| 摘要 |
PROBLEM TO BE SOLVED: To reduce an operating force of a button in opening or closing. SOLUTION: When the opening button 18 is pressed in closing states of door bodies 14 and 16, a Z-shaped arm 58 rotates and presses a connecting part 50A of a spring 50 to move the connecting part 50A from the end 44A (stable point) toward the end 44B along an engaging groove 44 formed in a large gear 32. Then, when the connecting part 50A of the spring 50 moves to the right end 44B of the engaging groove 44 beyond a neutral point, a force for counterclockwise rotating the large gear 32, as a component of a reaction force of the spring 50, is applied to the large gear 32. Therefore, even when the hand is separated from the opening button 18, an energizing force of the spring 50 rotates the large gear 32 in the direction for opening the door bodies 14 and 16.
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