| 摘要 |
PROBLEM TO BE SOLVED: To smoothly follow a movement of a liftable deck by keeping an interval between mutual cables in a state of housing a power feed cable in a fixed pillar without requiring manpower by vertically extending/contracting a spiral cable along a guide rod when vertically moving the liftable deck. SOLUTION: When a liftable deck 3 supported by a fixed pillar 1 is supported by a lower stopper 7, a spiral cable 8 is housed in the fixed pillar 1 in a contracted state. When moving the liftable deck 3 upward, the spiral cable 8 extends upward along a guide rod 9 to follow a movement of the liftable deck 3. When supporting the liftable deck 3 by an upper deck 6, the spiral cable 8 is put in a state of extending to its maximum. Thus, since the spiral cable 8 always runs along the guide rod 9 fixed at an interval even in any state, an interval is mutually kept. |
