US1439761A - Signal and alarm system - Google Patents

Description

Dec. 26, 1922. 1,439,761

C. J. ROHLAND ET AL. SIGNAL AND ALARM SYSTEM. ORIGINAL FILED FEB. 5, 1915, 4 SHEETS'SHEET I Inventor's:- wzinesaes Q ;3 h Za byg w O W. 2n. Q w/wo I Attorneys.

Dec. 26, 1922. 1,439,761

\ C. J, ROHLAND ET AL.

' SIGNAL AND ALARM SYSTEM.

ORIGINAL FILED FEB, 5v I9I5, 4 SHEETSSHEET 2 enters:- wzzfness es C. $7 5 01? 822175 J 12 WeeJacvr 376M. by

Dec. 26, 1922. 1,439,761 v c. J, ROHLAND ET AL.

SIGNAL AND ALARM SYSTEM.

ORIGINAL FILED FEB. 5. 1915. 4 SHEETS'SHEET 3 F "J K K 22 4-2 Ga:

7a 45 H 51 5a O 72 668$ cififieeioc/r. 4 iv jwQ. v Arney.

Dec. 26, 1922.

C. J, ROHLAND ET AL. SIGNAL AND ALARM SYSTEM. omcmm. FiLED FEB. 5/1915, 4 SHEETS-SHEET 4 eelocfx Inventors:- capo/2 Arneys.

III I Patented Dec. 1922.

UNWED S TIATES cunr 1. nonnannpor'wononsrna,'ivrassaonnsnr'raann 30min. wnnnnocn, or r rrrzwIL IAa -nnw HAMPSHIRE, ASSIGNORS, BY Milena assremvrnnrs, T0 JOHN" H. WHEELOGK, or woacnsrna, MASSACHUSETTS. I

' J-if srenannnnnnnnn sYsTEMi Application and February 5, ,1915, seiau No. 6,349. Renewed. A :rii's0, i9 2 1;' Serial na'iaaear.

To aZZ whom it may concern:

Be it known that we, GURCL, J; Roi-ILANn tively, of the German Empire and of the United States, residing at l vorcester," in the county of \Vorcester. and State ofMassachus etts, and Fitzwilliam, in the county of Cheshire and State of New Hampshire, re-

spectively, have invented anew and useful Signal and Alarm System, of which the following is a specific'at1on'.,

This invention relates to a signal and alarm system, particularly suitable for fire alarms, but capable of other uses. The

principal objects thereof are to provide a simple vand compact arrangement so that all the mechanism requlred forgiving several different alarms can be arranged with in a small space; to provide means whereby when a call box or" thermo-switch or the or the like a trouble signal, "audible or vis ible, will be operated constantly so that the operator or any other person" at the central station. cannot possibly overlook the tact that the system has been rendered active and has not been fully restored to its norliltll'COIlClltiOll. Another feature of themvention is the arrangementfof these parts in'sucha way that-if alter aflsignal is dis-' played and while the same is 'being'sounded, another branch of the system is rendered active, this will not interfere with the 0peration of'the first signal and its alarm, but will simply cause a second signal to be, displayed at the annunciator. The invention also involves impro-vements in theconstruction and arrangement, as wellhas the :combination, of the parts.

I In carrying out the principles set forth herein'anintermittent current conveyoris employed preferably of the nature at that represented in the Patents Nos. 1,178,431

and 2 patented April 4, 19l6,'-and"thermoswitches may also beemployed'which may be of any desired kind.

Reference is to be had to 'theaccompanyingdrawings, in which-- i Fig. 1 is'a'dia'gram of a system constructed in accordance with this invention showing the wiring;

Fig. 2 is affront elevation of the device, partly in section;

"Fig; 3 is a sectional view on the line ,Fig. 4 :is' an end elevation of the drop signal mechanism;

F g; 5 is a plan of a portion of the same" showing the trouble circuit controlling mechanism; r i 1 -F1g. 6 is a front elevation ofthe clock work controlling device, and I 7 is an, end vlewshowing in elevat on the contacting magnet for. the alarm and connected partsw The drawings show the invention as used wlth a closed circuit whlch lsprete'rable,

closed circuit arrangement. I

but the invention is "'notplimitedtto the Referring first to the diagrammatic View,

1 it will be seen" that the mains A; are

connected by a double-acting switch B with either one or two storage battery circuits G and 1C, one being the operating'circuit and the other the, emergency one, usually required. Connected directly withone of: the

mains are a phiu'ality ofthermwswitches'D, the deta ls oi which are not shown herein. "Theyloperateto open or closea circuit upon the melting of a J fusible ,metal member. These can be arranged in series or multiple or both, and the latter system isshown herein; A plurality of call boxes are also shownwhich can be arranged in any desired They are shown each as being connected in series with a seriesof thermo-switches D.

