Fire door

A fire door that is to be attached to a wall surface of a wall body that has an opening, the fire door comprising:

• an outer frame that is fixed to the wall body;
• a door body that is guided by the outer frame so as to move in a slide direction along the wall surface, thereby opening and closing the opening;
• and
• a center rail that is attached to the outer frame,
• wherein:
• an area in which the door body is located in a state where the opening is closed is defined as a first area, an area in which the door body is located in a state where the opening is open is defined as a second area, a direction that is orthogonal to the wall surface of the wall body is defined as a wall orthogonal direction, a direction that is orthogonal to the slide direction in a wall orthogonal direction view that is a view in the wall orthogonal direction is defined as a width direction, the first area side with respect to the second area in the slide direction is defined as a slide direction first side, and the second area side with respect to the first area in the slide direction is defined as a slide direction second side,
• the outer frame includes a first frame portion that is located on a width direction first side that is one side in the width direction with respect to the first area and the second area so as to extend in the slide direction, and a second frame portion that is located on a width direction second side that is the other side in the width direction with respect to the first area and the second area so as to extend in the slide direction,
• the center rail is provided so as to overlap a target area in the wall orthogonal direction view, where the target area is an area on the slide direction second side in the first area with respect to the opening in the wall orthogonal direction view, and so as to extend in the width direction between the first frame portion and the second frame portion on the side opposite to the wall body with respect to the target area,
• the center rail and the first frame portion are fixed to each other so as to prohibit movement of the center rail relative to the first frame portion in the slide direction, the width direction, and the wall orthogonal direction, and the center rail and the second frame portion are engaged with each other with an engaging mechanism interposed therebetween,
• the engaging mechanism is configured to allow relative movement of the center rail relative to the second frame portion in the width direction, and to regulate the relative movement thereof in the wall orthogonal direction and the slide direction,
• a portion of the center rail that overlaps the first frame portion in the wall orthogonal direction view, of the center rail, is defined as a first portion, a portion of the center rail that overlaps the second frame portion in the wall orthogonal direction view, of the center rail, is defined as a second portion, the first portion is fixed to the first frame portion, and the second portion is engaged with the second frame portion with the engaging mechanism interposed therebetween,
• one side in the wall orthogonal direction on which the center rail is disposed relative to the door body is defined as a wall orthogonal direction first side, and the other side in the wall orthogonal direction on which the wall body is disposed relative to the door body is defined as a wall orthogonal direction second side,
• the first frame portion includes a first front-side main body having a portion facing the door body from the wall orthogonal direction first side,
• the second frame portion includes a second front-side main body having a portion facing the door body from the wall orthogonal direction first side,
• the first portion of the center rail is accommodated in a space in the first front-side main body,
• the second portion of the center rail is accommodated in a space in the second front-side main body, and
• the center rail is disposed so as not to protrude on the wall orthogonal direction first side from the first frame portion and the second frame portion.