US4258577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gyroscopic apparatus
Assignee: BTG International Ltd
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Filing: 1979-02-23
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Granted: 1981-03-31
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Expires: 1999-02-23
Abstract
Abstract A gyroscope in which sprung elements are supported in cantilever fashion from a rotor and extend in a generally inward direction towards the rotor axis. The centers of mass of the elements are out of alignment with the rotor axis and the elements are free to vibrate in directions parallel to that axis. The output of the gyroscope is derived from detection of these vibrations.
Inventors
- 👤 Colin H. J. Fox
- 👤 James S. Burdess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:37
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/56; G01C19/5642; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1261; Y10T74/1275
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
Gyroscopic apparatus including: a drive member, adapted to rotate about a drive axis; a sensitive element attached to said drive member, said sensitive element comprising a sprung mass system including spring members and having its centre of mass offset from said drive axis, said spring members extending away from the points of said attachment of said sprung mass system to said drive member in directions having a radially-inwards component relative to said drive axis and being free to permit vibration of said element in a direction parallel to said drive axis, and means to detect said vibration and convert it to gyroscopically-useful signals.
Claim 2
Dependent Claim
103 words
Gyroscopic apparatus including: a drive member, adapted to rotate about a drive axis; a sensitive element attached to said drive member, said sensitive element comprising a sprung mass system including spring members and having its centre of mass offset from said drive axis, said spring members extending away from the points of said attachment of said sprung mass system to said drive member in directions having a radially-inwards component relative to said drive axis and being free to permit vibration of said element in a direction parallel to said drive axis, and means to detect said vibration and convert it to gyroscopically-useful signals.
Claim 3
Dependent Claim
38 words
Gyroscopic apparatus according to claim 1 in which said spring members are supported as cantilevers from said drive member, and in which the fixed and free ends of said cantilevers lie to opposite sides of said drive axis.
Claim 4
Dependent Claim
39 words
Gyroscopic apparatus according to claim 1 in which said spring members are supported as cantilevers from said drive member, and in which the fixed and free ends of said cantilevers lie to the same side of said drive axis.
Claim 5
Dependent Claim
22 words
Gyroscopic apparatus according to claim 1 in which said mass of said sprung mass system is that of said spring members themselves.
Claim 6
Dependent Claim
14 words
Gyroscopic apparatus according to claim 1 in which said spring members carry added masses.
Claim 7
Dependent Claim
32 words
Gyroscopic apparatus according to claim 5 in which said spring members are light so that substantially the whole of said mass of said sprung mass system is due to said added masses.
Claim 8
Dependent Claim
40 words
Gyroscopic apparatus according to claim 1 in which said drive member is balanced by carrying masses at points which, relative to said drive axis, lie diametrically opposite to points of said attachment of said sensitive element to said drive member.
Claim 9
Dependent Claim
40 words
Gyroscopic apparatus according to claim 1 in which said sensitive element mass system is attached to said drive member at a plurality of peripheral points, so that said centre of mass of said sprung mass system lies within said periphery.
Claim 10
Dependent Claim
33 words
Gyroscopic apparatus according to claim 1 in which said sensitive element comprises a mass connected to said drive member by said spring members extending in opposite radial directions relative to said drive axis.
References Cited (Backward Citations)
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US3463016A
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US3318160A
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US3382726A
Cited
US3394597A
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US3559492A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |