Muffler

Claim 2

A muffler including: a. a cylindrical casing; and b. a tube assembly in said casing, said tube assembly including: a plurAlity of open ended long tubes circumferentially spaced about an inner wall portion of the casing with their axes parallel to the axis of the casing; a plurality of short open ended tubes disposed alternately between the long tubes circumferentially about said inner wall portion of the casing; and deflector means positioned in the casing for guiding gases passing into said casing back through the short tubes and thence forward through the long tubes towards the outlet end of the casing.

Claim 3

A muffler according to claim 1, in which said deflector means includes a funnel shaped deflector in the entrance end of said casing terminating in a cylindrical nose portion coaxial with the axis of the casing, said long and short tubes having first ends disposed in the annular space between said nose portion and said interior portion of the casing and extended second ends extending beyond the end of said nose portion, the long tubes extending for a greater distance than the short tubes; and a deflector plate spaced from the extended second ends of the short tubes, the second extended ends of the long tubes communicating with the other side of said deflector plate.

Claim 4

A muffler according to claim 1, including a closed end cylindrical pipe coaxially positioned in the outlet end portion of the cylindrical casing of smaller diameter than the casing, the closed end facing the second ends of the long tubes, said cylindrical pipe having openings in its side walls, 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 passing back along the exterior of the short pipe and thence forwardly through the short pipe out of the outlet end of the casing.

Claim 5

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 of a plurality of long open ended tubes with their axes parallel to the axis of the casing spaced circumferentially 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, 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 muffled.

Claim 6

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 of a plurality of long open ended tubes with their axes parallel to the axis of the casing spaced circumferentially 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, 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 muffled.

Claim 7

A muffler according to claim 4, including a support plate surrounding said nose for supporting the ends opposite the extended ends of the long and short tubes making up said tube assembly.

Claim 8

A muffler according to claim 5, including a spark arrest screen surrounding said closed end cylindrical pipe.