US3789668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overload protected bourdon tube
Assignee: Dresser Industries Inc
•
Filing: 1972-08-23
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Granted: 1974-02-05
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Expires: 1992-08-23
Abstract
Abstract A sealed Bourdon tube responsive to externally applied pressures for effecting displacement within operating ranges correlated to the magnitude of pressure being applied. Preconditioning of the Bourdon tube includes a permanent fluid fill with an incompressible liquid of controlled volume corresponding to the decreased internal tube volume when the tube is subject to application of a predetermined overpressure. The confined fluid thereafter presets an overload limit beyond which the tube cannot subsequently be further displaced irrespective of the increasing magnitude of pressure being applied.
Inventors
- 👤 R Bissell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:29
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/06; G01L19/0618; G01L19/04; G01L7/00; G01L7/02; G01L7/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
In a Bourdon tube sealed at both ends for response to external pressure variations, an overload limit comprising a controlled volume of an incompressible fluid means internally of said tube For limiting response thereof to a predetermined value of increasing external pressure, said controlled volume being less than the internal volume of said tube when tube is exposed to values of external pressure below said predetermined value.
Claim 2
Dependent Claim
67 words
In a Bourdon tube sealed at both ends for response to external pressure variations, an overload limit comprising a controlled volume of an incompressible fluid means internally of said tube For limiting response thereof to a predetermined value of increasing external pressure, said controlled volume being less than the internal volume of said tube when tube is exposed to values of external pressure below said predetermined value.
Claim 3
Dependent Claim
37 words
In a Bourdon tube according to claim 1 in which the controlled volume of said fluid means within said tube corresponds substantially to a decreased internal volume of said tube when exposed to said predetermined pressure value.
Claim 4
Dependent Claim
24 words
In a Bourdon tube according to claim 2 in which said predetermined pressure value is intermediate the tube values of operating limit and overstress.
Claim 5
Dependent Claim
18 words
In a Bourdon tube according to claim 3 in which said fluid means is of a silicone composition.
Claim 6
Dependent Claim
18 words
In a Bourdon tube according to claim 3 in which said fluid means is of a glycerin composition.
Claim 7
Dependent Claim
84 words
Pressure responsive apparatus comprising in combination: a. means defining an enclosed chamber adapted for communication with a variable pressure source; b. a Bourdon tube mounted within said chamber for responding to the pressure variations from said source acting therein externally on said tube; c. means operably connected to said Bourdon tube providing an output indicia correlated to deflection changes incurred by said tube; and d. incompressible fluid means internally of said tube for limiting deflection response thereof to a predetermined value of increasing pressure.
Claim 8
Dependent Claim
84 words
Pressure responsive apparatus comprising in combination: a. means defining an enclosed chamber adapted for communication with a variable pressure source; b. a Bourdon tube mounted within said chamber for responding to the pressure variations from said source acting therein externally on said tube; c. means operably connected to said Bourdon tube providing an output indicia correlated to deflection changes incurred by said tube; and d. incompressible fluid means internally of said tube for limiting deflection response thereof to a predetermined value of increasing pressure.
Claim 9
Dependent Claim
35 words
Apparatus according to claim 6 in which the volume of said fluid means within said Bourdon tube corresponds substantially to a decreased internal volume of said Bourdon tube when exposed to said predetermined pressure value.
Claim 10
Dependent Claim
22 words
Apparatus according to claim 7 in which said predetermined pressure value is intermediate the Bourdon tube values of operating limit and overstress.
Claim 11
Dependent Claim
15 words
Apparatus according to claim 8 in which said fluid means is of a silicone composition.
Claim 12
Dependent Claim
15 words
Apparatus according to claim 8 in which said fluid means is of a glycerin composition.
References Cited (Backward Citations)
US1408121A
Cited
US3626759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |