Claims
- 1. A method for manufacturing a silencer with sound-absorbing material being filled in a space between a multi-perforated inner tube and an outer tube, which comprises steps of:
- a) winding on and around outer peripheral surface of said multi-perforated inner tube a long web of mat-shaped sound-absorbing material in multiple layers and to a predetermined thickness:
- b) then, gradually bringing a pair of levelling members, each having a semi-arcuate concavity which is substantially eqaul to the inner diameter of the outer tube, into contact with the outer peripheral surface of the sound-absorbing material, while rotating the inner tube with the sound-absorbing material, in the winding direction, to thereby substantially level the outer diameter of the sound-absorbing material to the inner diameter of the outer tube; and
- c) inserting the inner tube into the outer tube, while continuously rotating the inner tube.
- 2. A method for manufacturing silencer as set forth in claim 1, wherein, after insertion of said inner tube in said outer tube to a predetermined position, said inner tube is caused to rotate in the direction opposite to the winding direction of said sound-absorbing material.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-115446 |
Apr 1993 |
JPX |
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Parent Case Info
This is a divisional of copending application Ser. No. 08/228,035, filed on Apr. 15, 1994.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
228035 |
Apr 1994 |
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