| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve safety in boring work of a knock-hole by providing a wiring box with a knock out through-couplings, and providing it with a lock-hole with which a tool can engage, at the external surface of the knock out. SOLUTION: The removal structure 10 of a knock-hole is made on the wall face 9 of a wiring box, and here knock outs 3 are made integrally through two places of couplings 2 and 2 by which the knock out is coupled with the main body of the wiring box, and a lock hole 4 with which the tip of a tool can engage is made at the topside of the knock out 3. For the knock out 3, the lock hole 3 is made on the rotation axis, and rotating the other end of a minus screwdriver, in condition that its one end is inserted into the lock hole 4 of the removal structure 10 of the knock-hole, will enable a worker to rotate the knock out 3 in the vertical direction, with the couplings 2 and 2, by which the knock out is coupled with the section, where the extension of the lock hole in longitudinal direction crosses, of the brim of the knock hole, as the fulcrum. As a result, the knock out he can be cut off easily and finely from the brim of the knock-hole, thus improving the safely in boring work of the knock hole.</p> |
