US3689724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel selection apparatus for high frequency receivers with variable capacitance diode tuning
Assignee: Individual
•
Filing: 1970-01-27
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Granted: 1972-09-05
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Expires: 1990-01-27
Abstract
Abstract A channel selection apparatus in the general form of a box having a swingable access door. The door is biased to remain open when opened and to remain closed when closed. The access door carries a plurality of manually depressible keys in the form of levers. Upon depression each lever engages and activates an electrical switch carried within the box.
Inventors
- 👤 Wolfgang Labude
- 👤 Karl-Heinz Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:31
CPC Classifications
H; H01; H01H; H01H21/00; H01H21/02; H01H21/18; H01H21/22; H01H21/025; H03; H03J; H03J1/00; H03J1/06; H03J1/066
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
123 words
A channel selection apparatus for high frequency receivers of the type provided with variable capacitance diode tuning and adjustable voltage dividers for impressing variable voltages on the diodes, the improvement comprising, a. a plurality of manually depressible, reciprocating switches mounted on the apparatus, said switches being adapted to change impressed voltage on tuning diodes, b. a swingable door in the form of a covering panel pivotally supported at one end thereof on the apparatus and having an open and closed position relative to the apparatus, c. a plurality of manually depressible keys supported on said swingable door and having portions contiguous to and engageable with said switches, d. said manually depressible keys being levers, said levers being pivotally supported in said swingable door.
Claim 2
Dependent Claim
123 words
A channel selection apparatus for high frequency receivers of the type provided with variable capacitance diode tuning and adjustable voltage dividers for impressing variable voltages on the diodes, the improvement comprising, a. a plurality of manually depressible, reciprocating switches mounted on the apparatus, said switches being adapted to change impressed voltage on tuning diodes, b. a swingable door in the form of a covering panel pivotally supported at one end thereof on the apparatus and having an open and closed position relative to the apparatus, c. a plurality of manually depressible keys supported on said swingable door and having portions contiguous to and engageable with said switches, d. said manually depressible keys being levers, said levers being pivotally supported in said swingable door.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1 wherein the point of engagement of said levers with said switches is between their pivotal support and their other ends.
Claim 4
Dependent Claim
19 words
The apparatus of claim 2 wherein said point of engagement is approximately midway of the length of the levers.
Claim 5
Dependent Claim
36 words
The apparatus of claim 1 including, a. spring means for biasing said swingable door closed, in the closed position of said door, and for biasing said swingable door open, in the open position of said door.
Claim 6
Dependent Claim
25 words
The apparatus of claim 1 wherein said lever keys are arranged so that adjacent lever keys are pivotal on opposite sides of said swingable door.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 including indicating means for identifying a key which has been actuated.
Claim 8
Dependent Claim
41 words
The apparaTus of claim 6 wherein said indicating means is defined by a fluorescent pintle positioned below each lever and passing through an aperture in each lever only when said lever is depressed, to thereby expose the end of the pintle.
Claim 9
Dependent Claim
26 words
The apparatus of claim 6 wherein said indicating means is defined by a lamp mounted contiguous to each lever and energized upon actuation of the lever.
Claim 10
Dependent Claim
52 words
The apparatus of claim 4 wherein said spring means is defined by a tongue spring for each said lever key and affixed to the apparatus and having a portion of the spring in bearing engagement with its corresponding lever key, whereby both the individual lever keys and the swingable door are biased.
Claim 11
Dependent Claim
137 words
A channel selection apparatus for high frequency receivers of the type provided with variable capacitance diode tuning and adjustable voltage dividers for impressing variable voltages on the diodes, the improvement comprising, a. a plurality of manually depressible, reciprocating switches mounted on the apparatus, said switches being adapted to change impressed voltage on tuning diodes, b. a swingable door in the form of a covering panel pivotally supported at one end thereof on the apparatus and having an open and closed position relative to the apparatus, c. a plurality of manually depressible keys supported on said swingable door and having portions contiguous to and engageable with said switches, d. spring means for biasing said swingable door closed, in the closed position of said door, and for biasing said swingable door open, in the open position of said door.
Claim 12
Dependent Claim
137 words
A channel selection apparatus for high frequency receivers of the type provided with variable capacitance diode tuning and adjustable voltage dividers for impressing variable voltages on the diodes, the improvement comprising, a. a plurality of manually depressible, reciprocating switches mounted on the apparatus, said switches being adapted to change impressed voltage on tuning diodes, b. a swingable door in the form of a covering panel pivotally supported at one end thereof on the apparatus and having an open and closed position relative to the apparatus, c. a plurality of manually depressible keys supported on said swingable door and having portions contiguous to and engageable with said switches, d. spring means for biasing said swingable door closed, in the closed position of said door, and for biasing said swingable door open, in the open position of said door.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |