Patent US3899766A successfully refreshed from Google Patents.
US3899766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure transducer
Assignee: Tyco International Ltd
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Filing: 1974-03-29
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Granted: 1975-08-12
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Expires: 1994-03-29
Abstract
Abstract A transducer is shown which includes a pressure fitting, a diaphragm, a strain gage comprising a bridge circuit and tabs with leads for the bridge circuit, and a termination board, all contained within a case. One end of the case is swaged over a flange on the fitting in order to sealingly clamp the diaphragm between a shoulder in the case and the fitting flange. The bridge portion of the strain gage is adhesively secured to the diaphragm. A pressure distribution member is placed over the bridge so pressure may be applied to the assembly during heatcuring of the adhesive which secures the gage to the diaphragm. The termination board has four terminals and a corresponding number of conductive strips. It is positioned in the case so that each of the conductive strips is pressed into electrical contact with a corresponding lead on the tabs of the gage. The other end of the case is swaged over the termination board to lock the latter in place.
Inventors
- 👤 Seymour Melmelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0051
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A pressure transducer comprising a hollow case that is open at both ends and has an internal shoulder, a diaphragm disposed in said case with one side of the peripheral portion oF said diaphragm engaging said shoulder, annular means engaging the other side of the peripheral portion of said diaphragm, said case having a portion at one end that is bent over said annular means and forces said annular means to clamp said peripheral portion tightly against said shoulder, with a hermetic seal being formed at said shoulder between said diaphragm and said case, a strain gage with at least one electrical resistance element bonded to one side of said diaphragm, and electrical termination means mounted to said case and electrically connected to said at least one electrical resistance element.
Claim 2
Dependent Claim
130 words
A pressure transducer comprising a hollow case that is open at both ends and has an internal shoulder, a diaphragm disposed in said case with one side of the peripheral portion oF said diaphragm engaging said shoulder, annular means engaging the other side of the peripheral portion of said diaphragm, said case having a portion at one end that is bent over said annular means and forces said annular means to clamp said peripheral portion tightly against said shoulder, with a hermetic seal being formed at said shoulder between said diaphragm and said case, a strain gage with at least one electrical resistance element bonded to one side of said diaphragm, and electrical termination means mounted to said case and electrically connected to said at least one electrical resistance element.
Claim 3
Dependent Claim
35 words
A pressure transducer according to claim 1 wherein said electrical termination means comprises a termination board with electrical contact means, said electrical contact means being electrically connected to said at least one electrical resistance element.
Claim 4
Dependent Claim
36 words
A pressure transducer according to claim 2 wherein said strain gage includes electrical leads for said at least one electrical resistance element, and said electrical contact means are held in intimate engagement with said electrical leads.
Claim 5
Dependent Claim
43 words
A pressure transducer according to claim 2 wherein said case has a second internalshoulder and a portion at the opposite end thereof that is bent over the peripheral portion of said termination board and clamps said peripheral portion tightly against said second shoulder.
Claim 6
Dependent Claim
35 words
A pressure transducer according to claim 2 wherein said termination board closes off one end of said case and has at least one passageway for subjecting one side of said diaphragm to a fluid pressure.
Claim 7
Dependent Claim
42 words
A pressure transducer according to claim 1 including a fitting projecting from said case and said annular means comprising an integral part of said fitting, said fitting having a passageway for leading a fluid under pressure to one side of said diaphragm.
Claim 8
Dependent Claim
20 words
A pressure transducer according to claim 6 wherein said fitting is adapted to mount said transducer to a suitable support.
Claim 9
Dependent Claim
63 words
A pressure transducer according to claim 1 wherein said strain gage comprises (1) a plurality of electrical resistance elements arranged in a resistance bridge and bonded to said diaphragm and (2) tab portions with electrical leads connected to said resistance elements, said tab portions extending away from said diaphragm, and said termination means being electrically connected to said resistance elements via said leads.
Claim 10
Dependent Claim
44 words
A pressure transducer according to claim 8 wherein said electrical termination means comprises a termination board with separate electrical contact means for said leads, and further wherein said contact means are clamped to said leads by cooperating portions of said board and said case.
Claim 11
Dependent Claim
46 words
A pressure transducer according to claim 8 wherein said strain gage comprises two tab portions, one at each end of said gage, and further wherein said case has a second internal shoulder and said tab portions are clamped between said second shoulder and said termination board.
Claim 12
Dependent Claim
52 words
A pressure transducer according to claim 10 wherein said strain gage comprises four electrical resistance elements and each of said tab portions comprises two of said leads, and further wherein said termination board comprises four electrical contact means with each contact means being electrically coupled to a different one of said leads.
References Cited (Backward Citations)
US3389362A
Cited
US3793495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |