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:
Oct. 31, 1995
Filed:
Apr. 15, 1994
Tsukasa Ikeda, Ohmiya, JP;
Akihiko Tamano, Ageo, JP;
Sankei Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
The invention is directed to a method for easy and reliable manufacture of a silencer constructed with a multi-perforated inner tube and an outer tube, between which a sound-absorbing material such as glass wool, etc. is filled in, without use of a binding agent, etc. The invention is also directed to provide an apparatus for use in the manufacture of such silencer. In these method and apparatus for manufacturing the silencer, a long web of mat-shaped sound-absorbing material S is wound on and around the outer peripheral surface of the multi-perforated inner tube 1 in multiple layers and to a predetermined thickness; then, a pair of levelling members 2A, 2B, each having a semi-circular concavity which is substantially equal to the inner diameter of the outer tube, are gradually brought into contact with the outer peripheral surface of the sound-absorbing material S, while rotating the inner tube T1 with the sound-absorbing material S having been wound therearound, in its winding direction, to thereby level the outer diameter of the sound-absorbing material S to the inner diameter of the outer tube to a substantially equal degree; and the inner tube T1 is inserted into the outer tube T2 immovably fixed by the outer tube fixing means such as clamps 3A and 3B, while continuously rotating the inner tube T1.