Abstract: An elasticity changeable structure of a curtain reeling device contains: a main tension wheel, a first drive wheel, an auxiliary tension wheel, and a second drive wheel. The main tension wheel includes a spiral spring rolled on the main tension spring and abutting against the auxiliary tension wheel, and an operation rope are rolled on the first and second drive wheels respectively. The spiral spring includes an elasticity section having a fixed part made in a common curvature, a buffer part made in an increased curvature, a first resisting part made in a decreased curvature, a second resisting part made in a lowest curvature, and a fixing part formed on a distal end of the second resisting part. An elasticity of the second resisting part is more than the first resisting part, and an elasticity of the first resisting part is more than the buffer part.

Abstract: 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.

Abstract: 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.

Abstract: A cord winding structure for cordless blind is assembled in a cordless blind. A cord winder includes an upper case and a lower case which are respectively arranged a plurality of columns and posts and combined with each other by bolts. At least one winding wheel for winding a bearing rope, a driving wheel, and a driven wheel arranged corresponding to the driving wheel are assembled to the columns. The driving wheel, the driven wheel, and the winding wheel are respectively formed a gear-like driving portion. The gear-like driving portions of the wheels are engaged with one another. The driving wheel has a gradient coil spring which has different curvatures to result in a front end with weaker elasticity and a rear end with stronger elasticity. The front end of the gradient coil spring is winded on the driven wheel to make the cordless blind correctly be operated.

Abstract: A window blind assembly is disclosed and comprises a blind set, a light modulation device, a pull cord take-up device, and a coil spring control device. The blind set includes a bottom rail, a stopper, leaves, a blind ladder, pull cords, and a headrail. The light modulation device includes a wheel set, a wheel, a cover, an iron bar, a block, and a stick. The pull cord take-up device includes two mounts, a wrapping reel, and iron cores. The coil spring control device includes a bottom plate, a driving gear, a spring shaft, a coil spring, an upper gear cap, an upper cap, and a driven gear. The angle adjustment of the leaves of the blind set is realized by rotating the wrapping reel. When the bottom rail is pulled downwardly, the pull cords are driving the wrapping reel to rotate. The pull cord arranged on the coil spring control device is pulled out and wrapped around the wrapping reel.

Abstract: A locking device for window blind between two panes of glass is disclosed. The window blind is arranged between tow panes of glass through the attraction of the inside magnet and the outside magnet to transmit power to control the operation of the window blind. The locking device may achieve the effects of controlling smoothly and stopping firmly. The locking device may comprise a control shaft and a track. The control shaft includes a locking body, a switch, a hook, a spring, a bearing, and a magnet. The control shaft may be connected with the track through a hook position. The window blind is controlled by attraction of the inside magnet and the outside magnet to achieve the effects of control of raising and lowering the window blind between two panes of glass and light modulation. The locking device is controlled the engagement and disengagement between the hook and the track by the switch to ensure the window blind stopping at any position and without sliding down.

Abstract: A sealed magnetic-controlled window blind between two panes of glass is disclosed. Raising or lowering the window blind which is sealed between two panes of glass is performed by the magnetic attraction between the between the raising outside control set and the raising inside control set (the magnets may be used). In addition, the operation of raising or lowering the window blind may be smooth due to the arrangement of the pulleys (or bearing) which are arranged on the raising inside control set and the outside control set.