US2830241A - Telecontrol device - Google Patents

Description

pr 1958 A J. TURCK 2,836,241

TELECONTROL DEVICE Filed July 20. 1955 4 Sheets-Sheet 1 /N VE/V TOR JEAN TURCK By fg /wuylsl/u-,7

A T TURA/E YS April 9 1958 J. TURCK 2,830,24

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ATTORNEYS pr 8, 1958 J. TURCK 2,830,241

` TELECONTROL DEVICE Filed July 2o, 1955 4 sheets-sheet 4 /N VEN 7'0/47 LSE JEAN TUHCK 2,830,241 TELECoN'rRoL DEVICE n Jean Turck, Cachan, France n c Application July zo, 195s, serial No. 523,250 Claims priority, application France July 21, 1954` 8 Claims. (Cl. S18-16) l This invention relates to a telecontrol device so de- :igned as to permit, by the emission of control signals )f different frequencies, of bringing a moving component :for'instance the moving contact of a swit-ch) placed at t distance from the point of emission of said signals, into relected positions, each of which corresponds to a deyermined frequency of a control signal.

' The new device is characterized by the fact that, as vhe sender is arranged so as to emit signals each of which s characterized by a well-determined frequency modulaion, the receiver comprises a frequency detector which, hrough a switch successively making circuits with diifer- :ntly tuned frequencies, the number of which corresponds :o that of the positions to be given to the moving tele- :ontrolled component, can be set on each of the various frequencies produced, and controls the switching-on and twitching-oft of an electric motor positively connected to heV brush of the switch associated with the frequency letector, on the one hand, and to the said moving comlaonent, on the other hand, the arrangement being such hat for each signal emitted at a given frequency, the noving components of the receiver (moving brush of the :witch of the frequency detector and moving telecon- Lrolled component coupled with said brush), tend to :ome into a position for which no control voltage occurs 1t the output terminals of the frequency'detector and for which the electric motor is therefore out of action.

In a preferred embodiment of this device, the latter is more particularly characterized by the following features and combinations thereof:

The frequency detector receiving circuits with differently tuned frequencies consist in a fixed coil (preferably the secondary winding of the transformer of the frequency detector) and in a series of condensers which are successively put in circuit by means of the switch;

- The electric motor is of the dual rotation type and to this end, it comprises two armature windings each of the supply circuits of which is controlled by a contactor relay which is itself controlled from one of the output terminals of the frequency detector;

A direct current amplifier chain connects each output terminal of the frequency detector to the corresponding :ont-actor relay;

f Each of the contactor relays also controls an electromagnetic brake of the motor, the said brake being arranged. so that its windings are` energized when the motor windings themselves are energized and so that the brake operates when its windings are not excited; When the moving component to be remote-controlled is the brush of a switch, the circuit of this brush is controlled by either of the two contacter relays yassociated with-the frequency detector, so as to be cut off during the ldisplacements of the said brush; v

When the signals are transmitted vby radio-electric chanthere are gpositious'on which the telecontrolled component aired; Staes Patent' p ice 2 is to be set, it being possible to'put each of these generators in circuit by a control contactor such as a switch;

ln front of the frequency detector, the receiver comprises a symmetrical amplitude limiter to which the signals corresponding to the control frequencies are applied after detection.

Other features and characteristics of the invention appear in the following description which relates to a specimen embodiment of a telecontrol device, the said example being given merely by way of illustration and said embodiment being diagrammatically shown in the accompanying drawing in which:

Fig. 1 is a simplified diagram of the radio telecontrol sender; v

Fig. 2 is -a diagram of the outline of a telecontrol receiver device; v v

Figs. 3, 4 and 5 show the detailed wiring diagram of the receiving device assembly of Fig. 2 (points a and b on the left side of Fig. 4 correspond to points a and b on the right side of Fig. 3 and points c, d, and e, on the left side of Fig. 5 -correspond to points c, d and e on the right side of Fig. 4).

In Fig. 1A is a radio sender, the wave of which is modulated from the generators B1, BZ, B3, B4, B5, B5 and B7, which can individually be put in circuitby a Switch C which constitutes the remote control component.

In Fig. 2,' I is a frequency change receiver comprising a high frequency amplifier D, a frequency converter stage E, a medium frequency amplifier F, a detector stage G and a 10W frequency amplifier H with symmetrical output `anode circuit.

Following the radio receiver properly so-called l (at the outlet of which signals with the frequencies produced by the generators B are collected) is a symmetrical amplitude limiter Il, the purpose of which is to limit the amplitude of the signals to a predetermined value independent of the input amplitude.

The symmetrical amplitude limiter Il energizes a frequency detector III of a standard type but the input transformer secondary winding of which can be successively connected in parallel with seven condcnsers J, through a switch K, so as to permit of tune the detector to each of the control frequencies, and so that, once it,

has been tuned to the frequency which is then being emitted, no voltage is produced at its output terminals.

The frequency detector output terminals are connected to a direct current amplifier IV comprising two parallel chains of transmission lVa and lVb which controls a contactor unit V intended to control the switching-on and switching-olf of the motor VI, the direction of rotation of this motor, and the motor brake.

Through a speed reducer VII, the motor VI simultaneously actuates the brush k of the switch K and the moving component to be telecontrolled, the said component being here represented in the form of the brush l of a switch L.

The circuit of the brush l can be controlled by the contactor V so that this circuit is closed only when the motor VI is disconnected. v

The various parts briey described above and shown in Fig. 2 can be made in many different ways. The particular embodiment shown in Figs. 3 to 6 is given merely by way of illustration and has been designed for the control of a teleguided missile vehicle, etc. provided with a source of 24 volt low voltage direct current and with at least one source of high voltage direct current supplying the various anode voltages required by the thermionic tubes (for instance 133 v., 190 v., 270 v.).

The tuned circuit l connected to the receiving aerial 1a is coupled to a high frequency amplifier tube 2 which 'here is apentode (type UF ,41, for instance). This pentode is coupled, through a high frequency adjustable 2 .J transformer 3, to an oscillating-mixing tube 4 which produces a frequency change. This tube 4 here is a triode-hexode (type UCH 41, for instance) which at* tacks, by means of a medium frequency adjustable transformer 5, a medium frequency amplifier tube 6, here a pentode (type EF 41, for instance). Through the medium frequency adjustable transformer 7, the pentode 6 attacks a low frequency pre-amplifying detector stage comprising a double diode-triode 8 in the anode circuit of which is collected a current detected at the modulated frequency of the sender.

The anode circuit of the tube S comprises a coil 9 with medium tapping, the two ends of which (where opposite voltages are produced) control a symmetrical am-Y ing of this transformer being connected, through a condenser i2, to one of the two above-mentioned primary winding ends.

The two secondary winding ends of the transformer 111 are connected to the anodes of a double diode 13 (type EBC 41, for instance). The two above-mentioned secondary winding ends are also coupled with a series of condeusers Il, I2, I3, I4, I5, J5, I7 which can successively he put in circuit (in parallel, on the said secondary winding) by means of the hunting quadrant k of the switch K. The capacities of the various abovementioned condensers are such that, according to which ones of them are put in circuit, the frequency detector is tuned on one or the other control frequency produced by the modulators B1 to B7 of the transmitter (Fig. l). It is well known that such a frequency detector supplies no voltage to the output terminals X and Y of the tube 13 when it resonates to the frequency which is applied to it. On the contrary, as soon as the applied frequency is different from that on which it is tuned, a negative voltage (in relation to earth) will be produced, either at X or at Y, according to whether the applied frequency is greater or lesser than its own frequency.

Each of the output terminals X and Y of the frequency detector IH is connected to a direct current amplifier chain IV. Each chain comprises a pre-amplifying pentode 14 or 14a (type EF 41 for instance) and a power pentode i or iSa (type EL 42, for instance).

In the foregoing, the circuits (and the components such as condensers, resistances, coils, rheostats, potentiometers, etc. associated with these circuits) of the receiver have not been described in detail, as these circuits are more within the scope of radio technique and are well-known of technicians who will find the details thereof in Figures 3 to 5.

The anode circuit of each of the power tubes 15 and fSa comprises an energizing winding 16 (and 16a) of the contacter relay V comprising two series of moving contacts f7, 18, and 17a, 18a. The moving contacts 1'7 and 17a, connected to the power source of the motor VI, operate respectively in conjunction with the fixed working contacts t9 and i9a connected to the armature windings 20 and 29a of the said motor and to the windings 2i and Zia controlling the brake release of the said motor, the rotor of which (see Fig. 2) is connected, through a speed reducer VII, to the brush k of the switch K (associated with the frequency detector) and to the brush t of the telecontrolled switch L. The moving contacts 1S and 18a are series-connected with the resting contacts 22 and 22a in the circuit of the brush l.

