Patent US4449549A successfully refreshed from Google Patents.
US4449549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter device for air conduit or the like
Assignee: H KRANTZSTRASSE A GERMAN CORP
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Filing: 1983-02-07
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Granted: 1984-05-22
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Expires: 2003-02-07
Abstract
Abstract The invention relates to an improved shuttering device for preventing back-flow in air conduits or the like. The device includes an attachment section and a frame section, the latter being provided with a series of elastic lamellae shiftable between blocking and unblocking positions within the frame, the frame having in addition guide plates extending axially of the conduit to prevent transverse currents.
Inventors
- 👤 Franz Weck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:49
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/031; F16K15/035; F16K2200/00; F16K2200/20; F16K2200/203; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7879; Y10T137/7888; Y10T137/7891; Y10T137/7898
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
A chatter resistant shutter device for an air conduit or the like comprising a rectangular attachment section adapted to be mounted to a conduit end, a rectangular frame section affixed to an end of said attachement section, said frame section including side wall portions and upper and lower wall portions, a plurality of mutually spaced apart parallel web members extending between said side wall portions adjacent the interface of said sections, said webs defining therebetween a series of generally rectangular openings, a plurality of generally rectangular elastomeric lamellae in number corresponding to the number of said openings, each said lammelae having an upper edge portion affixed to a said web, said lamellae being shiftable within said frame section responsive to flow in said conduit between a closed position whereat said lamellae are normal to the longitudinal axis of said frame in mutually overlapping position and an open position generally parallel to said axis, and a guide plate member fixed to each said web and extending parallel to said axis.
Claim 2
Dependent Claim
169 words
A chatter resistant shutter device for an air conduit or the like comprising a rectangular attachment section adapted to be mounted to a conduit end, a rectangular frame section affixed to an end of said attachement section, said frame section including side wall portions and upper and lower wall portions, a plurality of mutually spaced apart parallel web members extending between said side wall portions adjacent the interface of said sections, said webs defining therebetween a series of generally rectangular openings, a plurality of generally rectangular elastomeric lamellae in number corresponding to the number of said openings, each said lammelae having an upper edge portion affixed to a said web, said lamellae being shiftable within said frame section responsive to flow in said conduit between a closed position whereat said lamellae are normal to the longitudinal axis of said frame in mutually overlapping position and an open position generally parallel to said axis, and a guide plate member fixed to each said web and extending parallel to said axis.
Claim 3
Dependent Claim
23 words
A shutter assembly in accordance with claim 1 wherein the uppermost said web guide plate member is defined by said upper wall portion.
Claim 4
Dependent Claim
22 words
A shutter assembly in accordance with claim 1 wherein the axial dimension of said frame exceeds the transverse dimension of said lamellae.
Claim 5
Dependent Claim
43 words
A shutter assembly in accordance with claim 3 wherein said lamellae include a rigid plate member affixed to at least one face thereof, said plate members being of smaller area than said lamellae, said lamellae including border portions projecting beyond said plate members.
Claim 6
Dependent Claim
48 words
A shutter assembly in accordance with claim 4 wherein said rigid plates are affixed to the surfaces of said lamellae nearest said attachment section, said plates including on the edges nearest the lower surface of said lamellae a flange portion extending at an angle away from said lamellae.
Claim 7
Dependent Claim
24 words
A shutter assembly in accordance with claim 1 wherein said upper edges of said lamellae are clamped between said webs and said attachment section.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |