| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily handle a maintenance cover during maintenance work by reducing the weight of the maintenance cover. Ž<P>SOLUTION: The maintenance cover 23 mounted to a floor member 13 to cover respective maintenance openings 13C, 13D is composed of: a central bent plate 24 having projecting parts 24B; a left side bent plate 25 having a rising plate part 25B and the like; a right front side bent plate 26 having a rising plate part 26B; and a right rear side bent plate 27 having a rising plate part 27B. The maintenance cover 23 is formed as a three-dimensional structure with recessed and projecting bent parts. Since the maintenance cover 23 can thereby be enhanced in rigidity to bending load or the like with the three-dimensional structure, its plate thickness can be thinned to reduce weight compared with a thick-walled maintenance cover having equivalent rigidity. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž</p> |
