To provide a stepped hole working tool capable of boring a hole in a desired substrate without using any tool such as scissors and a hole saw, and simply and reliably opening a stepped hole by executing the stepping work in a circumferential edge of a hole.
The stepped hole working tool comprises: a fixed die 10 in which a die receiving part 12 is formed by recessing a base 11 while leaving a periphery of an upper surface of the base, a blade receiving part 13 is formed on the inner side of the die receiving part 12, and a supporting bar 15 with a pointed portion 14 provided on its fore end is erected on a center of the blade receiving part 13; a drilling pipe 20 to be inserted in the supporting bar 15; and a movable die 30 in which a die pressing part 32 projected leaving a periphery of a lower surface of a base part 31 behind and opposing the die receiving part 12 is formed, a blade part 33 is formed on the inner side of the die pressing part 32, and a through-hole 34 for allowing the supporting bar 15 to be inserted therein is opened in the center of the blade part 33.
NAKAGAWA MAKOTO
KURIOKA EIICHIRO
| JPS3910353Y1 | ||||
| JP2000312932A | 2000-11-14 | |||
| JPH04279226A | 1992-10-05 | |||
| JPH09201627A | 1997-08-05 |