| 摘要 |
A safety lift of PDB equipment is provided to prevent a fall by connecting safety rings with a safety rope with slightly elevating the casing to allow the elevator to follow the casing by a height of the casing during the stop of the casing. A reel(2) having a crush unit is installed in a cage. The cage is lifted and lowered by the operation of the reel and the casing by connecting one end of a rope(4) wound on the reel to an upper portion of the casing. A safety ring suspended on the cage and the safety ring suspended on a leather are connected by a safety rope(5). A fall is prevented by connecting the safety rings with the safety rope.
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