Cordless window blind structure

Abstract

A cordless window blind structure comprises a head rail having an accommodating channel into which a cord-winding control device with an operational cord attached thereto and a fixed seat are mounted at both end sides with a movable seat situated there-between. The operational cord is also fixed to one side of the movable seat. Multiple lift cords mounted to the corresponding positions of a blind body and a bottom rail are guided into the accommodating channel and divided to extend from either the upper or lower side of a guiding post of the fixed and movable seats respectively and wind onto multiple guiding elements, permitting the operational cord to link in movement to the lift cords wound onto the movable and fixed seats. Therefore, the bottom rail is simply pushed or pulled by hands to easily and accurately adjust the blind body into a desirable collected or expanded position thereby.

1 . A cordless window blind structure, comprising a head rail with an accommodating channel defining thereon wherein the bottom surface of the accommodating channel has multiple cord passages disposed thereon and both end sides thereof are respectively secured a cord-winding control device and a fixed seat; besides, a movable seat is mounted to situate between the cord-winding control device and the fixed seat and allowed to freely slide in the accommodating channel thereof; a blind body is attached to the underside of the head rail at one end edge and fixed to a bottom rail at the other end edge thereof; multiple lift cords are mounted to the corresponding positions of the blind body and the bottom rail, and are respectively guided to pass through the cord passages of the head rail; the fixed seat and the movable seat are respectively equipped with multiple guiding elements and a transverse-extending guiding post so that the lift cords can be separately divided to extend from either the upper or lower side of both guiding posts to wind onto the guiding elements of both fixed and movable seats thereof in a sequence, efficiently achieving separating and guiding purposes and preventing the lift cords from entangling with each other; in addition, an operational cord is attached to the cord-winding control device at one end and fixed to one side of the movable seat at the other end thereof so that the operational cord can be correspondingly linked in movement to the lift cords wound onto the movable seat and the fixed seat thereon; therefore, the bottom rail is simply pushed or pulled by hands to loosen or tighten the lift cords wound on the movable seat, and actuate the movement of the operational cord therewith to form a state of counterbalance there-between, permitting a user to easily and smoothly adjust the blind body into a desirable collected or expanded position thereby. 
     
     
         2 . The cordless window blind structure as claimed in  claim 1  wherein the cord-winding control device is composed of a base, a top sheet, and a rotary seat that, mounted between the base and the top sheet, has an operational cord attached and wound thereto; the bottom surface of the rotary seat has a smaller-diameter rotating shaft protruding thereon, and both sides of the rotating shaft have a torsion spring mounted thereto respectively so that, depending on the actuation of the operational cord and the spinning direction of the rotary seat, the torsion springs are allowed to wind or counter-wind along the rotating shaft and elastically locate in place thereby. 
     
     
         3 . The cordless window blind structure as claimed in  claim 2  wherein the top sheet of the cord-winding control device is integrally coiled downwards at one side to form a pair of pivoting holes thereon for a sliding post to extend there-through and locate in place thereby. 
     
     
         4 . The cordless window blind structure as claimed in  claim 1  wherein the fixed seat and the movable seat are respectively equipped with a set of bottom and upper plates to form a winding groove there-between for the mounting of the guiding elements thereon; both bottom plates of the fixed and movable seats have a pair of symmetrically-arranged supports disposed at the corresponding sides thereon respectively, and each support has a flexible clip recess defining thereon so as to hold the transverse-extending guiding post firmly in place thereby. 
     
     
         5 . The cordless window blind structure as claimed in  claim 1  wherein the number of the guiding elements of the fixed and the movable seats can be determined by the length of the lift cords and set into two or more than two thereof. 
     
     
         6 . The cordless window blind structure as claimed in  claim 4  wherein the winding groove of the fixed seat has a guide rod and a positioning rod with a recess cut thereon disposed at one lateral side thereon, to which the lift cords are synchronically guided to run and wind thereon with the ends tied up to form a fixed end thereby. 
     
     
         7 . The cordless window blind structure as claimed in  claim 4  wherein the winding groove of the movable seat has a fixed rod extending at one side thereon for the attachment of the operational cord thereto. 
     
     
         8 . The cordless window blind structure as claimed in  claim 4  wherein the bottom plate of the movable seat also includes supporting legs extending downwards at the underside thereon. 
     
     
         9 . The cordless window blind structure as claimed in  claim 1  wherein the movable seat and the head rail are respectively equipped with multiple pulleys each defined by a grooved path, and a set of guide tracks each defined by a positioning recess, permitting the pulleys of the movable seat to slide along the guide tracks of the head rail in operation.