Single pull-cord controller of roman shade

• US 9,341,020 B1
• Filed: 03/24/2015
• Issued: 05/17/2016
• Est. Priority Date: 03/24/2015
• Status: Active Grant

• Current Assignee: Uni-Soleil Ent. Co., Ltd.
• Original Assignee: Uni-Soleil Ent. Co., Ltd.
• Inventors: Kao, Yu-Ting
• Primary Examiner(s): PUROL, DAVID M
• Application Number:
  US14/666,504
• Time in Patent Office: 420 Days
• Field of Search: 160/84.01, 160/84.04, 160/84.05, 160/170, 160/171
• US Class Current: 1/1
• CPC Class Codes: E06B 2009/2622 Gathered vertically; Roman, Austrian or festoon blinds
• CPC Class Codes: E06B 9/262 with flexibly-interconnected horizontal or vertical strips; Concertina blinds , i.e. upwardly folding flexible screens

Abstract

A single pull-cord controller of roman shade comprises: a main control unit, a winding member, a first shaft member, a second shaft member, an inner bushing, an outer bushing, and a coupling unit. By the single pull-cord controller of the present invention, the up-down operation of the roman shade can be controlled by the pulling or releasing of a single pull-cord, and the pull-cord after manipulation can be wound within the controller by the recovery of the clock spring. Therefore, dangerous state of strangulation by wrapping around children'"'"'s neck can be effectively avoided to achieve the object of safety precaution.

Claims

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.

2. The single pull-cord controller of roman shade as claimed in claim 1, wherein the first end of the first shaft member has a slit groove for inserting an inner end of the clock spring therein, while the chamber of the winding member is provided with a fixing tab on an inner wall thereof for fixing an outer end of the clock spring.