US1974551A - Automatic telephone signaling apparatus - Google Patents

Automatic telephone signaling apparatus Download PDF

Info

Publication number
US1974551A
US1974551A US645846A US64584632A US1974551A US 1974551 A US1974551 A US 1974551A US 645846 A US645846 A US 645846A US 64584632 A US64584632 A US 64584632A US 1974551 A US1974551 A US 1974551A
Authority
US
United States
Prior art keywords
motor
dialling
line
circuit
alarm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US645846A
Other languages
English (en)
Inventor
Tuseher Jean Edouard
Spiro Marcel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
L AVERTISSEUR TELEPHONIQUE AUT
L'AVERTISSEUR TELEPHONIQUE AUTOMATIQUE Ste
Original Assignee
L AVERTISSEUR TELEPHONIQUE AUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by L AVERTISSEUR TELEPHONIQUE AUT filed Critical L AVERTISSEUR TELEPHONIQUE AUT
Application granted granted Critical
Publication of US1974551A publication Critical patent/US1974551A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/272—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/274—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
    • H04M11/045—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems using recorded signals, e.g. speech

Definitions

  • This invention relates to protective alarm systems for buildings, adapted automatically to transmit an alarm message telephonically, and more especially to systems of this character capable of operating in conjunctionwith a subscribers telephone line terminating at an automatic exchange.
  • An object of the invention is the provision of a protective system for association with a dial actuated subscriber's telephone line which, upon occurrence of conditions requiring that an alarm be given. will automatically dial a preselected station and transmit an alarm message phonographically thereto.
  • a feature of the invention is the optional incorporation therein or means whereby the alarm apparatus will dial in sequence two or more preselected stations and transmit the alarm message phonographicalLv to each. This same modification permits of calling stations several times in succession to guard against the contingency of a busy line.
  • the apparatus whereby these results are achieved is reliable of operation and 01 compact structure.
  • the alarm mechanism which is separate and apart from the subscriber's telephone set may be housed in a sound-proof casing, and placed out of sight, as for example, in a desk drawer, etc.
  • Fig. 1 is a composite showing or the electrical protective circuits and cooperating mechanical features illustrating the principles of operation for a modification oi the invention actuated from an electrically driven motor.
  • Fig. 2 is a sectional elevation of the dialling mechanism incorporated in the Fig. 1 structure.
  • Fig. 3 is a wiring diagram showing the manner in which the dialling mechanism and phonographic message transmitting device of the protective system are associated with a subscribers telephone line extending to an automatic 'exchange.
  • Figs. 4-13 inc. show a second modification oi the invention actuated by a mechanically driven motor.
  • Figs. 4 and 5 show in plan view and sectional elevation the mechanical details of this construction.
  • Fig. 6 is a wiring diagram of the telephone connections.
  • Fig. '1 is a detail showing the'mechanical features of the starting device.
  • Figs. 8 and 8a are details illustrating the mechanism for stopping the device.
  • Figs. 9 and 10 are respectively an elevation and a sectional elevation of the cam actuated dialling mechanism.
  • Fig. 11 illustrates an individual dialling cam
  • Fig. 12 an annular blank insert for separating the dialling cams.
  • Figs. 13 and 14 are respectively a circuit diagram of the telephone connections, and a longitudinal elevation partly in section showing the mechanical features 01' a modifle'd construction of the dialling mechanism whereby alarm messages may be sent to several stations successively.
  • Figs. 15, 16a and b, 17a and b, and 18a and b show in plan view and elevation, the components of the cam assembly incorporated in the Fig. 14 construction, for breaking the microphone cir-' cuit between successive calls, and for actuating the dialling mechanism at proper intervals in the desired sequence.
  • Fig. shows the collar upon which are assembled the cams Figs. 16 and 18 separated by insert blanks Fig. 17.
  • Figs. 19a and b show in plan view and sectional elevation, a irusto-conical insert member of the repeat call dialling mechanism of the Fig. 14 assembly.
  • the protective circuit 101 is normally closed by a plurality of switches 102 located at various points on the premises to be protected and which will be opened in the usual way when such premises are invaded.
  • the protective circuit 101 energized irom a source of electrical power supplied to terminals 100, and controlled by a switch 103 having an oil position 104, normally energizes an electromagnet 105 to open a switch 106 closure of which completes a circuit over conductor 107 through an electromagnet 108 which, when energized, starts the signaling apparatus in a manner presently to be described.
  • AlternativeLv energization of electromagnet 108 may be under control of normally open protective circuits such as those including switches 109 and 109', adapted to be closed upon entry of an in- I the phonographic record, cylinder or strip on which is recorded a. suitable message of warning to the station dialed that the protected premises are being invaded.
  • normally open protective circuits such as those including switches 109 and 109', adapted to be closed upon entry of an in- I the phonographic record, cylinder or strip on which is recorded a. suitable message of warning to the station dialed that the protected premises are being invaded.
  • the spindle of the dialling device is axially displaceable. To permit this, its upper end is splined in a quill portion of the spindle 1130f the speed reducer and is driven by said spindle 113 through the medium of a pin 116 mounted in an axial slot of the spindle 113.
  • the lower end 117 of the spindle 115 is threaded and screws in a socket 118 fixed to the frame of the apparatus.'
  • the movement of the spindle of the dialling device is therefore the combination of a rotational one imparted by the spindle 113 of the speed reducer, and a vertical translational movement controlled by the threaded socket 118.
  • the spindle 115 of the dialling device carries one or more dialling cams 119'and a drum 120 to which are imparted its combined rotational and translational movement.
  • wiring diagram showing the telephone connections 121 represents the conventional wiring of a subscribers telephone station arranged for dialling.
  • the subscriber's station is connected over conductors K to an automatic telephone exchange.
  • the alarm system is connected at a convenient point to the subscriber's line It over conductors 122, included in a circuit traced seriatum through contacts of a normally open switch 123, normally closed contacts of switch 126b, controlled by the aforementioned drum 120, and normally closed contacts of switch 126b, actuated by the dialling cam .19, whereby dialling impulses may be transmitted to line It from the alarm system.
  • Closure of switch 123 is effected during rotation of motor 111, through lateral displacement of the slideblock 124 afiixed to the centrifugal governor 125, thus connecting the alarm apparatus to line k.
  • the contacts of switch 126a are maintained closed by drum 120 in the manner shown in Fig.
  • Automatic operation of the system to dial a selected station and transmit the alarm message thereto are effected as follows:
  • the alarm mechanism having been set by closure of switch 104, entry of the protected premises opens a switch 102, or closes a switch 109, to energize relay 108 in the manner described.
  • the motor 111 having been started by actuation of lever 110 upon energization of electromagnet 108, the axial displacement of the slide block 124 due to rotation of the centrifugal governor 125, closes switch 123 to complete the circuit traced from line k through the dialling switch 126b.
  • the cams 119 and the drum 120 are designed in such manner as to call the required number, i. e. to reproduce automatically the dialling operations of the manual dialling device of the subscriber's telephone set 121. If, however, the telephone is of the manual exchange central oflice battery type, the dialling cams are not required for the reason the direct current path established between the conductors of line k upon closure of switch123, will light the pilot lamp before the central oflice operator, and she will answer in the usual way to complete the call to the desired station in accordance with instructions transmitted phonographically from the microphone pick-up 127.
  • the motor of the apparatus is a mechanical motor whose spring is lodged in the drum 1.
  • the spring re-winding mechanism is shown at 2.
  • the whole apparatus is mounted within a casing 3 which may incorporate a sound proofing material.
  • the crown wheel 4 of the drum drives the various mechanisms of the apparatus through a gear train 5-6, 7-8, 9 and 10.
  • the spindles of the drum and gears are mounted between two mounting plates 11 and 12 which are braced by three struts 13 resiliently mounted on the casing 3 of the apparatus.
  • the signaling apparatus operates'as follows: When'one of the contacts 102 and 109 of the protective circuit illustrated in Fig. 1 is actuated, the electro-magnet 14, Figs. 4, 5 and 7, is energized and attracts its armature 15 which, through the medium of the pivot lever 16, releases the drop 17, the latter as it falls, depressing the rod 18 below the stop pin 20 fixed on the ledge of the tumtable 19 of the phonograph, thus initiating operation of the entire mechanism.
  • the turntable 19 set on the spindle of the pinions 7 and 8 being released, the spring ofthe drum 1 unwinds driving the various members of the apparatus through the rotation of the crown wheel 4 and of the pinions 56, 78, 9 and 10.
  • the telephone connection, Fig. 6, is made for example at any suitable point of the telephone line 1:: extending from the subscriber's set 21 to an automatic exchange.
  • the circuit of the subscriber's telephone is by way of k, b, c, I, that is, through the contacts b--c of the twoway switch b c d of the signalling apparatus.
  • the two-way switch b c d is controlled automatically by the slide block it of a centrifugal governor 21.
  • the dialling device n illustrated in Figs. 9 and 10 is at this instantin the position of Fig. 9 in which it holds the switch e f 9 closed by acting on the push button 23.
  • the push button 23 of the switch encounters the sets of dialling cams 24, the contacts I g are broken as each cam tooth passes under the push button 23 at the required rate to actuate the selectors of the exchange, and consequently to call the number of the emergency station sought for.
  • the adjustable resistance r is inserted in the circuit of the microphone pick-up m to adjust, according to the resistance of the line and the voltage of the exchange battery, the signal intensity reproduced at the called station.
  • the motor is stopped by means presently to be described.
  • the slide block h of the governor 21 then returns to its position of rest, first breaking, the microphone circuit k b d r m f g k, and then remaking the subscribers telephone circuit k b c l k, whose line is released.
  • the spindle 25 of the dialling device 11, Fig.- 10 rotates at predetermined speed in a tapped guide member 26, mounted on the mounting plate 12. It is driven by the pinion 9 through the toothed wheel 6 and rotates in an adjustable step bearing 27.
  • the dialling device 1:. is constituted by a cylindrical member to which a helicoidal movement is imparted through the medium of a pin 28 secured tothe spindle 25, said pin sliding in a suitable slot of the dialling device n.
  • the pitch of the helix is determined by the thread of the support 26 onto which the dialling device 11. is screwed in such wise that the push button 23 of the switch e f g is pushed back successively by each tooth 4 of the earns 24.
  • Said cams 24 are so cut out that the digit 0, comprising a series of ten interruptions, occupies half the circumference of an individual cam, Fig. 11.
  • the dialling device n includes as many'dialling cams 24 as there are digits in the number of the station called. Each cam is separated from the next one by an insert member 29, Fig. 12. The cams and their insert pieces are centered on the dialling device 12 and are clamped by a screw 30,
  • the circuit k b d r m f g k is established.
  • the microphone of the phonograph pick-up m is of standard construction. It is mounted in a casing 31 by means of a screw 32 at the end of an arm 33, mounted to swivel in all directions on a pivotal support 34 carried by the plate 12 as shown in section in Fig.5.
  • 'A phonograph diaphragm stylus support is mounted on the casing 31.
  • the sound vibrations transmitted by the emergency signal call recorded on the record 36 are transmitted to the carbon membrane 37 of the microphone m by the screw 38 of the support 35 which bears on the carbon membrane through the medium of a leaf 39 with a pressure that can be adjusted.
  • the screw 38 passes through a resilient membrane 40 aflixed to the bottom of the casing 31, which membrane attenuates stray vibrations in the telephonic transmission of the call recorded.
  • the call is recorded on the surface of the record 36 for a width corresponding to a revolution of the drum 1, that is to say, approximately 40 turns for the apparatus illustrated herein.
  • a finger 41 fixed on a cursor '42 of the arm 33 encounters a cam 43 rotating with the drum 1.
  • Said cam 43 is slotted so that in passing under the finger 41 it raises the microphone and rotates it untilthe needle 44 of the record returns to its starting position on the record 36.
  • the call recorded is thus repeated at eachrevolution of the drum 1.
  • the cursor 42 v to rotate and slide on the arm 33, the lift and angular displacement of the needle 44 of the microphone are adjusted.
  • the knob 45 enables the corsor 42 to be clamped on its spindle.
  • the drum 1 carries laterally one or more fingers 46 which drive a ratchet wheel 47 (Figs. 8 and 8a) mounted on a spindle 48 provided with a tapped head 50 which screws into a support 49 fixed under the upper plate 11.
  • a ratchet wheel 47 (Figs. 8 and 8a) mounted on a spindle 48 provided with a tapped head 50 which screws into a support 49 fixed under the upper plate 11.
  • the ratchet 47 arrests the driving finger 46 and hence the drum 1 and the whole apparatus.
  • the rated speed of the whole apparatus is regulated through the medium of the lever 51 (Fig. 4) which limits the up stroke of the slide block it of the governor 21 through a stop 52 at the end of the lever 51.
  • each set of cams is separated by frusto-conical insert members 55, the larger base of each of which faces upwardly.
  • the pinion 9 driving the shaft 25 of the dialling device is mountedon a sleeve 56 freely rotatable in cylindrical bearings of the support 26 of the dialling device.
  • the pinion 9 carries on its lower face one or moredriving fingers 57, while the spindle o! the dialling device has mounted on an appropriated collar 58 another driving finger 59 in alignment with fingers 57.
  • the shaft 48 of the stopping mechanism is extended below the ratchet wheel 47 to receive the collar 60 whose angular position on the spindle is controlled by a needle screw.
  • On the collar 60 v are assembled the cams 54 controlling the switch 0 p (Fig. 13) and the cam 61 controlling the movement of the dialling device n through the medium of a clutch lever 62 pivoted on the spindle 63.
  • the repeat call signaling apparatus operates as follows: When the fall of the shutter 1'7 (Fig. '7) has set the apparatus in motion through the means previously described, the adjustable screw 64 of the lever 62 encounters the first cam 61 controlling the dialling device 11. after a time interval determined by the position of the driving fingers 46 of the ratchet 4'7 on the drum 1. At this moment, the end 65 of the lever 62 will raise the spindle 25 of the dialling device n, one of the driving fingers 57 of the pinion 9 will meet, asit rotates, the corresponding finger 59 of the clutch disc 58 of the spindle 25.
  • the spindle 25 will then start rotating, driving, through the means previously described, the dialling device n, for a length of time determined by the length of the cam 61 and sufficient to assure dialing of the digits, two in the example illustrated, of the first station called.
  • the ratchet wheel 47 continuing its intermittent helicoidal motion, will elevate with it the collar 60 until the screw 64, having traversed the first insert blank 67, encounters the first cam 54.
  • the cam 54 encounters the push button 53 of the switch 0 p, the telephone circuit is broken at o p and the first call will terminate.
  • This first break of the circuit will last for a time corresponding to the length of the cam 54, then the telephone circuit will be established at o 11.
  • the second cam 61 will encounter the screw 64 causing the dialling device to be moved a second time in the manner described, to make the second call.
  • the second conical insert member 55 will then open contacts e f to connect the pickup m to line is for transmission of the alarm message to the second station. This sequence of operations will be repeated in the same manner for the third or any greater number of calls.
  • an automatic exchange telephone line in combination, an automatic exchange telephone line, a protective circuit, a motor, means responsive to a disturbance of said circuit for starting said motor, impulse transmitting means adapted to dial several stations responsive to said motor for automatically connecting said line to a particular station, a phonographic device actuated by said motor to send an alarm message over said line subsequent to said station selection, said device having a nonacoustical pick-up for silent actuation, means producing continuous repetition of said phonographic message so long as said motor is operative and means abruptly stopping the motor to terminate said alarm after a predetermined plurality of message repetitions.
  • an automatic exchange telephone line extending to'a dial telephone set, an alarm system separate and distinct from said set comprising a protective circuit, a motor, means responsive to a (fisturbance of said circuit for starting said motor, and means operated by said motor consisting of, a switch centrifugally actuated to disconnect saidset from said line and to connect said alarm system thereto, cam actuated multiple digit dialling means for automatically connecting said line to a particular station, a phonographic device for sending an alarm message over said line subsequent to dialing, means producing continuous repetition of said message while said motor is operative, and means stopping said motor after a predetermined number of message repetitions.
  • an automatic exchange telephone line in combination, an automatic exchange telephone line, a protective circuit, a motor, means responsive to disturbance of said circuit for starting said motor, and means operated by said motor comprising, cam actuated dialing means for connecting said line to a particular station, said means including a cam disc for each digit of the called station number, a phonographic device adapted to send an alarm message over said line, means connecting said device thereto subsequent to said station selection thereby to prevent transmission of false impulses during dialing, and means abruptiy stop ping said motor to terminate the alarm after a predetermined alarm interval.
  • an automatic exchange telephone line in combination, an automatic exchange telephone line, a protective circuit, a motor, means responsive to disturbance oi. said circuit for starting said motor, and means operated by said motor comprising, cam means actuating impulsing means for connecting said line to a particular station, said cam means including a drum bearing a separate cam disc for each digit of the called number, means for imparting helicoidal motion to said drum whereby said discs operate successively on said impulsing means, a phonographic device adapted to send an alarm message, means operatively connecting said device to said line subsequent to the station selection, and means abruptly stopping said motor to terminate the alarm.
  • an automatic exchange telephone line in combination, an automatic exchange telephone line, a protective circuit, a motor, means'responsive to a disturbance of said circuitfor starting said motor, impulse transmitting means responsive to said motor for automatically connecting said line in sequence to a plurality of prearranged stations, phonograph means actuated by said motor to send an alarm message to each said station, means for automatically stopping said motor thereafter, and means preventing. said message transmission during selection of said stations thereby to prevent transmission of false dialing impulses.
  • an alarm system comprising, a protective circuit, a motor, means responsive to disturbance of said circuit for starting said motor, a phonographic device adapted to send an alarm message over said line, impulsing means adapted to connect said line in sequence to a plurality of stations, and clutch means responsive to said motor for causing said impulsing means to select a station and for thereafter connecting said phonographic device to said line thereby to transmit the alarm message, said clutch means being subsequently operative similarly to connect said line to each of the remaining stations.
  • an automatic exchange telephone line in combination, an automatic exchange telephone line, a protective circuit, a motor, means responsive to disturbance of said circuit for starting said motor,aphonographic device adapted to send an alarm message over said line, impulsing means for automatically connecting said line in sequence to a plurality of stations, cam driven clutch means intermittently actuated by said motor for causing said impulsing means to select said stations, said clutch means releasing for an interval following each said selection to permit transmission of the alarm message, and means stopping said motor following transmission of the alarm to all stations.
  • an auto-' matic exchange telephone line in combination, an auto-' matic exchange telephone line, a protective circuit, a motor, means responsive to a disturbance of said circuit for starting said motor, and means operated by said motor comprising, a phonographic device adapted to send an alarm mes-- means for operatively associating said phonographic device with said line between successive stations selection for transmission of the alarm message to each.
  • an alarm system comprising, a protective circuit, a motor, means responsive to disturbance of said circuit for start ing the motor, and means actuated thereby for signaling the central oflice and thereafter sending an alarm message over said line, and a rotatable member helicoidally advancing to abutment with a fixed member to stop said motor after a predetermined interval of rotation.
  • an alarm system distinct from said set comprising, a protective circuit, a motor, means responsive to disturbance of said circuit for starting the motor, and means actuated thereby consisting of, a centrifugally actuated switch for disconnecting said set and connecting the alarm system to said line, means for signaling the central office and for thereafter sending an articulate alarm message over said line, and means abruptly stopping the motor after a predetermined interval of rotation to prevent transmission of false dialing impulses.
  • 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 alarm.
  • an alarm system comprising a protective circuit, a motor, means responsive to a 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 in sequence to a plurality of preselected stations, said impulsing means being operative with respect to each station, to short circuit said output path du'ring station selection, thereby to prevent false dialing impulses and to thereafter remove said short circuit to permit transmission of the alarm message, and means automatically opening said output path following transmission of each said message thereby to release each station and permit selection of the succeeding station, and means abruptly stopping said motor following transmission of the alarm message to all said stations 14.
  • an automatic exchange telephone line in combination, an automatic exchange telephone line, a protective cir- 25 cuit, a motor means responsive to electrical disturbance of said circuit for starting said motor, dialling means operated by said motor including a helicoidally advancing drum provided with spaced cam discs successively actuating impulsing means 0 for automatically connecting said line to a particular station, a phonographic device for sending -an alarm message over said line, and a switch actuated upon advance of said drum for opera- .tively connecting said phonographic device to said 5 line subsequent to dialling.
  • an automatic exchange telephone line in combination, an automatic exchange telephone line, a protective circuit, a motor, means responsive to disturbance of said circuit for starting the motor, dialling no phonographic device to said line for an alarm interval following each station selection.
  • dialling means to select a station, and for thereafter rendering said dialling means inoperative while connecting said phonographic device to said line for transmission of the alarm message, and cam controlled switching means adapted to open the line to release each station subsequent to transmission of the alarm message thereby to permit selection of the succeeding stations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephone Set Structure (AREA)
US645846A 1931-12-06 1932-12-05 Automatic telephone signaling apparatus Expired - Lifetime US1974551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2099913X 1931-12-06
FR399675X 1931-12-09

Publications (1)

Publication Number Publication Date
US1974551A true US1974551A (en) 1934-09-25

Family

ID=31995635

Family Applications (2)

Application Number Title Priority Date Filing Date
US645846A Expired - Lifetime US1974551A (en) 1931-12-06 1932-12-05 Automatic telephone signaling apparatus
US744834A Expired - Lifetime US2099913A (en) 1931-12-06 1934-09-20 Automatic telephone signaling apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
US744834A Expired - Lifetime US2099913A (en) 1931-12-06 1934-09-20 Automatic telephone signaling apparatus

Country Status (6)

Country Link
US (2) US1974551A (xx)
BE (1) BE392860A (xx)
DE (1) DE637982C (xx)
FR (3) FR42939E (xx)
GB (1) GB399675A (xx)
NL (1) NL36780C (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2729707A (en) * 1950-06-07 1956-01-03 Mckellen Samuel Dunseith Telephonic apparatus
US2780671A (en) * 1952-01-30 1957-02-05 Thery Georges Telephonic alarm system
US2883460A (en) * 1953-07-14 1959-04-21 Anatol N Andrews Automatic transmission alarm

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469278A (en) * 1947-03-18 1949-05-03 Ralph A Sears Telephone alarm system
US2661394A (en) * 1951-08-16 1953-12-01 Carsten J Munch Burglary and fire alarm
US2847507A (en) * 1953-09-11 1958-08-12 Charles R Stradley Automatic alarm system
US2830119A (en) * 1954-02-19 1958-04-08 John P Zimmerman Emergency alarm and reporting system
US9327243B2 (en) 2012-08-24 2016-05-03 The Boeing Company Aircraft fuel tank flammability reduction methods and systems
US9061249B2 (en) * 2012-08-24 2015-06-23 The Boeing Company Aircraft fuel tank flammability reduction method and system
US10000294B2 (en) 2012-08-24 2018-06-19 The Boeing Company Aircraft fuel tank flammability reduction method and system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2729707A (en) * 1950-06-07 1956-01-03 Mckellen Samuel Dunseith Telephonic apparatus
US2780671A (en) * 1952-01-30 1957-02-05 Thery Georges Telephonic alarm system
US2883460A (en) * 1953-07-14 1959-04-21 Anatol N Andrews Automatic transmission alarm

Also Published As

Publication number Publication date
DE637982C (de) 1936-11-11
GB399675A (en) 1933-10-12
BE392860A (xx)
NL36780C (xx)
FR42939E (fr) 1934-01-06
US2099913A (en) 1937-11-23
FR44246E (fr) 1934-12-01
FR742567A (xx) 1933-03-10

Similar Documents

Publication Publication Date Title
US1974551A (en) Automatic telephone signaling apparatus
US1882106A (en) Telephone apparatus
US2400085A (en) Timing mechanism
US3272925A (en) Coded disk repertory telephone dialer
US2469278A (en) Telephone alarm system
US1306829A (en) Automatic telephone system
US1933089A (en) Call system adapted to be used in connection with automatic telephones
GB484308A (en) Improvements in automatic burglar and fire alarms
US1154250A (en) Operator's calling device.
DE637912C (de) Selbsttaetiger Stromstossgeber fuer Fernmelde-, insbesondere Fernsprechanlagen
US3125643A (en) Solenoid
US1206987A (en) Dictating phonograph system.
US1867500A (en) Automatic fire and burglar alarm system
US1225935A (en) Fire-alarm telephone transmitting mechanism.
US2399961A (en) Operating phonograph over communication circuits
US2542880A (en) Condition-responsive apparatus for calling preselected telephone numbers
US1209253A (en) Impulse-transmitting device.
US3546382A (en) Telephone actuating alarm assembly
US2476327A (en) Means for recording telephonic messages
US1195499A (en) Automatic fire-alarm
US855168A (en) Signaling-key.
US980883A (en) Telephone-exchange.
US251640A (en) Half to howard
US2213933A (en) Telephone system
US308036A (en) Signal-box