The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2001
Filed:
Jul. 30, 1999
Akinobu Morikawa, Nishikamo-Gun, JP;
Sango Co., Ltd., Nagoya, JP;
Abstract
A muffler is constructed by inner and outer pipes, in which opposite end portions of the outer pipe are reduced in diameter, a welding portion of the inner pipe is accurately formed, and in this muffler, in order that a welding portion of the inner pipe can be accurately formed and that the outer pipe can be reduced in diameter uniformly over an entire periphery thereof to compress a buffer member uniformly over an entire periphery thereof, the inner pipe (,), having the buffer member (,) fitted on one end portion,thereof, is held within the outer pipe (,), held in position, in such a manner that a predetermined gap is formed between the inner and outer pipes (,) and (,). Subsequently, a diameter of the other end portion (1,) of the outer pipe (,) remote from the buffer member (,) is reduced, thereby fixedly securing this other end portion to the other end portion,of the inner pipe (,). Subsequently, a spinning processing is applied to one end portion (,) of the outer pipe (,), thereby reducing a diameter of this one end portion until this one end portion (,) is brought into contact with the buffer member (,), and further radially compresses the buffer member (,).