Patent ID: 7325474

Claim:
A silencer comprising: a casing cylinder; a plurality of abutting segment members laminated and housed in said casing cylinder to constitute a sound reducing means, wherein each of said segment members comprises a segment cylinder and at least two segment plates forming a hard structure, wherein said segment plates are punched plates having a punched hole concentric with the cylinder axis of the respective segment cylinder, and a peripheral part of each said punched plate is continued to an end of the respective segment cylinder, and sound absorbing material that is softer than the hard structure provided within the hard structure; a segment member fastening means for fastening said segment member to said casing cylinder; a gas inlet-side lid plate for closing an opening at one end of said casing cylinder, said gas inlet-side lid plate having a punched hole; and a gas outlet-side lid plate for closing an opening at the other end of said casing cylinder, wherein at least one of said gas inlet-side lid plate and said gas outlet-side lid plate is adapted to be detachable from said casing cylinder.