US1993486A - Telephone repeating apparatus - Google Patents

Telephone repeating apparatus Download PDF

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US1993486A
US1993486A US673545A US67354533A US1993486A US 1993486 A US1993486 A US 1993486A US 673545 A US673545 A US 673545A US 67354533 A US67354533 A US 67354533A US 1993486 A US1993486 A US 1993486A
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contact
relay
current
frequency
telephone
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Ricchiardi Pier Carlo
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/02—Separators
    • B03C7/08—Separators with material carriers in the form of belts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/652—Means for playing back the recorded messages by remote control over a telephone line

Definitions

  • My invention relates to phone repeating apparat to a device whereby it is possible to receive and deliver messages in the absence of a party. at the receiving end'of a telephone installation.
  • One of the objects of my invention is to provide an apparatus which functions automatically to raise the receiver hook upon receipt of a signal, and by means of associated electrical and mechanical apparatus, to invite the party calling to leave a message and to deliver a desired message to that party and none other.
  • Another object of my invention is to provide an apparatus which may be associated with the ordinary dial telephone installation to carry out the above-mentioned objects without necessitatinga change in the installation, i. e., it is to liver to him the message I of electrical impulses and (i. e., what is commonly known number, hence for all supplement and not to replace the installation,'
  • Another object of my invention is to provide an arrangement which will permanently record incoming messages automatically at the will of the receiving party, regardless of whether or nothe is present at the time.
  • - still another object is to-provide an apparatus which maybe used not only to permanently record speech from another telephone, but may also be used to provide a permanent record of material dictated to it.
  • the invention makes use of what is commonly called the Poulsen type of recording or electromagnetic recording of variable electrical currents on a moving wire. This, of course, it merely my preferred form of recording and reproducing I may substitute just optical engraving as sound on film recording)
  • the engraving system per se is not the invention, hence my specific showing without modification in conjunction with my invention.
  • the apparatus is so arranged that when an electrical signal is received at the receiver (usually the bell signal), the receiver hook is automatically lifted to place the apparatus in an operative condition.
  • the person calling hears a socalled general message which informs him of the absence of the receiving party.
  • the person calling dials on a second provided dial his own specific code .number, this dialling serving to condition the apparatus'to dethat has been left for him. by the absent party.
  • Strangers calling would have only one chance out of a large number of thousands of dialling the correct code practical purposes the prias easily gramophone discs of improvements in teleand more especiallyceive and record any message conductor 10, relay 11 and vate message may not be intercepted.
  • the apparatus is conditioned to rethe caller may choose to leave.
  • a normal automatic telephonic appartaus 2-3 are the lead wires oi the telephone line, 4 is the telephone receiver including the telephone and the ally detached from hook 5.
  • the current passes in the known direction through the circuit of the telephonic recei, er and actuates the bells, thus causing them to vibrate.
  • arm 5 will have reached the end of its course thus applying contact 31 (connected to ground 33) against contact 32. This will close a circuit comprising grounded negative terminal 33, contact 32, wire 34 and motor 35, and a grounded source of potential. Motor 35 thus energized will begin to run.
  • Telephone lines 2-3 are now in contact with the arms 38-39 of switch 40 through conductors 36-37. If said arms 38-39 are now brought against contacts 41-42, the apparatus, through conductors 43-44, works as an ordinary automatic telephone, use being made of the telephone microphone system 4.
  • the owner of the telephone installation has to leave, and only in this case, arms 38-39 are applied against contacts45-46, the circuit of the line then passing through contact 45, conductor 47, primary 48 of a transformer, conductor 49, secondary 50 of another transformer, conductor 51 and contact 46, which is connected to the telephone line.
  • The'four arms 52, 53, 58, 59 of switch 40 enable the receipt of telephone conversation through a loud speaker and for transmitting through a table microphone,'so as to allow a communication without it being nec essary to kep the telephone combined receiver and transmitter in hand. This is the desirable hookup when the person that is called is present.
  • switch arms 38, 39, 52, 53-58, 59 are applied against contacts 45, 46, 56, 57 and 60-61 respectively.
  • a pulsating or alternating current of speech frequency flows through the telephone line.
  • the current flows through the primary of transformer 48.
  • This passage of current will induce in the secondary 48bis, a current which, by energizing the grid of amplifying tube V1, will produce an amplified current flowing through the primary of transformer 64 and through the conductors 22, 23, 24 into the windings of retarded relay 25 (thus energizing it as already explained) and from said windings to the positive terminal of the supply battery.
  • the current from the line thus ampli-v fied will induce in secondary 65, a current which, on one side of conductor 66, flows to arm 52, and, on the other side, flows through conductor 67 through the windings of a relay 68, conductor 69, electro-magnet 70, conductor 71 and arm 53. If, as already explained, the person that is called is present, the two arms 52-53 are applied against contacts 54-55; the current from the line (the conversation from the caller) after the amplification above described, will be reproduced by loud speaker 72. If, on the contrary, arms 52, 53 are applied against contacts 56-57, the apparatus will be in position for electro-magnetically recording the words of the caller.
  • the person that is called may answer by means of the microphone.
  • the two arms 58-59 are then applied against contacts 62-63.
  • the currents set up by microphone 73 are conveyed to the transformer 74, and a current will flow through the following circuit: conductor 75, contact 63, arm 59, conductor 80, the primary winding of transformer 79, conductor 78, arm 58, contact 62, conductor 76 and the secondary of transformer 74.
  • the current flowing through the primary of transformer 79 will produce in the secondary thereof a current that will energize the grid of the amplifying tube.
  • the amplified current will flow from the plate through the primary of transformer 50 through the positive terminal of the supply battery to ground.
  • the amplified current induced in.the secondary of transformer 50 flows through the following circuit; arm 38, contact 46, conductor 51, secondary of transformer 50, con ductor 49, conductor 47, contact 45 and arm 39, it having been explained that arms 38 and 39 are connected to the line.
  • the current set up by the microphone will thus beamplified and sent directly into the telephonic line. All this, as already stated, takes place when the person that is called is present. In the case of his absence, now considered, the two arms 58-59 will have been brought against contacts 60-61 and the currents set up in the coils by the passage of the magnetized wire between them; will replace those produced by the voice in microphone 73.
  • the shaft of motor 35 is rigidly connected with the spindles of spools A, 91A, 86A, 86B, 86C, 86D, 86E and spools 85B, 91B, 87A, 87B, 87C, 87D, 87E, through mechanical coupling means that are not illustrated for the sake of simplicity of the drawings.
  • These spools are each rotated through frictional means so that while one of them is being rotated, for in tance, the others are stopped by a stop tooth as willbe hereinafter explained. however, for the sake of clearness, the drawings do not show the mechanical organs that permit of rewinding the steel wire when the wire has been completely unwound from one spool and is wound around the corresponding spool.
  • Spool 85B is wound with magnetic steel wire that has not been already engraved, the wire passing between the cores of electro-magnets 88-89 and winding itself on spool 85A.
  • spools 87A, 87B 87E sponds to a message engraved on its wire, which, 9'7, armature 94, conductors 121 and 122, and the passing "between the cores of electro-magnets windings of electro-magnets 88-89 88-89, will then wind around corresponding The currents thus induced by the passage of the spool 86A, 86B 86E.
  • spool wires containing the electro-magnetically re- 91A is wound with a wire on which has been recorded message dictated in advance, will flow corded in advance by magnetic engraving, a senthrough the primary of transformer '79, and intence, which, for instance, notifies for instance cute in its secondary currents that will be amplithe caller of the absence of the person that is fed by tube V2, and conveyed to the telephone called, invites him to transmit this message and line through the circuits previously described. to dial the code number or key number for re- If, while this message is being delivered by the DCving the message dictated by the person that is apparatus that has been called, the caller hapnow being called, in the absence of said person.
  • This message which has been electromagnetion electro-magnets 88--89 of the speaking cally engraved on the wire wound around spool oup b caus o the Opening of the contacts o 91A, isdelivered to anyone that calls this installaay 9 e d o th Circuit of amplifying es ture 107, said armature being rigidly connected to Pene contacts 94-497 and 593-98 -conductor 103, armature '7, contact 108, conduction, and is wound between spools 91A--91B in Y1-V2.
  • the appara- Electra-magnets 89-3 diagramatically form tus is automatically brought into its receiving pcth alled Pom m speaking group As sition as will be hereinafter explained. matter of fact, for practical purposes, the electro- A r u i bar 114A 114E slides on each magnets are of a different form and are four or Spool respeetively- It represents diagrammatisix in number instead of two.
  • t tacts.104 and 125 when the desired portion of the has be n sho diagrammatically Th one wire that was wound around spool 91A has been may rovid ithe Speaking group for each transferred to spool 91B.
  • This portion of wire 5 3001, or one common t ,11 t Spools, t mag corresponds to'the length of the sentence to be netic wires being positioned so as; to pass the transmitted, and theedjustment of this p t n magnet eeres side by Side is effected by suitable cooperation with bar 114.
  • This relay 25 will at- Once delivered, is to be wound. not on po 91B.
  • Electro-magnet 127 will therefore be ener ized, tors 109, 110, 1 12, winding of relay 92 and posiand will attract Step teeth tive terminal 113.
  • Relay 92 is energized and Motor 35 is Still revolving, and $11001 ethus attracts armatures 94-93 (which are rigidly leased by step teeth 133 and frietieneny driven connected to each other) and fdices against the shaft of Said mOtOl, turn and thus contacts 7 reshective1y on its periphery, the wire that was wound around The wires of spool 91A, magnetized in advance corresponding $1,001 by the well .kn "Poulsen ff t, by passing As it has been stated, this wire has not yet been between the cores of electro-mggnets 3 111 magnetized and by passing between the cores of produce a variation of the magnetic field genereleetlo-megnete 83-439 When the current from.
  • the two armatures 9493 thus released will make contact with contacts 95-96 respectively, thus closing the receiving and recording circuit which comprises electro-magnet 88 (which now acts for recording), conductor 121, armature 94, contact 95, conductors 118 and 136, contact 56, arm 52, conductor 66, secondary of transformer 65, conductor 67, winding of relay 68, conductor 69, relay70, conductor 71, arm 53, contact 57, conductor 137, contact 96, armature 93, conductors 117 and 116, winding electro-magnet 89, conductor 123 and electro-magnet 88.
  • electro-magnet 88 which now acts for recording
  • the current that flows through said electromagnets and therefore the flux between the cores of saidelectro-magnets, will vary proportionally to the variations of current in the telephonic
  • the motor, the relays, and all the other apparatus therefore assume their normal positions.
  • the relay 144 that is thus fed will attract its armature 145.
  • the latter is in turn rigidly connected with hook 5 through bar 147.
  • hook 5 By lowering armature 145, hook 5 will be lowered, and by rubbing against armature 13 of relay 11, .it will be locked under said armature, therefore remaining in this lower position.
  • armature 145 As armature 145 is rigidly connected to hook 5, it will also remain in its lower position, and accordingly contacts 144-445 through which pass the current of relay 142, will be opened.
  • the problem for the caller is to operate among spools 87A 87E, the one that will transmit the message left for him by the person that he calls, and who is absent.
  • Each apparatus is provided with a dial 02 exactly similar (as for its working principle) to that of the automatic telephone apparatus C1.
  • the presence of this second dial C2 is due to the fact that it is desired to avoid any modification of the equipment that comprises a telephone installation, so as to permit of being wholly independent of said installation. It is obvious that, if this consideration is considered unimportant, it is possible to use the same telephone dial by utilizing a suitable switch without changing the principle of this invention.
  • This idal C2 which is the same as those used for automatic telephones, has on its outer periphery a number disc 212 with corresponding holes for introducing the finger therein, and causing it to rotate it as far as a stopping tooth (not shown in the drawings) when it is desired to close contacts 216-217, a certain num er of times.
  • Relay 220 is energized
  • the displacement of part 213 is obtained through a toothed wheel 210 having ten teeth corresponding to the figures of the disc, and the toothed wheel is caused to rotate, not directly when numbered disc 212 is rotated by hand, but by means of a spring which in turn will rotate th toothed wheel by a number of teeth equal to the number corresponding tothe hole in which the finger was inserted.
  • roller 211 carried by bar 213 will move over the outline of the toothed wheel, and therefore is number 3 for instance is dialed, three teeth will pass on roller 211 thus imparting three'pulsations to bar, 213, thus closing contacts 216-217 thrice.
  • this closing of the contacts takes place through the intermediary of a spring, and during the backward rotation of numbered wheel 212.
  • a small bolt 200 is brought against crank lever 202 which is pushed downwardly by pivoting about a point 204, and causes arm 203 to apply contacts 205-206 against each other.
  • small bolt 200 will move past said bell crank lever 202.
  • bolt 200 will merely raise lever 202 without pushing it against contact 206.
  • this blade As this blade is so chosen as to have its frequency of oscillation in the range of audio frequencies, it will oscillate in the magnetic field produced by coil 301 within which said blade is located.
  • This magnetic field is produced by the constant current flowing from positive terminal 307 into the primary of transformer 306, conductors 305-228, coil 301, conductor 303 and,
  • This permanent magnetic field will'therefore vary in accordance with the vibrations of armature 227, that is F1, which is the natural frequency of oscillation of plate 227.
  • numbered wheel 212 will be rotated so that number 5 is brought against the stop tooth, thus causing the armature 227 to vibrate at a frequency F1, and this will cause a current of a frequency'equal to F1 to flow to say at a constant frequency therefore clear that, for.
  • electro-magnet 222 will attract its armature 226, whichwill in turn oscillate at its natural frequency.
  • transformer 306 When number 4 is then dialed (the key number cited by way of example being 54322.),there is produced in transformer 306, first a pulsation of current at a frequency F1, and then four pulsations at a frequency F2; when number 3 is dialed there is a pulsation at a frequency F1 and then three pulsations at a frequency F2. When each of the numbers 2 is dialed, there is first a pulsation-at a frequency F1 and then two pulsations at a frequency F2.
  • Each element carries, at its periphery, ten contacts (from zero to nine) on which can frictionally move one brush for each element (500A, 5003, 5000, 500D, 500E) for example, for the sake of clearness of the drawings, have not been indicated by a number in the successive preselectors.
  • These brushes are rigidly carried by spindles 460, 461, 462, 463, 464.
  • Each spindle is controlled by a relay (144A, 1443, 144C, 144D, 144E) which, for each pulsation of current that passes through it, will attract its respective armatures 145A, 1453, 1450, 145D, 145E.
  • Each of these armatures engages by its hooked end between teeth carried by the spindle of the preselector and its displacement will cause the corresponding brush 500A 500E to rotate through an angle corresponding to one tooth, one of the contacts disposed on the periphery of each element of the preselector being correspondingly rotated.
  • Each message will be characterized by the starting of one element of each preselector. For the first message, there will first be brought into action the element 447A of the first preselector, the element 448A of the second preselector, the element 449A of the third selector, the element 450Aof the fourth selector, and the element 451A of the fifth selector.
  • plugs 452A, 453A, 454A, 455A, 456A are movable, and each of them can be fixed on one of the ten contacts disposed along the periphery of each element and of each preselector.
  • Plug 452A will be fixed on one of the ten'contacts of element 447A, plug 453A on one of the ten contacts of element 448A, etc.
  • Each of these plugs is connected to a brush rubbing against a ring on which is fixed the rotating brush, electrically insulated from the spindle by which it is driven.
  • plug 452A is connected to sliding contact 501A of the first element of the second preselector; plug 453A is sliding contact 502A of the first third preselector; plug 454A is connected to the sliding contact 503A of the first element of the fourth preselector; plug 455A is connected to contact 504A; and plug 456A is connected to conductor 520A.
  • the key-number is defined by the position of plugs 452A 452E, 453A 453E, 454A 454E, etc., on the contacts of the respective elements of the preselector.
  • plug 452A has been placed in advance on contact number 5 of element 447A; plug 453A has been fixed on contact number 4 of element 448A; plug 454A has been fixed on 449A; plug 455A has beenfixed on contact number'2 of element 450A; and plug 456A has been fixed on contact number 2 of element 451A. All the rotating brushes are in their position of rest contact number 3 of element on the zeros. There will now be explained how the message characterized by key-number 54322 isselected and transmitted.
  • the first pulsation of current at frequency F1 coming from the telephone line will flow,- through the conductors mentioned in the preceding description,'to contact arms 38-39. This current will flow through contact 46, conductor 47, primary 48 of transformer 4848bis, conductor49, secondary 50 of another transformer, conductor 51,- brush 38, and from there to the telephone line.
  • Electro-magnets 68 and 70 will therefore be subjected to a pulsation of current at a frequency F1.
  • Vibrating blade 401 contacting with 405 will close the following circuit; negative terminal 403. vibrating blade 401, contact 405, conductor 406, electro-magnet 407 and positive terminal 408.
  • the electro-magnet 407 thus energized will attract its armature 410.
  • This armature is engaged by its hooked end 143 in the teeth of a toothed wheel 411 so that its attraction by electro-magnet 407 will cause said toothed wheel 411 to rotate through an angle corresponding to one tooth.
  • blade 400 Under the effect of the phenomenon of resonance, will be brought into contact with 402, whereas 401, which is not tuned to resonance, cannot be brought into contact with 405.
  • blade 400 comes into contact with 402 and closes the following circuit: negative terminal 403, blade 400, conductor 402, rotating brush 404, brush 1'30 (now applied against contact 142A) contact 142A, conductor 600A, electro-magnet 144A and a positive terminal.
  • the contact 400-402 will be closed five successive times.
  • Relay 144A will thus be energized five times, and it will attract its armature 145A five times.
  • Armature 145A will therefore cause spindle to rotate through an angle corresponding to five teeth, thus bringing brush 500A with which it is rigidly connected, onto contact No. 5 on which has been placed plug 452A.
  • the calling telephone installation will then transmit a pulsation at frequency F1, and four pulsations at frequency F2 successively.
  • said relay will then attract its armature which, through its hooked end 143, will displace brush 130 and thus bring it on to contact 14213.
  • the four pulsations of current at frequency F2 are then received, and close four times contacts 400-402.
  • Electro-magnet 144B will thus receive four pulsations of current through the circuit already described and the brush of element 448A will accordingly be brought on to contact No. 4 on which is fixed plug 453A.
  • a third pulsation of current at frequency F1 will now be received.
  • the brush 130 of the distributor will be brought onto contact 142C.
  • Three pulsations of current at frequency F2 will then be received, and by actuating electro-magnet 144C, they will bring the brush of element 449A of the third preselector onto contact No. 3 on which is fixed plug 454A.
  • a fourth pulsation of current at frequency F1 will now be received, and after it two pulsations of current at frequency F2 will also be received.
  • the pulsation of current at frequency F1 will of the distributor to move forthus coming onto contact 142D.
  • the two pulsations of current at frequency F2 will cause, through electro-magnet 144D, the brush of the first element 450A of the fourth preselector to come onto contact No. 2 on which is fixed plug 455A.
  • plugs 452A, 453A, 454A, 455A, 456A on contacts Nos. 5, 4, 3, 2, 2 of the first element of each preselector respectively.
  • the following circuit is closed: positive terminal 446A, brush 510A, contact No. 5 (onto which the brush has been brought) plug 452A (fixed before hand on contact No. 5), brush 501A, rotating brush of element 448A, contact No. 4 (onto which the brush has been brought), plug 453A (fixed before hand on contact No. 4) sliding brushes 502A, rotating brush of element 449A, contact No. 3 (on to which the brush has been brought) plug 454A No. 3) sliding brush 503A, rotating brush of element 450A, contact No. 2, conductor 455A, sliding brush 504A, rotating brush of element 451A,
  • contact No. 2 plug 456A (fixed beforehand on contact No. 2) conductor 520, relay 610A, conductors 612A-613A, contact 614A, control bar 1143 and negative terminal 615A.
  • Electro-magnet 610A thus energized, will attract its armature 620A which is-integral with stop tooth 618A of spool 86A. leased by its stop tooth and driven through frictional contact with the shaft of motor 35, will begin to wind the wire containing the magnetically recorded message wound about the corresponding spool 87A, thus transmitting the mes-, sage intended for the calling telephone installation, this message being dictated in the same way as above described with reference to spool It is therefore obvious that a mistake in a single'figure, in the dialing of the key-number, will cut the circuit above described so that the transmission of the message will not be possible.
  • control bar 114B is raised as previously explained. This will out oi? the negative terminal 615A from relay 610A so that the armature 620A and consequently stop tooth 618A will be released, thus stopping the rotation of spool 86A.
  • the armature 620A by being released, ceases to be in contact with 621A, and thus cuts ofi the current flowing to relay 92.
  • the armatures 93-94 of this relay are thus released, and condition the apparatus so that it acts as a receiving and recording system.
  • Stop tooth 618A which is permanently connected to the positive terminal at 622A now connects this contact 623A to said positive terminal.
  • control bar 114B When control bar 114B is moved away from contact 614A, it comes into contact with 616A and thus closes the following circuit: negative terminal6l5A, control bar 1143, contact 616A, conductors 617A-630, 126, relay 127, conductors 128, 626, 625A, contact 623A, stop tooth 618A and positive terminal 622A.
  • Relay 127 will thus attract its armature (stop tooth) 133 thereby releasing the recording spool 85A which winds the magnetically recorded wire after it has received the answer from the calling telephone installation.
  • the combination with a telephone installation having a signal box and a normally depressed rec iver hook, of means associated with the receiver hook for automatically lifting the latter on the signal being received, an electric motor, means associated with the receiver hook for starting the motor on the book being lifted, a telegraphone electrically connected to the telephone circuit, a plurality of record carriers operatively associated ,with said telegraphone for transmitting and receiving messages over the telephone circuit, means for operatively joining one of said record carriers with the motor on the receiver hook being lifted for the transmission of a general message, selecting means operable by the caller over the telephone circuit for operatively joining another record carrier with the motor for the transmission of a special message, means for operatively joining a third record carrier to the motor for recording a message transmitted by the caller, means controlled by the speech current for maintaining the device operative, and means for restoring the receiver hook to depressed position after the speech current ceases.
  • the device claimed in claim 1 in combination with a loud speaker, a microphone, and a switch for connecting said loud. speaker and microphone to the telephone circuit instead of the telegraphone.
  • the device claimed in claim 1 in combination with a microphone, and a switch for connecting said microphone to the telegraphone.
  • connection between the bell box and receiver hook comprises an electric circuit including the bell clapper, contacts in said circuit through which the latter is closed when the clapper is operated, a catch holding the receiver hook normally depressed, and a magnet in said latter circuit for operating the catch and releasing the receiver hook.
  • a device as claimed in claim 1 wherein the means for maintaining the device operative comprises an electric source, a retarded relay, means operated by the lifted receiver hook for initially energizing said relay through the source, means controlled by said relay for maintaining all the electric parts of the device C011? nected to the positive pole of the source, and means for passing the speech currents through the relay.
  • a device as claimed in claim 1 wherein the means for maintaining the device operative comprises an electric source, a retarded relay means operated by the lifted receiver hook for initially energizing said relay through the source, means controlled by said relay for maintaining all the circuits of the device connected to the positive pole of the electric source, means for passing the speech current through said relay and means for amplifying said speech currents.
  • the device claimed in claim 1 in combination with a switch for connecting the device to the telephone circuit instead of the ordinary telephone receiver.
  • a device as claimed in claim 8 wherein the means for arresting the spools comprises pivoted catches and wherein the means for releasing the spools comprises electro-magnets adapted to operate said catches.
  • the device claimed in claim 8 in combination with a switch for changing over from reception to transmission and vice versa, an electro-magnet for operating said switch, and means associated with the spool arresting and releasing .means for energizing and de-energizing said electro-magnet.
  • a device as claimed in claim 8 wherein the receiving and re-arresting means controlled by the receiving spools comprises in each case a switch lever bearing against and operated by the record carrier.
  • the selecting means comprises a dialling disc, means for producing electric impulses by the rotation of said disc, a series of rotatable switch elements, and means operated by the electric impulses for setting said switch elements.
  • a device as claimed in claim 8 wherein the selecting means comprises a dialling disc, means for producing electric impulses by the rotation of said disc, a series of rotatable switch elements, means operated by the electric impulses for rotating said switch elements, and contacts co-operating with said switch elements and adapted to be electrically connected in different manners for determining the selection of a message.
  • the selecting means comprises a selecting circuit, a dialling disc in said circuit, means operable by the disc for producing electric impulses in said circuit at two difierent frequencies, means operable by the impulses of one frequency for selecting a set of switch elements, means operable by the other frequency for rotating-said set of switch elements, and contacts co-operating with said switch elements and adapted to be interconnected in different manners for determining the selection of a message.
  • the selecting means comprises a selecting circuit, a dialing disc in said circuit, means operable by thedisc for producing electric impulses in said circuit at two different frequencies, a preselector in said circuit, a series of rotatable switch elements, means operable by the impulses of one frequency for connecting the preselector electrically with different sets of switch elements, means operable by the other frequency for rotating the switch elements, and contacts co-operating with said switch elements and adapted to be interconnected in different manners for determining the selection of the message.
  • the selecting means comprises a selecting circuit, a dialling disc in said circuit, means poerable by the disc for producing electric impulses in said circuit at two different frequencies, a pre-selector in said circuit, groups of coaxial rotary switch elements, means operable by the impulses of one frequency for connecting the pre-selector electrically and in succession with the diiferent groups of switch elements, means operable by the other frequency for rotating the switch elements of each group through a given number of steps, and contacts co-operating with said switch elements and adapted to be interconnected in diflerent manners for determining the selection of a message.
  • a device as claimed in claim 8 wherein the means for restoring the receiver hook to depressed position comprises a magnet, an armature for said magnet connected mechanically to the hook a circuit for said magnet including the armature and a contact against which the armature bears when the hook is in raised position, and means released by the retarded relay for passing current through-said magnet circuit when the relay becomes de-energized.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
US673545A 1932-06-11 1933-05-29 Telephone repeating apparatus Expired - Lifetime US1993486A (en)

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IT421059X 1932-06-11

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US673545A Expired - Lifetime US1993486A (en) 1932-06-11 1933-05-29 Telephone repeating apparatus

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US (1) US1993486A (en, 2012)
BE (1) BE421059A (en, 2012)
FR (1) FR756725A (en, 2012)
GB (1) GB421059A (en, 2012)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472435A (en) * 1946-10-09 1949-06-07 Automatic Elect Lab Wire recording system
US2539139A (en) * 1949-07-14 1951-01-23 Jordaphone Corp Of America Telephone system for automatic answering, recording messages, and recording normal conversations
US2784254A (en) * 1951-01-05 1957-03-05 Lane John Dexter System for telephone answering and recording and for message recording and reproducing
US3212059A (en) * 1955-07-29 1965-10-12 Walter G Finch Pulse responsive drum control and readout circuit
US3600517A (en) * 1968-05-06 1971-08-17 David M Goodman Dial pulse decoders

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE756501C (de) * 1938-12-01 1954-10-11 Mueller Willy Anordnung zur Fernsteuerung eines Telephonographen
DE856621C (de) * 1939-02-12 1952-11-24 Schallband Syndikat A G Vorrichtung zur selbsttaetigen Aufnahme von Telefongespraechen
US3286033A (en) * 1960-08-30 1966-11-15 Jerome H Lemelson Apparatus for magnetically recording and reproducing at a remote station over a telephone line
US3443032A (en) * 1965-06-19 1969-05-06 Nippon Electric Co Control system using continuous tone and pulsed code signals
US3684834A (en) * 1970-07-10 1972-08-15 Audrichron Co The Apparatus for remotely changing the message of an automatic announcing machine
US4122306A (en) * 1975-11-24 1978-10-24 Jacob Friedman Telephone answering apparatus providing selective message communication
JPS5342609A (en) * 1976-09-30 1978-04-18 Hashimoto Corp Automatic answering telephone system with remote control using multichannel recorder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472435A (en) * 1946-10-09 1949-06-07 Automatic Elect Lab Wire recording system
US2539139A (en) * 1949-07-14 1951-01-23 Jordaphone Corp Of America Telephone system for automatic answering, recording messages, and recording normal conversations
US2784254A (en) * 1951-01-05 1957-03-05 Lane John Dexter System for telephone answering and recording and for message recording and reproducing
US3212059A (en) * 1955-07-29 1965-10-12 Walter G Finch Pulse responsive drum control and readout circuit
US3600517A (en) * 1968-05-06 1971-08-17 David M Goodman Dial pulse decoders

Also Published As

Publication number Publication date
GB421059A (en) 1934-12-10
BE421059A (en, 2012)
FR756725A (fr) 1933-12-14

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