US3853143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible diaphragm air damper
Assignee: Danfoss AS
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Filing: 1973-05-24
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Granted: 1974-12-10
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Expires: 1993-05-24
Abstract
Abstract The present invention deals with an air damper equipped with a flexible diaphragm, to be mounted in an air conditioning plant in order to control an air flow and/or an associated pressure drop, possibly in dependence on any variable to be controlled; it deals also with a flexible bag diaphragm suitable for measuring and/or controlling appliances involving a pressure difference, for example for the aforesaid air damper. A diaphragm conforming to the present invention is characterized by its shape, the way of mounting, and the extreme flexibility of its walls, which enables its use as an adjusting element in an air damper of a new design, and this with very small pressure differences.
Inventors
- 👤 Lepeleire G De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:19
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/20; F16K1/2007; F16K1/2021; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; G; G05; G05D; G05D7/00; G05D7/01; G05D7/0173; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/9682
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
A pneumatic control assembly for maintaing a constant downstream pressure in a conduit comprising, a conduit having an air flow control passage section, casing means forming a chamber, said casing means including wall means in common with said control passage section, said wall means having a transversely extending slot, moveable plate member mounted in said chamber, guide means for guiding the movement of said plate member, said plate member having a blade portion extending through said slot for controlling the opening of said control passage section pursuant to the position of said blade member plate portion, bag means sandwiched between said plate and said casing means, said bag means having first portions thereof fixedly secured to said plate member and said casing means and second portions thereof extending between said plate member and said casing, said second portions being characterized by the absence of any significant bending resistance, and aperture means in said casing for admitting and exhausting air to and from said bag means to bias said plate member in one direction, and weight means gravitally biasing said plate member in the opposite direction from said one direction, an opening in said wall means on the downstream side from said slot for providing fluid communication between the downstream side of said control passage section and the interior of said chamber.
Claim 2
Dependent Claim
221 words
A pneumatic control assembly for maintaing a constant downstream pressure in a conduit comprising, a conduit having an air flow control passage section, casing means forming a chamber, said casing means including wall means in common with said control passage section, said wall means having a transversely extending slot, moveable plate member mounted in said chamber, guide means for guiding the movement of said plate member, said plate member having a blade portion extending through said slot for controlling the opening of said control passage section pursuant to the position of said blade member plate portion, bag means sandwiched between said plate and said casing means, said bag means having first portions thereof fixedly secured to said plate member and said casing means and second portions thereof extending between said plate member and said casing, said second portions being characterized by the absence of any significant bending resistance, and aperture means in said casing for admitting and exhausting air to and from said bag means to bias said plate member in one direction, and weight means gravitally biasing said plate member in the opposite direction from said one direction, an opening in said wall means on the downstream side from said slot for providing fluid communication between the downstream side of said control passage section and the interior of said chamber.
Claim 3
Dependent Claim
21 words
A pneumatic control assembly according to claim 1 wherein said bag means is between said plate member and said wall means.
Claim 4
Dependent Claim
38 words
A pneumatic control assembly according to claim 1 wherein said plate member has the form of a lever and is pivotally mounted relative to said casing means, said weight means being oppositely fulcrumed relative to said bag means.
Claim 5
Dependent Claim
45 words
A pneumatic control assembly according to claim 2 including second bag means on the opposite side of said plate member from said first named bag means, and second aperture means in said casing for admitting and exhausting air to and from said second bag means.
Claim 6
Dependent Claim
27 words
A pneumatic control assembly according to claim 4 wherein one of said bag means has a larger cross sectional area than the other of said bag means.
Claim 7
Dependent Claim
81 words
A pneumatic control assembly according to claim 1 wherein said plate member has the form of a lever means for pivotally mounting said bag means relative to said casing means, said bag means being on one side of said fulcrum means, second bag means between said plate member and said casing means on the opposite side of said fulcrum means from said first named bag means, and spring means biasing said plate member in the opposite direction from said weight means.
References Cited (Backward Citations)
US2924934A
Cited
US3506038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |