| 摘要 |
PURPOSE: An auxiliary opening/closing device for a flap door is provided to maintain an open state of a door through a restoring force and a self-weight of the door, and of an elastic force to induce to close through a hinge of an existing door. CONSTITUTION: An auxiliary opening/closing device for a flap door comprises a housing (100), a torsion spring (200), a connection part, and a joint member. In the housing, a fixing unit (102) in one side and a hollow unit (104) in an inner side are formed, and a rotary shaft (120) is combined in the hollow unit. The torsion spring surrounds the rotary shaft. One end is fixed to an inner wall of the hollow unit. The other end is fixed to the rotary shaft. The torsion spring is braided and is loosen by corresponding to a weight of the flap door. In the joint member, a first rod and a second rod (420, 440) are folding and unfolding around a middle hinge. |
