Coal and rock cutting pick

摘要

The pick ( 1 ) includes a radially inner end ( 4 ) and a shank ( 3 ) to be fixed to the drum ( 10 ) to substantially prevent relative movement between the pick ( 1 ) and drum ( 10 ). The pick ( 1 ) further includes a cutting head ( 2 ) having leading ( 5 ) and trailing faces ( 6 ) intersecting to provide a cutting edge ( 8 ) to extend generally parallel to an axis. The leading face ( 5 ) in use is inclined by an acute rake angle R to a radius of the axis, with the trailing face ( 6 ) being inclined at an acute back clearance angle B to a plane passing through the edge ( 8 ) and normal to the radius. The leading face ( 5 ) and trailing face ( 6 ) being inclined by an acute angle and the shanks when fixed to the drum ( 10 ) extends at an acute angle to the radius.