Patent US3438034A successfully refreshed from Google Patents.
US4023431A
Expired / Lapsed
US
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Spring loaded split nut
Assignee: Bettis Corp
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Filing: 1975-05-05
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Granted: 1977-05-17
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Expires: 1995-05-05
Abstract
Abstract Spring loaded member for automatically biasing a split nut toward engagement with a threaded rod, and rotatable cam member for effecting disengagement.
Inventors
- 👤 Garnet L. Pavlas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:22
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/50; F16K31/502; F16K31/12; F16K31/14; F16K31/143; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19805
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
In an actuator having power driven linearly movable piston means for rotating a valve stem, and back-up means for rotating such valve stem, wherein such back-up means includes a rotatable threaded screw, means for coupling said piston means to said valve stem, and means for releasably engaging said screw with said coupling means, the improvement comprising: means for biasing said engaging means toward a position resulting in screw engagement, said coupling means includes a retainer fixed to said piston means for movement therewith and having an unthreaded passageway therethrough for slidably receiving said screw, said engaging means includes a split nut having a threaded portion engageable with said screw, and said biasing means includes at least one spring.
Claim 2
Dependent Claim
118 words
In an actuator having power driven linearly movable piston means for rotating a valve stem, and back-up means for rotating such valve stem, wherein such back-up means includes a rotatable threaded screw, means for coupling said piston means to said valve stem, and means for releasably engaging said screw with said coupling means, the improvement comprising: means for biasing said engaging means toward a position resulting in screw engagement, said coupling means includes a retainer fixed to said piston means for movement therewith and having an unthreaded passageway therethrough for slidably receiving said screw, said engaging means includes a split nut having a threaded portion engageable with said screw, and said biasing means includes at least one spring.
Claim 3
Dependent Claim
25 words
The device of claim 1 wherein each of said retainer and said split nut includes a spring seat, said spring being positioned between said seats.
Claim 4
Dependent Claim
118 words
In an actuator having power driven linearly movable piston means for rotating a valve stem, and back-up means for rotating such valve stem, wherein such back-up means includes a rotatable threaded screw, means for coupling such piston means to said valve stem and means for releasably engaging said screw with said coupling means, the improvement comprising: means for biasing said engaging means toward a position resulting in screw disengagement, said coupling means includes a retainer fixed to said piston means for movement therewith and having an unthreaded passageway therethrough for slidably receiving said screw, said engaging means includes a split nut having a threaded portion engageable with said screw, and said biasing means includes at least one spring.
Claim 5
Dependent Claim
118 words
In an actuator having power driven linearly movable piston means for rotating a valve stem, and back-up means for rotating such valve stem, wherein such back-up means includes a rotatable threaded screw, means for coupling such piston means to said valve stem and means for releasably engaging said screw with said coupling means, the improvement comprising: means for biasing said engaging means toward a position resulting in screw disengagement, said coupling means includes a retainer fixed to said piston means for movement therewith and having an unthreaded passageway therethrough for slidably receiving said screw, said engaging means includes a split nut having a threaded portion engageable with said screw, and said biasing means includes at least one spring.
Claim 6
Dependent Claim
25 words
The device of claim 3 wherein each of said retainer and said split nut includes a spring seat, said spring being positioned between said seats.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |