US2226751A - Radio receiver tuning mechanism - Google Patents

Radio receiver tuning mechanism Download PDF

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Publication number
US2226751A
US2226751A US211492A US21149238A US2226751A US 2226751 A US2226751 A US 2226751A US 211492 A US211492 A US 211492A US 21149238 A US21149238 A US 21149238A US 2226751 A US2226751 A US 2226751A
Authority
US
United States
Prior art keywords
tuning
shaft
condenser
radio receiver
tuning mechanism
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
US211492A
Other languages
English (en)
Inventor
Carel Jan Van Loon
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 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 US2226751A publication Critical patent/US2226751A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/18—Control by auxiliary power

Definitions

  • the invention relates to a radio-receiving apparatus wherein a difierential mechanism is connected between the spindle of the tuning condenser and the driving mechanism for this condenser.
  • a difierential mechanism is connected between the spindle of the tuning condenser and the driving mechanism for this condenser.
  • One of the members of this mechanism which are movable with respect to the driving shaft of the difierential mechanism may cooperate in this case witha braking device whereas the other member of this mechanism which is movable with respect to said shaft actuates the spindle of the tuning condenser.
  • the construction according to the invention is particularly advantageous if in such apparatus tuning is effected with the aid of a motor.
  • the tuning condenser must be stopped at once after the correct tuning to some station or other has been effected.
  • the velocities of rotation of the movable members of the differential mechanism may be altered or compensated in this case in some way or other with the result that the transmission which is generally present between the shaft of the driving mechanism and the spindle of the tuning condenser is altered or suppressed respectively.
  • one of the members of the differential mechanism may co-operate with a braking device by which said member is held fast when the apparatus is not tuned to any station.
  • the tuning condenser Due to the friction the tuning condenser remains stationary and the above-mentionedbodies, which remain in motion owing to the driving shaft, utilise the member coupled with the tuning condenser as a pushingof! member so that now the member co-operating with the braking device starts rotating. If it is desired to leave the station once chosen, the braking device is actuated anew with the result that the-initial state is restored. Thus it is conlili sequently possible to stop the spindle of the tuning condenser at once although the driving shaft may still remain in rotary motion.
  • braking is effected with the aid of an electro-rnagnetic brake.
  • the exciting coil may remain immovable so that a material simplification in the construction of the apparatusis obtained.
  • the differential mechanism may be formed in different ways; it may consist, for example, of a
  • a shaft which is journalled in bearings I and 2 is connected to the driving member.
  • the spindle of the tuning condensers represented by the block III.
  • a bush 4 is free to rotate on the shaft 3, said bush having apertures 5 into which flt balls 6.
  • At one end said bush is provided with a pulley I on which runs a cord or cable 8 which is also led over a pulley 9 which is rigidly mounted on the spindle l0. 0n the inside as well as on the outside the balls 6 protrude from the member 4 and, being clamped with a certain pressure, they run on the one hand in a path H formed in the shaft 3 and on the other hand in a path I! provided in a member l3.
  • the latter member co-operates with an electromagnetic brake H which is formed by a core I! surrounded by a plurality of wire-turns l6.
  • the device operates as follows:
  • the construction represented may also be successfully utilised in those cases in which the shaft 3 is actuated by hand, itls particularly advantageous if, as has previously been observed, the shaft 3 has mounted on it a motor which serves to actuate the condenser so that when tuning is effected this motor may be allowed to run down without any disadvantage.
  • control apparatus for a radio' receiver provided with timing mechanism, a driving shaft adapted to control adjustment of the tuning mechanism, gear means loosely mounted on said shaft and having an extension bushing which is provided with a ball cage, a race way formed in the driving shaft, a member having a second raceway formed'therein and adapted to cooperate with the balls inthe ball cage, the loosely mounted gear means and its extension remaining stationary and said member assuming rotary motion so long as the driving shaft is in motion,
  • Incontrol apparatus for a radio receiver provided with tuning mechanism, a driving shaft adapted to control adjustment of the tuning ,mechanism, a pulley loosely mounted on said shaft, a second pulley rigidly connected to the tuning mechanism, a cable entrained about said two pulleys, the loosely mounted pulley having an extension bushing which is provided with a ball cage, a raceway in the driving shaft, a.

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  • Toys (AREA)
US211492A 1937-07-26 1938-06-03 Radio receiver tuning mechanism Expired - Lifetime US2226751A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE207285X 1937-07-26

Publications (1)

Publication Number Publication Date
US2226751A true US2226751A (en) 1940-12-31

Family

ID=5793637

Family Applications (1)

Application Number Title Priority Date Filing Date
US211492A Expired - Lifetime US2226751A (en) 1937-07-26 1938-06-03 Radio receiver tuning mechanism

Country Status (3)

Country Link
US (1) US2226751A (de)
CH (1) CH207285A (de)
FR (1) FR841090A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834886A (en) * 1955-02-14 1958-05-13 Motorola Inc Tuning apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834886A (en) * 1955-02-14 1958-05-13 Motorola Inc Tuning apparatus

Also Published As

Publication number Publication date
CH207285A (de) 1939-10-15
FR841090A (fr) 1939-05-10

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