Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1977-05-11
1978-10-17
Lanham, C.W.
Metal working
Method of mechanical manufacture
Assembling or joining
29525, 291568CF, 403248, 403274, 403360, B23P 1100
Patent
active
041200845
ABSTRACT:
A lug-and-hole connection between a first, lug-bearing sheet metal element and a second, apertured sheet metal element is made by so forming the hole in the first element that it is bounded by out-turned, opposite, convergent wall portions spaced apart, at the narrowest distance between them, by a distance slightly less than the lug thickness. The hole is made without removing material from the first element, as by forcing through it the wedge-shaped tip of a chisel-like punch while backing that element with a flat-topped die having cylindrical cavity. After the lug is inserted into the hole, a tip portion of the lug, which projects beyond the wall portions, is swaged to form it into a rivet-like head that snugly overlies the outer edges of the wall portions, but the wall portions are not reworked in the head forming operation.
REFERENCES:
patent: 964511 (1910-07-01), Goldie, Jr.
patent: 1609597 (1926-12-01), Arnt
patent: 2264897 (1941-12-01), Becker et al.
patent: 2302095 (1942-11-01), Bartch
patent: 2302501 (1942-11-01), Mears
patent: 2908418 (1959-10-01), Gallay
patent: 3571909 (1971-03-01), Stern
patent: 3911516 (1975-10-01), Einhorn
Crane Daniel C.
Jones Ira Milton
Lanham C.W.
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