LIFT PREVENTION DEVICE FOR AUTOMATIC DOOR

摘要

PROBLEM TO BE SOLVED: To provide a lift prevention device for an automatic door capable of reducing an occurrence of a lift as much as possible when the automatic door opens and closes and eliminating a wear of a rail and noise.

SOLUTION: An automatic door 11 has hanging frames 19 at a door tip side and a door tail side where door rollers 17 are provided respectively. The door rollers 17 are hanged on a rail 16 in a transom and the hanging frames 19 connected to a driving device opens and closes the automatic door 11. The rail 16 has a U-shape cross-section with an upward door roller moving plane 32 and a downward roller contacting plane 33. The door rollers 17 are hanged on the door roller moving plane 32 of the rail 16 so that the door rollers 17 can roll along the rail 16. The hanging frame 19, at least one at the door tail side, has a lift prevention roller 30 which rolls while contacting the roller contacting plane 33.

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