Rotary actuator
Abstract
Abstract A ROTARY ACTUATOR FOR PROVIDING A SLOW-MOTION DRIVE TO THE SPINDLE OF A FLUID-CONTROLLING VALVE, FROM AN AXIALLY ALIGNED INPUT SHAFT. THE INPUT SHAFT IS THREADED AND CARRIES A NUT HAVING TWO PROJECTIONS WHICH PASS THROUGH LENGTHWISE SLOTS IN A SURROUNDING SLEEVE AND ALSO ENGAGE HELICAL SLOTS IN A STATIONARY CASING. THE SLEEVE IS SECURED TO THE VALVE SPINDLE. AXIAL MOVEMENT OF THE NUT ALSO CAUSES THE NUT TO BE ROTATED SLOWLY BY THE ACTION OF THE HELICAL SLOTS UPON THE PROJECTIONS. THE SLEEVE IS ROTATED BY THE PROJECTIONS AND DRIVES THE VALVE SPINDLE. THE AXIAL EXTENT OF THE SLOTS IN THE SLEEVE IS GREATER THAN THE EXTENT OF THE HELICAL SLOTS. NO AXIAL LOAD IS THEREFORE TRANSMITTED TO THE VALVE SPINDLE.
Inventors
- 👤 Bernard D Williams
Bibliographic Details
Claims Analysis
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |