Patent US5378469A successfully refreshed from Google Patents.
Patent US3791397A successfully refreshed from Google Patents.
US3791397A
Expired / Lapsed
US
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Diaphragm pressure sensor
Assignee: Johnson Service Co
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Filing: 1972-08-30
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Granted: 1974-02-12
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Expires: 1992-08-30
Abstract
Abstract A pressure sensor includes a diaphragm mounted in relatively fixed relationship with respect to an orifice unit interconnected to the end of a threaded pipe. A threaded adjustment nut is provided with an internal thread to receive the pipe member and includes an outer threaded portion which is threaded into a housing. The inner and outer threads of the adjustment nut are of a very slightly different pitch. The threaded pipe is mounted to prevent rotation of the threaded support member while permitting axial movement thereof. Rotation of the adjustment nut results in axial displacement of the threaded pipe and orifice unit with respect to the diaphragm.
Inventors
- 👤 G Janu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:52
CPC Classifications
G; G01; G01L; G01L11/00; G01L11/004; G01L11/006; G01L19/00; G01L19/06; G01L19/0618; Y; Y10; Y10T; Y10T137/00; Y10T137/2278
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
An adjustable leakport pressure sensor employing a leakport means and pressure responsive closure means having a predetermined position relative to the leakport means for opening and closing of the leakport means to establish essentially full pressure and reference pressure, comprising an input chamber means, an orifice unit, a rotatable adjustment member threadedly mounted within the input chamber portion and having a threaded opening aligned with the orifice unit, said orifice unit having a threaded support portion threaded into said threaded opening, the inner threads and outer threads of said adjustment member having slightly different pitches, and means coupled to said orifice unit permitting axial movement of the threaded support portion relative to predetermined position of the closure means and preventing rotation of the threaded support portion to establish a setpoint control of the pressure sensor.
Claim 2
Dependent Claim
135 words
An adjustable leakport pressure sensor employing a leakport means and pressure responsive closure means having a predetermined position relative to the leakport means for opening and closing of the leakport means to establish essentially full pressure and reference pressure, comprising an input chamber means, an orifice unit, a rotatable adjustment member threadedly mounted within the input chamber portion and having a threaded opening aligned with the orifice unit, said orifice unit having a threaded support portion threaded into said threaded opening, the inner threads and outer threads of said adjustment member having slightly different pitches, and means coupled to said orifice unit permitting axial movement of the threaded support portion relative to predetermined position of the closure means and preventing rotation of the threaded support portion to establish a setpoint control of the pressure sensor.
Claim 3
Dependent Claim
23 words
The pressure sensor of claim 1 wherein the difference in said thread pitch is of the order of one thousandths of an inch.
Claim 4
Dependent Claim
22 words
The pressure sensor of claim 1 wherein the difference in said thread pitch is between one and four thousandths of an inch.
Claim 5
Dependent Claim
146 words
An adjustable pressure sensor apparatus comprising a housing member having a flexible diaphragm wall means defining a portion of a control chamber and of an input chamber, an adjustment nut threaded into said housing with an axis normal for said flexible wall means, an adjustment screw threaded into said nut and having an inner nozzle means located within said control chamber with an end orifice in opposed relation to said flexible wall means and opened and closed thereby to establish full pressure and reference pressure in the control chamber in response to slight movement of the wall means, interlock means coupling said nozzle means to said housing and preventing rotation of said screw and having means permitting axial movement of said screw, said adjustment nut including inner and outer threads of slightly different thread pitch to move the nozzle in response to rotation of the nut.
Claim 6
Dependent Claim
146 words
An adjustable pressure sensor apparatus comprising a housing member having a flexible diaphragm wall means defining a portion of a control chamber and of an input chamber, an adjustment nut threaded into said housing with an axis normal for said flexible wall means, an adjustment screw threaded into said nut and having an inner nozzle means located within said control chamber with an end orifice in opposed relation to said flexible wall means and opened and closed thereby to establish full pressure and reference pressure in the control chamber in response to slight movement of the wall means, interlock means coupling said nozzle means to said housing and preventing rotation of said screw and having means permitting axial movement of said screw, said adjustment nut including inner and outer threads of slightly different thread pitch to move the nozzle in response to rotation of the nut.
Claim 7
Dependent Claim
91 words
The pressure sensor of claim 4 wherein said flexible wall means includes a resilient diaphragm of a rubber-like material rigidly clamped about the periphery and with a flat planar sealing face aligned with the orifice, said diaphragm having an essentially zero spring rate in the diaphragm, and a flat spring clamped against said diaphragm between said orifice and said diaphragm, said spring including a center ring portion concentric of said orifice and connected to an outer ring portion by a plurality of spring arms to establish a preselected diaphragm spring rate.
Claim 8
Dependent Claim
22 words
The sensor of claim 5 having a stop wall located in the input chamber in alignment with the center of the diaphragm.
Claim 9
Dependent Claim
117 words
The pressure sensor of claim 4 wherein said flexible wall means includes a resilient diaphragm of a rubber-like material rigidly clamped about the periphery and with a flat planar sealing face aligned with the orifice, said diaphragm having a convolution projecting into the input chamber, said convolution establishing an essentially zero spring rate in the diaphragm, a flat spring clamped against said diaphragm between said orifice and said diaphragm, said spring including a center ring portion concentric of said orifice and connected to an outer ring portion by a plurality of spring arms to establish a preselected diaphragm spring rate, and a stop wall located in the input chamber in alignment with the center of the diaphragm.
Claim 10
Dependent Claim
51 words
The sensor apparatus of claim 4 having a regulated fluid supply means connected to establish flow through said orifice in accordance with the position of said wall, and a load connection means connected to said orifice to respond to the back pressure resulting from the position of the diaphragm wall means.
Claim 11
Dependent Claim
107 words
The pressure sensor of claim 4 wherein said housing includes a control member having a central threaded opening to receive said nut and a recess in one end defining said control chamber with a sidewall connecting passageway to said control chamber, an intermediate section connecting said control chamber to the threaded opening, said screw having a smooth shaft portion aligned with said intermediate section, a seal rotatably sealing the section about the shaft portion, said nozzle and interlock means including a plurality of axial notches and mating projections extending into said notches, said notches being longer than said projections to permit said axial movement of said screw.
Claim 12
Dependent Claim
122 words
The pressure sensor of claim 4 wherein said housing includes a control member having a central threaded opening to receive said nut and a recess in one end defining said control chamber with a sidewall connecting passageway to said control chamber, a reduced throat section connecting said control chamber to the threaded opening, said screw having a smooth shaft portion aligned with said throat section, an O-ring seal rotatably sealing the throat section about the shaft portion, said enlarged nozzle having a plurality of outer axial peripheral notches, and said interlock means including selected notches less than all of said notches and a ring member attached to the adjacent wall of the control chamber with interlock projections extending into said selected notches.
Claim 13
Dependent Claim
117 words
An adjustable set point pressure sensor employing a leakport means a pressure responsive closure means for variably opening and closing of the leakport means, comprising a input chamber means, an orifice unit, a housing for said orifice unit, means to mount said closure means in said input chamber to establish a relatively fixed position relative to said housing, and movable adjustment means connected to said orifice unit and movable axially of the orifice unit and repositioning of the orifice unit without rotation of said orifice unit in response to movement of the adjustment means and axially adjusting the position of the orifice unit accurately with respect to said housing to adjust the set point of the sensor.
Claim 14
Dependent Claim
117 words
An adjustable set point pressure sensor employing a leakport means a pressure responsive closure means for variably opening and closing of the leakport means, comprising a input chamber means, an orifice unit, a housing for said orifice unit, means to mount said closure means in said input chamber to establish a relatively fixed position relative to said housing, and movable adjustment means connected to said orifice unit and movable axially of the orifice unit and repositioning of the orifice unit without rotation of said orifice unit in response to movement of the adjustment means and axially adjusting the position of the orifice unit accurately with respect to said housing to adjust the set point of the sensor.
Claim 15
Dependent Claim
44 words
The adjustable set point pressure sensor of claim 1 wherein said closure means includes a convoluted flexible diaphragm wall means having an essential zero spring rate and a flat web spring having its lowest spring rate at the unstressed mid-position of the closure means.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |