US559874A - taylor - Google Patents

Description

(Hommel.) s sheets-sheet 24 W. P. TAYLOR.

TELEPHONE SYSTEM. NoE 559,874. 'Patented May 12, 1896.

(No Model.) 3 SheetsSheet 3.

W. F. TAYLOR.

TELEPHONE SYSTEM. No. 559,874, Patented May 12, 1896.

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WALTER l". TAYLOR, OF MONTREAL, CANADA, ASSIGNOR OF ONE-HALF "O LOUIS M. PINOLET, OF SAME PLACE.

TELEPHON E SYSTEM.

SPECIFICATION forming part of Letters Patent No. 559,874, dated May 12, 1896.

Application filed August S. 1894:. Serial No. 519,393. YN@ model.)

To uit whom, t may concern: ln the drawings, l, 2, 3, Ll, and 5 are keys Be it known that l, WALTER F. TAYLOR, a having square shafts, which slide in guides subject of the Queen of Great Britain, residb b', connected by the side pieces li, the ing at Montreal, in the Province of Quebec, shafts, the guides, and the frame being made 5 5 3 Dominion of Canada, have invented certain of an electrical conductor, such as a metal. new and useful Improvements in Telephone Pins C in the shafts by their action on the Systems, of which the following is a specifiguide Y) prevent the shafts from being pulled cation. out of their places in the guides and also My invention relates to improvements in limit the distance which the keys can move 6o io telephone systems composed of more than out-ward. Spiral springs C'around the shafts two telephone instruments provided with terbear against the pins C and the guide b' and minals, each electrically connected with one by their tension tend to keep the keys in of the other instruments. A person at one their normal position with the pins in contact of the instruments can communicate with with the guide l). 65 i5 another person at any of the other instru- D D2 D3 D4 D5 are spring-terminals resting ments without the intervention of a centralnormally against a bar (l of insulating matestation operator by elosin g a circuit through rial, which is located between the ends of the the terminal on his instrument, which is elecshafts and the springs, so as to keep the trically connected with the otherinstrument; springs in alinement and out of contact with 7o 2o The object of my invention is to provide a the rends. of the shafts. One of the springsimple and convenient device for closing the terminals is located in the path of each key, circuit through the terminals, which device is D being in the path of key l, D2 in the path automatically reset when the conversation is of key?, and so on. A bar-terminalE, of con finished and the telephone-receivers hung ducting material, crosses the paths of the 7 5 2 5 upon their hooks. spring-terminals D, being separated from the Referring to the drawings, which form a terminals by a short space, so that when one part of this specification, Figure lis a top of the keys which has been pushed in far view of the device. Fig. 2 is a front view ol enough to cause the end of its shaft to make the same. Fig. 3 is a section of the telephonecontact with the opposite spring-terminal is 8o 3o hook, showing the details of the pawl. Fig. pushed in farther to any predetermined dis- -i is a section of Fig. 2 on the line X, looking tance the said spring-terminal will be brought toward the tripdcver. Fig. 5 is a view of into contact with the bar-terminal. F F are Fig. el, showingthe spring-terminalpressed in notches near the ends of the shafts and in contact with the bar-terminal by the key. the upper sides thereof, the portions of the S5 35 Fig. C is a view of Fig. l, showing the catch shafts beyond the notches being tapered to engaged with the notch in the key. Figs. '7 a point. v and 8 are diagrams of the electrical circuits G is a catch, both ends of one side being of a system with three telephone instruments. pivoted to the side pieces B. The other side, In Fig. 7 instrument No. l is represented as which' is free, rests normally by its weight oo 4o calling up instrument No. 2, and Fig. S repupon the tapering ends of the shafts a, be-` resents the same instruments when afteryond the notches F, so that its edge is lower' ward communicating together. than the edges of the notches. Nhen one The drawings represent the invention as of the keys is pushed in a predetermined disapplied to a telephone system suitable for tance, the catch will engage with its notch 95 45 use in stores, factories, and other similar and prevent the spring C from returning the places, in which system one battery serves key to its normal position. rl`he catches and cach telephone instrument to ring the bell of the notches must be so located relatively to another instrument to call up the person one another that when a key is pushed in far there; but those versed in the art could easily enough for the catch to engage with its notch 10o 5o apply the device to other systems from the the end of its shaft is in contact with the opinstructions herein contained. posite spring-terminal, but the spring-tervend of the hook.

The upper arm is provided with a retractile spring j, which is so adj usted as to elevate the outer end of the hook when the receiver is removed, and Awhen the receiver is replaced on the heel; its weight overcomes the tension of the spring and de#y presses the outerend of the hook.

the path of the shoulder yon the pawl.

l l A pawl; K, having a shoulder 7c, is pivoted to the outer On the hook is a'pin 7:. ini,

spring L, attached tothe hook, bears against the pawl, so as to keep its shoulder normally in contact with the pin and keep the pawl in a vertical position. 'armll of the lever are so located relatively to one another that the projection on the arm l is in the 'path of the pawl.

The'pawl and the upper The lower side i of the pawl slants so that its slope corresponds with that oi? the end of the upper arm Il.` When the outer end of the telephone-hook is:` depressed, the lower end of the pawl is belowf the upper-'end of the arm Il.

On removing the telephone-receiver from.y the hoolrV the hook'is elevated andthe pawl in passing the projection t' engages yieldinglytherewith, for the pressure between the pawly and the projection is against the sprin g,which 'yields and allows the pawl to pass the projection without moving the lever. lVhen the hook is depressed by the replacing of the receiver, the pawl engages unyieldingly with` the projection and pushes upper arm of the lever to one side, for the pressure between the projection and the pawl is against the pin 7c', which prevents the pawl from moving by its action ,on the shoulder 7c. This movement causesv t-helever to turn on its pivot and raises the lower arm, which in turn raises the free side of the catch G above the edges of the notches F. Thus any key whose notch was engaged with the catch is released and is returned toits normal position by the spring O".

Theelectrical circuits are as follows, referring particularlyto Figs. f7 and 8: l and 2 are two telephone instruments. As the apparatus at each telephone instrument is a duplicate of that at the other instruments, but two lare shown for simplicity. In each of the instruments, l is a telephone-transmitter, m is an induction-,coil having the terminals m' miete its secondary coil, n is a local battery, and'p is a selfLinterruptinig electro-magnetic bell, which serves as an electric call for the instrument. It is `immaterial whether a single receiver be used for speaking and hearing or a regular telephone instrument comprising a transmitter, a receiver, and an electric call; but as the latter arrangement is usually the best the device or invention is represented as applied to a system containing such telephone instruments.

T R S S? S3 are electrical conductors, of which T serves `as a return-conductor for all the telephones of the system. Branch electrical conductors lead from the main conductors to the telephone instruments. Provision is made by conductor S3 for connection with a third instrument, which is not represented for thereason above stated. t is an electric generator or battery,"one pole of which is connected electrically with the bar-terminals E in each instrument and the other pole with the return-conductor T.

One terminal of the electric call in each instrument is connected with the return-corr ductor T, and the other terminal is connected electrically with the contact q, with which the telephone-hook makes contact when the hook is depressed by reason lof the telephone-receiverbeing thereon. The telephone-hook in each instrument is connected electrically with the particular wire for that instrument. For

example, the hook in instrument l is connected withconductor S', the hook in instrument 2 is similarly connected with conductor Si, and so on. Y

One terminal of the telephone-receiver in each instrument is connected electrically with the return-conductor T, and the other terminal is connected with the terminal m2 of the secondary coil. The terminal'm of the secondary is connected electrically with the guides Z1 b' and in this way with the keys, which are thus in circuit with their respective telephone instrument. The terminal m' of the secondary is also connected with the contact r. y

The primary of the induction-coil m, the transmitter l, and the local battery a are included in a local circuit having two contacts r vr'. This circuit is normally open at the contacts; but when the telephone-hook is elevated by the removal of the receiver the two contacts are electrically connected bythe hook and the circuit is closed. One oi' the spring-terminals in each instrument is connected with a particular conductor. For example, all the terminals D are connected with conductor S and thus with instrument l, the terminals D2 are connected with conductor S2 and thus with instrument 2, and so on, the other terminals being connected with a particular instrument. There is no springterminal in instrument l connected with conductor S, nor in any of the other instruments is there a spring-terminal connected with the conductor for that particular instrument, for such a terminal would be useless, as it is obvious no one would desire to call up his own instrument.

The operation of communicating between two instruments is as follows: Suppose, for example, a person at instrument No. l wishes IOO IIO

to speak with some one at instrument 2. presses in as far as it will go key 2 on his instrument. The shaft of this key presses the spring-terminal D2 against the bar-terminalE and thus establishes a current through the electric call p in instrument 2. The current causes the bell to ring and notifies the person there that some one desires to speak with him. The current which has been established has the following course: from the positive pole of the battery t along conductor R to the terminal barv E, through the spring-terminal D2, conductor S2, to and through the electric call thence back to the negative pole of the battery by the conductor T. On removing pressure from the key 2 thel spiral spring C' moves the end of the key-shaft away from the terminal bar E till the further movement of the key is stopped by the engagement of the catch G with the notch F in the key-shaft. The above-described circuit through the electric call is thus opened and the bell stops ringing; but the spring terminal still remains in contact with the end of the keyshait.

