Metal working – Means for forming clench-tongue
Patent
1994-08-11
1997-04-08
Gorski, Joseph M.
Metal working
Means for forming clench-tongue
292435, 30366, 72325, B23P 1900
Patent
active
056176198
ABSTRACT:
A rivet fastening apparatus and method for joining two pieces by forming a rivet from the material of the pieces. First and second dies are used and the second die is moved into the first die to form a punched out hole and circumferentially spaced tabs in the pieces. The position of the dies are reversed relative to the pieces and the second die is advanced into the first die a second time so that a portion of the second die gives a radially outward direction to the tabs and another portion of the second die flattens the tabs against one another and against an outer face of one of the pieces to form a rivet head. One second die is shaped to form a round hole and four tabs and another second die forms a triangular hole with three tabs. Another embodiment has a punch rod in the first die that forms a smaller hole that is enlarged by a second die with a center through hole that receives the punch rod.
REFERENCES:
patent: 216912 (1879-06-01), Torrans
patent: 1176793 (1916-03-01), Tuttle
patent: 2333966 (1943-11-01), Weiss
patent: 3261073 (1966-07-01), Klenk
patent: 3505714 (1970-04-01), Boileau
patent: 4306511 (1981-12-01), Ashby et al.
patent: 4391037 (1983-07-01), Giasini
patent: 5231748 (1993-08-01), Knudson et al.
Gorski Joseph M.
Lewis, Jr. Ancel W.
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