| 摘要 |
A self-piercing rivet has a hollow deformable shank (10) with a piercing edge (11) for insertion into sheet material (14,A,B). A piercing end of the shank is covered by a cap (12, 30, 40, 50, 60 71) of material. The cap deforms around the shank and its piercing end as the rivet is inserted into the sheet material, and acts as a top layer of sheet material. This ensures that the piercing edge does not perforate the sheet material, enabling use of the rivet to join very thin sheets of material, or in tile case of a rivet stud, enabling its insertion into a single sheet of material.
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