| 摘要 |
<p>A flange forming drill means for drilling a hole through the side of a pipe or the like and for forming a hole encircling flange. The drill means is provided with a drill rod (1) mountable on a rotating machine and fitted with a drill bit (4) and associated forming members (3) which, after the hole has been drilled, can be extended down below the edges of the hole by turning an adjustment member (2) fitted around the drill rod. The adjustment member (2) is enclosed in an externally smooth protective shield (7), which is in engagement (8, 9) with the adjustment member (2), so that their relative rotation around the drilling axis is eliminated. To the drill rod (1) is secured a locking means (16) to which the shield (7) and adjustment member (2) can be removably locked in various angular positions around the drilling axis. The locking means comprises a locking flange (16) provided with two holes or recesses (17, 18) defining the terminal positions of locking. In the first terminal locking position the forming means (3) lie completely within the outer face of the drill bit (4) and in the second terminal locking position the forming means (3) extend or project from the drill bit (4) so as to correspond to the desired internal diameter of the flange (11).</p> |
