| 摘要 |
<p>PROBLEM TO BE SOLVED: To mount an arm member on a main girder member easily and ensure the strength of the main girder member, thereby improving transportability and workability by forming a groove permitting a screw mounting the arm member to be screwed forcibly continuously in the longitudinal direction, so as to mount the arm member on the main girder member longitudinally. SOLUTION: An upper arm member 6 permits an upper rotation-stop member 8 to be fit in the center thereof and a screw to be inserted thereinto from the above and is screwed into a groove 2a to be mounted on the upper wall 3 of a main girder member 2. A lower arm member 7 permits a lower rotation- stop member 9 to be fitted in the center thereof and a screw to be inserted thereinto from below and is screwed into the groove 2a to be mounted on a lower wall 4 of the main girder 2. The main girder 2 is hung horizontally on hang bolts 11 hung from a ceiling at prescribed intervals longitudinally via a metal hanger 12. Accordingly, the arm member 5 can be mounted on the main girder member 2 with simple operations, increase the strength of the main girder member 2, and reduce the weight of a receiver 1, thereby improving transportability and workability.</p> |
