Patent US3845783A successfully refreshed from Google Patents.
US3845783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag diaphragms and bag diaphragm operated air dampers
Assignee: Danfoss AS
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Filing: 1973-05-10
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Granted: 1974-11-05
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Expires: 1993-05-10
Abstract
Abstract The present invention deals with a bag diaphragm comprising one or more flattened, extremely flexible bags assembled together, to be mounted between rigid plates at a variable mean distance and to be inflated in operation by a variable pressure difference, and with an air damper operated by means of a bar diaphragm as mentioned above, this air damper being suitable for air conditioning plants, in constant flow, or constant variable flow, or mixing appliances, in fresh air and return air ducts, where an air flow is to be controlled, the operation of the air damper being possible without any electrical or pneumatic energy supply system, due to the particular characteristics of the aforesaid bag diaphragm and particular design of the damper.
Inventors
- 👤 Lepeleire G De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:25
CPC Classifications
F; F01; F01B; F01B19/00; F01B19/02; F16; F16J; F16J3/00; F16J3/06; F16K; F16K7/00; F16K7/10; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F13/00; F24F13/08; F24F13/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7792; Y10T137/7837; Y10T137/7898
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
180 words
A pneumatically operated valve assembly comprising first and second rigid plate members mounted for movement relative to each other and being in oppositely facing relation to each other, conduit means surrounding said plate members, guide means for guiding the movement of one of said members relative to the other of said members, bag means sandwiched between said plate members, said bag means having first portions thereof fixedly secured to said plate members and second portions thereof extending between said plate members, said second portions being characterized by the absence of any significant bending resistance, and aperture means in said first plate member for admitting and exhausting air to and from said bag means to adjust the position of said second plate member relative to the position of said first plate member, said second plate member being pivotally mounted relative to said conduit means, air passage means extending externally of said conduit means from the upstream side of said plate members to said aperture means, said second plate member being movable to control the flow of air through said conduit means.
Claim 2
Dependent Claim
180 words
A pneumatically operated valve assembly comprising first and second rigid plate members mounted for movement relative to each other and being in oppositely facing relation to each other, conduit means surrounding said plate members, guide means for guiding the movement of one of said members relative to the other of said members, bag means sandwiched between said plate members, said bag means having first portions thereof fixedly secured to said plate members and second portions thereof extending between said plate members, said second portions being characterized by the absence of any significant bending resistance, and aperture means in said first plate member for admitting and exhausting air to and from said bag means to adjust the position of said second plate member relative to the position of said first plate member, said second plate member being pivotally mounted relative to said conduit means, air passage means extending externally of said conduit means from the upstream side of said plate members to said aperture means, said second plate member being movable to control the flow of air through said conduit means.
Claim 3
Dependent Claim
37 words
A valve assembly according to claim 1 including a casing surrounding said second plate member and said bag means, a slot in said casing, a blade attached to said second plate member and extending through said slot.
Claim 4
Dependent Claim
31 words
A valve assembly according to claim 2 including a hole in said casing to provide an internal static pressure for said casing equal to the static pressure of said conduit means.
Claim 5
Dependent Claim
67 words
A valve assembly according to claim 2 including a third plate member movable relative to said conduit means, a fourth plate member having an aperture and being fixed relative to said conduit means, second sealed flexible bag means between said third and fourth plate members, and a second air passage extending from the upstream side of said conduit means to said aperture of said fourth plate member.
Claim 6
Dependent Claim
19 words
A valve assembly according to claim 4 including means linking said first and third plate members for conjoint movement.
Claim 7
Dependent Claim
33 words
A valve assembly according to claim 2 including a pivotal shaft for said second plate member, a damper member externally of said casing and attached to said pivotal shaft for pivotal movement therewith.
Claim 8
Dependent Claim
61 words
A valve assembly accoRding to claim 4 including a second casing surrounding said third and fourth plate members, first and second pivotal shafts for said second and third plate members, first and second damper members internally of said conduit and externally of said casings attached respectively to said pivotal shafts for respective pivotal movement with said second and third plate members.
Claim 9
Dependent Claim
36 words
A valve assembly according to claim 7 in which said damper members pivot in the same direction to cause throttling of air flowing in said conduit means, and baffle means between said first and second casings.
Claim 10
Dependent Claim
44 words
A valve assembly according to claim 2 wherein said conduit means has adjoining air entrances, a movable blade between said entrances for adjusting the flow ratio of the air entering through said entrances, and means connecting said movable blade to said second plate member.
Claim 11
Dependent Claim
19 words
A valve assembly according to claim 9 wherein said second plate member is mounted exteriorly of said conduit means.
Claim 12
Dependent Claim
36 words
A valve assembly according to claim 2 including adjustable flap means in said conduit means for controlling the flow of air to said air passage which in turn controls the position of said second plate member.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |