Patent US3877477A successfully refreshed from Google Patents.
US3877477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic two-position controller
Assignee: JC Eckardt AG
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Filing: 1971-08-13
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Granted: 1975-04-15
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Expires: 1991-08-13
Abstract
Abstract A fluid-pressure operated two-position controller in which an actuator for regulating the pressure from a source to provide an output pressure is displaced in response to the differential pressure in a pair of pressure chambers having elastic walls connected to the actuator, and further including an adjustable spring member capable of applying a selectively variable bias to said actuator to render the switching points of the controller adjustable.
Inventors
- 👤 Horst Bader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:02
CPC Classifications
F; F15; F15B; F15B5/00; F15B5/003; F15C; F15C3/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
A fluid-pressure operated two-position controller using a differential pressure amplifier operating with a source of supply pressure and providing an output pressure of first and second values in dependence upon a variable input pressure value reaching first and second set point values, comprising: first and second pressure chambers defined by elastic walls, said first chamber being supplied with a first control pressure of a predetermined value and said second chamber being supplied with a second control pressure, actuator means connected to the elastic walls of said first and second pressure chambers so as to be displaced in response to the differential pressure in said chambers for regulating the magnitude of said supply pressure to produce the output pressure of first and second values, spring means for biasing said actuator means in the same direction as one of said first and second pressure chambers, and pressure distributor means for providing said second pressure including a pair of fluid throttle resistors connected in series between an input pressure source providing an input pressure of variable value and said output pressure, said second pressure being derived from a point between said pair of fluid throttle resistors.
Claim 2
Dependent Claim
193 words
A fluid-pressure operated two-position controller using a differential pressure amplifier operating with a source of supply pressure and providing an output pressure of first and second values in dependence upon a variable input pressure value reaching first and second set point values, comprising: first and second pressure chambers defined by elastic walls, said first chamber being supplied with a first control pressure of a predetermined value and said second chamber being supplied with a second control pressure, actuator means connected to the elastic walls of said first and second pressure chambers so as to be displaced in response to the differential pressure in said chambers for regulating the magnitude of said supply pressure to produce the output pressure of first and second values, spring means for biasing said actuator means in the same direction as one of said first and second pressure chambers, and pressure distributor means for providing said second pressure including a pair of fluid throttle resistors connected in series between an input pressure source providing an input pressure of variable value and said output pressure, said second pressure being derived from a point between said pair of fluid throttle resistors.
Claim 3
Dependent Claim
30 words
A fluid-pressure operated two-position controller as defined in claim 1 wherein said spring means includes an adjustable spring member capable of applying a selectively adjustable bias to said actuator means.
Claim 4
Dependent Claim
23 words
A fluid-pressure operated two-position controller as defined in claim 2 wherein at least one of said pair of fluid throttle resistors is adjustable.
Claim 5
Dependent Claim
103 words
A fluid-pressure operated two-position controller as defined in claim 3 wherein said actuator means includes a pivotably mounted lever having one end connected to said elastic walls of said first and second pressure chambers so as to be displaced thereby in respectively opposite directions, baffle means including a pressure amplifier and a nozzle connected to the input of said amplifier and receiving a pressure from said source of supply pressure, the free end of said lever being disposed adjacent said nozzle so as to vary the pressure from said source of supply pressure, the output of said amplifier serving as said output pressure.
Claim 6
Dependent Claim
111 words
A fluid-pressure operated two-position controller as defined in claim 1 wherein said actuator means includes first and second balls of equal diameter displaceably arranged in the bore of a housing, said balls being operatively connected to the elastic wall of a respective one of said first and second pressure chambers so as to be displaced by movement thereof, said housing being provided with a pair of output bores spaced by the diameter of the balls and in alignment therewith so as to be valved by said balls, and an input bore in said housing providing said source pressure to said balls for application to said output bores in a controlled manner.
Claim 7
Dependent Claim
30 words
A fluid-pressure operated two-position controller as defined in claim 5 wherein said spring means includes an adjustable spring member capable of applying a selectively adjustable bias to said actuator means.
Claim 8
Dependent Claim
23 words
A fluid-pressure operated two-position controller as defined in claim 6 wherein at least one of said pair of fluid throtTle resistors is adjustable.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |