EP0037654A2
Expired / Lapsed
EP
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Fluid-pressure responsive apparatus
Assignee: GIERS
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Filing: 1981-03-18
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Granted: —
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Expires: 2001-03-18
Abstract
Abstract A fluid pressure gauge comprises a unitary, sealed, U-shaped hollow tube (12) with an electrically conductive ribbon (14) stretched between the ends of its arms (18). Fluid pressure applied to the interior of the tube via an inlet (24) on the axis of symmetry tends to straighten the tube, thereby varying the tension in the ribbon. The tension, and thus the pressure, are sensed by measuring the natural frequency of electromagnetically-maintained transverse vibration of the ribbon. Adjustment of the initial tension of the ribbon enables temperature sensitivity of the gauge to be reduced. One arm of the tube can be omitted, the ribbon being connected chor- dally across the curved portion and the pressure being applied through the remaining arm, or alternatively the tube can be serpentine in form.
Inventors
- 👤 Sylvain Janssen
- 👤 Jean Sequies
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:05
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0001; G01L9/0008; G01L9/0013
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
Fluid-pressure responsive apparatus comprising: elongate means at least a portion of which is hollow and curved, and a resilient member interconnecting two points on said elongate means which are separated by said hollow, curved portion, whereby application of fluid pressure within said portion causes a change in tension in said resilient member; and means arranged to induce oscillation of said resilient member and to generate a signal related to the frequency of said oscillation; characterised in that at least the entirety of said hollow, curved portion of said elongate means is of unitary construction.
Claim 2
Dependent Claim
94 words
Fluid-pressure responsive apparatus comprising: elongate means at least a portion of which is hollow and curved, and a resilient member interconnecting two points on said elongate means which are separated by said hollow, curved portion, whereby application of fluid pressure within said portion causes a change in tension in said resilient member; and means arranged to induce oscillation of said resilient member and to generate a signal related to the frequency of said oscillation; characterised in that at least the entirety of said hollow, curved portion of said elongate means is of unitary construction.
Claim 3
Dependent Claim
21 words
Apparatus according to claim 1, characterised in that said curved portion of said elongate means is an arc of a circle.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 2, characterised in that said curved portion of said elongate means is semi-circular.
Claim 5
Dependent Claim
38 words
Apparatus according to any one of claims 1 to 3, characterised in that said elongate means has two straight limbs extending from said curved portion, and said points interconnected by said resilient member are located on said limbs.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 4, characterised in that said points are at the free ends of said limbs.
Claim 7
Dependent Claim
16 words
Apparatus according to claim 4, characterised in that said limbs are integral with said curved portion.
Claim 8
Dependent Claim
12 words
Apparatus according to claim 4, characterised in that said limbs are solid.
Claim 9
Dependent Claim
35 words
Apparatus according to any one of the preceding claims,characterised in that said elongate means has a pressure inlet and a support situated on said curved portion and on an axis of symmetry of the apparatus.
Claim 10
Dependent Claim
27 words
Apparatus according to claim 8, characterised in that said pressure inlet enters said elongate means in a direction approximately transverse to the plane of said curved portion.
Claim 11
Dependent Claim
50 words
10 . Apparatus according to any one of the preceding claims, characterised in that said resilient member is secured to said elongate means at a predetermined tension for zero applied pressure in said curved portion, said predetermined tension being selected substantially to minimise the sensitivity to temperature of the apparatus.
Claim 12
Dependent Claim
23 words
Apparatus according to any one of the preceding claims, characterised in that said hollow portion of said elongate means is oblate in cross-section.
Claim 13
Dependent Claim
25 words
Apparatus according to any one of the preceding claims, characterised in that said resilient member is secured to said elongate means at said two points.
References Cited (Backward Citations)
No citation records indexed.
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