Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1978-03-22
1980-06-03
Crane, Daniel C.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29445, 295272, 138145, 264269, 264295, B23P 1500, B29D 2300
Patent
active
042054206
ABSTRACT:
A process is disclosed for making a bent metal tube having a metal-ceramic liner for thermally and acoustically insulating the tube. A generally straight metal tube is first lined with a metal grid before bending the tube to a desired shape. Heating of the grid and a ceramic slurry coated thereon forms the slurry into a monolithic ceramic body with the metal grid embedded therein so that the resultant liner provides a durable thermal and acoustic insulation for the tube. Insulated tubes for internal combustion engine exhaust systems are advantageously made by this process with the liner positioned within the tube to provide heat conservation, lower under-hood temperatures, lower noise, and longer tube life as well as allowing the use of lower grade and lighter gauge metal for the tube. The ceramic slurry is disclosed as being coated on the grid before the grid is inserted into the tube, after the insertion but before the bending, or after the insertion and the bending. The slurry can also be air or heat dried to a semi-viscous condition and still thermally and acoustically insulate the tube.
REFERENCES:
patent: 1892433 (1932-12-01), Huff
patent: 2614058 (1952-10-01), Francis
patent: 2962051 (1960-11-01), Burkes, Jr.
patent: 3060069 (1962-10-01), Sindars
patent: 3289703 (1966-12-01), Brown
patent: 3401442 (1968-09-01), Matheny
Crane Daniel C.
Repwell Associates, Inc.
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