Apparatus and method to prevent rivet shanking

Metal working – Means to assemble or disassemble – Overedge assembling means

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Details

2924354, 227 51, B21D 3900, B23P 1102

Patent

active

052790240

ABSTRACT:
The apparatus includes a riveting assembly (10) which includes a rivet die (18) having a concave configuration which is brought into contact with one end of a rivet to be upset. The die (18) is driven into a rivet end by a rivet ram (16) a first time, resulting in an interference fit between the rivet shank and the part being riveted. When the die (18) is withdrawn, the newly formed rivet head will in some instances expand outwardly away from the surface of the part, leaving a gap between the formed end of the rivet and the part. A second strike assembly includes an L-shaped second strike element (28) which is moved between the die (18) and the rivet head. The ram (16) is then driven a second time, forcing the second strike element (28) against the formed end of the rivet, forcing the formed end of the rivet to flow outwardly and toward the part, resulting in the filling of the gap between the rivet head and the surface of the part.

REFERENCES:
patent: 3557442 (1971-01-01), Speller
patent: 3952401 (1976-04-01), Wagner
patent: 4749323 (1988-06-01), Sparling et al.
patent: 4864713 (1989-09-01), Roberts et al.
patent: 5050284 (1991-09-01), Howard et al.

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