Abstract: The crusher of this invention has a conical crushing head that gyrates in an annular lower frame member. An upper frame member that seats on the lower frame member in a normal operative position comprises a bowl that cooperates with the head to define a crushing gap. Upright, circumferentially spaced double-acting hydraulic jacks are connected between the lower frame member and a tie ring surrounding it; and upright, circumferentially spaced tie rods connect the tie ring with the upper frame member. Preferably the piston rods of the jacks project downward. The upper jack chambers are normally communicated with a fluid pressure system that maintains fluid in them at a predetermined pressure and comprises an accumulator charged by a hydraulic pump that is controlled by a pressure responsive switch. A relief valve near each jack vents fluid from its upper chamber to its lower one when pressure in said upper chamber exceeds said predetermined value by a predetermined amount, as when tramp iron lifts the bowl.

Abstract: In a crusher having a gyratory conical crushing head that cooperates with an annular bowl, the bowl has a threaded connection with a frame member, to be adjustable up and down by rotation. A clamping ring, acting like a jam nut, also has a threaded connection with the frame member and is so connected with the bowl as to be constrained to rotate with it; but normally the bowl and clamping ring are biased towards one another under clamping force, to prevent bowl rotation. To release the bowl for rotation, pressurized air is injected between the bowl and the clamping ring, acting directly on them to overcome clamping force and being introduced via the helical passage defined by the threaded connection between clamping ring and frame member. Seals between the bowl and clamping ring, and between the bowl and frame member, prevent escape of the air.

Abstract: A jaw crusher for the reduction of rock and ore and including a toggle beam and a transversely shiftable wedge at each end of the beam whereby the toggle beam is wedged downwardly into position in the way slots of the crusher side walls and locked therein. Means are provided between the beam ends and the wedges for shifting the wedges in beam locking and unlocking directions. Lifting of these extremely heavy toggle beams is not necessary in order to effect their removal.

Abstract: A securing means for supporting a stationary die plate in a jaw crusher including the combination of angular cored pockets located in the vertical side walls of the stationary die plate and a plurality of lever-like angular wedges which are receivable in the pockets in such a manner that the stationary die plate can be forced against a supporting wall. The lever-like wedges are pivotably mounted against side walls of the jaw crusher and are bolted to the side walls in such a manner that tightening of the bolts causes the ends of the wedges which are received in the angular pockets of the die plates to apply compressive forces against the die plate forcing the die plate against the supporting wall.