| 摘要 |
A second wall (34) has an opening (48). When an engagement projection (64) has climbed the inclined surface (43a) of a lock projection (43) and is going to reach the top of the lock projection, the opening allows a pressing projection (65) to be slide contacted with its edge (48a) while pressing the edge, thereby giving a lock arm a pressing force opposite to the deflecting direction thereof. |