Each of the branch. circuits inwhieli some of these thGIIDO'SWItClIGS and a call boxare located is connected in series with an electro-magnet F and these magnets are 0011- nected in multiple with each other and back tothe line. Each magnet when excited'holds up a steel armature'G which in turn holds a "selectornrn 4-6 up in inoperative position.-

Each of these armatures'is provided with line through a second alarm stop magnet -tures and magnets.

N inseries.

In this figure annunciator or selector contacts are shown diagrammatically at H and numbered 1 to 8 inclusive. The branch circuits are periodically connected by the operation of the clock work with one side of the line as will appear hereinafter. The other side of the line is connected through an electro-magnet P with the first one of the annunciator contacts H to be operated when the device is put into operation. This magnet when excited closes the alarm circuit Q, in which are alarm devices R.

Referring now more specifically to the selector mechanism shown inFigs'. 2, 3 and 4,.it' will be seen that the branch circuit numbered 1 in the diagram. is constantly connected with the disc 17 also numbered 1, with a shaft 41 and with the magnet P.

' Tn stationary position around this shaft ll and capable of oscillating slightly about the shaft as a center. Each disc 423d pro- 'vided with insulating surfaces 4-5 arranged in a circle but differently spaced so as to provide for preventing different ones of the plungers 42' contacting with their respective discs. Each disc has a radial arm 16 to the bottom of each of which is pivoted one of the steel armatures G. Springs tT individually connected with them tend to swing all ofthese arms down. These arms, however, are normally held up by the arma- Each arm is provided with a projection 48 and these projections are normally free to drop in slots 49 in a N'is deenergized and one of the armatures G dropped, this plate is moved by the spring G-tinto the position shown in Fig. 2 so as to hold up the ends of those arms that have betweenpairs of the plungers 422 and keeps others of these plungers insulated. In other words this sets the selector to control the giv ng of an alarm. In the position shown in the drawings, the armature G having a signal #23 has dropped, the'rest of the arms being held up by their arinatures G in the position shown in 3, and also illustrated in dotted lines in Fig. t. It is obvious that the parts will remain iii-this condition as long as this branch circuit is broken anywhere, and consequently during this period if one ofthe other branch circuits is broken that armature G- is also free to drop, and does so. v But this simply displays the second signal without operating the alarm be cause the corresponding arm is held up by the lockingplate. Y The only way in which an armature that has dropped or the arm thereof can berestored .is by lifting it by hand. and it will not stay up unless that branch circuit has been restored,

The device as shown herein is arranged to work on a closed circuit and when one of the thermo-switches D is rendered active by the melting of the fusible material whicl ordinarily makes the circuit through it or when any one of the call-boxes E is operated, that particular branch circuit through its magnet F is interrupted and that ail-mature G which that magnet normally holds up when excited is permitted to drop. The series circuit through contacts and 56 is also interrupted by the fall of this armature.

The clock work I provided with a magnet Y which is normally excited and holds itsarmature up to it, as shown in Fig. 6. This'also holds the wheel 5. and consequently the clock. work, from rotating in normal condition. Now when the circuit is broken by the fall of one of the arms -16 this magnet is ile-eneihgizeil and its armature left free. A Spring 58 in Fig. (3 then forces back an insulating plunger 59 and movesthe armature back, swinging it on its pivotso as .to allow the clock work to start. See dotted lines. Fig. 6.

Although the mechanism shown at the bottom of Figs. 2 and 3 and in Fig. 7 is illustrated and described in the first of the above mentioned patents, and thereforehas not been described in detail herein, we'slisll describe the operation substantially in thelanguage used in that application z-Upon the turning of the shaft 14; by the clock work. one finger will come into contact with the tooth 18 the corresponding disc 17. anda little later the. finger 29 will ride up on the corresponding tooth 20. No current with its finger 23,. a branch circuit will be completed through two plungers 42 in the will flow however until the circuit is closed at the terminals 33 and 34 by the action of the finger 29. The current will be established from the line through contacts 333et, arms 32, shunt 4&0, brackets 15, shaftl-l, one of the discs 17 the finger 23 that has come into contact with its tooth 18,- selector'oiannunciator contacts 42, magnet P- and the lineA. It is to be observed that the finger 29 makes it contactiwhile no current is flowing and the same is true of the several fingers 23. Consequently, no arc is made at these fingers upon theclosing of the circuit and the usual difliculties due to'the arcing at these points are entirely avoided. Moreover, the current is brokenat the terminals 33 and 34 .while a finger 23 is still incontact with its tooth so that the arcing there is entirely avoided. Arcing at this time between the finger 29 and tooth 20 is prevented by the shunt'40. This completes the circuit through the magnet P. and draws the armature thereof up to the magnet and closes the circuit Q so as of the alarm.

The number #23 is the one, displayed, and

consequently the disc 4C3, having its contacts arranged to give that-signal, isin operative position. As the tooth on the disc #2 next comes into position to make contact manner that has been described. This connects that line with a conductor rod' #:2 which is also in communication with the line through magnets P. Thus' a second stroke sounded in the same way as #2 and the signal 23 is thus completed during one complete rotation of. the shaft 14. 1f the arts are so arranged that the shaft vlitrotates a plurality of times for each operationof one of the arms 46 the sounding of the alarm 23 will be repeated accordingly.

Fig. 1 shows a troublecircuit by the magnet N, which we call a second alarm stop magnet. When everything is all right on the system and no signal isudiss played the current flows through this magnet and attracts the end of the lever T in opposition to a spring S, and this causesa contact at X to be broken. 7 But when the circuit is broken at one of the contacts 56 through the operation of one of the armatures G the magnet N is immediately rendered dead and the spring S forces the,

lever T back to the position shown. which closed the contact at X. This completes the "stantly to show the operator the condition to give the first stroke I g held up by themagnets, but not by the lock- IC operated given as arranged for. In this case a gong is shown at M. This trouble signalwill continue to operate until everythingis re- 7 storedto normal condition.

There is, another waym which this trouble signal can be given. The automatic movement of'the armature of the magnet Y to start the clock work also closes a contact V and'completes a'second circuit through the battery L, and signal M. The result of this is to cause this trouble signal to be given constantly at all times while the clock work is operating, ornot fully wound up, and also at all times when the current does notflow through the magnets N and Y. In either event this signal will be given conof the mechanism. I I

Y From what has been said it will be obvious that when the system is in normal'condition ready to operate, the armatures G are all ing plate, so that they can 'be released by the magnet and allowed to drop. These armatures hold up their respective arms 46 and therefore hold the discs 43 in inoperative condition, that is, with their'insulating surfaces 4-5 in contact with the plungers 42.

The magnets N andY are both energized so that the clock work is held from operating and the trouble circuit prevented from operating. The breakage of one ofthe branch circuits in which the call boxes E and thermo-switches D areloeated immediately releases and'displays a signal G. This has several immediate consequences. In the first place it lets down that arm 46 and swings the corresponding disc into such position that the selected contacts are made and ready to transmit the current to the magnet l whenever the shaft 14 rotates around' to the proper position.

ing contacts Stand thus de-energizes the magnets Y and N. The former releases its armature and thus automatically releases and starts the clock work so that the shaft operated constantly until the line is entirely restored co normal condition. [This trouble signal will keep operating until the thermoswitches D and call bOXQS E are all restored to normal condition and until all armatures It also breaks the main circuit through the conduct that may have dropped are moved upwardly by hand so as to-come under the influence of their respective magnets and held up, thus also restoring the respective arms and discs. Furthermore, if the clock is left unwound the detent thereof cannot enter the notch in the wheel 57 and consequently the contact V cannot be opened by the mechanism. Therefore, the clock has to be wound up by turning the wheel 57 around to the position shown in Fig. 6 before the trouble signal will stop operating.

It is to be understood also that, after one armature Gr, as for example, 23 has dropped as shown in Fig. l and the mechanism is in full operation, if some one turns in a call from another line, or it is done antomatically by the melting of a fusible switch plug, that armature G will also swing down on its pivot and be displayed at the central station. But as the locking plate 50 has previously moved to the left the arm 46 connected with this second armature is locked and cannot drop.v Consequently the operator is warned that another line is in trouble, but no alarm is given for this second line. The reason for this is that it frequently happens in case of a fire that some person will turn in an alarm from some near by station which does not'in'dicate a second fire. The operator at the central station in this case can have an opportunity to find out whether there is a second fire, and if there is not, no further alarm is given and nothing need be done by the operator except to restore, the two arinatures instead of one, after the alarm for the first one has been given. However, if there is a second fire the operator can, give that alarm by first restoring the first armature to proper position and holding it up, then operating the plate 50 by hand so as to allow the second arm to drop down and then releasing the plate so as to allow it to lock the first arm up with the others. Then the clockwork is simply wound, up and allowed to start and the second signal will be given.

Although we have illustrated and described only a single embodiment of the invention and shown it as applied only to a closed circuit installation, we are aware of the factthat many modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims.

Therefore, we do not wish to be limited to all the details herein shown and described, but what we do claim is i 1. In an electric alarm system, the combination with a main circuit and a branch circuit, of an electro-magnet in the branch circuit, an armature for the magnet, contact members connected with said main circuit beyond the branch circuit arranged and adapted to .be connected when said armature is attracted by the magnet so as to complete the main circuit, whereby when the armature is released the main circuit will be broken beyond the branch circuit, an alarm signal, a selecting device in series with the main circuit and in multiple with the branch circuit controlled by the releaseof said armature, and means whereby said selecting device will control the operation of said alarm signal and cause it to be operated to give a selected signal.

2. In an alarm system, the combination with a main circuit, having a plurality of branches in multiple, an electro-magnet in eachv branch, and an armature adapted to be held in a certain position by each magnet when energized and to move to another position when the magnet is (lo-energized and provided with means for displaying a signal when in one position, of a selector having an arm for each armature movable therewith, and mechanically connected with the selector, contact members arranged and 'adapted to be engaged by each arm when its armature is in one position for completing the main circuit through the arm, whereby when any arm is in one position, the main circuit will be broken, and an alarm device, said selector being connected with the main circuit and comprising means for controlling theoperation of said alarm device, and cans ing it tobe operated a predetermined number of times, with or without pauses, so as to give a signal representing a number, whenever said arm is moved to one position.

3. In an electric alarm system, the combination with a circuit having a plurality of branches in parallel, a plurality of electromagnets each connected with one of said branches and in parallel with each other, an armature for each electro-magnet arranged to be held up when the magnets are energized and adapted to be displayed when released by the deenergizing of the magnet, said circuit having contacts arranged in series, means connected with each arn'iature for completing the circuit through said contacts when all. of said armatures are held up and whereby when one of them. is displayed the circuit will be broken at that point, an alarm signal, and a selector connected with, and adapted to be set by, said armatures, said selector having means whereby the operation of said-alarm signal is controlled by it.

4:. In an alarm system, the combination of a selecting device comprising a plurality of series of contacts, a plurality of conducting members each in a position to be engaged by one series of contacts, means for normally holding said conducting members in a position in which the contacts will be out of contact therewith, and in position in which when turned slightly, a circuit will be made through the contact members at certaint points, a circuit having branches provided with means lor controlling the respective holding means, means n each of said branches for interrupting that branch and releasing the contact memberconnected surfaces thereon, means for normally hold-i mg each ,dlsc n a position in which thecon-' tacts for engaging it will be in contact with said insulating surfacesthereof the insulatingsurfaces of each disc being in such posi-] tion that when thedisc is'turned slightlya; circuit will be made through the jclisc atcertain points, a circuit having branchespro vided .withmeans for controlling the respective disc holding means, -means in eachi;of

said branches "for interrupting that branch and releasing the disc connected therewith,

an alarm signal, and means controlled by said discs for operating said alarln'signal.

i 6. In an automatic alarm system, the com-' bination of -a selectlngdev ce comprislng a' plurality of contacts'arrangedin a circle, a.

plurality'ot discs, each disc arranged lIlpOSl tion to be engaged by one circle of sa1d contacts said discs l121VlI1' lIlSHlEttHl and -con+ ducting surfaces thereon, an 'elcctro-magnetj for each of said discs, an armature adapted to be attracted and held up by each of said electro-magnets when energized, means con-o nectin each armature with onezot said discs for holding it'in. position when the respec+ tive magnet is energized in which the'contacts engaging it willbe in contact with in sulating portions of its surface, the con;

ducting surfaces or" each discbe'ing'insu'ch position that when the respecti'vemagnet is,

deenergized and the armature released, itwill cause the disc to be turned to a position in which a circuit will he made through the disc at certain points, ahcircuit; having branches each of WlllCl'l'COIIHQClJSiViillI one of said'magnets and having vineansin eachot said branches {or interrupting that branch and deenergizing the inagneuconnected therewith, an. alarm signal, a motor, and

means controlled by said discs for operating said alarm signal.

7. In an automatic alarm systenn'the-com bination of a selecting device comprising a plurality of conductors, each conductor-haw ing a plurality of contacts connected there-v with, a plurality of discs each discarranged in position tobe engaged by one seriesof' said contacts, said discs havingjinsulating and conducting surfaces thereon, means 0011:,

nectedwith each of said discs for normally holding it in a position in which all ofthe conductors engaging it will be in contact,

with insulating portions of its surface, the

conducting surfaces of each disc being in such position that when the disc isturned electrical connections willhe made through the disc at certain points, means for releasingsaid-holding means and causing the disc to? turn to make said electricalconnections,

means whereby one of the discs can be turned to'permit the passage of currents thro'ughthe disc, an intermittent current conveyor having separate current conveying elements each'connected with one of said contacts, and an alarm device constructed tobe operated. in accordance withthecou nections niadeby the discs and contacts.

,SLIn an automatic alarm system, the combination of a selecting'device comprising a plurality of parallel rods, each rod having a plurality vof contacts connected, therewith, said contacts being arranged in a plurality of circles, in difierent; planes, a plurality of discs, each disc, arranged in position to be engaged by one circle of said, contacts, said discs being mainly of conducting material but having insulating surfaces thereon, means for holding each disc in a positionin which all of'the contacts engaging it will be in contact with insulating portions of its surface, the uninsulated-surfacesof each disc-bemg in such position that whenthe made through the disc at certain points, a circuit having branches,means controlled by disc is turned, electrical connections will be eachbranch for operating the respective holding means, means in" each of said branches for" interrupting that branch whereby one of the discs will be turned to permit, the passage of a current through the disc and alongcertain of said rods, a plurality of branch circuits each connected with one of sa d rods, an interm ttent current conveyor having separate current conveyor eleine'ntseach connected with one of said last named branch circuits, and an alarm device constructed to be operatediuaccordance with the connections made bythe discs in said selecting device.

it selector for an alarm system com-- prising aplurality of parallel rods, each rod havinga plurality of contacts connected. therewith, said contacts being: arranged in a plurality o'tcircles in difierent planes, a plurality of discs, each disc arranged inpositionfto be engaged by one circle of said contacts,said discs being mainly of conducting material but having insulating surfaces thereon, means for holding each disc in. a positionin "which all of the contacts nections will be made through-the disc at certain points, means for operating the respective holding means, a plurality oi branch circuits each connected with one of said rods, and an alarm device constructed to be operated in accordance with the conthe discs in said selecting normally holding it in a position in which all of the conductors engaging it will be in contact withinsulating port-ions of its surface, the conducting surfaces of ea-ch disc being in such position that when the disc is turned electrical connections will be made through the disc at certain points means for releasing said holding means and causing the disc to turn to make said electrical connections, and whereby one of the discs can be turned to permit the passage of currents through the disc.

11.- ,A selector for an alarm system comprising a series of oscillatable discs having conducting and insulating regions, difi'erently arranged on the respective discs, a plurality of series of contacts, each adapted 'to engage the conducting regions of onelof the discs when the disc is turned to operative position, an arm connected with each disc for operating 1t, each arm having a conductor thereon insulatedfrom the arm, a contact point mounted in position to engage each conductor and make electrical contact therewith, when the arms are'in inoperative position, a circuit. connected with said contactpoints, and means controlled by said circuit for controlling the passage of currents to said contacts.

12. A. selector for an alarm system comprising a series of independently oscillatable discs having conducting'and insulating regions differently arranged on the respective discs, a plurality of series or contacts each adapted to engage the conducting regions of one of the discs when the'disc is turned to operative position, and n'ieans for controlling the passage of currents to said contacts. I

1,3; In an alari-u system,'the combination with a, signal movable to two positions, means fornormally holding said signal in one; of said positions for releasing it to permit it to moveto itsother position when said means is rendered inoperative, av se-' lector, means operated by the movement of said signal from one position to t-he other for setting the selector; to control its operation, means controlled: by the selector for giving a' selected alarm, and an auto arranged to move and be displayed when said means is rendered inoperative, a selector, motormeans for operating said selector, means controlled by the visible signal for starting the ymotor means when said signal is displayed, means controlledby the selector for giving a selected alarm, and automatic means for preventing the setting of the selector togive a different signal while the first named means is inoperative.

15'. In an alarm system, the combination wi'th'a' main circuit, having a plurality of bra-nches,-an electroqnagnet in each branch, and an armature adapted to be held in a certain position'by each magnet when energized and to move to another position when the magnet is de-energized, and provided with means for displaying a signal when in one posltlon, of a selector having an arm for each armature, movable therewith, contact members arranged and adaptedto be engaged by each arm when its armature is in one position for completing the main circuitthrough the arm, wherebywhen any arm is in one position the main circuit will bebroken, an alarm device, said selector being connected with the main, circuit and. comprising means for controlling the operation of said alarm device, and causing itto be operated a predetermined number of times to give a signal representing a num ber, whenever said arm is moved to the position for breaking the main circuit, and means operative upon the motion of any arm to that position for preventing the other arms from' moving to corresponding positions. y

16'. In a device of the class described, the combination with a selector having a plurality of arms, and selected signals on said arms but movable independently thereof, saidarms being movable to operative. and inoperative positions, of a locking device, andmeans whereby when an arm moves to operative position the other arms will be automatically locked in their initial inoperativepositions.

17. In deviceo'l the class described, the combination with a select-or havinga plurality of arms movable into-two positions, in one of which they are operative and in the other of which they are inoperative, and meansadapted to be set into operation by each of saidarms when moved to operative position for giving a selected signal, of a locking plate having means for engaging each of said arms while ininoperative position and holding them there, means for norm-ally holdingsaid locking plate in inop when released by said means, means controlled by each of said arms when moved to operatlve position for giving a selected sig nal, a locking plate for said arms arranged in position to lock the arms in their inop erative positions, means for normally moving said plate into its locking position, an electro-magnet connected with said locking plate and adapted to move it into unlocking position whenever said elertro-magnet is energized, and means whereby when oneof said arms moves into operative position while the magnet is energized, said magnet will be automatically disconnected from its source of power.

19. In a device of thecharacter described, the combination of a plurality of oscillata ble selector arms, an armature pivotally connected with the end of each arm, each armature having a character on its lower or front face, a series of electro magnets each in position for normally holding one of saidarmatures and its arm in a certain position, whereby it the magnet is deenergi'zed the armature will be free to swing away from the magnet to display said character and the arm will be free to move with the armature, a sliding locking plate an electro magnet normally holding said locking plate i in a-position in which all of said arms are free to drop.

20. In a device of the character described,

the combination of a plurality of selector arms, an armature connected with each arm,

each armature having a character, on its face, a series of electro magnets each in p0- srtmnfor normally holding one of said armatures and its arm in a certain position,

whereby it the magnet is de-energized the armature will be free to move away from the magnet to display said character, and the arm will be free to move with the armature, a locking plate, an electro-magnet normally holding said locking plate in a position in which all of said arms are free to move, a circuit connected with said last named magnet and having contacts one of which is adapted to be broken by the movement of any one of said arms, means whereby when said circuit is interrupted and they last named magnet deenergized, said locking'plate will be moved into a position to prevent all of the other arms from moving,

whereby the rest .of the armatures will be left free to move down.

21'. A selector for an alarm system coinprising a member having conducting anl insulating regions, a plurality of series of contacts each adapted to engage one of said conducting regions in certain positions thereofi an arm connected with each conducting region for operating it, each arm having a conductor thereon insulated therefrom, a contact point mounted in position.

to engage each conductor and make electri-' cal contact therewith whenthe arms are 111 inoperative position, a circuit connected armature connected with said detent, an

alarm circuithaving a pair of contact points I therein, means connected with said detent.

for holding said contact points apart when the armature is attracted by the magnet, and means for moving said parts together when the armature is released.

23. In a device of the character described, the combination with a circuit, and an electro magnet therein, of a seriesof movable selector members, each having means for completing contacts in said circuit when said selector means is in operative position and for interrupt ng said c1rcu1t when any ,one of them is moved to inoperative position, of a clock work connected with the selector mechanism for operating the same, a detent for preventing the operation of the clock work, an armature connected with said detent and adapted'to be normally held by the magnet in a position to keep the detent in condition to prevent operation of the,

clock work, an alarm circuit having a pair of contact points therein. means connected with said detent for holding said points apart when said armature is attracted by the magnet, and means for moving said parts together when the armature is released.

In testimony whereof we have hereunto set our hands, in the presence of two subscribing witnesses. i

Witnesses: ALBER E. FAY, QFORREST Wesson.

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