| 摘要 |
A reamer screw having an elongated shank, with a leading end and a trailing end, at opposite ends, and having a self-tapping/cutting thread at the leading end for self-tapping and cutting an opening through a workpiece, and driving securely into a substrate, a torque formation at the trailing end fo r engagement by a suitable driving tool for the single function insertion of t he screw into the workpiece and into the substrate, in a single operation, a smooth shank extending between the thread and the trailing end and having a length sufficient to extend through the workpiece, driving in of the threa d through the workpiece, releasing the workpiece allowing the thread to be tightened up in the substrate, while the smooth shank rotates freely in the workpiece permitting the workpiece to be drawn snugly against the substrate without binding in the workpiece, and reamer formations formed by outwardly extending wing portions of the smooth shank, located between the thread and the trailing end, the reamer formations reaming an enlarged opening in a workpiece, to form a thermal expansion/contraction space between the workpiece and the shank, the wing portions being spaced along the shank from the torque formation a distance greater than the thickness of the workpiece.
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