| 摘要 |
PROBLEM TO BE SOLVED: To reduce possibility of a chisel to jam in a material.SOLUTION: A chisel 1 includes a striking surface 4, a shank 8, a spreading element 12 and a tip 3, successively disposed along a central axis 2 in a striking direction 7. The spreading element 12 has multiple ribs 13 around the axis 2 extending along the axis 2. The ribs 13 each have a wave shape formed through a tangential deflection with respect to the axis 2. |
