Abstract: The present invention provides a runner crushing device which is capable of breaking runners of complicated shape, with no broken runners sticking to its blades, and which has an advantageous effect that broken runners can be completely recovered. The device is constituted of a receiving blade and a hydraulically operated pushing blade. The receiving blade includes a plurality of plate-like longitudinal receiving blades having a predetermined height, and a plurality of transverse receiving blades each disposed between adjacent plate-like longitudinal receiving blades in a substantially orthogonal relationship thereto. The pushing blade includes cross-shaped pushing blade single bodies having a predetermined height juxtaposed in a plurality of rows, with each pushing blade single body being capable of entering a blade space defined between the longitudinal receiving blades and the transverse receiving blades in the receiving blade.

Abstract: A conventional crusher forms a hollow space between paralleled straight portions of a wedge body portion and inner side surfaces of expanding members at the time of performing an expanding operation and hence, an expanding force of tapered portions of the wedge is not transmitted to the whole expanding members whereby the force is dispersed and a large crushing force cannot be obtained.

Abstract: A conventional crusher forms a hollow space between paralleled straight portions of a wedge body portion and inner side surfaces of expanding members at the time of performing an expanding operation and hence, an expanding force of tapered portions of the wedge is not transmitted to the whole expanding members whereby the force is dispersed and a large crushing force cannot be obtained.