Improved method for fabricating a muffler

Metal working – Method of mechanical manufacture – Muffler – manifold or exhaust pipe making

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Details

29428, B23P 1500

Patent

active

055795773

ABSTRACT:
A vehicular exhaust system muffler fabrication method including using mechanical lock joints for joining the end tubes to the flow tubes. Each end tube has one end whose outer diameter is selected such that the one end may be loosely, telescopically, and overlappingly fitted within the adjacent end of the adjacent flow tube. Each of the overlapped ends of the end tubes and the flow tubes are mechanically locked together by a circumferential skewed bead which is formed in the overlapped ends, with the plane of the skewed bead being at an angle less than 90.degree. with respect to the central longitudinal axis of the overlapped ends. The muffler fabrication method also includes the use of other mechanical lock joints to lock the end tubes within apertures in the end panels of the muffler. Each of these other lock joints includes a continuous, circumferential bead formed in the end tube and in the annular flange, which is integral with the end panel and which extends along the end tube. A series of spaced apart, circumferential, aligned elongated deformations are formed in the overlapped portion of the end tube and the flange.

REFERENCES:
patent: 3107748 (1963-10-01), Placek
patent: 3498407 (1970-03-01), Straw
patent: 3613830 (1971-10-01), Hubbell, III
patent: 3841435 (1974-10-01), Hetherington
patent: 4486932 (1984-12-01), Hall
patent: 4547942 (1985-10-01), Fukuda
patent: 4689952 (1987-09-01), Arthur et al.
patent: 5398407 (1995-03-01), Stuer

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