固定在外壳后方中心部位的上侧固定部件及下侧固定部件，其具有组装上述旋转轴的铰链孔；
A superior side fixation part and inferior side fixation part mounted in the center portion behind the outer casing, have butt hole for mounting the turning axis.
第二种方法是在翼面上装置铰链，用一个对不同安装角钻有不同孔的外部扇形件与之配合。
A second method is to furnish the surfaces with hinges and to use an exterior sector with drilled holes for each Angle setting.
附件：加强铰链，各种门锁，拉手，窥视孔和门铃。
Accessories: reinforce hinge, various locks, handle, peepholes and doorbells.
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