Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1976-08-26
1984-11-20
Combs, E. Michael
Metal working
Method of mechanical manufacture
Assembling or joining
29 211, 29509, 29521, 29798, B23P 1900
Patent
active
RE0317373
ABSTRACT:
To fasten together two or more overlying sheets of metal or other material having plasticity or deformable properties by partially piercing and deforming sections of the sheets, a fixed pierce-and-forming punch is used in cooperation with a double-acting press having two separately actuatable rams. For displacing sections of the overlying sheets, one of the rams carries a hollow cylindrical pierce-and-forming die the die cavity of which is vertically aligned with, and cooperates with, a fixed pierce-and-forming punch supported in the base. The other of the rams carries a flattening punch which is slidably movable within the central bore of the hollow cylindrical die. The pierce-and-forming die is supported by means which includes fine adjustment means so that the position of the die may be adjusted for different thicknesses of sheets to be fastened, and also for wear on the die and/or punch. The flattening punch is supported by phase adjustment means which permits the angular relationship between the flattening punch and the die to be adjusted for different thicknesses of sheets to be fastened. The latter adjustment is made such that the downwardly-moving flattening punch engages the upper displaced section or sections just after the lower displaced section is uncovered by the upwardly-moving cylindrical die, thereby to spread the lower displaced section while the upper section or sections are still constrained.
REFERENCES:
patent: 318221 (1885-05-01), Thompsen et al.
patent: 2254558 (1941-09-01), Williams
patent: 2688890 (1954-09-01), Williams
patent: 2713197 (1955-07-01), Schmidt
patent: 2924312 (1960-02-01), Williams
patent: 3599318 (1971-08-01), Behlen
patent: 3726000 (1973-04-01), Hafner
patent: 3771216 (1973-11-01), Johnson
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