| 摘要 |
<p>A key including a body having a first end, a second end and an axis is disclosed. The axis extends through the first and second ends. A toothed portion is adjacent to the first end, and a coupling portion is adjacent to the second end. An insertion portion has non-circular cross sections perpendicular to the axis and located intermediate the toothed portion and the coupling portion. The non-circular cross sections include at least one linear side and at least one arcuate side. The at least one arcuate side adjoins the at least one linear side and extends along a circular path. The body between the first end and the insertion portion and between the second end and the insertion portion has a radial extent from the axis less than or equal to the non-circular cross sections of the insertion portion.</p> |
