Patent ID: 8584402
Filing Date: 2013-11-19
Classification: E05F,E05Y,Y10T

Abstract:
1. A door opening and closing system comprising: a catch which is mounted at either one of a door and a frame; and a door opening and closing device which is mounted on an opposite one of the door and the frame and has a retractable arm that is engaged with the catch, in which, when the door gets closed, the retractable arm of the door opening and closing device is engaged with the catch and the retractable arm rotates about an arm axis to give the door a force in a closing direction, wherein the catch has a catch base which is mounted on the one of the door and the frame and a catch shaft which is installed in the catch base slidable in an axial direction and engaged with the retractable arm, the catch shaft has a main body part which is engageable with the retractable arm and a step part which is provided at a tip end of the main body part by hollowing at least a part of the main body part in a circumferential direction and engageable with the retractable arm, and the step part of the catch shaft and the retractable arm are engaged with each other in a state where the retractable arm is rotated more in the closing direction than in a state where the main body part of the catch shaft and the retractable arm are engaged with each other.