US3759157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-talk attenuating supply air and exhaust air device in ventilation installations
Assignee: Svenska Flaktfabriken AB
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Filing: 1971-12-01
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Granted: 1973-09-18
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Expires: 1991-12-01
Abstract
Abstract A device for supplying or exhausting air in the rooms of a multiple-room building having a central system with ducts common to several rooms. The device is a chamber which has a convergent tubular inlet frustum for delivering a stream into the chamber, and an outlet opening for delivering the air from the chamber. A silencer passageway is between the smaller open end of the tubular frustum and the outlet opening for attenuating crosstalk. The passageway is preferably surrounded by sound-absorbing material such as mineral wool.
Inventors
- 👤 B Larkfeldt
- 👤 S Akesson
- 👤 I Josefsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:55
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F16; F16L; F16L55/00; F16L55/02; F24F13/0263; F24F13/24; F24F7/00; F24F2007/0025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
168 words
A cross-talk attenuating supply air and exhaust air device in ventilation installations comprising a box for connection to a distribution duct of the installation having opposite end walls spaced apart to provide a closed chamber, said end walls having aligned openings therein, an inlet pipe in the form of an openended tapered element with the large end fitted into the inlet opening in one end wall of the chamber and with the small end projecting into the chamber toward the outlet opening in the other end wall, said pipe being shorter than said chamber whereby its small end terminates in spaced relation to said outlet opening in the other chamber end wall, said opening consisting of a hole larger than said small end and being positioned so that the air jet delivered from the small end of the inlet pipe as a stream separate from the surrounding air passes through said hole and is prevented from interfering with the hole edges and thereby from producing disturbing blowing noise.
Claim 2
Dependent Claim
168 words
A cross-talk attenuating supply air and exhaust air device in ventilation installations comprising a box for connection to a distribution duct of the installation having opposite end walls spaced apart to provide a closed chamber, said end walls having aligned openings therein, an inlet pipe in the form of an openended tapered element with the large end fitted into the inlet opening in one end wall of the chamber and with the small end projecting into the chamber toward the outlet opening in the other end wall, said pipe being shorter than said chamber whereby its small end terminates in spaced relation to said outlet opening in the other chamber end wall, said opening consisting of a hole larger than said small end and being positioned so that the air jet delivered from the small end of the inlet pipe as a stream separate from the surrounding air passes through said hole and is prevented from interfering with the hole edges and thereby from producing disturbing blowing noise.
Claim 3
Dependent Claim
61 words
A cross-talk attenuating supply air and exhaust air device according to Claim 1 characterized by a sound-absorbing material in the interior of said chamber surrounding the large end of the inlet pipe and spaced from the terminus of said pipe and spaced from the hole edges and contoured to avoid interfering with the air jet stream delivered from said inlet pipe.
Claim 4
Dependent Claim
12 words
A device according to claim 2 wherein said material is mineral wool.
Claim 5
Dependent Claim
35 words
A device according to claim 1 including means to connect the chamber to a high-pressure system for comfort ventilation comprising distribution and return air ducts common to different rooms and connected to a central unit.
Claim 6
Dependent Claim
30 words
A device according to claim 4 wherein said device is a supply device and said connecting means connects the large end of said inlet pipe to the distribution air duct.
Claim 7
Dependent Claim
29 words
A device according to claim 4 wherein said device is an exhaust device and said connecting means connects the outlet opening of said chamber to the return air duct.
Claim 8
Dependent Claim
35 words
A device according to claim 1 wherein said inlet pipe is in the form of an open-ended rectangular pyramid having convergent side walls of a greater length than the width of the convergent end walls.
Claim 9
Dependent Claim
26 words
A device according to claim 7 wherein one of said side walls is laterally displaceable to afford adjustment of the air resistance of the inlet pipe.
Claim 10
Dependent Claim
28 words
A device according to claim 7 wherein said side walls converge with an included angle which is substantially less than the included angle of the converging end walls.
Claim 11
Dependent Claim
29 words
A device according to claim 9, wherein the Included angle of the side walls is approximately 40* and the included angle of the end walls is approximately 65* .
References Cited (Backward Citations)
US1754411A
Cited
US1811762A
Cited
US2229119A
Cited
US2725948A
Cited
DE1102371B
Cited
US2855068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |