| 摘要 |
<p>The present invention relates to an overhead door including two guiderails spaced apart from each other in vertical and horizontal directions; a shutter provided between the two guiderails to be opened and closed along the guiderails in a vertical direction; a driving shaft placed above the guiderails to be rotated by a driving motor; a spool joined to an end of the driving shaft; and a belt connected to the spool by one end and to the bottom of the shutter by the other end. According to the present invention, the overhead door opens and closes the shutter by making the belt be wound on or unwound from the spool, thereby allowing the quick, smooth, and silent opening and closing of the shutter.</p> |
