US3860859A - 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

Info

Publication number
US3860859A
US3860859A US274638A US27463872A US3860859A US 3860859 A US3860859 A US 3860859A US 274638 A US274638 A US 274638A US 27463872 A US27463872 A US 27463872A US 3860859 A US3860859 A US 3860859A
Authority
US
United States
Prior art keywords
motor
coupled
switch
indicator
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US274638A
Other languages
English (en)
Inventor
Bruce Harry Buckley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Licensing Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US3860859A publication Critical patent/US3860859A/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
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • G05D3/1481—Control of position or direction using feedback using an analogue comparing device with discrete position sensor
    • 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

  • a remotely controlled shaft rotator wherein a local indicator-control device is driven by a regulated local reversible motor.
  • the local motor is initially responsive to a pulse derived at the remote drive unit for driving the indicator-control device a given amount as controlled by a cam operated switch.
  • ABSTRACT 9 Claims 4 Drawing Figures l REVOLUTION SYNCHRONIZER 55 MEMORY CAM 87 ROTATOR SYSTEM INCLUDING A REMOTE DRIVE MOTOR AND A LOCAL INDICATOR-CONTROL MOTOR
  • This invention relates to a rotator system and particularly to the use of a controlled, reversible electric motor in a rotator system to drive an indicator-control device that both indicates position of a remote rotating shaft and automatically deactivates the system when at l a preselected position.
  • Another technique for 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 eseapement 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 a preselected direction.
  • a system for rotating a remote shaft relative to a support and for providing an indication of the position of the shaft.
  • a first reversible drive unit includes a first reversible motor and a first drive train by which the first motor when energized drives the first drive train and a shaft.
  • a local movable indicator is coupled to a second drive unit including a second reversible motor and a second drive train. The second reversible motor in response to energizing potential drives the second drive train and the indicator.
  • a first switching means is coupled between a suitable source of potential and the first motor to operate the first motor to provide shaft rotation and movement of the first drive train.
  • a second switching means is coupled between a suitable source of potential and the second motor and is further responsive to each given movement of the first drive train to cause activation of the second motor.
  • a motor control means is responsive to the movement of the second drive train to control the energization potentials and the rotation of the second motor and the movement of the indicator coupled thereto.
  • FIG. 1 is a schematic diagram of a rotator system according to the present invention
  • FIG. 2 is a top plan view of the control unit of the antenna rotator system without connecting wires and transformer;
  • FIG. 3 is an elevation view of the local control unit of FIG. 2 as viewed in the direction of line 33;
  • 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 shaft rotator, remote drive unit 11, a local control unit 13 and four wires 15, 16, 17 and 19 interconnecting 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 located at a remote posi- 0 tion such as at an antenna mast supported from and extending above the roof top of a dwelling.
  • a transformer 21 which in response to 1]? volts AC at the primary 23 provides 20 volts AC at the secondary 25.
  • a main, onoff switch 27 is coupled in series with the primary 23 of transformer 21. When the contacts 27a and 27b of switch 27 are closed, the 1 17 volts AC is applied across the primary 23 and coupled to the secondary 25 of transformer 21. 1f the contacts 27a and 27b are open, the transformer 21 and consequently the overall system 10 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 are shown in simplified form in FIG. 1 and are tilted slightly so disk 54 can be seen. A more detailed description of this structure is discussed below in connection with FIGS. 2 and 3. Briefly, however, when a knob 81 is rotated clockwise or counterclockwise, the disk 54 that is mechanically coupled thereto is rotated clockwise or counterclockwise. Switch 27 which may be coupled to disk 54 turns with disk 54.
  • the indicator-control disk 53 is spaced parallel to and above preselector disk 54 on a shaft 83 (see FIG. 3).
  • Disk 53 is mounted so as to freely rotate on the shaft.
  • Disk 53 has an extension 84 thereon adapted so that when the disks 53 and 54 are aligned, an extension 84 pushes contact 27a away from contact 27b, deenergizing the system.
  • extension 84 is misaligned with switch 27, as when knob 81 rotates the disk 54 clockwise or counterclockwise, the contacts 270 and 27b being free of the extension 84 are closed and the system is energized.
  • the remote drive unit 11 includes an AC motor 31.
  • the drive unit motor 31 includes a pair of windings 31a and 31b. Coupled to the drive unit motor 31 is a gear train 33 (partially shown) and a rotatable shaft 35.
  • An antenna mast (not shown) may be fixed to the rotatable shaft 35. The shaft 35 and the mast is driven via the gear train 33 by drive unit motor 31.
  • One end 25a of secondary winding 25 is coupled by wire 16 to one end 32 of AC motor windings 31a and 31b.
  • the opposite end of the motor winding 31a is coupled over wire 19 to a terminal 41 of motor direction switch 43.
  • the opposite end of motor winding 31b is coupled by wire 17 to a second terminal 42 of motor direction switch 43.
  • a phase shifting capacitor 37 is coupled between wires 17 and 19 for providing phase shift therebetween and providing activation of the motor 31.
  • the other end 25b of secondary winding 25 is coupled to the center terminal 44 of motor direction switch 43.
  • Motor direction switch 43 is a flexible leaf contact switch with a flexible contact member 44a connected to terminal 44 and adapted, when flexed, to make contact with either contact member 42a connected to terminal 42 or with contact member 41a connected to terminal 41.
  • the drive unit motor 31 rotates clockwise for example, with the current going through wire 19 and winding 31a via contacts 44a and 41a.
  • contact member 44a is closed with contact member 42a, the drive unit motor 31 rotates in the opposite or counterclockwise direction with currents coupled via contact members 44a and 42a along wire 17 to winding 31b.
  • the motor direction switch 43 is, for example, fixed to disk 54. Also fixed to the disk 54 is a directionmemory cam 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.
  • the directionmemory cam 87 rotates counterclockwise and causes direction-memory cam 87 to push contact 44a into connection with contact 410.
  • the direction-memory cam 87 rotates clockwise and causes contact 44a to connect with contact 42a.
  • a local indication of the rotated position of the remotely located rotating shaft and hence the pointing direction of the antenna is provided by a pulsing circuit at the drive unit 11, a DC control unit motor 51, a syn chronizer cam 55, the indicator-control disk 53, a pair of rectifier diodes 65 and 67 and a pair of control switches 61 and 71.
  • the intermittent switch 47 has one terminal 48 connected to wire 16 and the other terminal 49 connected to one end 51a of the DC control unit motor 51.
  • the switch 47 has a pair of contacts 48a and 49a which are normally open.
  • a cam 45 which has a high point 45a which when driven by the drive unit motor 31 through the gear train 33 intermittently provides contact between contacts 49a and 48a of switch 47.
  • The'result is a pulse output and an energizing source of potential from switch 47 that is coupled by wire to DC control unit motor 51.
  • 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 a center contact member 66a positioned in gap 102 of the direction-memory cam 87.
  • a first terminal 68 of switch 61 is coupled to the anode of diode 67.
  • the cathode of diode 67 is coupled to end 25b of secondary 25.
  • Terminal 64 of switch 61 is coupled to the cathode of diode 65.
  • the anode end of diode 65 is coupled to the end 25b of secondary 25.
  • Diodes 65 and 67 each provide half wave rectification of the AC signal at the secondary 25.
  • diodes 6S and 67 are oppositely connected, current direction and DC control unit motor rotation direction is controlled by which of terminals 64 or 68 completes the circuit through the DC control unit motor 51.
  • the center leaf contact member 66a can make contact with either member 68a or 64a.
  • Contact member 68a is connected with terminal 68, and contact member 64a is connected with terminal 64.
  • the flexible contact member 66a is connected to terminal 66, and terminal 66 is coupled by wire 69 to terminal 51b of DC control unit motor 51.
  • the 20 volt AC is then half wave rectified by diode 65, and the DC current is coupled through contacts 64a and 66a and wire 69 to control unit motor 51, resulting in the control unit motor 51' rotating in a first direction.
  • knob 81 is rotated counterclockwise, cam 87 is rotated clockwise causing flexible contact 660 to make contact with member 68a.
  • the 20 volts AC is half wave rectified with current flowing through diode 67. contact members 66a and 68a, wire 69 and through control unit motor 51 to drive motor 51 in the other direction.
  • the DC control unit motor 51 is coupled by a gear train 52 to indicator-control disk 53 and to a synchronizing cam 55.
  • the synchronizing cam 55 has a raised or camming region 55a and a low or off region 55b.
  • a synchronizing switch 71 having a center flexible leaf contact member 72a, a contact member 73a and a contact member 74a is provided for controlling the DC control unit motor 51.
  • Terminal 72 of switch 71 is connected to center flexible member 72a.
  • Terminal 74 of switch 71 is connected through switch 71 to contact member 74a, and terminal 73 is connected through switch 71 to contact member 73a.
  • Terminal 74 is connected to wire 69 and end terminal 51b of DC control unit motor 51.
  • Terminal 73 is connected by wire 103 to wire 16.
  • Terminal 72 is coupled through 27 ohm resistor 101 and bypass charge capacitor microfarad) to terminal 51a of motor 51.
  • the synchronizing cam 55 is positioned relative to the flexible leaf contact member 72a so that when the raised region 550 is in contact with the member 72a, this member 72a makes contact with member 74a.
  • contact member 72a which is spring loaded or otherwise biased, makes contact with contact member 73a.
  • drive unit cam 45 makes one revolution for every 6 of rotation of the drive unit shaft 35.
  • synchronizing cam 55 is geared to make one revolution for every 6 turn by the indicator-control disk 53.-
  • the same ratio of turns that exists between drive unit cam 45 and the antenna shaft 35 (60 to 1) exists between the revolution synchronizer cam 55 and indicator-control disk 53.
  • Control unit motor 51 turns in response to the direction indicated by switch 61 so that synchronizing cam 55 is rotated from presenting its high or raised portion 55a to switch 71 to its low (or off the cam) position 55b.
  • switch member 720 makes contact with member 73a keeping the DC control unit motor 51 energized through the resistor-capacitor combination 101 and 105, contact member 72a, contact member 73a and wire 103 to a connection at wire 16.
  • member 72a breaks contact with member 73a and makes contact with member 74a to de-energize the control unit motor 51.
  • Motor resistor 101 and charging capacitor 105 operate to prevent the DC control unit motor from overdriving the high or raised portion 55a of the synchronizing cam 55.
  • Capacitor 105 charges against the direction of current through DC control unit motor 51 and resistor 101 acts as an additional load resistor in series with the DC control unit motor 51.
  • the speed of the DC control unit motor 51 is such that the synchronizer cam 55 turns faster than drive unit cam 45.
  • Control cam 55 is driven faster by DC motor 51 than is the cam 45 by the motor 31 so that cam member 55 turns one complete revolution and indicator-control disk 53 progresses 6 before the cam member 45 is able to make a second connection of members 48a and 49a at switch 47 and before shaft 35 and the antenna has rotated 6.
  • DC control unit motor 51 and cam member 55 then wait for another pulse from the drive unit 11.
  • FIGS. 2, 3 and 4 there is shown a top view and an elevation view respectively of the control unit 13 which includes the indicator-control disk 53 positioned in a given alignment above the disk 54.
  • the 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.
  • the 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 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 spacer portion 99.
  • a tooth shaped member 88 extends vertically and laterally from the base member 95.
  • a gap 104 exists between 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 disk 54 with the tooth-shaped extending member 88 positioned just below control disk 53.
  • a ring member 53a positioned below indicator-control disk 53 may be formedas an extension of disk 53 so as to extend about the periphery of this disk.
  • 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 tooth-shaped member 88 is lodged into slot 89 and the flexible contact members 66a 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 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 to drive the control disk 53 in the proper direction in response to impulses from the drive unit 11 to realign disk 53 with disk 54.
  • a system for rotating a remote shaft and for providing a local indication of the rotated position comprising:
  • a first driving means including a first reversible motor and a first drive train, said first reversible motor being responsive to energization potential applied thereto for driving said remote shaft and said first drive train,
  • a second driving means including a second reversible motor and a second drive train coupled to each other and said indicator and responsive to an energization potential applied thereto for driving said indicator
  • first switching means coupled between a suitable source of potential and said first motor for causing rotation of said shaft and movement of said first drive train
  • second switching means including a first cam and a first cam-operated switch driven by said first cam coupled between a suitable source of potential and said second motor and coupled to said first drive train responsive to a given movement of said first drive train to cause activation and rotation of said second motor and movement of said indicator,
  • motor control means including a second cam and a second cam-operated switch driven by said second cam coupled to said second drive train for controlling the rotation of said second motor to provide a predetermined movement of said indicator each time said first drive train moves said given amount.
  • a system for rotating a remote shaft and for providing a local indication of the rotated position thereof comprising: 7
  • a first driving means including a first reversible motor and a first gear train, said first reversible motor being responsive to energization potential applied thereto for driving said remote shaft and gear train,
  • first switching means coupled between a suitable source of potential for said first motor and said first motor for causing rotation of said shaft and movement of said first gear train
  • a second driving means including a second reversible 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
  • interrupting switch means coupled between a suitable source of potential for said second motor and said second motor and coupled to said first gear train for in response to a given movement of said first gear train causing momentary activation and rotation of said second motor and movement of said indicator
  • interrupting switch means includes a cam and a cam operated switch with said cam being driven by said first gear train and said switch being coupled between said suitable source of potential for said second motor and said second motor.
  • a system for automatically rotating a remote shaft to which an antenna may be coupled to a preselected position comprising in combination:
  • a first driving means including a first motor having reversing means, said first driving means coupled to said remote shaft for causing rotation thereof,
  • a second driving means including a second motor having reversing means
  • a first switching means coupled between said energization means and said first driving means in a manner to cause when in a first switch position said first driving means to rotate said shaft in a first direction or in a second switch position said first driving means to rotate said shaft in a second opposite direction
  • a second switch means coupled between said energization means and said second driving means in a manner to cause when in a first switch position said second driving means to drive said indicatorcontrol member in a first direction or in a second switch position said second driving means to drive said indicator-control member in a second reverse direction
  • said first and second switch means being coupled to a third switch means coupled to said members and said energization means for de-energizing said first and second motors only upon alignment of said disks.
  • a system for automatically rotating a remote shaft to which an antenna may be coupled to a preselected position comprising in combination:
  • a first driving means includinga first motor having reversing means, said driving means coupled to said remote shaft for causing rotation thereof,
  • a second driving means including a second motor having reversing means
  • a movable preselector disk and an indicator-control disk said indicator-control disk having a groove therein at a point near the periphery of said disk
  • a first single pole double throw switch having a flexible contact member coupled to said energization means and centered between two relatively fixed contact members with a first of said fixed contact members coupled to said first motor in a manner to cause said first motor to rotate in a first direction and with the second of the fixed contact members coupled to said first motor in a manner to cause said first motor to rotate in a reverse direction
  • a second single pole double throw switch having a flexible contact member coupled to said energization means and centered between two relatively fixed contact members with the first of said fixed contact members of said second switch coupled to said second motor in a manner to cause when said second switch is in a first position said second motor to rotate in a first direction and with the second of the fixed contact members of the second switch coupled to said second motor in a manner to cause when said second switch is in a second position said second motor to rotate in a reverse direction
  • a direction-memory cam having a pair of apertures therein adapted to receive said flexible contact members
  • said direction-memory cam being rotatably mounted said first switch being arranged with the center flexible contact member thereof extending into one aperture of said direction-memory cam to cause, when said preselector disk moves with respect to said indicator-control disk in a first non-aligned direetion, said flexible contact member thereof to contact said first fixed contact member of said first switch causing said first motor to rotate in said first direction and to cause, when said preselector disk moves with respect to said indicator-control disk in a second non-aligned direction said flexible contact member to contact said second fixed contact member thereof causing said first motor to rotate in said reverse direction,
  • said second switch being arranged with the center flexible contact member extending into the second aperture of said direction-memory cam to cause, when said preselector disk moves with respect to said indicator disk in said first non-aligned direction, the flexible contact member of the second switch to contact with said first fixed contact member thereof causing said second motor to rotate said indicator disk in said first direction unless said disks are aligned and to cause, when said preselector disk moves with respect to said indicator disk in said second non-aligned direction, said flexible contact member of the second switch to contact said second fixed contact member thereof causing said second motor to rotate said indicator disk in said reverse direction unless said disks are aligned.
  • said second motor is a DC motor and said reversing means for said second motor includes a pair of diodes wherein said first fixed contact member of said second switch is coupled to a first diode poled in one sense and said second fixed contact member of said second switch is coupled to the second diode poled in an opposite sense.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Control Of Stepping Motors (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Control Of Position Or Direction (AREA)
  • Control Of Ac Motors In General (AREA)
  • Selective Calling Equipment (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US274638A 1971-10-11 1972-07-24 Rotator system including a remote drive motor and a local indicator-control motor Expired - Lifetime US3860859A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4731071A GB1406994A (en) 1971-10-11 1971-10-11 Indicator drive for automatic rotator

Publications (1)

Publication Number Publication Date
US3860859A true US3860859A (en) 1975-01-14

Family

ID=10444497

Family Applications (1)

Application Number Title Priority Date Filing Date
US274638A Expired - Lifetime US3860859A (en) 1971-10-11 1972-07-24 Rotator system including a remote drive motor and a local indicator-control motor

Country Status (7)

Country Link
US (1) US3860859A (cg-RX-API-DMAC10.html)
JP (1) JPS4845785A (cg-RX-API-DMAC10.html)
CA (1) CA977409A (cg-RX-API-DMAC10.html)
DE (1) DE2249806C3 (cg-RX-API-DMAC10.html)
FR (1) FR2157385A5 (cg-RX-API-DMAC10.html)
GB (1) GB1406994A (cg-RX-API-DMAC10.html)
IT (1) IT967946B (cg-RX-API-DMAC10.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025858A (en) * 1974-01-16 1977-05-24 Nobutoshi Ohuchi Locating apparatus
US4109191A (en) * 1977-06-03 1978-08-22 Rca Corporation Rotator with remote indicator and self-synchronization
US6069462A (en) * 1992-03-18 2000-05-30 Flynn; Eamonn Remote control antenna rotor system
US20060156841A1 (en) * 2002-11-29 2006-07-20 Muldowney-Colston Tony E Rotating electrical machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938862C1 (de) 1999-08-17 2001-03-15 Kathrein Werke Kg Hochfrequenz-Phasenschieberbaugruppe
DE10104564C1 (de) 2001-02-01 2002-09-19 Kathrein Werke Kg Steuerungsvorrichtung zum Einstellen eines unterschiedlichen Absenkwinkels insbesondere von zu einer Basisstation gehörenden Mobilfunkantennen sowie eine zugehörige Antenne und Verfahren zur Veränderung eines Absenkwinkels

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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025858A (en) * 1974-01-16 1977-05-24 Nobutoshi Ohuchi Locating apparatus
US4109191A (en) * 1977-06-03 1978-08-22 Rca Corporation Rotator with remote indicator and self-synchronization
US6069462A (en) * 1992-03-18 2000-05-30 Flynn; Eamonn Remote control antenna rotor system
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
JPS4845785A (cg-RX-API-DMAC10.html) 1973-06-29
DE2249806A1 (de) 1973-04-19
FR2157385A5 (cg-RX-API-DMAC10.html) 1973-06-01
IT967946B (it) 1974-03-11
DE2249806C3 (de) 1975-02-06
CA977409A (en) 1975-11-04
DE2249806B2 (de) 1974-06-12
GB1406994A (en) 1975-09-24

Similar Documents

Publication Publication Date Title
US3023348A (en) Motor control system
US3644027A (en) Random selection system for a slide projector
US3860859A (en) Rotator system including a remote drive motor and a local indicator-control motor
US2449178A (en) Step-by-step automatic tuning control
US1684138A (en) Means for reproducing position
US2422180A (en) Antenna positioning control
US3831074A (en) Rotator system including a remote drive motor and a local indicator-control motor
US2427621A (en) Remote-control system
US2405628A (en) Control device
US2204065A (en) Motor driven tuning system
US3256473A (en) Indexing control system
US3041609A (en) Directional-antenna rotator
US3328659A (en) Switching apparatus for plural step motors connected by differential gearing
US2790121A (en) Antenna rotator and control system
US2416229A (en) Control apparatus for reversible motors
US1956419A (en) Remote control system for radio receiving apparatus and the like
US2424859A (en) Control apparatus for reversible motors
US2711527A (en) Directional control mechanism for antennas
US2504492A (en) Bomb release system
US2911636A (en) Angular position indicating system
US2440838A (en) Remote position control system
US2486082A (en) Synchronizing mechanism
US2809335A (en) Incremental stepper motor
US2565649A (en) Direction-responsive control arrangement for reversible motors
US2861265A (en) Rotator

Legal Events

Date Code Title Description
AS Assignment

Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RCA CORPORATION, A CORP. OF DE;REEL/FRAME:004993/0131

Effective date: 19871208