US828218A - Telephone apparatus. - Google Patents

Description

BATENTED AUG. 7, 1906.

K. KOHN. TELEPHONE APPARATUS. APPLICATION FILED NOV. 20, 1903.

a SHEETS-SHEET 1.

I No. 828,218. -PATENTED AUG. 7, 1906.

K. KOHN.

TELEPHONE APPARATUS.

APPLIOYATION FILED NOV. 20. 1903.

a SHEETS-SHEET 2.

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N0- 828,218. PATENTED AUG. 7, 1906.

K. KOHN.

TELEPHONE APPARATUS.

APPL IIIIIIIIIIIII 0120,1903.

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AAAAAA Al UNITED STATES PA ENT oFFroE.

KoBr KOHN, OF NEW'YORK, N. Y.,'ASS1GNOR OF ONE-HALF o LOUIS A.

KSENSKY, DENVER, COLORADO. TELEPHONE APPARATUS- ivb. 828,218.

Specification of Letters Patent. Application filed November 20,1903. Serial'No. 181,944.

Patented Aug. 7, 1906.

To ail whom; it may concern:

Be it known that I, KoBY KoHN, a citizen of the United States, residing in the city, county, and State of New-York,have invented certain new and useful Improvements in Telephone Apparatus, of which the following is a specification. This invention relates to telephone systems; and the object of the invention is to provide means whereby when one subscriber on a telephone arty-line either calls central 2a in open circuits until a subscri er calls or is called, when his receiver-circuit will be closed and all otherreceiver-circuits on the line be prevented from being closed by the respective subscribers until; the calling or called subscriber has finished the conversation and central has restored all parts to normal position. I v The invention, which may be usedwith either the local-generator system or the central-energy system for calling, wilh be fully described hereinafter, reference being had to the accompanying drawings, in which Figure 1 is a diagrammatic view illustrating my invention as used in asystem employ-ing local generators for calling'central. ig. 2 is a plan view of the armature resetting apparatus. Fig. 3 is a 1 view showing the means for controlling the armature D mechanically by the movement of armature C". Fig. 4 is a diagram showing the devices for sendingcurrents over the main line-Wires b' the operator at central. Fig. 5 is a detail view showing means for preventin accidental movement of the armatures. Fig. '6 is a diagram illustrating my invention as used in conjunction with the central energy system.

It is .to be understood that the present invention ma beembodied in an a paratus which may o'rm an attachment to te ephones 50 at present iniuse or it may be a part of the telephone. In Fig. 1 I. have illustrateddiagrammatically the'devices employed at the central office andalso those for two stations a andb. It is to be understood, however, that theinvene two will be connected to the line-wires the same as a and two the same as b.

The line-wires are indicated by X and XX, and F is a' generator of any known style, one

of such generators being at each station, and 1 tlon'mav be used with four stations, of WhlCll when the generator is not in use its armature is cut out at F which may be considered its normal condition. p I p I 'In my prior application five magnetsA, B,

function of B being to close'the receiver-circuit at its station alter D is energized to close a circuit through B. In the present case the magnet Bis dispensed with, together with the circuits necessary to energize it from D, and themagnet D is utilized to directly close the 5 C, D, and E are employed at each station, the

receivercircuit at its station andbreak a v local circuit for a bell, in addition to perform ing its other function of" closing a circuit through central, as in the other application. By the omission of the ma net B and its circuits I am enabled to materially simplify and reduce the expense of the construction of the apparatus of the said prior application, and

ent invention.

subscriber desires to call .central, the gen- .erator F is operated and the circuit is closed i this is one oft-he. principal objects of the presat F thereby establishing a ,circuit as fol? lows: from generator F to Wire F magnet D," 1

wire D, brush D, contact D brush D, wire D brush A, contact. A brush A, Wire A" to the generator. This will result in energizing D and attracting its armature D, which re-' sults in engaging the contact G: with brushes B". Brush D will be disengaged from con;- tact, D and brush D be en aged with it.

contact H contact H wire H", brush contact H brush H", wire H wire X, wi re D brush D, contact D brush D, wire D, brush A, contact A, brush A, wire A, to genera- G and G contact B with brushes 13 and -9s Current from the generator w I then pass to 1 loo tor. The magnet H will thus be ener ized, V

and its armature H pivoted at 6, will e at-' tracted, thereby releasing the drop H to. notify central and. engagin' the contact H with brushes H", H", an H and the contact H with brushes H and H It also their brushes A and A, and this will prevent.

current being sent from any generator F throughits magnet D to close any other receiver-circuit on the line. v To operate the magnet A at station a, current will flow from, the battery H to wire 11?, brush H contact H brush H wire H 9, wire X, wire A brush A, contact A, brush A, wire A", magnet A, wire A brush A", contact A", brush A, wire XXX, to the ground, thence up wire H at central to brush H contact H brush H wire H to "battery Y t To operate magnet A at station I), current will flow from battery H to wire H brush H contactH brush H", wire H Wire H,

wire XX, wire A, brush A, contact A, brush A magnet A to the round and back to battery H at central, as efore described. Some of the current from battery H, which passes over wire H will pass through'mag net H to wire H spring-contact H, contact H wire H to the battery H thus keeping the magnet H energized after the, current from generator F has ceased, and thereby holding the armatu'r'e H? attracted until the circuit from battery H through said ma net -is broken, as will be hereinafter descri ed. A metallic circuit to central will also be established fcr'the receiver at the calling-station as follows: from wire XX to wire G to receiver G-to wire G brush G contact G brush G, wire G wire G to wire X, and the calling subscriberis thus enabled to talk with central, and all the other subscribers on the line are prevented from closin their own receiver circuits and cannot, t erefore, hear any conversation that may be carried on.

Fig.1 I have illustrated the receiver G supported on a hook G, connected to wire G The wire G is directly connected to the receiver, as is also a contact G When the receiver is removed from the hook, the latter will be drawn by its spring into engagement with the contact G and complete a-cir'cuit through the receiver from wire G to wire G.

e receiver-circuit will still be open, however, until either magnet D or magnet C is operated.

As shown the receiver-circuits are each provided with the usual secondary inductioncoil I in close proximit to the usual primary induction-coil J; but ese coils form no part of the present invention and are illustrated merely to show that my invention can be applied to telephones now in use without the necessity of mutilating them in anyway.

-When central answers the call from the person at station a, a jack or plug is inserted in H, which will force the contact-spring away from H thereby breaking the circuit from the battery H and deenergizing the magnet H which will release its armature, and the latter will be restored to normal position by the spring H The drop H? may also be restored to its normal position, and then the operator at central may withdraw the ack from H and permit the spring-contact H to engage H and then the circuit from the generator F at station a will be complete to enable the person using the phone at such station to ring on.

We will now assume that central desires to call up station I). A current will first be sent over lines X and XX to energize all the magnets A and cause them to attract their armatures A", and thereby cause the.contact E to engage brushes E and E and thereby establish a circuit ateach statlon from one or the other of wires XX or X to wire E, brush E, contact E 3, brush E ,-magnet E, wire E,-

ma net C, wire C, bell C wire 0 wire to the earth to central and then to the res ective wires X or XX. r

s before stated, it is intended to have four stations on the same line, and the bell C at two of the stations will be connected to the wire X and at the other two stations to the .wire XX. As shown at station a, the

bell is connected to wire X and at station I) to wire X-X, and we willassume that at'station c the connection is the same at at a and at d the sanie as at I). Now when central desires to call a stationsay bit is not desirable to up d; but as the current sent from cenrin 'tmi over wire XX will pass through the bell C at each of these stations one of the bellsis sent through C its armature C will be attracted and cause contact G to engage brushes G and G, and thereby close'the receiver-circuit at station b as follows: from wire XX to wire G, receiver G, Wire G brush G contact G, brush G ,'wire G, to

wire X. It will also close the generator-circuit at B, B", and B and central can then talk with the subscriber at station b or put him into communication with some other person who may wish to talk to him either on the same line or another.

It will be observed that the armature E ofthe magnet E is held retracted by a spring E and that the armatures of the magnets A, C, and D have no springs. The function of the magnet E is to reset the armatures of magnets A, C, and D after they have been attracted, as fully described in my said-prior application,- and the'spring E is of sufficient strength to prevent the armature E being attracted when the current for operating the bell C andmagnet C is passing through magnet E,-it requiring a stronger current to attract the armature E than it does to ring the bell C and erate magnet C.

In my said prior application whenthe armature E operated to restore the armature A to normal position the latter armature .was moved sufficiently to close a circuit'at A, A, andA before the armature E had fully completed its stroke, and this resulted in sending partof the-current intended for E from one of the wires X or XX through magnet A direct to the ground, which energized A and tended to pull its armature against the action of armature E and while this did not prevent the full operation of E it necessitated a stronger current than is necessary in i the present arrangement. As before described, the current through magnet A passes through brushes A and A and contact A to the ground, and the current to E passes through brushes E and E and contact E on armature A. When, therefore, armature E begins to move, it mechanically operates armature A andengages contact A with brushes A and A, and if contact was not broken at ARA", and A themagnet A would be energized and tend to attract itsarmature, and thus resist the action of E. The

partsare therefore so arranged that substantially at the same time as contact A is caused to engage brushesA and A contact A will disengage brushes A and A and no cur rent, or practically none, will pass through A, and the latter consequently will not resist the action of E. During the first part of the movement of E the current through E will also pass through 0, and. this. magnet will tend to resist the action of E but as the lat ter moves it will close a circuit at E E and E from magnet E to the ground, and magnet 0 and bell C will thus be short-circuited,

and; the magnet will offer no further resistance to the action of E. Of course as ar mature A is moved to normal position'the circuit for magnet E will be broken at E E and E; but another will first have been established at E E and E The means for mechanically operating the armatures D A9, and C by the armature E are illustrated in Fig. 2, where it will be seen that the arm which carries armature E9 is pivoted at 5 and extends for-some distance on the opposite side of magnet E. The arms which carry the armatures D", A", and C are respectively pivoted at 2, 4, and 3 and extend the under an enlargement 7 on arm carrying armature E. When either of the armatures D", A", or C attracted, its arm will engage the enlargement 7, and then if armatureE is attracted the enlargement 7 will press on such arms as have been moved into engagement with it and restore their armatures to normal position. this feature broadly in the present application, as it is so claimed in my prior applica tion.

Preferably the enlargement 7 will be provided with adjustable'screws 9 to engage the arms carrying the other armatures.

-It is desirable to provide some means for I do not, however, claim informing a person desiringto call when the line is busy that such is-the' fact, and I preferably em loy an audible signalfor this purpose, whic is operated by a current from the enerator F. As before stated, when a call 1s sent to central or from central all the magnets A on the line are energized and .attract their armatures, thereby breaking all the generator-circuits to central at A, A,'and A .and closing a circuit atK, K and K If now a person at a-station other than the one using .the lineshould operate his generator F, a current will flow from the generator to wireF, wire K brush K, contact K brush K bell- K, wireK", brush K contact K brush K", wire K brush K", con-, tact K ,"brush K", Wire K, wire A to generator, and the bell K will ring, and thus notify person that the line is busy. In my prior app ication the armature of [the magnet B carried a contact equivalent to contact K on armature D to engage brushes equivalent to brushes K and K", and the armature D thus performs another function performed by the armature of magnet B in my said prior application.

Various means may be devised for sending the necessary currents over the Wires X and XX by the operator at central, and in Fig. 4 I have shown apparatus which may be used for this purpose. Thus for sending the strongest current over the wires X and XX for energizing the magnets E, I provide a battery or other source of electrical supply S of the necessary capacity and provide a switchlever S, having contacts S and T, insulated from each other. Brushes S and S, adapted to be engaged by the contact S are respectively connected to wires XX and X; One

ole of the battery S is electrically connected by a wire S to the contact S and the other ole to the ground. When the switch-lever is moved to engage contact S with brushes S and S", currentfromthe battery will be sent over both line-wires XX and X throughv magnets E to the ground, as already described, and back to battery S. V A portion, of the same battery S maybe utilized for energizing magnets A, whlch do not re uire so strong a current as magnets E. T us the contact T is electricall connected by a wire T with a portion on y of the battery, as shown in Fig. 4. Two brushes T and T adapted to be engaged by contact T, are respectively connected to wires XX and X, and when switch-lever S is moved to engage contact T with brushes T and T current from a portion of battery S will flow over wires XX and X through magnets A to the ground and back to the battery S. The current forenergizing magnets C and bells C is preferably a continuous vibratory current, and in Fig. 4 I have shown one means for sending a current of this character over the lines X and Thus the line X is connected to a pivoted switch 0 by a wire 0', and the line XX is connected to-a similar switch O by a Wire A battery or othersuitable generator 0 is provided, and the positive pole thereof is connected to a contact adapted to be engaged by either of the switches O or 0 and its ne ative pole is connected to a contact O", a apted to be engaged by either of .7 the switches O or' O. A commutator is providedin each connection between said contacts and the battery, and the latter is connected to the earth.

If the switch 0 be rocked to' engage O, a

negative current will be sent over line X through magnets C and return by the ground to battery O If switch 0 engages 0 a positive current will be sent over line X and return through "the (ground to battery 0. By operating switch 2 the same effects take place over wire XX.

