US3831074A - Rotator system including a remote drive motor and a local indicator-control motor - Google Patents

Rotator system including a remote drive motor and a local indicator-control motor Download PDF

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Publication number
US3831074A
US3831074A US00274637A US27463772A US3831074A US 3831074 A US3831074 A US 3831074A US 00274637 A US00274637 A US 00274637A US 27463772 A US27463772 A US 27463772A US 3831074 A US3831074 A US 3831074A
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United States
Prior art keywords
motor
coupled
terminal
switch
phase
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US00274637A
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English (en)
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P Smalser
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RCA Licensing Corp
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RCA Corp
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Priority to US00274637A priority Critical patent/US3831074A/en
Priority to CA175,101A priority patent/CA986983A/en
Priority to GB3397673A priority patent/GB1438555A/en
Priority to IT26933/73A priority patent/IT991339B/it
Priority to FR7327078A priority patent/FR2194320A5/fr
Priority to JP8351673A priority patent/JPS555721B2/ja
Priority to DE19732337552 priority patent/DE2337552A1/de
Application granted granted Critical
Publication of US3831074A publication Critical patent/US3831074A/en
Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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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
    • G05D3/125—Control of position or direction using feedback using discrete position sensor
    • G05D3/127—Control of position or direction using feedback using discrete position sensor with electrical contact

Definitions

  • ABSTRACT A rotator system is described wherein a remote drive motor rotates a shaft and an associated first cam.
  • a regulated, local reversible motor when activated rotates a local indicator-control device and an associated second cam.
  • the first and second cams function with separate switch means in a manner to each apply to the local motor one of two voltage potentials.
  • the local reversible motor is responsive to a difference of electrical potential there across which is associated with the lack of synchronization of the two cams for causing rotation of the indicator-control device to correspond to the shaft rotation.
  • a synchro system i.e., a system of a generator and a motor where the rotor of a motor aligns itself with the fields of a stator winding.
  • a synchro system is costly and therefore is generally considered as being undesirable as a rotator for home television antenna systems, FM receiving antennas, etc.
  • Another method of indicating antenna direction is by the pulsed energization of a solenoid which causes either the stepping of a ratchet wheel (see US. Pat. No. 3,501,969) or allows the movement of a spring driven escapement wheel one notch or tooth per movement of the solenoid.
  • ratcheting and escapement systems are noisy and sometimes require a pair of solenoids unless a specific structure is used to provide bidirectional movement. Further it is desirable to preselect the desired antenna direction and to use the same system for both indicating the pointing direction of the antenna and for automatically stopping the antenna at the preselected direction.
  • a rotator system includes anAC induction motor for driving the object to be rotated, a DC motor for driving an indicator and control member, and means for providing to one winding of the AC motor an AC supply voltage of one phase and to another winding of the AC motor an AC supply voltage of a second different phase to cause energization of the AC motor.
  • a first terminal of the DC motor is coupled to either the first or the second winding of the AC motor depending upon the rotated position of the AC motor.
  • the second terminal of the DC motor is coupled through an AC rectifier to either the first or the second windind depending upon the rotated position of the DC motor.
  • the AC rectifier permits unidirectional rotation of the DC motor only when one terminal of the DC motor is coupled to the first winding and the opposite terminal of the DC motor is coupled to said second winding.
  • FIG. 4 is a perspective view of the direction-memory cam according to an embodiment of the present invention.
  • a rotator system 10 includes a remote rotator drive unit 1 1, a local control unit 13 and four wires l5, 16, 17 and 19 interconnected between the control unit 13 and the remote drive unit 11.
  • the control unit 13 may be located on top of a television set and the drive unit 11 may be loacated at a remote position such as at an antenna mast supported from and extending above the roof top of a dwelling.
  • the drive unit includes a split-phase AC motor 31, a gear train 33, and a phase sensing system that includes a cam 45 and a multiposition contact switch 47.
  • a rotatable shaft 35 to which an antenna mast (not shown) may be mounted is coupled to the gear train 33 which, in turn, is coupled to the AC motor 31.
  • the gear train 33 is activated and the shaft 35, the mast (not shown), and the cam 45 is rotated.
  • the drive unit cam 45 in this example is geared to make one revolution for-every 6 of rotation by the drive unit shaft 35.
  • the drive unit AC motor 31 includes a pair of windings 31a and 31b.
  • the power supply' is coupled to the windings 31a and 31b so as to provide a phase difference of the alternating potentials between the two windings. This can be accomplished by a phase shifting capacitor 37 coupled between wires 17 and 19 and by the arrangement of the windings.
  • the windings 31a and 31b are coupled to a common point 32 at which wire 16 is connected.
  • the multiposition contact switch 47 has one terminal 48 coupled via wire 109 to wire 19 at end 34 of winding 31a and has a second terminal 46 coupled via wire 107 to wire 17 at end 36 of winding 31b.
  • a center terminal 49 of multiposition switch 47 is coupled to wire 15.
  • Wire is connected at one terminal 51a of a DC motor 51. This motor 51 and its operation is discussed in connection with the control unit 13.
  • Terminal 49 is connected to contact 48a, and terminal 46 is connected to contact 46a of switch 47.
  • Contact 49a is a movable contact member and is connected to tenninal member 49 of switch 47. Contact 49a is physically biased to be normally connected to contact 48a.
  • Cam 45 has a lobe 45a which, for example, in the present embodiment extends half way around the perimeter of the cam 45.
  • the lobe 45a of the cam drives the movable contact 49a into connection with contact 46a.
  • the contact 49a snaps back (due to the bias) into connection with contact 48a.
  • contact 490 makes connection with contact 46a, the AC voltage of a first phase at end 36 of winding 31b is coupled through switch 47 to wire 15.
  • contact 49a is out of contact with contact 46a and connects with contact 48a the AC voltage of a second phase at end 34 of winding 31a is coupled through switch 47 to wire 15.
  • a pair of terminals 14a and 14b couple 117 volts AC to the primary winding 23 of a'transformer 21.
  • the transformer 21 steps down the voltage and provides 20 volts AC at the secondary winding 25.
  • a main on-off switch 27 is coupled in series with the primary winding 23 of transformer 21. When the contacts 27a and 27b of switch 27 are closed, the 117 volts AC is applied across the primary coil 23 and coupled to the secondary winding 25 of transformer 21. If the contacts 27a and 27b are open, the transformer 21 and consequently the control unit 13 and the entire rotator system is de-energized.
  • contacts 27a and 27b are provided by misalignment and alignment, respectively, of a preselector disk 54 (shown in more detail in FIGS. 2 and 3) and an indicator disk 53.
  • disks 53 and 54 shown in FIG. 1 in simplified form are tilted slightly so disk 54 can be seen.
  • Switch 27 which may be coupled to disk 54 turns with disk 54.
  • the indicatorcontrol disk 53 is spaced parallel to and above disk 54 on a shaft'83 (see FIG. 3). Disk 53 is mounted so as to freely rotate on the shaft.
  • Disk has an extension 84 thereon adapted so that when the disks 53 and 54 are aligned, extension 84 pushes contact 27a away from contact 27b, de-energizing the system
  • extension 84 is misaligned with switch 27, as when knob 81 rotates the disk 54 clockwise or counterclockwise, the contacts 27a and 27b are closed and the system is energized.
  • the volts AC at the secondary coil is applied through a motor direction switch 43 to the drive unit motOr 31 and to control unit motor 51.
  • the end 25 1 of secondary 25 is coupled via wire 16 to a common point 32 of windings 31a and 31b of the drive unit motor 31.
  • the end 25b of winding 25 is coupled to the center terminal 44 of switch 43.
  • Terminal 41 of switch 43 is coupled by wire 19 to end point 34 of drive unit motor winding 31a.
  • Terminal 42 is connected by wire 17 to end point 36 of drive unit motor winding 31b.
  • the phase shifting capacitor 37 is coupled between wires 17 and 19 to provide a time-phased displacement between the currents in the two windings 31a and 31b and thereby facilitate activation of'the drive unit motor 31.
  • Switch 43 is a flexible leaf contact switch with a flexible contact 44a connected to the terminal 44 and adapted to, when flexed, make contact with either contact member 420 connected to terminal 42 or with contact member 41a connected to terminal 41.
  • the switch 43 is, for example, fixed to disk 54.
  • a direction-memory c 87 Also fixed to the disk 54 is a direction-memory c 87.
  • the cam 87 is rotatably mounted to the disk 54 and has an extension that fits into a groove 89 in disk 53 when disks 53 and 54 are aligned. As shown in FIGS. 2 and 3, the cam 87 has gaps 102 and 104 therein. Flexible leaf contact 44a extends into gap 104.
  • Wheb knob 81 rotates clockwise, the direction-memory cam 87 rotates counterclockwise and causes direction-memory cam 87 to push contact 44a into connection with contact 41a.
  • the direction-memory cam rotates clockwise and causes contact 44a to connect with contact 42a.
  • cam 87 and the disks 53 and 54 are provided in connection with FIGS. 2 thru 4.
  • a local indicatlon and control of the rotation of shaft and hence the pointing direction of the antenna is achieved by controlling the rotation of the indicator-control disk 53.
  • the indicatorcontrol disk 53 is coupled by a gear train 52 to a DC control unit motor 51.
  • control unit cam 55 is also coupled to gear train 52.
  • Control unit cam 55 has a lobe 55a which extends for the present example about half way around the perimeter of the control unit cam 55.
  • the control unit cam 55 is geared to make one revolution every 6 of turn by the indicator-control disk 53.
  • the speed of DC control unit motor 51 is such that the control unit cam 55 turns faster than drive unit cam 45.
  • Control unit cam 55 is driven sufficiently faster than drive unit cam 45 so that cam 55 turns one half of a complete revolution and indicator-control disk 53 progresses 3 before switch 47 can change connection of contacts and before shaft 35 and the antenna has rotated 3
  • the DC control unit motor 51 and hence the indicator-control disk 53 is caused to rotate in response to a difference in phase of alternating potentials between the tenninal ends 51a and 51b of motor 51.
  • the consequential potential difference for activating the control unit motor 51 is dependent upon the lack of synchronization of cams 45 and 55.
  • the terminal 51a is coupled via wire 15 to terminal 49 of switch 47. Since the contact 49a which is connected to terminal 49 makes connection with either contact 460 or contact 48a, the alternating voltage of the first phase at end 36 of winding 31b or the alternating voltage of a second phase at end 34 of winding 31a is coupled to terminal 51a of control unit motor 51. Since the phase of the voltage at terminal 49 of switch 47 and on wire 15 is dependent upon the position of cam 45, the rotated position of this cam 45 and consequently of the AC motor 31 is sensed by the phase of the alternating voltage at terminal 51 a of DC motor 51.
  • control unit motor 51 is coupled through either rectifier diode or 67, switch 61 to a terminal 72 of switch 71.
  • Switch 61 determines which of the diodes 65 or 67 completes the circuit through the control unit motor 51 and consequently the direction of rotation of the control unit motor 51.
  • Switch 71 has one terminal 73 coupled to wire 19 and to terminal 41 of switch 43.
  • Terminal 74 of switch 71 is connected to wire 17 and to terminal 42 of switch 43.
  • switch 71 When contact 44a makes connection with contact 42a, the alternating potential of the second phase at end 25b of secondary winding 25 and at wire 17 is coupled to terminal 74 of switch 71.
  • the center terminal 72 of switch 71 is coupled via wire 69 to terminal 66 of switch 61, and dependent upon the position of switch 61 either diode 65 or 67 completes the circuit to terminal 51b of DC motor 51.
  • the center terminal 72 of switch 71 is connected to a movable contact 72a.
  • the control unit cam 55 drives the movable contact 72a such that only the lobe 55a forces the movable contact 72a into connection with contact 74a.
  • the control unit cam 55 is rotated so that lobe 55a is no longer in contact with movable contact 72a, the contact 72, which is biased so that it is normally closed with contact 73a, snaps into connection with contact 73a.
  • cam 55 is rotated, the alternating voltage of the phase at wire 17 and of the phase at wire 19 is rectified and alternately coupled to terminal 51b of the DC control unit motor 51.
  • switch terminal 46 of switch 47 and switch terminal 74 of switch 71 are both connectable via wires 107 and 101 respectively to wire 17 and to terminal 42, the alternating potentials and the phase of these potentials at contacts 46a and 74a are approximately the same.
  • the cams 45 and 55 are in the synchronized position of FIG. 1, so that movable contact 49a makes connection with contact 46a and movable contact 72a makes connection with contact 74a, the terminals 51a and 51b of DC control unit motor 51 are coupled to the same alternating potential value and phase. Motor 51 remains inactivated.
  • the direction in which the DC control unit motor 51 turns is determined by the position of switch 61.
  • the switch 61 is fixed, for example, to disk 54 with the center contact member 66a positioned in gap 102 of the direction-memory cam 87.
  • a terminal 68 of switch 61 is coupled to the anode 67a of diode 67.
  • the cathode 67b of diode 67 is coupled to end 51b of DC control unit motor 51.
  • Terminal 64 of switch 61 is coupled to the cathode 65b of diode 65.
  • the anode 65a of'diode 65 is coupled to the end 51b of DC motor 51.
  • Diodes 65 and 67 each provide half wave rectifiecation of the 20 volt AC from the secondary coil 25 via switches 61, 71, and 43.
  • the 20 volt AC is coupled to either diode 65 or 67 depending upon the position of switch 61.
  • the center leaf contact member 66a can make contact with either contacts 68a or 640.
  • Contact 68a is connected to terminal 68
  • contact member 64a is connected to terminal 64.
  • the flexible contact member 66a is connected to terminal 66 of switch'61 which in turn is coupled by wire 69 to terminal 72 of switch 71.
  • switch member 61 is in the closed position whereby center flexible leaf contact member 66a makes contact with member 64a, the 20 volt AC is coupled through switch 71 and wire 69 to diode 65. Diode 65 then completes the circuit to terminal 51b. of DC motor 51.
  • the DC motor 51 When the out-of-phase potentials are applied across the series combination of the DC motor 51 and the diode 65, the DC motor is allowed to rotate in only one direction due to the rectification by the diode 65.
  • flexible contact member 66a makes contact with member 68a, as when the direction-memory cam 87 rotates clockwise, the 20 volts AC is coupled through switch 71 and wire 69 to diode 67.
  • Diode 67 then completes the circuit to terminal 51b of the DC motor 51. Due to the rectification by the diode 67, the DC motor 51 is permitted to rotate only in a direction opposite the above one direction.
  • diode 65 is placed in the DC motor circuit allowing the control unit motor 51 to rotate only in a clockwise direction and toward realignment of disks 53 and 54.
  • the center contact 49a is connected to contact 46a.
  • the contact 46a is connected via wire 107 to wire 17.
  • the alternating potential of the first phase at wire 17, which is out of phase with that at wire 19, is then applied to terminal end 51a.
  • the center contact 72a is connected to contact 74a and contact 74a is connected via wire 101 to wire 17.
  • the alternating potential of the first phase at wire 17 is then applied via switch 71 and switch 61'to diode 65.
  • diode 65 Since the opposite end of diode 65 is connected to terminal end 51b of DC motor 51 and consequently both ends of the series combination of diode 65 and control unit motor 51 are coupled to the same alternating potential of the same phase at wire 17, the circuit is balanced and the DC control unit motor 51 is deactivated.
  • contact 49a makes connection with contact 48a.
  • the sensed alternating potential of the second phase at point 34 of winding 31a is coupled through switch 47 and wire to terminal 51a of DC motor 51. Since switch 71 is still completing the connection of the alternating potential of the first phase at wire 17 to terminal 51b, there exists a phase different and consequently a voltage difference across the series combination of the DC motor 51 and diode 65 and the DC motor 51 rotates and drives cam 55 and indicator-control disk 53.
  • the DC motor 51 direction is controlled by diode 65.
  • the DC motor 51 continues to drive the cam 55 and the indicator-control disk 53 until cam 55 is rotated so that contact 720 is off the lobe 55a and snaps into connection with contact 73a.
  • Contact terminal 73 is connected via wire 103 to wire 19 and via switch 43 to the alternating potential of the second phase at end b of secondary 25. Since this same potential is coupled via switch 47 to terminal end 51a of the DC motor 51, the motor is deactivated.
  • control unit motor 51 is deactivated.
  • FIG. 2 and 3 there is shown a top view and an elevation view respectively of the control unit 13 which includes an indicator-control disk 53 positioned in a given alignment above a selector disk 54.
  • a control knob 81 is coupled to a shaft 83 which extends through indicator-control disk 53 and-is fixed to selector disk 54.
  • Indicator-control disk 53 is mounted to shaft 83 so that it freely rotates about the shaft.
  • Selector disk 54 is fixedly mounted and rotates with the shaft.
  • the shaft 83 is fixed but rotatably mounted to a baseboard 85. Extending between selector disk 54 and indicator-control disk 53 is the leaf spring type, normally closed contact switch 27.
  • a small member 84 extends from a point near the periphery of control disk-53 and only makes contact with normally closed on-off switch 27 when disks 53 and 54 are in aligned position therewith to break the contact between the members 27a and 27b, deactivating the system 10.
  • the motor direction switches 61 and 43 are mounted to selector disk 54.
  • a rotatable direction-memory cam 87 is rotatably mounted to the selector disk 54 by a pin 88a having a head below disk 54 and extending through disk 54 and into base portion 95.
  • the direction-memory cam 87 includes a base portion 95 adapted to receive pin 88a and three parallel extending members 96, 97 and 98 spaced from each other and from the base portion 95 by a spacer portion 99.
  • a tooth-shaped member 88 extends vertically and laterally from the base member 95.
  • a gap 104 existsbetween members 98 and 97, and a gap 102 exists between members 97 and 96.
  • the rotatable directionmemory cam 87 extends in the region between indicator-control disk 53 and selector disk 54 with the toothshaped extending member 88 positioned just below control disk 53.
  • a ring member 53a positioned below indicator-control disk 53 may be formed as an extension of disk 53 to extend about the periphery of this disk 53.
  • the ring member 53a has a groove 89 therein extending from the inboard surface.
  • the tooth-shaped member 88 of direction-memory cam 87 is adapted to fit into groove 89 when the control disk 53 and selector disk 54 are aligned and the main on-off switch 27 is deenergized.
  • the direction-memory cam 87 and the switches are arranged so that flexible leaf member 44a extends through gap 104 and flexible leaf member 66a extends through gap 102. See FIGS. 2 and 4.
  • the toothshaped member 88 is lodged into slot 89 and the flexible contact members 660 and 44a make no contact with either of their adjacent contact members.
  • the control knob 81 and disk 54 is rotated, for example, in a clockwise direction, the tooth-shaped member 88 is driven laterally and thereby rotates out of slot 89 and causes the direction-memory cam 87 to rotate, in the example, in a counterclockwise direction.
  • direction-memory cam 87 When direction-memory cam 87 rotates in a counterclockwise direction, the member 98 of direction-memory cam 87 pushes contact member 44a and member 97 of direction-memory cam 87 pushes contact member 66a so that contact member 44a makes contact with member 41a and contact member 66a makes contact with member 64a.
  • the drive unit 11 is then made to rotate in the selected direction with the DC control motor 51 made when energized to drive the control disk 53 in the proper direction to realign disk 53 with disk 54.
  • a rotator comprising: an AC motor for driving the object to be rotated, said AC motor having a pair of windings,
  • means including an AC rectifier coupled between said first and second leads and the second terminal of said DC motor and responsive to the rotated position of said DC motor for causing activation of the DC motor when said first and second leads are coupled to opposite terminals of said DC motor and for causing de-energization of said DC motor when said first and second terminals of said DC motor are coupled to the same one of said leads.
  • said means coupled to said first terminal for providing an AC potential of either said first or second phase includes a switch having a first terminal connected to the first lead and a second terminal connected to the second lead and a third movable member of the switch coupled by a gear train to said AC motor.
  • said means coupled between said first and second leads and the second terminal of said DC motor includes a second switch having the center movable contact member coupled by a gear train to said DC motor.
  • said potential coupling means including means for receiving the phase of the AC potential at said first and second leads to cause energization of said AC motor in an opposite sense.
  • said means coupled between said first and second leads and the second terminal of said DC motor includes a pair of rectifiers with a first of the rectifiers allowing rotation of said DC motor in a first direction and the second rectifier permitting rotation of the DC motor in a second opposite direction.
  • a system for rotating a remote shaft and for providing a local indication of the rotated position thereof comprising:
  • a first reversible driving means including a reversible AC induction motor and a first gear train, said reversible AC motor having a pair of windings and responsive to energization potentials of one phase at one winding and of a second phase at the second winding for driving said remote shaft and gear train,
  • a second driving means including a two terminal reversible DC motor and a second gear train coupled to each other and said indicator and responsive to an energizing potential applied thereto for driving said indicator,
  • a first switch means having a first contact coupled to a first winding of said AC motor and a second contact coupled to the second winding of said AC motor and a movable contact coupled to a first terminal of said DC motor, said movable contact being driven by said first gear train for in response to a given movement of said first gear train causing said movable contact to switch between said first and second contacts and consequently provide at the first terminal of said DC motor an AC potential of said first phase at one rotated position of the AC motor and an AC potential of said second phase at a second rotated position of the AC motor, a second switch means, an AC rectifying means coupled between said second switch means and the secondterminal of said DC motor for providing unidirectional potential across said DC motor, said second switch means having first contact member coupled to said first lead and a second contact member coupled to said second lead and.
  • a movable contact member coupled to said rectifying means, said movable contact member being driven by said second gear train for in response to a given movement thereof causing said movable contact member to switch between said first and second contact members thereof and apply to said rectifying means and said DC motor said first and second phase potentials in a manner to cause energization of said DC motor when said gear trains are not synchronized so that said first and second leads are coupled to opposite. terminals of said DC motor and de-energization of said DC motor when said gear trains are synchronized so that said first and second terminals of said DC motor are coupled to the same one of said leads.
  • said first gear train includes a first cam which drives the movable contact of said first switch.
  • said second gear train includes a cam which drives the movable contact of said second switch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Selective Calling Equipment (AREA)
  • Control Of Ac Motors In General (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US00274637A 1972-07-24 1972-07-24 Rotator system including a remote drive motor and a local indicator-control motor Expired - Lifetime US3831074A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00274637A US3831074A (en) 1972-07-24 1972-07-24 Rotator system including a remote drive motor and a local indicator-control motor
CA175,101A CA986983A (en) 1972-07-24 1973-06-28 Rotator system including a remote drive motor and a local indicator-control motor
GB3397673A GB1438555A (en) 1972-07-24 1973-07-17 Rotator system including a remote drive motor and a local indicator-control motor
IT26933/73A IT991339B (it) 1972-07-24 1973-07-23 Sistema rotatore includente un motore di comando a distanza e un motore locale di indicazione e di governo
FR7327078A FR2194320A5 (enExample) 1972-07-24 1973-07-24
JP8351673A JPS555721B2 (enExample) 1972-07-24 1973-07-24
DE19732337552 DE2337552A1 (de) 1972-07-24 1973-07-24 Einrichtung zum ferndrehen und oertlichen anzeigen der drehlage einer welle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00274637A US3831074A (en) 1972-07-24 1972-07-24 Rotator system including a remote drive motor and a local indicator-control motor

Publications (1)

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US3831074A true US3831074A (en) 1974-08-20

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US00274637A Expired - Lifetime US3831074A (en) 1972-07-24 1972-07-24 Rotator system including a remote drive motor and a local indicator-control motor

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US (1) US3831074A (enExample)
JP (1) JPS555721B2 (enExample)
CA (1) CA986983A (enExample)
DE (1) DE2337552A1 (enExample)
FR (1) FR2194320A5 (enExample)
GB (1) GB1438555A (enExample)
IT (1) IT991339B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058756A (en) * 1976-03-05 1977-11-15 Zenith Radio Corporation Bidirectional channel skipping tuner drive system with single pole programming switch
US4673904A (en) * 1984-11-14 1987-06-16 Itt Corporation Micro-coaxial substrate
US20060156841A1 (en) * 2002-11-29 2006-07-20 Muldowney-Colston Tony E Rotating electrical machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2258292A (en) * 1991-07-04 1993-02-03 Michal Jurewicz Automated and manual control knob device.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496485A (en) * 1946-08-22 1950-02-07 Bendix Aviat Corp Remote control and indicating system
US3102218A (en) * 1960-06-30 1963-08-27 Crown Controls Corp Plural motor remote control system
US3200314A (en) * 1963-05-03 1965-08-10 Iroler Maurice Benton Tuner antenna control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496485A (en) * 1946-08-22 1950-02-07 Bendix Aviat Corp Remote control and indicating system
US3102218A (en) * 1960-06-30 1963-08-27 Crown Controls Corp Plural motor remote control system
US3200314A (en) * 1963-05-03 1965-08-10 Iroler Maurice Benton Tuner antenna control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058756A (en) * 1976-03-05 1977-11-15 Zenith Radio Corporation Bidirectional channel skipping tuner drive system with single pole programming switch
US4673904A (en) * 1984-11-14 1987-06-16 Itt Corporation Micro-coaxial substrate
US20060156841A1 (en) * 2002-11-29 2006-07-20 Muldowney-Colston Tony E Rotating electrical machine
US7323842B2 (en) * 2002-11-29 2008-01-29 Dolphin Electric Holdings, Inc. Rotating electrical machine

Also Published As

Publication number Publication date
CA986983A (en) 1976-04-06
JPS4953749A (enExample) 1974-05-24
DE2337552A1 (de) 1974-02-07
JPS555721B2 (enExample) 1980-02-08
FR2194320A5 (enExample) 1974-02-22
GB1438555A (en) 1976-06-09
IT991339B (it) 1975-07-30

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