US3711758A - Device for remote-controlled reciprocal emission, transmission and reception of mechanical information - Google Patents

Device for remote-controlled reciprocal emission, transmission and reception of mechanical information Download PDF

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US3711758A
US3711758A US00154888A US3711758DA US3711758A US 3711758 A US3711758 A US 3711758A US 00154888 A US00154888 A US 00154888A US 3711758D A US3711758D A US 3711758DA US 3711758 A US3711758 A US 3711758A
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index
displacement
head
weight
position reader
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G Lelandais
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback
    • G05D3/14—Control of position or direction using feedback using an analogue comparing device

Definitions

  • each module comprises a position reader provided with a movable index which converts into successive electrical pulses an item of mechanical information relating to the motion of an actuating member which is associated with the index, a calibrated-compression spring mounted between a supporting carriage and the index so as to compress said spring, a mechanism for controlling the displacement of the supporting carriage parallel to the movement of the index and an indicator for indicating the direction of said movement, the mechanism for controlling one of the modules being actuated by the position reader and direction indicator which are associated with the other module and conversely while causing the displacement of the corresponding supporting carriage so that the initial elongation of the spring should tend to be restored.
  • This invention relates to an electromechanical device for the remote-controlled emission, transmission and restitution of mechanical information in which said device essentially comprises two identical modules for carrying out simultaneously and towards each other the emission and/or reception of information which is received by each module separately.
  • the invention applies more particularly in a device of this type to the transmission of information corresponding to a one-to-one displacement of a master element to a slave element which is designed to reproduce the movements of the master element the module which is associated with said master element effects the transmission of movement information to the module of the slave element which checks said information and transfers back towards the module of the master element the information resulting from the displacement proper of the master element.
  • the device under consideration carries out not only a transmission of information from the master element to the slave element but returns said information from the slave element to the master element, said information being modified if necessary by the conditions of motion of said master element in its own medium, while thus providing the master element with a controlled return of sensitivity in the displacement of the slave element.
  • each module comprises a position reader provided with a movable index which converts into successive electrical pulses an item of mechanical information relating to the motion of an actuating member which is associated with said index, a flexible calibrated-compression component mounted between a supporting carriage and said index so as to compress said flexible component, a mechanism for controlling the displacement of said supporting carriage parallel to the movement of the index and a direction indicator for indicating the direction of said movement, the mechanism for controlling one of the modules being actuated by the position reader and direction indicator which are associated with the other module and conversely while causing the displacement of the corresponding supporting carriage so that the initial elongation of the flexible element should tend to be restored.
  • the mechanism for controlling each module comprises a precision worm-screw which cooperates with a nut carried by the supporting carriage and is driven in rotation by a stepping motor, the thread of the worm-screw and the steps of the motor being selected so as to ensure that the displacement of the supporting carriage in respect of one step of the motor should be substantially equal to the displacement of the movable index of the position reader between two successive pulses.
  • the position reader comprises an inductive circuit constituted by a fixed winding which is wound around a stack of identical and parallel magnetic laminations separated by insulating strips and extending in planes at right angles to the direction of displacement of the LII ' magnetic elements each having an air-gap, the distance between two air-gaps within two adjacent elements being in a simple ratio with respect to the distance between two laminations in the inductive circuit.
  • each module comprises within an external protective casing antifriction bearings for centering and supporting the worm-screw in the axis of the casing whose end-walls support the stepping motor for actuating said worm-screw, and a moving weight-head which constitutes the index of the position reader, said weight-head being capable of sliding freely over a bushing of the supporting carriage and provided in the opposite faces thereof with bearing recesses for the ends of calibrated springs which are stressed solely in compression and the other ends of which are applied against two transverse shoulders formed on the bushing.
  • the reader-actuating member can consist in particular of at least one control tie-rod which passes through the springs of the weight-head and the shoulders of the bushing, said tierod being provided with an extension outside the outer casing. Nevertheless, in order to balance the force applied to the weight-head on each side of the worm-screw, said weight-head is preferably rigidly fixed to two parallel actuating tie-rods associated with four springs arranged in opposition in pairs on a common tie-rod and stressed in compression simultaneously in pairs.
  • the transverse shoulders of the bushing are preferably provided with projecting portions having the shape of triangular prisms in which the external edges located in a plane which passes through the axis of the worm-screw engage in longitudinal grooves provided in the internal surface of the casing.
  • FIG. 1 is a general view .of the device in which the two modules employed and their relative connections are illustrated diagrammatically
  • FIG. 2 is a view in perspective showing a particular embodiment of position reader of one of the modules
  • FIG. 3 is a more diagrammatic view of the same reader, of the direction indicator and of the associated electronic circuits
  • FIGS. 4 and 5 are views respectively in cross-section and in elevation showing a mechanical embodiment of one of the modules
  • FIGS. 6 and 7 are views respectively in elevation and in cross-section taken along line VIIVII of FIG. 6 and showing another embodiment.
  • the device essentially comprises two identical modules which are designated respectively by the references A and B, the module A being assumed to be associated with the master element and the module B being assumed to be associated with the slave element.
  • the components of the module A will be designated by a numeral to which is assigned the index a, it being understood that provision is also made in the module B for identical components which are followed in this case by the index b.
  • the module A comprises an actuating member which is represented diagrammatically in the drawings by a rod 1a and capable of undergoing a displacement along its axis in one-to-one correspondence.
  • Said rod la is joined to a position reader comprising a movable index 2a associated with two springs which are subject to accurately calibrated compression and respectively designated by the references 3a and 4a, said springs being mountedso as to bear at one end on the index 20 and at the other end on two transverse shoulders 5a and 6a of a support 7a which will be designated hereinafter as a carriage.
  • Said carriage is provided with a nut in cooperating relation with a worm-screw 8a having a precision thread and extending parallel both to the rod 1a and to the axis of the springs 3a and 4a.
  • Said wormscrew 8a is rigidly fixed to the output shaft of a stepping motor 9a of conventional type, namely a motor which is so arranged that a suitable electric pulse should control the rotation'of said motor through a given fixed angle without overshoot or oscillations, said angle of rotation being exactly reproducible as each control pulse is applied to the motor windings.
  • the position reader of the module A comprises in addition to themovable index 2a an electromagnetic unit whose precise function is to permit the possibility of measuring the displacements of said index and converting these latter into a series of electrical pulses which are capable of initiating the rotation of the stepping motor ofthe other module in the manner which was explained earlier after said pulses have been suitably shaped and amplified.
  • Said electromagnetic unit is composed of an electric supply 10 for a winding 11a of a fixed inductive circuit constituted by a stack of magnetic laminations 12a which are separated from each other by insulating strips 13a.
  • the laminations 12a (or 1212) of the inductive circuits of the two modules are designed in the form of small elongated and parallelepipedal bars of magnetic material which produce as a result of the induction set up by the flow of current through the winding 11a (or 11b) a magnetic field in which the lines of flux extend substantially in planes at right angles to the rod 1a (or lb) and consequently at right angles to the direction of displacement of the movable index 2a (or 2b).
  • the laminations 12a (or 12b) preferably have a, given thickness which is chosen so as to be equal to the thickness of the insulating strips 13a (or 13b) which serve to separate said laminations.
  • the movable index 2a is provided opposite to the laminations 12a of the fixed inductor with a magnetic element 14a of the same type as a magnetic reading head and designed in the form of a ring which is completely closed except for a discontinuity 15a which forms a very narrow air-gap.
  • a winding 16a which constitutes an induction coil is wound onto the element 14a and an electrical pulse induced by the fixed inductor is developed within said winding as the gap 15a passes through a region of the inductor each time the direction of the magnetic field is reversed.
  • the position reader which is constituted by the movable index 2a, the field winding 11a, the magnetic laminations 12a, the head 14a and the induction coil 16a produces a series of alternate pulses each time the gap 15a passes in front of a lamination or an insulating strip. Since these two components have the same design thickness, all the pulses produced will therefore be separated by the same interval which will be adopted hereinafter as a unit of reference for the displacement of the actuating rod 1a.
  • the thread of the worm-screw 8b is chosen in such a manner that the displacement of the carriage 7b which is produced as a result of rotation of said worm-screw should itself be substantially equal to the distance of displacement of the movable index between two successive pulses.
  • each angular displacement of the motor will result in forward motion of the carriage 7 which is engaged with the worm-screw over a distance of one ninety-sixty mm, namely a value which is substantially equal to the reference value of one one-hundredth mm.
  • said electrical pulses produced within the induction coil 16a of the module A as a result of a displacement of the index 2a under the action of the actuating rod in are transmitted to an electronic circuit for shaping said pulses which receives at the same time a complementary item of information indicating the direction of displacement of the index, depending on whether the rod la compresses either of the two springs 3a or 4a.
  • said direction indicator is formed by means of a magnetic rod 17a which is rigidly fixed to the index 2a and is capable of moving along the axis of a coil 18a while inducing within this latter a current whose phase is representative of the direction of displacement of said rod and consequently of the movable index.
  • the electrical pulses delivered by the position reader and the output signal of the direction indicator are processed in a rectifying and amplifying unit 19a which will be described in greater detail with reference to FIG. 3 and the output of which supplies the motor Qb of the module B.
  • the position reader and the direction indicator of the module B effect the control of the motor 9a, the two corresponding circuits being of strictly identical design.
  • FIG. l illustrates the principle of the essential elements and of their connections
  • This pulse is shaped and amplified in the circuit 19a and accordingly initiates a single-step rotational displacement of the motor 9b in the suitable direction which results in a movement of rotation of the worm-screw 8b and this latter accordingly displaces the carriage 7b inthe direction of motion of the actuating rod In, that is to say in this case towards the bottom of the drawing.
  • This control of the correct direction of rotation of the motor 9b is ensured by the signal emitted by the direction indicator of the module A which comprises the rod 17a and the coil 18a.
  • Rotation of the worm-screw 8b which is thus initiated is accompanied by the displacement of the carriage 7b over a distance which corresponds substantially to the interval between two successive pulses in the case of the movable index of the position reader if the choice of the number of steps of the motor and of the screwthread is correct.
  • the displacement of the carriage 7b is accompanied by the displacement of the index 2b by means of the spring 4b and consequently of the rod lb, the index 2b being transferred under these conditions in front of the laminations 12b of the fixed inductor of the module B over the distance thus defined.
  • This transfer motion in turn induces an electrical pulse within the induction coil 16b, said pulse is shaped and amplified in the circuit 19b and in turn initiates rotation of the motor 9a in the appropriate direction.
  • the single-step rotation of said motor and of the worm-screw 8a causes the displacement of the carriage 7a, thereby releasing the spring 3 a which is restored to its initial elongation.
  • the rod lib has therefore been accurately re-set in opposite relation to the rod in and the foregoing demonstration can subsequently be repeated irrespective of the amplitude and direction of displacements of said rods.
  • any action which prevents or is added to the action produced on the rod 1b as a result of displacement of the rod in causes a relative compression of one of the springs 3b or 4b and modifies the displacement of the movable index 2b with respect to the displacement of the carriage 7b the response of the position reader of the module B as converted into electrical pulses then gives rise in the module A to a similar compression of the springs 3a or 4a, thereby transferring to the rod in the sensitivity of movement of the rod lb.
  • FIG. 2 shows in perspective and on a larger scale one particular embodiment of the position reader as employed in the modules A and B described above.
  • the stacked parallelepipedal magnetic laminations l2 separated by insulating strips 13 having the same thickness are again shown in this figure, the complete which are placed in adjacent relation.
  • Separations 21 g which form air-gaps of the magnetic circuit are placed between said thin bars in front of the laminations l2 and are each fabricated from a thin sheet of non-magnetic material, especially gold foil.
  • the magnetic element 14 which forms the reading head is made up of six thin bars 20 and five separations or air-gaps 21 between said thin bars.
  • FIG. 3 accordingly shows the manner in which the magnetic laminations l2 and their insulating strips 13 are placed in oppositely facing relation to the thin bars 20 and their air-gaps 21.
  • the thickness of the thin bars 20 is advantageously chosen in a given simple ratio with respect to the thickness of the magnetic laminations 12 in such a manner that the displacement of the movable index 2 of the reader which is necessary for obtaining an electrical pulse within the coil 16 should be smaller than the thickness of each lamination 12 but also in the same ratio.
  • the laminations 12 in fact have a thickness of five one-hundredths mm which appears technologically to constitute a lower limit, the thin bars 20 will have a thickness of nine one-hundredths mm whilst the width of the air-gaps 21 is negligible. In fact, under these conditions, a displacement of the movable index over a distance of one one-hundredth mm which is taken as a reference will be sufficient to produce an electrical pulse within the induction coil 16. As can in fact be seen from FIG.
  • FIG. 3 also illustrates the detail of one of the electronic circuits 19 which is coupled with the induction coil 16 of the movable index 2 of the position reader of the associated module and .with the corresponding direction indicator 17, 18.
  • the pulses derived from the coil 16 are directed to an amplifier 22, then from the output of said amplifier to a rectifier 23 and towards a shaping circuit 24, with the result that said pulses finally have the shape of square waves having very steep leading edges.
  • the signal which is produced within the coil 18 as a result of displacement of the rod 17 is directed to a differential amplifier 25, then towards a shaping circuit 26 and finally towards a bistable circuit 27 which initiates the opening of a gate 28 or 29, thereby permitting the transmission of the electrical pulse having the shape of a square wave and delivered by the circuit 24 which in turn operates an assembly 30 so as to initiate and control the rotation of the motor 9 of the other module in the appropriate direction.
  • FIGS. 4 and 5 illustrate in sectional elevation one practical form of construction of one of the modules of FIG. 1.
  • the shaft 31 of the stepping motor 9 is provided with a coupling 60 which is adapted to engage with the extremity of the worm-screw 8.
  • Said worm-screw is rotatably mounted in bearings 33 and 34 carried by housings 35 and 36 which are'braced within an outer protective casing 37.
  • the supporting carriage 7 through which the worm-screw 8 passes comprises a longitudinal bushing 38 provided with a central internally threaded nut 39 and transverse annular endshoulders 40 and 41.
  • Said annular shoulders are provided in their outer surfaces with projecting members 42 which have the shape of triangular prisms as shown more especially in FIG.
  • a weight-head 44 which constitutes the index of the position reader and is intended to be employed in conjunction with the fixed inductive circuit as has been explained earlier is mounted on the bushing 38 and capable of sliding freely with respect to this latter.
  • Recesses 45 and 46 are formed in the opposite faces of said weight-head in order to accommodate the two calibrated-compression springs 3 and 4, the other ends of which are applied against the annular shoulders 40 and 41 of the carriage 7 within oppositely facing recesses 47 and 48.
  • the springs 3 and 4 are duplicated on each side of the bushing by two additional springs 3 and 4' as shown in FIG. 4.
  • the springs 3 and 3' on the one hand, 4 and 4' on the other hand are simultaneously stressed in compression as a result of the relative displacements of the weight-head with respect to the bushing 38.
  • two tie-rods 51 and 52 which are parallel to each other and to the worm-screw 8 are fixed on the weight-head 44 by means of locking-pins 49 and 50.
  • Said two tie-rods serve to controlthe displacement of the weight-head while being secured externally of the casing 37 to a cross-member 53 by means of nuts 54, said crossmember 53 being in turn rigidly fixed to the actuating rod 1 of the module considered.
  • the bearing housings 35 and 36 as well as the shoulders 40 and 41 are provided with bores 55 for the insertion of the tie-rods 51 and 52.
  • an electric cable 56 of the multiple conductor type for supplying the necessary current to the position reader and to the position indicator by means of terminals 57 which are provided on a connection plate or terminal strip 58.
  • the member which serves to actuate the weight-head consists of at least one rod which is subjected to an axial movement so as to produce the compression of one or a number of springs which are mounted in parallel on the supporting carriage.
  • said rod it would be wholly feasible to replace said rod by a fly-wheel or the like so as to apply a torque to the driving member by means of a rack, a set of gears or any other means for transmission of motion to the weight-head, thereby putting the calibrated springs in compression in accordance with the same basic principle.
  • said springs need no longer be disposed in axially aligned and opposite relation but along two opposite arcs having the same circumference.
  • An alternative arrangement of this type is illustrated diagrammatically in FIGS. 6 and 7. I
  • each module of the device comprises a frame 70 on which is fixed a stepping motor 71.
  • the output shaft 72 of said motor carries a pinion 73 and this latter is disposed in meshing engagement with a set of teeth 74 formed at the periphery of a component 75 which performs the function of supporting carriage.
  • Said component 7 5.has an extension 76 in the form of a tubular sleeve and a weight-head 77 is placed over said sleeve 76 and rotatably mounted thereon.
  • the weight-head 77 is associated with two springs respectively designated by the numerals 78 and 79 and having perfectly calibrated compression, said springs being positioned with respect to the weight-head by being engaged at one end in recesses 80 and 81 of this latter and by being applied at the opposite ends within two other recesses 82 and 83 which form part of the component 75.
  • the springs 78 and 79 are advantageously maintained in position with respect to the component 75 on the one hand and with respect to the weight-head 77 on the other hand by means of an arcuate guide rod 84 which is rigidly fixed to the component 75 and passes axially through the springs 78 and 79 and through a bore formed in the weight-head 77.
  • the springs 78 and 79 are preferably duplicated by two further springs 78' and 79 which are symmetrical with respect to the axis of the component 75, said springs 78 and 79' being so arranged as to be subjected to compressive forces which are equal respectively to those applied to the springs 78 and 79 as a result of the relative displacements of the weight-head 77 with respect to the component 75.
  • the weight-head 77 is rigidly fixed to a shaft 85 which passes through a bore 86 formed in the component 75 and is rotatably mounted in bearings 87 and 87' which form part of the frame 70.
  • a spur pinion 89 mounted in bearings 93 and 94 which also form part of the frame 70.
  • Said shaft 91 extends towards the righthand side of FIG. 6 in order to enable an operator who is actuating the module shown in the drawing to rotate said shaft and thus to carry out by means of the toothed ring 90 and the pinion 89 the relative rotation of the weight-head 77 and the compression of the springs 78 and 78' or 79 and 79' depending on the direction of said rotation.
  • a device 95 of the selsyn motor type or the like is mounted on the extension of the shaft 85 on the other side of the bearing 87 said device constitutes the position reader and the direction indicator for the displacement of the weight-head 77.
  • the operation of the device in the alternative embodiment according to FIGS. 6 and 7 is exactly similar to the operation which was contemplated in the first embodiment.
  • the rotation of the shaft 91 which constitutes the actuating member in this case causes displacement of the weight-head 77 and compression of one of the springs 78 or 79 while the position reader 95 delivers a series of electrical pulses at the same time.
  • Said pulses are suitably shaped and in turn initiate rotation of the shaft of the stepping motor 71 of the associated module, thereby producing by means of the pinion 73 and the set of teeth 74 the displacement of the component which forms a supporting carriage and the angular re-setting of this latter with respect to the weight-head, the springs 78 or 79 being restored to their initial elongations which may be modified by the actual conditions of displacement to which the shaft 91 of the other module is subjected. It is nevertheless wholly evident that the principle of operation of the device is not directly influenced by the particular arrangement of its components. In particular, the pinion 89 and the toothed ring 90 could readily be dispensed with and in this case the shaft 91 which constitutes the operating member produces action directly on the shaft and the position reader 95.
  • the assembly for transmission of mechanical information which is thus provided is particularly simple, reliable and well suited to problems of recopy of movements of a master element by a slave element.
  • Said device can advantageously be employed in the field of application of either direct or radio-controlled remote manipulation facilities with return of sensitivity to the user who is operating the master element to which the slave element restitutes its own movement information arising either from the operation or from the medium of said slave element.
  • other applications could also be contemplated, especially in the field of machines or toys which are remote-controlled either by means of direct or indirect mechanical linkages or by means of emission 'and reception of radiowaves.
  • consideration could be given to applications in the field of handling or earth-moving appliances, machine-tools or finally any simulation installation.
  • the springs of the modules could be replaced by any other flexible components having calibrated compression, especially by pneumatic capsules or even by blocks of material having suitably determined elasticity.
  • the position reader and direction indicator could be provided in accordance with modes of construction other than those contemplated in the foregoing in particular, it would be possible to employ a system of photoelectric cells which are carried by the movable index and intended to count lines which are cut on an oppositely facing stationary rule, a digital coder, a rotary transmitter or any other system for converting a displacement into electrical pulses.
  • a potentiometric control system comprising a potentiometer which has a wholly linear response and the sliding contact of which is rigidly fixed to the movable index.
  • the electrical voltage supplied between the sliding contact and one terminal of the potentiometer is calibrated or in other words is such that a repetitive variation in voltage by a given unit should correspond to each movement of the index or reference displacement, for example. It should be noted that the direction of this variation indicates ipso facto the direction of displacement of the movable index.
  • Said variable voltage is passed into the associated electronic assembly which delivers to the-control stepping motor the pulses which are necessary to reset the index of the reception module with respect to the function of the emission module or conversely in the manner which has already been indicated.
  • a device for the remote-controlled reciprocal emission, transmission and reception of mechanical information between two identical modules wherein each module comprises a position reader provided with a movable index which converts into successive electrical pulses an item of mechanical informationrelating to the motion of an actuating member which is associated with said index, a flexible calibrated-compression component mounted between a supporting carriage and said index so as to compress said flexible component, a mechanism for controlling the displacement of said supporting carriage parallel to the movement of the index and a direction indicator for indicating the direction of said movement and mechanism for controlling one of said modules actuated by said position reader and by said direction indicator of the other of said modules and for causing the displacement of the corresponding one of said supporting carriages whereby the initial elongation of said flexible component is reduced.
  • each module comprises a precision worm-screw which cooperates with a nut carried by the supporting carriage and driven in rotation by a stepping motor, the thread of the worm-screw and the steps of the motor being selected so as to ensure that the displacement of the supporting carriage in respect of one step of the motor should be substantially equal to thedisplacement of the movable index of the position reader between two successive pulses.
  • the position reader comprises an inductive circuit constituted by a fixed winding which is wound around a stack of identical and parallel magnetic laminations separated by insulating strips and extending in planes at right angles to the direction of displacement of the movable index, and an induction head carried by said movable index and comprising at least one magnetic element fitted with an induction coil, said magnetic element being provided with a discontinuity forming an air-gap which is adapted to move in the immediate vicinity of the stack of magnetic laminations.
  • the laminations of the inductive circuit are equal in thickness to the insulating strips provided between the successive laminations, the induction head being made up of a plurality of adjacent magnetic elements each having an air-gap, the distance between two air-gaps within two adjacent elements being in a simple ratio with respect to the distance between twolaminations in the inductive circuit.
  • a device wherein the position reader is constituted by a potentiometric control system in which the sliding contact is rigidly fixed to the movable index.
  • a device wherein the position reader is constituted by a graduated rule in which the lines are counted by a photoelectric cell carried by the movable index.
  • each module comprises within an external protective casing antifriction bearings for centering and supporting the worm-screw in the axis of the casing whose end-walls support the stepping motor for actuating said wormscrew and a moving weight-head which constitutes the index of the position reader, said weight-head being capable of sliding freely over a bushing of the supporting carriage and provided in the opposite faces thereof with bearing recesses for the ends of calibrated springs which are stressed solely in compression and the other ends of which are applied against two transverse annular shoulders formed on the bushing.
  • the readeractuating member is constituted by at least one control tie-rod which passes through the springs of theweight head and the annular shoulders of the bushing, said tierod being provided with an extension outside the outer casing.
  • weighthead is rigidly fixed to two parallel actuating tie-rods associated with four springs which are arranged in opposition in pairs on a common tie-rod and stressed in compression simultaneously in pairs.
  • transverse annular shoulders of the bushing are provided with projecting portions having the shape of triangular prisms in which the external edges located in a plane which passes through the axis of the worm-screware adapted to engage in longitudinal grooves formed in the internal surface of the casing.
  • a device wherein the component which forms a supporting carriage comprises an external set of teeth in cooperating relation with a pinion and said pinion is rigidly fixed to the shaft of a stepping motor which constitutes the control mechanism.
  • a device wherein the position reader is constituted by an electromagnetic transmitter of the selsyn motor type.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Position Or Direction (AREA)
  • Control Of Stepping Motors (AREA)
US00154888A 1970-06-24 1971-06-21 Device for remote-controlled reciprocal emission, transmission and reception of mechanical information Expired - Lifetime US3711758A (en)

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FR7023439A FR2094545A5 (enrdf_load_stackoverflow) 1970-06-24 1970-06-24

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DE (1) DE2131462C3 (enrdf_load_stackoverflow)
FR (1) FR2094545A5 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939389A (en) * 1973-01-17 1976-02-17 Zumbach Electronic - Automatic Positioning control apparatus
US20030082987A1 (en) * 2001-11-01 2003-05-01 Mattel, Inc. Master and slave toy vehicle pair

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2447212A (en) * 1944-11-13 1948-08-17 Honeywell Regulator Co Variable inductance pickup device
US3454855A (en) * 1966-08-19 1969-07-08 Barber Colman Co Stepping servo in which a first transmitter is advanced and a second feedback transmitter follows
US3457482A (en) * 1967-10-30 1969-07-22 Bruce A Sawyer Magnetic positioning device
US3505576A (en) * 1966-07-12 1970-04-07 Litton Business Systems Inc Digital servomechanism including an inductive position encoder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2447212A (en) * 1944-11-13 1948-08-17 Honeywell Regulator Co Variable inductance pickup device
US3505576A (en) * 1966-07-12 1970-04-07 Litton Business Systems Inc Digital servomechanism including an inductive position encoder
US3454855A (en) * 1966-08-19 1969-07-08 Barber Colman Co Stepping servo in which a first transmitter is advanced and a second feedback transmitter follows
US3457482A (en) * 1967-10-30 1969-07-22 Bruce A Sawyer Magnetic positioning device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939389A (en) * 1973-01-17 1976-02-17 Zumbach Electronic - Automatic Positioning control apparatus
US20030082987A1 (en) * 2001-11-01 2003-05-01 Mattel, Inc. Master and slave toy vehicle pair

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DE2131462A1 (de) 1972-03-23
FR2094545A5 (enrdf_load_stackoverflow) 1972-02-04
DE2131462C3 (de) 1973-12-20
DE2131462B2 (de) 1973-06-07

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