Patent ID: 6375105
Filing Date: 2002-04-23
Classification: B02C

Abstract:
A jaw crusher comprising a housing that supports a stationary jaw and has a pair of opposed upright walls between which a movable jaw is suspended, each of said walls defines a way slot that is elongated in directions toward and from the stationary jaw, a toggle beam extending across the housing and having opposite end portions received in said way slots and substantially confined by them for slidable shifting in said directions, a toggle between said toggle beam and the movable jaw for supporting the latter, a toggle seat between said toggle and each of said beam and movable jaw for seating said toggle against said beam and movable jaw;double-acting hydraulic ram means having a cylinder and a double-acting piston extendable from one end of said cylinder, said piston having a connection with said toggle for shifting said toggle in said directions, said cylinder having a rigid connection with said housing and extending between said side walls; abutment means supported by the housing and engageable by the toggle beam for defining an adjustably variable limit of shifting thereof in one of said directions and thus providing a rigidly guided sliding toggle beam having a plurality of alternatively selectable positions of adjustment of the toggle beam; an hydraulic circuit connected to said cylinder for extending and retracting said piston; a tramp iron relief valve between opposite ends of said cylinder for providing a quick discharge path for oil in said cylinder to vent the latter to substantially lower pressure to thereby provide a rapid overload relief of said cylinder when tramp material is encountered in said crusher; a directional control valve in said circuit and connected with said ram means for retracting or extending said pistons; and said hydraulic circuit providing for power opening of said movable jaw to permit clearing of said crushing chamber when an unscheduled stop occurs due to failure of the electrical system, the drive means or excessive material in said crushing chamber.