US2491341A - Tuning mechanism - Google Patents

Tuning mechanism Download PDF

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Publication number
US2491341A
US2491341A US792589A US79258947A US2491341A US 2491341 A US2491341 A US 2491341A US 792589 A US792589 A US 792589A US 79258947 A US79258947 A US 79258947A US 2491341 A US2491341 A US 2491341A
Authority
US
United States
Prior art keywords
cord
pulley
tuning
peripheral surface
point
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
US792589A
Other languages
English (en)
Inventor
John E Tillman
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to BE486369D priority Critical patent/BE486369A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US792589A priority patent/US2491341A/en
Priority to FR976934D priority patent/FR976934A/fr
Application granted granted Critical
Publication of US2491341A publication Critical patent/US2491341A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/06—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by movement of core or part of core relative to the windings as a whole
    • H01F21/065—Measures for obtaining a desired relation between the position of the core and the inductance
    • 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
    • H03J1/06—Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
    • H03J1/10—Rope drive; Chain drive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/1836—Rotary to rotary
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18832—Reciprocating or oscillating to or from alternating rotary including flexible drive connector [e.g., belt, chain, strand, etc.]
    • Y10T74/18848—Reciprocating or oscillating to or from alternating rotary including flexible drive connector [e.g., belt, chain, strand, etc.] with pulley

Definitions

  • My invention relates to tuning mechanism and more particularly, to mechanisms employed for tuning resonant circuits such as those used in,radio transmitting and receiving apparatus. It is a primary object of my invention to provide improved tuning .means for such resonant cir-' cuits.
  • a particular object of my invention is to provide a tuning mechanism for radio apparatus which obtains a linear relationship between the frequency and the tuning drive.
  • A'further object of my invention is to provide means for tuning a radio receiver such that a linearly calibrated dial may be employed as an indicator of the receiver frequency.
  • a more specific object of my invention is to provide a permeability tuner, using constant" pitch coils and cylindrical iron cores, for radio apparatus and the likewhich obtains a linear relationship between the frequency of operation and the position of the control knob.
  • Fig. 1 is a fragmentary perspective view of a tuning mechanism suitably embodying my invention
  • Fig. 2 is a detail view of the spiral pulley member of Fig. 1
  • Figs. 3 and 4 are fragmentary side elevations of the actuating mechanism of the tuner of Fig. 1
  • Fig. 5 is a fragmentary bottom view of the mechanism of Fig. 3.
  • Like reference numerals indicate like elements in the several figures.
  • a tuning mechanism comprising a fixed supporting member .I and a sliding frame 2.
  • the sliding frame 2 is provided with an equal number of cylindrical compressed powdered iron cores or slugs 5 suitably positioned for insertion in the coil forms 3. Adjusting screws 8 are provided, by which means the iron cores 5 may be individually positioned with respect to the sliding frame 2.
  • a guide member I is attached to the sliding frame 2.
  • a supporting member 3 is provided at one end of the guide member I, and
  • I provide a conventional pulley-and-cord arrangement comprising a control knob ill, an indicating dial Ii, and three pulleys I2. l3, l4 mounted on parallel shafts i5, i6, II.
  • the dial ii is provided with suitable linearly spaced indicia I 8.
  • a cord IQ of suitable length and hearing a pointer 20, is wound around the pulleys 12,
  • cord tension is maintained by means of a spring 2
  • I provide a spiral-cut pulley member 23 mounted on the drive shaft H.
  • a wire rope or other cord 24 is fastened at each end to the two members 8, 8 at the ends of the guide member 1. and is wound on the pulley member 23 in a manner to be hereinafter more fully described.
  • FIG. 2 there is shown the spiralcut pulley' 23 mounted on the drive shaft IT.
  • the form of member 23 is essentially that generated when a wedge-shaped inclined plane is wound continuously about a cylinder.
  • the peripheral surface 25 follows a curve which is substantially that of an Archimedes spiral.
  • the trans verse surfaces 26 are hereinafter referred to as the ramp surfaces, since these surfaces constitute the ramp of the aforementioned inclined plane.
  • the peripheral surface 25 is undercut to provide a root or seat for the cord 24 against the ramp surface 26.
  • the pulley member 23 is provided with a longitudinal hole 21.
  • the cord 24 is wound continuously around the pulley 23, in such a way that the length of cord on the pulley is always constant. This is accomplished by winding the cord 24 around the peripheral surface 25 and through the hole 21 so that, on rotating the drive shaft l1, the cord 24 simultaneously winds in one direction and unwinds from the same surface in the other direction.
  • Fig. 3 shows the drive mechanism of the device of Fig. 1 with the cord 24 unwinding from the smallest diameter of the spiral-cut pulley. This position corresponds to the highest frequency tuning point of the associated radio apparatus.
  • the iron cores I (Fig. 1) are totally withdrawn from the coils 4.
  • the sliding frame 2 carrying the iron cores 5 (Fig. 1) is caused to move to the left, thereby progressively inserting the cores 5 in the coils 4 (Fig. 1) and decreasing the operating frequency.
  • the cores I are inserted in the coils 4 at a varying rate while the pointer 20 moves at constant speed.
  • both ends of both portions of cord 24 wound on pulley 23, leave the spiral pulley member 23 at essentially the same point 28. Furthermore, one end of the cord 24 is fastened to a point 29 on the supporting member 8 which is in transverse and longitudinal alignment with the peripheral surface of smallest radius of the spiral pulley 23. The other end of the cord 24 is fastened to a point 30 on the supporting and adjusting member 9 which is in transverse and longitudinal alignment with the peripheral surface of the largest radius of the pulley 23.
  • the line of action of the cord 24, i. e. the straight line between points 29 and 30 along which force is applied to move frame 2 is fixed and always tangent to the peripheral surface 25 at a point 28 at which the cord leaves the pulley 23.
  • the cord 24 also lies fiat against the ramp surface at the point of tangency 28.
  • the developed locus of the peripheral surface of the pulley member 23 is substantially coincident with the line of action of the drive cord 24.
  • the sliding frame is shown in a position corresponding to the lowest operating frequency. It will be observed that in this position, cord 24 is tangent at a point 28 on the peripheral surface of largest diameter of the pulley 23.
  • Fig. 5 is a fragmentary bottom view of the mechanism of Fig. 3. This figure shows more clearly the transverse locations of the fastening points 29, 30 with respect to the pulley member 23. Fastening point 29 is shown in transverse alignment with a point 32 on the peripheral surface of smallest radius, and fastening point 30 is shown in transverse alignment with a point 33 on the peripheral surface of largest radius. Cord 24 always maintains a substantially straight line between fastening points 29, 30.
  • my invention provides simple and effective means for tuning radio apparatus over a band of frequencies.
  • the advantages of inductance tuning are obtained, and linear dial calibration is provided without the use of variable pitch coil windings or specially shaped' tuning cores.
  • my invention provides simple means for converting uniform linear motion to a related nonuniform linear motion.
  • the uniform motion may be imparted to the cord l9, (Fig. 1), and the cord 24 may be attached to the member to which the desired nonuniform motion is to be imparted.
  • Apparatus for converting a given uniform linear motionto a related nonuniform linear motion comprising a first cable to which said uniform linear motion is imparted, a system of coplanar circular pulleys, said first cable being frictionally engaged on said pulleys, a drive shaft fixed on one of said pulleys, a pulley member of varying radius fixed on said shaft, a second cable continuously wound on said pulley member, a traveling member, the respective ends of said second cable being attached to spaced points on said traveling member positioned on opposite sides of said pulley member, said points being so located that the developed locus of the peripheral surface of said pulley member is substantially coincident with the line of action of said second cable, said second cable being in positive frictional engagement with said pulley member, whereby said nonuniform motion is imparted to said traveling member.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stringed Musical Instruments (AREA)
US792589A 1947-12-18 1947-12-18 Tuning mechanism Expired - Lifetime US2491341A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE486369D BE486369A (fr) 1947-12-18
US792589A US2491341A (en) 1947-12-18 1947-12-18 Tuning mechanism
FR976934D FR976934A (fr) 1947-12-18 1948-12-16 Dispositif perfectionné d'accord pour postes de radio et analogues

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US792589A US2491341A (en) 1947-12-18 1947-12-18 Tuning mechanism

Publications (1)

Publication Number Publication Date
US2491341A true US2491341A (en) 1949-12-13

Family

ID=25157415

Family Applications (1)

Application Number Title Priority Date Filing Date
US792589A Expired - Lifetime US2491341A (en) 1947-12-18 1947-12-18 Tuning mechanism

Country Status (3)

Country Link
US (1) US2491341A (fr)
BE (1) BE486369A (fr)
FR (1) FR976934A (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642746A (en) * 1950-12-21 1953-06-23 Du Mont Allen B Lab Inc Television tuning device
US2780105A (en) * 1953-07-15 1957-02-05 Int Standard Electric Corp Operating mechanism
US2844039A (en) * 1954-11-20 1958-07-22 Philips Corp Dial indicator driving arrangement
US2874588A (en) * 1954-09-24 1959-02-24 Rockwood Sprinkler Co Control cable device with tensioning means
US2901764A (en) * 1956-01-30 1959-09-01 John W Anderson Motion-transmitting assembly
US2909934A (en) * 1956-02-13 1959-10-27 Sarkes Tarzian Television tuner
US2948887A (en) * 1955-06-06 1960-08-09 Giannini Controls Corp Pressure responsive instrument
US3011034A (en) * 1957-03-20 1961-11-28 Gen Motors Corp Linear scale timer
US3195370A (en) * 1963-03-18 1965-07-20 Hall C M Lamp Co Remote control unit
US3466937A (en) * 1967-01-09 1969-09-16 Gilbert M Motis Linear to rotational movement converter
US3546955A (en) * 1968-11-29 1970-12-15 Zeiss Jena Veb Carl Devices for transmitting motion in an apparatus to an adjustable index
US3668924A (en) * 1970-07-06 1972-06-13 Philco Ford Corp Tuner drive apparatus
US3739649A (en) * 1970-10-20 1973-06-19 Csi Liquidating Corp Linear position converter
US20150027249A1 (en) * 2013-07-25 2015-01-29 Liftwave, Inc. Dba Rise Robotics Differential conical drive
US20170354095A1 (en) * 2016-06-13 2017-12-14 Fiskars Finland Oy Ab Pruning shears

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR46854E (fr) * 1935-05-22 1936-10-30 Cadran sonore pour poste récepteur radiophonique
US2260985A (en) * 1940-08-13 1941-10-28 Crowe Name Plate & Mfg Co Radio control device
US2286283A (en) * 1939-02-20 1942-06-16 Johnson Lab Inc Multiplying operating mechanism for permeability tuning purposes
US2370714A (en) * 1942-09-30 1945-03-06 Rca Corp Variable permeability tuning device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR46854E (fr) * 1935-05-22 1936-10-30 Cadran sonore pour poste récepteur radiophonique
US2286283A (en) * 1939-02-20 1942-06-16 Johnson Lab Inc Multiplying operating mechanism for permeability tuning purposes
US2260985A (en) * 1940-08-13 1941-10-28 Crowe Name Plate & Mfg Co Radio control device
US2370714A (en) * 1942-09-30 1945-03-06 Rca Corp Variable permeability tuning device

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642746A (en) * 1950-12-21 1953-06-23 Du Mont Allen B Lab Inc Television tuning device
US2780105A (en) * 1953-07-15 1957-02-05 Int Standard Electric Corp Operating mechanism
US2874588A (en) * 1954-09-24 1959-02-24 Rockwood Sprinkler Co Control cable device with tensioning means
US2844039A (en) * 1954-11-20 1958-07-22 Philips Corp Dial indicator driving arrangement
US2948887A (en) * 1955-06-06 1960-08-09 Giannini Controls Corp Pressure responsive instrument
US2901764A (en) * 1956-01-30 1959-09-01 John W Anderson Motion-transmitting assembly
US2909934A (en) * 1956-02-13 1959-10-27 Sarkes Tarzian Television tuner
US3011034A (en) * 1957-03-20 1961-11-28 Gen Motors Corp Linear scale timer
US3195370A (en) * 1963-03-18 1965-07-20 Hall C M Lamp Co Remote control unit
US3466937A (en) * 1967-01-09 1969-09-16 Gilbert M Motis Linear to rotational movement converter
US3546955A (en) * 1968-11-29 1970-12-15 Zeiss Jena Veb Carl Devices for transmitting motion in an apparatus to an adjustable index
US3668924A (en) * 1970-07-06 1972-06-13 Philco Ford Corp Tuner drive apparatus
US3739649A (en) * 1970-10-20 1973-06-19 Csi Liquidating Corp Linear position converter
US20150027249A1 (en) * 2013-07-25 2015-01-29 Liftwave, Inc. Dba Rise Robotics Differential conical drive
US9121481B2 (en) * 2013-07-25 2015-09-01 Liftwave, Inc. Differential conical drive
US20160091065A1 (en) * 2013-07-25 2016-03-31 Liftwave, Inc. Dba Rise Robotics Differential conical drive
US9982762B2 (en) * 2013-07-25 2018-05-29 Liftwave, Inc. Differential conical drive
US20170354095A1 (en) * 2016-06-13 2017-12-14 Fiskars Finland Oy Ab Pruning shears
US10398088B2 (en) * 2016-06-13 2019-09-03 Fiskars Finland Oy Ab Pruning shears with frusto-conical wheel

Also Published As

Publication number Publication date
BE486369A (fr)
FR976934A (fr) 1951-03-23

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