| 摘要 |
PROBLEM TO BE SOLVED: To suppress construction failure when fastening-fixing two conduits by a lock nut.SOLUTION: A lock nut 108 engages with a drain cylinder holding member 104. Packing is inserted between the lock nut 108 and a sink 102. The lock nut 108 is provided with one or more of ribs for confirming a proper fastening quantity by a constructor when connecting the sink 102 and the drain cylinder holding member 104 by fastening the lock nut 108. When the constructor executes proper fastening, only the rib directly contacts with the lock nut 108, and a body of the lock nut 108 fixes the sink 102 via the packing. A part of the sink 102 is sandwiched by the lock nut 108 and a flange 110 of the drain cylinder holding member 104. The rib is a circular arc-shaped projection formed along the circumferential direction of the lock nut 108. A memo is written on the lock nut 108 for indicating to the constructor so as to fasten until the rib abuts on the sink 102. |
