Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1977-08-01
1979-02-20
Kelly, Donald G.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181269, 181275, 181296, 228155, 228173R, F01N 106
Patent
active
041402049
ABSTRACT:
There is disclosed a muffler for an internal combustion engine, particularly an automobile engine, which includes a heavy steel outer casing formed from a section of cylindrical tubing together with an internal baffle structure of two sections of smaller diameter cylindrical steel tubing at least one of which is perforated to create a plurality of louvered openings extending along and around the tubing section. Each of the tubing sections has an end that is offset by reason of a pair of opposite-direction bends in the tubing, and the offset ends of the two sections of tubing are overlapped and joined together by welding or other suitable means to produce an extended baffle structure of approximately the same length as the outer casing. The offset ends of the sections of tubing which are joined together are preferably flattened on the sides adjacent to each other to reduce the maximum dimension of the baffle structure along the portion thereof where the two tube sections overlap. The muffler is preferably arranged with the louver openings in the perforated section in a direction counter to the flow of exhaust gases. The muffler is fabricated from readily available perforated and unperforated tubing by relatively simple metal forming equipment such as pipe bending machines and tube-doming die presses available to muffler and exhaust pipe replacement shops. Pipe bending machines are used to form the baffle structure as above described, and it is enclosed within the outer casing by doming the ends of the casing tubing in a doming die press, after which the ends of the baffle structure are secured in the reduced size openings in the end of the casing by welding.
REFERENCES:
patent: 2675088 (1954-04-01), McLeod
patent: 3003578 (1961-10-01), Ewashuk
patent: 3043393 (1962-07-01), Hopkins
patent: 3191715 (1965-06-01), Jettingoff
Gator Products, Inc.
Keegan Robert R.
Kelly Donald G.
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