PROBLEM TO BE SOLVED: To make it possible to lower towed objects without relying upon a motor by making a ratchet mechanism a release state and switching to an electromagnetic clutch intermittent mode in which engaging and disengaging of the electromagnetic clutch are repeated.SOLUTION: The electromagnetic clutch 84 making a drum and a motor part 81 a fastening state or an opening state is arranged between the drum and the motor part 81, the ratchet mechanism regulating the rotation of the drum in a dispensing direction while allowing the rotational of the drum in a pulling in direction in a lock state and allowing the rotation of the drum in the pulling in direction and the dispensing direction in a release state is arranged in the drum, and a forcible free mode switching section 52 switching to "a forcible free mode" in which engaging and disengaging of the electromagnetic clutch 84 are repeated while controlling the ratchet mechanism in the release state along with the input of a mode switching signal MS from an operation panel 60 is arranged in a controller 50. Accordingly, the engaging and disengaging of the electromagnetic clutch 84 are repeated and the drum can intermittently rotate in a dispensing direction.COPYRIGHT: (C)2013,JPO&INPIT【課題】ラチェット機構をリリース状態としかつ電磁クラッチの断続を繰り返す電磁クラッチ断続モードに切り替え、モータに依らず被牽引物を降ろせるようにする。【解決手段】ドラムとモータ部81との間に、ドラムおよびモータ部81を締結状態または開放状態とする電磁クラッチ84を設け、ドラムに、ロック状態でドラムの引き込み方向への回転を許容しつつ送り出し方向への回転を規制し、リリース状態でドラムの引き込み方向および送り出し方向への回転を許容するラチェット機構を設け、コントローラ50に、操作パネル60からのモード切替信号MSの入力に伴い、ラチェット機構をリリース状態に制御しつつ電磁クラッチ84の断続を繰り返す「強制フリーモード」に切り替える強制フリーモード切替部52を設けた。よって、電磁クラッチ84の断続が繰り返され、ドラムが送り出し方向に断続的に回転可能となる。【選択図】図8
