| 摘要 |
<p>The blade tip (3) has two projections (31, 32) on the rear side. These are spaced apart from each other along the direction of working, and project toward the shaft (1). The projections are inserted into recesses (23, 41; 42, 52) which are provided in the shaft. A device (5) is included for locking the tip in position, when coupled with the shaft. This comprises a recessed (52) formation, into which one of the two projections is inserted. A pivoted spring-loaded lever (6) holds the tip on the shaft, when it is coupled-on.</p> |
