US969393A - Combined telephone and protective alarm system. - Google Patents

Description

I J. G. NOLEN. COMBINED TELEPHONE AND PROTECTIVE ALARM SYST APPLIQATIQ); FILED MAYB, 1907.

0 1 9 1 6 m S d w n m P J. G. NOLEN.

1 COMBINED TELEPHONE AND PROTEGTIVE ALARM SYSTEM.

. APPLICATION FILED MAY 9; 1907.

96 9,393; Patented Sept. 6, 1910.

2 SHEETS-SHEET 2.-

lia 677%?" J27i77ij 07%052973 4 5 UNITED STATES PATENT onrrcn.

JAMES G. NOLEEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOHN E.

CHICAGO, ILLINOIS.

SHEPHERD, or

COMBINED TELEPHONE AND PROTECTIVE ALARM SYSTEM.

Application filed May 9, 1907. Serial xiii: 315.74%. V

' To all whom it may concern:

Be it known that I, JAMES G. NoLnN, ,a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain newand useful Improvements in Combined Telephone and Protective Alarm Systems, of which the following-is a Specification. I

My invention relates to improvements in combined telephone and protective alarm systems of the general character disclosed and broadly claimed in my pending application Serial No. 302,838, filed February 26th, 1906..

One of the objects of my invention is to" provide an alarm system applicable to party lines. I

Another object of my invention is to pro vide a protective alarm system operable as an auxiliary to establish a telephone system without requiring any change whatever in the normal equipment, and by the simple addition of circuits and devices at the subscribers station.

Another object of my invention is to provide an arrangement .for party line protective alarm service, such that the protective alarm installation at any station may oper ate to signal the central operator even though the party lineis being used by some other subscriber thereon, and the conditions at the central station are those normal to a complete .talking connection between such party line and another line oircuitof the in conjunction with telephone systems, andother and further objects of my invention will become apparent to those skilled in the art from the following description, taken in conjunction with the accompanying drawings, wherein Figure 1 1s a diagrammatic View showing my burglar alarm system as applied to awell known telephone system. F 1g. 2 is a front elevation of a signal or alarm box, suitable in the practice of my invention. Fig. 3 is a side elevation thereof with part of the casing broken away. Fig. 4 is a detail of thesetting handle for such box, and; Fig. 5}-,=is a sectional detail on hne 55 of ig. 2.

Throughout the several views like char-- Specification of Letters Patent. :Patented g t. 6 1910 acters of reference refer always to like parts.

I -In Fig. 1-, I have-shown in diagram matic fashion as a telephone installation of well known character, a central energy cord clrcult, a private line and a party line.

Specifically Z and Zrepresent respectively the tip and sleeve line wires of a private l1ne L, connected at the subscribers station respectively with .the switch hook it and through a transmitter t with the upper switch hook contact. The private line is shown as embodyingthe bridged bell wiring arrangement, and, therefore, the lower switch hook contact is connected through a suitable condenser c and bell b with the line 'wire Z. The rest of the subscribers set is not shown but may be of any suitable character. At the central station the switchboard equipment of such-line is indicated as of usual type involving jack J, providing the tip and sleeve jack sprlngs j and j, connected with lines [and Z, respectively and test ring 7 connected to the usual line cut-01f relayv low, and thence to ground the line signal, indicatedas a lamp ls, connected in:

a circuit groundedat one end, and adapted to be connected-through the normally open armature of the line signal relay Zsr with I wires 79 and 72, have exactly similar central station arrangement, similarly indicated, but at the subscribers stations, whereof two are indicated as P and P, the ringing connections are alternately connected to opposite sides of the line and'are grounded. To.

. this end the switch hook of the station I 1s,

connected with the tip wire p,while,at station P the hook is connected with the sleeve wire 7/ the upper contact andtransmitter in each case being connected with the remaining line wire and the lower hook contact grounded through a suitable resistance and bell'b.

In the central cord circuit shown the central battery CB has connections onits positive side through the strand or wire 5c, on the one hand through normally closed contacts of the operators calling and listening key K with the tip of the calling plug cg), and on v ihe. ther hand withthe tip answerindg The key.

plug ap, and on its negative side is groun ed and also connected' by the sleeve 'strand y; on the "one hand throu h'the Supervisory re laysrcand the enna yjclo'sed Wntacts of the 'key- K to 'the sleeve of-thezcaliing plug c'ord 'circuit' 1's connected. with thelpositive central battery (3B,, and on oppoe ',-1ng generator RG and selectlve key connec zd yti n.

f 001W 1 'tlo'nal form; I V

. Itwill befunder stood-that reass gn-s v .Esy m-which;1 have thus; far da ned: is notlnew, and is illustratedsimply as onejsys- 2 2 i "-iently beapplied, for purposesof disclosure; J The ordinary jo era'tion's of a telephone sys-' I g tem'wi'll ne un erstood and need not here be tern-' to':- "which" my invention may conven described.

. cuits Ipro'vide a 'preteetivesystem yvholly' .local to a subscribers station, comprising a r 'rotective. circuit, including signal initiatmg protective devices, such as door-and win dow springs ofa' burglar alarm system,- or; 'thermostatiof a fire alarm system, or the like, which in their 'operationefiect' an asso-"- ciation of the telephone andprotective cirtion battery. circuit responsive instrument responsive to the operation of the signal initiat1ng means, 'arranged, when in operatlon, to cause the 1 cuit preferably such that the-protective c'ir-,

'CHltlS fed with current from the central: set

With the protectivecircuit is associated a operation of an' alarm ofproper character,

7 and proper association with the telephone 4 system, .forthe transmission to the central openators' set of an audible alarm. Further I 'sofarrange that the line signal at the -cen-- t-ral station,appropriate to the subscribers line"responds to the operations of the proe de'vices,jto attract the attention of entral station operator and I-further' so arrange the protective devlces that in the event that the'subscribers' line is already n use when thprotective devices operate, the

central operators'attention is called to the fact of such operation of'the. protective'de- .vices by the response of the supervisory signal to such operation. I further makesuch provision that-upon a party line the signal or alarm devices of each subscriber may serve to send to the central. operator a dlstinguishing signal, whereby the operator is supervi' l m an SK, wzdiagrammatically illustrated in high speed part "of t vibrati v With; this 'oixother suitable telephone cirteases enabled to whose, protective devices are operates; ;eat;

of the multiplicity of subscribers i, by the common l ne.- I ;:Connection suitable for...

this latterservice Iiwill first describe.

' For. cfli henience all bfft-he apparatus the subseri '19s. station. }"ex eept' the signal an mating evice for said circuit "connections may begincorporated yin. an. alarm box, of,"v the character shown-in Figsi 2 tot), wherein logfizndicates thebox frameand 1{1' th'e door, said box vhaving mounted therein a rela' 3,2,1 thefarmatlire 13' whereoi is providedwit an arm 14 governing the "of a;

spr n g lled inotor, 'which'yaetliates' the v ;-switching. me hanism! 15,-findi cate s infgen eral a. motor provided with;- a winding stem :16: andrhavingon one-ofits. slow. speed arbors 'a wheel 1-7,. provided with .an insulating rimf 18,.and a crown-flange 19,-

in'fwhich. is provided .af-notch"20,- arranged to receivej aroller' .2 1 by; the'armature arm -14, ,when-sald' armature is retractedfrom vthe relay magnet 12; On al lsuitable j e-inotor, c :ajSfthe.

e escapement member 22, p1=d-= Vidda pin23 with which coacts a. blade- 24 carried .by the arm 14,. the blade being arto release the'escaper'nent. part when :armature13 's attracted "to its 4 magnet and s0 gized-to attract the armature. 13 the wound motor is releasedandwheel 17 turns,- the .r.dnged' toistop and hold the against--.- 'fl'no'vement wheneverthe roller '21 entersnthe 9s notch2O of the crown fiang'eof wheel 17,; and

flong as' roller2lrides' upon the rim'of' the crown flange 19. "Thust will be apparent 'that whenever the relay magnet 12 is enerroller 21' ridingup the inclined edge of the notch 20 "on to Jihe rim of flange 19, so mechanof the vibratile member 23, and permitting the clock to run until the 'wheel has made, a complete not, but at t e end of such rotation if the revolution, irrespective of whether ma' et '12 remainsenerg zed or magnet has in-the meantime become de'e'ner'gized the roller '21 again drops intonotch 20 and the blade 24 stops the escapement' member 22 by engagement withthe pin 23;

'The wheel 17 carries a suitable number of teeth, or pins 25, arranged to coact with the extremity of a spring-pressed striker 26,-arranged' when moved .and released by a pin: 25 to. strike against and sound an audible alarm device 27, illustrated as a coiled sounding spring. The wheel 17 is preferably provided in the periphery, of its insulating rim, 18 with a notch 29, in which stands when the motor is at rest contact leaf 31 of a set of springs 80 including ale-at spring 32 with which leaf 31 normally'makes contact, and a leaf 33 into contact vwith.

which leaf31 may be raised; when the notch Y '29" passes-from beneath spring -31, the

. 10' ically-holding the ,blade24 out of the path riphery of the rim 18. Y The rim '18 may further be provided with notches 34 arranged -to wind the 'motor an angular distance corin order to represent a signal similar to that I represented by teeth 25.

The" casing door ,11 preferably carries the wind ng handle 35, adapted when the door is closed to'connect for rotation with the-windmg stem 16 of the'motor,"and {prefer that such winding handle also control the setting spring, whereby the protective devices may be cut into or out of service or operative condition. To this end I make the stem of the windinghandle in two parts coniieeted, for rotary lost motion, the main stem ng thereon a pin 37 engaging in an stem portion-'36 I provide an insulatingdisk 40 having in the periphery thereof a notch 41.,said disl 40a being operativelyi associated with a suitable set of contact springs, gen erally indicated at 42, and so {arranged that when one of said springs stand in notch 41 the protective service is rendered inoperative, or cut out, while when the handle 35 is rotated so that the normal periphery of 'disk40, raises the aforesaid spring, contacts are effected cutting the burglar alarm devices into service or operative condition.

It will be seen that by the arrangement shown inFig. 4 the handle 35 may be moved responding with the arc of slot 38, and that if'the handlebe left in such position the controlling spring of the set 42 will be elevated to cut the burglar alarm devices. into service, but through the lost motion connecand a thermostat respectively.

tion the handle 35 may be restored toinitial position, so that the controlling spring of theset 42 again drops'in notch 41 to put the alarm devices again out of service, notwithstanding that the motor has been wound. Thus the putting of the station into or out of service'is left wholly-to the subscriber, "and the movement of the handle to throw .5

the station into service necessarily winds the motor'if the same has previously run down.

It will be understood that I do not limit myself to'these particular devices, but show the same simply for purposes of full disclosure and for convenience of description of an operative system.

Referring now to the party line equipment, shown to the right in Fig. 1, mdlcates-the protective circuit, grounded at one end at "G', and including in parallel therein signal initiating devices 51 and 52, indicated as normally open window or door sprmgs, Such circuit 50further including the coils of the relay 12,

the normally closed contact springs 32 and station P two pairs of'springs electrically t 36 'directlyconnected with handle 35' ngated groove 38, in a sleeve stem part 39, carried by-the main stem part 36, and havmg at 1ts end the; aperture for engagementconditions when the party line P is not in with the w nding stem 16. Upon the main will be observed, includes the relay 12, the

of set 3Q,associatedfwith the motor, suit able-spr ngs of'the set '42, terminatin i-n'a connection with the switch hook-h which, it will be remembered, is connectedto 'th I side'of the line. The remaining sprmg ofthe switch set 30, is connected byi wire- 54' through springs of the set 42, with the u-pper contact of the switch hook h I In the arrangement of the springs 42, as

shown in connection with the subscribers disconnected are employed,- one pair of springs forming. part of the current path for" each of wires 50 and 54, said springs being so arranged that both pairs are closed when the box handle 35 is rotated to position to wind the motor and thereby condition the burglar service devices for operation.

7 liow it will be seen that under normal use, the operation of any of the signal initiating devices 51 or 52', at the station of the subscriber P closes a circuit as follows; from the grounded side of the central bat-. tery CB through said battery,- the relay Z87, the tip wire p, the switch hook wire, the lower springs of the set 42, springs 31 and 32 of set 30, the windings of relay 12, the closed signal initiator, and back to ground at G. This circuit including the line signal relay, energizes said relay, and, causes it to attract its armature thereby cutting in the line lamp in the ordinary malmer. In response to the line lamp signal the operator, of course, plugs in with the answering plug and bridges her set upon the cord strands a; and y. I

The ground circuit heretofore traced, it

armature 13 whereof is attracted, releasing the motor to permit the latter to effect a complete revolution of the signal wheel 17, which at the outset lifts pen 31 into contact with pen 33, breaking the ground circuit, heretofore described but closing the pen 31 1 upon the pen 33 and thereby establishing a I bridge across the line through the transmitter and wire 54 to the pen 33 and back to the switch hook through a suitable portion of the wire 50. Obviously under these condi- 1 tions, which are equivalent to those produced by theremoval of the receiver from the switch hook, so far as effect upon the line signal is concerned, ,the line lamp continues lighted until the operator plugs in, but the l grounded bell circuit {is not broken, as would be the case were the receiver removed from the switch hook. The rotation of the wheel 17 further produces movements of the striker 26 to strike the sounding spring 27 a number 1 of blows determined'upon, and constituting the signal for the particular subscriber on the party line.

It will be understood that in the installation of the apparatus this alarm IDQChHJbxl isni. i's

v p the transmitter *transmitter which placed within efiective distance of e transmitter, that is vto. say, so close to that the sound a of "the alarm may ,readily cause vibrations in the" quently. the central operator instead of get scrlbers station,

' 131011 is operated,

j tomary signaling operations through thev alarm devlces burglar 1 It will be observed that the conditions I ting a call in the ordinary manner-hears the .-predetermined blows" of th sounding spring of 'the audible alarm at the 7 sub-- and instantly knows {that} the. burglar alarm at such subscribers 'sta and thereupon the, central operator may, selectively orjotherwise, as the installation of the subscriber from whose station the alarm is received."

at'the subscri-bers station produced by the operations of the alamn.sys'tem-- heretoforedescrlbed, "do not wholly {prevent the cus subscribers bell, for the reason that" the;

grounded burglar -,alarm circuit wire- 50,

which if intact would short-circuit the bell, has been broken by nection remaining at. thesubscribers' station is that through thebell' In efi'ecting connection of the burglar to the subscribers set P, wherein the switch hook is connected to the sleeve side of' the, line, slight increase in the wiri'ng'must be made in order that the .85;

impulses transmitted --over the tip side of; the line may actuate-the relay 12, without encountering the resistance of the trans-1 Imitter. As shown in Fig. .l the wire including the signal initiating devices and the relay normally include springs 32 and '31, and

set 42, but is connected between the trans mitter and the front contacts, while the. wire 54 extending from spring 33 includes another pair of contacts of vthe set 42 and- .is connected to the switch hook so that while the connections of the burglar alarm set are, reversed with respect to the --in stru- I ments of the subscribersset at these two a -"the" line w1res, t-he1r' connectlons merely.

stations, they are-"similar with respect to compensating for the reversal of connec tions of the two subscribers sets with theline. To cut out the resistance of the trans-- mitter t, however 'a supplemental contact 32? is providedt'o contact with sprlng 31- simultaneously" with contact 32, such supplemental' contact" 32, being connected through Wire 54 and a third pair of springsofthe set 4L2 with the transm tter .een the transmitter and connections thetip line so that when the burglar .al'afrm is in service and one of the signal initiators is closed current from thegrounded central battery flows through the-tip are reproduced as sound- -waves by the operators receiver. Conserequires, ring the bell the separation of springs 31. and 32,'so that the only ground con-- the lower pair of; springs of the.

vices to grhund, avoiding the jresistance of the transmitter,

activity of the motor 'in response to operathe transmitter, part .orwire-'50 springs is -.connecteduthrough the strands a and y oi from the central battery t10ns,5 on the one hand scribe'r,-.'let usfassume the line L,-a'nd"'on the other hand through the calling plug of receiving lamps} 8a ..of, the shunts established therearound', while extinguished through the operation of the line cut-out'relay's law... Now if initiator at stationP be operated, acircult initiating device to ground, so establishing a ground'circuit' through the "tip side-only of the cord circuit, and thereby grounding out or robbing the calling end of the pervisory relay-81 c is substantially deener-. gized and its armature falls, giving current to the supervisory lamp so which starts to glow. The relay l2 beingproperly enerthereby. breakingthe ground circuit just devisory lamp to deenergized conditiom; The motor, however,may be wound to run'several revolutions ofthe wheel 17 and each time wheel 17f'reaches-such point that the l the supervisory'lamp, also causing the armature 13 to bei'attracted by its magnet, so that 'a new revolution of wheel l7'1s'begun.

number ofthe subscribers station, may be employed to permit'mom'entary operatlons lof the switch contacts to establish said 31 '33,. and back by". Wire 7110' the a I ,will now: describe the operation )of i in 'calling'eentralwhen' subscriber? battery current is being fed GB in both direc to the callingsubthe called subscriber .-;on the party lme" P; 'Both supervisory relays 3m and 876'316" current so that both supervisory and 8c are deenergized by reason both line lampsfof the lines L and P are" a signal is established from the-central battery CB- over the tip wire '3) through connection 56*" includingthe relay 12 and the closedsignal V gized, sets themotor in motion and wheel 17 7 begins" to revolve, raising the-pen 31 and pen 31 drops in the. notch 29,'t hegroundcircuit is restored, causlng another flash of side of theline 'that connects'with 54'? an 50 through the relaysignalninitiating' de;

-whilej-uponthelifting of spring 31, due, to the rcommencementl of 'tion-'of 'relay"12, thecircn'it pathf'is from the central batterythrough the wire I hook, and such line .the cord .clrcult wlth the'line of someother sleeve strand ofthe cord circuit, so that su- 'scribed, causing restoration of the .super- Furthermore, the'notches bi -Yin the "periphcry of the. wheel 17-si1nulat-1ng the slgnal grounded circuit, and thereby'cause the supervlsory lamp to flash signals corresponding with the station numbers-of the party whose alarm system is operated. Of course connections being already established through the cord, the central operator need but listen in to receive the audible signal from the alarm at the subscribers station,

which, it will appear, may be transmitted without material interference with any conversation that. may be going on between the subscribers initially connected for conversation. If the party line is equippedfor selective signaling the central operator may then in the usual way ring the party Whose alarm is operating,.orif necessary, may instruc't the conversing party on the same line to hang up temporarily in order that she may give the proper alarm. In brief, without disturbing in any way the ordinary telephone equipment at central station or at the subscribers station, but merely by the addition of devices mechanically and electrically simple, the burglar alarm apparatus is adapted for the transmissionbver a party line of signals distinguishing the station of the particular party whose line is-operating, and attracting the attention of the central operator irrespective of whether the party line is already in use by some, other subscriber or not, and, in the event that the line is already in use such alarm may be transmitted without seriously disturbing the party already using the line, or causing any disturbance of the established connections.

