A device for securing the stationary jaw to the frame of a jaw crusher according to the present invention provides better, more positive side-to-side securement of the stationary jaw to the crusher frame, thus increasing the efficiency and prolonging the service life of the crusher.
According to one aspect of the invention, a jaw crusher includes a frame having a generally vertical base extending between a pair of spaced apart side portions, with each of the side portions including an angled ledge spaced from the base. A generally planar stationary jaw is mounted to the base and extends between the frame side portions, with the stationary jaw having a top edge, a bottom edge, and interconnecting side edges. Each of the stationary jaw side edges includes a beveled lug extending along its length. A pair of generally wedge shaped key plates are provided, with each of the key plates being mountable to an adjacent frame side portion and including a beveled first edge adapted to engage an adjacent beveled side lug of the stationary jaw. Each of the key plates further includes a second edge adapted to engage an adjacent ledge of the frame side portion. Accordingly, in response to downward movement of the key plates the stationary jaw is pressed generally horizontally against the frame base with the engaging beveled surfaces of the key plates and the side lugs cooperating to prevent side-to-side movement of the stationary jaw.
In further accordance with a preferred embodiment, each key plate is adapted for connection to its adjacent frame side portion, such as by a plurality of bolts or fasteners. Moreover, the bevel on each side lug of the stationary jaw is angled to match the bevel on the first side edge of the adjacent key plate. Each key plate thus cooperates with its opposing key plate to apply a centering force to the stationary jaw, which centering force may be steplessly increased in response to downward movement of the key plates. Each key plate may be divided into a top portion and a bottom portion, with each top and bottom portion being independently mountable to its adjacent frame side portion.
According to another aspect of the invention, a jaw crusher includes a frame having a mounting base extending between a pair of spaced apart sidewalls, with each of the sidewalls including a ledge spaced from, and being angled relative to, the mounting base. A stationary jaw is mounted to the mounting base and extends between the frame sidewalls. The stationary jaw includes a top edge, a bottom edge, and interconnecting side edges, with a portion of each jaw side edge defining a beveled lug. A generally wedge shaped key plate is vertically and removably mounted to each of the frame sidewalls. Each key plate includes a beveled first edge adapted to engage an adjacent beveled side lug of the stationary jaw, and each key plate further includes a second edge adapted to engage an adjacent ledge of the frame sidewall. Each key plate is downwardly moveable to thereby force the jaw against the mounting base, with the beveled first edge of each key plate cooperating with its adjacent beveled side lug to thereby prevent side-to-side movement of the stationary jaw.
According to yet another aspect of the invention, a jaw crusher comprises a frame having a generally vertical mounting base extending between a pair of spaced apart sidewalls. Each of the sidewalls includes a ledge spaced from and angled relative to the mounting base. A stationary jaw is mounted to the mounting base and extends between the frame sidewalls, with the stationary jaw having a top edge, a bottom edge, and interconnecting side edges. A pair of generally wedge shaped key plates are provided, with each key plate being vertically and removably mounted to one of the frame sidewalls so as to engage one of the jaw side edges and an adjacent one of the sidewall ledges. Means, carried by cooperating and engaging portions of each key plate and each jaw side edge, are provided for applying a stepless and progressively greater centering force to the jaw in response to downward movement of the key plates.
According to a still further aspect of the invention, on a jaw crusher having a frame, a stationary jaw, and a pair of key plates adapted for vertically sliding engagement with opposing sidewalls of the frame for securing the stationary jaw to the frame, a method of applying a centering force to the stationary jaw comprises the steps of providing a beveled first edge on each of the key plates, providing a beveled side lug on opposing sides of the stationary jaw, sliding each key plate into engagement with the frame such that each beveled first edge engages an adjacent beveled side lug of the stationary jaw, and securing each key plate to its adjacent frame sidewall.
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