| 摘要 |
PURPOSE:To prevent issuance of abnormal sound by providing a door with which a frontage is covered, rails on opposite sides of the frontage, couplings, movable support members and the like, and by extending and retracting a piston rod of a cylinder in order to completely and safely opening the frontage while forming an eaves. CONSTITUTION:A door body 21 with which a frontage 11 is covered, is folded at a fold part 22, and rails 23 are laid on opposite sides of the opening 11 for fixing the door during shutting and for guiding the same during opening. In this phase, the upper ends of left and right parts of the door body 21 are coupled to the rails 23 by means of coupling and support members 24, and the lower ends of the left and right parts of the door body are connected thereto with movable support members 25 so that the door body is vertically moved on the rails 23. Further, pressure fluid is fed into a cylinder device 26 so as to extend and retract a piston rod 26 in order to bifold the door body 2 which therefor forms an eaves while opens the opening 11. Accordingly, the opening and closing operation can be made quietly in a short time, and the door body 11 can surely be fixed to the building during closing. |
