| 摘要 |
<P>PROBLEM TO BE SOLVED: To position an engaging protrusion at an attachment position by only inserting it into a wall hole. <P>SOLUTION: A pair of engaging protrusions 26 to be respectively engaged with circular arc parts facing on the long side of a wall hole W2 in an inner peripheral surface of the wall hole W2 are provided on surfaces 221 and 231 of an upper frame portion 22 and a lower frame portion 23. Also, each of the engaging protrusions 26 is inserted into the wall hole W2 while a whole side surface on the opposite side of each boss part 25 in each of the engaging protrusions 26 is positioned along each of the circular arc parts facing on the long side of the wall hole W2 in the inner peripheral surface of the wall hole W2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
