| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous hole drilling machine capable of reducing removal operation of a guide rod, when forming an independent single hole, by largely forming an outside diametrical dimension of a guide rod for guiding a drilled hole by a hole drilling bit inserted into a preceding hole. SOLUTION: This guide rod 5 is formed by positioning the front end in front of the hole drilling bit 3, and is arranged by slidably penetrating through a rod guide in a state of projecting the rear end backward from the rod guide 6, and is constituted so that a stopper 9 is arranged on the guide rod rear end for regulating extraction of the guide rod from the rod guide, and a sliding regulating means of the guide rod is arranged between a rod guide outer peripheral surface and a rod guide inner peripheral surface for penetratingly arranging the guide rod, and the guide rod slides backward to the rod guide after the front end of the guide rod reaches the tip of the preceding hole P. COPYRIGHT: (C)2007,JPO&INPIT
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