REAMER SCREW AND BUILDING PANELS ERECTED WITH REAMER SCREWS

摘要

A reamer screw having an elongated shank, with a leading end and atrailing end, at opposite ends, and having a self-tapping/cutting thread at theleading end for self-tapping and cutting an opening through a workpiece, anddriving securely into a substrate, a torque formation at the trailing end forengagement by a suitable driving tool for the single function insertion of thescrew into the workpiece and into the substrate, in a single operation, asmooth shank extending between the thread and the trailing end and havinga length sufficient to extend through the workpiece, driving in of the threadthrough the workpiece, releasing the workpiece allowing the thread to betightened up in the substrate, while the smooth shank rotates freely in theworkpiece permitting the workpiece to be drawn snugly against the substratewithout binding in the workpiece, and reamer formations formed byoutwardly extending wing portions of the smooth shank, located betweenthe thread and the trailing end, the reamer formations reaming an enlargedopening in a workpiece, to form a thermal expansion/contraction spacebetween the workpiece and the shank, the wing portions being spaced alongthe shank from the torque formation a distance greater than the thickness ofthe workpiece.