Patent ID: 8727451
Filing Date: 2014-05-20
Classification: E01C,E02F,E21C

Abstract:
1. A tool and block assembly, comprising: a holder including a body having a bore extending axially from a first side to a second side; and a grading pick rotatably mounted in the bore of the block, the grading pick including a head portion, a shank portion extending rearwardly from the head portion, and a first polygonal portion and a second polygonal portion disposed on the grading pick, wherein the shank portion of the grading pick includes the first polygonal portion, wherein the first polygonal portion of the shank extends from the bore rearwardly past the second side of the body to expose the first polygonal portion, wherein a circumference of a cross-section of the first polygonal portion has a shape of a first polygon, wherein the head portion of the grading pick further comprises a shoulder region that includes the second polygonal portion and a circumference of a cross-section of the second polygonal portion has a shape of a second polygon, and wherein the grading pick has a longitudinal axis and has both rotational symmetry and reflection symmetry along the longitudinal axis.