| 摘要 |
<p>Apparatus for driving a pointed and headed fixing screw into a corrugated iron sheet (14) comprises a frusto-conical body (2) having windows (3). A driving shaft (4) is slidably and rotatably mounted in the upper end of the body (2) and protrudes upwardly from it. The protruding upper end of the shaft passes through a coiled compression spring (9) which urges the shaft upwards. The spring (9) is trapped between the upper end of the body (2) and a removable collar (16) fixed to the shaft (4). The lower end of the shaft (4) has a removable bit (11) attached to it. The underside of the bit (11) is formed with a socket to receive a head of a pointed steel screw which is held in axial alignment with the shaft axis. To use the apparatus a hand-held power tool has its chuck applied to the upper end of the shaft (4) so that the screw is magnetically held in a socket can be simultaneously rotated while being forced down into the sheet so that the screw simultaneously creates a hole in the sheet and screws the fixing screw into it. The fixing screw is held at right angles to the plane of the sheet (14) by the contour of the under rim (13) of the body (2) which is shaped to be complementary to the surface of the sheet at the position surrounding the desired location of the screw.</p> |
