US4167848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving device for an electric timepiece
Assignee: Hollingsworth UK Ltd
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Filing: 1978-07-25
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Granted: 1979-09-18
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Expires: 1998-07-25
Abstract
Abstract A driving device including a magnetized driving rotor mounted for rotation within a magnetic field produced in a coreless coil, and, in order to make the magnetic pole of said driving rotor deviate by a definite angle relative to the magnet field direction of said coil, a supplementary magnetized rotor mounted for rotation outside of the coil and magnetically coupled with the driving rotor. And the supplementary rotor is provided with magnetic poles, the number thereof being greater than the number of poles of said driving rotor. The driving rotor has an odd number of pole pairs.
Inventors
- 👤 Kiyoshi Kitai
- 👤 Masuo Ogihara
- 👤 Kozo Sato
- 👤 Nobuo Shinozaki
- 👤 Yoichi Seki
- 👤 Yusuru Takazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:26
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/12; H02K37/14; G; G04; G04C; G04C13/00; G04C13/08; G04C13/10; G04C13/11; H02K7/00; H02K7/10; H02K7/11
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
An electronic driving device, comprising; a coreless coil energizable by an electric current for developing a magnetic field along an axial dimension of said coreless coil; a first magnetized rotor disposed completely within said coreless coil and mounted for rotation within said coreless coil and having a plurality of circumferentially equi-spaced magnetic poles; a second magnetized rotor mounted for rotation externally of said coreless coil and positioned relative to said first rotor for magnetic coupling therewith and having a plurality of circumferentially equi-spaced magnetic poles, said first and said second rotors having respective axes of rotation defining therebetween a straight line non-colinear with the axial dimension of said coreless coil and intersecting the axial dimensions of said coreless coil, and wherein said second magnetized rotor has a greater number of magnetic poles than the number of magnetic poles of said first magnetized rotor.
Claim 2
Dependent Claim
143 words
An electronic driving device, comprising; a coreless coil energizable by an electric current for developing a magnetic field along an axial dimension of said coreless coil; a first magnetized rotor disposed completely within said coreless coil and mounted for rotation within said coreless coil and having a plurality of circumferentially equi-spaced magnetic poles; a second magnetized rotor mounted for rotation externally of said coreless coil and positioned relative to said first rotor for magnetic coupling therewith and having a plurality of circumferentially equi-spaced magnetic poles, said first and said second rotors having respective axes of rotation defining therebetween a straight line non-colinear with the axial dimension of said coreless coil and intersecting the axial dimensions of said coreless coil, and wherein said second magnetized rotor has a greater number of magnetic poles than the number of magnetic poles of said first magnetized rotor.
Claim 3
Dependent Claim
31 words
An electric driving device as claimed in claim 1, wherein said first magnetized rotor has two diametrically opposed magnetic poles, and said second magnetized rotor has four circumferentially equi-spaced magnetic poles.
Claim 4
Dependent Claim
36 words
An electric driving device as claimed in claim 1, wherein a circumferential distance between successive poles of said first magnetized rotor is substantially equal to a circumferential distance between successive poles of said second magnetized rotor.
Claim 5
Dependent Claim
38 words
An electric driving device as claimed in claim 1, wherein said second magnetized rotor includes a gear concentric with the axis of rotation of said second rotor for driving a gear train upon rotation of said second rotor.
Claim 6
Dependent Claim
99 words
An electric driving device as claimed in claim 1, wherein said first magnetized rotor has two diametrically opposed poles and said second magnetized rotor has four circumferentially equi-spaced magnetic poles, in combination with a gear train comprising a first pinion mounted for rotation with said second rotor, an intermediate gear engaging said first pinion, a second pinion mounted for rotation with said intermediate gear, a second-hand gear engaging said second pinion, and a second-hand mounted for rotation with said second-hand gear, and wherein the reduction ratio of said gear train between said second rotor and said second-hand is 1:15.
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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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |