| 摘要 |
When a take-up pulley 102 is rotated forward by driving a motor 84 forwardly, a holding plate 106 pushes a stopper 112 into forward rotation. When a wire 110 is thereby pulled and being wound around the take-up pulley 102, a control pipe 34 and ultimately an inner pipe 28 is received in an outer pipe 16. When the inner pipe 28 is received in the outer pipe 26 and the inner pipe 28 is held by a lock plate 54, the motor 84 is driven reverse to rotate the holding plate 106 reversely, together with the take-up pulley 102, to space away from the stopper 112. In this state, until the stopper 112 comes into contact with the holding plate 106, the wire 110 can move toward its one end and ultimately the inner pipe 28 and the control pipe 34 can move upward.
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