Exceptional crushing capacity with minimum power consumption is obtained by unique moveable jaw principle. The upper end of the jaw travels in a circular path driven by the eccentric shaft. The lower end oscillates through a short arc described by the toggle. The resultant jaw action is a forward and downward motion relative to the stationary jaw that crushes the sample and forces its discharge.

Heavy bronze bearings are sealed against dust and dirt and are lubricated by grease cups, so that no special greasing tools are required. Bearings may be taken up for wear, reversed on the shaft for more wear, and after long service, easily replaced.