US2218088A - Automatic tuning for radio receiving apparatus - Google Patents

Automatic tuning for radio receiving apparatus Download PDF

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Publication number
US2218088A
US2218088A US233188A US23318838A US2218088A US 2218088 A US2218088 A US 2218088A US 233188 A US233188 A US 233188A US 23318838 A US23318838 A US 23318838A US 2218088 A US2218088 A US 2218088A
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United States
Prior art keywords
motor
lever
contact
guide tracks
disc
Prior art date
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Expired - Lifetime
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US233188A
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English (en)
Inventor
Horowitz Alexandre
Knos Gunnar Borge
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RCA Corp
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RCA Corp
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Publication date
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Publication of US2218088A publication Critical patent/US2218088A/en
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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/14—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings operated by auxiliary power
    • H03J5/16—Settings determined by a number of separate positioning means actuated by hand
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/14—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings operated by auxiliary power
    • H03J5/146—Settings desired by a switch controlled together with the tuning member and which stops the control as soon as a desired position is reached

Definitions

  • Radio receiving apparatus adapted to be automatically tuned to a plurality of pre-determined stations with the aid of a station selector' conslsting of a selector disc, a key-board or asimilar '5 device are already known.
  • a positiondetermining disc which is coupled with the shaft of the tuning condenser and which is equipped with two guide tracks which difl'er in operative height and with which cooperates a member for the motor by which the tuning members are ad- Justed.
  • the positiondetermining disc consists as a rule of a flat disc provided at its circumference with two circular guide tracks which, having different diameters are also different in operative height.
  • the operative height of the guide tracks we mean hereinafter the height of the operative guide portions with respect to a fixed plane.
  • these position-determining discs are mounted on the shaft of the movable portion of the tuning condenser. Owing to the manipulation ofa tuning member, for example, a pushbutton corresponding to one of the stations which are to be automatically tuned, an actuating member for the motor which actuates the tuning members, in the present instance the rotor of the tuning condenser, comes into contact with one of both portions of the guide track with the result, that the motor starts rotating and continues to rotate until the actuating member for the motor attains the point where the one guide track merges into the other track on the position disc under consideration.
  • the position-determining discs'on the shaft of the tuning condenser it is achieved that at the moment whenv the actuating member is at the point where the one guide track merges into the other, correct tuning of the condenser is obtained.
  • the invention relates to'a radio receiving apparatus of the above-described kind, wherein, however, owing to the particular shape of the guide tracks, it is achieved that automatic tuning is effected with considerably greater precision than in the known devices.
  • the apparatus according to the invention is characterised in that each of the two guide tracks with different operative heights which are provided on the position-determining discs which are driven at a higher speed than the shaft of the. condenser devices.
  • the transmission between the shaft of the position-determining disc and the shaft of the movable condenser portion must be chosen in proportion to the length of each of the guide tracks. 5
  • the guide tracks are provided in the form of helical lines on the cylindrical outer surface of the positiondetermining discs.
  • the guide tracks are provided in the form of spirals on one of the, preferably flat, terminal faces of the disc.
  • the discs are consequently formed more or less as drums and the shaft on which the discs are mounted is preferably horizontally disposed.
  • the position discs may be formed as gramophone records, in the sense that in this case'the groove usually present in such a record has two diiferentproflles, for example, depths.
  • the shaft of the discs is preferably arranged in this case so as to occupy a vertical position.
  • the shaft on which the discs are 45 mounted must be driven at an increased speed with respect to the shaft of the tuning condenser.
  • the two guide tracks on each position disc are separated by a portion which gradually passes from the operative height of the oneguide track to that of the other.
  • the two guide tracks on each position disc are separated by a contact surface which makes an angle of 90 or less with the guide track of larger operative height.
  • the guide tracks may have different forms. They may be formed, for example, by grooves in the surface of the position discs. According to the invention it is alternatively possible to constitute them by ridges on the position discs which are separated from one another by depressions.
  • Fig. l discloses the automatic control mechanism associated with the tuning element of a radio receiver according to the invention
  • Figs. 2 and 3 are views in cross-section and perspective respectively of one of the tuning element position-determining discs
  • Fig. 4 discloses in diagrammatic fashion the cooperation of the motor control switch, one of the push button mem-- bers and its associated disc
  • Figs. 5-7 are modifled forms of position-determining discs that may be employed
  • Fig. 8 is a cross-sectional viewof the form shown in Fig. 7.
  • the'tuning element of the radio receiver is represented by the usual tuning condenser, the rotor 2 of which is mounted on a shaft I which supports, in addition, a gear wheel 4 which meshes with a pinion 3.
  • the pinion 3 is mounted on a shaft 5 which carries at one end a tuning knob 5 and at the other end the rotor of a tuning motor 1.
  • the shaft 5 has mounted thereon four position-determining discs 8, 9, I and II which are formed as drums and on which helical guide tracks are provided. It may be noted that each of these discs co-operates with an actuating member (I2, I3, I4 and I) for the tuning motor 1.
  • actuating members are mounted on arms I6, I1, I8 and i9 (shown in perspective) which are adapted to rotate about spindles 20, 2
  • This construction makes it possible for the members actuating the motor to perform, when the shaft 5 rotates, a reciprocating motion as is shown in Fig. 1 for the member I2, said motion being required to be enabled to follow the course of the helical grooves'24, 25, 25 and 21 in the position discs 8, 9, I0 and N.
  • Fig. 2 represents in transverse section the position disc 8 which is constituted here by a moulding.
  • This disc is mounted by a hub 23 on the shaft 5 and the drumlike outer surface has two helical guide tracks which have different operative heights (hi larger than hz)
  • the guide track of larger operative height hl is denoted by 29 and the guide track with the smaller operative height 112 is designated by 30.
  • Fig. 3 represents a perspective view of the disc 8, the situation of the helical guide tracks on the drum-like surface of the disc 3 may be clearly seen from this figure.
  • the guide track 29 with 'the larger operative height hl merges into the guide track 39 with the 1 smaller operative height hz through a depression a smaller operative height than the two guide
  • the base of this depression has a smaller operative height than have the guide tracks 29 and 30.
  • a lever 33 carrying at its end a feeler 34 whose lower end rests upon manipulation of a push-button 35, on the base of one of the guide tracks 29 and 30, is pivoted on a point 52.
  • the lever 33 has an extension 36 which is provided at its upper end with a projection 31.
  • the push-button 35 is provided on a lever 39 which is pivoted on a point 39; it may be noted that between the levers 38 and 33 there is provided a blade spring 40 which, when the push-button 35 is depressed, exerts on the lever 33 a pressure which is directed downwardly.
  • the lever 33 is furthermore provided with an extension 4
  • contact springs 43, 44 and 45 which are provided with contacts 46, 41 and 43.
  • the projections 31 and 42 enter between the contact springs 43, 44 and 45.
  • the contact spring 43 is formed in such manner that it always tends to move, as is shown, in the direction of the arrow 1:, that is to say downwardly, whereas the contact spring 45 always has a tendency to move upwardly, as is indicated by the arrow 1/.
  • the contact springs 43 and 45 have each connected thereto a current supply conductor 43' and 45' respectively.
  • the stator of the motor is provided with two oppositely wound windings 43" and 45'. which are connected to the contact springs 43 and 45 through their 'respective supply conductors 43' and 45.
  • source of power supply S is connected between the current supply conductor 44' of the contact spring 44 and the conductor connecting the two motor windings.
  • the feeler 34 could be depressed only over a smaller distance than in the first-described instance.
  • the projection 42 would haveallowed the lever 66 to move downwardly with'the result that the contacts 66 and 61 would have come into contact with one another and the motor now energized by the winding 66" would have From Fig, 4 it may furthermore be seen that the lever 66 can pivot, in a plane perpendicular to the 291 plane of the drawing, on the spindle 66 which is f sirnilar to the spindles 26, 2
  • Fig. 5 represents one embodiment of the position disc in aradio receiving apparatus according to the invention, wherein two helical guide tracks SI and 62, whose portions shown in the figure are represented for simplicity as being located in one height he of the portion 6
  • a lever 65 whose finger 66 provided. at the end thereof bears permanently on one of the guide tracks 52 and Si so that the said finger always follows the course of the guide tracks.
  • the lever 66 is connected by means of a conductor 61 to one of the terminals of the motor, which actuates the tuning means, said motor not being shown.
  • This lever carries a contact 66. Above and below the lever 66 there are provided contacts 69 and 66.
  • the motor rotates lefthandedly or right-handedly until the finger 66 attains the transition 66 between the two guide tracks, owing to which the contact 66 is connected neither to the contact 66 nor to the contact 66, so that the motor energizing circuit is broken and the tuning condenser remains in this position.
  • the two helical guide tracks 66 and 66 whoseportions shown in Fig. 6 are represented for simplicity, as in Fig. 5, as located in a single plane, are separated by a contact surface 66 which makes in this instance an angle a of 90 with the track 66. If desired, this angle a may have a smaller value.
  • the lever 66 is provided with a contact 66 which makes contact in this instance with a resilient'contact III which has secured thereto a winding H of the motor for the tuning means 12, which motor is not shown.
  • lever 12 Below the lever 68 there is arranged a further lever 12 provided with a contact 13. This lever has secured thereto a winding 16 of the motor which is oppositely'wound with respect to the winding II.
  • the lever 66 is connected by a wire 16 to the other terminal of the motor.
  • the angle lever 66 raises the lever 66, owing to the fact that the angle lever rests on the guide track", with the result that the contact 66 engages the contact 16 and the motor and therefore the position disc shown start rotating in right-handed direction.
  • the angle lever drops from the guide track 66 on the track 66 with the result that the contact 66 engages the.contact '
  • Fig. 7 represents a form of construction of a position disc wherein the guide tracks are provided in the form of spirals on the flat terminal face ofthe position disc.
  • a position disc 11 is mounted on a shaft 16: the guide track with the larger operative height extends from A to B and that with the smaller operative height from B to C.
  • the transition from the one guide track into the other is located at the point B; this transition may be formed in any tion-the guide tracks are formed by ridges l6 and 66 of the larger and. smaller operative height, respectively, the ridges being separated from one another by depressions 6
  • the grooves are hereassumed toextend helically on the cylindrical drum-like surface of the position disc.
  • an actuating member 62 of .the motor which member is formed in this instance as a strap and is secured to a lever 66 which, being pivoted on a point 64, is enabled to follow the course of the guide tracks.
  • Mechanism for automatically adjusting a shaft to a plurality of predetermined positions comprising a reversible motor for driving said shaft, a plurality of shaft position-determining discs also driven by said motor, there being one such disc for each of the predetermined shaft positions, each disc being provided with two guide tracks which extend over an angle greater than 180 and which are spaced at different radial distances from the shaft supporting the discs, switch' mechanism for'controlling the direction of motor operation having a plurality of control members each cooperating with the guide tracks of one of the discs, and manuallyoperated means for causing the selective cooperation of a particular control member with the guide tracks of its associated disc whereby the motor is actuated to operate in the proper direction for adjusting the shaft to the predetermined position.
  • each of the position-determining discs is in the form of a drum and the guide tracks are formed of said drum.
  • each of the position-determining discs is in the form of a flat disc and the guide tracks are in the form of spirals formed on the fiat surface gradually merges from the operative height or of the disc. one guide track into that of the other.
  • Mechanism as defined in claim 1 wherein 7.

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US233188A 1938-03-18 1938-10-04 Automatic tuning for radio receiving apparatus Expired - Lifetime US2218088A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE211388X 1938-03-18

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US2218088A true US2218088A (en) 1940-10-15

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US (1) US2218088A (en(2012))
BE (1) BE433298A (en(2012))
CH (1) CH211388A (en(2012))
FR (1) FR851761A (en(2012))
GB (1) GB523881A (en(2012))
NL (1) NL56204C (en(2012))

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CH211388A (de) 1940-09-15
GB523881A (en) 1940-07-24
NL56204C (en(2012))
FR851761A (fr) 1940-01-15
BE433298A (en(2012))

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