It may sometimes happen that after the operator-at central has operated a switch 0 or O to send either a positive or a negative current over the wire XX or X, as thecase may be, to energize a magnet C she may inadvertently in returning the switch to normal position move it too far andengage the other contact,- in which case a current of op? posite polarity would be sent over the linewe, and this would repel the armature that had been attracted and again break the receiver-circuit at G G and G, in which case the subscriber intended to be called would be unable to talk over the line.

ceiver-circuit shall be closed in any event,- the arm which carries the armature- (3 is pro vided with an extension 20, adapted to en-' age a similar projection 21 on the arm carry mg the armature D when both armatures are in their retracted positions. (See Fig. 3.) If now the armature (1 be attracted, it will cause the armature D to move toward its magnet D mechanically, and thereby close the receiver-circuit at G, G", and G It will thereafter make no difference if the armature C is repelled,- as stated above. The receiver-circuit will still be closed at G G and G and the person called can talk over the line. It will be observed that the armathe latter will be moved To compen sate for such accident and insure that the re V-shaped projection 26 on the end of the armature-arm .and'also a spring 28, having a V- shaped projection 27 to engage said projection 26.

In Fig. 5 the parts are shown in normal p0- sition in full lines, and it will be seen that thearmature is eldingly held away from the magnet. Wlilen, however, the magnetis energized, the spring 28 will yield and permit the projection 26 to pass by 27 to the position indicated in dotted lines in said figure,- and the reaction of the s ring will through the cooperation of the inc line surfaces of the two projections tend to move the armature toward the ma net and hold it there even if the magnet has een deenergized. The springs will also aid the armature 13 in resetting the armatures.

Referring now to Fig. 6, which is a diagrammatic view showing the apparatus at central and that at one station on a party-line in a central-energy system, it will be observed that the magnets A, O, D, and E are employed in substantially the same relations asin the system heretofore described. The generator F and its circuits are, however, omitted. In this casethe removal of the receiver G fromits su porting-hopk D will serve to send a signs. to central and automatically send a current from central through the magnet D to close-the receiver-circuit. Assuming now the receiver G is removed from the hook D,

its spring into engagement with a contact 9 and close a circ u1t as follows: from hook D to contact D,

wire. D, brush A contact A? on armature A,

brush A, wire D ma net D, wire D mainline wire XX,-through atteryM ,spri '-con'- tact M contact M, wire M, ma iiet M, line-wire X, wire'DK to hoo D. The closin of this circuit will energize magnets D and The magnet D will attract its armatureD and close its receiver-circuit at G G and G and break the local circuit for bell K at K, K and K.

The magnet M will attract its armature 'M and cause the contact M to engage the brushes M and M" and the contact M to engage brushes M and M". thus be established from battery M to Wire M magnet M, brush M contact -M, brush M wire M, to battery M and the current from ,wire' A circuit willf the battery will keep the magnet M energized to hold its armature attracted and keep circuits closed at M, M and M and at M M and M so as to absolutely insure the operation of all the magnets A on the partyline when current is sentover the lines X and XX from central to energize them, as before described in connection with 1. As soon as the magnets A. attract their armatures the circuits for magnets D will be broken at A, A and A and no further current can pass through these magnets from the line until the parts are restored to normal position.

As no generator is employed at the stations in the central-energy system, it is necessary to provide some means for ringing the bell K to indicate to a subscriber when the line is busy. As shown, I provide a battery L in the local circuit for the bell. When the armature A is attracted, the contact K7 will engage brushes K and K An open circuit with a break at D and D is then established, including the bell K and battery L, as follows:

from hook D to wire L, battery L, wire K bell K, wire K, brush K contact K brush K wire K brush K contact K brush K wire K brush K contact K brush K fwire K, wire D and contact D. If then the receiver be removed from its hook I), the circuit will be closed between D and D and bell K will ring.

So far as sending current from central over the wires X and XX for the magnets C .and E and hell 0 the operation is the same as already described in connection with Fig. 1.

It will of course be understood that when the armatur D" has been operated the circuit forbell is broken at K, K", and K The same is equally true with reference to Fig. 1,'where the generator F will not ring the bell K at any stationwhere the armature D9 has been operated.

The brushes A and A and contact A are so arranged that the armature A will nearly. complete its full stroke before the circuit for magnet D is broken at this point, and the brushes G and G and contact G are so arranged that armature D will make only a' small portion of its stroke before the receiver- This is circuit is closed at G, G and G. essential for the perfect o eration of the apparatus, since magnet gets its current through A, A and A and if the circuit was broken prematurely at this point the receivercircuit would not be closed at G G and G.

Without limiting myself to the precise construction and arrangement shown, I claim as my invention 1. In a telephone system for party-lines, the combination with the main-line wires leading from a central ofiice, of a series of telephone-receivers each independentl connected to the line-wires by an open e ectric circuit, a magnet and an armature at each station for closing the circuit of its receiver i only, and means at each station under the control of a person thereat for energizing the magnet at such station to first close its own receiver-circuit, and then close a circuit at the" central office for sending a current over the main-line wires to operate devices for preventing the closure of any other receivercircuit on the line, substantially asset forth.

2. In a telephone system for party-lines,

the combination with the main-line wires leading from a central office, of a series of telephone-receivers each independently connected to the line-wires by an open electric circuit,a receiver-circuit closer at each station including a magnet and an armature, a signal at the central office, and a generator at each station under the control of a person thereatfor energizing the magnet at its'own station only to close the receiver-circuit and also for operating the signal at the central office, and for closing a circuit at the central office for sending a current over the mainline wires to operate devices for preventing the closure of any other receiver-circuit on the line by persons at such receiver-stations,

substantially as set forth.

3. In a telephone system for party-lines, the combination with the main-line wires leading from a central oflice, of a series of telephone-receivers each independentl connected to the line-Wires by an open e ectriccircuit acircuit-closer includin a ma net and an armature at each receiver-station under the' control of a person thereat for closing the receiver-circuit at such station, a circuit-closer including a magnet and an armature at each receiver-station under the control of an operator at the'central oflice-for closing the receiver-circuits at the respective stations, and means for mechanically operating the first-named armature at a station when the second-named armature at the same station is electiically'operated for closing the receiver-circuit, substantially as set forth. 1 l

4. In a telephone system for party-lines, the combination with the main-line wires leading from a central ofiice, of a series .of telephone-receivers each independently connected to the line-wires by an open electric circuit, acircuit-closer including a magnet and an armature at each receiver-station under the control of a person thereat for closing the receiver-circuit at such station, a circuit-closer including a polarized magnet and an armature at each receiver-station under the control of an operator at the central ofiice for closing the receiver-circuits at' the respective stations, and means whereby the first-named magnet and armature may be operated to close the receiver-circuit without affectin the polarized armature, and

when the said polarized magnet and armature are operated to closejthe receiver-circuit the-first-named armature will be mechanically operated thereby to also close the re ceiv'erecircuit, substantially as set forth.

5. In a telephone system for party-lines, the combination with the main-line Wire's leading from a central ofiice, of a series of telephone-receivers each independently connected to the line-Wires by an open electric circuit, a circuit-closer including an electrically-operated armature at each station under the control of a person thereat for closing the receiver-circuit at such station, a circuitcloser includin a polarized magnet and armature at eac receiver-station under the control of'an operator at central for closing the receiver-circuits at the --respective stations, said armatures being carried by pivoted arms and the arms overlapping at adjacent ends, whereby when the polarized armature is electrically operated to close the receiver-circuit its arm will rock the arm of the other armature and cause the latter to as set forth.

6. In a telephone system for party-lines, the combination with the main-line Wires leading from a central office, of a series of telephone-receivers each independently connected to said wires by an open electric ciralso close the receiver-circuit, substantially cuit, means at each receiver-station ada ted to be electrically o erated by a current om the central office or'preventing the closure of the respective receiver-circuits, means at seams each receiver-station adapted to be electrically operated for closing the receiver-circuit at its own station only, and a single magnet and armature at each receiver-station for closing its own receiver-circuit and also closing a circuit at the central oflice over which said current may be sent to prevent the closure of the other receiver-circuits on the line by persons at such receiver-stations, substantially as set forth.

.7. .In a telephone system for party-lines, the combination with the main-line wires leading from a' central office, of a series of telephonereceiv ers each independently connected to said wires by an open electric cir cuit, a generator at veach receiver-station, a magnet at each station in the normal circuit of the generator and operating when ener-- g'ized by the generator to close the receivercircuit at its station and also to close a second circuit for the generator; and another magnet at each station operating when enerized. by a current from the central oflice to reak the normal circuit of the generator, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence'of two subscribing witnesses.

KOBY KOHN. Witnesses:

F. L. FREEMAN, GEORGIA P. KRAMER.

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