Patent US3665217A successfully refreshed from Google Patents.
US3665217A
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US
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Flight control disabling system
Assignee: RTX Corp
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Filing: 1969-12-29
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Granted: 1972-05-23
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Expires: 1989-12-29
Abstract
Abstract A flight control disabling system operates by measuring the amplitude and frequency of control signals in the various flight control channels of the system. If in any channel there develops an oscillatory control signal exceeding a certain amplitude and lying within a predetermined frequency band, then either that channel alone or the entire flight control system is disabled.
Inventors
- 👤 Don L Adams
- 👤 Nicholas Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:00
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; B; B64; B64C; B64C17/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
64 words
A disabling circuit for a control system providing a control signal including in combination amplitude discriminating means responsive to said control signal for detecting signals exceeding a predetermined magnitude, frequency discriminating means responsive to the detecting means for sensing detected signals exceeding a certain frequency, and means responsive to the sensing means for disabling that portion of said control system providing said control signal.
Claim 2
Dependent Claim
64 words
A disabling circuit for a control system providing a control signal including in combination amplitude discriminating means responsive to said control signal for detecting signals exceeding a predetermined magnitude, frequency discriminating means responsive to the detecting means for sensing detected signals exceeding a certain frequency, and means responsive to the sensing means for disabling that portion of said control system providing said control signal.
Claim 3
Dependent Claim
22 words
A disabling circuit as in claim 1 wherein the disabling means comprises means for disabling a further portion of said control system.
Claim 4
Dependent Claim
23 words
A disabling circuit as in claim 1 wherein the sensing means comprises a counting device and means for periodically clearing the counting device.
Claim 5
Dependent Claim
17 words
A disabling circuit as in claim 1 wherein the sensing means comprises a plurality of mono-stable multivibrators.
Claim 6
Dependent Claim
37 words
A disabling circuit as in claim 1 in which said control system provides a reversible polarity control signal wherein the amplitude discriminating means comprises means for detecting both positive and negative polarity signals exceeding said predetermined magnitude.
Claim 7
Dependent Claim
32 words
A disabling circuit as in claim 1 in which said control system provides an oscillatory control signal wherein the sensing means comprises means for counting a predetermined number of half-cycles of oscillation.
Claim 8
Dependent Claim
31 words
A disabling circuit as in claim 6 wherein the construction of the sensing means is such that said predetermined number of half-cycles is at least one but not more than four.
Claim 9
Dependent Claim
34 words
A disabling circuit as in claim 1 which further includes a low-pass filter which attenuates signals exceeding a predetermined frequency and means including said filter for coupling the control signal to the detecting means.
Claim 10
Dependent Claim
35 words
A disabling circuit as in claim 1 which further includes a high-pass filter which attenuates signals less than said certain frequency and means including the filter for coupling said control signal to the detecting means.
Claim 11
Dependent Claim
27 words
A disabling circuit as in claim 1 which further includes a band-pass filter and means including said filter for coupling the control signal to the detecting means.
Claim 12
Dependent Claim
76 words
A disabling circuit for a control system providing a plurality of independent control signals including in combination amplitude discriminating means, frequency discriminating means, means responsive to only one of said control signals and comprising both discriminating means for detecting oscillations of said one control signal exceeding a predetermined amplitude and lying within a predetermined frequency band, and means responsive to the detecting means for disabling that portion of said control system providing said one control signal.
Claim 13
Dependent Claim
76 words
A disabling circuit for a control system providing a plurality of independent control signals including in combination amplitude discriminating means, frequency discriminating means, means responsive to only one of said control signals and comprising both discriminating means for detecting oscillations of said one control signal exceeding a predetermined amplitude and lying within a predetermined frequency band, and means responsive to the detecting means for disabling that portion of said control system providing said one control signal.
Claim 14
Dependent Claim
65 words
In a control system providing a plurality of independent control signals, means responsive to only one of said control signals for detecting oscillations of said one control signal lying within a predetermined frequency band and exceeding a predetermined amplitude, means for disabling that portion of said control system providing said one control signal, and means responsive to the detecting means for actuating the disabling means.
Claim 15
Dependent Claim
65 words
In a control system providing a plurality of independent control signals, means responsive to only one of said control signals for detecting oscillations of said one control signal lying within a predetermined frequency band and exceeding a predetermined amplitude, means for disabling that portion of said control system providing said one control signal, and means responsive to the detecting means for actuating the disabling means.
Claim 16
Dependent Claim
116 words
In a control system providing independent first and second control signals, first means responsive to only the first of said control signals for detecting oscillations of the first control signal lying within a predetermined frequency band and exceeding a predetermined amplitude, second means responsive to only the second of said control signals for detecting oscillations of the second control signal lying within a certain frequency band and exceeding a certain amplitude, means responsive to the first detecting means for disabling at least that portion of said control system providing the first control signal, and means responsive to the second detecting means for disabling at least that portion of said control system providing the second control signal.
Claim 17
Dependent Claim
116 words
In a control system providing independent first and second control signals, first means responsive to only the first of said control signals for detecting oscillations of the first control signal lying within a predetermined frequency band and exceeding a predetermined amplitude, second means responsive to only the second of said control signals for detecting oscillations of the second control signal lying within a certain frequency band and exceeding a certain amplitude, means responsive to the first detecting means for disabling at least that portion of said control system providing the first control signal, and means responsive to the second detecting means for disabling at least that portion of said control system providing the second control signal.
Claim 18
Dependent Claim
82 words
A disabling circuit for a control system providing a control signal including in combination means responsive to the control signal for providing an output pulse upon each occasion that the control signal exceeds a predetermined magnitude, means responsive to the pulse means and operable upon the occurrence of at least two output pulses within a predetermined time interval for providing an output signal, and means responsive to the output signal for disabling that portion of the control system providing the control signal.
Claim 19
Dependent Claim
82 words
A disabling circuit for a control system providing a control signal including in combination means responsive to the control signal for providing an output pulse upon each occasion that the control signal exceeds a predetermined magnitude, means responsive to the pulse means and operable upon the occurrence of at least two output pulses within a predetermined time interval for providing an output signal, and means responsive to the output signal for disabling that portion of the control system providing the control signal.
Claim 20
Dependent Claim
40 words
A disabling circuit as in claim 14 in which said control signal is of reversible polarity and in which the pulse means comprises means providing an output pulse for both positive and negative polarity control signals exceeding said predetermined magnitude.
Claim 21
Dependent Claim
27 words
A disabling circuit as in claim 14 which further includes a band-pass filter and means including the filter for coupling the control signal to the pulse means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |