PROBLEM TO BE SOLVED: To make it possible to more reliably fix a cover body while taking advantage of the ease of attaching / detaching the cover body by using a snap lock. SOLUTION: A snap lock 51 provided in a cover body 41 is provided with a cover body 41 capable of opening and closing an opening of a housing body, and a fixing device 50 capable of changing a mounting position of the cover body 41 to a discharge position and a closing position. The snap lock 51 is provided with an engaging portion 42 provided on the housing body 40, and the snap lock 51 can swing relative to the operating member 53 to be swung and the swing fulcrum P2 of the operating member 53. A hook member 54 connected to the lock member 54 is provided, and a bolt connecting portion 60 for fixing the operating member 53 to the cover body 41 at a position away from the swing fulcrum P2 is provided, and the bolt connecting portion 60 is used to swing the operating member 53. Within the range, the hook member 54 is connected to the operating member 53 in a region on the slack side of the dead point line DP connecting the engaging position of the hook member 54 with respect to the engaging portion 42 and the position of the swing fulcrum P2. It is provided so that the location is located. [Selection diagram] Fig. 5【課題】パッチン錠を用いることによるカバー体脱着の簡便さを活かしながら、カバー体の固定をより確実に行えるようにする。【解決手段】ハウジング本体の開口を開閉可能なカバー体４１を備え、カバー体４１の装着位置を排出位置と閉塞位置とに変更可能な固定装置５０が、カバー体４１に備えられたパッチン錠５１と、ハウジング本体４０に設けられた係合部４２と、を備え、パッチン錠５１が、揺動操作される操作部材５３、及び操作部材５３の揺動支点Ｐ２から離れた位置で相対揺動可能に連結されたフック部材５４を備え、揺動支点Ｐ２から離れた位置で操作部材５３をカバー体４１に固定するボルト連結部６０が備えられ、ボルト連結部６０は、操作部材５３の揺動操作範囲のうちで、係合部４２に対するフック部材５４の係合位置と、揺動支点Ｐ２の位置と、を結ぶデッドポイント線ＤＰよりも弛み側の領域に、操作部材５３に対するフック部材５４の連結箇所が位置するように設けられている。【選択図】図５
