AUTOMATIC DOOR CLOSING DEVICE FOR SLIDING DOOR, SLIDING DOOR DEVICE HAVING THE AUTOMATIC DOOR CLOSING DEVICE MOUNTED THERETO, AND AUTOMATIC DOOR CLOSING DEVICE KIT

摘要

An easily mountable automatic door closing device for a sliding door. The device has a flexibly woundable door closing cord (18) mounted to a door frame so as to extend in the opening and closing direction of the sliding door (20), a rotating member (32) mounted to the sliding door so as to be rotatable about an axis located at a predetermined position, an engagement holding member (36) for engaging the door closing cord with the peripheral surface of the rotating member, and a spring device which, when the rotating member rolls on the door closing code as the sliding door is moved from a door-closed position to a door-open position, accumulates in the spring device an urging spring force for rotating the rotating member in the direction opposite the direction in which the rotating member rolls.