Abstract: A jaw-type rock crusher has a stationary jaw, a cantilevered swing jaw driven by a toggle drive system, and a top feed opening above the crushing chamber formed between the two jaws. Two lateral hinge supports having an elevated horizontal hinge axis which lies in a plane generally bisecting the crushing chamber hingedly engage lateral support arms forming the upper hinge section of the swing jaw. In accordance with the invention, the lateral hinge supports and the swing jaw's upper support arms straddle the frame of the crusher and its top feed opening to allow the top feed opening to extend behind the swing jaw's hinge axis thereby permitting larger rock to be fed into the crusher and permitting easier access into the crusher for the purpose of dislodging or breaking up over-sized rock. A shock-absorbing back wall positioned behind the hinge axis near the top of the crusher prevents the impact forces of rock fed into the feed opening at high velocities from being fully absorbed by the swing jaw's bearings.