US3790108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redundant stabilizer control
Assignee: McDonnell Douglas Corp
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Filing: 1972-11-13
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Granted: 1974-02-05
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Expires: 1992-11-13
Abstract
Abstract A redundant control system for operating two flight control surfaces such as a rotatable stabilizer and an elevator rotatably mounted thereon whereby in the event of either control surface mechanically jamming, the preselected control system may still be used to actuate the unjammed control surface.
Inventors
- 👤 J Bock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:35
CPC Classifications
B; B64; B64C; B64C13/00; Y; Y10; Y10T; Y10T74/00; Y10T74/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
A redundant stabilizer control system comprising: a stabilizer pivotally mounted to an aircraft, stabilizer actuator means for raising and lowering the leading edge of said stabilizer, first linkage means for actuating said stabilizer actuator means, said linkage means having an override device therein to disrupt forces through said linkage means from actuating said stabilizer when jamming of said stabilizer occurs, said stabilizer having a plurality of elevator sections attached thereto and adapted for relative movement therewith, elevator actuator means for moving said elevator sections relative to said stabilizer, second linkage means for actuating said elevator actuator means, said second linkage means having an override device therein to disrupt forces through said linkage means from actuating said elevators when jamming of said elevators occurs, and pilot control means for actuating both said linkage means.
Claim 2
Dependent Claim
133 words
A redundant stabilizer control system comprising: a stabilizer pivotally mounted to an aircraft, stabilizer actuator means for raising and lowering the leading edge of said stabilizer, first linkage means for actuating said stabilizer actuator means, said linkage means having an override device therein to disrupt forces through said linkage means from actuating said stabilizer when jamming of said stabilizer occurs, said stabilizer having a plurality of elevator sections attached thereto and adapted for relative movement therewith, elevator actuator means for moving said elevator sections relative to said stabilizer, second linkage means for actuating said elevator actuator means, said second linkage means having an override device therein to disrupt forces through said linkage means from actuating said elevators when jamming of said elevators occurs, and pilot control means for actuating both said linkage means.
Claim 3
Dependent Claim
32 words
A redundant stabilizer control system as in claim 1 wherein said pilot control means includes a torsion bar connected to said linkage means, and cable means operable to rotate said linkage means.
Claim 4
Dependent Claim
57 words
A redundant stabilizer control system as in claim 1 wherein said second linkage means includes separate linkages to each of said elevator sections and each of said linkages has an override device therein to disrupt actuating forces to their corresponding associated elevator sections when opposing forces caused by jamming and malfunctioning oppose and exceed said actuating forces.
Claim 5
Dependent Claim
50 words
A redundant stabilizer control system as in claim 1 wherein said stabilizer actuator means includes a pair of actuators, each of said actuators being controlled through separate linkages and each of said linkages has an override device therein for disrupting actuating forces through said linkages when jamming and malfunctioning occurs.
Claim 6
Dependent Claim
33 words
A redundant stabilizer control system as in claim 1 wherein said override devices include a resilient connection which receives without transmitting actuating forces when there are opposing forces due to jamming and malfunctioning.
Claim 7
Dependent Claim
105 words
A redundant stabilizer control system as in claim 5 wherein at least one of said override devices is connected to a rotational force input and a longitudinal movement pushrod linkage output, said one of said devices including a pair of legs pivotally mounted at one of their ends and connected at the other of their ends by spring means, said rotational input causing one of said legs to rotate, said spring means causing the other of said legs to rotate in the absence of opposing jamming and malfunctioning forces, said other of said legs being connected to said pushrod linkage to cause longitudinal movement thereof.
Claim 8
Dependent Claim
103 words
A redundant stabilizer control system as in claim 5 Wherein at least one of said override devices is connected to a pushrod linkage adapted for a longitudinal movement input, said one of said devices including a pair of legs pivotally mounted at one of their ends and connected at the other of their ends by spring means, said longitudinal movement input causing one of said legs to rotate, said spring means causing the other of said legs to rotate in the absence of opposing jamming and malfunctioning forces, and means operable by said other of said legs to actuate control surfaces associated therewith.
Claim 9
Dependent Claim
20 words
A redundant stabilizer control system as in claim 7 wherein said means is a torsion rod adapted for rotational movement.
Claim 10
Dependent Claim
25 words
A redundnt stabilizer control system as in claim 7 wherein said means is a pivotal crank for imparting longitudinal movement to a pushrod attached thereto.
References Cited (Backward Citations)
US2528752A
Cited
US3733039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |