| 摘要 |
A novel clinch-type fastener member is engaged through first and second workpieces to form a mechanically locked joint which is highly resistant to vibrational loosening. The fastener member has a first portion and a second portion defined by a shank portion which extends therefrom. The first portion has a protuberance, formed from a ring, thereon which extends outwardly therefrom. The shank portion has a projection, formed from a ring, spaced a predetermined distance from the first portion to define a retaining groove. To engage the fastener member with the workpieces, the fastener member is rotated into engagement therewith. The protuberance on the first portion engages a top surface of the first workpiece and rotational and compressive forces are applied to the fastener member thereby causing the protuberance to deform the first workpiece material to cause the material to flow into the retaining groove provided of the fastener member. The projection on the shank portion generally contacts the first workpiece such that when the deformed material flows into the retaining groove, the deformed material is captured between the projection and the first portion.
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