Patent US924689A successfully refreshed from Google Patents.
Patent US3628329A successfully refreshed from Google Patents.
US3628329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engine inlet guide vane actuator with automatic reset
Assignee: General Electric Co
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Filing: 1970-02-24
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Granted: 1971-12-21
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Expires: 1990-02-24
Abstract
Abstract An actuator is described which positions an element upon sensing a parameter and, after a certain time limit has elapsed, automatically repositions the element to its initial position. A central solid rod is surrounded by a thin perforated sleeve constructed of material having the same coefficient of expansion as the rod. The rod and sleeve are rigidly interconnected at one end, and hot gas is passed in a swirling manner along the axis of the actuator. The time differential expansion of the two members is utilized to initially position and then reposition a controlled element.
Inventors
- 👤 William R Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:01
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/16; F02C9/20; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/162; Y; Y10; Y10T; Y10T137/00; Y10T137/1407; Y10T137/7722; Y10T137/7723; Y10T137/7724; Y10T137/7737
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
A servo actuator comprising: a casing having an inlet and an outlet for the flow of fluid therethrough; a solid rod positioned within said casing; a perforated sleeve coaxially surrounding said rod, said sleeve being positioned between said rod and said casing; means for connecting a first end of said rod to a corresponding end of said sleeve; means for preventing the flow of fluid between a second end of said sleeve and a second end of said rod while permitting relative axial motion therebetween; means for restraining axial movement of said second end of said rod; means for delivering a hot fluid to the interior of said casing; and said rod and said sleeve being constructed of materials having substantially the same coefficients of thermal expansion whereby thermal expansion of said sleeve caused by said hot fluid will be equaled by thermal expansion of said rod after the occurrence of some finite time period.
Claim 2
Dependent Claim
155 words
A servo actuator comprising: a casing having an inlet and an outlet for the flow of fluid therethrough; a solid rod positioned within said casing; a perforated sleeve coaxially surrounding said rod, said sleeve being positioned between said rod and said casing; means for connecting a first end of said rod to a corresponding end of said sleeve; means for preventing the flow of fluid between a second end of said sleeve and a second end of said rod while permitting relative axial motion therebetween; means for restraining axial movement of said second end of said rod; means for delivering a hot fluid to the interior of said casing; and said rod and said sleeve being constructed of materials having substantially the same coefficients of thermal expansion whereby thermal expansion of said sleeve caused by said hot fluid will be equaled by thermal expansion of said rod after the occurrence of some finite time period.
Claim 3
Dependent Claim
27 words
A servo actuator as recited in claim 1 in combination with means for positioning a controllable element by the position of said second end of said sleeve.
Claim 4
Dependent Claim
39 words
A servo actuator as recited in claim 2 wherein said axial movement restraining means includes a bracket having an opening therein for receiving said second end of said rod and means for rigidly connecting said rod to said bracket.
Claim 5
Dependent Claim
60 words
A servo actuator as recited in claim 3 wherein said means for connecting said rod to said bracket include a flange formed on said rod intermediate said first and second ends, said second end of said rod including a threaded portion, said threaded portions extending through said bracket opening, and a nuT for threadably connecting said rod to said bracket.
Claim 6
Dependent Claim
34 words
A servo actuator as recited in claim 4 wherein said element positioning means include a lever pivotally connected to said bracket, and means for connecting said lever to said second end of said sleeve.
Claim 7
Dependent Claim
34 words
A servo actuator as recited in claim 5 wherein said lever connecting means include a pin extending through said lever and further extending into an opening formed within said second end of said sleeve.
Claim 8
Dependent Claim
23 words
A servo actuator as recited in claim 6 wherein said inlet comprises a tangential opening formed within said casing adjacent one end thereof.
Claim 9
Dependent Claim
23 words
A servo actuator as recited in claim 7 wherein said outlet comprises an axial opening formed in the opposite end of said casing.
Claim 10
Dependent Claim
29 words
A servo actuator as recited in claim 8 wherein said fluid delivering means further include means for varying the amount of fluid delivered to said interior of said casing.
Claim 11
Dependent Claim
39 words
A servo actuator as recited in claim 2 in combination with an aircraft gas turbine engine including an axial flow compressor having variable stator vanes, said second end of said sleeve controlling the position of said variable stator vanes.
Claim 12
Dependent Claim
19 words
A servo actuator as recited in claim 10 wherein said hot fluid comprises air from said axial flow compressor.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |