Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1977-04-25
1978-09-12
Larson, Lowell A.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
113118C, 219102, 228160, 228183, 165171, 126271, B23P 1526
Patent
active
041125665
ABSTRACT:
Methods for manufacturing heat exchange panels each comprising metal tubes of finite length welded to a metal sheet except at the end portions of the tubes which are secured to headers in fluid-tight relation thereto, in which methods the metal sheet, having end edges and side edges, is formed into a hollow cylinder with the end edges adjacent each other and metal tubing is welded to the cylinder in a spiral path. Welding is interrupted adjacent the end edges and the tubing is cut above the end edges to provide tubes welded to the cylinder except at end portions of the tubes. The end portions of the tubes, after the cylinder-tube combination is formed to the desired shape, e.g., flat, are secured to the headers. If tubes parallel to the side edges of the sheet are desired, the hollow cylinder is formed with adjacent portions of the side edges in axially offset relation prior to welding the tubing to the cylinder.
REFERENCES:
patent: 2091584 (1937-08-01), Brown
patent: 2202756 (1940-05-01), Cline
patent: 2208789 (1940-07-01), Cally
patent: 2376762 (1945-05-01), Ferguson
patent: 2821619 (1958-01-01), Rudd
patent: 3229765 (1966-01-01), Phillips
patent: 3319040 (1967-05-01), Rudd
Allen Richard J.
DuBosque, Jr. Clayton
Rudd Wallace C.
Crane Daniel C.
Larson Lowell A.
Thermatool Corp.
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