US3885431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balance type angle of attack indicator
Assignee: Individual
•
Filing: 1973-08-28
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Granted: 1975-05-27
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Expires: 1993-08-28
Abstract
Abstract An angle of attack indictor for use as a cock pit instrument including movable elements which respond to the differences in pressure at selected points on the aircraft. The pressure points include total pressure sensed by the aircraft pitot tube (po), atmospheric pressure sensed at aircraft static pressure port (p ), and pressure sensed from at least one port on wing surface (p). The difference of one pair of pressures is divided by the difference of a second pair of pressures to obtain the pressure coefficient which is a direct indication of the angle-of-attack of the aircraft.
Inventors
- 👤 Roger W Gallington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:14
CPC Classifications
B; B64; B64D; B64D43/00; B64D43/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
287 words
A balance type angle of attack indicator for use in an aircraft cockpit instrument comprising means for sensing the pressure in at least three selected positions on the aircraft, one of the selected positions at which the pressure is sensed being the pitot tube of the aircraft, another of the selected positions being the atmospheric pressure at the aircraft static pressure port, and still another of the selected positions being located on the wing of the aircraft, tubing means for transmitting the pressures to a central area, and means for mechanically dividing the difference between one pair of pressures by the difference between a second pair of pressures including an enclosure having three operatively connected sections, the first of said sections being formed in the lower left side portion of the enclosure by the inner surface of a first bellows with a link arm extending angularly upward therefrom, the second of said sections being formed in the lower right side portion of the enClosure by the inner surface of a second bellows with a link arm extending angularly upward therefrom, the third of said sections being formed in the central portion of the enclosure between the first and second sections in operative communication with the outer surface of said first and second bellows, pressure from a different selected position on the aircraft being transmitted to each of the sections in said enclosure, each of said first and second bellows expanding linearly in response to differences in pressure at the selected positions on the aircraft and linkage means connected to said bellows link arms for translating the linear movement of said bellows into rotational movement to give an accurate indication of the angle of attack of the aircraft.
Claim 2
Dependent Claim
287 words
A balance type angle of attack indicator for use in an aircraft cockpit instrument comprising means for sensing the pressure in at least three selected positions on the aircraft, one of the selected positions at which the pressure is sensed being the pitot tube of the aircraft, another of the selected positions being the atmospheric pressure at the aircraft static pressure port, and still another of the selected positions being located on the wing of the aircraft, tubing means for transmitting the pressures to a central area, and means for mechanically dividing the difference between one pair of pressures by the difference between a second pair of pressures including an enclosure having three operatively connected sections, the first of said sections being formed in the lower left side portion of the enclosure by the inner surface of a first bellows with a link arm extending angularly upward therefrom, the second of said sections being formed in the lower right side portion of the enClosure by the inner surface of a second bellows with a link arm extending angularly upward therefrom, the third of said sections being formed in the central portion of the enclosure between the first and second sections in operative communication with the outer surface of said first and second bellows, pressure from a different selected position on the aircraft being transmitted to each of the sections in said enclosure, each of said first and second bellows expanding linearly in response to differences in pressure at the selected positions on the aircraft and linkage means connected to said bellows link arms for translating the linear movement of said bellows into rotational movement to give an accurate indication of the angle of attack of the aircraft.
Claim 3
Dependent Claim
71 words
The balance type angle of attack indicator defined in claim 1 wherein pressure from the aircraft static pressure port is transmitted to the first of the sections having the first bellows therein, pressure from a wing static pressure port being transmitted to the second section having the second bellows therein and pressure from the aircraft pitot tube being transmitted to the third of the three operatively connected sections in the enclosure.
References Cited (Backward Citations)
US2237306A
Cited
US3500685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |