| 摘要 |
PURPOSE:To reduce the number of part items, reduce the cost, and obviate troublesomeness of installation work and avoiding during out of service constituting obstruction for a ladder to be accommodated in ceiling when it is in service. CONSTITUTION:A ladder 3 to be accommodated in the ceiling is equipped with a left and a right lateral board 31, 31 and installed on a lid 2 to a ceiling opening 1, and slide rails 41, 41 are mounted on these lateral boards in such a way as extending in the ladder longitudinal direction. On these slide rails 41, 41, sliders 42, 42 are fitted with possibility of sliding, and an elevating/sinking drive device 5 is coupled with the sliders 42, 42. Between them an object placing table 43 is installed in such a way as revolving between the accommodation position, in which it is laid over one of the step boards 32 provided crosswise between the lateral boards 31, 31, and the placing position for objects in which it is separated from the step board 32 and held protrusively on the in front of the ladder. |
