US3660737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic escapement
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1970-10-27
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Granted: 1972-05-02
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Expires: 1990-10-27
Abstract
Abstract A magnetic escapement including a rotor driven by an external force, and escape wheel made of a magnetic material and having along its periphery radially extending magnetic teeth, said escape wheel being coupled through a coil spring to the rotor, and an oscillator having a magnetic pole piece secured at the end of one of its tines and coupled magnetically to the escape wheel teeth. The oscillator is preferably formed in a W-shape and supported at a point near its center of gravity for extension parallel to the plane of the escape wheel, and its pole piece being magnetically coupled to that tooth of the escape wheel which is farthest from the supporting point. A driving circuit of a constant output for the rotor is provided, which includes a compensating transistor and a temperature compensating element for eliminating load and temperature variations.
Inventors
- 👤 Satoshi Sakai
- 👤 Kenzo Shirakawa
- 👤 Norio Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:01
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/08; G04C3/10; G04C5/00; G04C5/005; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1502
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A magnetic escapement comprising a rotor, means providing a force for rotating said rotor, an escape wheel, a coil spring for coupling said escape wheel to said rotor, said escape wheel being formed of a magnetic material and having a plurality of magnetic teeth extending radially from the peripherey thereof at regular intervals, an oscillator extending in a direction parallel to said escape wheel, means for supporting said oscillator, and a permanent magnet at one only of the forward ends of said oscillator for oscillation in a direction parallel to the plane of the escape wheel.
Claim 2
Dependent Claim
96 words
A magnetic escapement comprising a rotor, means providing a force for rotating said rotor, an escape wheel, a coil spring for coupling said escape wheel to said rotor, said escape wheel being formed of a magnetic material and having a plurality of magnetic teeth extending radially from the peripherey thereof at regular intervals, an oscillator extending in a direction parallel to said escape wheel, means for supporting said oscillator, and a permanent magnet at one only of the forward ends of said oscillator for oscillation in a direction parallel to the plane of the escape wheel.
Claim 3
Dependent Claim
42 words
A magnetic escapement as claimed in claim 1 wherein said permanent magnet is secured to said one forward end of said oscillator opposed to the magnetic tooth of the escape wheel which is remote from the point of support of the oscillator.
Claim 4
Dependent Claim
32 words
A magnetic escapement as claimed in claim 1 wherein said oscillator is formed substantially in a W-shape and is supported by said support means at a position near its center of gravity.
Claim 5
Dependent Claim
65 words
A magnetic escapement as claimed in claim 1 wherein said oscillator is formed substantially in a W-shape and is supported by said support means at a position near its center of gravity, and further comprising a weight attached to the other of said forward ends of said oscillator, said weight being sufficient to absorb the specific frequency corresponding to the frequency in the asymetrical mode.
Claim 6
Dependent Claim
83 words
A magnetic escapement as claimed in claim 1 wherein said permanent magnet is provided with a magnetic pole at each end thereof, one of said poles being opposed to the magnetic force of the said escape wheel and further comprising means for adjusting the speed of oscillation of said oscillator made of a magnetic material and movable in the oscillating direction of said oscillator, the other of the poles of said permanent magnet being opposed to the magnetic force of said adjusting means.
Claim 7
Dependent Claim
135 words
A magnetic escapement as claimed in claim 1 wherein said means for rotating said rotor comprises a rotor driving circuit including a first transistor, a detecting coil connected between the emitter and base of said first transistor, a driving coil connected in series with said detecting coil for exciting said rotor and connected between the emitter and collector of said first transistor through a source of current, the junction point of said detecting coil and driving coil being connected to the emitter of said first transistor, a second compensating transistor having the base connected to an intermediate tap on said driving coil and the collector connected to an end terminal of said driving coil, and a temperature compensating element inserted between the emitter of said second compensating transistor and the base of said first transistor.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |