| 摘要 |
PROBLEM TO BE SOLVED: To facilitate arcuate pivotal opening/closing and operation of attachment/detachment of a lid by pressing a stop plate against a stop plate spring only when the lid is to be removed and by opening an upper end insertion port to make a hinge pin of the lid removable. SOLUTION: A hinge 9 of a shoulder member 4 is equipped with a vertically movable stop plate 24 for preventing it from coming out of an upper end insertion port through an insertion part by a hinge pin 11 of a lid 7 fitted in a groove 12 of a hook-like lock 13, and a stop plate spring 25 is provided, which presses down the stop plate 24. The stop plate 24 is pressed down against the stop plate spring 25, and while the insertion part between the hook-like lock 13 of the hinge 9 and a front wall 16 is wide open, the hinge pin 11 of the lid 7 is moved forward from the groove 12 of the lock 13, whereby the pin 11 is pulled upward from the upper end insertion port which is wide open between the lock 13 and the front wall 16 to make it removable. |
