US3569926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flight path and speed command display
Assignee: Singer General Precision Inc
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Filing: 1969-03-19
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Granted: 1971-03-09
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Expires: 1989-03-19
Abstract
Abstract An electro-optical aircraft flight instrument that accepts input signals representing angle of attack and pitch angle and used these signals to drive servo reticles which, together with a fixed reticle, are projected at infinity upon a transparent screen in the pilot''s normal line of sight. The servoed reticles display flight path of the aircraft and the angle, in degrees, between that flight path and the horizon, while the fixed reticle shows the extension of the aircraft longitudinal axis, or datum line, and a speed control which, together with the projected flight path reticle, displays to the pilot the proper landing approach speed, and warns him of a stall approach speed.
Inventors
- 👤 Richard A Korn
- 👤 Milo E Stormo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:02
CPC Classifications
G; G01; G01C; G01C23/00; G01C23/005; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0676
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A display instrument for projecting aircraft data into the pilot''s normal line of sight, said instrument comprising: a transparent combining glass positioned in the line of sight of the pilot and having a surface for reflecting projected images into the pilot''s line of sight; a housing fixed with respect to the aircraft; a first movable member mounted in said housing and including a first reticle; first servo means responsive to the output signals from an angle of attack sensor and a pitch angle sensor for moving said first movable member in accordance with glide slope angle of the aircraft; a second movable member mounted in said housing and including a second reticle; second means responsive to output signals from an angle of attack sensor for moving said second movable member in accordance with the angle of attack of the aircraft; a third member mounted in said housing and fixed with respect to said housing, said third member including a speed control reticle; and optical means for projecting images of said first, second and third reticles, in unison and focused at infinity, onto the surface of said combining glass.
Claim 2
Dependent Claim
188 words
A display instrument for projecting aircraft data into the pilot''s normal line of sight, said instrument comprising: a transparent combining glass positioned in the line of sight of the pilot and having a surface for reflecting projected images into the pilot''s line of sight; a housing fixed with respect to the aircraft; a first movable member mounted in said housing and including a first reticle; first servo means responsive to the output signals from an angle of attack sensor and a pitch angle sensor for moving said first movable member in accordance with glide slope angle of the aircraft; a second movable member mounted in said housing and including a second reticle; second means responsive to output signals from an angle of attack sensor for moving said second movable member in accordance with the angle of attack of the aircraft; a third member mounted in said housing and fixed with respect to said housing, said third member including a speed control reticle; and optical means for projecting images of said first, second and third reticles, in unison and focused at infinity, onto the surface of said combining glass.
Claim 3
Dependent Claim
21 words
The instrument claimed in claim 1, wherein said first reticle comprises a transparent scale calibrated in degrees of flight path angle.
Claim 4
Dependent Claim
44 words
The instrument claim in claim 1, wherein said optical means includes a collimating lens in the optical path between said reticles and said combining glass, said first, second and third reticles being positioned substantially in the plane of principal focus of said collimating lens.
Claim 5
Dependent Claim
21 words
The instrument claimed in claim 1, wherein said third member includes a transparent reticle representing the datum line of the aircraft.
Claim 6
Dependent Claim
53 words
The instrument claimed in claim 1, wherein said first, second and third reticles are transparent reticles, and said first, second and third members are first, second and third opaque tapes, respectively, that are movable with respect to each other, and which includes a light source in said housing for back lighting said reticles.
Claim 7
Dependent Claim
46 words
The instrument claimed in claim 4, wherein said third member includes a further transparent reticle representing the stall speed of said aircraft, said stall reticle being spaced from said datum reticle by an amount representing the angle of attack at which the particular aircraft will stall.
References Cited (Backward Citations)
US3005185A
Cited
US3190585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |