Muffler

Claim 2

An exhaust gas muffler comprising an elongated tubular shell having a substantially figure eight cross section, header at opposite ends closing the interIor of the shell, one of said headers having an inlet opening therein and the other having an outlet opening therein, and internal gas passage and silencing structure inside the shell to convey gas from the inlet to the and attenuate sound en route.

Claim 3

A muffler as set forth in claim 1 wherein said gas passage and silencing structure includes a first open-ended tube located in one side of the figure eight and a second open-ended tube overlapping the first and located in the other side of the figure eight and in series gas flow relationship with the first tube to provide a triflow pattern for gas flow.

Claim 4

A muffler as set forth in claim 2 wherein said structure includes a third open-ended tube spaced axially from the first and second located in one side of the figure eight and having a first perforated area in the wall thereof opening into the communicating with both sides of the figure eight.

Claim 5

A muffler as set forth in claim 3 wherein said third tube has a second perforated area in the wall thereof spaced axially from the first area and opening into and communicating with both sides of the figure eight, both said perforated areas opening into a common space within said shell extending across the full cross section thereof and along a length exceeding the length encompassed on the tube by the two areas.

Claim 6

A muffler as set forth in claim 1 wherein said gas passage and silencing structure includes an open-ended tube located in one side of the figure eight and having a perforated area in the wall thereof opening into and communicating with both sides of the figure eight.

Claim 7

An exhaust gas muffler comprising an elongated tubular shell having a substantially figure eight cross section, headers at opposite ends closing the interior of the shell one of which has an inlet opening therein and the other of which has an outlet opening therein, a pair of axially spaced transverse partitions inside the shell and subdividing the interior of the shell into a pair of end chambers and an intermediate chamber which is substantially shorter in length than either of the end chambers, first and second open-ended perforated tubes located in one of said end chambers and overlapping each other axially with one of said tubes located in one side of the figure eight and the other of said tubes located in the other side of the figure eight, said first and second tubes being in series gas flow relationship in said end chamber to provide a triflow pattern for gas flow through the chamber, one of said tubes opening into said intermediate chamber and the other communicating with an opening in a header, a third tube communicating with the other opening in the other header and located in the other end chamber on a side of the figure eight, said third opening into the said intermediate chamber, said third tube having axially spaced perforated areas opening into said end chamber, said third tube having additional perforated areas and imperforate shells mounted on said third tube in said end chamber and surrounding said additional perforated areas to form high frequency sound attenuating chambers.

Claim 8

An exhaust gas muffler comprising an elongated tubular shell having a substantially figure eight cross section, headers at opposite ends closing the interior of the shell one of which has an inlet opening therein and the other of which has an outlet opening therein, a pair of axially spaced transverse partitions inside the shell and subdividing the interior of the shell into a pair of end chambers and an intermediate chamber which is substantially shorter in length than either of the end chambers, first and second open-ended perforated tubes located in one of said end chambers and overlapping each other axially with one of said tubes located in one side of the figure eight and the other of said tubes located in the other side of the figure eight, said first and second tubes being in series gas flow relationship in said end chamber to provide a triflow pattern for gas flow through the chamber, one of said tubes opening into said intermediate chamber and the other communicating with an opening in a header, a third tube communicating with the other opening in the other header and located in the other end chamber on a side of the figure eight, said third opening into the said intermediate chamber, said third tube having axially spaced perforated areas opening into said end chamber, said third tube having additional perforated areas and imperforate shells mounted on said third tube in said end chamber and surrounding said additional perforated areas to form high frequency sound attenuating chambers.

Claim 9

A muffler as set forth in claim 6 wherein said third tube and the other tube which opens into the intermediate chamber are located on opposite sides of the figure eight.

Claim 10

A muffler as set forth in claim 7 wherein an end of the third tube is mounted in a said opening in an end header and an end of one of the first and second tubes is mounted in said opening in the other end header.

Claim 11

A muffler for silencing sound in flowing gases comprising an elongated shell, a gas flow tube extending longitudinally of the shell and substantially fixed in position relative to the shell, a transverse partition in the shell and spaced from said tube, and a support bracket fixed to the tube and to the partition whereby said tube supports said partition in a substantially fixed position.

Claim 12

A muffler for silencing sound in flowing gases comprising an elongated shell, a gas flow tube extending longitudinally of the shell and substantially fixed in position relative to the shell, a transverse partition in the shell and spaced from said tube, and a support bracket fixed to the tube and to the partition whereby said tube supports said partition in a substantially fixed position.