Patent US3561561A successfully refreshed from Google Patents.
US3561561A
Expired / Lapsed
US
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Sound attenuating device
Assignee: Individual
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Filing: 1969-11-28
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Granted: 1971-02-09
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Expires: 1989-11-28
Abstract
Abstract This disclosure relates to improved sound attenuating devices for exhaust gas, such as is presently utilized in various industries to muffle the sound of pneumatically operated industrial equipment. The basic embodiment includes an exhaust entrance tube, a shell encircling the tube defining a gas expansion chamber or plenum having exhaust slots, and a screen overlying the exhaust slots. The tube and shell are integrally formed of plastic to improve the sound attenuating characteristics and reduce the safety hazard of separate secured parts. The second disclosed embodiment includes a sound absorbing medium in the form of a cellular disc opposite the gas exit of the tube and a floating perforated disc located between the tube exit and the sound absorbing medium. A baffle deflector is also provided at the gas exit of the tube, deflecting the gas into the sound absorbing medium and then into the annular expansion chamber surrounding the tube. The third embodiment includes a metering valve having a nonrotatable, axially shiftable cylindrical plug telescopically received in the gas exit end of the tube. The metering plug has a plurality of longitudinal Vshaped tapered slots increasing in width toward the plug end received in the tube, accurately controlling the flow of gas.
Inventors
- 👤 John B Trainor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:44
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/033; F01; F01N; F01N1/00; F01N1/08; F01N1/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
133 words
A sound attenuating device for exhaust gas, comprising: a plastic cylindrical gas entrance tube, a plastic shell integral with and encircling said tube and defining a cylindrical expansion chamber receiving the gas from said tube, said tube extending into said chamber approximately two-thirds the axial length of said chamber, but spaced from the encircling wall of the shell such that the cross-sectional area of the cylindrical chamber is at least four times the internal area of the tube, said shell having an open end opposite the gas exit end of said tube and said encircling wall provided with a plurality of circumferential gas exhaust slots, a closure member threadably received over the open end of said shell, and an annular screen member received within said chamber overlying the slots in the shell wall.
Claim 2
Dependent Claim
133 words
A sound attenuating device for exhaust gas, comprising: a plastic cylindrical gas entrance tube, a plastic shell integral with and encircling said tube and defining a cylindrical expansion chamber receiving the gas from said tube, said tube extending into said chamber approximately two-thirds the axial length of said chamber, but spaced from the encircling wall of the shell such that the cross-sectional area of the cylindrical chamber is at least four times the internal area of the tube, said shell having an open end opposite the gas exit end of said tube and said encircling wall provided with a plurality of circumferential gas exhaust slots, a closure member threadably received over the open end of said shell, and an annular screen member received within said chamber overlying the slots in the shell wall.
Claim 3
Dependent Claim
59 words
The sound attenuating device defined in claim 1, characterized in that said plastic shell is integrally joined to said plastic tube by a radial wall opposite said open end of the shell, and said radial wall includes an aperture sealed by a resilient blowout plug adapted to relieve pressure in the chamber if the pressure exceeds a predetermined limit.
Claim 4
Dependent Claim
31 words
The sound attenuating device defined in claim 1, characterized in that said closure member is generally cup-shaped and includes a sound absorbing medium opposite the gas exit end of said tube.
Claim 5
Dependent Claim
45 words
The sound attenuating device defined in claim 3, characterized in that a partition means is disposed between the outlet of said tube and said sound absorbing medium, at least a portion of said partition means movable relative to the tube upon impact of exhaust gas.
Claim 6
Dependent Claim
26 words
The sound attenuating device defined in claim 4, characterized in that said partition means is a perforated plate movable generally in the axis of said tube.
Claim 7
Dependent Claim
45 words
The sound attenuating device defined in claim 4, characterized in that a plurality of radially spaced concentric gas baffles are provided adjacent the gas exit of the tube directing the gas first into the sound absorbing medium, and then into the chamber surrounding the tube.
Claim 8
Dependent Claim
42 words
The sound attenuating device defined in claim 6, characterized in that the inner baffle has an internal diameter approximately equal to the internal diameter of said tube and provides a closed circuit gas path between said tube and said cup-shaped closure member.
Claim 9
Dependent Claim
41 words
The sound attenuating device defined in claim 7, characterized in that the ends of said gas baffles, spaced from said closure member, are tapered radially outwardly, directing the gas into said chamber surrounding the tube and radially outwardly toward said slots.
Claim 10
Dependent Claim
49 words
The sound attenuating device defined in claim 1, characterized in that a partition is disposed between the gas exit of said tube and said closure member, said partition having at least a portion movable relative to said tube in response to the impact of gas exhausted from said tube.
Claim 11
Dependent Claim
27 words
The sound attenuating device defined in claim 9, characterized in that said partition is a perforated circular disc slidably received between said tube and said closure member.
Claim 12
Dependent Claim
92 words
The sound attenuating device defined in claim 1, characterized in that a gas metering valve is disposed within said chamber, metering the volume of gas exhausted from said tube, said metering valve including a valve plug partially received within the gas exit end of said tube having a plurality of tapered V-shaped longitudinal notches increasing in width toward the end of the plug received within said tube and providing an accurate control of exhaust gas volume entering said chamber as the valve plug is moved into and out of the tube end.
Claim 13
Dependent Claim
48 words
The sound attenuating device defined in claim 11, characterized in that said valve plug is telescopically received within the gas exit end of said tube and interfits therewith to prevent circumaxial movEment of said plug as it is shifted axially to control the volume of the exhaust gas.
Claim 14
Dependent Claim
27 words
The sound attenuating device defined in claim 12, characterized in that said valve plug is threadably received on a threaded male member extending through said closure member.
Claim 15
Dependent Claim
44 words
The sound attenuating device defined in claim 1, characterized in that said plastic shell is integrally joined to said plastic tube by a radial wall opposite said open end of the shell, and said blowout plug is in an aperture in such radial wall.
Claim 16
Dependent Claim
46 words
The invention defined in claim 9 characterized in that means are provided between the partition and said closure member biasing the partition toward the end of the tube and yieldable to impact of exhaust gas against the partition from the tube to cushion shock waves thereof.
Claim 17
Dependent Claim
55 words
The invention defined in claim 13 characterized in that a knob is fixed on said male member outside the closure member and has a resilient skirt portion bearing against the exterior of the closure member, and cooperating detent means on the skirt and exterior of the closure member for yieldingly locking the knob against rotation.
Claim 18
Dependent Claim
205 words
A sound attenuating device for exhaust gas, comprising: a plastic cylindrical gas entrance tube, a plastic shell encircling the tube and defining a cylindrical expansion chamber receiving the gas from the tube, said tube extending along the length of the chamber spaced from the encircling wall thereof and having a length to convert turbulent gas flow to substantially laminar flow, said chamber having a cross-sectional area around the tube several times the cross-sectional area of the tube, plastic end walls closing opposite ends of the chamber, one of said end walls being integral with and encircling the tube and provided with an aperture sealed by a resilient blowout plug and the other end wall being spaced from the end of the tube within the chamber providing an unrestricted flow path for exhaust gas out of the tube, one of said end walls of the chamber being integral with the shell and the other end wall being threadably connected to the shell for access to the interior of the chamber, the wall of said shell provided with a plurality of exhaust ports for escape of exhaust gas from the chamber, and an annular porous member received within the chamber overlying the ports in the shell wall.
Claim 19
Dependent Claim
205 words
A sound attenuating device for exhaust gas, comprising: a plastic cylindrical gas entrance tube, a plastic shell encircling the tube and defining a cylindrical expansion chamber receiving the gas from the tube, said tube extending along the length of the chamber spaced from the encircling wall thereof and having a length to convert turbulent gas flow to substantially laminar flow, said chamber having a cross-sectional area around the tube several times the cross-sectional area of the tube, plastic end walls closing opposite ends of the chamber, one of said end walls being integral with and encircling the tube and provided with an aperture sealed by a resilient blowout plug and the other end wall being spaced from the end of the tube within the chamber providing an unrestricted flow path for exhaust gas out of the tube, one of said end walls of the chamber being integral with the shell and the other end wall being threadably connected to the shell for access to the interior of the chamber, the wall of said shell provided with a plurality of exhaust ports for escape of exhaust gas from the chamber, and an annular porous member received within the chamber overlying the ports in the shell wall.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |