US3791483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound absorber
Assignee: Individual
•
Filing: 1972-06-19
•
Granted: 1974-02-12
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Expires: 1992-06-19
Abstract
Abstract A sound absorber, especially for aerodynamic installations, comprising a tubular-like housing closed at each end by a cover member, each said cover member leaving free a central throughpassage opening. Two dampening systems are housed within the housing, one such dampening system extending as a longitudinal dampening device over the housing inner wall, the other dampening system being formed by partition walls located perpendicular to the throughflow direction and distributed over the length of the housing. These partition walls only cover a part of the internal compartment of the housing left free by the longitudinal dampening device.
Inventors
- 👤 C Vasiljevic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:51
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/033; F24; F24F; F24F13/00; F24F13/24
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
183 words
A sound absorber, especially for aerodynamic installations, comprising a housing having a tubular wall defining a flow passage there-through, said housing including an inlet end and an outlet end, each of said ends being partially closed by covers having throughflow openings defined therein, an outer dampening system defined by a plurality of resonator inserts arranged tightly in a row behind one another and extending longitudinally over the inner surface of said tubular wall, said resonator inserts having an open side and a perforated floor, said open sides facing the inner surface of said wall and said perforated floors facing inwardly of said housing and covered by a continuous layer of sound absorbing material, an inner dampening system disposed coaxially with said other dampening system and partially obstructing said flow passage, said inner dampening system including a plurality of partition members distributed over the length of said housing and having side walls extending transversely of said flow passage and facing said inlet and outlet ends, and sound absorbing material covering said side wall of each of said partition members which faces said outlet end.
Claim 2
Dependent Claim
183 words
A sound absorber, especially for aerodynamic installations, comprising a housing having a tubular wall defining a flow passage there-through, said housing including an inlet end and an outlet end, each of said ends being partially closed by covers having throughflow openings defined therein, an outer dampening system defined by a plurality of resonator inserts arranged tightly in a row behind one another and extending longitudinally over the inner surface of said tubular wall, said resonator inserts having an open side and a perforated floor, said open sides facing the inner surface of said wall and said perforated floors facing inwardly of said housing and covered by a continuous layer of sound absorbing material, an inner dampening system disposed coaxially with said other dampening system and partially obstructing said flow passage, said inner dampening system including a plurality of partition members distributed over the length of said housing and having side walls extending transversely of said flow passage and facing said inlet and outlet ends, and sound absorbing material covering said side wall of each of said partition members which faces said outlet end.
Claim 3
Dependent Claim
51 words
The sound absorber as defined in claIm 1, wherein each cover has an opening defining a connection opening forming a throughflow area, and wherein the cross-section area of the flow passage left unobstructed by the partition members approximately corresponds to the throughflow area of the connection opening at the housing covers.
Claim 4
Dependent Claim
32 words
The sound absorber as defined in claim 2, wherein said partition members comprise a number of ring-shaped discs inserted into the housing, each of said ring-shaped discs having an internal throughflow opening.
Claim 5
Dependent Claim
40 words
The sound absorber as defined in claim 2, wherein said partition members comprises surface discs which are arranged at the central axis of the housing, and support means for supporting such surface discs relative to the wall of the housing.
Claim 6
Dependent Claim
31 words
The sound absorber as defined in claim 1, further including support means extending in the direction of the lengthwise axis of the housing for interconnecting and positionally retaining said partition members.
Claim 7
Dependent Claim
29 words
The sound absorber as defined in claim 5, wherein said partition members have edges confronting sound throughflow, said partition member edges being flexed in the direction of sound throughflow.
Claim 8
Dependent Claim
15 words
The sound absorber as defined in claim 1, wherein said sound-absorbing material is mineral wool.
Claim 9
Dependent Claim
15 words
The sound absorber as defined in claim 1, wherein the sound-absorbing material is foamed plastic.
Claim 10
Dependent Claim
31 words
The sound absorber as defined in claim 1, wherein the partition members are spaced from one another so as to define therebetween intermediate compartments, and sound-absorbing material filling such intermediate compartments.
Claim 11
Dependent Claim
30 words
The sound absorber as defined in claim 9, wherein the partition member walls facing the inlet end of the sound absorber are provided with an inflow lining reducing pressure losses.
Claim 12
Dependent Claim
15 words
The sound absorber as defined in claim 10, wherein said partition members comprise molded components.
Claim 13
Dependent Claim
32 words
The sound absorber as defined in claim 1, wherein the partition members are in the form of ring-shaped discs which merge with support means for the resonator inserts and the sound-absorbing material.
Claim 14
Dependent Claim
51 words
The sound absorber as defined in claim 1, wherein the partition members form circular discs located substantially at the axial center of the sound absorber housing, means for enclosing said circular discs together with the sound-absorbing material, and support means for securing the circular discs at the center of the housing.
Claim 15
Dependent Claim
30 words
The sound absorber as defined in claim 1, further including a plastic foil for covering the resonator inserts at their open side confronting the inner surface of the housing wall.
Claim 16
Dependent Claim
35 words
The sound absorber as defined in claim 1, wherein both dampening systems are constructed as pre-fabricated units each of which can be individually or collectively inserted from one end of the housing into such housing.
Claim 17
Dependent Claim
34 words
The sound absorber as defined in claim 1 wherein each of said resonator inserts is defined by a box, and wherein said open side and said perforated floor comprise opposite sides of said box.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |