| 摘要 |
<p>The tool (30) has a main body (31) terminated by a hook (32), where a washer (10) is placed at an end of the main body at an angle (alpha) with respect to vertical direction such that the washer pivots in contact with a bearing surface (21) on a workpiece (20) and located on the bearing surface of the workpiece by gravity during lowering the tool. The hook is pivotally mounted on the main body such that the hook is pivoted about an axis (33) to facilitate disengagement of the tool when the hook is released from weight of the washer.</p> |
