Blind hole integral rivet
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 28, 1993
Grant Date -
N/A
app pub date -
Jun 29, 1992
filing date -
Jun 29, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of forming blind hole rivets by displacing metal from a relatively thick base metal includes positioning a die against one side of the base metal having a cavity mating with the projection. A tool having a reduced diameter forward portion is pressed into the base metal from the side opposite the die to forward extrude metal into the die cavity during an initial portion of tool penetration. The end portion has a diameter substantially less than the diameter of the die cavity. Rearwardly of the end portion, the tool provides a cylindrical rearward portion having a diameter substantially equal to the diameter of the die cavity. After the forward portion penetrates into the base metal, the rearward portion penetrates the base metal and completes the displacement of material into the die cavity. The height of the rivet or projection can be at least about equal to the original thickness of the base metal without producing cracks or fractures.
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