Patent Publication Number: US-2013240157-A1

Title: Electric window blinds

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a window blind, and more particularly, to an electric window blind wherein the angles of the slats are adjusted by an electric adjustment device. 
     2. Description of Related Art 
     Windows provide ventilation to bring fresh air into the room and light is also introduced into the room to have better illumination. However, windows also make the activities in the room be visible from outside so that window blinds are used to close the windows when needed. The conventional window blinds such as shutters, roller blinds and roman shades, all of which are designed to set an adjustable barrier between the interior and the exterior of the room and the users can operate the window blinds to be partially or completely opened or closed. 
     For the windows with slats, the slats are connected by ropes which are connected with a control device located in the head box and the uses can operate the rope to lift the slats upward or downward. The slats can also be controlled to be pivoted and set at different angular positions by a control bar to introduce light into the room or to shut the window blind off. 
     The pivotal movements of the slats of the window blinds are operated by pull the rope or rotate a control bar and this means that the users have to approach the window to access the rope and the control bar. This may not be convenient for some users. 
     The present invention intends to provide an electric window blind and the slats are pivoted by the electric motor to be effectively operated. 
     SUMMARY OF THE INVENTION 
     The present invention relates to an electric window blind and comprises a window frame and multiple slats which are located between two side rails of the window frame. Each of the slats has two end faces and each end face has a mediate portion and two end portions. The medial portion of each of two end faces of each of the slats is pivotably connected to the window frame. An adjustment device has a power unit which has an output end and an arm with an elongate slot is connected to the output end. A link is fixed to the plates and has a protrusion which is movably engaged with the elongate slot. One of the two end portions of each slat is pivotably connected to the plate. By activating the power unit, the slats are pivoted to adjust the angular positions of the slats. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view to show the window blind of the present invention; 
         FIG. 2  is another perspective view to show the window blind of the present invention; 
         FIG. 3  shows that the slats are pivoted by the operation of the adjustment device, and 
         FIG. 4  shows that the slats are pivoted to another angular position by the operation of the adjustment device. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 and 2 , the window blind  1  of the present invention comprises a window frame  11  and multiple slats  12  are located between two side rails of the window frame  11 . Each of the slats  12  has two end faces and each end face has a mediate portion and two end portions. The medial portion of each of two end faces of each of the slats  12  is pivotably connected to the window frame  11 . 
     An adjustment device  2  is fixed to the window frame  11  and has a power unit  21  which has an output end, wherein the power unit  21  comprises a motor  211  and a gear reduction unit  212  connected to the motor  211  or a direct current motor. An arm  22  is connected to the output end and has an elongate slot  221 . A link  23  is fixed to a plate  24  and has a protrusion  231  which is movably engaged with the elongate slot  221 . One of the two end portions of each slat  12  is pivotably connected to the plate  24 . 
     Further referring to  FIGS. 3 and 4 , when the power unit  21  of the adjustment device  2  is activated, the arm  22  is pivoted upward or downward by the power unit  21 . Because the medial portion of each of the two end faces of each of the slats  12  is pivotably connected to the window frame  11 , and one of the two end portions of each slat  12  is pivotably connected to the plate  24 , so that when the arm  22  is pivoted, the link  23  is moved along with the movement of the protrusion  231  in the elongate slot  221  of the arm  22 . Therefore, the plate  24  is moved upward or downward, and the slats  12  are pivoted and set at desired angular position to introduce light into the room. 
     Besides, the adjustment device  2  may have a remote control receiving unit which is connected with the power unit  21 . The remote control receiving unit has a remote controller so that the users can operate the remote controller to send a command which is then received by the remote control receiving unit, and the power unit  21  is activated according to the command. By this way, the users do not need to approach the window blind  1  to operate the slats  12 . 
     The window blind  1  uses the adjustment device  2  to control the operation of the slats  12  to pivot the slats  12  to partially open or close so as to introduce light or air into the room conveniently. 
     While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.