Patent US5212989A successfully refreshed from Google Patents.
US5212989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensor
Assignee: Mitsubishi Electric Corp
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Filing: 1991-06-06
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Granted: 1993-05-25
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Expires: 2011-06-06
Abstract
Abstract A pressure sensor comprising a hollow main body (11) defining a bore (14) extending therethrough and having a detection end and an output end. A pressure sensing assembly is disposed within said bore (14) to divide it into a detection cavity (17) and an output cavity (18) through which output signal lines from said pressure sensing assembly extend. A flexible diaphragm (19) is attached to the detection end of the bore to define a sealed detection cavity (17) in which a pressure transmitting liquid is filled. The pressure sensing assembly comprises support plate (24) welded to said main body (11) and supporting a pressure sensing element (26) within said detection cavity (17) through a mounting bed (4). The signal lines sealingly extend through said support plate (24) from said detection cavity (17) to said output cavity (18).
Inventors
- 👤 Seiki Kodama
- 👤 Atsushi Ueda
- 👤 Toshio Iwata
- 👤 Yasuo Tada
- 👤 Tateki Mitani
- 👤 Yasuyoshi Hatazawa
- 👤 Mikio Bessho
- 👤 Yuji Hase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:23
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/08; G01L19/00; G01L19/14; G01L19/141; G01L19/0007; G01L19/0038; G01L19/0061; G01L19/0084; G01L19/06; G01L19/0627; G01L19/0645
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
146 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; and a pressure transmitting medium filled within said detection cavity; said detection end of said bore, along which said flexible diaphragm is bent when it is subjected to a pressure, being substantially cone-shaped to exhibit a shallow slope, bevelled edge surface for moderating concentration of bending of said diaphragm.
Claim 2
Dependent Claim
146 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; and a pressure transmitting medium filled within said detection cavity; said detection end of said bore, along which said flexible diaphragm is bent when it is subjected to a pressure, being substantially cone-shaped to exhibit a shallow slope, bevelled edge surface for moderating concentration of bending of said diaphragm.
Claim 3
Dependent Claim
51 words
A pressure detector as claimed in claim 1, wherein said detection cavity has a first chamber for receiving therein said pressure sensing assembly, a second chamber for allowing flexture of said flexible diaphragm in response to pressure acting thereupon, and a reduced diameter fluid passage communicating said first and second chambers.
Claim 4
Dependent Claim
139 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; a pressure transmitting medium filled within said detection cavity; and means disposed within said detection cavity for decreasing the volume of said detection cavity, wherein said means for decreasing volume of said detection cavity comprises a tube inserted within said detection chamber.
Claim 5
Dependent Claim
139 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; a pressure transmitting medium filled within said detection cavity; and means disposed within said detection cavity for decreasing the volume of said detection cavity, wherein said means for decreasing volume of said detection cavity comprises a tube inserted within said detection chamber.
Claim 6
Dependent Claim
58 words
A pressure sensor as claimed in claim 3, wherein said detection cavity includes a first chamber for receiving therein said pressure sensing assembly, a second chamber for allowing flexture of said flexible diaphragm in response to pressure acting thereupon, and a reduced-diameter passage fluid communicating said first and second chambers, said reduced-diameter passage being defined by said tube.
Claim 7
Dependent Claim
144 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a pressure transmitting medium filled within said detection cavity; and means disposed within said detection cavity for decreasing the volume of said detection cavity, wherein said means for decreasing the volume of said detection cavity comprises a volume of a thermally-contracting material having a negative coefficient of thermal expansion for absorbing thermal expansion of said pressure transmitting medium, said thermally-contracting material comprising an alloy of iron and platinum.
Claim 8
Dependent Claim
144 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a pressure transmitting medium filled within said detection cavity; and means disposed within said detection cavity for decreasing the volume of said detection cavity, wherein said means for decreasing the volume of said detection cavity comprises a volume of a thermally-contracting material having a negative coefficient of thermal expansion for absorbing thermal expansion of said pressure transmitting medium, said thermally-contracting material comprising an alloy of iron and platinum.
Claim 9
Dependent Claim
136 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; a pressure transmitting medium filled within said detection cavity; and mechanical adjusting means movably disposed in said main body for mechanically adjusting a volume of said detection cavity to eliminate a bias pressure developed in said pressure transmitting medium.
Claim 10
Dependent Claim
136 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; a pressure transmitting medium filled within said detection cavity; and mechanical adjusting means movably disposed in said main body for mechanically adjusting a volume of said detection cavity to eliminate a bias pressure developed in said pressure transmitting medium.
Claim 11
Dependent Claim
50 words
A pressure sensor as claimed in claim 6, wherein said adjusting means comprises a threaded hole formed in a main body and communicating with said detecting cavity and an adjusting screw threadably-engaged with said threaded hole, said adjusting screw changing the axial position thereof in said threaded hole when turned.
Claim 12
Dependent Claim
34 words
A pressure sensor as claimed in claim 7, wherein said threaded hole includes a large-diameter cylinder concentric to said threaded hole, and said adjusting screw includes an adjusting piston slidably engaging said large-diameter cylinder.
Claim 13
Dependent Claim
154 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; a pressure transmitting medium filled within said detection cavity; and a ring shaped spacer secured to an interior circumferential wall of said detection cavity for decreasing a volume of said detection cavity, wherein said ring shaped spacer comprises a thermally-contracting material having a negative coefficient of thermal expansion for absorbing thermal expansion of said pressure transmitting medium.
Claim 14
Dependent Claim
154 words
A pressure sensor comprising: a hollow main body defining a bore extending therethrough and having a detection end and an output end; a pressure sensing assembly disposed within said bore of said main body and dividing said bore into a detection cavity including said detection end for transmitting therethrough the pressure to be detected and an output cavity including said output end through which an output signal from said pressure sensing assembly is to be supplied; a flexible diaphragm attached to said main body at said detection end of said detection cavity for sealing said detection cavity; a pressure transmitting medium filled within said detection cavity; and a ring shaped spacer secured to an interior circumferential wall of said detection cavity for decreasing a volume of said detection cavity, wherein said ring shaped spacer comprises a thermally-contracting material having a negative coefficient of thermal expansion for absorbing thermal expansion of said pressure transmitting medium.
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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |