US930971A - Fire-alarm signal apparatus. - Google Patents

Description

W. H. KIRNAN.

PIRE ALARM SIGNAL APPARATUS. APPLIGATION FILED H1B. 17, 1909.

Patented Aug. 10, 1909.

2 SHEETS-SHEET 1.

Sme/Mom W. H. KIRNAN. FIRE ALARM SIGNAL APPARATUS.

APPLICATION FILED FEB. 17, 1909.

930,97 1 A Patented Aug. 10, 1909.

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wiLLIAM n, KIRNAN, oE BAYONNE, NEw JERSEY.

FIREALARM SIGNAL APPARATUS.

Specicaton of Letters Patent. Original application led November 7, 1908, Serial No. 461,452.

Patented Aug. 10, 1909. Divided and this application filed February 17,

190s. seriainoevaeas.-

To atl whom it may concern:

Be it known that I, WILLIAM H. KIRNAN, a citizenof the United States, residing at Bayonne, county of Hudson, State of New Jersey, have invented certain new and use-' ful Improvements in Fire-Alarm Signal Apparatus, clear, and exact description.

My invention relates to improvements in electric signaling has in which a single thermostat is employed in connection with a single signal boX to send in a plurality of different signals over a signal transmission circuit.

Another object of my invention is to provide a signal boX which after a signal vof one character has been transmitted, automatically sets itself so as to transmit a different signal when next operated, the signals preferably being warning danger and lire.

Another object of my invention is to provide means so that when the signal box is sending in a fire signal, a call will be sent in through the street fire alarm box in addition to the signal sent into the local receiving apparatus. Another object of my invention is to provide means for indicating the condition of the circuit controlled by the thermostat and to send in an audible alarm whenever the condition of that circuit is abnormal.

The following is a description of apparatus embodying my invention, reference being had to the accompanying drawings, in which- V Figure 1 shows diagrammatically a system embodying the invention. shows a development of thesignal wheel employed. Fig. 3 shows the circuit connections between the controllers of the transmission circuit and certain cut-out devices. Fig. 4 shows on an enlarged scale the thermostatic circuit controller.

Referring more particularly to the draw-` ings, 1 is the signal wheel of call signal box.

2 is a gear mounted on the shaft thereof.I and 3 is a driving gear meshingwith the gear 2.. This driving gear when free to move is drivenV by any convenient driving means, such as a spring 4, in the ordinary way. The gear 3 has near its periphery a the multiple of which the following 'is a full,

fire alarm apparatus, and' for its object to produce anY apparatusV Fig.: 2.

stop 5 slightly displaced circumferentially with relation thereto, and slightly farther removed from the periphery is a stop 6. These stops are engaged by a detent 7 pivoted at 8, and having connected to its lower vend an armature 9, which is actuated by an electro-magnet 10.v This detent 7 when the electro-magnet is denergized, is held by the spring 11 so as to lie in the path of the stop A6 4upon the wheel 3. When the electro-magnet 10 is energized so as to attract its armature 9, the detent is then moved so as to lie in the path of the stop 5 upon the wheel 3. The result is, that if the electro-magnet 10 is energized when the detent is in engagement with the stop 6, the wheel 3 is released so as to permit it to revolve in the direction of the arrow. lf the electro-magnet 10 becomes denergized before the wheel 3 revolves sufliciently to cause the stop 5 to engage the detent 7, the detent 7 is retracted. by the spring 11, so that it lies in the path of the stop 6 and therefore stops the revolutionof the wheel 3 when it has made one complete revolution. lf the magnet 10 re- `mains energized for a longer period than would be required for the wheel to make one revolution, the detent 7 is engaged by the stop 5 so that the wheel 3 is stopped just before a revolution is completed. The partial revolution, however, is sutlicient to send in all the signals that would be sent in by a complete revolution. lf at any time after the wheel has been stopped by the engagement of the stop 5 with the detent 7, the magnet 10 becomes denergized, the detent 7 is moved by the spring 11 out of the path of the stop 5 and intothe'path of the stop 6, permitting the wheel 3 to revolve a very slightdistan'ce corresponding to the position of those stops completing the incomplete revolution and placing the apparatus in condition so that when the magnet 10 is again energized the operation just described will be, repeated.

12, 13 and 14 are three circuit controllers .actuated by the signal wheel 1. These circuit controllers, as shown, consist of two contacts, the lower of which is in each instance a spring contact tending to separate' from its upper or companion contact and moved into engagement with the upper contact by the action of the c signal wheel 1, this signal wheel having a separate contact space for each lof the circuit controllers, there being different projections, or series of projections, for actuating the three circuit controllers respectively, the depressions permitting the several circuit controllers, when not shortcircuited, to break the circuit 15. For convenience in manufacture, the depressions sending inthe boX identifying signal and one long` signal, may extend way across the signal wheel. One of the other long signal notches must pass under controller 13 but not under 12 while the other long signal notch must pass under controller 14k but not under controllers 12 and 13, as shown in Figs. 1 and 2.

15 is a transmission circuit having a battery having a source of current 16, and a re-l lay 17 controlling a local circuit 18, which contains an alarm bell 19 and a recording electro-magnetic device 20, such as are usually employed in local receiving circuits.

TWhen one or more of the three circuit controllers 12, 13 and 14 are free to act, they transmit over the circuit 15 a signal consisting of three short signals followed by two short signals, which in turn are followed by one, two or three long signals. The three short signals followed by the two short signals indicate the number 32 of the particular signal box which is being operated. The following long signals indicate warning, danger 7 and fire, corresponding as to whether one, two or three of lsuch long signals are sent in, which depends on whether controller 12 acts alone or whether one or both of controllers -13 and 14 are free to cooperate therewith. For other signal boxes, of course, the signal wheels will be made so as not to send in the same signal box call 32 but, on the contrary to send in some other distinctive number. The warning, danger and fire signals, however, would be the same and would follow up the box signal call the same as above described. If all the controllers 12, 13 and let were free to control the circuit 15, the alarm which would be sent over the circuit 15 would correspond to the fire condition. lf the controller 14 were short-circuited, the alarm which would be sent in would correspond to danger condition. If both the controllers 13 and 14 were short-circuited, the mechanism would send in a warning call. The circuit controllers 13 and 14 are normally cut out of action by short-circuiting contacts 21 and 22 connected as shown in Fig. 3. These controllers are actuated by a cam surface 23, which is driven by a toothed member 24. This toothed member has three teeth 25, 26 and 27, one of which is engaged by a pawl 28 attached to the shaft of the gear 3, upon each revolution of said gear.

The parts are normally in the position shown in Fig. 1, having been moved to that position by the handle-29. When the gear 3 begins to revolve with the parts in the position shown in F ig. 1, it will, near the end of its first revolution, cause the pawl 23 to engage the tooth 25 and move the member 21, together with the cam surface 23, one step, with the result that the bearing portion of the short-circuiting device 21 comes upon a depressed portion of the cam surface 23, permitting the engaging members of the short-cireuiting device 21 to separate. An examination of the circuits as .shown in Figs. 1 and 3 discloses the fact thatI under these conditions the circuit controller 13 is no longer shortcircuited, and is therefore able to send in a signal corresponding to the recess 13, upon the signal wheel 1. YVhen the mechanism has been operated so that the gear 3 revolves a second time, the pawl 2S engages the tooth 26, causing the cam surface 23 to move another step, so that the portion of the circuit controller 22 bearing thereon reaches a depressed portion thereof. This permits the engaging contacts of the device 22 to separate, and thereby breaks the shortcircuit around the circuit controller 1l. Then the parts are in this condition, the revolution of the signal wheel sends in a signal, in the producing of which the recess laf* performs a part, the signal being sent corresponding to the tire signal above referred to. During the latter part of the revolution of the wheel 3, while it is sending in the fire signal, the pawl 2S engages the tooth 27 and moves the shaft on which the device 2li is mounted, to a still more advanced position. This shaft carries a bar 30, which, by the movement due to the engagement of the pawl 23 with the tooth 27 is moved so as to cause spring contacts 231-32 to engage other contact-s, completing circuits for the purposes hereinafter described.

33 is a roller detent engaging notches in 'the toothed member 2st so as to insure the movement of that member to a completo step and hold it yieldingly in the position to which it has been moved.

The spring contact 31 controls a local circuit 34, in which is located a street lire alarm box 35.

-16 and 47 are the two members of a thermostat consisting preferably of Zinc or .steel and hard rubber connected together at. the top and supported by bracket 4S and having their ends connected to a toothed member 119. Upon this toothed member there are two pawls 50 and 51, mounted in insulating bearings in a yoke This yoke is pivotally supported at 53 and has a slot at its lowe.l end, through which passes a screw 54, so that the yoke may be adjusted circumferentially about the pivotal support 53. The pawls 50 and 51 have spring extensions and 56, which are engaged by adjusting screws 57 and 53 so as to keep the forward ends of the pawls in engagement with the toothed member 49. an adjustable;contactscrew59, the lower end of which engages with the lower pawl 51. The two pawls 50 and 51 andthe rack 49 are so proportioned and located relatively to one another that the pawls are out of step, that is, so Athat when the rack 49 is moved the pawls 50 and 51 will leave the teeth with which they are in engagement at different times. l/Vhen the pawl 50 engages the first tooth, as shown in Figs. 1 and 4, the parts are so related that as the toothed member 49 moves tliepawl50 willy escape from its tooth first. This'causes the contact 59 to engage the pawl 51 and form an electrical connection between them for the purpose hereinafter stated. Whenthe pawl 50 is engaging the second tooth and the pawl 51 is engaging the third tooth, and the racl 49 is moved still farther to the' right, the first action will be for the pawl` 51 to escape from its tooth, thereby breaking the electrical engagement between the contact. 59 and the iawl 51. As the toothed member 49 moves still farther to the right, the electrical engagement is made again and then broken again, and the operation can be still furtherk repeated. Whenever the. electrical engagement is made or broken, one of the pawls acts to prevent the toothed-member from moving to the left. The pawls when once in engagement, remain in yengagement until the pawl 5l escapes its tooth, never mind how the toothed member 49 may move by reason of varying degrees of temperature or accident. rllhere is, therefore, absolutely no danger of having the electrical engagement between the members 50 and 51 made and broken, exceptwhen the conditions are such that it is desired they should be made and broken. The pivotal adjustment of the yoke 52 permits the relative relations of the pawls 50 and 51 to the rack 49 to be varied. Thus, as the yolre 52 is moved in either direction, the movement of the pawl 50 will be less than the movement ofthe pawl 51, and their relations to the rack 49 and also the degree to which they are out of step, can vbe thus modified.

rlhe thermostat carries a projection 60, which, when the rack 49 moves so as to disengage the pawl 50 from the iirsttooth, comes over a notch 61 in the arm of a pivoted semaphore 62, permitting the semaphore to swing about its pivot and thereby indicate that the thermostat has been actuated so as to move'its rack into the second or warning position. i u

Leading from the electro-magnet 10 is a circuit 72 having a source of current 73 inV series with the resistance 74. The pawl 50 is electrically connected to fone branch of this circuit and the pawl 51 is electrically connected to the other branch ofthis circuit,

Oneof theA pawls hasl with the result that when these two pawls are in electrical engagementv the resistance 74 is short-circuited. Similar pawls con` trolled by similar thermostats are connected at various points, as desired, along the circuit 72, as, for instance, at 75 and 7 6. lVhen the pawls 50 and 51 are brought into electrical engagement through the action of the thermostat, the current through the electromagnet l0 increases on account of the resistance 74 being cut out, with the result that the electro-magnet 10, which theretofore was practically denergized, becomes energized suliiciently to attract its armature 9 and actuate the detent 7, with the results heretofore described. When the toothed member 49 moves still farther to the left, under the influence of the thermostat, the electrical engagement between the pawls 50 and 51 is broken, the electro-magnet 10 becomes practically denergized, and the detent 7 is brought into the path of the projection G upon the wheel 3. Upon each successive predetermined degree of temperature rise, the electrical engagement between the pawls 59 and 5l is made and broken in a similar manner and the detent 7 actuated accordingly and the signal mechanism put in operation. As before described, the first signal will be a warning signal sent in through the action of the circuit controller 12` alone. This signal will be repeated a number of times, corresponding to the ratio of diameters of the gears 2 and 3,which is preferably a ratio of one to four.

ger position, the circuit controllers 12 and 13 coact in sending in the signal, and the signal is the characteristic danger signal. lhen the thermostat has reached the third contact making position, all three cir- ` cuit controllers 12,13 and 14 coact in sending in the signal, and the signal sent in is the lire signal.

in order to indicate abnormal conditions in the circuit 72, such as the accidental opening of the circuit, I place in the circuit a galvanometer 77 whose needle is slightly counterbalanced` by an arm 78. VVhen no current is flowing, the galvanometer needle is moved to the left, causing an engagement to be made with the contact 79. When current is flowing through the galvanometer, the galvanometer needle is held away from the contact 79. The Contact 79 is connected to one branch of the circuit 72, and the gah vanometer needle is connected electrically to the other branch of the circuit between the galvanometer coils and the battery 73, so that,when the electrical engagement is made between the needle and the stop 79, any break beyond the points where the stop 79 and galvanometer needle are connected would be shortcircuited. In order to cause ,such engagement to operate a signal, I place llVhen. the rack 49 reaches the nent contact making, or danan electric bell in circuit with at least a portion. oi the battery 7 3, the other terminal of the bell being connected to a contact 81, which is engaged by the detent 7 when the electro-magnet 10 is energized. The detent 7 is connected by the branch conductor 82 with the circuit in which the battery 73 is included, with the result that when the contact 79 is engaged by the galvanometer needle and the magnet 10 is energized so as to retract the detent 7, a circuit will be established by the engagement through at least a part of the electric battery 73, causing the bell to ring. The engagement ot the Contact 7 9 and the galvanorneter needle, however, causes the magnet 1() to be energized, so that when the contact 79 is engaged, the magnet 10 will always be energized and the circuit through the bell SO will be a complete circuit. The energizing of the magnet 10 not only completes the circuit through the bell 80, but, as before explained, releases the wheel 3, causing the signal wheel 1 to send in a warning7 call over the transmission circuit to the local receiving circuit.

The operation of the apparatus is as follows, it being assumed that the parts are adjusted as shown in Fig. 1. When for any cause .the temperature about the thermostat rises, the toothed member 49 is moved to the right until the detent 50 leaves the lirst tooth. This causes an electrical engagementto be made between the detent 50 and the detent 51, short-circuiting the resistance 74 in the circuit 72. This energizes the magnet 10 so as to actuate its armature 9 and cause the detent 7 to release the stop 6 upon the wheel 3. rThereupon the wheel 3 revolves and the signal wheel 1 actuates the circuitcontroller 12 so as to send a Warning call over the transmission circuit 15, said warning call consisting of the identitication number of the box and a long dash. It the temperature about the thermostat continues to rise, the pawl 51 leaves its tooth and breaks the electrical engagement between the pawls 50 and 51 denergizing magnet 10 and causing the wheel 3 to return to its normal position. The revolution of the wheel 3 causes the pawl 28 to engage the tooth 25 and move the toothed member 24 one step so that the short-circuiting contacts 21 are disengaged, leaving the circuit controller 13 tree to act upon the next revolution of the signal wheel. Upon a further rise in temperature, the thermostat causes the toothed member 49 to move still farther to the right until electrical connection is again established between the contacts 50 and 51, whereupon the electro-magnet 10 becomes again energized and the wheel 2, together with the signal wheel, performs another c ycle this time transmitting, in addition to the identification number of the box, two dashes, which `performs a third cycle.

is the signal for danger. During this operation the toothed member 24 has been moved still another step by the engagement of the tooth 2G so that the short-circuiting contacts 22 are disengaged, with the resultl that upon the next operation ot the signal wheel 1, the circuit controller 1-1- will also be irec to act. Tt' the temperature still vturther rises, the engagement between the pawls 50 and 51 tirst brea rs and subsequently is again made, whereupon the magnet 1.0 is again energized with the result that the wheel 3 is again released and together with thc signal wheely 1. Since the 'circuit controller 14 is free to act during this cycle, the signal transmitted is the lire signal, consisting of the box number 32 followed by three dashes. Toward the end ot' this third revolution of the wheel 3, the detent 2S engages the third tooth 27 upon the toothed. member 24, and causes the bar 30 to actuate the contacts 31 so as to establish the circuit through said alarm box.

The semaphore G2 is released when the bar 49 moves to warning position so that whenever a thermostat acts so as to send in a call, its semaphore 62 will indicate that it has so acted.

n case the circuit 72 is interrupted in any ot' its remote points, the galvanometer 77, which is in series therewith, becomes den ergized and its needle is brought over so as to engage with the contact 79, thereby completing the circuit through the magnet 10, causing the same to be energized so as to actuate its armature 9. The movement ot the armature 9, together with the engagement of the contact S1 and the contact 79, establishes a circuit through the electric bell S0 so that the bell sounds whenever the eircuit 72 is open at a remote point. The euergizing of the magnet 10 by the action ot the galvanolneter 77 also causes the wheel 1 to transmit the ordinary warning signal over the circuit 15.

The resistance 74 is such that the current passing through it when the circuits are complete is suflicient to balance the arm 7 S of the galvanometer 77 so as to cause the contact 79 to be disengaged, but is not suili cient to have any appreciable eliiect upon the electro-magnet 10, that is, the current liowing through the resistance 74 is not sutlicient to hold the armature 9 in attracted position at any time. Under normal conditions the magnet 10 is always practically denergized.

lhere the toothed member 49 is made of conducting material, parts ot' the pawls 50 and 51 therein should be made of insulatii'ig material, as shown in black, so that their engagement with the toothed member 49 will not establish an electrical connection between their conducting portions.

It is to be understood that whenever a warning call is sent in, it is the duty of some person to investi-gate the system and ascertain the cause of the troublevvhether other calls are sent in or not. The person who thus investigates ascertains the trouble. In case the call is sent in through the thermostat controller, he ascertains the cause of the rise in temperature andsees that it is removed. In case it is sent in because of the break of the circuit 72,7he repairs the break. lVhatever the cause, he sees to it that after the cause is removed the parts are manually restored to the positions shown in Fig. 1 so as to be ready for the sending in of a nevv Warning call for any other abnormal con` dition of the system or its surroundings. The alarm system is adapted to operate With various forms of sprinklers and sprinkling systems now in use and the system as a Whole is capable of various modifications Without departing from the spirit and intent of myV invention. It is further to be notedthat When the handle 29 is moved downward manually to its lovvermost limit and the detent 7 is moved to the left by the button 831, a re alarm Will be at once sent in'manual y.

It Will be seen from the foregoing that I have provided a single signal box which Will send in a plurality of different signals `for successive degrees of temperature, the sending of one signal setting the box for sending in the next signal of a different character. I have also provided means for actuating a street fire alarm box when a fire 7 signal is sent in, and at no other time. I have also provided means so that Whenever the circuit controlled by the thermostat-is interrupted at a distant point, that condition will be indicated.

This application is a division of my application No. 461,452, filed November 7, 1908.

What I claim is:

1. In an alarm system, the combination of a sending circuit, a signal disk having a plu-l rality of circuit-controller engaging surfaces, driving means therefor, aplurality of cirv cuit controllers engaging said surfaces respectively and controlled thereby, so as to each send a dierent signal over said sending circuit when free to act, means for cutting in to electrical action one or more of said circuit-controllers, said cutting-in means being actuated by said driving means, and means for starting and stopping said driving means.

2. In an alarm system, the combination of a sending circuit, a signal member having a plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit controllers engaging said surfaces respectively and controlled thereby, so as to each send a didere'nt signal over said sending circuit when free to act, means for cutting in to electrical action one 0r more of said circuit controllers, said cutting-in means being actuated by said driving means, and an electro-magnetic detent controlling said driving means.

3. In an alarm system, the combination of a sending circuit, a signal member having a plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit controllers engaging said surfaces respectively and controlled thereby, so as to each send a different signal over said sending circuit When free to act, means for cutting in to electrical action one or more of said circuit controllers, said cutting-in means being actuated by said driving means, an electromagnetic detent controlling said driving means, and a thermostatic circuit-controller controlling the circuit of said electro-magnetic detent.

l. In an alarm system, the combination of a sending circuit, a signal member having a plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit-controllers engaging said surfaces respectively and controlled thereby, so as to each send a different signal over said sending circuit when free to act, means for cutting in to electrical action one or more of said circuit controllers, said cutting-in means being actuated by said driving means, an electro-magnetic detent controlling said driving means, the circuit of said electro-magnetic detent being normally closed through a resistance, and a thermostatic circuit controller short-circuiting said resistance When abnormally heated.

5. In an alarm system, the combination of a sending circuit, a signal member having a plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit controllers engaging said surfaces respectively and controlled thereby, so as to each send a different signal over said sending circuit When free to act, means for cutting in to electrical action one or more of said circuit controllers, said cutting-in means being actuated by said driving means, an electro-magnetic detent controlling said driving means, the circuit of said electro-magnetic detent being normally closed through a resistance, and a thermostatic circuit-controller making and also breaking a short circuit around said resistance for each of a plurality of predetermined successively increased temperatures.

6. In an alarm system, the combination of a sending circuit, a signal member having a plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit-controllersengaging said surfaces respectively and controlled thereby, so as to each send a different signal over said sending circuit When free to act, means for cutting in to electrical action one or more of said circuit-controllers, said cutting-in means being actuated by said driving means, an

`electro-magnetic detent controlling said driving means, the circuit of said electro-inagnetic detent being normally closed through a resistance, and a thermostatic circuit controller making and also breaking a short circuit around said resistance for each of a plurality of predetermined successively increased temperatures, and an alarm receiving relay in said sending circuit and con-` trolled by any of said plurality o-f circuit controllers when free to act.

7. In an alarm system, the combination of a sendingcircuit, a signal member havinga plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of contacts engaging said surfaces respectively and controlled thereby, so as to each send a .ing circuit and controlled by any of said plurality of circuit-controllers When free to act, and a recording apparatus controlled by said relay.

8. In an alarm system, the combination of a sending circuit, a'signal member having a plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit controllers engaging said surfaces respectively and controlled thereby, so as to each send a different signal over said sending circuit when free to act, means for cutting into electrical action one or more of said circuit controllers, said cutting-in means being actuated by said driving means, an electro-magnetic detent controlling said driving means, the circuit of said electromagnetic detent' being normally closed through a resistance, and a thermostatic circuit-.controller making and also breaking a short circuit around said resistance for each of a plurality of predetermined successively increased temperatures, an alarm receiving relay in said sending circuit and controlled by any of said plurality of circuit controllers when free to act, and a bell controlled by said relay.

9. In an alarm system, the combination of a sending circuit, a signal member having plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit-controllers engaging said surfaces respectively and controlled thereby, so as to each senda different signal over said sending` circuit when free to act, means for cut-- ting into electrical action one or more of said circuit controllers, said cutting in means being actuated by said driving means, an electro-magnetic detent controlling said driving means, the circuit of said electromagnetic detent being normally closed through a resistance, and a thermostatic circuit controller making and also breaking a short circuit around said resistance for each of a plurality of predetermined successively increased temperatures, an alarm receiving relay in said sending circuit controlled by any of said plurality of circuit controllers when free to act, and a lire alarm call signal actuated by said cutting-in means when in a position corresponding to lire l0. In an alarm system, the combination of a sending circuit, a signal member having a plurality of circuit-control]er engaging surfaces, driving means therefor, a plurality of circuitlcontrollers engaging said surfaces respectively and controlled thereby, so as to each send a ditlierent signal over said sending circuit when free to act, means for eutting into electrical action one or more of said contacts, said cutting-in means being actu ated by said driving means, an electro-magnetic detent controlling said driving means, the circuit of said electro-magnetic detent being normally closed through a resistance, a thermostatic circuit controller short-circuiting said resistance when abi'lormallyv heated, and a galvanometcr located in said electro-magnetic circuit, said galvanometer being balanced against normal current and short-circuiting contacts actuated by said galvanometer when denergized.

ll. In an alarm system, the con'ibination of a sending circuit, a signal member having a plurality of circuit-controller engaging surfaces, driving means therefor, a plurality of circuit controllers engaging said surfaces respectively and controlled thereby, so as to each send a different signal over said sending circuit when free to act, means for cutting into electrical action one or more of said circuit controllers, said cutting-in means being actuated by said driving means, an electro-magmtic detent controlling said driving means, the circuit of said electro -magnetic detent being normally closed through a resistance, a thcrmostatic circuit controller short-circuiting said resistance when abnormally heated, a galvanometer located in said electro-magnetic circuit between the thermostatic controller and said electro-magnet, said. galvanometer being balanced against normal current, and short-circuiting contacts actuated by said galvanometer when deenergized.

l2. In an alarm system, the combination of a sending circuit, a signal member having a plurality of circuit-controller engaging surfaces, driving` means therefor, a plurality of circuit controllers engaging said surfaces respectively and controlled thereby, so as to each send a different signal over said sending circuit When freeto act, means for cutting into electrical action one or more of said circuit controllers, said cutting-in means being actuated by said driving means, an electromagnetic detent controlling said driving means, the circuit of said electro-magnetic detent being normally closed through a resistance, a thermostatic circuit controller shortcircuiting said resistance when abnormally heated, a galvanometer located in said electro-magnetic circuit between the thermostatic controller and said electro-magnet, said galvanometer being balanced against normal current, short-circuiting contacts actuated by said galvanometer When denergized, and an electric bell having a circuit controlled by the armature of said controlling electromagnet.

13. rIhe combination of a signal Wheel having a plurality of signal faces, a plurality of circuit controllers engaging therewith, a signal circuit controlled by any of said controllers when free to act, a gear for driving said signal Wheel, a detent for releasing said signal wheel and stopping the same after it has sub? stantially l completed a plurality of revolutions, means actuated by said driving mechanism for cutting into circuit said controllers one at a time for each successive revolution of said gear.

14. In an alarm system, the combination of a signal Wheel, a plurality of circuit controllers engaging therewith, each adapted to send in a dilerent signal Whenever free to act, driving mechanism for said signal Wheel,

'for a predetermined increase in temperature,

a signal boX magnet in said circuit and controlled by sald thermostat, a signal Wheel released by said magnet, means for automatically causing said signal Wheel to send in different alarms during successive cycles upon being released by said magnet a plurality of times.

16. In a tire alarm system, the combination of a circuit, a thermostat making and breaking said circuit a plurality of times for a predetermined increase in temperature, a signal boX magnet in said circult and controlled by said thermostat, a signal Wheel released by said magnet, a plurality of controllers diierently actuated by said signal Wheel, and means for automatically cutting said controllers into action one at a time during each cycle of said signal Wheel When released by said magnet a plurality of times.

WILLIAM H. KIRNAN.

Witnesses:

H. B. BROWNELL, M. E. GARRETT.

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