US4158311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensing device
Assignee: Fuji Electric Co Ltd
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Filing: 1978-06-06
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Granted: 1979-06-19
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Expires: 1998-06-06
Abstract
Abstract A compact sensing device is provided which the tension applied to the sensing member is substantially uniform and free of thermally changing. Either the sensing member itself or a clamping member disposed around the device or both, are made of a precipitation hardenable metal which will contract during a heat treatment. If the sensing member is thermally contracted a uniform radial tension will result, and if the clamping member is contracted a uniform clamping force applied to the device for tensioning the diaphragm will be provided without the necessity of clamping bolts.
Inventors
- 👤 Takeshi Yasuhara
- 👤 Mitsuru Tamai
- 👤 Tadanori Yuhara
- 👤 Isamu Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:05
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/0038; G01L; G01L9/00; G01L9/0041; G01L9/0042; G01L9/0044; G01L9/0072
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
109 words
In a pressure measuring device of the type in which a flexible sensing member is disposed between first and second housing members and the amount of movement of said sensing member is indicative of the magnitude of a pressure applied thereto, said device further including a fixing member disposed around the periphery of said housing members, the improvement comprising: at least one of said sensing and fixing members being made of a precipitation hardenable metal contracted by a heat treatment process, said one of said members being under stress as a result of having been first secured to said housing members and then subjected to said heat treatment process.
Claim 2
Dependent Claim
109 words
In a pressure measuring device of the type in which a flexible sensing member is disposed between first and second housing members and the amount of movement of said sensing member is indicative of the magnitude of a pressure applied thereto, said device further including a fixing member disposed around the periphery of said housing members, the improvement comprising: at least one of said sensing and fixing members being made of a precipitation hardenable metal contracted by a heat treatment process, said one of said members being under stress as a result of having been first secured to said housing members and then subjected to said heat treatment process.
Claim 3
Dependent Claim
57 words
A pressure measuring device according to claim 1, wherein a space is formed between said housing members and is separated into first and second pressure receiving chambers by said sensing member which comprises a highly flexible sensing diaphragm so that the movement of said sensing diaphragm is indicative of the difference between the pressures in said chambers.
Claim 4
Dependent Claim
17 words
A pressure measuring device according to claim 2, wherein one of said chambers contains a reference pressure.
Claim 5
Dependent Claim
25 words
A pressure measuring device according to claim 3, wherein said fixing member comprises a plurality of plates spaced around the periphery of said housing members.
Claim 6
Dependent Claim
15 words
A pressure measuring device according to claim 3, wherein said fixing member is substantially cylindrical.
Claim 7
Dependent Claim
29 words
A pressure measuring device according to claims 2 or 3, wherein said sensing member is made of said precipitation hardenable material and said stress is a uniform radial tension.
Claim 8
Dependent Claim
44 words
A pressure measuring device according to claim 6, wherein said precipitation hardenable metal is composed of: Ni, 36 wt%; Cr, 12 wt%; Mn, 1 to 2 wt%; W, 1 to 3 wt%; Si, 1 to 2 wt%; C, 0.8 wt%; and the remainder Fe.
Claim 9
Dependent Claim
44 words
A pressure measuring device according to claim 6, wherein said precipitation hardenable material is composed of: Co, 40 wt%; Ni, 26 wt%; Cr, 12 wt%; Mo, 4 wt%; W, 4 wt%; Ti, 1 wt%; Mn, 1.4 wt%; Be, 0.2 wt%; and the remainder Fe.
Claim 10
Dependent Claim
39 words
A pressure measuring device according to claim 6, wherein said precipitation hardenable material comprises: Co, 40 wt%; Ni, 15 wt%; Cr, 20 wt%; Mo, 7 wt%; Mn, 2 wt%; Be, 0.04 wt%; C, 0.15 wt%; and the remainder Fe.
Claim 11
Dependent Claim
42 words
A pressure measuring device according to claim 6, wherein said precipitation hardenable mateiral comprises: Ni, 42 wt%; Cr, 5.3 wt%; Mn, 0.5 wt%; Si, 0.3 wt%; Ti, 2.4 wt%; Al, 0.4 wt%; Cu, 0.05 wt%; C, 0.02 wt%; and the remainder Fe.
Claim 12
Dependent Claim
42 words
A pressure measuring device according to claim 6, wherein said precipitation hardenable material comprises: Co, 40 wt%; Ni, 15 wt%; Cr, 20 wt%; Mo, 7 wt%; Mn, 1.5 wt%; Si, 0.45 wt%; Be, 0.05 wt%; Cu, 0.15 wt%; and the remainder Fe.
Claim 13
Dependent Claim
49 words
A pressure measuring device according to claim 1, further comprising: float means disposed on a body of liquid; connecting means for mechanically connecting said float means to said sensing member so that a mechanical pressure corresponding to the level of said liquid will be exerted on said sensing member.
Claim 14
Dependent Claim
16 words
A pressure measuring device according to claim 12, wherein said fixing member includes an axial gap.
Claim 15
Dependent Claim
34 words
A pressure measuring device according to claims 2, 3 or 1, wherein said fixing member is made of said precipitation hardenable material and said stress is a compressive force exerted on said housing members.
Claim 16
Dependent Claim
44 words
A pressure measuring device according to claim 14, wherein said precipitation hardenable metal is composed of: Ni, 36 wt%; Cr, 12 wt%; Mn, 1 to 2 wt%; W, 1 to 3 wt%; Si, 1 to 2 wt%; C, 0.8 wt%; and the remainder Fe.
Claim 17
Dependent Claim
44 words
A pressure measuring device according to claim 14, wherein said precipitation hardenable material is composed of: Co, 40 wt%; Ni, 26 wt%; Cr, 12 wt%; Mo, 4 wt%; W, 4 wt%; Ti, 1 wt%; Mn, 1.4 wt%; Be, 0.2 wt%; and the remainder Fe.
Claim 18
Dependent Claim
42 words
A pressure measuring device according to claim 14, wherein said precipitation hardenable material comprises: Ni, 42 wt%; Cr, 5.3 wt%; Mn, 0.5 wt%; Si, 0.3 wt%; Ti, 2.4 wt%; Al, 0.4 wt%; Cu, 0.05 wt%; C, 0.02 wt%; and the remainder Fe.
Claim 19
Dependent Claim
39 words
A pressure measuring device according to claim 14, wherein said precipitation hardenable material comprises: Co, 40 wt%; Ni, 15 wt%; Cr, 20 wt%; Mo, 7 wt%; Mn, 2 wt%; Be, 0.04 wt%; C, 0.15 wt%; and the remainder Fe.
Claim 20
Dependent Claim
42 words
A pressure measuring device according to claim 14, wherein said precipitation hardenable material comprises: Co, 40 wt%; Ni, 15 wt%; Cr, 20 wt%; Mo, 7 wt%; Mn, 1.5 wt%; Si, 0.45 wt%; Be, 0.05 wt%; Cu, 0.15 wt%; and the remainder Fe.
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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |