| 摘要 |
PROBLEM TO BE SOLVED: To provide a tool for a chisel and/or a drill capable of optimizing sizing of a tool accompanied by comparatively slight impact energy, improving drilling efficiency and low in manufacturing cost. SOLUTION: This is a tool for a chisel and/or a drill, it has a tubular shaft 2, a drill head 5 is provided on one end part in the longitudinal direction of this shaft 2, the other end part of the shaft 2 in the longitudinal direction is connected to a connecting part 3 having an insertion end part 4, a through channel 8 extending in the axial direction is provided on the shaft 2, and a diameter is made d1 along most parts in length in the longitudinal direction of the connecting part 3, and the diameter d1 of this connecting part is made at most 1.6 times of a diameter d2 of the insertion end par 4 on the tool for the chisel and/or the drill opening this through channel 8 on a peripheral surface of the connecting part 3 through a lateral hole 7. |
