| 摘要 |
The inner arm part (4) is rotatably connected at one end to the frame (2). At its free end is rotatably fitted the outer arm part (5). The free end of this latter arm part has a tool holder (8). The pivoting axis (6) of the inner arm part is at other than a right angle in relation to the rotary axis of the frame. That of the outer arm part (5) in relation to the inner arm part (4) is at right-angles to the longitudinal axis line of the inner part. It is at an angle other than a right angle to the pivoting axis (6) of the inner arm part (4) in relation to the frame (2). Preferably, the two pivoting axes angles should be equal in extent, i.e. 45 deg. |
