Patent US3774447A successfully refreshed from Google Patents.
US3774447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow ratio and pressure ratio indicating device
Assignee: Teledyne Inc
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Filing: 1972-05-30
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Granted: 1973-11-27
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Expires: 1992-05-30
Abstract
Abstract This instrument has a generally cylindrical casing member with an inner stop wedge for stopping rotation of an inner vane in either direction. A novel feature is an arcuate gas or other fluid discharge port in the bottom surface over which the rotatably mounted vane can travel in close proximity thereto. A suitable fluid inlet port is provided in the bottom surface on either side of the stop wedge and adjacent the wedge. The bottom surface may be part of a plate or disc screwed or otherwise fastened to the cylindrical casing portion or integral therewith. Similarly the upper closure member may be a disc attached to the cylindrical casing portion and having a central hole through which a shaft attached to the vane is rotatable. This shaft carries a pointer which indicates flow ratio or pressure ratio of the fluid on the respective faces of the vane which takes up a position depending upon the ratio of fluid flow through the two inlet ports. It is preferable that the vane be of aluminum or other light weight material. The vane can be cemented to the shaft or pressed into a slot in the shaft.
Inventors
- 👤 E Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:35
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/28; G01L; G01L11/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
251 words
In an instrument for determining the ratio of fluid flow through first fluid supply means and through second fluid supply means connected with said instrument, a casing having a portion of its interior surface of cylindrical curvature and other portions of spaced parallel inner surfaces, a shaft having at least a portion thereof within said casing, bearing means supporting said shaft for rotary movement, partition means extending from an inner surface of said casing to the close proximity of said shaft, a vane attached to said shaft and movable relative to said cylindrical casing portion and said other portions in sufficiently close proximity thereto to prevent substantial flow of fluid through the spaces between said vane and said casing portions; said vane, partition and casing portions forming in effect two chambers the relative volumes of which are dependent upon the position of said vane relative to said partition; at least one of said casing portions having a curved slot therein positioned to be swept over by said vane as it is moved through an arc, said slot acting as a discharge port for fluid passing through said chambers, said first fluid supply means being connected with one said chamber and said second fluid supply means being connected with the other said chamber; the position of said vane relative to said casing being dependent upon the ratio of fluid flow through said first and second fluid supply means; and means including means dependent upon movement of said vane for indicating said ratio.
Claim 2
Dependent Claim
251 words
In an instrument for determining the ratio of fluid flow through first fluid supply means and through second fluid supply means connected with said instrument, a casing having a portion of its interior surface of cylindrical curvature and other portions of spaced parallel inner surfaces, a shaft having at least a portion thereof within said casing, bearing means supporting said shaft for rotary movement, partition means extending from an inner surface of said casing to the close proximity of said shaft, a vane attached to said shaft and movable relative to said cylindrical casing portion and said other portions in sufficiently close proximity thereto to prevent substantial flow of fluid through the spaces between said vane and said casing portions; said vane, partition and casing portions forming in effect two chambers the relative volumes of which are dependent upon the position of said vane relative to said partition; at least one of said casing portions having a curved slot therein positioned to be swept over by said vane as it is moved through an arc, said slot acting as a discharge port for fluid passing through said chambers, said first fluid supply means being connected with one said chamber and said second fluid supply means being connected with the other said chamber; the position of said vane relative to said casing being dependent upon the ratio of fluid flow through said first and second fluid supply means; and means including means dependent upon movement of said vane for indicating said ratio.
Claim 3
Dependent Claim
14 words
The instrument as described in claim 1 said slot being co-axial with said shaft.
Claim 4
Dependent Claim
19 words
The instrument as described in claim 1, said slot being curved and in one of said other casing portions.
Claim 5
Dependent Claim
13 words
The instrument as described in claim 1, said slot being on non-uniform width.
Claim 6
Dependent Claim
20 words
The instrument as described in claim 1 and including restricting means in at least one of said fluid supply means.
Claim 7
Dependent Claim
18 words
The instrument as described in claim 1 and including restricting means in both of said fluid supply means.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |