US2098133A - Automatic telephone alarm - Google Patents

Description

Nov. 2, 1937. w CARNAHAN 2,098,133

AUTOMATIC TELEPHONE ALARM Filed Feb. 9, 1953 7 Sheets-Sfleet 1 [Z il hrlmian Nov, 2, 1937.

R. w. ,CARNAHAN 2,098,133

AUTOMAT I C TELEPHONE ALARM Filed Feb. 9, 1953 v 7 Sheets- Sheet 3 Nov. 2, 1937.

R. w. CARNAHAN 2,098,133

AUTOMATIC TELEPHONE ALARM Filed Feb. 9, 1953 7 Sheets-Sheet 4 NOV; 2, 1937. R CARNAHAN v 2,098,133

AUTOMAT I C TELEPHONE ALARM Filed Feb. 9, 1933 7 Sheets-SheeLfi q I 105 j 10/ 1 404 i 1 Fly 15 I 12 Wamafialz W VWW whoa/M411 0 R. W. CARNAHAN AUTOMATIC TELEPHONE ALARM Filled Feb. 9, 1953 7 Sheets-Sheet e Nov. 2, 1937.

Patented Nov. 2, 1937 UNITED STATES PATENT OFFICE 1 AUTOMATIC TELEPHONE Application February 9, 1933, Serial No. 655,985

23 Claims.

The invention relates to a method and apparatus for transmitting burglar and/or fire alarms over a telephone circuit, and is a continuation in part of my prior application for Automatic telephone alarms, Serial No. 637,579, filed October 13, 1932.

It is known that certain attempts have been made to produce means for transmitting such alarms over manually operated telephone systems but such devices depend for their successful operation upon the human element, namely, the operator at the telephone exchange who must receive the predetermined message from the alarm mechanism and either transmit the same to police or fire headquarters or manually make a tele phone connection therewith.

it is also known that attempts have been made to produce alarm mechanism for operating upon automatic telephone systems in which automatic dialing mechanism and sound recording transmitters have been associated with and operated upon existing rented telephone instruments.

An object of the present improvement is to pro: vide an alarm mechanism for association with an automatic telephone system and adapted to operate as a telephone but so constructed and operated that it will automatically transmit a pre determined message or signal in such manner that the operation of the mechanism is both inaudible and imperceptible to anyone in the vicinity of the apparatus.

The invention is designed to deal with and combat the methods of present day criminals and to cause the criminal to unknowingly operate an initiating device which inaudibly and imperceptibly, at the point of operation, transmits a predetermined message or signal over an ordinaryautomatic telephone'system to the desired recipient of the message. As is well known, police headquarters in cities where police radio cars or cruising cars without the intervention of human operation. With such an arrangement at police headquarters it will be seen that with the present method and apparatus a burglar at the very instant of his attempted burglary will unknowingly cause the inaudible and imperceptible operation of mechanism which will transmit over the telephone system and through the broadcasting apparatus at police headquarters directly to the radio equipped police cars cruising the streets so that any car or cars which might happen to be in the immediate neighborhood of the burglary will be apprised thereof at the very instant the crime is being perpetrated, all of this taking place without any visible or audible warning to the criminal.

The invention contemplates the provision of such automatic alarm transmitting mechanism with an initiating device therefor located adjacent to any place where moneys or other things of value are stored, such as a cash register, cash drawer, safe, vault or the like, the initiating device being so constructed and operated that an unauthorized person' in approaching the place where things of value are kept will unknowingly cause the initiating device to operate so as to start the operation of the automatic signal tran mitting mechanism.

The invention further contemplates the provision of an inhibiting device which may be operated by an authorized person to momentarily render the initiating device inoperative whereby the authorized person may have access to the cash drawer, cash register or other place where moneys or valuables are kept without initiating the operation of the alarm mechanism.

A further object of the improvement is to provide means whereby this inhibiting device will automatically return to normal or inoperative condition, without the necessity of any manual resetting thereof, the moment the authorized person moves away from the vicinity of the cash drawer or other place where valuables or moneys are kept, whereby the entire device is always normally in condition to be automatically operated to transmit a signal the moment an unauthorized person approaches said point of valuables.

More specifically the initiating and inhibiting means may comprise an initiating relay, the energizing of which places the alarm mechanism in operation, this relay being located in a normally open circuit which is closed through the body of a person approaching the point where moneys or valuables are kept; the inhibiting means including a relay adapted to be energized by the performance of certain operations by an authorized person, the energizing of the inhibiting relay opening the circuit to the initiating relay and preventing the same from being energized.

The initiating and inhibiting means may include a circuit, or series of electric circuits in which the initiating and inhibiting relays are located and in which is located a mat or pad placed upon the floor adjacent to the cash register or other point to be protected and having therein a plurality of electric conductors located in oppo- Site sides of a circuit adapted to be closed by a metal sole or heel plate or other means upon the shoe of an authorized person.

This, together with a dial device adapted to be manually set each time by the employee or other authorized person approaching the cash drawer or other point to be protected, closes the circuit to the inhibiting relay, energizing the same and opening the circuit to the initiating relay so as to prevent operation of the signal transmitting mechanism. i

An unauthorized person stepping upon the mat or pad with or without a metal plate or similar device upon his shoe, and without setting the dial to the proper position, will not cause the inhibiting device to operate, thus rendering the initiating relay operative. and by touching the cash drawer or other place protected by the mechanism, allows a positive current to flow through the floor pad and through his body to the cash drawer, which is electrically connectedwith the grid of an amplifying tube, thus causing a positive current to oppose the C-bias current normally imposed upon this grid, the positive current being of sufficient strength to change the condition of the grid from a negative to a positive charge and permitting an excess flow of current through the plate circuit of the tube to the initiating relay, energizing the same and starting the operation of the signal transmitting mechanism, all of which is inaudible and imperceptible to the criminal.

A. further object of the improvement is to provide an apparatus which as it starts to operate will automatically prepare the telephone line for dialing by cutting out the usual secondary coil and the test phone if one be incorporated in the mechanism, and which will then automatically call the police department or any other station for which the machine may be set, means being provided for dialing the proper telephone numher where the apparatus is used in connection with a dial system, a predetermined message being then delivered over the telephone lines by.-

means of a phonograph record and an automatic telephone transmitter or reproducer which are automatically put into operation at the proper time, said message being repeated anydesired number of times, means being provided for repeating the call any desired number of times.

Another object of the improvement is to provide mechanism ofthis character which is driven by an electric motor, spring motor or other suitable source of power, the circuit to which is arranged to be automatically closed by an initiating means which may be so located as to be tripped by an unauthorized person entering the premises, means being actuated the starting of the motor to automatically out said initiating means out or" the circuit so that tamperingwith the same will 'not stop the operation of the motor.

Another objector the improvement is to provide means for automatically shunting out the automatic telephone transmitter or reprbducer during the time the "telephone number is being dialed.

Another object or" the improvement is to provide for the operation of the initiating means by the mere presence or an unauthorized person in the vicinity of the valuables to be protected.

The above and other objects may be attained by'providing an apparatus as hereinafter described and illustrated which will automatically accomplish by electrical and mechanical means th same function as a human being in using a aoeaiss telephone of a dialing or nondialing system to call a desired number and deliver a message over the telephone.

An embodiment of the invention thus set forth in general terms isillustrated in the accompanying drawings, in which Figure l is a top plan view of the improved automatic telephone alarm to which the invention pertains, the turn-table for the phonograph record being removed-and. parts being broken away from the purpose of illustration;

Fig. 2, a vertical sectional view through the apparatus illustrated in Fig; 1, taken as on the line Fig. 1;

Fig. 3, a side elevation of the apparatus shown in the previous figures looking from the left as viewed in Fig. i;

Fig. 4, a plan sectional view taken as on the line Q- l, Fig. 2;

Fig. 5, a plan sectional view of the clutch mech anism and cooperating parts, taken as on the line 55, Fig. 2, and showing the parts in the normal or initial position;

Fig. 6, a similar view showing the position of the clutch and cooperating parts immediately after the motor has started to operate and before the alarm operating mechanism has been set into operation by the clutch;

Fig. "I, a. similar view showing the position of the parts when the clutch is about to engage the alarm operating mechanism;

Fig. 8, a similar view showing the position of the parts at the end of a complete operation;

Fig. 9, a fragmentary view of the motor contacts immediately after the motor has been started by the trip switch;

Fig. 10, a similar view showing the position of the motor contacts after a complete operation of the apparatus;

Fig. 11, a'diagrammatic view of a simple cir cuit for the apparatus;

Fig. 12, a similar view showing a circuit provided with mechanism for cutting out the ordinary telephone instrument during the operation of the apparatus;

Fig. 13, a diagrammatic view of the motor circuit and trip switch;

a diagrammatic view oi the initiating and inhibiting circuits and devices;

Fig. 15, an elevation of one of the dials of the inhibiting device;

Fig. 16, a transverse sectional view through the employees magnetic dialing switch;

Fig. ii, a similar view of the managers con trol dial setting switch for the inhibiting means;

and I Fig. 18, a diagrammatic view of the entire systern.

Similar numerals refer to similar throughout the drawings.

The mechanism comprising the signal tranw mitting apparatus is intended to be housed in a suitable ease of steel or the like which will prevent tampering with the same and the terminal connections from the mechanism to the outside telephone lines and power lines are also encased so as to prevent cutting of the lines or otherwise tampering therewith. Tampering with the case or terminal connections from the mechanism to outside telephone or power lines or initiating devices will instantly trip the mechanism. The mechanism may be mounted upon a frame comprising the upper and lower plates it and M respectively, connected in spaced relation as by the posts it. A motor it, which is illustrated parts ill arm 2| is fixed upon the underside of the worm gear "Band has pivoted to its underside, as at 22, a drive pawl 23 which forms part of the clutch mechanism of the apparatus.

The drive pawl is provided at one end with a spaced pair of notches 24 and 25 for selective engagement by the spring pressed detent 26 pivoted as at 2! upon the underside of the drive pawl arm 2! and normally urged into engagement ,with said notches as by the spring 28. The opshaft 5|.

posite end of the drive pawl is provided with the depending tapered cam lug 29 and a second cam lug 30 is fixed upon the underside of the driving pawl at a point intermediate its ends.

The record shaft drive disk 3! is fixed upon the lower portion of the record shaft l8 below the drive pawl 23 and provided upon its upper surface with the lug 32 for cooperation with the lug 29 of the drive pawl for throwing the drive pawl out into driving position so that the driving .lug 3B thereon will engage the lug 32 in order to drive the disk 3i and shaft [8 continuously throughout the entire operation of the apparatus.

The stop arm shaft 33 is vertically disposed through suitable hearings in the plates iii and ii and has fixed thereon the stoparm which is in the form of a bell crank comprising the arms 34 and The arm 34 of the stop arm is provided with a stop lug 3B for engagement with the stop shoulder 31 of the record shaft drive disk for stopping rotation of the record shaft at the proper time.

A latch (iii is pivoted as at 35 upon the arm 34 of the stop arm for holding the stop arm in the initial or reset position, this latch being pro vided with a notch for engaging the stop shoulder tl in this position, a spring ii being provided for normally urging the latch toward the drive disk 36.

The arm 3d of the stop arm "bell crank is provided near its end with the cam portion 42 for engagement with the drive pawl 23 in order to throw the stop arm to the operative position,

withdrawing the lug 43, upon the end of the arm 35, from engagement with the-notch 44 in the stop disk 45.

A detent it is pivoted as at 4'! upon the underside of the arm 34 of the stop arm, a spring 48 being provided for normally urging the opposite end of the detent into the path of the lug 49 provided upon the underside of the drive disk 3!] in order to prevent the same from being accidentally rotated in the reverse direction.

The stop disk is fixed upon'the tubular shaft 50 which may be journaled upon the dialing shaft 51 which is also vertically disposed within the apparatus and journaled through the plates i0 and II.

A pinion 52 is fixed upon the record shaft 48 and meshes with a gear 53 fixed upon the dialing An arm 54 is also fixed upon the dialing shaft and provided with a depending pin 55 which cooperates with the Geneva wheel 58 fixed upon the tubular shaft 51 which may be journaled upon the record shaft l8, thus imparting intermittent motion to said tubular shaft. This intermittent motion is in turn imparted to the tubular stop shaft 50 through a pinion 58 fixed upon the tubular shaft 5'! which meshes with a gear 59 fixed upon the tubular stop shaft 50.

The off-normal break wheel 60 and the dialing break wheel 6| are fixed upon the dialing shaft v 5|, preferably being insulated from each other and from the shaft as by the insulation disks 6! and insulation bushing 63, and pinned together as at 64, an opening 55 being provided in the lower disk to receive the stud 66 protruding upward from the gear 53.

A turn-table 61 of any usual and ordinary construction such as is ordinarily used upon phonographs may be fixed upon the upper end portion of the record shaft l8 and is adapted to support a phonograph record 68 which may have inscribed thereon any suitable message such as Police depart-merit, robbery, 1940 East 105. This message may be repeated upon the record any desired number of times so as to assure the reception of the message at the police department.

Indicated generally at 69, and hereinafter referred to as an automatic telephone transmitter or reproducer, is a device, mounted upon the arm 10 for silently transmitting the message from the record over the telephone circuit. This device may comprise an electric pick-up such as used in talking pictures; a reproducer and transmitter united in a soundproof case; or a standard automatic telephone transmitter with the arm of the needle Eli attached directly to the center of the diaphragm thereof. One end of the arm '10 is pivoted upon the top plate 5G, both vertically and horizontally, as shown at l2 and 73 respec tively, and the other end of the arm 16 is provided with a'roller 74 which is adapted to ride upon the reproducer return arm 55 provided near opposite ends with stops 76 and i! for limiting the movement of the reproducer.

The return arm 175 may be in the'form of a bell crank pivoted as at 58 to a bracket 19 carried upon the top plate it). The depending angular arm 88 of said bell crank is pivotally connected as at 88 to one end of a link 82, the other end of which is pivotaliy connected as at 83 to one end of the arm return lever 84 which is of angular form, the opposite end being pivoted as at 85 upon the top plate 58.

A roller 88 is mounted upon the lever 84, inter= mediate the ends thereof, and adapted to he en gaged by the cam lug 8'! fixed upon the upper surface of the Geneva wheel 56. A cam ring 88 is fixed upon the underside of the Geneva wheel 56 and provided with a notch 89 adapted to receive the angular end 99 of the lever 9i which is fixed upon the shaft 92 journaled through the top plate l0 and having the contact lock-out arm 93 fixed to its upper end and arranged to normally hold the off-normal contacts and dialing contacts in the position shown in Fig. 11 of the drawings.

These oil-normal contacts comprise three spring contact members 94, 95 and 96 insulated from each other as at 91, the central member 95 being bent to form a tooth 98 adapted to ride upon the surface of the off-normal break wheel 60 and having at its free end an insulation block 99 for engagement with the look-out arm 93 which, as shown in the drawings, normally holds the tooth 98 out of contact with the periphery of the break wheel 50, the contacts 94 and 95 being closed while thecontact 9B is spaced from the adjacent central contact 95.

The stop arm shaft 33 has the contact reset arm I 00 fixed to its upper end for cutting the initiating means or trip switch ti l out of the circuit to the motor 113 as soon as the switch is tripped and the apparatus put into operation, this lacing for the purpose of preventing the motor from losing stopped by anyone opening the switch Mill or tampering with the wiring thereto.

This circuit is shown in Fig. 13 in which th line wires it?! and M33 are shown as supplying current to the circuit. The wire M32 may be con nected to one side of the motor 623, the other side thereof being connected as by a wire with the central spring contact which is provided at its free end with an insulation block received the notch till of the reset lever 11%. The other line wire leads-to one contact ltd of the trip switch tut, which may be located in any suitable position where it may he accidentally tripped by an unauthorized person entering the premises.

if desired, a plurality of these trip switches may be located at different points upon the premises, all being in parallel in the circuit so that the closing oi any one of the switches will close the circuit to the motor. A wire [Hi9 leads from the other contact of the switch to the spring contact lid located upon one side of the contact a contact Eli being located upon the other side thereof and connected by a wire M2 to the line wire With the apparatus set in position to be oper ated, the switch Hill is open as shown in Fig. 13

and the contacts and till are in contact with each other, the contact it i being separated from the contact 6%.

When the switch lot is closed, it will be seen that the circuit to the motor is closed through the wire l st, contact switch blade lull, wire contacts Md and l wire tilt to the motor their to the other side of the line by the wire W2. Immediately upon starting of the arcparatus the arm lot is swung to the left, as will he later described in detail, breaking the contact between the contacts W5 and i ill and moving the contact into contact with the spring contact l l 6, thus closing the circuit to the motor through the wires and H2, contacts-iii and wire [Hi l to the motor and then from the other side oi the motor to the other side of the line through the wire Gilt, cutting out the switch from the circuit.

A latch lever M4 is pivoted as at upon tun 3 the reset arm tilt and provided with a spr M to normally urge the right-hand end of the some downward. In the normal reset position as shown in Fig. i, the edge of the lever rests against the insulation block ill! on the righthand contact Bill which is in contact with the center contact Hil When the reset has been swung to the left as the apparatus starts to operate the shoulder Hill of the latch engages the insulation clock. ill, holding the contact lit away from the middle contact Gilt, thus holding the circuit to the trip switch till open. v

When the apparatus finishes a complete oper ation, the reset arm tilt is automatically swung back to the position shown in Fig. 9, as will be later described, breaking the contact between Wit and M l and holding the contact between MP and lit open, as shown in Fig. 10.

The reset lever is provided with a curved finger M the end of which is located adjacent to the curvedencl Mt of the reset arm latch and a reset slide GM is slidably mounted upon the top plate flii,being provided with longitudinal slots 922 engaged by studs in the plate, a spring 526 normally holding the slide in the inoperative acetates position and out contact with the reset arm latch finger, as shown in Fig.

When it is desired to reset the machine for operation, the slide till is pushed toward the reset arm latch and finger, the upturned end E of the slide engaging both of said members and moving the parts back to the reset position shown in Fig. 1. In order to easily operate the reset slide, a lever E26 may be fulcrumed intermediate its ends, as at 521 upon a bracket the lower end thereof pivotally engaging in the notch lilsl in the upturned angular flange upon the reset slide, while the upper end of the lever extends upward above the turn-table where it is easily accessible for manual operation.

For the purpose of operating the line closing contacts, a lever ltl is fixed upon a Vertical shaft 632 journaled through the top plate to, said lever being located beneath said top plate and adapted to be engaged by a depending cam lug 633 fixed upon the underside oi": the large gear shaft tiltis also journalecl through the top plate ill and has fixed thereon. a lock-out lever provided at its free end with a notch adapted to engage a. shoulder upon the lever lot as will be later described, a pull spring 03E? being connected at opposite ends to the lovers E30 and for normally holding said levers in contact with each other. A lever is also fixed upon the shaft 134% and provided with the angular end S lt adapted to be engaged by the stud Ml fixed upon the underside of the Geneva wheel The line closingcontact arm M2 is fixed upon the shaft i232 and adapted to contact with the insulated block W3 upon the line closing spring contact Mil to normally hold the same out of contact with the contact member i 'l Where it is not desired to cut the regular telephone in strunient out of the circuit when the apparatus is put into operation, the circuit may be as shown in rig. ll of the drawing in this figwe the wires leading into the telephone instru rnent Ht 2 e shown at i 'll and A wire i leads from the line i to the movable dialing contact liiil which is spring contact arranged to normally urge the tooth into the notches upon the dialing contact break wheel said notches being grouped in. any necessary arrangement to rnalse the proper number of impulses to connect the circuit with the phone at police headquarters or other des' "ed station in the manner customary in dialin phone systems. This movement of the contact arm makes and breaks the contact with the contact arm which is connected as by a I re 65 with the movable oi'imornial con tact and which also leads to the the wire leading from the the oil-normal contact The line wire Mil is connected by a wire with the usual primary coil it'll of the telephone circuit, a wire liiil leading from the other end of said coil to the secondary coil ifilland being also connected as at l to the line closing contact iii. A wire itl may lead from the other side of the secondary coil 5% to the off-normal contact a l and the condenser M52 and test phone Hi3 may be located in said line.

Where it is desired to cut the regular telephone reproducer to instrument l lt'out of the circuit during the operation of the apparatus, in order to prevent interfering with the operation of the alarm mechanism by a person attempting to use the regular telephone instrument or cutting the wires thereto, the circuit may be as shown in Fig. 12.

In this figure the telephone line wires are indicated at I64 and i653. It is necessary in this case to use two sets of line closing contacts, each set comprising three spring contact members. One of these sets of contacts is shown comprising a lower contact 545a, a central contact I44a,

those above described, the central contact I441).

being also operated by the arm I42. The line wire I64 is connected to the contact I44b and the contact i662) is connected by a wire I61 with the telephone instrument I46, a wire I68 leading therefrom to the contact 566.

The contact MM is connected to the line wire 165 and a wire I69 leads from the contact I45a to the primary coil 151 which 'is connected by the wire I58 to thesecondary coil I59 which leads to the contact 94 of the off-normal contacts and may have the condenser I62 and test phone 163 v interposed therein as in the circuit shown in dialing contact is connected by a wire I'II with the contact |45b of the line closing contact.

In the operation of the apparatus, when the switch MI is closed the circuit is completed from the line wire I03 through contact I08 and switch blade IOI, wire I09, contacts H0 and I05, wire I04 through the motor I I3 to the line wire I02, starting the motor; The worm I5 upon the motor shaft immediately rotates the worm gear I6, ro-

tating the bushing or tubular shaft I1 therewith.

The drive pawl arm 2|, which is carried by the worm gear I6 immediately starts to rotate from the position shown in Fig. 5, through the positions shown in Figs. 6 and '1, carrying with it the drive pawl 23.

the drive pawl contacts with the lug 36 upon the stop arm 34, swinging the stop arm outward and then as shown in Fig. 7, contacts with the cam portion 42 upon the stop arm, further swinging the stop arm sufficiently to withdraw the lug 43 thereon from the notch 44 in the stop disk 45,

as shown in Fig. '1.

The stop arm shaft 33 is thus oscillated in the direction of the arrow shown in Fig. '1 and swings the contact reset arm I00, carried thereby, to the left, as viewed in Figs. 1 and 13, breaking the contact between the contacts I05 and H0 and moving the contact I 05 into contact with the contact III, cutting the trip switch |0| out of the circuit to the motor so that the opening of the switch orcutting of the wires thereto will not stop the motor. This position of the reset arm and contacts is shown in Fig. 9 and it will be seen that at this point the latch lever 4 has dropped down upon the insulation block In at the end of the contact 0 so as to engage the shoulder N8 of the latch lever with said block.

As the drive pawl continues to rotate past the position shown in Fig. 7, the depending lug 30 thereon engages the lug 32 upon the upper surface of the record shaft drive disk 3|, rotating the record shaft I8 therewith. The pinion 52 upon the record shaft, through the gear 53, starts to rotate the dialing shaft 5| and with it the stop disk 45, thusimoving the periphery of the same against the lug 43 upon the stop arm and holding the stop arm in the position shown in Fig. 7 throughout a complete revolution of said 9 stop disk.

As the dialing shaft starts to rotate, the break wheels 60 and 6| carried thereby are rotated in the direction of the arrows shown in the drawings. First, the cam lug I33 swings the lever I31 outward against the pull of the spring I38 and permits the spring to pull the lever I35 into position to engage the notch I36 thereof with the shoulder I31 upon the lever |3| so as to hold the parts in this position.

The shaft I32 is thus oscillated in a direction to swing the line closing contact arm I42 away from the contact I44, as shown in Fig. 11, or the contacts MM and M41) as shown in Fig. 12, permitting said spring contacts to complete the connection with the telephone exchange. In the circuit shown in Fig. 11, this is done by permitting the spring contact I44 to contact with the other contact I45, thus completing the circuit to the telephone exchange from the line wire I41 through the wire I49, contacts I50 and I53, wire I54, reproducer 69, wire I55, contacts I44 and I45, wire I60, primary coil I51-and wire I56 to the line wire I48. After a moment to allow the connection to be completed at the central telephone exchange the break wheels 60 and 6| have rotated sufficiently, in the direction of the arrows shown in Fig. 11, to start the dialing.

' The tooth 98 of the central off-normal contact 95 drops off the high point I15 of the break wheel 60 just prior to the time that the tooth I5I of the dialing contact I50 drops off the high point I16 of the break wheel 6|. As the off-normal contact 95 is moved toward the break wheel 60 by this operation, it breaks contact with the contact 94 and closes the circuit through contact 96. The test phone I63, condenser I62 and secondary coil I59 are thus cut out of the circuit and the reproducer 69 is shunted out of the circuit and as the high points I11 upon the break wheel 60 are of less width than. the cor-. responding high points I18 which are located between the groups of teeth on the break Wheel 6|, both the test phone and reproducer are held out of the circuit during the dialing operation.

It should be kept in mind that immediately upon the starting of the apparatus the pin 55 carried by the dialing shaft 5| will have moved the Geneva wheel 56 sufficiently to permit the tooth 90' upon the arm 9| to drop into the notch 89 in the disk 80 carried by the Geneva wheel, thus rocking the shaft 92 in a direction to move the arm 93 out of engagement with the insulation block 99 upon the contact 95. As the dialing shaft 5| must make one complete revolution before the Geneva wheel 'is again moved; this arm 93 will remain out of the path of the contacts 95 and I50 during the complete dialing operation.

In the circuit shown in Fig. 12 the operation is cult by the line closing contacts and is held out of substantially the same excepting that the regular telephone instrument M6 is cut out of the cirthe circuit during the operation of the apparatus so that an attempt to usethe telephone ins-tru rnent Mt or the cutting of the wires thereto will not interfere with the operation of the apparatus. In this circuit, the movement of the arm M2, as above described moves the line closing contact i lfila away from the contact and into contact with the contact 6 15a. At the same time the contact MM?) is moved away from the contact Mob and into contact with the contact l liih. The telephone instrument M65 is thus cut out oil the circuit. The contacts M ld and Milo and idea and M51), respectively, are then momentarily opened and closed to restore the calling line lo l-N55 to normal; in case the local phone 366 is or has been busy.

The operation of the break wheels so and iii is then identically the same as described in con nection with Fig. ii, the test phone being out out of thecircuit and the reproducer shunted out of the circuit during the dialing of the number. in this manner the apparatus is automatically connected with the police headquarters or other station desired.

The next movement of the Geneva wheel causes the tooth till upon the arm iii to ride out of the notch til in the disk 83 and onto the pe riphery of said disk swinging the arm 3, through the shaft i922, back to its normal position, moving the oil-normal contacts and dialing contacts back to the initial position, as shown in Figs. 11 and 12 so that further operation of the break; wheels to and iii does not operate these contacts.

A short time after the telephone number has been rung, giving sufficient time permit some one at police headquarters to answer the tele phone, the Geneva wheel 56 wil'i have been moved sufiiciently to move the cam thereon out of the path of the roller upon the arm permitting the weight of the arm "i5 and the reproducezwhich is carried thereon, to swing the arm downward upon its pivot causing roller i l on the arm "it, which carries the reproducer, to ride downward upon the thus forwardly in clined arm iii so'that the needle ill or" the re producer til contacts with the record near the peripheral portion thereof, as usual and ordi= nary practice in the operation oi? phonographs.

The continued rotation of the upon the record shaft causes the message thereon to he transmitted through. the reproducer to the telephone at police headquarters. It w ll he understood, of course, that when @ilhas moved the contacts and Teach; to the nor-- mal position, the reproducer is again placed in the circuit so that the message is therefrom.

As the reproducer is moved inward to end of the record, the Geneva wheel will have one complete revolution, bringing it to the position shown in Fig. c of the cam ill! engaging the roller upon the Gil, and through the link 82 and. arm 8d, the arm :15 will be rocked hack to the position shown in Fig. 3, the roller i l upon the reproducer iii rolling bacl; to the position shown in iilg= ure, thus lifting the reproducer oil record carrying it hacl; to the starting position.

I Substantially at the same time the lug M0 on the underside oi the Geneva wheel will pass over the cam end Mil oi the arm i539, rocking theshait 136 and through it the arm in a direction to cocaine return the lever lili to the position shown in i. This movement of the lever iSi, through the shaft rocks the lever M2 baclr to the position shown Ming. 1, breaking the contact be tween i ila and Mia and making the contact lietween hide and lot, breaking the line connection to the telephone circuit.

Zlrnrneoliatelyaiter this, the cam lug i353 engages the lever lo l, moving the same as described in the beginning oi the operation, and swinging the lever M2 outward so as to permit the spring contact i lla to again close the line through the contact itlia. The line is again closed to the telephone exchange and the number again dialed as above described, after which the reproducer is lowered upon the record and the message again delivered to police headquarters, after which the reproducer is again raised irom the record and returned to normal position, and the line closing contacts are again opened, all as alcove described. V

This may be repeated any desired number oi times, thus placing several repeated calls to police headquarters and delivering the message each time, this being for the purpose of assuring the delivery of a telephone message to police headquarters. The apparatus as llustrated adapted to maize four separate calls to police headquarters or any other station desired in this man er.

At the end oi the fourth repetition oi the message to police headquarters, the dish 35 has reached the position shotm. in Fig. t, the notch L G therein registering with the angular lug d3 upon the arm 35. At this point the pallet the spring upon. the arm pulls the arm 33 against the out-er side of the drive pawl swing ing the same inward and disengaging the depend ing lug thereon from the lug 32 upon the drive dish ill. The lug 33 then enters the notch 2 in the stop l and the lug 36 drops into position as shown in -g. 8, engaging the shoulder the driving stopping the rotation Slice shaft is recited by the movement of the arm and rocks arm 6% to the right as viewed in i into the path of the lug upon the friction sleeve 1182 which is into frictional contact the friction dish i233 upon the motor shait id. stops the motor from coasting, the circuit to the motor ha"- -ng, of co "so, already been broken by the swinging or" the idd upon the shaft in order to reset the to place it in col..-

to he a tomatically operated again, the reset lever i is operated, the slide as ahcve descrioed.

initiating device and circuit which auto matically starts the transmitting mocha raisin in operation icy approach of a criminal to any protected point, as well as the inhibiting which an authorized person to approach such points without initiating the are illustrated in Figs. l4 to it inclusive, the complete circuits for the initiatini and inhilo iting devices being shown diagraroroaticohv in llne A. G. lit volt supply lines and E93 lead to opposite of the primary winding i851 oi a indicated generally at iili and pro vided with three secondary windings indicated at 882, 638 and i836. Wires lead from opposite 671% of the volt secondary vninding 183 to the plates E86 of a rectifier tuhe iS'i which is used to change this voltage current from A. C. to

- D. C. rectified current.

It should be understood that a local battery may be used to supply the proper current, thus eliminating the transformer and rectifier tube and substituting a D. C. amplifying tube in place of the A. C. amplifying tube I88 which will be later described. As the motor I3 could likewise be operated from the local battery, or by spring power if desired, the entire system could, if necessary, be operated by power contained within itself instead of depending upon an A. C. supply line.

The filament 889 of the rectifier tube is connected by wires l99 with opposite ends of the five volt secondary winding I83 of the transformer. In like manner the filament I9I of the amplifying tube M38 is connected by wires l92 with opposite ends of the two and one-half volt secondary winding I84 of the transformer.

A wire I93 leads from a center tap upon the 300 volt secondary winding I82 to the variable high resistances I94 and I95 of the B supply, the high yoltage then lea-ding through the wire I96 and high resistance I91 to the 13+ supply I99 which is connected by a wire I98 with a center tap of the five volt secondary winding I83 of the transformer. A positive current is thus passed through the B+ supply I99, by the wire 209 tothe spaced contacts 20I of the inhibiting means floor pad 202 located adjacent to the cash drawer, cash registeig safe, vault or other place to be protected which is indicated generally at 293.

A C- bias from the variable arm 204 of the resistance I94 supplies a negative current, by way of the wire 205, through the high resistance 206 to the, grid 291 of the amplifying tube I88. The plate 209 of this tube is connected through the wire 2 I 0. to the windings 2I I of the initiating relay and through the wire 212 and contacts 2I3 and 2 of the inhibiting relay 2I5 to the B+ supply I99.

The negative charge allows a minimum flow of plate current through the tube I88 and the plate circuit being connected, as above described, to the initiating relay 2I I, the same is held inoperative. The grid 201 of the amplifying tube is connected as by the wire 2I6 with the cash drawer or other point to be protected indicated at 203.

The floor pad 2021s provided with another series of spaced contacts 2I1 similar to the contacts 2H and spaced therefrom and connected to a wire 2I8 which leads to the terminal 2I9 of the employees dial device indicated generally at 220. This device is housed in an insulation casing as shown in Fig. 16 and the central rotatable shaft 22I is provided with a knob 222 for manually rotating the same and provided with a pointer 223 adapted to be turned to any of the numer als located around the face of the dial and shown in this instance as running from naught to 12. These numerals correspond in position with contact studs 224 located within the insulation housing 220 and adapted to be selectively engaged by the conductor arm 225 carried by the rotatable shaft 22I which is electrically connected to the terminal 2I8.

A 0011 spring 226 is adapted to normally return the arm 225 to a neutral position in contact with a stud 221, the arm being adapted to be temporarily held in contact with the proper one of the contact studs 224 when the magnet 228 is energized as will be later described. One end of the magnet coil is connected to the terminal 2I9, the other end being connected to a terminal 229 which is connected by a wire 230 with the negative side of the battery 23I, with the contact 232 of the inhibiting relay 2I5, and with the winding of said relay.

A managers dial, somewhat similar to the employees dial, may be located in connection therewith or at some remote point more convenient for the setting of the same and may comprise an insulation housing 233 having a dial such as ZZIl/chereon, provided with a plurality of numerals corresponding to the numerals upon the employees dial, a central rotatable shaft 234 being journaled therethrough and provided with an operating knob 235 and an indicating point 236 thereon. This shaft 234 is connected by a termi- -nal 231 to a wire 238 leading to the winding of the inhibiting relay 2I5.

A plurality of contact-studs 239. corresponding to the numerals upon the dial, are located within the housing 233 and adapted to be selectively engaged by the conductor arm 24f! carried by the rotatable shaft 234. Each of the contacts 239 of the managers dial is connected by a wire 241 with one of the contacts 224 of the employees dial.

.- In making this connection between the two dials, the wiring may be varied so that in no two sets would the setting number be alike. For example, the dials shown in Fig. 14 are connected in such manner that when the managers dial is set at the employees dial must be set at 6, thereby completing the circuit through both dials and holding the circuit as long as the connection is closed to'the magnet 228. It should be understood that no magnet or spring is provided in the managers dial, the conductor arm 240 being frictionally held in contact with any desired contact stud 239.

In order to prevent tampering with the managers dial by any unauthorized person, a locked cover 242 may be provided to normally cover the dial and operating knob 235 thereof.

Normally the parts would be in the position shown in Fig. 14 with the exception that the arm 225 of the employees dial would be held against the stud 221 by means of the coil spring 225, the circuit between the two dials being broken.

When the employee or other authorized person desires to have access to the cash drawer or the like indicated at 293, he must first have the sole or heel of his shoe properly prepared as by the provision of a metal plate or the like to make contact between the contacts 20I and 2I1 in the floor pad 202. The employee places his foot on the floor pad. This closes the circuit from the B+ supply I99 through the wire 200, floor pad contacts 20I and 2I1, wire 2I8 and terminal 2I9 through the magnet 228, terminal 229, wire 230, battery 23I and wire 2I0 energizing the magnet 228.

The employee, having been previously in structed as to the proper setting for the employees dial, moves the indicator to the proper position, which in this case would be the contact 6, the magnet holding the arm 225 in this position. This completes the inhibiting circuit from the B+ supply I99, through the wire 200, floor pad contacts 2M and 2I1, wire 2 I8, terminal 2I9, arm 225 and contact 6 of the employees dial, through the proper'wire 24I to the contact 5 of the managers dial, through the arm 240 and terminal 231 thereof, wire 238, inhibiting relay 2I5, wire 230, battery 23I and back through the ilfd wire energizingv the inhibiting relay 5 which breaks the contact between and 2M and closes the contact between M3 and thus breaking the circuit to the coil 2i l of the initiating relay and preventing the contacts ltll and Mill from closing. The closing of the contacts 263 and 232 also closes a depolarizing circuit from the battery 23!] through the coil til of the initiating relay, coming from the positive side of the battery through the wire 2 ill, coil 25 l, wire 2M2, contacts M3 and 232 and, wire 2% to the negative side of the battery-231i The employee may thus safely handle the cash drawer Ella and the like while standing upon the floor pad with the specially prepared shoe or shoes and by setting the employees dial at the proper position which has been previously given to him by the manager or other authorized person in charge of the setting of the managers dial, Without danger of initiating the operation of the alarm transmitting apparatus.

It should be understood that the setting of the dials may be varied as often as desired, to prevent knowledge of the same from being used by an unauthorized person such as a burglar or an employee who has been dismissed.

Should an unauthorized person, without having his shoe or shoes properly prepared to make contact across the door pad, and without knowing the proper setting for the employees dial, ap-

proach the cash drawer or the like shown at tilt and touch the same, contact is made from the floor pad to the cash drawer through the body of the person connecting a circuit between these two points and allowing the current to flow from the L supply l through the wire Ellll to the floor pad contacts till, through the body of the person to the cash drawer 2% and from there by the. wire Bill to the grid fill of the tube Elli.

in this manner a positive current opposes the C bias current already imposed upon this grid,

and is of suiiicient strength to change the condition of this grid from a negative to a positive charge. This permits excess flow of current through the plate circuit by way of the wire Zilll,

, contacts 2M and Elli, wire 22512 and through the Gill initiating relay 2M and back through the wire lid, actuating the initiating relay and closing the contacts llll and. Hill) which closes the motor circuit and starts the alarm transmitting apparatus in the manner above described in detail. The B-}- line ground to the door is sidrlciently sensitive that should the unauthorized person be standing away from the pad at any point within reach of the valuables; the same circuit would be completed from the floor and through his body to the cash drawer asabove described.

Should an employee while standing upon the floor pad and handling the money or other valuables protected in the cash drawer, be held upfhe can instantly, by a slight movement of his foot from the floor'pad, which would be unnoticed hy the criminal, break the circuit to the magnet 2228 in the employees dial, permitting thecoil spring to throw the arm to the neutral position, thus instantly and silently, without any show of resistance upon the part of the employee, restoring the protection of the device to the valuablesin the cash so that should the, employee, robber or any other person touch the cash drawer, the alarm would be instantly initiated in a silent and undetectable mannerand' be transmitted in the form an oral over the telephone sysaooaics tern, direct to the police department, radio cruiser or other authorized location.

From the above it will be seen that the entire assembly as illustrated and described comprises a number of component parts all working t0- gether to constitute a single means for causing the apprehension of a burglar without his knowledge of the same by any visible or audible signs, or any disobedience to his commands that would warn him that an alarm has been given. When an unauthorized person attempts'to remove or even touches the valuables thus protected, he instantly completes the circuit as above described, closing the contacts iiil and W8 and starting the operation of the alarm transmitting apparatus.

The burglar thus, without any knowledge that he has done so, starts the silent transmission of 1 a message over the system shown in Fig. 18. In

this figure the various parts are indicated only diagrammatically but it will be seen that through the initiating device shown at A, the silently operating alarm transmitting apparatus, indicated generally at B, is operated to prepare the line by the off-normal contacts above described and then close the circuit "indicated generally at C, to the automatic telephone exchange indicated 1 at D, the telephone number of police headquarters being dialed as above described; cansing the automatic telephone exchange, through the interconnecting linkstherein, to connect the calling circuit C with the called circuit E leading to the instrument F at police headquarters, the record then operating as above described to silently transmit the spoken message from the alarm transmitting apparatus to the police telephone instrument F. The police telephone F may be connected to a radio broadcasting apparatus, indicated generally at G, which will broad cast the message directly to radio equipped police cars or airplanes, as indicated at H and I respectively. while the burglar is in the very act of committing a robbery, he has, by means which are inaudible and imperceptible to caused the transmission of a message advising of the commission of the crime to a radio equipped police cruiser which may be in the vicinity of the crime at the time.

I claim: l

1. In combination with a telephone circuit, alarm transmitt ng apparatus including means for automatically delivering a predetermined niesage over the telephone circuit, an initiating device for automatically starting the operation oi said alarm transmitting apparatus by the presence of a person at a given oint, and inhibiting means including a circuit normally open at said given point and a conductor on the shoe of an "authorized person for closing said circuit perrnitting an authorized person toapproach said given point without operating said initiating device.

2. In combination with a telephone circuit,

alarm transmitting apparatus including means 7 for till acea ss alarm transmitting apparatus including means for automatically delivering a predetermined message over the telephone circuit, an initiating device for automatically starting the operation of said alarm transmitting apparatus by the presence of a person at a given point, and inhibiting means including a circuit normally open at said given point and a conductor on the shoe of an authorized person for closing said circuit rendering said initiating device inoperative by the mere presence of an authorized person at said given point.

4. In combination with a telephone circuit, alarm transmitting apparatus including means silent at the point of inception for automatically delivering a predetermined message over the telephone circuit, an initiating device for automatically starting the operation of said alarm transmitting apparatus, and a circuit to said initiating device normally open at a given point and adapted to be closed through the body of a person approachingsaid given point, and means carried by an authorized person for preventing the closing of said circuit when such authorized person is at said given point,

5. In combination with a telephone circuit, alarm transmitting apparatus including means for automatically delivering a predetermined message over the telephone circuit, an initiating device for automatically starting the operation or" said alarm transmitting apparatus, a circuit to said initiating device normally open at a given point and adapted to be closed through the body or" a person approaching said given point, and in-= hibiting means including a second circuit normally open at said given point and a conductor on the shoe of an authorized person for closing said last named circuit and preventing the closing of said first named circuit through the body of an authorized person approaching said given point.

6. In combination with a telephone circuit, alarm transmitting apparatus including means for automatically delivering a predetermined message over said telephone circuit, an initiating device for starting the operation of said alarm transmitting apparatus, a circuit to the initiating device, means for normally supplying a minimum flow of current through said circuit whereby the initiating device normally remains inoperative, and means whereby the presence of a person at a given point Will cause an excess flow of current through the circuit to operate the initiating device. I

11in combination with a telephone circuit, alarm transmitting apparatus including means tor automatically delivering a predetermined message over said telephone circuit, an initiating device for starting the operation of said alarm transmitting apparatus, a circuit to the initiating de ice, means for normally supplying a minimum flow of current through said circuit whereby the initiating device normally remains inoperative, means whereby the. contact of a person ata given point Will cause an excess flow of current through the circuit to operate the initiating device, and inhibiting means including contacting means carried by an authorized person at said given point to prevent said excess flow of current to the initiating means,

8. In combination with a telephone circuit, alarm transmitting apparatus including silently operating means for automatically delivering a predetermined oral message over the telephone circuit, an imperceptible silent initiating device and means 101' automatically starting the operation of said alarm transmitting apparatus by the mere presence of a person at a given point.

9.1m combination with a telephone circuit, alarm transmitting apparatus including silently operating means for automatically delivering a predetermined oral message over the telephone circuit, an imperceptible silent initiating device for automatically starting the operation of said alarm transmitting apparatus by the presence of a person at a given point, and inhibiting means including a circuit normally open at said given point and a conductor on the shoe of an authorized person for closing said circuit for rendering the initiating device inoperative by the mere presence of an authorized person at said given point.

10. In an automatic telephone exhange, a crime alarm comprising an alarm signal at a police station, a called line connecting said alarm with the automatic exchange, a guarded station, a calling line leading from the guarded station to the automatic exchange automatically operating connecting links for uniting the calling and the called lines to transmit an alarm, means at the guarded station for detecting the presence of a person at the guarded point, a number transmitting device adapted to operate the automatic apparatus for linking the calling with the called line, and a starting device for the number transmitting device operated by said means for de tecting the presence of a person at the guarded point.

11. In a crime announcing system for automatic telephone exchanges in combination a called line from the automatic exchange to a police station, a receiving instrument connected with line at the police station adapted for receiving spoken messages, a guarded station, a calling line leading from the guarded station to the automatic exchange, a number transmitter at the guarded station for operating the link apparatus in the automatic exchange to connect the sailing with the called line, an inaudible spo, en message transmitter, means at the guarded point adapted for detecting the bodily presence of person, a number transmitter, a starting device for said number transmitter operated by said detecting device and for connecting the spoken messag transmitter with the called telephone line.

12. In a crime detecting system for an automatic telephone exchange, a telephone line leading from the exchange to a police station and a spoken message receiver of the line at the police station, a guarded station, a calling line leading from the guarded station to the autcmatic exchange, interconnecting links in the automatic exchange for uniting the calling with the called line, an inaudible number transmitter at the guarded station for operating the automatic exchange linking, an inaudible spoken message transmitter at the guarded station, detecting means for detecting the bodily presence of a person said detecting means being imperceptible to the person, a starting device for the number transmitter operated thereby and a. starting device for the message transmitter, whereby a spoken alarm message is transmitted to the police station through the automatic telephone exchange by the mere bodily presence of an unauthorized person at the guarded station imperceptibly to the person.

13. In an automatic silent alarm transmitting system for automatic telephone exchanges, in combination a telephone circuit extending from the automatic exchange to 9. called telephone;

station and a spoken message receiver of the circuit at, the said station, a guarded station, a

. calling line from the guarded station to the automatic exchange, linking apparatus in theexchange for connecting the calling with the called line, an electrical detecting device at the guarded point for electrically detecting the presence of an unauthorized person, an inhibiting device for preventing the operation of the said detecting device, said inhibiting device including contacting means carried by an authorized person, an inaudible number transmitter at the guarded station connected with the line for operating the automatic exchange links to unite the calling with the called circuit, an inaudible spoken mes sage transmitter at the guarded station for transmitting a spoken message to the called station, a starting device for the number transmitter operable by said electrical detecting means, and means for putting the spoken message transmitter into operation after the operation of the number transmitter whereby the presenceof an unauthorized person only at the guarded point is caused to transmit imperceptibly and inaudibly to him a spoken alarm message to the called station.

l4.l[n combination with a telephone circuit, apparatus including means for automatically closing said telephone circuit, means for then momentarily opening and again closing the circuit, ofi-normal contacts in the telephone circuit, means for automatically operating said off-normal contacts after the circuit has been finally closed, means for automatically dialing a predetermined telephone number after the ofl-normal contacts have been operated, means for returning the off-normal contacts to normal position after the dialing operation, a message record, means for operating said record, an automatic telephone transmitter in the circuit, and means for operatively associating the transmitter with the record after the return of the off-normal contacts to normal position.

15. In combination with a telephone circuit, apparatus including means for automatically closing said telephone circuit, means for then momentarily opening and again closing the circuit, ofi-normal contacts in the telephone circuit, means for automatically operating said off-normal contacts after the circuit has been finally closed, means for automatically dialing a predetermined telephone number after the offnormal contacts have been operated, means for returning the cit-normal contacts to normal position after the dialing operation, a message record, means for operating said record, an automatic telephone transmitter in the circuit, means for shunting the transmitter out of the circuit during the dialing operation, and means for oneratively associating the transmitter with the record after the return of the ofi-normal contacts to normal position.

16. In combination with a telephone circuit,

mally open at said given point and a conductor on the shoe of an authorized person for closing said circuit permitting an authorized person to approach said given point without operating said initiating device, and means whereby acetates the authorized person may render the inhibiting means inoperative.

,i'i. In combination with a telephone circuit, alarm transmitting apparatus including silently operating means for automatically delivering a predetermined message over the telephone circuit, an initiating device for automatically starting the operation of said alarm transmitting apparatus by the. presence of a person at a given point, and inhibiting means including a manu ally operable switch dial whereby an authorized person may approach said given point without operating said initiating device, and means for holding the switch dial operative during the presence of an authorized person.

18. in combination with a telephone circuit, alarm transmitting apparatus including silently operating means for automatically delivering a predetermined message over the telephone circuit, an initiating device for automatically start ing the operation of said alarm transmitting apparatus by the presence of a person at a given point, inhibiting means including a manually operable switch dial whereby an authorized person may approach said given point without op= erating said initiating device, means for automatically holding said switch dial in operative position While the authorized person remans at said given point, and means for automatically when the authorized person leaves said given point.

19. In combination with a telephone circuit, alarm transmitting apparatus including silently operating means for automatically delivering a predetermined message over the telephone circuit, an initiating device for automatically starting the operation of said alarm transmitting apparatus by the presence oi a person at a given point, inhibiting means including a floor pad at i said given point having spaced electric contacts therein, a normally open circuit connected to said spaced contacts, and an electrical conductor adapted to be placed upon the shoe of an authorized person for closing said circuit through said spaced contacts when the authorized person stands upon said floor pad.

20. In combination with a telephone circuit, alarm transmitting apparatus including silently operating means for automatically delivering a predetermined message over the telephone circuit, an initiating device for automatically start= ing the operation of said alarm transmitting ap paratus by the presence oi a person at a given point, inhibiting means including a floor pad at said given point having spaced electric contacts therein, a normally open circuit connected to said spaced contacts, a manually operable switch dial in said circuit, and an electrical conductor adapted to be placed upon the shoe of an authorized person for closing said circuit through said spaced contacts when the authorized person stands upon said floor pad.

returning the switch dial to neutral position 21. The method of protecting valuables which audible at the point of reception by the mere presence of a person at a certain location in the vicinity of said valuables, and means carried by an authorized person for inhibiting the transmission of said message by the mere presence of such authorized person at said location in the vicinity of said valuables.

23. In combination with an automatic exchange telephone line, an alarm system. comprising, a protective circuit, a motor means responsive to the disturbance of said circuit for starting the motor, a phonographic device operated thereby and having an electrical output path adapted to send an alarm message over said line impulsing means for automatically connecting said line to a particular station, said impulsing means being operative to short circuit said output path during station selection, thereby to prevent false dialing impulses and to thereafter remove said short circuit for transmission of the alarm message, and means automatically opening said output path following transmission of said message thereby to release said station and terminate the 10 alarm.

RALPH W. CARNAHAN.

Images