| 摘要 |
PROBLEM TO BE SOLVED: To provide a conveyance device capable of safely and efficiently conveying an object of conveyance according to the present invention.SOLUTION: A drilling machine lifting device 60 comprises a guide rail 90 and a lifting machine 110. The guide rail 90 comprises a plurality of guide rail units 91, 92 and 93 which are arranged in series leaving gaps therebetween. The lifting machine 110 comprises a frame 120 traveling along the guide rail 90, a plurality of pinion gears 135, 136, 137, 138, 139, and 140 supported rotatably on the frame 120 in a linear array, and meshing with rack gears 91b, 92b, and 93b of the guide rail units 91, 92, and 93, and an electric motor 133 provided to the frame 120, and has at least one combination of two pinion gears, having inter-rotational-center distances larger than a maximum gap among gaps between the guide rail units 91, 92, and 93, among the plurality of pinion gears 135, 136, 137, 138, 139, and 140.SELECTED DRAWING: Figure 2 |
