US3786896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler
Assignee: Individual
•
Filing: 1973-05-10
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Granted: 1974-01-22
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Expires: 1993-05-10
Abstract
Abstract A muffler particularly suited to motorcycles includes a cylindrical casing incorporating a tube assembly comprised of long and short tubes circumferentially spaced about an inner wall portion of the casing. A deflector plate is positioned in the casing to receive and deflect backwardly gases passing through the short tubes. The gases are then caused to reverse again and pass through the long tubes which communicate with the other side of the deflector plate. The cylindrical casing itself includes an annular internal ridge close to the reversal point of the gases to trap carbon particles and thus prevent sparks. Gases exiting from the long pipes then pass through a baffle arrangement at the exit end of the cylindrical casing. The design results in substantial muffling of noise carried along the route of the gases through the muffler.
Inventors
- 👤 S Foster
- 👤 C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:12
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/084; F01N3/00; F01N3/06; F01N2230/00; F01N2230/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
336 words
A muffler comprising: a. an elongated outer cylindrical casing open at each end; b. a funnel shaped deflector in the casing having a mouth receiving gases and sealed at its periphery to the inner annular wall of the inlet end of the casing, the funnel tapering down into a coaxially aligned cylindrical nose within the casing; c. a tube assembly comprising a plurality of long open ended tubes with their axes parallel to the axis of the casing spaced circumfereneitally about the annular space between the nose and inner cylindrical wall of the casing and extending beyond the nose, and a plurality of short open ended tubes spaced alternately with the long tubes in said annular space extending beyond the nose but terminating short of the long tubes; d. a deflector plate receiving the extended ends of the long tubes to support the same, said deflector plate deflecting gases from the nose back through the extended ends of the short tubes to the annular space between the exterior of the funnel shaped deflector and interior of the surrounding casing, said interior of the annular casing surrounding the funnel shaped deflector having an internal annular ridge for trapping carbon particles from the gas stream, the gases then reversing direction to pass through the long tubes to the other side of the deflector plate; and, e. a closed end cylindrical pipe coaxially positioned in the outlet end portion of the outer casing smaller than the casing, the closed end facing gases from the long tubes, said cylindrical pipe having openings in its side wall, the open end of the pipe turning inwardly to define a short pipe terminating short of the closed end to thereby define a baffle for gases passing through the side wall openings, the gases then passing back along the exterior of the short pipe and thence forwardly through the short pipe out of the outlet end of said casing, whereby noise carried along the route of the gases is muffler and sparking is inhibited.
Claim 2
Dependent Claim
336 words
A muffler comprising: a. an elongated outer cylindrical casing open at each end; b. a funnel shaped deflector in the casing having a mouth receiving gases and sealed at its periphery to the inner annular wall of the inlet end of the casing, the funnel tapering down into a coaxially aligned cylindrical nose within the casing; c. a tube assembly comprising a plurality of long open ended tubes with their axes parallel to the axis of the casing spaced circumfereneitally about the annular space between the nose and inner cylindrical wall of the casing and extending beyond the nose, and a plurality of short open ended tubes spaced alternately with the long tubes in said annular space extending beyond the nose but terminating short of the long tubes; d. a deflector plate receiving the extended ends of the long tubes to support the same, said deflector plate deflecting gases from the nose back through the extended ends of the short tubes to the annular space between the exterior of the funnel shaped deflector and interior of the surrounding casing, said interior of the annular casing surrounding the funnel shaped deflector having an internal annular ridge for trapping carbon particles from the gas stream, the gases then reversing direction to pass through the long tubes to the other side of the deflector plate; and, e. a closed end cylindrical pipe coaxially positioned in the outlet end portion of the outer casing smaller than the casing, the closed end facing gases from the long tubes, said cylindrical pipe having openings in its side wall, the open end of the pipe turning inwardly to define a short pipe terminating short of the closed end to thereby define a baffle for gases passing through the side wall openings, the gases then passing back along the exterior of the short pipe and thence forwardly through the short pipe out of the outlet end of said casing, whereby noise carried along the route of the gases is muffler and sparking is inhibited.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |