US1934912A

US1934912A - Alarm selector apparatus

Info

Publication number: US1934912A
Application number: US432316A
Authority: US
Inventors: Chauveau Louis Lucien Eugene
Original assignee: CSF Compagnie Generale de Telegraphie sans Fil SA
Current assignee: Thales SA
Priority date: 1927-12-02
Filing date: 1930-03-01
Publication date: 1933-11-14
Anticipated expiration: 1950-11-14
Also published as: FR35676E; BE356113A; GB301753A; GB312234A; BE360487A; FR657899A; US1867209A

Description

Nov. 14, 1933.

L. L. E. CHAUVEAU ALARM SELETOR APPARATUS Original Filed Nov. 19. 1928 I 540w au;ma REND l INVENTOR LOUIS L.E. CHAUVEAU ATTORN EY Patented Novi 14,12933 PATENT OFFICE.

. ALARM SELECTOR AP PARATUS Louis Luciein -Eugene Chauveau, Paris, France, 4 L

assigner to Compagnie Generale de Tele5- graph ieSans Fil, Paris, France, a corporation of France Original application November 19, 1928, 'Serial- No. 320,397, and in France December 2, 1927. .Divided and this application March 1, 1930.

Serial ;No. 432,316

4 Claims. (01. 177-353) 7 k 7 the wheel RT thereupon due tothe action of the t is well known that international commissions have been considering the addition to the S.O. S. distress signal of shipSio'f another signal more A particularly intehdecl to actuate electromagnetic alarm selectors automatically, thus insuring a distress watch in the absenceof the radio operator on thetvessel. This new signal consists in sending out during say one minute intervals a predetermined series of dashes offour seconds separated by'intervals of onesecond.

The present invention isla divisionof mycopending application, Serial No. 320,397 filed No- V'ember 19, 1928 entitled Alarm selectbr apparatus and relates to aselector device having as. one

ticularity in the appended claims.

of itsobjects the actuation'of one .or more suitable electric announcers as soon as a series of three consecutive dashes of four seconds duration, separated by intervals of one second have been recorded by the assembly comprising the radio receiver and the alarm selector.

The novel features which Ibelieve to be cliaracteristic of myinvention are-set forthwith par- My invention itself, h0wever, bOth as to itsorganization and method of operatich will best.be understood by reference to the following description taken in connection with the accompanying drawing in which: 7 a

Fig. 1 represents diagrammatically one e1nbodi ment of the invention; and;

Fig. 2 represents diagrainmatically a modificatien ofthe gearihg systein central mearis.

In Fig,l the reference mark A designates a wheel provided with a" rotative movement at the rate of one revolutionper second and With the facility to 'engage either'the wheel RT, which 'will when engaged by A rotate at the rate of one revolution in 10 seconds, or with the-wheel RE which will when engagediby A rotate at the rate .of one revlution every two seconds; The start of the movement of wheel RT iSfixed b the stop b and it comprises a shoulder 6 which is the means for closing the contact 18 at theendofthe first second, the Contact 14 at the endof the -third second and the contact l7 at the end of the fifth second. These cdntactsjare supported by extension of the Support notshown on the drawing. Relay 56 is c'onnected to the output of any 'suitable receiver (not:shown) in suoh a manner that uponreceipt of a signal 56 is energized, army is pulled'down to contact with :c thus energizing relay MN. Relay MN acts on the lver'of support 50to engage RT with A.

If the dash receivedlasts less than a second the lever of support 50 is released by the relay- MN,

spiral spring SR will return to itsoriginal position before the rlays E1, E2, etc. et the recorder beginto function. r

If the dash received lasts more than one second the contact 18' is closed by the shoulder e and the winding 20 of the slow-releasing relay TC is energized through 5', line L1 contact 18 t0 minus. The contact 19 is then closed. o

If thedash received lasts more than three seconds, that iS, long enough to permit A to turn RTto.such a position that the' cam e closes 14' and approaches 17, the winding2l of relay TC connected with contact .14 willbe energized by the fines L1, L2. 'The winding 20 of relay TC opposes the winding 21. The winding 21 isenergized by a circuit including the contact 18gin the closed position. To obtain the desired eiect in this difierential relay TC the contact 18' must remain closed until 14 is closed. This is insured by making the cam 6 on the wheel RT of suf at' back contact: or, relay Z0. Relay E1 at cona delay of about A tact 22 connects negative to one terminal of silence magnet- SL and at its contact 12 closes a locking circuit for itself Which may be traced front poSitive:at contact 12, winding of 'relay AE1, Winding of relay E1 and to negative at btckcontact of relay ZO. Relay AE1 is not energized at this time since it is short-circuited by direct positive supplied to the winding =of relay E throughcontacts 5, 14, and 13. When the im pulses terminate the short circuit is removed and -relay AE; energizes in series With relay E1.

.Relay AE1 when energized opens 'at 13 the original circuit for E1 and at 14 switches contact 14' to relay E2. 4

If the signal received lasts more than five seconds, the contact 17' is closed, whereupon the plus terminal to the lower contact piece 01 contact 5. Relay SL' is then energized since its circuit is prepared by the contact 22 of relay If the interval lasts about asecondorless, 'that' is, is not long cnough to1e1mit 52 to close '25 before the next dash starts, the windings 56 and MN are energized and break the circuit'through SL' at 5. The wheel RE disengages fro1nAand returns t rest without disturbing the circuits set up by the first dash of about four seconds duration.

The start of the movement of the WheelRE is fixed by the stop C, and it :is :retumied ato start position under the:action miesp1ing :SR. If :the dashreceived lasts more than :fiVe seconds, the wheel RT will stop rotating sincTe iitLi arrestecl by its stop b which bears theri :agaiiist the inner edgeof support 50. Wheel LRE likewise stops tuming for a silence longer ;han two seconds.

The

springs

100 and 101 bring the supports 50 and 51 respectively *back ito the Lpositicn of rst When the relays MN and SL respectively are dead.

'-f the second or third flash receiVed is too short; that is, cver -cne second in lcngth but lless than about three seconds, the support :50 imparts a plus te thelower :contact piece :of-con tact ;5 thej contact 19 being Lthen closed- (the W'inding 20 of relay '1C :having been energized -by -way 'of 18 and b'eing slow-acting does not open at once When the contactz5' leavesfltsupper contact piece), the relay :Z0 sreceiVes plus by means of the Iines LR, contact 19 and LZ and -energizes the .rlays:Ez and AE2 :and swltchcs the line L3 t0 L4; the .third correct :dash :energizes the relays Es and AE3 arid-zcloses tlre-rcircuit ofthe -bell relay "with :its lilocking cconLtact :and contact ll(i,"tnerebyrcloslng the circuit :ofcthe .bll SN WhiCh"Will continue to ring :untilzit sis :stopped'b epeningcontact 15 in any desiredmanner. The seleCtor S automatically -brought baok ito :zero :by :the ifirst silence excceding the Hduration -'or the first false sigi1al0lloufirg the losing of the bell circuit. 'll'ihe'relay then functionstbyvirtue of the closing action oi contact 31?, .19 or according ito "the case, 2andficflts ioi the 'energizingcf all therelays, Withthe exception of the bell circuit Which cOirtifiuesto function'until the moment the contact 15 is opened. .Opening cf contact L5 may 'be accomlishedby: a push button contact PB abetween the slecter :and 15. the line to .15 'is broken by PB :relay .AE3 becOmes deenergized and contact 16 opens to silence 'th'e bell. r p I The Whel A -1'nay rotate either in {constant manner*driVefibya motor or"b--a 'clock movement, or*o rily at the:momentof the reception of the signals. "ln-this lattercase'the movement of the =whel'-A'is controlled, ither by-the keying relay When MN, or by thesilence rela SL or again by a relay connected in series in a line common to the circuits of these two electromagnets.

Fig. 2 jillustrates 'this latter embodiment. The Wires connected to contacts 22 and of Figure 1, insteaclof running directly to the negative pole of the battery as shown on this figure, are connected with each other and run to one of the terminals of relay C1 whose other terminal is supplied by the negative. This relay controls a contact 23 which Closes the circuit of a motor M driving the wheel A. 'It-may also be the means for efiecting the engagement of this wheel on a driving shaft. When signal 'energy comes in, at 56 contact .L closes and MN is energized in the same manner as in the modification of Figure 1. At the saine ftime Cl 'is energized through the circuit Ciy, -and M and Astarts to rotate at the same time lever engages RT with A.

The constants of the -duration 'of the dashes and the intervals may' bermodified by the modification of lthetdimensionsor speeds ofwheels PRT or RE. .In similar manner the number of :elements or the recording:group may be modified for instance for the purpose of receiving signals composed of more than or less than three consecutive dashes.

l. Selective signaling.apparatuscomprising :indicatingmeans, recorcling means ;for :actuating the indicating means' after the reception of :a defihite number of correct signals each of Whi0h has a duration fixed between two minim'umand maximum limitsidentical for all the-signals, the signalsbeing separated by intervals which=doznct exceed.a definite .duration; a return-to zero relay connected with the said recording means, :a slowerleasing Inreliminary relay With two coils Wound in opposition Controllinga contact in the return-to*zero relay circuit, a rotary element, means controlledby the signalTor-causinguni- .form movement of this-element in adefinite direction:and for simultaneously opening :another contact in the return-to-zero circuit .in -series with the ;first contact; and three contacts actuated =by the r0tary:element =during its -uniform movement, the first of these contacts being actuatedat the tmoment when thesignal exceeds a limit which is fixed in advance,-this first contact beingconnected to one Winding of the.preliminary relay, thesecond of these contacts beingactuatedat,the moment when the signal exceeds-the minimum limit of the correct signals and:being connected ,to-the second winding of the preliminary:relay and with the recordingmeans, and the .third of these contacts being .actuated at the *moment When the signal;exceeds the maximum 'limit of the correct -signals, -this contact being connected with the return-to-zero :relay to cause operation thereof independent of the slow-releasing relay.

2. "SelectiVe signaling' apparatus comprising=indicating means, recording means for actuating.the indicating means after the reception of a-definite :number of.correctsignals each of which-hasa duration fixed between two minimum and maximum limits identical for all the.signals,the sig- :nals being separated hy intervals which do :not exceed a definite 'duration; a returnto-zero:relay connected to the saidxrecordingmeans, a-slowreleasing preliminary relay with two coils =wound in opposition .controlling a contact in the oircuit of the return-to-zero relay,- a rotary element,

meths controlled by the signal forcausingzuni- 23 closes the circuit throughform movement of this element in a definite direction and for opning at the same time another contact in the return-tO-zero circuit in*series With the first contact, and three contacts actuated by'the rotary element during its uniform movement, the first of the three contacts ,being actuated at the moment when the signal exceeds a limit which is fixed in advance, this first cori tact being connected toone winding of the preliminary relay, the second of these contacts being actuated at the moment when the signal exceeds the minimum limit of the correct signals and being connected with the second winding of the preliminary relay and with the recording means, and the third of these contacts being actuated at the moment when the signal exceeds the maximum limit of the correct signals, this contact being connected with the return-to-zero relay to Cause operation thereof independent of the slow-releasing relay, a second rotary clement, means, controlled by the silences following the firstcorrect signal, for causing uniform movement of the second rotary element in a deflnite direction, and a contact, actuated by the said second rotary element at the moment when the silence exceeds the set limit, said contact being connected with the circuit of the -returhtozero relay.

3. In a selector apparatus responsive t0 a series of signal impulses of given duration, means for measuring the length of the receivedimpulses comprising a displaceable member, a plurality of contact devices arranged in the path of displacementof said mmber and at predetermined distances from each other, means responsive to the signal impulses for .displacing said member .along it s path to successively actuate gized and for associating said second mentioned contact.device With'th third relay, an alarm associated with the third relay device, means for restoring the second and third relay devices, and means controlled by said slow releasing relay when not conteracted by the closure of the second mentioned contact device in combination With means controlled by the termination of the impulse when the impulse is of duration between the first and second gien duration for operating said restoring means. r

4. The systemas claimed in claim 3, in combination with.means responsive to a signal lasting longer than the first mentioned duration for operating said restoring means.

LOUIS LUCIEN EUGENE CHAUVEAU