Control assembly for folding/unfolding and adjusting an inclination angle of slats of a universal venetian blind

摘要

A control assembly includes a control box mounted to a rail on a top of a Venetian blind. A longitudinal shaft is mounted in a box body of the control box and is rotatable along a longitudinal axis. An actuation string is wound around a friction wheel on the longitudinal shaft and can be operated to adjust an inclination angle of slats of the Venetian blind. A transverse shaft is mounted in the box body and extends perpendicularly to the longitudinal shaft. A direction-changing gear unit is mounted between the longitudinal shaft and the transverse shaft. The transverse shaft includes two string winding grooves each having increasing depths from two sides thereof towards a center thereof. The box body includes a bottom having a central string hole between two side string holes. The central string hole is divided by a transverse support and a longitudinal support.

主权项

1. A control assembly for folding/unfolding slats of a universal Venetian blind and for adjusting an inclination angle of the slats of the universal Venetian blind, with the control assembly comprising:
a control box adapted to be mounted to a rail on a top of a Venetian blind including a plurality of slats, with the control box including a box body and a cover mounted to the box body, and with the box body including a bottom having two side string holes spaced from each other; a longitudinal shaft mounted in the box body, with the longitudinal shaft rotatable along a longitudinal axis, with a friction wheel mounted to an end of the longitudinal shaft, with an actuation string adapted to be wound around the friction wheel, and with the actuation string operable to adjust an inclination angle of the plurality of slats of the Venetian blind; and a transverse shaft mounted in the box body and extending perpendicularly to the longitudinal shaft, with a direction-changing gear unit mounted between the longitudinal shaft and the transverse shaft, with the transverse shaft including a first string winding groove and a second string winding groove respectively adjacent to two ends of the transverse shaft, with the first string winding groove having increasing depths from two sides of the first string winding groove towards a center of the first string winding groove, and with the second string winding groove having increasing depths from two sides of the second winding groove towards a center of the second string winding groove, with the bottom of the box body further including a central string hole between the two side string holes, with the box body further including a transverse support extending in a transverse direction perpendicular to the longitudinal axis and a longitudinal support extending along an axis parallel to and spaced from the longitudinal axis, with the central string hole divided by the transverse support and the longitudinal support into a first section and a second section, with the first section and the second section being distant to the first and second string winding grooves, with the first section and the first string winding groove located on a side of the longitudinal axis, and with the second section and the second string winding groove located on another side of the longitudinal axis, wherein if a pull string is used with the control assembly, the pull string extends from the second section to the first string winding groove or extends from the first section to the second string winding groove, wherein a first imaginary line passes through a connection between the transverse support and the longitudinal support in the first section and a lowest point in the second string winding groove, a second imaginary line passes through the lowest point in the second string winding groove and extends parallel to the longitudinal axis, and an angle between the first and second imaginary lines is larger than zero, and wherein a third imaginary line passes through a connection between the transverse support and the longitudinal support in the second section and a lowest point in the first string winding section, a fourth imaginary line passes through the lowest point in the first string winding groove and extends parallel to the longitudinal axis, and an angle between the third and fourth imaginary lines is larger than zero.