US2297389A - Drive for electric tuning means - Google Patents

Drive for electric tuning means Download PDF

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Publication number
US2297389A
US2297389A US287193A US28719339A US2297389A US 2297389 A US2297389 A US 2297389A US 287193 A US287193 A US 287193A US 28719339 A US28719339 A US 28719339A US 2297389 A US2297389 A US 2297389A
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US
United States
Prior art keywords
coils
drum
tuning
drive
tuning means
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
US287193A
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English (en)
Inventor
Brandholt Kurt
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2297389A publication Critical patent/US2297389A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/40—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/44—Driving mechanisms, i.e. for transmitting driving force to the contacts using Geneva movement
    • 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
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20474—Rotatable rod, shaft, or post
    • Y10T74/20492—Gear
    • Y10T74/20498—Variable ratio

Definitions

  • the coil drum which serves for tuning adjustments is set in motion by a tuning operation.
  • This operation is to be effected by a gear train, which has a variable transmission ratio, which may, for example, be accomplished by elliptical or other odd-shaped gears; and it is so designed that by a change of the transmission ratio from step-down to step-up to step-down position again the drum reaches a position of rest, the momentum acquired by the drum while the high gear ratio is effective being gradually reduced as the effective gear ratio becomes lower.
  • a coil-drum I carrying a plurality of coils 20A20D is shown to be geared through a gear train 2, 3, 4, 5, and a toothed disc 6 operates to apply contacts I to the difierent coils for different positions of the drum, in the desired circuit such as the tuning condenser.
  • These contacts I can be controlled by an insulated spring contact support 8. Tension from the spring l0 forces a ratchet arm 9 to follow the recesses of the disc 6.
  • a further feature of the invention is that the contacts I are removed from the drum until a setting is made. This is accomplished with the ratchet arm 9, which lifts the contact supports 8 so that the contacts are removed by the strength of their own springs. This arrangement thus avoids contact wear due to sliding friction.
  • a radio apparatus employing coils for tuning, comprising carrier means carrying a plurality of coils, adjusting means for moving said carrier means into different positions to render a desired one of said coils effective, said adjusting means comprising a drive mechanism for rotating said carrier means, and eccentrically mounted rotary control means operative to render said rotary movement slow upon initiation of rotation, more rapid during an intermediate portion of its rotation and slow again upon its approach to said adjusted position.
  • said last named means comprises an elliptical gear train to effect a gear ratio variation from step-up to step-down and back again to step-up by one control operation.
  • radio apparatus employing coils for tuning and contacts for connecting such coils to external circuits, mechanical means for adjusting said tuning coils with a variable transmission ratio varying from low ratio, to higher ratio, to lower ratio for each adjustment, insulated spring contact supports controlled by said mechanical adjusting means and means for raising said contacts during said adjustment.
  • said last named means comprises ratchet means operatively associated With the said coils to effect the said control.

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  • Transmitters (AREA)
  • Structure Of Receivers (AREA)
US287193A 1938-08-03 1939-07-29 Drive for electric tuning means Expired - Lifetime US2297389A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE212946X 1938-08-03

Publications (1)

Publication Number Publication Date
US2297389A true US2297389A (en) 1942-09-29

Family

ID=5810740

Family Applications (1)

Application Number Title Priority Date Filing Date
US287193A Expired - Lifetime US2297389A (en) 1938-08-03 1939-07-29 Drive for electric tuning means

Country Status (4)

Country Link
US (1) US2297389A (en))
BE (1) BE435740A (en))
CH (1) CH212946A (en))
FR (1) FR858527A (en))

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470426A (en) * 1942-10-28 1949-05-17 Zenith Radio Corp Spread band tuning circuit
US2542732A (en) * 1940-01-26 1951-02-20 Radio Electr Soc Fr Device for conversion of frequencies
US2567860A (en) * 1946-11-18 1951-09-11 Arthur A Glass Tuning mechanism for superheterodyne radio receivers of the steptuned type
US2773988A (en) * 1952-11-26 1956-12-11 Standard Coil Prod Co Inc Frequency selector
US2973412A (en) * 1957-02-28 1961-02-28 Breeze Corp Limit control mechanism
US2989259A (en) * 1955-02-01 1961-06-20 Casco Products Corp Automatically operated radio antenna
US4042087A (en) * 1975-11-03 1977-08-16 Artur Markovich Itin Clutch control device for a machine tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE933346C (de) * 1950-10-21 1955-09-22 Siemens Ag Variometer mit beweglichem Eisenkern, insbesondere zur Kurzwellenbandspreizung in Rundfunkgeraeten

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542732A (en) * 1940-01-26 1951-02-20 Radio Electr Soc Fr Device for conversion of frequencies
US2470426A (en) * 1942-10-28 1949-05-17 Zenith Radio Corp Spread band tuning circuit
US2567860A (en) * 1946-11-18 1951-09-11 Arthur A Glass Tuning mechanism for superheterodyne radio receivers of the steptuned type
US2773988A (en) * 1952-11-26 1956-12-11 Standard Coil Prod Co Inc Frequency selector
US2989259A (en) * 1955-02-01 1961-06-20 Casco Products Corp Automatically operated radio antenna
US2973412A (en) * 1957-02-28 1961-02-28 Breeze Corp Limit control mechanism
US4042087A (en) * 1975-11-03 1977-08-16 Artur Markovich Itin Clutch control device for a machine tool

Also Published As

Publication number Publication date
BE435740A (en))
FR858527A (fr) 1940-11-27
CH212946A (de) 1940-12-31

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