lVhen the persons at both instruments remove the receivers from the telephone-hooks J, the hooks are raised by the springs j and move oit the contacts q and onto the contacts r and r'. This opens the circuits through the electric calls and closes the local transmitter circuit, and also connects the terminal m of Jthe secondary with the telephone-hook. A circuit for talking between instruments l and 2 is thus established, as follows: starting from m of the secondary coil of instrument l, ihrou gh the guides b h', key 2, sprin g-terminal D2, conductor S2, telephone-hook J, contact fr, to and through. the secondary coil of instrument 2, thence through .its telephone-receiver O to the return-conductor T, through the receiver O in instrument l, and thence to the other terminal m2 of the secondary coil in instrument l, from which the circuit was iirst traced. When the conversation is iinished and the receivers are hung upon their hooks, the conscqu ent depression of thehooks causes the pawl on each hook to turn the triplever and thus raises the lower end H of the lever. The lower end of the lever in turn lifts the catch G out of the notch in the key 2 with which it had been engaged. The key is thus released and returned to its normal position by the action ot the spiral spring C'. At the same time the spring-terminal D2 resumes its normal position against the insulating-bar CZ and out of Contact with the key. The depression of thc telephone-hook also opens the circuits through the contacts r r and'restablishes the circuit through the electric call.

I claim as my invention l. A telephone system comprising telephone instruments included in circuits between a retiun-coiuluctor and a set of spring-terminals, each instrument being connected to a separate spring-terminal; a generator of electricity, one pole of which is connected with the return-conductor and the other pole with a bar-terminal in open-cirrcuitV relation with the set of spring-terminals; and a telephone instrument included in a circuit between the return-conductor and a set of normally open circuit-closing keys, having a separate key for each spring-terminal of the set, the springterminals being so located that a key when moved from its normal position closes successively the circuits between the said key and a spring-terminal of the set and between the said spring-termin al and the bar-terminal which is connected with the generator of electricity, and electric calls in circuits which are normally open between the bar-terminals and the spring-terminals.

2. In a telephone system, the combination of movable keys provided with springs whose tension keeps them in their normal position; spring-terminals, one located in the path of each key which is normally out of contact with the said terminal; a bar-terminal crossing the paths of the spring-terminals; a catch which engages with the keys when they are in contact with the spring-terminals and the spring-ter1ninals are not in contact with the bar-terminal; means for disengaging the catch from the keys; a telephone instrument in circuit with the keys and a returncon ductor; other telephone instruments in circuit with the return-conductor and the springterminals, each instrument being connected to one of the terminals; and an electric generator, one pole of which is connected electrically with the return-conductor and the other pole with the bar-terminal, and electric calls in circuits which are normally open between the bar-terminal and the spring-terminals.

3. In a telephone system, the combination of movable keys provided with springs whose tension keeps them in their normal position; spring-terminals, one located in the path of each key which is normally out of contact with the said terminal; a banterminal crossing the paths of the spring-terminals; a catch which engages with the keys when they are in contact with the spring-terminals and thel spring-terminals are not in contact with the bar-terminals; a lever connected with a telephone-hook and adapted to disengage the catch from the keys when the hook is depressed; a telephone instrument in circuit with the keys and a return-conductor whose telephone-hook operates the lever for disen gaging the said catch from the said keys; other telephone instruments in circuit with the return-conductor and the spring-terminals, each instrument being connected to one of the terminals and an electric generator, one pole of which is connected electrically with the return-conductor and the other pole with the bar-terminal, and electric calls in circuits which are normally open between the bar-terminal and the spring-terminals.

4. In a telephone system7 the combina-tion IOO IIO

of telephone instruments, included in circuits telephone `instrument yincluded l:in theici'rcuit vwith springs which tend to keepthem intheir 'normal positions -and having Aa separate key "the said- Sprin g-termilial and `the bar-terminal of [movablc'keys provided with springswhose? lbetween a return #conductor and a set of spring-terminals, each instrument being connected to a separatespring-terminal; :a generator'of electricity, one pole of lwhich is connected with the return -conductor Aand the other pole with a 'bar-terminalin open-circuit relation with the set of spring-terminals; a

between the :return-conductor and a Aset v'of normally open circuit-'closing keys provided for each spring-'terminal of -theset, the springterminals being-so located 'that -a key when moved from its normal position :closes -successively the circuits between the said key and a spring-te'rminalof the set and between Whichis connecte'dwith-thev generator of-electricity; and "a catch yadapted Ato engage'with, andjretain any -key which is ymoved into the position lin which it closes l`tlie'circuitbetween i itself and a spring-terminal `rof the fset, electric calls in circuits which are normally? openbetweenithefbar-termin'aland the springterminals.

5. In atelephone system the=combination 'of Etelephone instruments included Vin circuitg between a return-conductor and a set of; spring-terminals, eachinstrument ibeingf connected to-a separate'spring-terminal; a genv lcrater-of electricity, one'pole-ofwhichisfcon- 'nected with the return -fconductor and Ithe otherpole with'a-bar-termina'l in open-circuit@ relation with -the set of spring-terminals; ai telephone `instrument Iincluded 1in -a circuiti between the return-'conductor and asetoty normally open circuit-closing keysprovided with springs which tend to keep them in their.

sively the circuits'betwee'n the said key and a spring-terminal-of the set-and betweenthe said spring-terminal land the 'bar-'terminal which is connected with the generator of electricity; 'a catch adapted to engage with and retain 'any'key that is movedinto theposition in which it lcloses the circuitfbetweenitself and a spring-terminalof the set; andmean's for automatically disengagin'g -the catchffroml the lkeys after a conversation isiinis'hedfcon-iy sisting of a movable hook and a lever whereby the movement*ofthe-hook when the receiverof Athe telephone -in circuit'with the keysli's placed thereon `moves vthe catch-out ofen-i 'gagement with the keys, and electric call'sin;

circuits which are normally open between the bar-terminalfand the spring-terminals. 6. In a telephone system, the combination tension keeps them fin their normalposition ;i

jterminals, lone -'located in the patho'ffeach keys when theylare moved vinto contact with the terminals; iafpivoted leveradapted-to disengage the catch ffrom the keys when caused to turnen its pivot; a 'telephone Linstrument having a pawl on its hook which, when the hook is depressed, engages -unyieldi-ngly with 'the lever 1and causes it to turn and when the hook iselevated engages yieldinglytherewith, the said 'instrument bein g in :circuit with the keysfanda return-conductor; and other telcphone instrumentslineircuitwith the returnconductor and the'terrninals, each instrument beingconnected to 'fone of jthe terminals.

l7. [n a telephone system, the combination ofls'liding keys, provided with springs lwhose -tension Ykeeps them 2in their normal position land having shafts with notchestherein, the shafts f'beyondfthe notches being tapered; ter- 1minals,eac'h in circuit with a separate 4telephoneiins'trument and located in xthe vpat-h of 'oneof the keys which is normally outof contact with the said terminal; -a pivoted catch whose ffree -side Irests normally upon the tapered parts-of fthe -shafts,`but which engages with the notches when the keys are moved so lthat the 'shafts are Sin contactiwiththe terminals; a pivoted lever f-having an upper anda Ilower arm; the lower arm being under the free side o'ff'the catch and the upper arm 'bein g provided with-a projection; and a telephone instrument having a telephone-hook with a fpawl thereon which, when the hook vis de- 1'pressedfengages unyieldingly with the projectionandpushesftheupper arm of the'lever Ato one iside and, when lthe'hookis elevated, `engages `yieldingly therewith.

58. iIna-telephone system, -the combination of 'movable keys; spring-terminals, one located in thelpa'th of 'each keyand normally in 'open-circuit relation therewith; means for keeping Athe spring-terminals in alinement consisting Vof an insulating-bar located betweenfthekeys andthe said terminals; a telc- `phone instrument lincluded in a circuit between-'the'keys anda return-conductor; and other telephone instruments included in-cirlcuits betweenthereturn-conductor and the -spring-terminals, `each telephone being connected-to a separateterminal.

9. In atelep'hone system,the combination of movable keys; spring-terminals, one located-in the path of=each key; abar-terminal lorossing the 'paths ofthe spring-terminals; a `telephone instrument inl circuit with-the keys and-a'return-conductor; other telephone instruments in circuit with the-return-conduc- 'tor and the spring-terminals, each instrument being connected to one of the'terminals 'and-having' an electric call in its circuit; and an electric generator, lone-pole of which is 5 electrically connected with the return-conductor and the other pole with the bar-terminal.

10. lIn a telephone system of any number "of stations and having an electric call an'd telephone at each station, electric generators `for the electric circuits ofthe calls and teleroo IOS

phones, swing-terminals at each station, and a bar-terminal in the path of the spring-ten minals for closing the circuits of the electric calls, when the springs are brought in contact with the bar, and key-terminals movable to and from the spring-terminals, the said keys and springs being in circuit with the telephones, and circuitclosers governed by the telephones for opening and closing the circuits thereof.

1l. In a telephone System of several stations, a switchboard at each station both for calling another station and effecting telephonie communication therewith, consisting,` of terminals movable to and fro, spring-ter-

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