Electric control circuits for electromagnetic devices
Abstract
Abstract AN ELECTRIC CONTROL CIRCUIT FOR AN ELECTROMAGNETIC DEVICE SUCH AS CLUTCH OR A BRAKE INCLUDES A FIRST MEANS FOR ENERGISING THE COIL OF THE DEVICE TO OPERATE THE DEVICE AND A SECOND MEANS FOR SUBSEQUENTLY PROVIDING A REVERSE CURRENT FLOW THROUGH THE COIL WHEREBY RAPIDLY TO REDUCE THE ENERGISATION OF THE COIL. THE FIRST MEANS INCLUDES AN ENERGISING CIRCUIT FOR THE COIL HAVING A CAPACITOR AND A FIRST CONTROLLED IMPEDANCE DEVICE WHICH IS OPERABLE BY A CONTROL SIGNAL TO ENERGISE THE COIL AND CHARGE THE CAPACITOR. THE SECOND MEANS INCLUDES A DISCHARGE CIRCUIT FOR THE CAPACITOR AND COMPRISES THE COIL AND A SECOND CONTROLLED IMPEDIANCE DEVICE WHICH OPERATES ONLY WHEN THE FIRST CONTROLLED IMPEDANCE DEVICE IS RENDERED INOPERATIVE. WHEN IT IS REQUIRED TO REDUCE THE ENERGISATION OF THE COIL, THE FIRST CONTROLLED IMPEDANCE DEVICE IS RENDERED INOPERATIVE WHEREUPON THE SECOND CONTROLLED IMPEDANCE DEVICE AUTOMATICALLY OPERATES TO DISCHARGE THE CAPACITOR THROUGH THE COIL TO PROVIDE THE REVERSE CURRENT FLOW THERETHROUGH.
Inventors
- 👤 Roman Derc
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |