| 摘要 |
PROBLEM TO BE SOLVED: To accurately bore holes in a short time by simultaneously boring plural holes in boring. SOLUTION: A frame body 1 is moved to and arranged in a boring part to be fixed by suckers 2 in the four corners of the frame body 1. Afterwards, a driving part body 4 is moved to a tip side position of the boring part along a rail 3, a drill 7 is rotated by driving a motor 9, and the boring part 6 is moved downward along both sides of a support frame 5 to simultaneously bore plural holes in the floor surface. In this case, since the boring depth is set by an adjusting part 8, when the holes are bored up to the prescribed depth, rotation of the drill 7 stops so that the boring part 8 moves upward along both sides of the support frame 5 to stop in a former position. Afterwards, the driving part body 4 is moved to a position of the next boring part along the rail 3, and the driving part body 4 is stopped in the position by a pin to bore holes on the sides. Plural holes can be simultaneously and continuously bored by repeating in order.
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