Hammer for straightening steel plate in automobile body, has peen including conical portion that is narrowed for being connected at center of striking plate having straight section that is larger than that of parallelepiped portion

摘要

The hammer has a peen (1) including parallelepiped and conical portions (2, 5) on its respective sides, where the portion (2) is provided with a tap hole (3) in which a handle (4) is engaged. The portion (5) is narrowed for being connected at the center of a striking plate (6) having a straight section that is larger than that of the portion (2), where the plate is in rectangular, square or round shape. The plate is provided with a flat or bulged striking surface, where radius of curvature of the surface is smaller than maximum radius of curvature of elastic deformation of a steel plate.