A spring loaded tensioning device for tensioning a flexible blind control element loop to be secured in position on a building, and having a housing shell; a hinged door on the housing shell operable between an open position for insertion of the control element and a closed position, a moveable lock in the housing shell, moveable between a locking position in which it clamps onto the element, and a released position in which the lock is free of the control element; and, a spring urging the lock to clamp onto the control element.

A spring loaded tensioning device for tensioning a flexible blind control element loop to be secured in position on a building , and having a housing shell; a hinged door on the housing shell operable between an open position for insertion of the control element and a closed position, a moveable lock in the housing shell, moveable between a locking position in which it clamps onto the element, and a released position in which the lock is free of the control element; and, a spring urging the lock to clamp onto the control element.

A window curtain control device includes a top box having a room therein, and a fixed part and a scrolling member are respectively positioned on two ends of the room. A curtain is connected to the top box, and a bottom rail is connected to the lower end of the curtain. A movable part is movably located between the fixed part and the scrolling member. A tension rope has one end fixed to the fixed part, and the other end of the tension rope wraps around the fixed part and the movable part. A driving rope has one end fixed to the movable part and the other end of the driving rope includes an operation portion which extends through the top box. The curtain is moved by operating the operation portion.

A window curtain control device includes a top box having a room therein, and a fixed part and a scrolling member are respectively positioned on two ends of the room. A curtain is connected to the top box, and a bottom rail is connected to the lower end of the curtain. A movable part is movably located between the fixed part and the scrolling member. A tension rope has one end fixed to the fixed part, and the other end of the tension rope wraps around the fixed part and the movable part. A driving rope has one end fixed to the movable part and the other end of the driving rope includes an operation portion which extends through the top box. The curtain is moved by operating the operation portion.

A tensioning device comprising a guide adapted to receive thereabout one end of a looped operating element (LOE), a retainer configured to prevent said one end from traveling about the guide, the guide and retainer being configured to move relative one another between first and second positions; a biasing element for biasing the guide towards the retainer to tension the LOE. In the first position, the LOE has no tension and the guide is extended to trap said one end between the guide and the retainer to prevent travel of the LOE about the guide. In the second position, the LOE is tensioned with the guide being retracted from the retainer, and a locking device for locking the guide in the first position when the LOE has no tension such that the guide cannot be retracted away from the retainer to allow operation of the operating element.

A tensioning device comprising a guide adapted to receive thereabout one end of a looped operating element (LOE), a retainer configured to prevent said one end from traveling about the guide, the guide and retainer being configured to move relative one another between first and second positions; a biasing element for biasing the guide towards the retainer to tension the LOE. In the first position, the LOE has no tension and the guide is extended to trap said one end between the guide and the retainer to prevent travel of the LOE about the guide. In the second position, the LOE is tensioned with the guide being retracted from the retainer, and a locking device for locking the guide in the first position when the LOE has no tension such that the guide cannot be retracted away from the retainer to allow operation of the operating element.