| 摘要 |
PCT No. PCT/FI81/00006 Sec. 371 Date Sep. 24, 1981 Sec. 102(e) Date Sep. 24, 1981 PCT Filed Jan. 29, 1981 PCT Pub. No. WO81/02118 PCT Pub. Date Aug. 6, 1981.Flange forming drill apparatus for producing a flanged hole in a workpiece such as the side of a pipe or the like includes a body supporting a rotating drill rod and legs for supporting the body to move toward and away from the workpiece. A drill bit is provided at the end of the drill rod for drilling a hole upon movement of the body towards the workpiece along the support legs and a plurality of flange forming members are mounted on an end portion of the drill rod for movement between a retracted position while the hole is drilled and an outwardly projecting position for forming a flange around the edge of the hole when the body is moved away from the workpiece. An adjustment member on the drill rod is provided for moving the flange forming members between retracted and extended positions and brake bits are mounted on the legs for engagement by the adjustment member for extending the flange forming members when the hole is completed. A drive clutch assembly is provided for selective engagement with the rotating drill rod to automatically move the body away from the workpiece at substantially the same time that the flange forming members are extended to form a flange around the edge of the drilled hole.
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