double-toggle jaw crusher

A jaw crusher in which the motion of the eccentric shaft is transmitted through the pitman to a toggle joint, formed by two toggle plates hinged together, at its lower end. The opposite end of one plate is hinged on the back plate and the opposite end of the other at the load point, ie the jawstock. The effort applied at the common hinge point causes the obtuse angle between the plates to increase and considerable force is produced at the jawstock.[img_assist|nid=11937|title=|desc=|link=none|align=center|width=406|height=288]