| 摘要 |
PURPOSE:To ensure satisfactory efficiency for connecting work, and to eliminate undesirability of increase in the number of component parts. CONSTITUTION:A support 17 is arranged to the underside 15d of the connecting end face 15b of a halfpace unit 15. An upper stairs unit 14 is fixed to the halfpace unit 15 with the edge on its lower end 14a connected to the end face 15c of the halfpace unit. A connecting plate with a part 20 approximately flat is provided to the end of the halfpace unit 15, and a guide pin 22, projecting upward for insertion into a guide hole formed to the underside 14e on the lower end 14a of the upper stairs unit 14, is provided for positioning. |
