|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||181/227; 181/247; 181/249; 181/250; 181/255; 181/266; 181/269; 181/272; 181/273; 181/276; 181/282|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 5 인용 특허 : 8|
A cylindrical shell main body constituting a muffler main body is formed of two layers of an inner shell and an outer shell and has a cylindrical shape with a cross section that is not a perfect circle but is defined by alternated small arc portions and large arc portions similarly to an oval, or the like. The outer shell of the shell main body has, in each of their small arc portions, four radially projecting beads continuously extending in a circumferential direction along the small arc portions and being a predetermined distance apart from one another...
What is claimed is: 1. A shell main body for muffler, wherein the shell main body is made of one rolled flat plate and a joint portion of the plate is welded, the shell main body comprising: an inner shell formed by a part of the plate to have a cylindrical shape with a cross section that is not a perfect circle but is defined by small arc portions alternating with large arc portions; and an outer shell formed by another part of the plate that continues from a portion of the inner shell to wrap an outer surface of the inner shell and having a cylindrica...