FOLDING DOOR AND REVERSE FOLDING PREVENTION MECHANISM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a reverse folding prevention mechanism for a folding door and a folding door capable of preventing a folding door main body from reversely folding without requiring any special operation. SOLUTION: This reverse folding prevention mechanism 44 preventing the folding door main body 3 from reversely folding to the exterior B side is provided with a reverse fold preventing member 51, which is assembled to the lower end part of a folding connection part 35 freely movably in the vertically direction between a lower movement position facing a rail 16 in a sill 7 and an upper movement position retracted from the rail 16 and abutted on the rail 16 in the lower movement position for preventing the door main body from reversely folding, and upward and downward movement mechanisms 52 and 53 moving the reverse fold preventing member 51 to the lower movement position according to a terminal closing action of the folding door main body 3 and moving the reverse fold preventing member 51 to the upper movement position according to an initial opening action.