US3884078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure measuring transformer
Assignee: Individual
•
Filing: 1973-06-15
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Granted: 1975-05-20
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Expires: 1993-06-15
Abstract
Abstract A low-pressure measuring transformer, in particular for explosion-prevention devices, comprising an expansion joint internally impinged upon by the measuring pressure, carrying strain gauges and designed as a thin-walled tube, and supported with both of its open extremities by members of the measuring transformer located opposite each other in such a manner as to provide both elasticity and effective sealing.
Inventors
- 👤 Rudolf Zeiringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:17
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0001; G01L9/0002
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
A low-pressure measuring transformer, in particular for explosion-prevention devices, comprising a housing having an open extremity, a bottom portion terminating the housing at said open extremity and having a central through bore, an abutment arranged in the housing in spaced relation to said bottom portion, said bottom portion and said abutment being designed as rigidly interconnected plates having an annular groove on each of the front ends opposing each other, a flexible flat ring and two Oshaped rings each adjoining same being arranged in concentric relation to each other and being inserted in each of the annular grooves, an expansion joint designed as a thin-walled tube open at both ends extending from said bottom-portion as far as said abutment, each of the open tube ends protruding into one of the annular grooves of the bottom portion and of the abutments and clamped between the concentrically arranged O-shaped rings so as to form a flexible seal, at least two strain gauges located in opposite outer surfaces of said expansion joint, the expansion joint being impinged upon internally by the pressure to be measured through the bore of the bottom portion.
Claim 2
Dependent Claim
189 words
A low-pressure measuring transformer, in particular for explosion-prevention devices, comprising a housing having an open extremity, a bottom portion terminating the housing at said open extremity and having a central through bore, an abutment arranged in the housing in spaced relation to said bottom portion, said bottom portion and said abutment being designed as rigidly interconnected plates having an annular groove on each of the front ends opposing each other, a flexible flat ring and two Oshaped rings each adjoining same being arranged in concentric relation to each other and being inserted in each of the annular grooves, an expansion joint designed as a thin-walled tube open at both ends extending from said bottom-portion as far as said abutment, each of the open tube ends protruding into one of the annular grooves of the bottom portion and of the abutments and clamped between the concentrically arranged O-shaped rings so as to form a flexible seal, at least two strain gauges located in opposite outer surfaces of said expansion joint, the expansion joint being impinged upon internally by the pressure to be measured through the bore of the bottom portion.
Claim 3
Dependent Claim
23 words
A measuring transformer according to claim 1, wherein said flexible flat ring is integral with the two concentrically arranged O-shaped rings adjoining same.
Claim 4
Dependent Claim
36 words
A measuring transformer according to claim 1, wherein the tubular expansion joint is of a O-shaped flattened cross-section, each of the flattened broadsides of its jacket carrying one of said strain gauges approximately in the middle.
Claim 5
Dependent Claim
57 words
A measuring transformer according to claim 3, comprising a compensating strain gauge each arranged on the arcuate narrow sides of the jacket of the tubular expansion joint, an electric resistance-measuring bridge comprising four bridge arms, the strain gauges being arranged in two opposite bridge arms and the compensating strain gauges in the remaining two opposite bridge arms.
Claim 6
Dependent Claim
35 words
A measuring transformer according to claim 1, wherein the tubular expansion joint is of an elliptic cross-section and carries one of the strain gauges approximately in the middle of the flattened broadsides of its jacket.
Claim 7
Dependent Claim
60 words
A measuring transformer according to claim 1, wherein the bottom portion comprises an adapter nipple to be screwed in at the measuring point and traversed by the bore of the bottom portion, and wherein a number of additional bores are provided emerging from the first-mentioned bore of the bottom portion and terminating in the interior of the tubular expansion joint.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |