US3771079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning device effecting simultaneous variation of inductance and capacitance
Assignee: Nissan Denshi Co Ltd
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Filing: 1972-02-25
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Granted: 1973-11-06
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Expires: 1992-02-25
Abstract
Abstract A tuning device for radio receivers including an inductor having a movable core and a variable condenser coupled one to the other for simultaneous operation to tune the receiver.
Inventors
- 👤 K Kawasaki
- 👤 K Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:31
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/06; H03J1/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
A tuning device for radio receivers comprising an inductor having a movable magnetic core assembly, a variable condenser and means coupling said movable core and variable condenser to effect simultaneous operation thereof for tuning said receiver, said variable condenser including a rotatable shaft and said magnetic core assembly including a cam rotatably carried by a shaft directly coupled with the first said shaft, and means engaging said cam and core to displace the latter axially as the cam is rotated, said coupling means including a pair of meshed spur gears with one gear being carried by said condenser shaft and the other gear being carried by said cam shaft.
Claim 2
Dependent Claim
109 words
A tuning device for radio receivers comprising an inductor having a movable magnetic core assembly, a variable condenser and means coupling said movable core and variable condenser to effect simultaneous operation thereof for tuning said receiver, said variable condenser including a rotatable shaft and said magnetic core assembly including a cam rotatably carried by a shaft directly coupled with the first said shaft, and means engaging said cam and core to displace the latter axially as the cam is rotated, said coupling means including a pair of meshed spur gears with one gear being carried by said condenser shaft and the other gear being carried by said cam shaft.
Claim 3
Dependent Claim
67 words
A tuning device according to claim 1 wherein said cam is in the shape of a disc concentrically carried by said cam shaft with one side of said disc having an inclined annular surface and said engaging means includes a shaft connected at one end to said core, and spring means urging the other end of the last said shaft against said one side of said cam.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |