| 摘要 |
<p>PURPOSE:To prevent unlocking even in the lateral direction by forming recesses and protrusions for second locking in the inner face of the peripheral wall of an outside case and on the outer face of the peripheral wall of an inner case. CONSTITUTION:When an upper case 12 is applied to a lower case 11 and the recess and protrusion 11b, 12b for first lock are engaged vertically each other, both cases 11, 12 are locked vertically so that they are not removed in the direction B(upper direction) opposite to the applying direction while at the same time recess and protrusion 11d, 12d for second lock are also engaged each other. The peripheral walls 11a, 12a of lower and upper cases 11, 12 are prevented from being bent outward and inward, respectively, in the lateral direction A through engagement of the recess and protrusion 11d, 12d for second lock in the lateral direction. In other words, the recess and protrusion 11b, 12b for first lock are locked not to be removed in the lateral direction A and thereby both cases 11, 12 are locked not to be removed in the direction A (lateral direction) and direction B (vertical direction).</p> |
