US3818767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passive dual-spin misalignment compensators
Assignee: National Aeronautics and Space Administration
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Filing: 1972-09-29
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Granted: 1974-06-25
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Expires: 1992-09-29
Abstract
Abstract In combination with a ''''dual-spin'''' gyroscopically stabilized device having a spinning rotor and a non-spinning platform two substantially lossless mechanical resonators, resonant at the spin frequency, are orthogonally disposed on the platform for compensation for the disturbing torque acting on the platform due to rotor misalignment.
Inventors
- 👤 J Donohue
- 👤 B Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:48
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; B; B64; B64G; B64G1/00; B64G1/22; B64G1/24; B64G1/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
In combination with a ''''dual-spin'''' gyroscopically stabilized device having a rotor spinning about a spin axis at an essentially constant spin rate which is rotatably coupled to a non-spinning platform, said dual spin device having nutation damping means, the improvement comprising: A first mechanical resonator, resonant at a predetermined frequency equal to the spin rate, disposed on the platform so as to apply torque to said platform in a direction perpendicular to the spin axis; and A second mechanical resonator, resonant at said predetermined frequency and disposed on the platform so as to apply torque to said platform in a direction perpendicular both to the spin axis and to the direction of torque application of the first resonator.
Claim 2
Dependent Claim
118 words
In combination with a ''''dual-spin'''' gyroscopically stabilized device having a rotor spinning about a spin axis at an essentially constant spin rate which is rotatably coupled to a non-spinning platform, said dual spin device having nutation damping means, the improvement comprising: A first mechanical resonator, resonant at a predetermined frequency equal to the spin rate, disposed on the platform so as to apply torque to said platform in a direction perpendicular to the spin axis; and A second mechanical resonator, resonant at said predetermined frequency and disposed on the platform so as to apply torque to said platform in a direction perpendicular both to the spin axis and to the direction of torque application of the first resonator.
Claim 3
Dependent Claim
14 words
The improvement of claim 1 where each of the mechanical resonators are substantially lossless.
Claim 4
Dependent Claim
47 words
The improvement of claim 1 wherein each of the mechanical resonators are torsional resonators comprising: A mass which is rotable with respect to the platform; and spring means for applying torque to the platform proportional to the angle of rotation of the mass relative to the platform.
Claim 5
Dependent Claim
18 words
The improvement of claim 3 where the spring means comprises a wire coupling the mass to the platform.
Claim 6
Dependent Claim
16 words
The improvement of claim 3 where the spring means comprises two springs which are in series.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |