| 摘要 |
<P>PROBLEM TO BE SOLVED: To turn a door of a land charnel to a hard-to-break and easy-to-repair structure. <P>SOLUTION: A circular cross sectional part 7a is formed along a lower side of a door 7. On an upper surface of a doorsill member 11, a semicircular groove 11a suited to the circular cross sectional part 7a is provided in a longitudinal direction. By fitting the circular cross sectional part 7a at the lower side of the door to the semicircular groove 11a of the doorsill member, the door 7 is freely rotated, a charnel opening 5 is closed when the door 7 is raised, and the charnel opening is opened when the door is brought down to the front. <P>COPYRIGHT: (C)2013,JPO&INPIT |
