US3825864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerial tuning device
Assignee: Karlskronavarvet AB
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Filing: 1973-06-25
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Granted: 1974-07-23
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Expires: 1993-06-25
Abstract
Abstract An aerial tuning device comprising a coil and a capacitor having variable inductance and capacitance, respectively, said coil being connected in series with the aerial and also connected to the capacitor. The coil is provided with a movable contact, and the capacitor has a continuously rotating adjustment shaft, said shaft being operatively linked with said movable contact, so that the shaft is rotated at the same time as the contact of the coil is moved. Thus, during the movement of the coil contact, the capacitance of the capacitor varies up and down between a minimum value and a maximum value.
Inventors
- 👤 S Ramstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:01
CPC Classifications
H; H03; H03J; H03J5/00; H03H; H03H7/00; H03H7/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
227 words
An aerial tuning device comprising a coil having a variable inductance and being connected in series with the aerial and a capacitor having variable capacitance and being connected to the coil, the coil and the capacitor together forming a tuning circuit for the aerial, said coil being provided with a contact which is movable along the winding turns of the coil for variation of the inductance of the coil, said capacitor having a capacitance setting shaft which is continuously rotatable in either direction for variation of the capacitance up and down repeatedly, said shaft being coupled with the movable contact of the coil in such a way that the capacitance swings repeatedly between a minimum value and a maximum value during the moving of the coil contact in one direction, said coil being provided with a rotary arm which at its one end is supported on a shaft concentric with the coil and at its other end carries said movable contact which is moved on the winding turns of the coil during the rotation of the arm about the shaft, said coil shaft and said capacitance setting shaft being provided with one drive wheel each, said drive wheels being mutually engaged and adapted to be rotated in a predetermined ratio, one of said drive wheels engaging a drive wheel which is mounted on a rotary drive shaft.
Claim 2
Dependent Claim
227 words
An aerial tuning device comprising a coil having a variable inductance and being connected in series with the aerial and a capacitor having variable capacitance and being connected to the coil, the coil and the capacitor together forming a tuning circuit for the aerial, said coil being provided with a contact which is movable along the winding turns of the coil for variation of the inductance of the coil, said capacitor having a capacitance setting shaft which is continuously rotatable in either direction for variation of the capacitance up and down repeatedly, said shaft being coupled with the movable contact of the coil in such a way that the capacitance swings repeatedly between a minimum value and a maximum value during the moving of the coil contact in one direction, said coil being provided with a rotary arm which at its one end is supported on a shaft concentric with the coil and at its other end carries said movable contact which is moved on the winding turns of the coil during the rotation of the arm about the shaft, said coil shaft and said capacitance setting shaft being provided with one drive wheel each, said drive wheels being mutually engaged and adapted to be rotated in a predetermined ratio, one of said drive wheels engaging a drive wheel which is mounted on a rotary drive shaft.
Claim 3
Dependent Claim
171 words
An aerial tuning device, comprising a coil having variable inductance and being connected in series with the aerial and a capacitor having variable capacitance and being connected to the coil, the coil and the capacitor together forming a tuning circuit for the aerial, said coil being provided with a contact, which is movable along the winding turns of the coil for variation of the inductance of the coil, and said capacitor having a capacitance setting shaft which is continuously rotatable in eiTher direction for variation of the capacitance up and down repeatedly, said shaft being coupled with the movable contact of the coil in such a way that the capacitance of the capacitor varies up and down repeatedly between a minimum value and a maximum value during the moving of the coil contact in one direction, wherein the capacitor comprises a variable portion and at least one fixed portion connected in parallel with said variable portion, said capacitor being adapted to be connected between either end of the coil and earth.
Claim 4
Dependent Claim
171 words
An aerial tuning device, comprising a coil having variable inductance and being connected in series with the aerial and a capacitor having variable capacitance and being connected to the coil, the coil and the capacitor together forming a tuning circuit for the aerial, said coil being provided with a contact, which is movable along the winding turns of the coil for variation of the inductance of the coil, and said capacitor having a capacitance setting shaft which is continuously rotatable in eiTher direction for variation of the capacitance up and down repeatedly, said shaft being coupled with the movable contact of the coil in such a way that the capacitance of the capacitor varies up and down repeatedly between a minimum value and a maximum value during the moving of the coil contact in one direction, wherein the capacitor comprises a variable portion and at least one fixed portion connected in parallel with said variable portion, said capacitor being adapted to be connected between either end of the coil and earth.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |