Patent DE488738C successfully refreshed from Google Patents.
US3762062A
Expired / Lapsed
US
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Twin gyro north seeker
Assignee: Individual
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Filing: 1971-07-20
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Granted: 1973-10-02
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Expires: 1991-07-20
Abstract
Abstract A north-seeking system having a pair of integrating gyroscopes with input and output axes in respectively parallel and normal relation to a horizontal plate and corresponding pickoffs at equal oblique angles with a selected plate diameter. Respective pickoff amplifiers are connected to a summer for statistically average operation of a servo motor to rotate the selected diameter for universal terrestrial orientation of the selected diameter to the North-South meridian.
Inventors
- 👤 J Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:55
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; G01C19/38; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1221
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A north-seeking system for terrestrial operation comprising: a. a base; b. a support member mounted thereon for rotation about an axis of said base, with said base having means for adjusting it to verticalize said axis; c. a servo motor mounted on the base for rotating said support member about said axis; d. a gyrosopic assembly including a pair of gyroscopes each having an input axis and an output axis and a precession pickoff and secured to said support member with said input and output axes in normal and codirectional relation respectively with said first -named axis, and with said pickoffs so positioned that at a null condition of both, the spin axes of the respective gyroscopes are at a substantial azimuthal angle to each other; e. a differential summer connected to said pickoffs and to said servo motor to rotate said support member to an azimuth position at which the summer output is at a null; and f. an indicator fixed to said support member and directed along the bisector of said azimuthal angle for meridian indication.
Claim 2
Dependent Claim
178 words
A north-seeking system for terrestrial operation comprising: a. a base; b. a support member mounted thereon for rotation about an axis of said base, with said base having means for adjusting it to verticalize said axis; c. a servo motor mounted on the base for rotating said support member about said axis; d. a gyrosopic assembly including a pair of gyroscopes each having an input axis and an output axis and a precession pickoff and secured to said support member with said input and output axes in normal and codirectional relation respectively with said first -named axis, and with said pickoffs so positioned that at a null condition of both, the spin axes of the respective gyroscopes are at a substantial azimuthal angle to each other; e. a differential summer connected to said pickoffs and to said servo motor to rotate said support member to an azimuth position at which the summer output is at a null; and f. an indicator fixed to said support member and directed along the bisector of said azimuthal angle for meridian indication.
Claim 3
Dependent Claim
21 words
A north-seeking system as in claim 1 including amplifiers and demodulators serially connected between said precession pickoffs and said differential summer.
Claim 4
Dependent Claim
35 words
A north-seeking system as in claim 2 for operation with extraneous torques applied around said East-West axis, said gyroscopes being provided with oppositely wound rotor windings to provide stability to said indicator at the meridian.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |