PROBLEM TO BE SOLVED: To perform locking simply and exactly by cutting up one part of the cover plate of the side part of a case to the back side so as to provide a restraining tongue piece, and fastening and fixing the cover plate to the case under the condition in which the back of the restrainig tongue piece is brought in contact with one side of a hexagon nut. ;SOLUTION: The fixing main body 5 of a lock 4 is fitted in the fitting hole of the front wall part 2 of a case 1 from the front side, a hexagon nut 7 is fitted to the threaded cylinder part 5a of the main body 5, and the front wall part 2 is pinched between the head part of the main body 5 and the nut 7. Next a restraining tongue piece 9 is cut up on the cover plate 8 for the side of the case 1 to the back side, and the cover plate 8 is fastened and fixed with the case by screws 6 under the condition in which the back 9a of the restraining tongue piece 9 is brought in contact with the one side 7a of the nut 7. Hence, a locking work to be executed inside the case 1 is eliminated, it is unnecessary to add a bulky locking member to the device, and even when a surplus space does not remain inside the case 1, locking process of the nut 7 can be executed simply and exactly.;COPYRIGHT: (C)1998,JPO
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