| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an iron cover structure which prevents generation of a noise, which facilitates opening/closing of a cover, which reduces the weight of a cover, and which prevents a rolling phenomenon. <P>SOLUTION: In technological means for solving the problem, a cover receiving portion of a receiving frame is formed in a small-angle cone shape spreading out like an unfolded fan upward from an opening dimension; a large-angle cone shape with a diameter slightly larger than a diameter of the cone-shaped portion is constituted on a horizontal step portion; a corresponding cover body is similarly composed of a two-step cone shapes with the same angles; and a gap is provided in a horizontal plane of the step portion. <P>COPYRIGHT: (C)2012,JPO&INPIT |
