US4679583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic control system, control means therefor and method of making the same
Assignee: Robertshaw Controls Co
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Filing: 1985-12-23
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Granted: 1987-07-14
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Expires: 2005-12-23
Abstract
Abstract A pneumatic control system, control unit and method of making the same are provided, the system comprising a pneumatic source, a pneumatically operated device that produces an output, and a control unit for interconnecting the source to the device. The control unit has an input interconnected to the source and an output interconnected to the device, the control unit having a set point for selecting a desired output of the device. The control unit has a valve unit for controlling the interconnection between the input and the output thereof so as to regulate the pressure value in the output of the control unit. The control unit has a regulating unit for operating the valve unit to tend to produce an output of the device that corresponds to the selected output of the set point. The regulating unit senses the pressure value in the output of the control unit and operates the valve unit so as to produce a pressure value in the output of the control unit that is substantially equal to the pressure value that will cause the device to produce the selected output.
Inventors
- 👤 William L. Lucas
- 👤 Clarence M. Asbill, III
- 👤 Gerald L. Frank
- 👤 David M. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:42
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2093; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2365; Y10T137/2409; Y10T137/7722; Y10T137/7758; Y10T137/7761
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
299 words
In a pneumatic control system comprising a pneumatic source, a pneumatically operated device that produces an output, and a control means for interconnecting said source to said device, said control means having an input means interconnected to said source and an output means interconnected to said device, said control means having set point means for selecting a desired output of said device, said control means having valve means for controlling the interconnection between said input means and said output means so as to regulate the pressure value in said output means, said control means having regulating means for operating said valve means to tend to produce an outpout of said device that corresponds to said selected output of said set point means, the improvement wherein said regulating means has a silicon transverse voltage strain gauge means that senses said pressure value in said output means and operates said valve means so as to produce a pressure value in said output means that is substantially equal to a pressure value that will cause said device to produce said selected output, said control means comprising a relay means having said input means and said output means, said relay means having a pilot input and a valve unit for interconnecting said input means to said output means in relation to the pressure value in said pilot input at said valve unit, said valve means being interconnected to said source and to said pilot input whereby said regulating means operates said valve means to create said pressure value in said pilot input at said valve unit in relation to the sensed pressure value in said output means, said regulating means also having another silicon transverse voltage strain gauge means that senses the pressure value in said pilot input at said valve unit thereof.
Claim 2
Dependent Claim
299 words
In a pneumatic control system comprising a pneumatic source, a pneumatically operated device that produces an output, and a control means for interconnecting said source to said device, said control means having an input means interconnected to said source and an output means interconnected to said device, said control means having set point means for selecting a desired output of said device, said control means having valve means for controlling the interconnection between said input means and said output means so as to regulate the pressure value in said output means, said control means having regulating means for operating said valve means to tend to produce an outpout of said device that corresponds to said selected output of said set point means, the improvement wherein said regulating means has a silicon transverse voltage strain gauge means that senses said pressure value in said output means and operates said valve means so as to produce a pressure value in said output means that is substantially equal to a pressure value that will cause said device to produce said selected output, said control means comprising a relay means having said input means and said output means, said relay means having a pilot input and a valve unit for interconnecting said input means to said output means in relation to the pressure value in said pilot input at said valve unit, said valve means being interconnected to said source and to said pilot input whereby said regulating means operates said valve means to create said pressure value in said pilot input at said valve unit in relation to the sensed pressure value in said output means, said regulating means also having another silicon transverse voltage strain gauge means that senses the pressure value in said pilot input at said valve unit thereof.
Claim 3
Dependent Claim
31 words
A pneumatic control system as set forth in claim 1 wherein said control means includes an accumulator means interconnected to said pilot input intermediate said valve means and said relay means.
Claim 4
Dependent Claim
24 words
A pneumatic control system as set forth in claim 2 wherein a restrictor means is disposed intermediate said valve means and said accumulator means.
Claim 5
Dependent Claim
64 words
A pneumatic control system as set forth in claim 1 wherein said valve means comprises a pair of valves one of which has an inlet means interconnected to said source and an outlet means interconnected to said pilot input and the other of which as an inlet means interconnected to said outlet means of said one valve and an outlet means interconnected to vent.
Claim 6
Dependent Claim
20 words
A pneumatic control system as set forth in claim 4 wherein each of said valves comprises an electrically operated valve.
Claim 7
Dependent Claim
322 words
In a control means for a pneumatic control system that has a pneumatic source and a pneumatically operated device that produces an output, said control means being adapted to interconnect said source to said device and having an input means adapted to be interconnected to said source and an output means adapted to be interconnected to said device, said control means having set point means for selecting a desired output of said device, said control means having valve means for controlling the interconnection between said input means and said output means so as to regulate the pressure value in said output means, said control means having regulating means for operating said valve means to tend to produce an output of said device that corresponds to said selected otuput of said set point means, the improvement wherein said regulating means has a silicon transverse voltage strain gauge means that is adapted to sense said pressure value in said output means and operate said valve means so as to produce a pressure value in said output means that is substantially equal to a pressure value that will cause said device to produce said selected output, said control means comprising a relay means having said input means and said output means, said relay means having a pilot input and a valve unit for interconnecting said input means to said output means in relation to the pressure value in said pilot input at said valve unit, said valve means being adapted to be interconnected to said source and to said pilot input whereby said regulating means is adapted to operate said valve means to create said pressure value in said pilot input at said valve unit in relation to the sensed pressure value in said output means, said regulating means also having another silicon transverse voltage strain gauge means that is adapted to sense the pressure value in said pilot input at said valve unit thereof.
Claim 8
Dependent Claim
322 words
In a control means for a pneumatic control system that has a pneumatic source and a pneumatically operated device that produces an output, said control means being adapted to interconnect said source to said device and having an input means adapted to be interconnected to said source and an output means adapted to be interconnected to said device, said control means having set point means for selecting a desired output of said device, said control means having valve means for controlling the interconnection between said input means and said output means so as to regulate the pressure value in said output means, said control means having regulating means for operating said valve means to tend to produce an output of said device that corresponds to said selected otuput of said set point means, the improvement wherein said regulating means has a silicon transverse voltage strain gauge means that is adapted to sense said pressure value in said output means and operate said valve means so as to produce a pressure value in said output means that is substantially equal to a pressure value that will cause said device to produce said selected output, said control means comprising a relay means having said input means and said output means, said relay means having a pilot input and a valve unit for interconnecting said input means to said output means in relation to the pressure value in said pilot input at said valve unit, said valve means being adapted to be interconnected to said source and to said pilot input whereby said regulating means is adapted to operate said valve means to create said pressure value in said pilot input at said valve unit in relation to the sensed pressure value in said output means, said regulating means also having another silicon transverse voltage strain gauge means that is adapted to sense the pressure value in said pilot input at said valve unit thereof.
Claim 9
Dependent Claim
30 words
A control means as set forth in claim 6 wherein said control means includes an accumulator means interconnected to said pilot input intermediate said valve means and said relay means.
Claim 10
Dependent Claim
23 words
A control means as set forth in claim 7 wherein a restrictor means is disposed intermediate said valve means and said accumulator means.
Claim 11
Dependent Claim
66 words
A control means as set forth in claim 6 wherein said valve means comprises a pair of valves one of which has an inlet means adapted to be interconnected to said source and an outlet means interconnected to said pilot input and the other of which has an inlet means interconnected to said outlet means of said one valve and an outlet means interconnected to vent.
Claim 12
Dependent Claim
19 words
A control means as set forth in claim 9 wherein each of said valves comprises an electrically operated valve.
References Cited (Backward Citations)
US2993497A
Cited
US3113582A
Cited
US3266380A
Cited
US3369561A
Cited
US3540401A
Cited
US3598138A
Cited
US4114852A
Cited
US4325399A
Cited
US4481967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |