| 摘要 |
An over turn protective apparatus of a blind is provided to prevent cloth from being tangled by preventing over turn and idle rotation and to set the ascent and descent range of the blind. An over turn protective apparatus of a blind comprises a shaft(41), a cover unit(43), a drive unit(42), and an anti-reverse rotation unit(44). On the inner circumference of a drive unit, a screw thread corresponding to the screw thread of the shaft is formed. On the outer circumference of the drive unit, a joint combined with a drum is formed. At one end of the drive unit, a first stopper(42a) corresponding to the protrusion(41a) of the cover unit' is formed. The drive unit operates when the drum(10) is rotated. The protrusion of the cover unit regulates the drive unit in the forward rotation of the drive unit. The protrusion of the anti-reverse rotation regulates the drive unit in the reverse rotation of the drive unit. The anti-reverse rotation unit is connected to the shaft. |
