US3802276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constrained gyro for strapdown application
Assignee: United States Department of the Army
•
Filing: 1972-09-25
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Granted: 1974-04-09
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Expires: 1992-09-25
Abstract
Abstract A structure wherein any output movement of the gyro float is constrained by a group of quartz crystal resonators. Any potential movement of the float causes a change in the frequency of vibration of the crystals thus giving digital information without any torque rebalance circuitry.
Inventors
- 👤 J Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:44
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/30; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1261; Y10T74/1275
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A gyro device comprising, a housing, a strapped down gyro in said housing, said gyro having an output shaft, a bar fixed to said output shaft extending transverse thereto, a plurality of crystal resonators fastened between the outer ends of said bar and said housing, means for applying tension to said resonators, circuit means connecting said resonators in a bridge structure, a constant frequency power means connected to the input of said bridge circuit, whereby any potential rotation of said bar will cause a change in the output frequency of said bridge circuit.
Claim 2
Dependent Claim
93 words
A gyro device comprising, a housing, a strapped down gyro in said housing, said gyro having an output shaft, a bar fixed to said output shaft extending transverse thereto, a plurality of crystal resonators fastened between the outer ends of said bar and said housing, means for applying tension to said resonators, circuit means connecting said resonators in a bridge structure, a constant frequency power means connected to the input of said bridge circuit, whereby any potential rotation of said bar will cause a change in the output frequency of said bridge circuit.
Claim 3
Dependent Claim
31 words
A strapped down gyro as set forth in claim 1 wherein, the means for applying tension to said resonators is such that the tension of each resonator can be varied individually.
Claim 4
Dependent Claim
26 words
A strapped down gyro as set forth in claim 2 wherein, the crystal resonators are quartz crystals gold plated to form closed double ended tuning forks.
References Cited (Backward Citations)
US2479122A
Cited
US2567682A
Cited
US2703935A
Cited
US2746301A
Cited
US2964952A
Cited
US3147627A
Cited
US3267746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |