| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent deformation of a front cover accompanying the fastening of a fastening screw by forming a tool insertion hole passing through from obverse to reverse at a front cover, and forming a screw hole in the base part opposed to the tool insertion hole. SOLUTION: The coupled unit of a front cover 1 and a base 2 is abutted against the wall W from the inside in such mode that it covers the wall hole H bored in the wall, corresponding to the lining member 3 set in advance at the rear of the wall board W. In this condition, the fastening screw 5 inserted from the tool insertion hole 15 is set in the screw insertion hole 24, and the tip is screwed into the screw hole 31 of the lining member 3. And, tightening a fastening screw 5 with a driver inserted from the tool insertion hole 15 will draw the base 2 and the lining member 3 to each other, whereby the wall board W is caught with the base 2 and the lining member 3. At this time, in the case that the constituent wall of the base 2 in the vicinity of fastening part is deformed by the tightening of the fastening screw 5, the deformation is hard to be transmitted to the front cover 1 through the engaging part between the base 2 and the front cover 1 because the front cover 1 and the base 2 are separate parts.</p> |
