US3744316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra-low fluid pressure and ultra-low force measuring apparatus
Assignee: Honeywell Inc
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Filing: 1971-08-26
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Granted: 1973-07-10
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Expires: 1991-08-26
Abstract
Abstract An ultra-low fluid pressure and force measuring apparatus whose accuracy is limited only by the friction introduced by a substantially frictionless hydrodynamic air bearing formed between an inside of a cylinder and an outer surface of a piston against one or both ends of which a pressure or force under measurement is applied. Capacitor plates mounted on the cylinder and moveable piston form a sensor for a force balanced capacitance feedback circuit which in turn transmits an electrical signal to: No. 1. an indicator to show the degree of displacement of the piston due to the difference in magnitude of the apposing fluid pressures or forces acting on the piston and No. 2. to a stator that surrounds an armature within said piston to rotate same and to apply an axial rebalancing magnetic force thereto.
Inventors
- 👤 R Kuzyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:33
CPC Classifications
G; G01; G01L; G01L11/00; G01L11/004; G01L11/008; G01L21/00; G01L21/16; G01L21/24; G01L9/00; G01L9/0001; G01L9/0005; G01L9/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
An apparatus to measure the magnitude of a variable that is of an ultra-low magnitude, comprising a chamber, a member having a longitudinal axis mounted for rotary movement about the axis and longitudinal displacement on a hydrodynamic air bearing in said chamber, means for applying said variable to effect said displacement of said member in said chamber, means for rotating said member and applying force to oppose said movement, a sensor associated with said member in a wall of the chamber to convert said displacement into an electrical signal which is linearly proportional to the displacement, a force balance feed-back circuit operably connected to receive said signal from the sensing means and to simultaneously transmit an output signal to an indicator to indicate the magnitude of said variable thereon and a feedback signal to said means for rotating.
Claim 2
Independent Claim
138 words
An apparatus to measure the magnitude of a variable that is of an ultra-low magnitude, comprising a chamber, a member having a longitudinal axis mounted for rotary movement about the axis and longitudinal displacement on a hydrodynamic air bearing in said chamber, means for applying said variable to effect said displacement of said member in said chamber, means for rotating said member and applying force to oppose said movement, a sensor associated with said member in a wall of the chamber to convert said displacement into an electrical signal which is linearly proportional to the displacement, a force balance feed-back circuit operably connected to receive said signal from the sensing means and to simultaneously transmit an output signal to an indicator to indicate the magnitude of said variable thereon and a feedback signal to said means for rotating.
Claim 3
Dependent Claim
37 words
The apparatus as defined in claim 1 wherein the member is a piston, the chamber is a cylinder and the variable is a pressure signal which is adapted to be applied to one end of the piston.
Claim 4
Dependent Claim
47 words
The apparatus as defined in claim 1 wherein the member is a piston, the chamber is a cylinder and the variable is a forcE resulting from a difference in the pressure of two fluids each one of which is applied to a different end of the piston.
Claim 5
Dependent Claim
36 words
The apparatus as defined in claim 1 wherein the member is a piston, the chamber is a cylinder and the variable is a force which is adapted to be applied to one end of the piston.
Claim 6
Dependent Claim
37 words
The apparatus as defined in claim 1 wherein the member is a piston, the chamber is a cylinder and the variable is an expandable gas which is adapted to be applied to one end of the piston.
Claim 7
Dependent Claim
58 words
The apparatus as defined in claim 1 wherein the member is a piston, the chamber is a cylinder and the variable is a force resulting from a difference in expansion of two fixed volumes of gases each one of which is applied to a different end of the piston and which are each subject to a different temperature.
Claim 8
Dependent Claim
33 words
The apparatus as defined in claim 1 wherein the means for rotating said member is a stator and said stator is aligned with an armature which forms an integral part of said member.
Claim 9
Dependent Claim
15 words
The apparatus as defined in claim 1 wherein the sensing means is a variable capacitor.
Claim 10
Dependent Claim
51 words
The apparatus as defined in claim 1 wherein the member is a piston and the chamber is a cylindrical sleeve, the sensing means is a variable capacitor comprised of a conductive band extending about said piston and spaced apart arcuate shaped metallic coatings on the inner wall of said cylindrical sleeve.
Claim 11
Dependent Claim
69 words
The apparatus as defined in claim 1 wherein the means employed for rotating said member is a stator which transmits magnetic forces to an armature position in said member and wherein the magnetic forces which the stator applies to the armature in the piston is of a value that is equal to and in a direct opposite direction from the force being applied by said variable to said piston.
References Cited (Backward Citations)
US3383922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |