US3869920A — Symmetrically arranged, deflection type different…

Claim 1

Independent Claim 338 words

A differential pressure transmitter for controlling fluid flow rate and other parameters which can be related to a pressure differential in industrial systems and processes, comprising: housing means; pressure responsive means including two diaphragm members mounted in generally parallel, spaced relation in said housing means and being symmetrical when in their rest position about an axis of symmetry extending perpendicularly to the diaphragm axis; connecting means for linking said diaphragm members together at their centers; and a spring rod mechanism comprising a rod element for transmitting movement of said connecting means out through the pressure responsive means to permit sensing thereof, said rod element being secured at a first portion to said connecting means; support means pivotally mounting at least one end of said rod element with respect to said housing means; said rod element having at least one second portion thereof constructed and arranged to provide for bending thereof about the longitudinal axis of said rod element as said connecting means moves with said diaphragm members; an extension member secured to said one end of said rod element to effect angular movement in response to bending movement of said second rod element portion so as to transmit such movement beyond said pressure responsive means; a high pressure receiving chamber located in said housing means to communicate with one of said diaphragm members; a low pressure receiving chamber located in said housing means to communicate with the opposite diaphragm member; means for detecting displacement and converting displacement into an output response mounted above said pressure responsive means and including means responsive to the angular movement of the outer end of said extension member whereby a pressure differential created between said high and low pressure receiving chamber produces a resulting force which causes both diaphragm members to deform, transversely displacing said connecting means and axially bending said second rod element portion to angularly displace said rod extension member, the movement of the rod extention member being detected and converted to an output response by said detecting and converting means.

Claim 2

Dependent Claim 338 words

A differential pressure transmitter for controlling fluid flow rate and other parameters which can be related to a pressure differential in industrial systems and processes, comprising: housing means; pressure responsive means including two diaphragm members mounted in generally parallel, spaced relation in said housing means and being symmetrical when in their rest position about an axis of symmetry extending perpendicularly to the diaphragm axis; connecting means for linking said diaphragm members together at their centers; and a spring rod mechanism comprising a rod element for transmitting movement of said connecting means out through the pressure responsive means to permit sensing thereof, said rod element being secured at a first portion to said connecting means; support means pivotally mounting at least one end of said rod element with respect to said housing means; said rod element having at least one second portion thereof constructed and arranged to provide for bending thereof about the longitudinal axis of said rod element as said connecting means moves with said diaphragm members; an extension member secured to said one end of said rod element to effect angular movement in response to bending movement of said second rod element portion so as to transmit such movement beyond said pressure responsive means; a high pressure receiving chamber located in said housing means to communicate with one of said diaphragm members; a low pressure receiving chamber located in said housing means to communicate with the opposite diaphragm member; means for detecting displacement and converting displacement into an output response mounted above said pressure responsive means and including means responsive to the angular movement of the outer end of said extension member whereby a pressure differential created between said high and low pressure receiving chamber produces a resulting force which causes both diaphragm members to deform, transversely displacing said connecting means and axially bending said second rod element portion to angularly displace said rod extension member, the movement of the rod extention member being detected and converted to an output response by said detecting and converting means.

Claim 3

Dependent Claim 338 words

A differential pressure transmitter for controlling fluid flow rate and other parameters which can be related to a pressure differential in industrial systems and processes, comprising: housing means; pressure responsive means including two diaphragm members mounted in generally parallel, spaced relation in said housing means and being symmetrical when in their rest position about an axis of symmetry extending perpendicularly to the diaphragm axis; connecting means for linking said diaphragm members together at their centers; and a spring rod mechanism comprising a rod element for transmitting movement of said connecting means out through the pressure responsive means to permit sensing thereof, said rod element being secured at a first portion to said connecting means; support means pivotally mounting at least one end of said rod element with respect to said housing means; said rod element having at least one second portion thereof constructed and arranged to provide for bending thereof about the longitudinal axis of said rod element as said connecting means moves with said diaphragm members; an extension member secured to said one end of said rod element to effect angular movement in response to bending movement of said second rod element portion so as to transmit such movement beyond said pressure responsive means; a high pressure receiving chamber located in said housing means to communicate with one of said diaphragm members; a low pressure receiving chamber located in said housing means to communicate with the opposite diaphragm member; means for detecting displacement and converting displacement into an output response mounted above said pressure responsive means and including means responsive to the angular movement of the outer end of said extension member whereby a pressure differential created between said high and low pressure receiving chamber produces a resulting force which causes both diaphragm members to deform, transversely displacing said connecting means and axially bending said second rod element portion to angularly displace said rod extension member, the movement of the rod extention member being detected and converted to an output response by said detecting and converting means.

Claim 4

Dependent Claim 338 words

A differential pressure transmitter for controlling fluid flow rate and other parameters which can be related to a pressure differential in industrial systems and processes, comprising: housing means; pressure responsive means including two diaphragm members mounted in generally parallel, spaced relation in said housing means and being symmetrical when in their rest position about an axis of symmetry extending perpendicularly to the diaphragm axis; connecting means for linking said diaphragm members together at their centers; and a spring rod mechanism comprising a rod element for transmitting movement of said connecting means out through the pressure responsive means to permit sensing thereof, said rod element being secured at a first portion to said connecting means; support means pivotally mounting at least one end of said rod element with respect to said housing means; said rod element having at least one second portion thereof constructed and arranged to provide for bending thereof about the longitudinal axis of said rod element as said connecting means moves with said diaphragm members; an extension member secured to said one end of said rod element to effect angular movement in response to bending movement of said second rod element portion so as to transmit such movement beyond said pressure responsive means; a high pressure receiving chamber located in said housing means to communicate with one of said diaphragm members; a low pressure receiving chamber located in said housing means to communicate with the opposite diaphragm member; means for detecting displacement and converting displacement into an output response mounted above said pressure responsive means and including means responsive to the angular movement of the outer end of said extension member whereby a pressure differential created between said high and low pressure receiving chamber produces a resulting force which causes both diaphragm members to deform, transversely displacing said connecting means and axially bending said second rod element portion to angularly displace said rod extension member, the movement of the rod extention member being detected and converted to an output response by said detecting and converting means.

Claim 5

Dependent Claim 158 words

The differential pressure transmitter as claimed in claim 1 wherein said diaphragm members are in the form of first and second diaphragms and wherein said pressure responsive means further comprises: a backup plate having first and second generally parallel, spaced faces, diametrically disposed mounting hole which does not pass through either said first or said second backup plate face, the axis of the mounting hole being coincident with the axis of symmetry, and an axially disposed transverse hole extending between said first and second backup plate faces and intersecting the mounting hole, said first diaphragm being continuously supported at its periphery by and in sealing engagement with said first backup plate face, and said second diaphragm being continuously supported at its periphery by and in sealing engagement with said second backup plate face, said connecting means linking said diaphragms being freely disposed in the transverse hole and said spring rod mechanism being freely disposed in said mounting hole.

Claim 6

Dependent Claim 55 words

The differential pressure transmitter as claimed in claim 2 wherein said diaphragms have concentric corrugations, said backup plate has similar concentric corrugations which conform to and accept the respective, adjacent diaphragm corrugations and said backup plate and said diaphragms define an oil chamber which is filled with oil for dampening unrestrained deformation of said diaphragms.

Claim 7

Dependent Claim 125 words

The differential pressure transmitter as claimed in claim 1 wherein said spring rod element is cylindrical, said first portion has relatively large diameter and is coupled to said connecting means, said second portion being of relatively small diameter to provide for said bending, said extension member comprising an auxiliary rod mounted at the top of the reduced diameter portion of said spring rod element, and said support means comprises a flexible diaphragm clamped at its center between said rod element and said extension member and fixed at its periphery in said housing means, said connecting means and said support means supporting said rod at two points for eliminating output displacement error of the differential pressure transmitter due to changes in the attitude of transmitter installation.

Claim 8

Dependent Claim 154 words

The differential pressure transmitter as claimed in claim 1 wherein said spring rod element is cylindrical and has a middle first portion of relatively large diameter coupled to said connecting means, and two second portions of relatively small diameter extending in opposite directions axially away from said middle first portion to provide said bending and being equidistant from said enlarged diameter middle portion; wherein said extension member comprises an auxiliary rod mounted at the top of one of said second portions of said spring rod element, and wherein said support means comprises first and second flexible diaphragms, said first flexible diaphragm being clamped at its center between said one of said second spring rod portions and said extension member and said second flexible diaphragm being fixed to the other of said second spring rod portions, said first and second support means further being fixed in said housing to support said rod at three points.

Claim 9

Dependent Claim 65 words

The differential pressure transmitter as claimed in claim 1 wherein said means for detecting displacement and converting displacement to an output response is a displacement to electric signal transducer mounted relative to the axis of symmetry for detecting displacement only in a lateral direction from the axis of symmetry whereby error due to thermal expansion of the components of said pressure responsive means is minimized.

Claim 10

Dependent Claim 50 words

The differential pressure transmitter as claimed in claim 6 wherein said displacement to electric signal transducer is provided with an outlet unit having output elements for amplifying the output response and computing the pressure differential existing between said high and low pressure receiving chambers in terms of the output response.

Claim 11

Dependent Claim 199 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes, comprising: a twin capsule having a pair of corrugated diaphragms and a backup plate for supporting the two diaphragms at their peripheries, said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber therebetween; connecting means linking said diaphragms together at their centers; a spring mechanism in the form of a stepped rod mounted between and linked to the two diaphragms at their center portions through said connecting means disposed in the oil chamber; said stepped rod having a first portion of enlarged diameter, at least one second axially bendable portion of reduced diameter, support means for pivotably fixing each of said second portions to said backup plate and a third auxiliary extension portion extending out of said diaphragm capsule beyond said support means; and a displacement of electric signal transducer mounted in operative relation with said stepped rod extension portion, disposed in the oil chamber, for transducing the displacement of said extension portion into an electric signal.

Claim 12

Dependent Claim 199 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes, comprising: a twin capsule having a pair of corrugated diaphragms and a backup plate for supporting the two diaphragms at their peripheries, said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber therebetween; connecting means linking said diaphragms together at their centers; a spring mechanism in the form of a stepped rod mounted between and linked to the two diaphragms at their center portions through said connecting means disposed in the oil chamber; said stepped rod having a first portion of enlarged diameter, at least one second axially bendable portion of reduced diameter, support means for pivotably fixing each of said second portions to said backup plate and a third auxiliary extension portion extending out of said diaphragm capsule beyond said support means; and a displacement of electric signal transducer mounted in operative relation with said stepped rod extension portion, disposed in the oil chamber, for transducing the displacement of said extension portion into an electric signal.

Claim 13

Dependent Claim 258 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes and of the type having a pressure responsive unit, said unit comprising: a twin diaphragm capsule having a pair of corrugated diaphragms and a backup plate for supporting the two diaphragms at their peripheries said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber therebetween; connecting means linking said diaphragms together at their centers; a spring mechanism in the form of a stepped rod mounted between and linked to the two diaphragms at their center portions through said connecting means disposed in the oil chamber; said stepped rod having a first portion of enlarged diameter, at least one second axially bendable portion of reduced diameter, support means for pivotably fixing each of said second portions to said backup plate and a third auxiliary extension portion extending out of said diaphragm capsule beyond said support means; a shorting-ring mounted at the top of said spring mechanism on said extension portion; and a differential inductor displacement to electric signal transducer disposed in the oil chamber and mounted to detect the displacement output of said shorting-ring, whereby the inductance of said transducer changes when the displacement of said shorting-ring changes; the pressure responsive unit further comprising an outlet unit capable of supplying an external instrument with an electric signal corresponding to the differential pressure exerted on the two diaphragms.

Claim 14

Dependent Claim 258 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes and of the type having a pressure responsive unit, said unit comprising: a twin diaphragm capsule having a pair of corrugated diaphragms and a backup plate for supporting the two diaphragms at their peripheries said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber therebetween; connecting means linking said diaphragms together at their centers; a spring mechanism in the form of a stepped rod mounted between and linked to the two diaphragms at their center portions through said connecting means disposed in the oil chamber; said stepped rod having a first portion of enlarged diameter, at least one second axially bendable portion of reduced diameter, support means for pivotably fixing each of said second portions to said backup plate and a third auxiliary extension portion extending out of said diaphragm capsule beyond said support means; a shorting-ring mounted at the top of said spring mechanism on said extension portion; and a differential inductor displacement to electric signal transducer disposed in the oil chamber and mounted to detect the displacement output of said shorting-ring, whereby the inductance of said transducer changes when the displacement of said shorting-ring changes; the pressure responsive unit further comprising an outlet unit capable of supplying an external instrument with an electric signal corresponding to the differential pressure exerted on the two diaphragms.

Claim 15

Dependent Claim 44 words

The differential pressure transmitter as claimed in claim 9 wherein said first stepped rod portion is linked to said two diaphragms through said connecting means, and wherein said stepped rod has one second portion pivotably fixed by said support means to said backup plate.

Claim 16

Dependent Claim 65 words

The differential pressure transmitter as claimed in claim 9 wherein said stepped rod has a middle first portion linked to said two diaphragms through said connecting means, and has two second portions with reduced diameters, each of said second portions being pivotably fixed by said support means to said backup plate, said middle first portion being equally distant from the ends of said second portions.

Claim 17

Dependent Claim 263 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes, having a pressure responsive unit said pressure responsive unit comprising: a twin diaphragm capsule having a pair of corrugated diaphragms, and a backup plate for supporting the two diaphragms at their peripheries, said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber there-between; a spring mechanism, disposed in the oil chamber, comprising a main spring, an auxiliary spring, and a thin support spring, the main spring being in the form of a stepped rod and having a lower end linked to the two diaphragms through a connecting means, said main spring also having an upper end, said auxiliary spring being joined to said upper end of said main spring and having a top equipped with a shorting-ring, the spring mechanism being supported by said backup plate by way of said thin support spring held between said main spring and said auxiliary spring at their joint; and a differential transformer displacement to electric signal transducer, disposed in the oil chamber, whose inductance changes when the displacement of said shorting-ring changes; the pressure responsive unit further comprising an outlet unit, disposed above said twin diaphragm capsule, havinG output elements for computing and amplifying the output signal from the displacement to electric signal transducer and thus supplying an external instrument with an electric signal corresponding to the differential pressure exerted on the two diaphragms.

Claim 18

Dependent Claim 263 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes, having a pressure responsive unit said pressure responsive unit comprising: a twin diaphragm capsule having a pair of corrugated diaphragms, and a backup plate for supporting the two diaphragms at their peripheries, said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber there-between; a spring mechanism, disposed in the oil chamber, comprising a main spring, an auxiliary spring, and a thin support spring, the main spring being in the form of a stepped rod and having a lower end linked to the two diaphragms through a connecting means, said main spring also having an upper end, said auxiliary spring being joined to said upper end of said main spring and having a top equipped with a shorting-ring, the spring mechanism being supported by said backup plate by way of said thin support spring held between said main spring and said auxiliary spring at their joint; and a differential transformer displacement to electric signal transducer, disposed in the oil chamber, whose inductance changes when the displacement of said shorting-ring changes; the pressure responsive unit further comprising an outlet unit, disposed above said twin diaphragm capsule, havinG output elements for computing and amplifying the output signal from the displacement to electric signal transducer and thus supplying an external instrument with an electric signal corresponding to the differential pressure exerted on the two diaphragms.

Claim 19

Dependent Claim 227 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes, having a pressure responsive unit comprising: a twin diaphragm capsule having a pair of corrugated diaphragms, and a backup plate for supporting the two diaphragms at their peripheries, said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber therebetween; a spring mechanism, disposed in the oil chamber, comprising a main spring, an auxiliary spring, and a thin supporting spring, the main spring being in the form of a stepped rod and having a lower end linked to the two diaphragms through a connecting means, said main spring also having an upper end, said auxiliary spring being joined to said upper end of said main spring, the spring mechanism being supported by said backup plate by way of said thin support spring held between said main spring and said auxiliary spring at their joint; means for detecting displacement of said auxiliary spring and converting this displacement into an output signal disposed in the oil chamber; the pressure responsive unit further comprising an outlet unit, disposed above said twin diaphragm capsule, having output elements for computing and amplifying the output signal from the detecting and converting means.

Claim 20

Dependent Claim 227 words

A differential pressure transmitter for controlling fluid flow rate, and other parameters which can be related to a pressure differential, in industrial systems and processes, having a pressure responsive unit comprising: a twin diaphragm capsule having a pair of corrugated diaphragms, and a backup plate for supporting the two diaphragms at their peripheries, said backup plate having corrugations which conform to and accept the respective, adjacent diaphragm corrugations, said diaphragms and said backup plate forming a hermetically sealed oil chamber therebetween; a spring mechanism, disposed in the oil chamber, comprising a main spring, an auxiliary spring, and a thin supporting spring, the main spring being in the form of a stepped rod and having a lower end linked to the two diaphragms through a connecting means, said main spring also having an upper end, said auxiliary spring being joined to said upper end of said main spring, the spring mechanism being supported by said backup plate by way of said thin support spring held between said main spring and said auxiliary spring at their joint; means for detecting displacement of said auxiliary spring and converting this displacement into an output signal disposed in the oil chamber; the pressure responsive unit further comprising an outlet unit, disposed above said twin diaphragm capsule, having output elements for computing and amplifying the output signal from the detecting and converting means.

Claim 21

Dependent Claim 313 words

A differential pressure transmitter for controlling fluid flow rate and other parameters which can be related to a pressure differential in industrial systems and processes, comprising: housing means; pressure responsive means including two diaphragm members mounted in generally parallel, spaced relation in said housing means and being symmetrical when in their rest position about an axis of symmetry extending perpendicularly to the diaphragm axis; connecting means for linking said diaphragm members together at their centers; and a spring rod mechanism disposed on the axis of symmetry when in its rest position and coupled to said connecting means, said spring rod mechanism comprising a main spring rod having a first portion of enlarged diameter coupled to said connecting means and second portion of reduced diameter, and auxiliary spring rod mounted at the top of the reduced diameter portion of said main spring rod, and a support spring, clamped at its center between said main spring and said auxiliary spring rods and fixed at its periphery in said housing means, said connected means and said support spring supporting said main and auxiliary spring rods at two points for eliminating output displacement error of the differential pressure transmitter due to the attitude of transmitter installation; a high pressure receiving chamber located in said housing means to communicate with one of said diaphragm members; a low pressure receiving chamber located in said housing means to communicate with the opposite diaphragm member; means for detecting displacement and converting displacement into an output response mounted above said pressure responsive means whereby a pressure differential created between said high and low pressure receiving chambers produces a resulting force which causes both diaphragm members to deform, transversely displacing said connecting means and displacing said spring rod mechanism from the axis of symmetry, the spring rod mechanism displacement being detected and converted to an output response by said detecting and converting means.

Claim 22

Dependent Claim 313 words

A differential pressure transmitter for controlling fluid flow rate and other parameters which can be related to a pressure differential in industrial systems and processes, comprising: housing means; pressure responsive means including two diaphragm members mounted in generally parallel, spaced relation in said housing means and being symmetrical when in their rest position about an axis of symmetry extending perpendicularly to the diaphragm axis; connecting means for linking said diaphragm members together at their centers; and a spring rod mechanism disposed on the axis of symmetry when in its rest position and coupled to said connecting means, said spring rod mechanism comprising a main spring rod having a first portion of enlarged diameter coupled to said connecting means and second portion of reduced diameter, and auxiliary spring rod mounted at the top of the reduced diameter portion of said main spring rod, and a support spring, clamped at its center between said main spring and said auxiliary spring rods and fixed at its periphery in said housing means, said connected means and said support spring supporting said main and auxiliary spring rods at two points for eliminating output displacement error of the differential pressure transmitter due to the attitude of transmitter installation; a high pressure receiving chamber located in said housing means to communicate with one of said diaphragm members; a low pressure receiving chamber located in said housing means to communicate with the opposite diaphragm member; means for detecting displacement and converting displacement into an output response mounted above said pressure responsive means whereby a pressure differential created between said high and low pressure receiving chambers produces a resulting force which causes both diaphragm members to deform, transversely displacing said connecting means and displacing said spring rod mechanism from the axis of symmetry, the spring rod mechanism displacement being detected and converted to an output response by said detecting and converting means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-03-10	1978-09-09	1979-03-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-03-10	1982-09-09	1983-03-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-03-10	1986-09-09	1987-03-11	$7700.00	Window Closed / Lapsed

Symmetrically arranged, deflection type differential pressure transmitters for controlling industrial systems and processes

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