| 摘要 |
A damper spring having a torsion coil spring-like shape is placed on outer peripheries of bosses respectively formed on a rope reel and a cam. The ends of the damper spring are engaged with the rope reel and the cam, respectively, so that the rope reel and the cam are rotatingly coupled with each other. A wire member constituting the damper spring is formed so as to have a section shape in which at least one side is linearly formed, and the damper spring is formed by winding the wire member into a coil-like shape so that the linear portion of the wire member is placed on an inner peripheral side, thereby enabling the inner side face of the damper spring to be tightly wound in a wide area around outer peripheral faces of the bosses.
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