| 摘要 |
PURPOSE: A work punching apparatus is provided to easily separate an adapter from a puncture bit by rotating the adapter in an opposite direction. CONSTITUTION: A work punching apparatus is as follows. A connecting shoe is installed to the bottom of a cylindrical casing. A puncture bit(30) is installed in the connecting shoe to rotate. A bonding groove(31) is formed on the center of upper surface of the puncture bit and is formed to protrude a pair of locking projection parts(32) to the inside of the sidewall of the bonding groove. A guideline extension part(34) is formed between the bottom of the locking projection part and a floor side(33) of the bonding groove. |
