Patent ID: 8506019

Claim:
A block and sleeve assembly, comprising: a holder block; and a hollow sleeve, wherein the hollow sleeve includes a body including a shank portion, a head portion, and a shoulder portion, and a central bore extending axially and rearwardly from an opening in a forwardmost surface of the head portion, the central bore to receive a shank of a cutting pick, wherein the shank portion, head portion and shoulder portion are arranged longitudinal along a central axis with the shoulder portion separating the shank portion from the head portion, and wherein, in radial cross-section, outer peripheral edges of the shoulder portion have a shape of a first polygon, wherein the holder block comprises a base portion and a body portion, the body portion including an opening extending longitudinally from a front face to receive the shank portion of the hollow sleeve, and wherein the front face includes a stop projecting forwardly past a plane of the front face, the stop positioned radially offset from a circumference of the opening to allow a rearward surface of the shoulder portion of the hollow sleeve to contact the front face of the holder block and to prevent rotation of the hollow sleeve greater than N degrees, N = 360 n , where n is the number of sides of the first polygon.