Abstract: In a housing structure for a lawn mower, a rear scroll guide member is provided adjacent and along the width of an entrance of a cut-grass discharge passage, and this rear scroll guide member has upper and lower flanges together defining a channel-shaped concave portion for insertion and retention therein of a front end portion of a bottom plate that closes the bottom of the cut-grass discharge passage. Back plate is provided adjacent and along the width of an exit of the cut-grass discharge passage, and this back plate has a locking hole. The bottom plate has, on its rear end portion, a projection for fitting engagement with the locking hole of the back plate. Thus, the bottom plate is secured to the body of the housing with the front end portion inserted in the concave portion of the rear scroll guide member and the projection on the rear end portion fitted in the locking hole of the back plate.

Abstract: In a housing structure for a lawn mower, a rear scroll guide member is provided adjacent and along the width of an entrance of a cut-grass discharge passage, and this rear scroll guide member has upper and lower flanges together defining a channel-shaped concave portion for insertion and retention therein of a front end portion of a bottom plate that closes the bottom of the cut-grass discharge passage. Back plate is provided adjacent and along the width of an exit of the cut-grass discharge passage, and this back plate has a locking hole. The bottom plate has, on its rear end portion, a projection for fitting engagement with the locking hole of the back plate. Thus, the bottom plate is secured to the body of the housing with the front end portion inserted in the concave portion of the rear scroll guide member and the projection on the rear end portion fitted in the locking hole of the back plate.

Abstract: A cutter housing for use in a power-driven lawn mower has a substantially cylindrical skirt wall and a top wall covering the upper end of the skirt wall. The top wall has a substantially central recess for accomodating the engine of the lawn mower and includes a pair of half members positioned one on each side of the recess and lying substantially flush with each other in symmetrical and contiguous relation. The cutter housing also has a rear housing portion extending rearwardly in contiguous relation to the skirt wall and the top wall, and a partition disposed in the rear housing portion and dividing the rear housing portion into two spaces. The skirt wall, the top wall, the rear housing portion, and the partition are integrally molded of synthetic resin.