PROBLEM TO BE SOLVED: To provide a device for opening and closing a conveying passage fixed to a through-hole of the wall of a building such as a henhouse and capable of preventing movement of a small animal such as a rat or a mouse and invasion of the outside air and the like.SOLUTION: The opening and closing device 1 is pivotally supported with the body 6 of the device having a U-shaped cross-section and placed on one side of the through-hole of the building wall and the inside surfaces 29 of sideboards 17a, 17b of the body 6 of the device, has a planer opening and closing shutter 8 displacing between a closed position for closing a transport conveyor installed through the through-hole and an opened position for opening the conveying passage, the base part 10 of a link support fixed to the upper board 18 of the body 6 of the device, a long rectangular main arm 12 to which the opening and closing shutter 8 is rotatably connected, and a long rectangular side arm 13 for rotatably connecting each of a nearly middle part of the long rectangular main arm 12 and the base part 10 of the link support, and includes a link mechanism unit 14 for holding the opening and closing shutter 8 at the closed position and the opened position depending on positional change of the center of gravity.COPYRIGHT: (C)2013,JPO&INPIT【課題】鶏舎等の建物壁の貫通孔に取付けられ、ネズミ等の小動物の移動及び外気等の侵入を防ぐことが可能な搬送路開閉装置の提供を課題とする。【解決手段】開閉装置1は、建物壁の貫通孔の一方に配設された断面コの字形状の装置本体6と、装置本体6の側板17a,17bの内側面29に枢支され、貫通孔に挿設された搬送コンベアの搬送路を閉塞する閉塞位置及び搬送路を開放する開放位置の間で変位する平板状の開閉シャッタ8と、装置本体6の上板18に取設されたリンク支持基部10と、開閉シャッタ8が回動自在に連結された長片状の主アーム12、及び主アーム12の中間付近とリンク支持基部10の一部とをそれぞれ回動自在に連結する長片状の副アーム13を有し、重心位置の変化によって閉塞位置及び開放位置に開閉シャッタ8を保持するリンク機構部14とを具備する。【選択図】図1
