EXCAVATOR BUCKET TOOTH Russian patent published in 1998 - IPC

FIELD: earth excavation machinery and equipment. SUBSTANCE: this particularly relates to cyclic-action single-bucket excavators and can be used in mining and construction industries for crushing and excavating various type of ground of any hardness category. For prolonging service life of teeth and front wall of excavator bucket, tooth having shank, working part made up of upper and lower curvilinear faces with cutting part, cutting part is displaced upwards relative to longitudinal axis of tooth by 0.05-0.09 with respect to length of tooth. Upper and lower faces of tooth are provided with longitudinal ribs. Upper face is created by three conjugated cylindrical surfaces, respectively convex, concave, and convex with radii of curvature being within 400-550, 250-350, 450-550 mm accordingly. Upper stiffening rib is formed by four cylindrical surfaces namely convex, concave, concave, and convex with radii of curvature being within 400-550, 900-1100, 350-450, 100-140 mm respectively. Lower face in cutting part area is configured as concave cylindrical surface with radius of curvature being within 700-900 mm, and further up to shank it is formed by two conjugated concave and convex cylindrical surfaces with radii of curvature being within 200-300 and 450-550 mm respectively. Lower rib is formed by two conjugated concave and convex cylindrical surfaces with radii of curvature being within 700-900 and 900-1100 mm respectively. EFFECT: higher efficiency. 1 cl, 3 dwg