Patent ID: 6932289

Claim:
A jaw crusher, comprising: a frame; a stationary jaw; a moveable jaw, the moveable jaw shiftably mounted to the frame and being moveable toward and away from the stationary jaw, the stationary jaw and the movable jaw defining a crushing chamber there between; and a tramp iron relief system operatively connecting a portion of the moveable jaw to the frame, the tramp iron relief system comprising: a hydraulic cylinder, the hydraulic cylinder in operative communication with an oil supply; a rod, the rod including a first end disposed within the cylinder and a second end operatively connected to the moveable jaw; a first piston disposed within the cylinder and fixed to the rod adjacent the first end of the rod; a second piston disposed within the cylinder and shiftably mounted to the rod, the first piston and the second piston cooperating to define an adjustable cavity there between; and the rod including a bore, the bore having a first bore disposed within the adjustable cavity and a second bore disposed adjacent the second end of the rod, the bore arranged to communicate oil from the oil source into and out of the adjustable cavity.