摘要:
An impact element (40) is provided and includes a single body (41) drivable into an external element by force acting on a piston head (22). The single body (41) includes a head (42) and a shaft (43) having a first end (431) integrally coupled to the head, a second end (432) opposite the first end and a central portion (433) interposed between the first and second ends. The second end (432) of the shaft (43) is operatively connectable with the piston head (22) to define a joint located remotely from the head (42). The first end (431) of the shaft (43) has a trailing portion (4311) with a diameter similar to that of the central portion (433), a leading portion (4312) with a diameter similar to that of the rear end of the head (42) and a taper (4313) from the trailing portion (4311) to the leading portion (4312).