Patent US3883136A successfully refreshed from Google Patents.
US3883136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic swing operated by electricity
Assignee: Individual
•
Filing: 1973-05-18
•
Granted: 1975-05-13
•
Expires: 1993-05-18
Abstract
Abstract An automatic swing structure which is actuated by repelling magnetic fields periodically established by an electric circuit including a stationary electro-magnet and a movable permanent magnet mounted to the swing which moves through the magnetic field of the stationary electro-magnet with each oscillation of the swing.
Inventors
- 👤 Young Ho Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:18
CPC Classifications
A; A47; A47D; A47D13/00; A47D13/10; A47D13/105; A63; A63G; A63G9/00; A63G9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
An automatic swing comprising: a main frame; a swing arm pivotally connected at its upper end to said main frame; a first permanent magnet affixed to the bottom end of said swing arm; an electro-magnet affixed to the bottom of said main frame immediately below the path of the permanent magnet; and electrical circuit means isolated from said main frame and said swing arm for selectively energizing said electro-magnet and effecting an automatic oscillatory movement of aid swing arm by coaction between the magnetic field of said permanent magnet afffixed to said swing arm and the magnetic field of said electro-magnet, wherein said electrical circuit means includes: a normally open switch; a second permanent magnet affixed to said normally open switch and coacting with said first permanent magnet to close said switch only while said first permanent magnet is positioned proximate said electro-magnet, electrical resistance means; and switch means for selectively coupling said resistance means into and out of said circuit for varying the amplitude of oscillation of said swing arm.
Claim 2
Dependent Claim
171 words
An automatic swing comprising: a main frame; a swing arm pivotally connected at its upper end to said main frame; a first permanent magnet affixed to the bottom end of said swing arm; an electro-magnet affixed to the bottom of said main frame immediately below the path of the permanent magnet; and electrical circuit means isolated from said main frame and said swing arm for selectively energizing said electro-magnet and effecting an automatic oscillatory movement of aid swing arm by coaction between the magnetic field of said permanent magnet afffixed to said swing arm and the magnetic field of said electro-magnet, wherein said electrical circuit means includes: a normally open switch; a second permanent magnet affixed to said normally open switch and coacting with said first permanent magnet to close said switch only while said first permanent magnet is positioned proximate said electro-magnet, electrical resistance means; and switch means for selectively coupling said resistance means into and out of said circuit for varying the amplitude of oscillation of said swing arm.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |