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US2644937A - Apparatus for the transmission of alarm signals - Google Patents

Apparatus for the transmission of alarm signals Download PDF

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Publication number
US2644937A
US2644937A US177267A US17726750A US2644937A US 2644937 A US2644937 A US 2644937A US 177267 A US177267 A US 177267A US 17726750 A US17726750 A US 17726750A US 2644937 A US2644937 A US 2644937A
Authority
US
United States
Prior art keywords
relay
contact
seconds
transmission
dash
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
US177267A
Other languages
English (en)
Inventor
Chauveau Louis
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.)
Societe Francaise Radio Electrique
Original Assignee
Societe Francaise Radio Electrique
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
Priority to BE476714D priority Critical patent/BE476714A/xx
Priority to FR937297D priority patent/FR937297A/fr
Priority to US1976A priority patent/US2533765A/en
Priority claimed from US1976A external-priority patent/US2533765A/en
Priority to FR59796D priority patent/FR59796E/fr
Application filed by Societe Francaise Radio Electrique filed Critical Societe Francaise Radio Electrique
Priority to US177267A priority patent/US2644937A/en
Application granted granted Critical
Publication of US2644937A publication Critical patent/US2644937A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
    • H04L15/24—Apparatus or circuits at the receiving end
    • H04L15/26—Apparatus or circuits at the receiving end operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions

Definitions

  • the purpose of my present invention is toprovide a remedy, to a certain extent, to the aforesaid drawback. It essentially consists in making reversible the auto-alarm apparatus, i. e., ⁇ in' permitting of using them either as reception selectors, Aor automatic transmission keying systems.
  • the auto-alarm selectors include all the necessary members for controlling spaces and dashes with accuracy; consequently itwill suffice to adapt them in ak suitable manner so as to make them control a keying relay which actuates the transmitter of the ship in such manner that 'the dashes have four seconds duration and spaces one second, the result being readily Yobtained Within a precision of the order of le of a second. Under thesefconditions, in any vessel equipped A with an auto-alarm selector provided withthe improvementv in conformity with the invention, it will be possible,- if need be,
  • the invention is particularly concerned with the adjunction to'existng auto-alarmgselectors, of ⁇ devices v,pemiitting Vof combining the various members of the selector in such manner that the duration of the complete cycleis of 5 seconds and second.
  • one may eventually provide a member Whichstops they system after the transthe control ofthe transmission is interrupted during' one second .in the course of each cycle;
  • transmitter thus controlledtransmits dashes of four ⁇ seconds duration separated by spaces ofv one mission of. twelve dashes of four seconds.
  • relay AT4 works, that is when a correct dash has just been received, the contact 32 supplies a system SIL of slugged relay with capacitor 33 and resistor 34, the whole having a time constant of 1.5 seconds; as a result, at the end of a correct dash, SIL maintains the whole being supplied so long as silence does not last more than 1.5 seconds.
  • the additional elements are connected to the preselector comprising the invention as shown in the broken line wiring diagram of the drawing.
  • the switch I closes the circuit of the relay CEM.
  • the latter carries a changeover contact C which transfers the circuit of DM from contact 1 of RR to make it connect by way of contact B of T5; this relay CEM is also fitted with a make contact D which short circuits part of the resistance 34.
  • the time constant of the assembly, relay SIL, condenser 33 and resistance 34 is reduced from 1.5-0.5 seconds.
  • relay T5 operates, cuts the general supply (voltage divider 2) and locks on by way of the contact of relay SIL.
  • the relay T5 by its contact B provides for the energizing of DM which opens its contact 5.
  • the energizing of relay T5 is assured by the contact of SIL for a period of 0.5 second, after which, relay SIL and relay T5 are energized. 0.4 second after the deenergizing of relay SIL, DM drops off, the
  • the synchronously oscillating relay or intermittent contacter I is constituted in the following manner:
  • a flywheel 9 mounted on a shaft I0 to which is attached the spiral spring I I constitutes a balance wheel whose period is of the order of l second; that is to say it makes two half oscillations per second.
  • the shaft is supported in two bearings I2 and I3.
  • this wheel carries a magnetic portion I4, which is attracted by the solenoid I5, the circuit of the latter being controlled by the contact I6, the latter contact working under the action of an arm I1 integral with the shaft.
  • the shaft I0 carries a hanged collar I9 with a rounded notch which engages the roller 20 carried by lever 2
  • a spring 22 pulls in this lever so that it maintains the balance wheel in its position of rest.
  • the lever 2l can be displaced by the solenoid 23 so that it frees the balance wheel and allows it to go into action.
  • contact 8 can be displaced ina slot 24. It is therefore possible to obtain an advance or'retard in relation to the balance movement by the positioning of the contact which ensures very precise adjust ment of the measure of duration of a dash, as will be explained by the following:
  • This positioning of the moving contact 8 constitutes another feature of the invention.
  • Another feature of the invention lies in the association of a balance wheel with a torque relay LAN, these two elements being interconnected according to Fig. l.
  • 'Ihe relay LAN is disposed in such a way as to impart a strong current impulse to the solenoid I5 at the moment of unlocking, and up to the time of the establishment of contact I6; at this moment the relay LAN operates so as to include the contact I6 in the circuit of the maintaining solenoid I5.
  • a resistance 25 allows control over the intensity of the impulses to obtain correct and continuous functioning of the oscillating relay.
  • circuit A is switched on with a lag 0.4 second, the unlocking relay 23 operates freeing the balance wheel of the oscillating relay; at the same time the maintaining solenoid I5 is fed by Way of contact 26 of relay LAN which is not yet energized.
  • a strong impulse drags the balance wheel in a clockwise direction until arm I1 closes contact I6; this latter then feeds relay LAN which closes and locks on by its contact 21.
  • Contact 26 connects the solenoid circuit I5 to the resistance 25 and contact I5.
  • the balance wheel receives a first and strong impulse, which ensures prompt starting-up and that it maintains its v oscillation under the action of suitably regulated impulses transmitted by contact lli.k
  • each oscillation contact B' is closed. At the first oscillation its closing takes place abouti); second after the commencement l of oscillation of the balance wheel. It controlsl the circuit of the relay network 'T1-T4 togetherwith thatofthe auxiliaries AT1-ATi in such away that one'set of relays is energized at each impulse.
  • each cycle of the alarm transmitter can be split up into four periods: one period of 0.1 second, corresponding to the delay in the transmission of the first impulse by the intermittent contactor; one period of 4 seconds corresponding to four complete oscillations of the intermittent contactor, a period of 0.5 second or drop-off-lag of relay SIL, and a period of 0.4 second corresponding to the lag in droppingoff of relay DM.
  • relay RM whose supply is controlled by contact A of relay E1, will be energized for 4 seconds, and will be at rest forl second. Finally, relay RM by way of its contact keys the transmitter.
  • a twelve contact telephone stepper switch (not shown) may be connected in parallel with RM, or be controlled by the latter, so that after the tenth dash, this stepper breaks the circuit of CEM, thereby terminatingr transmission.
  • the auto-alarm selecting apparatus which comprises a stabilized, constant speed motor are equally lcapable of being improved by using the device of the invention. 'In the case of such apparatus however, it is simpler-to'adjoin them to a cam driven by the motor and arranged so as to directly control the appropriate transmission;
  • a di-l rect current power supply a potentiometer, three electromagnetic relays each having a contact member, said potentiometer being fed from said power supply through the contact members of said three different relays, a mechanism with pendular oscillations, means for normally blocking said mechanism, means for unblocking said mechanism when the potentiometer is connected to the power supply, means connected to the potentiometer and adapted to impart to said mechanism a constant oscillation period equal to the space duration of said signals and being a submultiple of the dash duration of said signals, a chain of interconnected countingrelays, a line connected to the potentiometer, adjustable means cooperating with said line and with the said Vmechanism to connect said line to the relays,said
  • means including a member producing one pulse ing relay-andadapted to connectthe recording relay to the said potentiometer, a relay controlling the transmitter operation, means to conl nect said last mentioned relay to the power supply through a resting contact of the recordingY n relay, means for periodically opening the circuit to said potentiometer and power supply, said lastmentioned means including three relays each having an armature rand coacting contacts respectively designated make-and-break cut-off, silence, and starting relays controlling the three aforementioned contacts, and connecting the potentiometer to one terminal of the power'supply, the two silence and startingv contacts being mounted in parallel, and connected in series with the contacts of the third make-and-break cutoff relays, which separates them from the potentiometer, means associated with the silence relay and with one of the contacts of the last counting relay to actuate the silence make-contact opening with a given time delay, the beginning o f the delay period coinciding with the opening of the potentiometer supply circuit, means associated with the starting relay, with the

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Relay Circuits (AREA)
US177267A 1947-01-29 1950-08-02 Apparatus for the transmission of alarm signals Expired - Lifetime US2644937A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE476714D BE476714A (fr) 1947-01-29
FR937297D FR937297A (fr) 1947-01-29 1946-12-10 Appareil sélecteur d'alarme
US1976A US2533765A (en) 1947-01-29 1948-01-13 Selector apparatus for alarm signals
FR59796D FR59796E (fr) 1947-01-29 1949-12-13 Appareil sélecteur d'alarme
US177267A US2644937A (en) 1947-01-29 1950-08-02 Apparatus for the transmission of alarm signals

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR2644937X 1947-01-29
US1976A US2533765A (en) 1947-01-29 1948-01-13 Selector apparatus for alarm signals
FR59796T 1949-12-13
US177267A US2644937A (en) 1947-01-29 1950-08-02 Apparatus for the transmission of alarm signals

Publications (1)

Publication Number Publication Date
US2644937A true US2644937A (en) 1953-07-07

Family

ID=32303557

Family Applications (1)

Application Number Title Priority Date Filing Date
US177267A Expired - Lifetime US2644937A (en) 1947-01-29 1950-08-02 Apparatus for the transmission of alarm signals

Country Status (3)

Country Link
US (1) US2644937A (fr)
BE (1) BE476714A (fr)
FR (2) FR937297A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1967396A (en) * 1927-12-02 1934-07-24 Louis L E Chauveau Alarm selector apparatus
US1970455A (en) * 1929-04-29 1934-08-14 Siemens Brothers & Co Ltd Electric selector
US2462875A (en) * 1944-08-15 1949-03-01 Standard Telephones Cables Ltd Automatic alarm signaling system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1967396A (en) * 1927-12-02 1934-07-24 Louis L E Chauveau Alarm selector apparatus
US1970455A (en) * 1929-04-29 1934-08-14 Siemens Brothers & Co Ltd Electric selector
US2462875A (en) * 1944-08-15 1949-03-01 Standard Telephones Cables Ltd Automatic alarm signaling system

Also Published As

Publication number Publication date
FR59796E (fr) 1954-07-19
BE476714A (fr)
FR937297A (fr) 1948-08-12

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