BALANCED FOLDING/UNFOLDING DEVICE FOR A SHADE UNIT OF A WINDOW SHADE WITHOUT A PULL CORD

摘要

A balanced folding/unfolding device includes a top housing having a first string hole and a second string hole. A reverse winding portion and forward winding portion are mounted in the top housing. A vortex spring unit is mounted in the top housing and includes a first spring mechanism directly or indirectly connected to a first end of a first driving string and a first end of a second driving string. The first driving string and the second driving string extend in the same function. A second end of the first driving string extends around the forward winding portion and then passes downwards through the first cord hole for connection with a shade unit of a window shade without a pull cord. A second end of the second driving string extends around the reverse winding portion and then passes downwards through the second cord hole for connection with the shade unit.

主权项

1. A balanced folding/unfolding device for a shade unit of a window shade without a pull cord, comprising:
a top housing including a first string hole and a second string hole; a reverse winding portion mounted in the top housing; a forward winding portion mounted in the top housing; a vortex spring unit mounted in the top housing, with the vortex spring unit including a first spring mechanism directly or indirectly connected to a first end of a first driving string and a first end of a second driving string, with the first driving string and the second driving string extending in a same function, with a second end of the first driving string extending around the forward winding portion and then passing downwards through the first cord hole for connection with a shade unit of a window shade without a pull cord, with a second end of the second driving string extending around the reverse winding portion and then passing downwards through the second cord hole for connection with the shade unit.