| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a planar space required for opening and closing the door of a pass box. SOLUTION: One end of two S-curved arms having nearly the same shape is vertically separated at a fixed interval and rotatably fixed to the door of the pass box and the other end is likewise vertically separated at a fixed interval and rotatably fixed to the body of the pass box. Two S-curved arms are fitted to the door and the body of the pass box nearly in parallel, and the door is vertically opened and closed upward and downward.
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