| 摘要 |
PROBLEM TO BE SOLVED: To flatly cover an opening edge by forming first and second lids in such a manner that the upper surfaces can be bent in the approaching direction with the connected section of the lids as a rotating center for a lid body which is suitable to be used for the opening of a hopper of a concrete mixer vehicle. SOLUTION: A lid body comprises a lid body main body 10 comprising a lid 11 and a lid 12, connecting rods 22, 22 which are erected at both side end edges in the vicinity of one end edge of the lid 11, and rotating shaft 44 which is arranged at one end edge of the lid 12, and one end edge of the lid 11 and the other end edge of the lid 12 are approachably connected with hinges 13.... For the opening/closing mechanism for such a lid body, both end sections of the rotating shaft 44 are respectively engaged with an engaging member 30 which is respectively arranged in the vicinity of both side end sections of the lid 12, and at the same time, connecting rods 21 of which the other ends are hinge-bonded through a connecting shaft 24 in parallel with the lid body 11 under a state wherein the opening is completely closed in the direction of the lid 11 from the engaged place of the rotating shaft 44, are respectively arranged, and at one end of the rotating shaft 44, an actuator 41 is provided.
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