US3588652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail safe mechanism for reversible motors
Assignee: Neles Jamesbury Inc
•
Filing: 1969-10-06
•
Granted: 1971-06-28
•
Expires: 1989-10-06
Abstract
Abstract AN ELECTRIC FAIL SAFE DEVICE FOR A VALVE ACTUATOR COMPRISING A REVERSIBLE MOTOR WHEREIN THE APPLICATION OF ELECTRIC CURRENT TO DRIVE THE REVERSIBLE MOTOR FROM ITS "SAFE" POSITION ENERGIZES A RELAY AND CHARGES A CAPACITOR. UPON FAILURE OF THE POWER SUPPLY, THE RELAY IS DEENERGIZED AND THE ENERGY STORED IN THE CAPACITOR IS USED TO DRIVE THE REVERSIBLE MOTOR TO RETURN THE VALVE TO ITS "SAFE" POSITION. LIMIT SWITCHES ARE PROVIDED TO DISCONNECT THE MOTOR FROM THE DRIVING CIRCUITRY WHENEVER THE MOTOR HAS COMPLETELY OPENED OR COMPLETELY CLOSED THE VALVE.
Inventors
- 👤 Robin B Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:14
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/09
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References 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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |