| 摘要 |
A deformable plastic self-locking fastener is disclosed comprising an upper head portion having an internal passage therethrough with a plurality of serrations formed on a portion of the surface of the internal passage. Tie strips are also integrally appended to the lower surface of the upper head portion and enclose at least a part of the serrations on the upper head. The tie strips have a predetermined taper or score line to permit the ties to collapse during operation. A lower member, preferably tubular in form, has an internal passage in axial alignment with the internal passage in the upper head portion and is connected to the upper head portion by the tie strips. Serrations, complementary to, and in axial alignment with the serrations in the upper head portion, are formed on the exterior of the lower member so that when a screw is inserted into the fastener and advanced therein, the lower member is drawn towards said upper head portion by the collapsing and folding of the tie strips with the fastener self-locking by the two groups of serrations interlocking.
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