| 摘要 |
A running gear is guided by a carrying rope and movable along the same. A crane housing is connected to said running gear. A pullback rope is secured to the crane housing and operable to pull said crane housing along said carrying rope. A lifting rope pulley formed with a peripheral groove is mounted on a shaft which is mounted in said crane housing. A lifting rope trained around said lifting rope pulley in said groove is adapted to be paid out from said lifting rope pulley by a rotation of the latter in a predetermined sense. A storage drum is mounted on said shaft and non-rotatably connected to said lifting rope pulley. A payout rope is wound on said storage drum and operable to be unwound from said storage drum so as to rotate the same in said predetermined sense. At least one pressure roller is associated with said lifting rope in said groove. Pressure-applying means are provided for forcing said pressure roller against said lifting rope in said groove. Drive means are provided for positively driving said pressure roller at a peripheral velocity which is equal to the peripheral velocity of said lifting rope in said groove as said payout rope is unwound from said storage drum.
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