| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fall accident of a worker riding on a scaffold and the disabling of the ascent/descent of the scaffold, on ground that the fall accident of the worker riding on the scaffold and the disabling of the ascent/descent of the scaffold are sometimes caused because a top plate body and a bottom plate body are tilted due to a collision with a protrusion on the pit wall in the vertical pile, in the case where the conventional scaffold formed of a circular plate having the top plate body and the bottom plate body, corresponding to the circular cross-section dimensions of a vertical shaft, ascends/descends in the vertical shaft. SOLUTION: This scaffold ascendable/descendable in the vertical shaft is characterized in that a lower portion in a front position during descent into the vertical shaft and an upper portion in a front position during ascent from inside the vertical shaft are formed in a tapered shape. COPYRIGHT: (C)2011,JPO&INPIT
|
