PURPOSE:To reduce the cost of facilities by a method in which a door to be closed under its own weight, having a smaller height than the height from floor to ceiling, is formed along the inclined rails of a wall, and a blocking plate to be vertically moved by an operating lever is provided on the upside of the door. CONSTITUTION:A fixed rail 41 inclined toward the opening 4 is set on a wall 3, and a sliding rail 42 to be coupled with the rail 41 is also set on the door body 50. A moving rail 40 is made up of the rails 41 and 42. The height (h) of the door body 50 is made smaller by an aperture(g) than the height from a floor 9 to the downside of a slab 8, and a blocking plate 20 to block the aperture is set on the upside of the door body 50 and vertically moved by an operating lever 30. In case of fire, etc., a fire-proof door 5 moves from the position(a) to the position(b) to block the opening 4. The cost of facilities can thus be cut down.
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