| 摘要 |
The connecting piece has an axial extension part, which is connected to the blade (3) upper long edge (31). The common axis (26) of the connecting piece and the connecting part meets the blade lower long edge (32) at a position (37) which approximately corresponds to the half length of the blade. The first extension part (25) of the connecting piece also has a second connecting part (23) which extends from a point on the connecting piece (2), which lies at a distance from the blade, to the rear end part of the blade upper long edge. The connecting piece has an opening (38) between the two parts and the blade upper long edge. The axis (26) of the connecting piece forms an angle of 130 plus or minus 20 degrees with the blade longitudinal central axis (35). |
