| 摘要 |
<p>A maintenance cover (24) comprises a central turning support part (106) and a pair of lateral turning support parts (104) disposed at the left and right sides of a front edge part (24a). The lateral turning support parts (104) comprise an opening part (110) which may be locked to a hook part (108) that has an L-shaped cross section and is disposed in a cover main body part (22). The central turning support part (106) comprises a locking part which may be locked to an inner wall surface of a side wall part (112) disposed in the cover main body part (22). When the maintenance cover (24) is slid backwards, the sliding motion of the maintenance cover (24) is locked by means of the lateral turning support parts (104) and the central turning support part (106), and the maintenance cover (24) is turned with the lateral turning support parts (104) serving as support points.</p> |
