ASSISTANT OPENNING FORCE PROVIDING STRUCTURE FOR FIRE DOOR

摘要

A secondary opening force providing structure for a fire door is provided to open a fire door with a cam portion formed in the door knob and a supporting member supported in a door frame in case a door knob rotates in a specific direction. A secondary opening force providing structure for a fire door comprises: a door knob(10) axially installed at a mortise box locking and unlocking the fire door; a cam portion(11) formed in the door knob; and a supporting member(20) positioned between a door frame and the cam portion of the door knob. The fire door is opened with the supporting member and the cam portion in case the door knob is rotated in a specific direction.