| 摘要 |
PROBLEM TO BE SOLVED: To improve safety by preventing the malfunction of an operating section and the insufficient defective execution of operation. SOLUTION: In the opening-section device 1 composed of a frame body 2 comprising the three of at least an upper frame 2a and left-right vertical frames 2b, 2b and a door body 5 hung into the frame body 2 through hinges 3, 4, the upper hinge 3 has a pivot shaft 9 installed on the upper frame 2a and a bearing 10 mounted on the door body 5 in response to the pivot shaft 9, the pivot shaft 9 can be moved vertically by operating an operating section 11 exposed to the underside of the upper frame 2a, a concealing member 27 concealing the operating section 11 at a normal time is set up detachably to the underside of the upper frame 2a, and the operating section 11 is exposed by removing the concealing member 27 at a required time and can be operated.
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