| 摘要 |
An electrical portable percussive-drilling machine possesses a reciprocating drive piston for impinging a tool, for example a percussive drill, a countershaft driveable by means of a motor shaft and an angle lever pivotably attached to a fixed pivot pin and having a first arm, rotatably attached to the countershaft and extending obliquely with respect to the longitudinal axis of the countershaft, and a second arm extending substantially at right angles to the first arm and seated slideably in a slot in a parallel pin accommodated in the drive piston. Upon rotation of the motor shaft, the first arm is caused to rotate along a conical surface, and the second arm is compelled into a pivoting movement in order to move the drive piston back and forth. The first and second arm can be designed so as to protrude in one piece from a central eye bead connected to the pivot pin via a ball joint. In another embodiment, the first arm possesses two ring eyes slideably fitted over the second arm on both sides of the pivot pin.
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