公开(公告)号：US20180291679A1

公开(公告)日：2018-10-11

申请号：US15977864

申请日：2018-05-11

申请人： Song-Li ZHENG

发明人： Song-Li ZHENG

IPC分类号： E06B9/322 ,  E06B9/323

摘要： A window blind system including a headrail, a bottomrail, a covering material disposed between the headrail and the bottomrail, and a control device is provided. The control device controls collection and expansion of the covering material effectively. The control device comprises a case having a first shaft and a second shaft, a coil spring, a first wheel configured with a fixing hole, a second wheel engaged with the first wheel, a torsion spring configured with a fixing end. The torsion spring is sleeved around the first shaft. The first wheel and the second wheel are pivoted in the first shaft and the second shaft. The torsion spring is disposed between the first shaft and the first wheel. The fixing end of the torsion spring is fixed in the fixing hole of the first wheel. The coil spring is winded between the first wheel and the second wheel.

公开(公告)号：US20180291678A1

公开(公告)日：2018-10-11

申请号：US15482833

申请日：2017-04-10

申请人： SONG-LI ZHENG

发明人： SONG-LI ZHENG

IPC分类号： E06B9/322 ,  E06B9/307

摘要： A control device comprises an upper fixing plate, a lower fixing plate, a coil spring, and a first gear and a second gear which are arranged between the upper and lower fixing plates. The first and second gears are engaged with each other. Each of the first and second gears has a coil spring fixing portion and a coil fixing portion arranged thereon. When the window blind is pulled up, one end of the coil spring is connected with the coil spring fixing portion of the first gear and the other end of the coil spring is winded around the coil spring fixing portion of the second gear. The gear structure may simplify the structure of the control device. The structure and the driving relation are easier and hard to malfunction and further to reduce the occupied space for being suitable for the window blinds with specific sizes.