| 摘要 |
PROBLEM TO BE SOLVED: To configure opening and closing an opening part by turning an opening and closing cover along the surface of a plate-like member such as a bottom plate, and thereby enable two or more opening parts to be opened and closed by one opening and closing cover efficiently and further by a small plane space and operation labor.SOLUTION: Two opening parts 12a, 12b provided at an upper frame bottom plate 11 of an upper swing body are opened and closed simultaneously with one opening and closing cover 14 turned around a cover support shaft 13 along the surface of the bottom plate 11. The opening and closing cover 14 comprises cover parts 15a, 15b for individually opening and closing both opening parts 12a, 12b, and a narrow joining part 16 for connecting these. The cover support shaft 13 serving as a turning center is provided in the joining part 16 between both opening parts 12a, 12b while being positioned in the center O of a circle C.SELECTED DRAWING: Figure 3 |
