US2204420A - Alarm system - Google Patents

Description

June l1, 1940- R. D. LlGHTFooT 2,204,420

l ALARM SYSTEM Filed July ll, 1959 3 Sheets-Sheet 1 ATTORNEY5 June ll, 1940. R. D. LIGHTFooT 2,204,420

Y ALARM SYSTEM Filed July ll, 1959 5 Sheets-Sheet 2 'J ATTO R N EY June 1l, 1940. Rl L [GHTFOOT 2,204,420-

ALARM SYSTEM Y Filed July ll, 1959 5 Sheets-Sheet 5 ATTORNEYS l Patented June 11, 1940 UNITED STATES PATENT l OFFICE ALARM SYSTEM Richard D. Lightfoot, Great Neck, N. Y., assignor Y to Sig-naphone Corporation of America, New York, N. Y., a corporation of Delaware Application July 11, 1939, Serial No. 283,839

. 9 claims.l (cl. 17e-Q5) This invention relates to alarm systems and more particularly to-a novel alarm system which may be used for the protection of two or more areas with but a single, central message-transmitting apparatus and which is operable from any one of the protected areas to transmit from the central apparatus both a coded and a telephonic alarm message indicating the location of the area. The new system is reliable in 0p- 10 eration and affords protection at a lower cost per unit of protected area than prior telephonie alarm systems.

Alarm systems of various forms have been devised heretofore for transmitting-alarm Inessages to a central station from any onev of la number of protected areas. One alarm system of this type operates in conjunction with a telephone line to transmit an alarm message telephonically to the central station. These sys- 2Q tems generally include a message transmitting apparatus located on the protected premises and connected to the subscribers telephone line, usually through a control switch. When an emergency occurs on the premises, the transmitting .25 mechanism is automatically started and closes the control switch so as to connect the mechanism directly into the telephone line. The transmitting mechanism then signals the central exchange or dials a predetermined station, depend- 30 ing on the type of equipment at the central exy change, and transmits over the line a recorded telephonic alarm message which gives the location of the premises. Alarm systems -of` this form are expensive for the reason that each sub- 35 scriber requires a separate message-transmitting mechanism which includes a large number of parts, such as a motor, a dialing device,.a

phonograph pick-up and various control elements, and is therefore expensive to manufac- 40 ture. Also, there is danger that several messagetransmitting mechanisms may be started at about the same time, sothat one or morey of them will, have `completed its transmitting cycle before it can be connected to the central ex- 45 change, wherebyits alarm message will vnot be,

received.

In my copending application Ser. No. 217,273, 'led July 2, 1938, of .which this application is a continuation-impart, I havey disclosed a tele-AA phonic alarm system which overcomes these disadvantages and is adapted to accommodate a large number of protected areas with Aonly asingle message-transmitting apparatus. The system there shown comprises aplurality of phono- 55 graph records, one for each protected area, each record havingan alarm message recordedthereon for indicating the location of the respectivey Each of the protected areas is providedy area. with an alarm circuit connected to a selector in a transmitting station, and when oney of the circuits is affected, Ait causes the selector to move the corresponding record to a pick-up common to all of the records which transmits the mes.- sage telephonically to a central receiver. For

'some purposes, it is desirable to obtain apermatem which provides a permanent record of eachv telephonic alarm message received at the central receiving station. The mechanism by which this record is obtained is simple and inexpensive and may bevmounted in p-art on the'telephonic alarm-transmitting mechanism. v

According `to `the present invention, a code transmittery is connected in the telephonie alarm circuit between the pick-up and the receiving station or in a separate line extending to the receiving stationv and is operable by a plurality of impulse devices, one for each record. When any one of the records is moved by the selector into cooperative relation with the pick-up, the

corresponding impulse device is moved relative to the code transmitter so as to operate the latter and initiate lcurrent impulses at the receiving l station. These impulses operate a suitable recording device which marks on a tape, or the like, a coded identication of the record which has been selected rto send a message. The impulse device may then be rendered inoperative and the record causedV to operate on the pick-up and send a telephonicalarm message to the receiving station informing the attendant verbally of the location of the emergency. It Will be understood that the sequence of operations may be reversed, if desired, so that the code transmitter operates the recording device after the telephonie alarm has been received. y

The new system thus provides a permanent record of the telephonie alarm messages received atfthe station, and thisrecord identifies in code the location of each area from which caused to actuate one of the contacts either by movement of the record into the transmitting position or by rotation of the record carrier, whereby current impulses of a predetermined sequence are created at the receiving station to operate the recording device.

For a better understanding of the invention, reference may be had to the accompanying drawings, in which Fig. 1 is a schematic view of one form of the new alarm system;

Fig. 2 is a side view, partly in section, of part of the selector shown in Fig. l;

Fig. 3 is a section on the line 3 3 in Fig. l;

Fig. 4 is an end view of part of the selector mechanism shown in Fig. 2;

Fig. 5 is an end View of another part of the selector mechanism;

Fig. 6 is a schematic view showing in detail the code transmittei^ and the pick-up illustrated in Fig. 1;

Fig. 7 is an end View of the code transmitter and the pick-up shown in Fig. 6, and

Fig. 8 is a plan View of one of the phonograph records.

The alarm system, as shown, comprises an electrical pick-up Il] including` a tone arm II carrying a reproducer or sound box I2 on which is mounted a needle I2 adapted to engage a phonograph record. The tone arm II is slidably mounted in a cylindrical support I3 in which it is loosely fitted, whereby the reproducer I2 may move up and down on the record due to irregularities thereof, without aifecting the support. Mounted on the reproducer I2 is a bracket I4 (Figs. 6 and 7) which carries near its lower end a pair of contact arms I5 and I6 forming part of a code transmitter. Each of the contact arms is provided with a contact I1, and these contacts are adapted to be engaged by movement of the lower arm I6 to be described. The reproducer I2 is connected to a telephonie transmission line including a wire I9 leading from one terminal of the reproducer through the support I3 to the contact arm I5. The other contact arm I6 is connected by a wire 25J to one terminal of a current source 2l, such as a battery, the other terminal of which is connected by a wire 22 to a terminal 23 located at a central receiving station. A branch connection leads from terminal 23 through a suitable receiving device 24, such as a pair of earphones, to a stationary Contact 25, and another branch connection leads from terminal 23 through a suitable recording device 26, such as an electromagnetic stylus coacting with a tape 21, to another fixed contact 2S. A switch arm 29 is movable selectively into engagement with one or the other of the contacts 25 and 28 but is normally urged against the contact 28 by a spring 30. The switch arm is connected by a wire 3I throughthe support I3 and the tone arm to the other terminal of the reproducer I2. A high resistance element 32 is included in the transmission line and is adapted to be shunted by the contacts I1.

Intermediate its ends, the support I3 is pivoted on a horizontal shaft 35 and is connected to a cam 36 which turns with the support on the shaft. Normally, the support I3 is held in a retracted, inoperative position, shown in dotted lines in Fig. 1, by a tension spring 31 connected at one end to the outer end of the support and fixed at its opposite end. The retracted position of the support and the tone arm is determined by a stop 31 against which the inner end of the support is urged by the tension spring. The reproducer assembly is movable from its retracted position to its operative position, shown in full lines in Fig. 1, by a rotatable member 38 connected to an electric motor 38 and having a finger 39 posi tioned to engage the inner end of support I3 during rotation of the member. That is, when the member 38 is driven by the motor, it moves the finger 39 clockwise into engagement with the support I3 and gradually elevates the inner end thereof to the position shown in full lines, whereupon the finger disengages the support. A lever 40 pivoted intermediate its ends is urged against the periphery of cam 36 by a tension spring 4I, and when the support I3 is moved by nger 39 to its operative position, the hooked end, of the lever is forced into a notch in the periphery of the cam and thereby holds the support against retraction by the spring 31.

The reproducer assembly III is located at a central transmitting station and cooperates with a plurality of phonograph records 44a to 44h, inclusive, mounted on" turn tables 45a to 45h, respectively. Each of the records has recorded thereon a message which indicates the location of an area to be protected, and while in the systemi' illustrated eight records are shown for use with a corresponding number of protected areas, it will be understood that any desired number of records may be employed, depending on the number of areas to be protected. Each record is provided near its periphery with a series of projections 46 which are spaced apart and form an impulsing means adapted to engage a lip I6 on the contact arm I6 when the record is in the transmitting position (Fig. 6). The spacing of the projections 46 on each record is diirerent from the spacing on the other records, so that the projections cause the contacts I1 to close and open in a predetermined sequence which identifies the record.

The records are adapted to be positioned selectively relative to the reproducing assembly I0 by a selector means which, as shown, comprises a carrier 41 provided with radially extending arms 41a to 41h, inclusive, on which the turn tables 45a to 45h, respectively, are mounted. The record carrier is rotatable on a horizontal shaft 48 journaled at its ends in bearings on a frame 49, and the shaft may be driven by a sprocket wheel 50 keyed to one end of the shaft and connected through a chain 5I to a sprocket wheel 52 driven by an electric motor 52'. Mounted on the shaft 48 adjacent the record carrier is a cam wheel 54 which turns with the carrier and is formed on its periphery with a series of semicircular indents 55 corresponding in number to the number of the turn tables. A support 56 adjacent the record carrier has an electric motor 51 pivoted thereon and adapted to swing about a horizontal axis parallel to the shaft 48. A horizontal arm 58 is connected to the motor and extends to a point adjacent the cam wheel 54, where it carries a vertical inger 59 having a curved end adapted to t in the indents 55. The motor 51 has a vertical drive shaft 60 provided on its upper end with a friction disk BI which may engage the periphery of and drive the adjacent turn table. The finger 59 is urged against the periphery of cam Wheel 54 by a leaf spring 62 mounted on the support 56 and bearing its free end against the motor 31.

'Ihe record carrier 46 is rotatable in a clockwise direction by motor 52', and when it rotates, the curved end of finger 59 is forced out of the indent lgagement with the table'.

55 against the action of leaf springv 62 and rides onto the periphery .of the cam wheel, whereby the friction disk 6l ismoved radially away from the turn table. As the next turn table comes into position adjacent the -reproducer assemb-ly, the finger 59 rides into the next indent 55 and allows the spring (i2-to force the disk 5l into driving en- Thus, the finger 59 serves to hold the krecord carrier against movement while the record is playing and controls movement of driving disk 4l into and out of engagement with the turn tables.

Mounted on the shaftr 48 'near one end of the record carrier isacontrol member or disk 64 made of insulating material and adapted to rotate with the shaft and the carrier; A `conducting member in the form of a metal ring 65 is disposed on the front face of the diskand secured thereto in any suitable manner. The peripheries of the ring and the disk are recessed to receive an insulating element 65, the front face of vwhich is flush with the front face of the ring. A brush 6l extends throughthe insulating element and is connected at its rear end throughxa Wire 58 to a slip ring 69 secured tothe rear `face of the disk. A b-rush 'l0 mounted on a standard 'F9' (Fig. 2) engages the slip-ring'andhas a wire 'll leading therefrom to a Wire 'l2 connected to one terminal of each of the motors 38and51. The

other terminals of thesemotors are connected by a wire 13 from which a wire 'I4 extends to the positivey terminal ofl a `current source Tl. A branch wire 'll' leads from wire 'll to one side of. the coil of a relay 'l5 for controlling a pair of'contacts 15, the other side of the= coil being connected to wire 14.

Opposite the rotatable'member 64 is a stationary control member V'I9 made of insulating matenected to a bimetallic Contact arm 84 controlling a pair of normally closed contacts 85a, the fixed y contactof which is connected through a wire 86a to a wire 8l leading to the negative side ofthe current source Tl. Similarly, the contact 80h .is connectedat its outer end through a wire 8lb to a movable contact arm 82h controlling a pair of normally open contacts 8312; the stationary Contact of which is connected to a bimetallic armv The arm 8419 operates one of a pair of normally closed contacts 85h, the other of which is` connected through a Wire 39h to the wire 81. The remaining contacts 69 to 69h, inclusive, are connected in a similar manner to line 81 through contacts 83C to 83h, and contacts 85e to 85h, re#

'.spectiVely, by suitable wiring, not shown.

A second slip-ring 88 is mounted on the back of disk 64 concentric with the slip ring and.

is connected by a wire 88 to the conducting ring 55. A. brush 89 mountedon standard 19" engages the slip ring V88 and is connectedby a .wire 90 to one ofthe Contacts 'l5 ofFrelay '15.The other contact 16 is connected `bywire 99 to-one ter'- minal of motor 52', the other terminal being connected through wire 9l to Wire 'll and the positive side of the current'source. The Wirel extends from the negative terminal of` thecur rent source to a contact arm 92 which is operable by a nger 93`mounted on =the rotatable member 3.8opposite thenger 39. lThe arm 92 operates onev ofy a pairiof contacts 94, the other of which is connected'by a wire 95 to the wire 99.

The contacts 83a and 85am? the selector are controlled by an .alarmcircuit including a pair of contacts9'la located ona premises A which is remote from thev transmitting station. The contacts 91a are adapted to be'closed and remain closed when an 4emergency occurs at the 'premises, and one of the contactsis connectedby a1 wire 98a to the' positive terminal of a current source 99 situated at the transmitting station,-- and the other contact is connected through wire lllllato the coil of a heating device l lal adjacent the bimetallic arm 84o. The heating device and the bimetallic arm constitute jointly a'time-delay switch Which opens the contacts 85a after a predetermined time interval following the energizing of the heating device. From the heating device lllla, the Wire Alilct` extends to thecoil llla of a relay `for controlling the contacts 83a, and from the coil |020. to the negative sideof current source 99. The contacts 83h and 85h are controlled by a similar circuit including a pair of contacts 91h located at a'distant premises B to be protected, one of thecontacts being connected through a wire 9811 to the positive side of the current source 99, and the other contact being connected through a wire 109D' to thel coil of a heating dee vice llllhadjacent the birnetallic contact arm 94h. From the heating device llb, the Wire lllllbA extends'to the coil l02b of a relay for controlling contact 83h, and from the coil to the`.negative side of current source` 99. Preferably, resistances lll3a and l03b are connected across wires 98a, llllla and 98h, ll'lllbl, respectively, in parallel with the contacts 9'lafand 97h. The other contacts 83e to 83h andy 85o to 85h, inclusive, are controlled byv similar vcircuits (not shown) extending to other premises to be protected.

Normally,the contacts on the protected prem- Vises are open andthe current supplied from current source 99 through resistances l'3a, ll'l3b', etc., to the coils Bla andZa, lilo and 82h, etc., is insufficient to actuate the respective contacts 83a and 95a, 83h and ,85byetcpv Accordingly, all of the contactsa to 83h, are normallyfopen and all of the contacts 85a to 85h are normally closed. f

Although contacts 19 are normally closed, the motor 52 cannot be energized because the cone ducting ring 65 connected 'through thesefcontacts and the motor 52 to the positive side of current'source 1'! does not havea connection through any of the contacts 33a to 83h, inclusive, to the negative side 'of the current source. Also, the motor 52 cannot be energized through'the circuit including Wires 8l and 95, since the contacts 94 controlling the latter circuit are normally open. When the system is idle, the insulator 58 and brush 'l'are not engaged by any ofthe contactsv 89a to 89h, and all of the latter contacts' engage the conducting ring 55.

Assuming ythat an emergency occurs at thel `v`mally closed contacts 16, wire 90, brush 89, slip ring 83, wire A88', vconducting ring 65, contact This circuit is d, wire Bla, arm 82a, contacts 83a and 85a, and wires 86a and 81 to the negative side of the current source. The motor 52 then commences to drive shaft 48 and turn the record carrier 46 and the insulating disk 64 in a clockwise direction, whereby the conducting ring 65 and insulator 66 are moved over the contacts 80a to 80h, inclusive. When the insulator 66 rides onto the conductor 89a, the circuit previously traced through motor 5?. is broken and another circuit is established which is traceable from the positive side of current source 11 through the coil of relay 15, wires 1| and 1|, brush 10, slip ring 69, wire 68, brush 61, contact 80a, wire Bla, contacts 83aV and a, and wires 86a and 81 to the negative side of the current source. The relay 15 is thus energized so as to open contacts 16 and prevent subsequent energizing of motor 52 through any of the contacts 83a to 8371, inclusive. When the insulating element 66 engages contact 80a. causing motor 52 to stop, the record 44a on the carrier 46 is adjacent the reproducer assembly l0, as shown in Fig. l, where it remains during the subsequent transmitting cycle to be described.

At the instant the motor 52 is deenergized, the motors 38 and 51 are energized through a circuit traceable from the positive side of current source 11 through wires 14 and 13, parallel connected motors 38 and 51, wires 12 and 1|, brushes 10 and 61, contact 80a, contacts 83a and 85a, to the negative side of the curr-ent source, whereby motor 51 rotates the turn table 45a, and motor A38 rotates the wheel 38. As the latter rotates, the finger 39 thereon moves the reproducer i2 downwardly until the needle rests on the record 44a, whereupon the lever 40 moves into the notch in cam 36 and holds the reproducer in its operative position. The needle I2 initially engages an annular zone |06 on the record which is disposed just inwardly from the series of projections 46, whereby the lip I6' on the lower arm i6 is in position to be engaged by these projections. The zone |06 does not have any part of the message recorded thereon but is made up of a groove in which the needle rides toward an inner zone |01 on which the alarm message is recorded. Accordingly, as the record rotates, the projections 46 successively engage the lip I6 and thereby cause the contacts |1 to close and open in a predetermined sequence, as, for eX- ample, the sequence 4-3-2-4 with the record shown in Fig. 8.

Each time the contacts I1 close, the resistance 32 is short-circuited, thereby causing a current surge through the transmission circuit traceable from the battery 2| through wire 22, terminal 23, the recording device 26, contact 28, switch arm 29, wire 3|, the reproducer I2, wire |9, contacts |1, and wire 20 back to the other terminal of the battery 2|. This current surge operates the recording device 26 and causes the latter to make a mark on the tape 21 which moves continuously near the stylus of the recorder. Thus, with the record shown in Fig. 8, the recorder produces marks on the tape 21 in the sequence 43-24, which when decoded show that the record 44a has been selected to send a telephonie alarm. After t-he coded message has been inscribed on the tape 21, the operator moves the switch arm 29 away from contact 28 into engagement with contact 25. When the needle I2' moves to the inner portion of the zone |06, the lip |6 on the contact arm I6 is moved out of line with the projections 46, and thereafter the needle moves over the zone |01 and causes a teleph'onicfalarmto be transmitted over the alarm circuit traceable from battery 2| through wire 22, terminal 23, receiver 24, contact 25, switch arm 29, wire 3|, reproducer |2, wire |9, resistance 32, and wire 20 to the other side of the battery. The operator at the receiving station is thus informed verbally of the location of the premises A.

The relative speeds` of the motors 38 and 51 are such that the rotatable member 38 is turned substantially one revolution during the code sending operation and the playing of the record. Thus, when the transmitting cycle has been transmitted, the finger 39 engages the inner end of lever 40 and trips the lever, thereby permitting the tone arm to move upwardly to its inoperative position under the action of spring 31. Simultaneously, the finger 93 on the member 38 engages contact arm 92 and closes contacts 94, thereby establishing a circuit traceable from the positive side of current source 11 through wire 9|, motor 52', wires 90 and 95, contacts 94, and wire 81 to the negative side of the current source. The motor 52' is then re-energized and rotates the record carrier and disk 64 until brush 61 moves off the contact 80a, whereupon the circuits previously traced through relay 15, motors 38 and 51, and contact 80 are broken. Although the motors 38 and 51 are de-energized as soon as brush 61 disengages contact 80a, the motor 38 thereafter has suicient momentum to move the finger 93 off the contact arm 92, whereupon contacts 94 are opened and motor 52 is deenergized. The rotatable member 38 is thus restored to its initial position with the iinger 93 slightly beyond the lower arm of 92, and the linger 39 between the inner ends of lever 40 and the support |3. -When the support tracted by spring 31, the tone arm swings by gravity back to its initial position over the outer zone |06 of the record.

After completion of this transmitting cycle and the lapse of a certain time interval to be transcribed in detail presently, the bimetallic arm 84a is heated sufhciently by the heating device |0|a to bow and disengage contacts 85a, whereby the contacts 83a cannot affect the record selector until the contacts 91a are reset manually. It will be apparent that when brush 61 moves off contact 80a and de-energizes relay 15, the contacts 16 close so as to permit energizing of motor 52' through any of the other contacts 83h to 83h, inclusive.

When the contacts 91h are operated at the premises B, the contacts 83h are closed in a similar manner so as to energize motor 52 and cause the latter to rotate the record carrier and disk 64 until the insulator 66 and brush 61 ride onto the contact 80h. The motor 52 is then de-energized and -the carrier stops with the record 441) adjacent the reproducer l2 and the contacts 1. At the same time, the motors 51 and 38 are energized through brush 61, contact 8017 and contacts 8317, whereby the record 44b is rotated causing the contact |1 to be closed and opened in a predetermined sequence by the projections 46. As a result, the recording device 26 produces marks on the tape 21 of a predetermined sequence, which, when decoded, indicate that the record 44h has been selected to send a telephonie alarm message. When the message on record 44h has been transmitted telephonically, the motor 52 is started again to move brush 61 off contact 80h and de-energize motors 38 and 51, after which the motor 52 is stopped by the breaking Cil lcycle is in'progress.v `If several alarm circuits time, the motor 52 will be energized throughthose contactsV 83a, 83h, etc., corresponding to the'operated alarm circuits and `will turnthe record rcarrier and disk 64 until thebrush 61 rides onto the first energized contact llayetc., in its path, that is, the first contact which-is connected to the negativeside of current source 11 through apair of closed contacts 83a., etc. Upon closing ofcontactsfl after completion of the subsequent message-transmitting cycle, the motor 52 is re-energized through one ofthe other pairs of closed contacts 83a, etc., andthe record carrier and disk 64 are rotated until brush S1 moves onto the next energized contact 80a, etc., whereupon the transmitting cycle is repeated with the corresponding* phonograph rec-r ord acting on the lreproducer assembly.

Each of the time delay switches 85a, etc.`upon energiza'tion of its corresponding coil lla, etc.,

i (is arranged to open only after the lapse of a time interval sufficient to allow the carrier 46 to make a complete revolution-in which a message is sent from each of the records; Forexample, in the apparatus illustrated, assuming that the sending cycle for each record requires one minute, with eight records, as shown, each time delay switch 35a., etc. would be set to open after a time interval of at least 'eight minutes,

and preferably a somewhat greater time interval, say ten minutes. of contacts on the protected premises are closed at about the same time, resulting in the energization of their corresponding time 'delay switches 85a, etc., these switches cannot open and thus lose the actuation until their corresponding records have been moved to the transmitter' to send the appropriate impulses and telephonie alarms,

V and this is so even though all of the pairs of less, and as the number of substantially jsimul- .taneous actuations on the premises increases,

the number of repeats for each record decreases. Thus, the system provides desirable repetitions 'of' the messages when there isy little demand on the transmitting apparatuabutautomatlcally cuts down on the number of repetitions as the demand increases. f y

In the new system, there isino danger of interference with the transmitting cycle in the event that one of 'the 'alarm circuits is operated while a message is being transmitted, since the contacts 1G are opened as soon as a record has been,`

selected and remain open while the transmitting Thus, when two or more pairs are operated concurrently; the selector` operates successively, that is selects kthe corresponding records in the order in which their 'respective' contacts 80a, etc., are engaged by the brush 61. After the code impulses and the telephonie alarmmessage have been transmitted las a result of the closing of a pairof alarm contacts, the contacts 91a, for example, the latter are reset vInanually so as to break thealarrn circuit through energizedand cause the contacts 85a to close and the'contacts 83a to open; The recorder 26 provides on the, tape 21 a permanent record of each telephonie message received at the receiving station so that insurance companies, etc.,

them, whereby the coils liak and H1201. are demay be assured that anappropriate telephonie v alarm message was sent to the proper authority. After the attendant at the receiving station has moved switch 29 into engagement with contact i 25 and received the telephonie message, the switch is automatically returned to contact 28 by spring 39.50 that the receiving stationis prepared to receive another coded message.

While I have illustrated a single transmission line for sending both the telephonie and the coded messages, it will be understood that a separate line may be' usedk for the coded message. Also, whilel thetime delay switches 85 may be used to advantage where it is desired to automatically break the circuits through the protected premises after they are closed, it will be understood that these switches may, if desired, be eliminated, in which case the circuits are broken when the premises is inspected and the contacts 91 are reset.

I claim: 1

l. Atelephonic alarm system for a plurality of areas to be protectedrwhich comprises a phonograph pick-up common to all of the areas, a

central receiving station, a" transmissionl line between the pick-up and the receiving station, a phonograph yrecord for each area operable on the pick-up to send a telephonie alarm message over said line indicating the location of the area, a selector common to all of the areas and operable from each area to select alrecord for operating on thek pick-up, impulsing vcontacts near the ypick-up, `actuating means, one vfor each record,

for causing the contacts to open and close inv a predetermined sequence, and a recording device connected to the impulsing contacts for recording pick-up to send a telephonie lalarm message over said line indicating the rlocation of the area, s'elector means common to all ofthe areas andoperable from each area to select the corresponding record for operatingk on the pick-up and to rotate the record, impulsing contacts near the pickup, actuating means, one for each record, operable by the, selector means to cause said contacts to open and close in a predetermined sequence,

anda recording device at the central stationconnected to the impulsing contacts for recording the impulses initiated by reach actuating means to identify its corresponding record.

3. A telephonie alarm system for a plurality of areas to be protected which comprises a phonograph `pick-up 'common vto all of the areas, a central station having a receiver, a transmission line between the pick-up and the receiver, a phonograph record for each area operable on the pick-up to send a telephonie alarm message over said line to the receiver for indicating the location of the area, a selector common to all of the areas and operable from each area to move the corresponding record into cooperative relationV with the pick-up, impulsing contacts connected in the transmission line near the pick-up,

' actuating means, one for each record, for causing the contacts to open and close in a predetermined sequence, a recording device at the central station for recording the impulses initiated by each actuating means to identify its corresponding record, and switching means at the central station for selectively connecting one of said receiver and recording device into the transmission line and disconnecting the other therefrom.

4. A telephonie alarm system for a plurality of areas to be protected which comprises a phonograph pick-up common to all of the areas, a central station having a receiver, a transmission line between the pickup and the receiver and including a high resistance element near the pick-up, a phonograph record for each area operable on the pick-up to send a telephonic alarm message over the line to the receiver for indicating the location of the area, a selector common to all of the areas and operable from each area to move the corresponding record into cooperative relation with the pick-up, impulsing contacts for shunting said resistance, actuating means, one for each record, for causing the contacts to open and close in a predetermined sequence and thereby create current impulses at the central station, and a recording device at the central station for recording the impulses initiated by each actuating means to identify its corresponding record.

5. A telephonie alarm system for a plurality of areas to be protected which comprises a phonograph pick-up common to all of the areas, a central receiving station, a transmission line between the pick-up and the receiving station, a phonograph record for each area operable on the pick-up to send a telephonie alarm message over said line indicating the location of the area, a selector common to all of the areas and operable from each area to select a record for operating on the pick-up, impulsing contacts mounted on the pick-up, actuating means, one for each record, for causing the contacts to open and close in a predetermined sequence, and a recording device connected to the contacts for recording the impulses initiated by each actuating means to identify its corresponding record.

6. An alarm circuit for a plurality of areas to be protected which comprises a plurality of alarm circuits, one for each area, a phonograph pickup common to all of the circuits, a central station having a receiver, a transmission line connecting the pick-up and the receiver, a phonograph record for each circuit operable on the pick-up to send a message over the line indicating the location of the area corresponding to the circuit, a plurality of control elements, one for each circuit, a selector cooperating with said elements and engageable therewith, driving means for relatively moving the selector and said ,control elements-in-response to actuaton'of one of said alarmr circuits, means responsive to engagement of'said selector with a control element corresponding to an actuated circuit for rendering said driving means inoperative, means under control of said selector for moving the record corresponding to an actuated circuit into cooperative relation with the pick-up, impulsing contacts near the pick-up, actuating means, one for each record, operable to cause said contacts to open and close in a predetermined sequence, and a recording device at the central station for recording the impulses initiated by each actuating means to identify its corresponding record.

'7. A telephonie alarm system for a plurality of areas to be protected which comprises a phonograph pick-up common to all of the areas, a central receiving station, a transmission line between the pick-up and the receiving station, a phonograph record for each area operable on the pick-up to send a telephonie alarm message over said line indicating the location of the area, a selector common to all of the areas and operable from each area to select a record for operating on the pick-up,` impulsing contacts connected in the transmission line near the pick-up, actuating means movable with each record relative to the contacts to cause the contacts to open and close in a predetermined sequence, and a recording device connected to the contacts for recording the impulses initiated by each actuating means to identify its corresponding record.

8. A telephonie alarm system for a plurality of areas to be protected which comprises phonon graph pick-up means, a central receiving station, a transmission line between the pick-up means and the receiving station, record means for each area operable on the pick-up means to send a telephonie alarm message over said line indicating the location of the area, a selector common to all the areas and operable from each area to select the corresponding record means for operating on the pick-up means, impulsing contacts near the pick-up means, a recording device connected to the impulsing contacts for recording the impulses initiated thereby, and actuating means, one for each of said record means, operable by the selector-to cause said contacts to open and close in a predetermined sequence and thereby operate said recording device to identify the corresponding record means.

9. A telephonic alarm system for a plurality of areas to be protected which comprises phonograph pick-up means, a central receiving station, a transmission line between the pick-up means and the receiving station, record means for each area operable on the pick-up means to send a telephonie alarm message over said line indicating the location of the area, a selector common to all the areas and operable from each area to select the corresponding record means for operating on the pick-up means, electrical impulsing means, a recording device connected to the impulsing means for recording the impulses initiated thereby, and actuating means, one for each of said record means, operable to cause said contacts to open and close in a predetermined sequence and thereby operate said recording ldevice to identify the corresponding record means.

RICHARD D. LIGI-ITFOOT.

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