Beaded-chain control device for window blinds

Abstract

A beaded-chain control device for window blinds comprises a positioning seat with an assembling cavity defining one side therein for the accommodation of a cord-winding unit equipped with a two-way rotary cylinder thereon wherein the two-way rotary cylinder is driven by a beaded-chain to rotate in clockwise or counterclockwise direction thereby, and the assembling cavity thereof has a passage cut at both lateral sides thereon respectively. The cord-winding unit also has a smaller-diameter winding-shaft protruding at the other end of the two-way rotary cylinder to precisely align with the passages thereof so that an actuating cord can pass through the passage to attach onto the winding-shaft and synchronically actuate each pull cord linked thereto to collect or expand a blind body thereby, permitting smoother operation and reducing the assembly parts to cut the cost of production and achieve economical efficiency thereby.

1 . A beaded-chain control device for window blinds, comprising a positioning seat with an assembling cavity defining the interior of one side for the accommodation of a cord-winding unit equipped with a two-way rotary cylinder thereon wherein the two-way rotary cylinder is driven by a beaded-chain to rotate in clockwise or counterclockwise direction thereby; the present invention being characterized by that, 
 the assembling cavity of the positioning seat having a passage cut at both lateral sides thereon respectively, and the cord-winding unit having a smaller-diameter winding-shaft protruding at the other end of the two-way rotary cylinder to precisely align with the passages thereof so that an actuating cord can be guided through the passages to attach onto the winding-shaft and synchronically actuated to coil up or release according to the revolving direction of the winding-shaft thereby.    
     
     
         2 . The beaded-chain control device for window blinds as claimed in  claim 1  wherein the actuating cord can have more than two pull cords synchronically attached thereto at one end thereof.  
     
     
         3 . The beaded-chain control device for window blinds as claimed in  claim 1  wherein both sides of the winding-shaft are defined by a set of stop rings that, each shaped larger than the outer diameter of the two-way rotary cylinder, are precisely situated at both sides of the passages thereof.  
     
     
         4 . The beaded-chain control device for window blinds as claimed in  claim 3  wherein the winding-shaft has a pivoting axle extending outwards from the stop ring situated at the outer side thereof.  
     
     
         5 . The beaded-chain control device for window blinds as claimed in  claim 1  wherein the passage of the positioning seat can be made in a rectangular-shaped configuration.