| 摘要 |
<p>An improved digging point assembly comprises a holder (10), a blade member (20) and a digging tip member (30) connected in series. The blade member is constructed such that, when partially worn, it can be used as a tip member on a fresh blade member. The tip can be allowed to wear out completely and the blade can also be allowed to wear until damage to the holder is imminent. The worn blade member is then used as a tip on a fresh blade member, and the cycle repeated.</p> |
