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.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a cordless window blind structure, comprising 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 ends with a movable seat situated there-between wherein the operational cord is correspondingly linked in movement to lifts cords so that a bottom rail is simply pushed or pulled by hands to loosen or tighten the lift cords wound on the movable seat and synchronically actuate the operational cord therewith, facilitating easier and simpler adjustment of a blind body into a desirable collected or expanded position.[0002]Conventional window blinds usually have pull cords mounted to suspend at one side of a blind body and retained in position by a pulley assembly to collect or expand the blind body thereby. In operation, the pull cords are drawn by force of hands to adjust the position of the blind body. Due to the ...

AI Technical Summary

Benefits of technology

[0003]It is, therefore, the primary purpose of the present invention to provide a cordless window blind structure wherein an operational cord attached to a cord-winding control device is correspondingly linked in movement to lift cords wound onto a movable seat and a fixed seat so that a bottom rail is simply pushed or pulled by hands to freely adjust the height of a blind body in an easy manner without the hands abraded by the conventional pull cords, achieving the best state of application thereby.

[0004]It is, therefore, the second purpose of the present invention to provide a cordless window blind structure wherein the cord-winding control device is equipped with torsion springs whose elasticity permit the operational cord to precisely recoil and locate in place according to the pushing / pulling force applied by the hands onto the bottom rail and the lift cords, avoiding the inconvenience of re-adjustment found in the conventional pull cords above to achieve more accurate and easier operation as well as assembly thereby.

[0005]It is, therefore, the third purpose of the present invention to provide a cordless window blind structure wherein the movable seat and the fixed seat are respectively equipped with a winding groove for multiple guiding elements and a transverse-extending guiding post to mount thereon so that the lift cords can be separately divided to extend from either the upper or the lower side of the guiding posts and wind onto the guiding elements thereon respectively, achieving the purposes of separating and guiding each lift cord without them entangling with each other so that the blind body can be smoothly expanded and collected in operation thereby.

Problems solved by technology

Due to the small frictional surface thereof, the pull cords tend to rub against the hands or even abrade the hands directly contacting with them in an uncomfortable way if the pull cords are drawn to slide too fast.

Thus, great efforts must be spent to draw the pull cords in operation, and the pull cords can easily get stuck in the pulley assembly, resulting in an awkward operation and becoming unsuitable for users of younger ages.

Besides, in case of an excessive down-pulling force exerted onto the pull cords or a sudden release of the pull cords at great speed, the blind body cannot be accurately positioned in a desirable position and the adjustment process must be repeated over again, which is quite inconvenient in operation.

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