| 摘要 |
A screw for fastening two wooden members together which can be turned with a smaller force when the screw is driven into both two members so that the distance between the two members is easily and accurately adjustable. The screw includes a shank and a head provided at one end of the shank. The shank has a tip at the other end thereof, and includes a thread extending from an intermediate portion thereof to the tip, and an annular rib provided on the non-threaded portion of the shank. A tubular spacer having an axial slit is adapted to be rotatably fitted around the shank between the head and the annular rib. The spacer has an outer diameter greater than the outer diameter of the annular rib. The annular rib has an outer diameter smaller than the major diameter of the thread.
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