of sections 27 27 uniting the answering and calling pl and 28 respectively and being con uc ively separated a condenser 29, which by will permit the passage of voice currents but line signa. The windings are respectively under the control of the subscriber and operator-the former to energize the relay to cause the attraction of its armature, and the latter to deenergize it to cause he armature to return to its normal position. An additional relay, also under the control of the subscriber, is employed to cut resistance into and out of circuit with the associated line terminals, so as to cause the eflaceinent or allow the display of the supervisory signal upon the connection of the link-circuit to the terminal.

The character of the invention, together with its various features and advantages, will be more fully understood upon reference to the following detailed description taken in connection with the accompanying drawing, and the scope of the invention will be particularly indicated in the appended claims.

In the drawing, which illustrates diagrammatically a telephone system. constructed in accordance with the present invention, and B designate two substations which are connected to the central oflice C by suitable the link circuit for and 10 comprises a telephone lines. The equipment at substa prevent the passage of current from the battion A, which may be of any preferred type, tery 19. The supervisory signals, which consist of the lamps is here shown as comprising a call-bell 1 in 30- 50, are connected 50 the latter into effective circuit relation in the 6 ing 18 sufficiently to allow its armature 14 to lamp to cause its extinguishment. With 130 each in series with a corresponding impereturn, to its normal position, thusinterruptdance 31*31, between the live pole of the ing the circuit of the line lamp 26 to causeits battery 19 and the strand sections 27 and extinguishment. The current flowing over 7 respectively. The usual listening key 32 this circuit, however, will be insuflicient to 5 is adapted to complete a branch from the illuminate the supervisory lamp because strand section 27 to ground, including the .0 the presence of the resistance 21 in circuit. condenser 33, operators receiver 34 and While the listening-key'remains depressed, the operators receiver will be included in a e primary winding of the induction coil is I secondary circuit extending from the ground 10 included in a local circuit in series with the therepeating coil 35, through the seconda tip contact on the calling plug 28 and jack 10, repeating coil relay winding 20 and 15 ground. The strandsection 27 is also proresistance 21, to ground. Upon learning the vided with a ringing key 38 which normally wishes of the calling party, the operator will engages the contact 39 to maintain the con touch the tip contact of the calling plug 28 against the testing contact of the jack 10 to determine the idle or busy condition of the line. If the line is busy, a potential above that of ground will exist at the testing contact of the jack by reason of its connection through a multiple jack and a connected linkcircuit to the live pole of the battery. Consequently,upon touching the tip contact of the plug 28 to the jack, a flow of current will result through the tertiary winding of the induction coil 35, and the usual click will depressed into engagement with the contact 20 40 to connect the sleeve contact of the plug 28 to one pole of the calling generator 41,

25 substation A, desiring to converse with a party at substation B, removes his receiver from its hook, and thereby completes a cir ciut through the winding 18 of the repeating coil relay R. his circuit may be traced 30 from the live pole of the battery 19, through cation to her that the hue is busy. If the the lower section of the winding 18, line limb line is found to be idle, the operator will 4, the closed bridge at the substation, the insert the calling plug 28 into the jack 10 line limb 3, t e upper section of the winding and depress her ringing-key 38, thereby 18 to the grounded pole of the battery. At closing a primary circuit from the grounded 35 the same time, a circultis completed through side of the battery 19, through the batter the sections of the winding 25 of the control condenser 42, the calling generator 41, ringrelay in parallel with the sections of the winding-key contacts 40-38, plug 28, jack 10, ing 18, so that both the repeating coil relay winding 20 of the repeating coil relay R and resistance 21, to ground. The alternatin current supplied. by the generator 41 to this 10 40 attract their armature contacts. The at winding 18 of the repeating 0011 relay, the

line limbs 34and the call-bell lto actuate the latter. Before the call is answered by the party at substation B, and after the plug 28 has been inserted, a circuit through the supervisory lamp 30 will exist as follows:

from the live pole of the battery 19, through the impedance 31, supervisory lamp 30,

strand section 27, plug 28, jack 10, repeat ing coil relay winding 20, control relay contacts 2223 to the grounded side of the battery. By reason of the exclusion of the re- 55 10 and depress her listening-key 32 to detersistance 21., the flow of current through the mine the wishes of the calling party. The lamp 30 will be suficient to cause its illumiact of inserting the plug will close a circuit l nation and it will remain in this condition from the live pole of the battery 19, through until the call is answered at substation B. the impedance 31, supervisory lamp 30, Upon this latter event, a-circuit will be com- 60 strand section 27, plug 28, jack 10, repeating pleted through the windings 25 of the con coil relay winding 20 and resistance 21, to trol relay 24, which will energize the latter ground. The completion of this circuit will sufliciently to remove the short circuit from energize the repeating coil relay in opposiaround the resistance '21 and include the tion to the energization caused by the windlatter directly in' circuit with the supervisory 45 lamp 26 to cause its illumination, as a signal will insert the answering plug 28 into a ack subscriber for subsequently returning said the parties so connected, the supervisory relay contacts to lamps 30 and 30 will remain dark during conversation, but as soon as either party their normal position, thereby efiacing said signal.

hangs up his receiver, the corresponding 4. A telephone system comprising a telelamp will be illuminated, and the illumina phone line extending from a substation to a tion of both lamps will be a signal to the central ofiice, a connection terminal for said operator to disconnect. line, a re eating coil relay having windings Obviously, the batteries 19 and 37, here inductive yuniting said line to said terminal, shown separately, may be one and the same, a link-circuit for making connection to said and the various ground connections are to be terminal to establish a conversational cirunderstood as representing, equally well, cuit, means under the control of the sub connections to a common ofiice return. scriber for energizing said relay to cause a will be apparent also that certain alterations complete movement of its armature from and modifications may be made in the matits normal position, said movement being ter disclosed without departing from the under the sole control of the subscriber, a spirit and scope of my invention. 1, there line signal displayed in response to such fore, do not wish to be limited to the specific movement, a signal associated with said linkdisclosure, but aim to cover, by the terms of circuit, means operative upon the connection the appended claims, all such alterations and of said link-circuit to said. line to establish modifications. a circuit normally to display said signal, a l/Vhat I claim as new and desire to secure resistance, and an additional relay under by Letters Patent of the United States is the sole control of the subscriber for includ- 1. A telephone system comprising a tele ing said resistance in said circuit to cause the phone line extending from a substation to a eiiacement of said signal. central ofiice, a connection terminal for said 5. A telephone system comprising a tele line, a polarized repeating coil relay having hone line extending from a substation to a windings inductively uniting said line to central office, a connection terminal for said said terminal, a signal controlled by the reline, a repeating coil relay having windings lay contacts, means under the control of the inductively uniting said line to said terminal, subscriber for energizing said repeating coil a link-circuit for making connection to said relay normally to cause the display of said terminal to establish a conversational cirsignal, and means under the control of the cuit, means under the sole control of the operator for modifying said energizationto subscriber for energizing said relay to cause return the relay contacts to their normal a movement of its armature by closing a relative position. circuit through one of said repeating coil 2. A telephone system comprising a telerelay windings, a line signal displayed in rephone line extending from a substation to a sponse to such movement, a signal associcentral oflice, a connection terminal for said ated with said link-circuit, means operative line, a polarized repeating coil relay having upon the connection oi said link-circuit to windings inductively uniting said line to said line normally to display said link-cirsaid terminal, a signal controlled by said cuit signal by closing a circuit through the relay contacts, means under the control of a other repeating coil relay winding, a resistsubscriber for completing a circuit through ance, a second relay having its energizing one of said windings to energi e said relay to windings connected in bridge of said telecause the display of said signal, and means hone line and operative to include said under the control of the operator for comresistance in said link-circuit signal-displaypleting a circuit through the other relay ing circuit to cause the ei'liacement of said winding to modify said energization' to signal. return said relay contacts to their normal 6. A telephone system comprising a teleposition and thereby efi'ace said signal. hone line extending from a substation to a A telephone system comprising a telecentral office, a connection terminal for said hone line extending from a substation to a line, a polarized repeating coil relay having central oflice, a connection terminal for said windings inductively uniting said line to said line, a polarized re eating coil relay having terminal, alink-circuit for making connection windings inductive y. uniting said line to to said terminal to establish a conversational said terminal, a link-circuit for making concircuit, means under the control of the subnection to said terminal to establish a conscriber for completing a circuit through one versational circuit, a signal associated with of the repeating coil relay windings to cause said line, a signal associated with said linka complete movement of its armature, a line circuit, means operative upon the connection signal displayed in response to such moveof said link-circuit to said terminal to supment, a signal associated with said link-cirly current over a circuit including one of cuit, means operative upon the connection of the repeating coil relay windings norma ly said link-circuit to said line to complete a cirto cause the display of said link-circuit cuit through the other repeating coil relay signal, and' means under the control of the winding normally to display said signal, a resistance, and an additional relay under the control of the subscriber for including saidcause the return 0011 relay armature to etl'ace resistance in said circuit to of the repeating said signal.

7. A telephone system comprising a telephone line extending from a substation to a central oilice, a connection terminal for said line, a polarized repeating coil relay having windings inductively uniting said line to said terminal, a link-circuit for making connection to said terminal to establish a conversa tional circuit, means under the control of the subscriber for completing a circuit through one of the repeating coil relay windings to cause a movement of its armature, a line sig nal displayed in response to such movement, a signal associated with said link-circuit, means operative upon the connection of said link-circuit to said line to complete a circuit through. the other repeating coil relay winding normally to display said. signal, a resistance, and. an additional relay having its energizing windings connected in bridge of the telephone line and operative to include said resistance in said. link-circuit signal-displaying circuit to cause the ell'acement of said signal.

' 8. A telephone system comprising a telephone linefextending from a substation to a central office, a connection terminal for said line, a repeating coil relay having differentially arranged windings inductively uniting said line to said terminal, means under the control of the subscriber for supplying cur rent to one of said. windings to energize said relay to cause the attraction of its armature, means under the control of the operator for supplying current to the other winding to decrease said energization to allowthe arma I ture to fall back, a signal displayed in response to the attraction of the armature and efl'aced in response to its return.

9. A telephone system comprising a telephone line extending from a substation to a central office, a connection terminal for said line, a repeating coil relay having difierentially arranged windings inductively uniting said line to said terminal, a link-circuit for making connection to said terminal to establish a conversational circuit, means under the control of the subscriber for completing a circuit through one of the repeating coil relay windings, means operative upon the connection by the operator of said link-circuit to said. terminal to complete a circuit through the other repeating coil relay winding, means for displaying a signal in response to the closure of the subscribers circuit and for effacing said. signal in response to the additional closing of the operators circuit, a signal associated with said link-circuit, and means for displaying said. signal upon the closure of the said operators circuit only and for eflaeing said. signal upon the additional closure of said subscribers circuit.

10. A telephone system comprising a telephone line extending from a substation to a central olfice, a connection terminal for said line, a repeating coil relay having differentially arranged windings inductively uniting said line to said terminal, a link-circuit for makingconnection to said terminal to estab lish. a conversational circuit, means under the control of the subscriber for completing a circuit through one of the repeating coil relay windings, means operative upon the connection by the operator of said. link-circuit to said. terminal to complete a circuit through the other repeating coil relay winding, means for displaying a signal in response to the closure of the subscribefls circuit and for effacing said signal in response to the additional closing of the operators circuit, a signal asso ciated with said link-circuit, a resistance, means for displaying said signal upon the closure of said operators circuit, and means actuated by the closing of the subscribers circuit o include said resistance in said operators circuit to efl ace said signal.

In witness whereof, I hereunto subscribe my name this 3rd day of March, 1906.

HARRY G. WEBSTER.

Witnesses:

A. H. DYsoN, GEO. E. MUELLER.

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