Patent ID: 7341213

Claim:
A jaw crusher for crushing material, the jaw crusher comprising: a frame having a pair of opposing walls; a fixed jaw and a swing jaw disposed between said walls, the jaws defining a crushing chamber for receiving material to be crushed, the swing jaw mounted for cyclic movement in the direction of the fixed jaw a cross beam having first and second surfaces facing in opposite directions to one another, the cross beam adjustably disposed in a transverse axis of the frame; a toggle plate mounted in operative communication between a rear portion of the swing jaw and a first face of the cross beam wherein an hydraulic cylinder arrangement is on the opposite side of the cross beam from the toggle plate, in operative communication with a second face of the cross beam, and wherein the hydraulic cylinder arrangement is pressurised to a predetermined value greater than zero, in use, to provide an adjustable, pre-loaded reaction against the toggle plate wherein the hydraulic cylinder arrangement includes two cylinders, one on either side of the frame, with the longitudinal axis of each cylinder arranged in the same plane as a respective wall, in which an aperture is provided in each wall for movably receiving a respective end of the cross beam and the cylinders are each mounted in a respective aperture.