Block and sleeve with rotation-inhibiting feature

An assembly, comprising:

• a holder block;
• a hollow sleeve;
• and
• a cutting pick,
• 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,
• 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,
• 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,
• wherein the front face includes a stop projecting forwardly past a plane of the front face, the stop positioned radially offset from 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, and
• wherein a shank of the cutting pick is inserted into the central bore of the hollow sleeve.

A hollow sleeve adapted to be mounted in a holder block and to receive a shank of a cutting pick, the hollow sleeve comprising:

• a shank portion;
• a head portion;
• and
• a shoulder portion,
• 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,
• wherein a central bore extends axially and rearwardly from an opening in a forwardmost surface of the head portion,
• wherein, in radial cross-section, outer peripheral edges of the shoulder portion have a shape of a first polygon.