Hinge device for upward opening/closing door

A hinge device for an upward opening/closing door according to the present invention comprises: a housing fixed to a body; a shaft inserted into the housing and connected to the cover; a torsion spring which is provided between the housing and the shaft and provides a torsional elastic force to automatically open the cover; an elastic force adjustment part which is provided on one side of the housing and adjusts the elastic force of the torsion spring; and a free opening part that forms a free opening section that is not affected by the elastic force of the torsion spring when the cover is opened so as to absorb an impact when the cover is opened, thus the elastic force of the torsion spring can be adjusted in accordance with the weight of the cover, and the impact can be absorbed when thecover is opened without an additional shock absorbing device. 本发明的向上开闭式门的铰链装置包括：外壳，固定于本体；轴，向上述外壳的内部插入并与罩相连接；扭力弹簧，设置于上述外壳与轴之间，提供扭转弹力，使罩自动开启；弹力调节部，设置于上述外壳的一侧，来调节扭力弹簧的弹力；以及自由开启部，形成当上述罩进行开启动作时不受扭力弹簧的弹力影响的自由开启区间，以便在罩进行开启动作时吸收冲击，从