The above-described device operates .in the following manner, it being understood that when it is stopped the motor is locked by an electromagnetic brake Br which is released only when one of the brake-release windings 21 or 21a is energized. p

'At the emission, when the brush of the telecontrol 4 switch C is brought onto one of the contact studs, the wave initiated by the sender A is modulated to Vthe frequency of either of the generators B1 to B7 which is connected to the circuit by the above-mentioned switch.

At the receiver, a signal is found, after detection, which has the same frequency as that initiated by the generator put in circuit at the emission.

If, in the frequency detector, thebrush k is in a position such that the value of the condensers J put in circuit causes the detector to resonate to the frequency in querian, voltage will be produced atthe detector output and the direct current amplifiers following it will not operate, so that the motor VI will be disconnected from the circuit.

The telecontrolled switch L, positively connected to the switch i, will be in a well-defined position which is precisely that which was to be given it by the control switch C of the sender.

if the brush k is not in the above-mentioned position, the detector is not tuned to the said frequency: a negative voltage will occur at either of its output .terminals (according to whether it resonates to a greater or lesser frequency than the frequency of the signal received).

t this point, one of the amplifier chains will come .into action to control the group of contactors associated with it, and the motor VI will rotate in the proper .direction to actuate the switch K until the frequency detector :is tuned te the frequency of the signal; during this opera tion, the switch L is also actuated. As soon as the frequency detector is tuned, it supplies no more output voltage and the motor, which is no longer energized,

stops underthe action of the brake Br which comes into ction as soon as the brake release windings 21, l21a are de-energized.

It will be noted that during the hunting motions of the switch K, the circuit of the switch L is cut off, which eliminates any control disturbance resulting from the said switch during the exploration of its contact studs.

For the automatic sensitivity control of the receiver, the latter can, as in receivers of known types, comprise an automatic gain-control device at which the :points -Z end (Figs. 3 and 4).

it goes without saying that the specimen embodiment of the telecontrol device described above `and shown -in the accompanying drawing is given merely .by way of illustration and is in lno way restrictive and that Tany detail changes can be made therein. For instance, 'the radio control could be a cable control.

What I claim is:

1. Telecontrol device comprising a transmitter vwhich can emit control signals with dierent frequencies and .a receiver having at least one controlled moving component which can be put in as many selected positions as the transmitter is capable of emitting different frequencies, each position of the said moving .component corresponding to one of the said frequencies, the'said receiver comprising: means for receiving control signals; a frequency detector with tuning circuit connected to the said receiving means and comprising several tuning components and a switch to switch any of the said vtuning` components in the said tuning circuit; a contacter .relay connected to the frequency detector `to be .controlled .by the said detector; a source of electric current; an electric motor of the dual rotation type connectableto the :said source of current and controlled by the said .contactor relay; transmission means to connect, operatively, the motor to the frequency detector switch and to the receiver moving component.

2. Telecontrol device according to claim 1, in which the said frequency detector comprises an input transformer and in which the tuning components are .fixed condensers of different capacities which can be coupled to the secondary winding of thesaid transformer, by means of the switch.

3. Telecontrol device according .to claim 1, in which the motor comprises two armature windings while the contacter relay comprises two contactors, each connected to one of the said armature windings.

4. Telecontrol device according to claim 1, in which at least one direct current amplifier is switched in between the frequency detector and the contacter relay.

5. Telecontrol device according to claim 1, further comprising an electromagnetic brake for the motor, this brake being arranged so that it exerts its braking action only when it is not energized and which is connected in parallel to the circuit of the motor.

6. Telecontrol device according to claim 1, in whichy the controlled moving component is the brush of a telecontrolled switch, further comprising a switching means placed in the circuit of the said switch and controlled by the contacter relay, so that the circuit of the said switch is open when the motor is energized and when the brush is moving.

7. Telecontrol device according to claim 1, in which the transmitter comprises a radio wave sender, frequency generators and contacting means to connect each frequency generator to the sender, in order to modulate the waves it emits, while the receiving means of the receiver consist in a radio receiver tuned to the waves emitted by the sender.

8. Telecontrol device according to claim 7, in which the radio receiver comprises a high frequency amplifier, a 'frequency changer connected to the said high frequency amplifier, a medium frequency ampliiier connected to the frequency changer, a detector connected to the medium frequency ampliiier, and a low frequency amplier which is connected to the detector and which comprises at least one push-pull output stage.

References Cited in the le of this patent UNITED STATES PATENTS 1,794,932 Usselman Mar. 3, 1951 2,085,424 Goodard June 29, 1937 2,085,442 Newell June 29, 1937 2,415,469 Webb Feb. 11, 1947 2,464,193 Wild Mar. 8, 1949

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