ROLL BLIND HAVING SAFETY CORD

摘要

A roll blind with a single safety cord is provided in which an ascending cord and a descending cord configured to ascend and descend a blind sheet are integrated in a single safety cord. When it needs to descend a blind sheet, the single safety cord is pulled forward, and the clutches are disengaged, so the blind sheet can be fast descended. When it needs to ascend the blind sheet, the single safety cord is repeatedly pulled right downward, the blind sheet can be easily ascended. Once the single safety cord is pulled downward, it can be automatically returned to its original position based on an origin position ascending and returning function, so a user can easily ascend the blind sheet. The single safety cord is made shorter and is positioned higher where a kid's hand does not reach, so it is possible to prevent a kid or a weak person from choking or stumbling over and falling down.

主权项

1. A roll blind with a single safety cord for a roll blind device which is made to wind a blind sheet on a winding rod and store the wound blind sheet or when in use to unwind it from the winding rod, comprising:
a winding part by which as a driving connector connected to one side of the winding rod rotates in one direction, the blind sheet wound on the winding rod ascends, and as the driving connector and the winding rod rotate in the other direction, the blind sheet descends; an ascending operation part including:
a movable clutch which slide-engages in an axial direction at an inner side of the driving connector; anda rotation clutch which is rotatable at an inner side of the driving connector, wherein in the movable clutch and the rotation clutch, the opposite clutches are engaged or disengaged as the movable clutch moves left or right, and in a state that the rotation clutch and the movable clutch are engaged, the blind sheet can ascend by pulling right downward a single safety cord of the cord pulley connected to the rotation clutch; and a descending operation part by which the blind sheet can descend in such a way to rotate the movable clutch and to disengage from the rotatable clutch by pulling forward the single safety cord and rotating a descending adjusting lever with the aid of an engaging member, wherein the descending adjusting lever is disposed at one side of the movable clutch, and a lower end of the descending adjusting lever forms the engaging member at a forward side of the single safety cord.