Patent US3831431A successfully refreshed from Google Patents.
US3831431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable static pressure or vacuum source and indicator
Assignee: Individual
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Filing: 1973-05-11
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Granted: 1974-08-27
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Expires: 1993-05-11
Abstract
Abstract Device and method for checking and calibrating vacuum and low pressure pneumatic gauges and differential pressure switches by utilizing a helix of tubing partially filled with a liquid and then rotated about its axis to a new position as a readily adjustable, highly accurate, constant source of vacuum or low pressure.
Inventors
- 👤 B Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:08
CPC Classifications
G; G01; G01L; G01L27/00; G01L27/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
199 words
Static pressure-source device for providing a constant source of static positive or negative pressure in a given position thereof when connected to external devices, comprising: a helix of tubing having more than one turn, partially filled with a liquid; portion rotational mounting means for rotatably mounting said helix of tubing with its axis substantially horizontal, whereby rotation of said helix of tubing about its axis from an original position to the given position moves said liquid to a corresponding position within said helix of tubing, thereby tending, when connected to an external device such that the tubing is closed to atmosphere between the liquid therein and the external device, to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the original position of said liquid, and a positive pressure within that non-liquid-filled prtion of said helix of tubing which adjoins the new position of said liquid corresponding to said given position of said helix of tubing; connection means adapted for the introduction of a liquid, at a first end of said helix of tubing; and external connection means adapted for connection to external devices, at the other end of said helix of tubing.
Claim 2
Dependent Claim
199 words
Static pressure-source device for providing a constant source of static positive or negative pressure in a given position thereof when connected to external devices, comprising: a helix of tubing having more than one turn, partially filled with a liquid; portion rotational mounting means for rotatably mounting said helix of tubing with its axis substantially horizontal, whereby rotation of said helix of tubing about its axis from an original position to the given position moves said liquid to a corresponding position within said helix of tubing, thereby tending, when connected to an external device such that the tubing is closed to atmosphere between the liquid therein and the external device, to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the original position of said liquid, and a positive pressure within that non-liquid-filled prtion of said helix of tubing which adjoins the new position of said liquid corresponding to said given position of said helix of tubing; connection means adapted for the introduction of a liquid, at a first end of said helix of tubing; and external connection means adapted for connection to external devices, at the other end of said helix of tubing.
Claim 3
Dependent Claim
12 words
Device according to claim 1 wherein said helix of tubing is transparent.
Claim 4
Dependent Claim
17 words
Device according to claim 1 wherein the number of turns of said helix of tubing is two.
Claim 5
Dependent Claim
19 words
Device according to claim 1 comprising in addition a differential level indicator scale rotatably affixed to said mounting means.
Claim 6
Dependent Claim
180 words
Fluid pressure-indicator calibrating device for calibrating uncalibrated fluid pressure indicators, comprising: a helix of tubing having more than One turn, said helix of tubing being partially filled with a liquid; rotational mounting means for rotatably mounting said helIx of tubing with its axis substantially horizontal, whereby rotation of said helix of tubing about its axis to a new position moves said liquid to a corresponding new position within said helix of tubing, thereby tending to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the old position of said liquid, and a positive pressure within that non-liquid-filled portion of said helix of tubing which adjoins the new position of said liquid; a calibrated fluid pressure indicator; connection means adapted for the introduction of a liquid, at a first end of said helix of tubing; connecting tubing to said calibrated fluid pressure indicator, from the other end of said helix of tubing; and connecting tubing to an uncalibrated fluid pressure indicator, which is to be calibrated, from said other end of said helix of tubing.
Claim 7
Dependent Claim
180 words
Fluid pressure-indicator calibrating device for calibrating uncalibrated fluid pressure indicators, comprising: a helix of tubing having more than One turn, said helix of tubing being partially filled with a liquid; rotational mounting means for rotatably mounting said helIx of tubing with its axis substantially horizontal, whereby rotation of said helix of tubing about its axis to a new position moves said liquid to a corresponding new position within said helix of tubing, thereby tending to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the old position of said liquid, and a positive pressure within that non-liquid-filled portion of said helix of tubing which adjoins the new position of said liquid; a calibrated fluid pressure indicator; connection means adapted for the introduction of a liquid, at a first end of said helix of tubing; connecting tubing to said calibrated fluid pressure indicator, from the other end of said helix of tubing; and connecting tubing to an uncalibrated fluid pressure indicator, which is to be calibrated, from said other end of said helix of tubing.
Claim 8
Dependent Claim
13 words
Device according to claim 5 wherein said calibrated pressure indicator is a manometer.
Claim 9
Dependent Claim
72 words
Device according to claim 6 wherein: said helix of tubing is transparent; the number of turns of said helix of tubing is two; said rotational mounting means is a shallow cylindrical shell; and further comprising: a pedestal supporting said shallow cylindrical shell; a bearing on said shallow cylindrical shell adapted to allow moderate manual frictional rotation of said shell; and a differential level indicator scale rotatably affixed to said shallow cylindrical shell.
Claim 10
Dependent Claim
171 words
Method of calibrating fluid pressure indicators comprising the steps of: connecting to both a calibrated pressure indicator and to an uncalibrated pressure indicator the same end of a helix of tubing, rotatably mounted with its axis substantially horizontal, having more than one turn, partially filled with a liquid, the other end of the helix being vented to ambient atmosphere, whereby rotation of said helix of tubing about its axis to a new position moves said liquid to a new position within said helix of tubing, thereby tending to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the old position of said liquid, and a positive pressure within that non-liquid-filled portion Of said helix of tubing which adjoins the new position of said liquid; rotating said helix of tubing about its axis to a new position thereby producing an identical pressure on both the calibrated and uncalibrated pressure indicators; and then adjusting the uncalibrated pressure indicator to read the same as the calibrated pressure indicator.
Claim 11
Dependent Claim
171 words
Method of calibrating fluid pressure indicators comprising the steps of: connecting to both a calibrated pressure indicator and to an uncalibrated pressure indicator the same end of a helix of tubing, rotatably mounted with its axis substantially horizontal, having more than one turn, partially filled with a liquid, the other end of the helix being vented to ambient atmosphere, whereby rotation of said helix of tubing about its axis to a new position moves said liquid to a new position within said helix of tubing, thereby tending to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the old position of said liquid, and a positive pressure within that non-liquid-filled portion Of said helix of tubing which adjoins the new position of said liquid; rotating said helix of tubing about its axis to a new position thereby producing an identical pressure on both the calibrated and uncalibrated pressure indicators; and then adjusting the uncalibrated pressure indicator to read the same as the calibrated pressure indicator.
Claim 12
Dependent Claim
193 words
Method of providing a contant source of static positive or negative pressure to external devices, comprising the steps of: filling partially with a liquid from a first end a helix of tubing having more than one turn; mounting with its axis substantially horizontal said helix of tubing so as to permit rotation about its axis, whereby rotation of said helix of tubing about its axis to a new position moves said liquid to a new position within said helix of tubing, thereby tending to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the old position of said liquid, and a positive pressure within that non-liquid-filled portion of said helix of tubing which adjoins the new position of said liquid when connected to an external device such that the tubing is closed to atmosphere between the liquid therein and the external device; connecting the other end of said helix of tubing to an external device; and then rotating said helix of tubing about its axis to a new fixed position and maintaining such new position thereby communicating a constant source of static pressure to said external device.
Claim 13
Dependent Claim
193 words
Method of providing a contant source of static positive or negative pressure to external devices, comprising the steps of: filling partially with a liquid from a first end a helix of tubing having more than one turn; mounting with its axis substantially horizontal said helix of tubing so as to permit rotation about its axis, whereby rotation of said helix of tubing about its axis to a new position moves said liquid to a new position within said helix of tubing, thereby tending to produce a negative pressure within that non-liquid-filled portion of said helix of tubing which adjoins the old position of said liquid, and a positive pressure within that non-liquid-filled portion of said helix of tubing which adjoins the new position of said liquid when connected to an external device such that the tubing is closed to atmosphere between the liquid therein and the external device; connecting the other end of said helix of tubing to an external device; and then rotating said helix of tubing about its axis to a new fixed position and maintaining such new position thereby communicating a constant source of static pressure to said external device.
References Cited (Backward Citations)
DE749525C
Cited
US2370095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |