Patent ID: 9341020
Filing Date: 2016-05-17
CPC Classification: E06B

Claim Text:
1. A single pull-cord controller of roman shade, mainly comprises: a main control unit, with an outer sleeve fitted over its outside, has a first housing cavity and a second housing cavity with a central aperture provided at the end face; an open end of the first housing cavity is provided with an external cover which has a stationary shaft holding depression provided at its center so that the external cover can close the first housing cavity; a cord hole is further provided within the first housing cavity; a winding member located correspondingly within the first housing cavity of the main control unit; the winding member has a chamber and a winding passage, a bore is provided at the center of the chamber for the passing-through of the winding member; the winding passage is provided outside the winding member so as to wind up a pull-cord, and the pull-cord pierces out through the cord hole; at least one protruding block is further provided on a wall surface of the winding member corresponding to the bore; a first shaft member correspondingly provided in the bore of the winding member; a clock spring is inserted on a first end of the first shaft member and is located in the chamber of the winding member; the first end of the first shaft member is inserted in the stationary shaft holding depression; a second shaft member, positioned in the second housing cavity of the main control unit, which has a first step segment and a second step segment, the inner diameter of the first step segment is fitted with the second end of the first shaft member; then, a first torsion spring member and a second torsion spring member are respectively fitted over the first step segment and the second step segment; an inner bushing, enclosing over the first torsion spring member and fitted over the first step segment of the second shaft member; projections are provided on the outer periphery of the inner bushing; an outer bushing, correspondingly fitted over the second step segment of the second shaft member; a blocking edge is provided within the inner diameter thereof, so as to correspondingly press against the second torsion spring member; the outer bushing has aisle paths provided correspondingly to the protruding blocks and the aisle paths are in moving contact with the protruding blocks; each of the aisle paths has a straight segment and a slant segment, and an arc protruding section is interposed between two aisle paths; each of the arc protruding sections is formed with a projecting teeth adjacent to the slant segment and extending in radial direction; the other end of the outer bushing opposite to the aisle paths is provided with tooth portions; a coupling unit having tooth blocks corresponding to and detachably meshing with the tooth portions on the outer bushing; the coupling unit is located within the second housing cavity of the main control unit, and a shaft tube at one end of the coupling unit penetrates through the central aperture of the main control unit so as to connect with a mandrel rod of the window curtain.