| 摘要 |
PROBLEM TO BE SOLVED: To position at a mounting position by simply inserting an engaging protrusion into a wall hole.SOLUTION: On surfaces 221 and 231 of an upper frame 22 and a lower frame 23, engaging protrusions 26 for engaging, respectively, with arc portions facing each other on a long side in a wall hole W2, are provided on an inner peripheral surface of the wall hole W2. While adjusting a position so that the entire side of each engaging protrusion 26 on a reverse side of each boss 25 spreads along the arc portions facing each other on the long side in the wall hole W2, on the inner peripheral surface of the wall hole W2, each engaging protrusion 26 is inserted into the wall hole W2.SELECTED DRAWING: Figure 5 |
