Patent ID: 8152085

Claim:
A crusher in which hammer members that extend from a rotation shaft in a radial direction and rotate with a rotation of the rotation shaft are housed in a casing that includes an upper loading opening for loading an object to be crushed and a lower discharge opening for discharging a crushed object, fixed blades are arranged within the casing on an outer diameter side of the hammer members, and the hammer members and the fixed blades crush the object to be crushed when the hammer members are rotated, wherein: the casing comprises a curved surface, and a front wall and a back wall respectively configured at two ends of the curved surface, an opening is configured on the curved surface between the front wall and the back wall, plate fitting grooves are respectively formed on the front wall and the back wall of the casing and extended along a circular arc on the front wall and the back wall, respectively, the circular arc corresponding to a circular trajectory of a front end edge of the hammer members during a rotation of the hammer members in the casing, the opening that can be opened and closed by opening and closing operations of a lid member, and the fixed blades are attached to a curved holding plate, and the curved holding plate is fitted into the plate fitting grooves from the opening, and the plate fitting grooves at the opening are sealed by the closing operation of the lid member and the curve holding plate is thereby prevented from detaching from the plate fitting grooves, while the plate fitting grooves at the opening are exposed by the opening operation of the lid member and the curve holding plate is thereby removable from the plate fitting grooves.