US3746126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound-muffling device
Assignee: QUIJANO DONALD R
•
Filing: 1971-07-09
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Granted: 1973-07-17
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Expires: 1991-07-09
Abstract
Abstract A sound-muffling device for use in muffling the explosive sounds in an exhaust gas system of the type commonly employed in internal combustion engines. A length of flat metal bar is formed into a helix having a diameter to fit into an elongated conduit in the exhaust system and to be releasably fixed therein to muffle and absorb sounds from the stream of exhaust gas passing through the conduit. The length diameter and pitch of the helix are controlled to produce the desired degree of sound-muffling without producing excessive back-pressure in the engine exhaust system.
Inventors
- 👤 Cardenas I De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:05
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N1/00; F01N1/08; F01N1/12; F01N13/08; F01N13/082
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
An exhaust system for an internal combustion engine comprising an elongated conduit consisting of an exhaust pipe section and a tail pipe section for conveying exhaust gases from the engine exhaust manifold, and a muffler including an elongated cylindrical sleeve having an outside diameter substantially equal to the internal diameter of one of said pipe sections and removably mounted thereon, a helicoidal insert mounted in and dividing the interior of said cylindrical sleeve into two separate helical flow paths, said helicoidal insert being formed from an elongated strip of flat, smooth metal stock twisted into the form of a helix having a diametr substantially equal to the internal diameter of said sleeve, and means rigidly connectng one end portion only of said helicoidal insert to said sleeve whereby differential thermal expansion between said sleeve and said helicoidal insert is accommodated independently of differential expansion or relative movement between said sleeve and said one pipe section.
Claim 2
Dependent Claim
155 words
An exhaust system for an internal combustion engine comprising an elongated conduit consisting of an exhaust pipe section and a tail pipe section for conveying exhaust gases from the engine exhaust manifold, and a muffler including an elongated cylindrical sleeve having an outside diameter substantially equal to the internal diameter of one of said pipe sections and removably mounted thereon, a helicoidal insert mounted in and dividing the interior of said cylindrical sleeve into two separate helical flow paths, said helicoidal insert being formed from an elongated strip of flat, smooth metal stock twisted into the form of a helix having a diametr substantially equal to the internal diameter of said sleeve, and means rigidly connectng one end portion only of said helicoidal insert to said sleeve whereby differential thermal expansion between said sleeve and said helicoidal insert is accommodated independently of differential expansion or relative movement between said sleeve and said one pipe section.
Claim 3
Dependent Claim
20 words
The muffler as defined in claim 1 wherein the pitch P of said helix is about one-half the diameter thereof.
Claim 4
Dependent Claim
51 words
The muffler as defined in claim 2, the further improvement wherein said sleeve is mounted in telescoping relation with the forward end of said tail pipe with the rear end of said sleeve engaging a bend in the tail pipe to prevent rearward movement through aid tail pipe beyond said bend.
Claim 5
Dependent Claim
34 words
The muffler defined in claim 2, the further improvement wherein said sleeve is mounted in the rear end portion of said tail pipe, and comprising removable means retaining said sleeve within said tail pipe.
Claim 6
Dependent Claim
56 words
The muffler defined in claim 1, and further comprising a separate length of conduit having an open forward end connected to the discharge end of said exhaust pipe and an open rearward end connected to the open inlet of said tail pipe, and means mounting said sleeve and said helicoidal insert within said length of conduit.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |