Blind body collecting-expanding control device for window blinds

Abstract

A blind body collecting-expanding control device for window blinds comprises a head rail, a bottom rail, a cord-winding control device, a transmission assembly, and a blind body wherein the head rail has an accommodating channel defining one end thereon to receive the cord-winding control device therein. The cord-winding control device links in movement to the transmission assembly composed of support seats, a winding shaft, lift cords, an operational cord, and a sliding element so that the blind body can be easily actuated thereby to collect upwards or expand downwards in operation. Via the aforementioned structure, the pushing or pulling force exerted by hands reciprocally interacts with the cord-winding control device so that a user can freely adjust the blind body into a desirable position, achieving the best adjustment effect as well as easy and speedy assembly thereof.

1 . A blind body collecting-expanding control device for window blinds, comprising a cord-winding control device and a transmission assembly that are respectively received into an accommodating channel of a head rail wherein the transmission assembly is equipped with multiple lift cords reciprocally working with an operational cord so that the lift cords and the operational cord can be actuated to recoil or release via the transmission assembly and the constant torques generated by the cord-winding control device thereof; besides, the lift cords are led through the blind body to fixedly attach to a bottom rail; therefore, the blind body is correspondingly linked in movement to the cord-winding control device and the transmission assembly, and synchronically actuated by the lift cords either recoiled or released to collect upwards or expand downwards accordingly in operation.  
   
   
       2 . The blind body collecting-expanding control device for window blinds as claimed in  claim 1  wherein the cord-winding control device is equipped with a set of upper and lower housings, a rotary seat, and torsion springs.  
   
   
       3 . The blind body collecting-expanding control device for window blinds as claimed in  claim 2  wherein the lower housing is identically shaped like the upper housing, and set in reverse directions therewith; besides, the upper and lower are respectively provided with male/female reciprocal conjoining sections and symmetrical portions to be closed up and joined to each other.  
   
   
       4 . The blind body collecting-expanding control device for window blinds as claimed in  claim 2  wherein the upper and lower housings are respectively equipped with a set of stop seats symmetrically extending at both lateral side edges thereon wherein one stop seat has an insert hook extending at the top surface thereon, and the other stop seat has a recess indented at the outer wall corresponding to the position of the insert hook thereof; the two stop seats surround an annular groove with a central shaft, and a set of positioning arcuate grooves therein wherein positioning rods are symmetrically disposed protruding at the four corners along the outer circumferential edge of the annular groove thereon.  
   
   
       5 . The blind body collecting-expanding control device for window blinds as claimed in  claim 2  wherein the rotary seat has a cylindrical actuation body extending at one side, and the cylindrical actuation body is equipped with a counter-winding surface with a set of indented fixing holes defining thereon; a coiling surface equipped with a roller seat is disposed extending at the other side of the rotary seat wherein a stop portion with a central opening extending in the middle is attached to one side of the coiling surface, and an abutment face is formed at the conjoining section of the counter-winding surface and the coiling surface thereof, permitting the counter-winding surface to precisely mount to the central shaft and the abutment face to accurately locate in place astride onto the positioning rods thereon.  
   
   
       6 . The blind body collecting-expanding control device for window blinds as claimed in  claim 5  wherein the actuation body thereof is shaped in a cylindrical configuration.  
   
   
       7 . The blind body collecting-expanding control device for window blinds as claimed in  claim 1  wherein the transmission assembly is composed of support seats, a winding shaft, lift cords, an operational cord, and a sliding element.  
   
   
       8 . The blind body collecting-expanding control device for window blinds as claimed in  claim 7  wherein the support seats are respectively equipped with a guide passage disposed at one side for the extension of the winding shaft there-through.  
   
   
       9 . The blind body collecting-expanding control device for window blinds as claimed in  claim 1  wherein the lift cords and the operational cord can be made of strap bodies.  
   
   
       10 . The blind body collecting-expanding control device for window blinds as claimed in  claim 1  wherein the lift cords and the operational cord can also be made of cable ropes.  
   
   
       11 . The blind body collecting-expanding control device for window blinds as claimed in  claim 2  wherein the torsion springs of the cord-winding control device can be flexibly set into one or more than one, depending on the size of the blind body.