Patent ID: 6015108
Filing Date: 2000-01-18
Classification: E02F,E04G

Abstract:
A crusher comprising a frame having a pair of side plates, a fixed jaw fixed to said frame, a movable jaw pivotally supported on said frame at a position opposite said fixed jaw, a first hydraulic cylinder for opening and closing said movable jaw relative to said fixed jaw, a magnet case mounted between said pair of side plates of said frame, a permanent magnet assembly slidably mounted in said magnet case, and a second hydraulic cylinder connected to said permanent magnet assembly for sliding said permanent magnet assembly in said magnet case,wherein said first and second hydraulic cylinders are operatively associated with each other,wherein said permanent magnet assembly comprises:an open-bottomed box-shaped yoke formed of a magnetizable material;a permanent magnet mounted in said yoke; anda coupling member provided on an upper outer surface of said yoke, said coupling member being coupled to a piston rod of said second hydraulic cylinder.