| 摘要 |
A clinch joint of the leak proof type and method and apparatus for forming several joint embodiments is disclosed. The joint retains overlapping sheets of deformable material together by simultaneously drawing nested cup-shaped cavities formed out of the plane of the sheets having a central spot and a continuous wall region extending from the spot to the cavity periphery. The region of the sheets adjacent the cavity periphery is pinched together causing the cavity walls to inwardly radially deform, securely interlocking the sheets firmly together. Alternative embodiments of the joint additionally squeeze the cavity spots together outwardly radially deforming the spot material to further interlock the nested cavities.
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