US3825781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically driven timer
Assignee: General Electric Co
•
Filing: 1973-01-15
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Granted: 1974-07-23
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Expires: 1993-01-15
Abstract
Abstract A magnetically driven timer is disclosed comprising electric switch means, a generally disc shaped rotatable magnetic follower, and means for dampening hunting action by the magnetic follower when rotatably driven by extrinsic magnetic drive means. Rotational speed reduction means are coupled with the magnetic follower. Switch actuation means are coupled with the rotational speed reduction means for actuating the switch means.
Inventors
- 👤 L Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:07
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H01; H01H; H01H43/00; H01H43/10; H02K49/10; H02K49/104; H02K49/108; H02K5/00; H02K5/04; H02K5/12; H02K5/128
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
In a timer adapted to be mounted adjacent a rotatable magnetic driving means, means responsive to a magnetic field established upon rotation of the driving means for driven magnetic coupling rotation generally in synchronous with the driving means; and means for correcting nonsynchronous hunting action of the driven means relative to the driving means upon the magnetic coupling rotation thereof comprising a relatively thin nonmagnetic member having a relatively great electrical conductive capacity for disposition between the driving means and the driven means and spaced closely adjacent the driven means, the member being effective to conduct eddy currents generated upon the establishment of the magnetic field and the eddy currents themselves also establishing another magnetic field in opposition to the first named magnetic field and acting on the driven means for correcting the nonsynchronous hunting action thereof relative to the rotation of the driving means.
Claim 2
Dependent Claim
145 words
In a timer adapted to be mounted adjacent a rotatable magnetic driving means, means responsive to a magnetic field established upon rotation of the driving means for driven magnetic coupling rotation generally in synchronous with the driving means; and means for correcting nonsynchronous hunting action of the driven means relative to the driving means upon the magnetic coupling rotation thereof comprising a relatively thin nonmagnetic member having a relatively great electrical conductive capacity for disposition between the driving means and the driven means and spaced closely adjacent the driven means, the member being effective to conduct eddy currents generated upon the establishment of the magnetic field and the eddy currents themselves also establishing another magnetic field in opposition to the first named magnetic field and acting on the driven means for correcting the nonsynchronous hunting action thereof relative to the rotation of the driving means.
Claim 3
Dependent Claim
181 words
In a timer for controlling operations of an appliance or the like, a casing for mounting adjacent a rotatable magnetic driving means, means in the casing for driven magnetic coupling rotation with the driving means, electrical switch means mounted to the casing, means coupled with the driven means for actuating the electrical switch means upon the magnetic coupling rotation of the driving means and the driven means; at least a portion of the casing including a relatively thin nonmagnetic material having a relatively great electrical conductive capacity generally spaced closely adjacent the driven means and adapted to be disposed adjacent the driving means, and the nonmagnetic electrical conductive material being generally effective to conduct eddy currents generated in response to the magnetic coupling rotation of the driving means and the driven means and the generated eddy currents themselves also establishing a magnetic field of sufficient flux density generally in opposition to the magnetic field effected upon the magnetic coupling rotation of the driving means and the driven means for damping hunting action of the driven means relative to the driving means.
Claim 4
Dependent Claim
181 words
In a timer for controlling operations of an appliance or the like, a casing for mounting adjacent a rotatable magnetic driving means, means in the casing for driven magnetic coupling rotation with the driving means, electrical switch means mounted to the casing, means coupled with the driven means for actuating the electrical switch means upon the magnetic coupling rotation of the driving means and the driven means; at least a portion of the casing including a relatively thin nonmagnetic material having a relatively great electrical conductive capacity generally spaced closely adjacent the driven means and adapted to be disposed adjacent the driving means, and the nonmagnetic electrical conductive material being generally effective to conduct eddy currents generated in response to the magnetic coupling rotation of the driving means and the driven means and the generated eddy currents themselves also establishing a magnetic field of sufficient flux density generally in opposition to the magnetic field effected upon the magnetic coupling rotation of the driving means and the driven means for damping hunting action of the driven means relative to the driving means.
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |