| 摘要 |
PROBLEM TO BE SOLVED: To provide a pulley solving the drawback that since a pulley which moves while hung from a rope connecting columns stood successively is caught by a joint between a column and the rope and then disabled to move when crossing the column during its movement, the pulley should re-hung at each time to further move.SOLUTION: At one end of a side face of an axle frame (1) consisting of four sides of a pulley, an opening/closing blade (2) for crossing a column arm (3) as a joint of a rope is provided, and then the pulley moves onto a pulley guide bar (4) mounted on the column arm and crosses the column while flipping up the opening/closing blade to the right and left.SELECTED DRAWING: Figure 1 |
