Patent ID: 6116530
Filing Date: 2000-09-12
Classification: B02C

Abstract:
A jaw crusher for crushing rock having a fixed jaw mounted on a frame and a movable jaw mounted on said frame and connected to a drive for cyclable movement of said movable jaw toward and away from said fixed jaw, said movable jaw and said fixed jaw adjacent a lower edge of said movable jaw being spaced and define a bite therebetween, said bite between said jaws being variable by adjusting a double acting hydraulic cylinder arrangement extending between the lower edge of said movable jaw and said frame, said hydraulic cylinder arrangement allowing movement of said movable jaw from a narrow bite position between said jaws to an open bite position which allows removal of obstructing material between said jaws, said jaw crusher further including a tensioning arrangement for biasing said movable jaw against said double acting hydraulic cylinder and accommodating the cyclable movement of said movable jaw, said tensioning arrangement including at least one tensioning rod having one end thereof connected to said lower edge of said movable jaw and an opposite end cooperating with a biasing member applying a tensile force on said at least one tensioning rod to bias said movable jaw, and wherein said biasing member is an air spring structure.