It will, of c'ourse, be apparent that the apparatus and circuits describedma-y equally well be employed upon an individual or single line. and upon suchline, if pre-' ferred, a bridging system both for ringing and for'alarm signal. transmission may be employed, as indicated to the left in Fig. 1. Furthermore, it is not essential, for some of the purposes of my invention that the ordinary tra jrisn"1itter be employed in the operation titthe .alarm system, for ajmeans for occasioning vibrations in the operators re-' ceiver may operate directly in the line to the exclusion of the transmitters. This specific feature of my invent-ion I do not here claim in detail, as such an arrangement is claimed in my co-pending application, Serial No. 376 481, filed May 31, 1907. In this arrangement the relay and motor may be substantially the same as heretofore described, the

audible alarm being done away with, and

wheel 17 coacting only with a group of contact springs, Specifically wheel 17 has a peripheral notch normally receiving the ower spring of a pair of insulated springs and6l insulated from each other and arranged to rise in unison when the notch of the Wheel passes froir beneath them, the lower spring 60 normally making contact with a spring 62, and arranged to be hfted to; contact with spring 63,. and the upper spring bemgarranged to normally contact with the spring 63 and to be lifted therefrom when raised. The signal initiating devices are connected in a circuit 50" includmg the relay 12, the signal initiating devices,

the springs 62, 60 and extending tov the" the battery. This .energized circuit includes the relay 12, which trips the wound motor so that its signal wheel 17 revolves, raising the associated pins 60 and 61 to establish new contacts, breaking shunt 66-67 around the buzzer, opening contacts 60-62 3116.00111- pleting a circuit from battery, through the ine w1re l to spring 60, through spring 63 by Wire 67 through the buzzer and back over line wire l, consequently When-the central operator plugs in in response to the line signal, she hears in her receiver the buzzer 65 working in the line, and is thereby apprized of the operation of the signal initiating devices of the burglar alarm circuit. It will be understood, of course, that this buzzer arrangement is equally applicable to the grounded protective circuit and rmgmg system as it is to the bridge protective circuit and ringing system, and may be employed in a party line with the motor wheel having its periphery notched at intervals to permit return of the pens to normal posltlon at determined intervals,-each such return reestablishing the short circuit around the buzzer 65 and thereby causes the buzzer to opcrate intermittent y in a fashion which may be read as number signals, or the l1ke. It

will further be understood that the bridging system shown to the left in Fig. 1, is not well adapted to party line practlce, as such use involves complications of Wiring or balancing of resistance, which are avoided by the use of the grounded signal initiating system.

7 While I have herein described in some detail a specific embodiment of my inventlon for purposes of clearly lndicatmg to those skilled in the art 'a convenient and practical arrangement, it will be understood that changes ma be made without departure from the spirit and scope of my inventlon,

"the single modification described being here presented merely as suggestive of the widely variant forms in which my invention may be I practiced.

- system, the combination 015 the central'sta Having thus described my inventnm, what I claim and desire to secure by Letters."

Patent, of the United States, is:

1. In a comblned telephone and protective 'tion equipment involving a normally de-' energized line signal and an operators "set including a receiver, a subscribers'line in.

v volving at the; subscribers stationa trans-- mltter. and ,a-switch normally opening the circuit of saidtransmitt'er, a subscribers protective circuit, signal-initiating means,

motor actuated alarm means controlled by said'protective-circuit arranged to occasion an audible alarm, andmotor operated means for closing the transmltter clrcu t to include therein the transmitter during the operation of the audible alarm means."

- 2. In a combined telephone and protective alarm system,'the combinationof the central station equipment involving a normally. ,deenergized line signal and an operators set including a receiver, a subscribers line in 'volving at. the subscribers station a trans mitte'r and a switch normally opening the "circuit .for said transmitter, a subscribers transmitter .to transmit. sound protective circuit, signal initiating .means therein arranged when actuated. to complete a circuit for energizing the-central line signal, motor driven audible alarm means within ef'fective distance of the thereto, motor controlling means therefor responshe to the "actuation of the signal initiating means'to' 'start the motor, and means eluding-a receiver, a s'ubscrib'ers line involving at the subscribers station a transmitter, a protective circuit, signal initiating 'means therein, alarm means, adapted and arranged to occasion'in the line vibrations operated by said motor for bridging the nor mally open switch connection of the trans 'mi-tter'to include the transmitter 1n operative association with the line. 1 I

3'. In a combined telephone and burglar falarm system,the combinationof a central station equipmenhdnvolving a normally deenergized line signal, an operators set intranslatable into audible-soundby the -o er- 4., In a combined --telepho'ne and protective system, a central station equipment includ- 60. with asubscribers'llne, a supervisory signal ing a battery,- a cord circult for connection ar-ranged to be" energized by the grounding of a subscribers line whenthecord circuit 'is--connected therewith, and an operators set includinga'receiver, a subscribers line seats:

involving atthe sub'scribers station a trans,, 'mitter and-a switch normall opening the transmitter circuit, and a subs ribefis protective system involving s1 al inltlating meansarranged when-operate to cause the ground- '7 ing of the subscri-bers line by a] circuit exclud- 1 ing the transmitter, and autiibl'e signal devices within effective distanc ,m1tter responsive to the operation-'of-tlie of the transsignal initiating means to occasion an audible 5" signal and to close an operative "circuit invol-ving-the transmitter there to condition the transmitterto transmit t e audible signal to the central station receiver.

a 5. In a combined telephone-and protective 30 system, a'partylin'e, a central station equip -ment .comprising'an 'operators receiver, a

line signal-and a grounded battery therefor, at each, subscribers station in said party normally open ground circuit'adapted when closed to energize the line signal, a relay in said ground circuit, a motor controlled by said relay, and means for transmittingian audiblesignal characteristicof the particularstation controlled by said motor, means for closing the transmitte'rcircuit to energize the transmitter controlled also by said motor, and signal initiating means for clos-' ingthe normally open ground circuit.

' 6. Ina combined telephone and protective system, 'a party line, a central station equip- :ment'comprising a line signal, a grounded battery therefor, an operators set includingv 160 .a receiverfand ringing devices, and at each subscribers. station in said party line a transmitter, a grounded bell,'and a protective system involving signal initiating dcvics, a ground circuit connect on closable' by the operation-of said signal initiating device, the initiating devices for energizing the line signal, and means controlled by the closure olfut'saidncircuit' for. breaking said .-,circuit and for transmitting to the central station through the subscribers transmitter an alarm characteristic of the particular station, whereby after the line signal is actuated the subscribersfbell maybe rung from the centralystation through the normal ground connection.v

'Z. In a combined telephone {and protective system, a party line, a central station equipment comprising a line" signal, an

operators set anda means of current supply, and at each subscribers. station'insaid line, a transmitter,.a grounded bell "and a protective system involving signal initiat ing devices,[an alarm signalingdevice, and

means whereby the actuation of said signal initiatingdevices "establishes acircuit for the central: line. signal, and conditions the 'alarm' signaling means for operation to transmit an audible signal through the transmitter.-

line a transmitter, a normally. open circuit 85,

therefor, a: protective system involving a 8. a combined telephone and protective system, a central station equipment comprising a line signal, a grounded battery therefor, a party line, and at each subscribers station in said line a groundedbell normally connected with the line, a tmnsmitter normally disconnected from the line, and a protective system involving'signal'initiating devices, va ground circuit connection closable. by the operation of said devices for energizing the line si ,al, an electro res'pon--. sive device, an audib e operatively related to the transmitter, and controlled by said motor, and means. for closingthe normally openlransmitter circuit also controlled ranged to be actuated ,cotemporaneonsly with the operation of thesoundin'g' mechni m. a l 9. In a combined telephone and p'rotecsounding mechanism by said motor, and. ar-

'tive system, a telephone system involving at each'subscribers station a transmitter and a normally open transmitter circuit there-- for, a motor driven signaling device com- Y prising. a switch, said switch whereby the latter may the line or close the subscribers transmitter circuit, said motor device having a sounding ,mechanlsmw'ithm efiective distance; of the transmitter and a winding handle, a switch for disabling the motor-o erat'ed switch controlled by' the winding handle, and signal initiating means controlling the operation of the motor.

-In testimony whereof I hereunto set my hand in the presence of two, witnesses.-

. JAMES G. NOLEN. In the presence of' Fonrin BAIN,

MARY F.

circuit connections for:

25. ground

Images