| 摘要 |
PROBLEM TO BE SOLVED: To provide a lock mechanism for reducing looseness between an engagement projection and an engagement hole. SOLUTION: Engagement of the lock mechanism 20 is performed in such a manner that an engagement piece 21 is bent when abutting the engagement projection 26 and goes over the engagement projection 26, then is restored to let the engagement projection 26 fit into the engagement hole 22 provided in the engagement piece 21. Because the front end in the engagement side of the engagement hole 22 has two oblique lines 24, 24 inclined in opposite directions from each other, and the edge of the engagement projection 26 opposed to the oblique lines 24, 24 has two inclined surfaces 28, 28 parallel to the oblique lines 24, 24 , even if the engagement hole 22 and the engagement projections 26 make relative movement in oblique directions from each other, the inclined surfaces 28, 28 abut the oblique lines 24, 24 to prevent looseness from generating between the engagement hole 22 and the engagement projection 26 , other than the space LO which is functionally needed by the lock mechanism 20 for the engagement piece 21 to go over the engagement projection 26 for locking. COPYRIGHT: (C)2005,JPO&NCIPI
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