Problem to prevent passage of flame.In the opening / closing device in which the seat plate member 12 is brought into contact with or close to the abutment target position g in the closing direction when the opening / closing body 10 is closedSeat plate member 12The seat body portion 12a extending in the transverse direction andThe seat plate body 12a is provided with a seat plate cap 12b connected to the width direction end side.Seat cap capBetween the width direction end of the seat plate body 12a and the guide rail 20A closed portion B which closes the gap between the lower end of the switch body 11 at the time of full closure and the abutting object part G is provided.Block BA refractory shielding core 12b13 having a shape substantially blocking the gapThe shielding core portion 12b is covered with at least a portion closer to the closing direction and a covering portion formed of a soft material than the shielding core portion 12b.Diagram
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