US3341760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End position indicating devices for valve actuators
Assignee: Rotork PLC
•
Filing: 1964-06-05
•
Granted: 1967-09-12
•
Expires: 1984-06-05
Abstract
No abstract record available.
Inventors
- 👤 Fry Jeremy Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:01
CPC Classifications
F; F16; F16K; F16K37/00; F16K37/0008; H; H01; H01H; H01H19/00; H01H19/02; H01H19/10; H01H19/14; H01H19/18; H01H19/186
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A VALVE ACTUATOR COMPRISING AN OUTPUT SHAFT; POWER MEANS OPERABLE TO SELECTIVELY ROTATE SAID OUTPUT SHAFT TO OPEN OR CLOSE A VALVE IN RESPONSE TO ROTATION OF SAID OUTPUT SHAFT IN ONE OR OTHER DIRECTION; A VISUAL POSITION INDICATING DEVICE; AND A CONTROL UNIT FOR SAID POWER MEANS, SAID CONTROL UNIT INCLUDING A PAIR OF POSITION LIMIT SWITCHES CONNECTED IN CIRCUIT WITH SAID POWER MEANS, A SHAFT ROTATABLE IN RESPONSE TO ROTATIONAL MOVEMENT OF THE OUTPUT SHAFT, A THREADED HOLLOW SPINDLE MOUNTED ON SAID SHAFT AND FRICTIONALLY ROTATABLE THEREWITH, A NUT MOUNTED ON SAID THREADED SPINDLE AND NORMALLY RESTRAINED AGAINST ROTATION, SO AS TO TRAVEL ALONG THE SPINDLE IN ACCORDANCE WITH THE DIRECTION OF ROTATION OF THE OUTPUT SHAFT, SAID NUT BEING ROTATABLE WITH SAID THREADED SPINDLE WHEN SAID NUT REACHES ONE OF TWO EXTREME POSITIONS OF MOVEMENT ALONG SAID SPINDLE, SAID EXTREME POSITIONS CORRESPONDING
Claim 2
Dependent Claim
145 words
A VALVE ACTUATOR COMPRISING AN OUTPUT SHAFT; POWER MEANS OPERABLE TO SELECTIVELY ROTATE SAID OUTPUT SHAFT TO OPEN OR CLOSE A VALVE IN RESPONSE TO ROTATION OF SAID OUTPUT SHAFT IN ONE OR OTHER DIRECTION; A VISUAL POSITION INDICATING DEVICE; AND A CONTROL UNIT FOR SAID POWER MEANS, SAID CONTROL UNIT INCLUDING A PAIR OF POSITION LIMIT SWITCHES CONNECTED IN CIRCUIT WITH SAID POWER MEANS, A SHAFT ROTATABLE IN RESPONSE TO ROTATIONAL MOVEMENT OF THE OUTPUT SHAFT, A THREADED HOLLOW SPINDLE MOUNTED ON SAID SHAFT AND FRICTIONALLY ROTATABLE THEREWITH, A NUT MOUNTED ON SAID THREADED SPINDLE AND NORMALLY RESTRAINED AGAINST ROTATION, SO AS TO TRAVEL ALONG THE SPINDLE IN ACCORDANCE WITH THE DIRECTION OF ROTATION OF THE OUTPUT SHAFT, SAID NUT BEING ROTATABLE WITH SAID THREADED SPINDLE WHEN SAID NUT REACHES ONE OF TWO EXTREME POSITIONS OF MOVEMENT ALONG SAID SPINDLE, SAID EXTREME POSITIONS CORRESPONDING
References Cited (Backward Citations)
US1290718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |