US3575054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensing device
Assignee: RTX Corp
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Filing: 1969-03-12
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Granted: 1971-04-13
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Expires: 1989-03-12
Abstract
Abstract A bellows chamber has directly connected thereto a restoring force coil and Hall field plate position sensing devices which utilize the same DC magnetism as the restoring force coil. DC magnetism may be provided by an annular permanent magnet, and the pressure responsive bellows may be disposed in the annulus of the magnet. One or more Hall devices may be disposed directly on the restoring force coil. In another embodiment, a pair of pressures may be monitored in a device having a bellows chamber for each pressure, the restoring force coil, sensor and magnet relating to one of said bellows being disposed adjacent the other of said bellows, with linkage interconnecting each bellows with corresponding force restoring and sensing devices, thereby providing for mechanical advantage between the force applied by the coil and the force applied to the bellows, so as to reduce the magnetic field requirements and thus the physical size of the device, for a given pressure. In another embodiment, the magnet, restoring coil and sensors may be disposed at the moveable end of a bellows chamber, opposite the pressure inlet. In another embodiment of the invention, a diaphragm may be utilized to define a chamber having a wall displaceable by pressure differentials thereacross, instead of a bellows chamber.
Inventors
- 👤 Edward M Glista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:44
CPC Classifications
G; G01; G01L; G01L13/00; G01L13/02; G01L13/023; G01L11/00; G01L11/004; G01L11/008
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
202 words
A pressure sensOr comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux, said source of flux comprising a permanent magnet having a generally annular shape, said chamber being disposed within the annulus of said magnet; restoring force means disposed directly on said moveable wall, said restoring force means comprising an electrical coil disposed adjacent said source and within said flux, the current through which is an indication of the force required to maintain said wall in an equilibrium position in opposition to contra forces resulting from changes in the pressure within said chamber; position sensing means connected to said wall and operative to provide an indication of displacement of said wall away from a null position, said sensing means comprising a Hall field plate disposed adjacent said source and within said flux; and means responsive to said position sensing means and connected to said restoring force means to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 2
Dependent Claim
202 words
A pressure sensOr comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux, said source of flux comprising a permanent magnet having a generally annular shape, said chamber being disposed within the annulus of said magnet; restoring force means disposed directly on said moveable wall, said restoring force means comprising an electrical coil disposed adjacent said source and within said flux, the current through which is an indication of the force required to maintain said wall in an equilibrium position in opposition to contra forces resulting from changes in the pressure within said chamber; position sensing means connected to said wall and operative to provide an indication of displacement of said wall away from a null position, said sensing means comprising a Hall field plate disposed adjacent said source and within said flux; and means responsive to said position sensing means and connected to said restoring force means to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 3
Dependent Claim
165 words
A pressure sensor comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux; restoring force means comprising an electrical coil disposed adjacent said source and within said flux, the current through which is an indication of the force required to maintain said wall in an equilibrium position in opposition to contra forces resulting from the pressure within said chamber; position sensing means connected to said wall and disposed adjacent said source and within said flux, said sensing means responsive to said flux to provide an indication of displacement of said wall away from a null position; and means responsive to said position sensing means and connected to said restoring force means to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 4
Dependent Claim
165 words
A pressure sensor comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux; restoring force means comprising an electrical coil disposed adjacent said source and within said flux, the current through which is an indication of the force required to maintain said wall in an equilibrium position in opposition to contra forces resulting from the pressure within said chamber; position sensing means connected to said wall and disposed adjacent said source and within said flux, said sensing means responsive to said flux to provide an indication of displacement of said wall away from a null position; and means responsive to said position sensing means and connected to said restoring force means to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 5
Dependent Claim
177 words
A pressure sensor comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux, said source of flux comprising a magnetic structure having a generally annular shape, said chamber being disposed within the annulus of said magnetic structure; restoring force means comprising an electrical coil disposed adjacent said source and within said flux, the current through which is an indication of the force required to maintain said wall in an equilibrium position in opposition to contra forces resulting from changes in the pressure within said chamber; position sensing means connected to said wall and operative to provide an indication of displacement of said wall away from a null position; and means responsive to said position sensing means and connected to said restoring force means to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 6
Dependent Claim
177 words
A pressure sensor comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux, said source of flux comprising a magnetic structure having a generally annular shape, said chamber being disposed within the annulus of said magnetic structure; restoring force means comprising an electrical coil disposed adjacent said source and within said flux, the current through which is an indication of the force required to maintain said wall in an equilibrium position in opposition to contra forces resulting from changes in the pressure within said chamber; position sensing means connected to said wall and operative to provide an indication of displacement of said wall away from a null position; and means responsive to said position sensing means and connected to said restoring force means to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 7
Dependent Claim
193 words
A pressure sensor comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux, said source of flux comprising a magnetic structure having a generally annular shape, said chamber being disposed within the annulus of said magnetic structure; electric restoring force means for maintaining said wall in an equilibrium position in Opposition to contra forces resulting from changes in the pressure within said chamber, said electric restoring force means being mounted on said wall and cooperating with said magnetic flux; position sensing means connected to said wall and disposed adjacent said source and within said flux, and operative to provide an electric signal indication of displacement of said wall away from a null position in response to said flux; and electric means responsive to said position sensing means and connected to said restoring force means to provide an electric signal to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 8
Dependent Claim
193 words
A pressure sensor comprising: a chamber adapted to be in fluid communication with fluid, the pressure of which is to be indicated by said pressure sensor, said chamber having a wall displaceable in response to variations in pressure within said chamber; a source of time-invariant magnetic flux, said source of flux comprising a magnetic structure having a generally annular shape, said chamber being disposed within the annulus of said magnetic structure; electric restoring force means for maintaining said wall in an equilibrium position in Opposition to contra forces resulting from changes in the pressure within said chamber, said electric restoring force means being mounted on said wall and cooperating with said magnetic flux; position sensing means connected to said wall and disposed adjacent said source and within said flux, and operative to provide an electric signal indication of displacement of said wall away from a null position in response to said flux; and electric means responsive to said position sensing means and connected to said restoring force means to provide an electric signal to cause said restoring force means to balance the force applied to said wall by the pressure in said chamber.
Claim 9
Dependent Claim
253 words
A pressure sensor comprising: a plurality of chambers adapted to be in fluid communication with respective sources of fluid, the pressure of which is to be indicated by said pressure sensor, each of said chambers having a wall displaceable in response to variations in pressure within said chamber; a plurality of sources of time-invariant magnetic flux, each of said sources of flux comprising a magnetic structure having a generally annular shape, each of said chambers being disposed within the annulus of one of said magnetic structures; a plurality of restoring force means, each connected to the displaceable wall of a related one of said chambers, each restoring force means comprising an electrical coil disposed adjacent to and within the flux of one of said sources other than the one in which the corresponding one of said walls is disposed, the current through which is an indication of the force required to maintain the related wall in an equilibrium position in opposition to contra forces resulting from changes in the pressure within the related chamber; a plurality of position sensing means, one connected to each of said displaceable walls and operative to provide an indication of displacement of said wall away from a null position; and a plurality of means, each responsive to a related one of said position sensing means and connected to a corresponding one of said restoring force means to cause said restoring force means to balance the force applied to the related wall by the pressure in the related chamber.
Claim 10
Dependent Claim
253 words
A pressure sensor comprising: a plurality of chambers adapted to be in fluid communication with respective sources of fluid, the pressure of which is to be indicated by said pressure sensor, each of said chambers having a wall displaceable in response to variations in pressure within said chamber; a plurality of sources of time-invariant magnetic flux, each of said sources of flux comprising a magnetic structure having a generally annular shape, each of said chambers being disposed within the annulus of one of said magnetic structures; a plurality of restoring force means, each connected to the displaceable wall of a related one of said chambers, each restoring force means comprising an electrical coil disposed adjacent to and within the flux of one of said sources other than the one in which the corresponding one of said walls is disposed, the current through which is an indication of the force required to maintain the related wall in an equilibrium position in opposition to contra forces resulting from changes in the pressure within the related chamber; a plurality of position sensing means, one connected to each of said displaceable walls and operative to provide an indication of displacement of said wall away from a null position; and a plurality of means, each responsive to a related one of said position sensing means and connected to a corresponding one of said restoring force means to cause said restoring force means to balance the force applied to the related wall by the pressure in the related chamber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |