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US4441375A
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US
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Gyroscopic instrument
Assignee: Furuno Electric Co Ltd
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Filing: 1981-01-14
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Granted: 1984-04-10
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Expires: 2001-01-14
Abstract
Abstract The present invention is directed to a gyroscopic instrument comprising concentric containers, the inner container enclosing a rotating electric gyro rotor, magnetic fluid enclosed between the inner and outer concentric containers, and magnetic flux producing means mounted on at least one of the two concentric containers, so that magnetic fluxes reach the magnetic fluid to support the inner container without contacting the outer container. The magnetic flux producing means are preferably mounted and oriented on a line drawn on at least one of the concentric containers at predetermined distances so that magnetic fluxes transmitted from the pole of one flux means reach the opposite pole of an adjacent means by passing through the magnetic fluid.
Inventors
- 👤 Kiyomi Minohara
- 👤 Atsushi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:14
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/16; G01C19/20; G01C19/24; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1229; Y10T74/1232; Y10T74/125
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
111 words
A gyroscopic instrument, comprising: a. a magnetic fluid, b. an outer container encompassing said magnetic fluid, c. an inner container enclosing at least one high speed rotating gyro rotor, being supplied with electric power from the outer container side and being positioned within said container, and d. magnetic flux producing means adjustably mounted on the outer container so that magnetic fluxes produced thereby reach said magnetic fluid to support said inner container free of contact with said outer container, said magnetic flux producing means comprising a pair of magnets which are oriented adjacent to one another with the north pole of one magnet facing the south pole of an adjacent magnet.
Claim 2
Dependent Claim
111 words
A gyroscopic instrument, comprising: a. a magnetic fluid, b. an outer container encompassing said magnetic fluid, c. an inner container enclosing at least one high speed rotating gyro rotor, being supplied with electric power from the outer container side and being positioned within said container, and d. magnetic flux producing means adjustably mounted on the outer container so that magnetic fluxes produced thereby reach said magnetic fluid to support said inner container free of contact with said outer container, said magnetic flux producing means comprising a pair of magnets which are oriented adjacent to one another with the north pole of one magnet facing the south pole of an adjacent magnet.
Claim 3
Dependent Claim
15 words
A gyroscopic instrument as defined in claim 1 wherein the containers are shaped as drums.
Claim 4
Dependent Claim
42 words
A gyroscopic instrument as defined in claim 1 wherein the specific gravity of the inner container is greater than the specific gravity of the magnetic fluid, and the magnetic flux producing means are mounted in the lower portion of the outer container.
Claim 5
Dependent Claim
42 words
A gyroscopic instrument as defined in claim 1 wherein the specific gravity of the inner container is less than the specific gravity of the magnetic fluid, and the magnetic flux producing means are mounted in the upper portions of the outer container.
Claim 6
Dependent Claim
34 words
A gyroscopic instrument as defined in claim 1 wherein the magnetic flux producing means are respectively mounted on the outer container at the angular points of a regular polygon inscribed within the outer container.
Claim 7
Dependent Claim
23 words
A gyroscopic instrument as defined in claims 1, 2, 3, 4 or 5 wherein the magnetic flux producing means is a permanent magnet.
Claim 8
Dependent Claim
22 words
A gyroscopic instrument as defined in claims 1, 2, 3, 4 or 5 wherein the magnetic flux producing means is an electro-magnet.
Claim 9
Dependent Claim
21 words
A gyroscopic instrument as defined in claims 1, 2, 3, 4 or 5 wherein parts of the outer container are magnetized.
Claim 10
Dependent Claim
14 words
A gyroscopic instrument as defined in claim 1 wherein the magnetic fluid is conductive.
Claim 11
Dependent Claim
122 words
A gyroscopic instrument, comprising: a. a magnetic fluid, b. an outer container emcompassing said magnetic fluid, c. an inner container enclosing at least one high speed rotating gyro rotor being supplied with electric power from the outer container side and being positioned within said container, and d. magnetic flux producing means adjustably mounted on the outer container on a line drawn on said outer container at a predetermined distance between the adjacent magnetic flux producing means so that magnetic fluxes transmitted from the north pole of a magnetic flux producing means reach the south pole of at least one adjacent magnetic flux producing means through said magnetic fluid, thereby supporting said inner container to float free of contact with said outer container.
Claim 12
Dependent Claim
122 words
A gyroscopic instrument, comprising: a. a magnetic fluid, b. an outer container emcompassing said magnetic fluid, c. an inner container enclosing at least one high speed rotating gyro rotor being supplied with electric power from the outer container side and being positioned within said container, and d. magnetic flux producing means adjustably mounted on the outer container on a line drawn on said outer container at a predetermined distance between the adjacent magnetic flux producing means so that magnetic fluxes transmitted from the north pole of a magnetic flux producing means reach the south pole of at least one adjacent magnetic flux producing means through said magnetic fluid, thereby supporting said inner container to float free of contact with said outer container.
Claim 13
Dependent Claim
15 words
A gyroscopic instrument as defined in claim 10 wherein the containers are shaped as drums.
Claim 14
Dependent Claim
49 words
A gyroscopic instrument as defined in claim 10 wherein the specific gravity of the inner container is greater than the specific gravity of the magnetic fluid, and the magnetic flux producing means are mounted on at least one horizontal line circumscribed on the lower portion of the outer container.
Claim 15
Dependent Claim
49 words
A gyroscopic instrument as defined in claim 10 wherein the specific gravity of the inner container is less than the specific gravity of the magnetic fluid, and the magnetic flux producing means are mounted on at least one horizontal line circumscribed on the upper portion of the outer container.
Claim 16
Dependent Claim
49 words
A gyroscopic instrument as defined in claim 10 wherein the magnetic flux producing means are mounted on at least one horizontal line circumscribed on the lower portion of the outer container and are mounted on at least one horizontal line circumscribed on the upper portion of the outer container.
Claim 17
Dependent Claim
50 words
A gyroscopic instrument as defined in claim 10 wherein the specific gravity of the inner container is greater than the specific gravity of the magnetic fluid, and the magnetic flux producing means are mounted on at least two substantially longitudinal lines drawn on the lower portions of the outer container.
Claim 18
Dependent Claim
49 words
A gyroscopic instrument as defined in claim 10 wherein the specific gravity of the inner container is less than the specific gravity of the magnetic fluid, and the magnetic flux producing means are mounted on at least two substantially longitudinal lines on the upper portions of the outer container.
Claim 19
Dependent Claim
31 words
A gyroscopic instrument as defined in claim 10 wherein the magnetic flux producing means are mounted on a plurality of substantially horizontal or substantially longitudinal lines drawn on the outer container.
Claim 20
Dependent Claim
25 words
A gyroscopic instrument as defined in claims 10, 12, 13, 14, 15, 16 or 17 wherein the magnetic flux producing means is a permanent magnet.
Claim 21
Dependent Claim
24 words
A gyroscopic instrument as defined in claims 10, 12, 13, 14, 15, 16 or 17 wherein the magnetic flux producing means is an electro-magnet.
Claim 22
Dependent Claim
14 words
A gyroscopic instrument as defined in claim 10 wherein the magnetic fluid is conductive.
Claim 23
Dependent Claim
34 words
A gyroscopic instrument as defined in claim 10 wherein the magnetic flux producing means are respectively mounted on the outer container at the angular points of a regular polygon inscribed within the outer container.
Claim 24
Dependent Claim
18 words
A gyroscopic instrument as defined in claim 21 wherein the magnetic flux producing means is a permanent magnet.
Claim 25
Dependent Claim
17 words
A gyroscopic instrument as defined in claim 21 wherein the magnetic flux producing means is an electro-magnet.
Claim 26
Dependent Claim
16 words
A gyroscopic instrument as defined in claim 10 wherein portions of the outer container are magnetized.
Claim 27
Dependent Claim
26 words
A gyroscopic instrument as defined in claim 10 wherein polar orientation of said magnetic flux producing means is substantially along a diameter of said outer container.
Claim 28
Dependent Claim
27 words
A gyroscopic instrument as defined in claim 10 wherein polar orientation of said magnetic flux producing means is substantially perpendicular to a diameter of said outer container.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |