Tool retainer

A cutting tool assembly comprising:

• a cutting bit having a head comprising of a body located longitudinally below a cutting element and a shoulder located below said body, and a cylindrical shank that has an outer wall having a longitudinal length that extends in a longitudinal direction from below said shoulder, and a recess groove that is located on said outer wall of said cylindrical shank;
• a cutting bit holder having an internal cylindrical bore and a front face, and wherein said internal cylindrical bore has a mouth, and wherein said internal cylindrical bore has a longitudinal length that extends in a longitudinal direction of said cylindrical shank, and wherein said internal cylindrical bore has an internal recessed radial groove;
• a washer having a center hole, and wherein said washer is located between said shoulder of said cutting bit and said front face of said cutting bit holder;
• and
• a cylindrical retainer sleeve having an outer wall, said cylindrical retainer sleeve has a longitudinal length, and a split that is located on the circumference of said outer wall that forms an opening on said cylindrical retainer sleeve and wherein said split extends in a longitudinal direction along the longitudinal length of said cylindrical retainer sleeve, and wherein said retainer sleeve having a single radially outward projecting longitudinal external tab located on said outer wall opposite the split, a first internal radial tab having a first convex portion, a second internal radial tab having a second convex portion, a third internal radial tab having a third convex portion, and a fourth internal radial tab having a fourth convex portion, and wherein said cylindrical retainer sleeve fits inside said internal cylindrical bore of said cutting bit holder, and wherein said cylindrical shank fits inside said cylindrical retainer sleeve, and wherein said outward projecting longitudinal external tab fits into said internal recessed groove of said internal cylindrical bore of said cutting bit holder, and wherein said first convex portion of said first internal radial tab, said second convex portion of said second internal radial tab, said third convex portion of said third internal radial tab, and said fourth convex portion of said fourth internal radial tab bias against and fit into said recess groove that is located on said outer wall of said cylindrical shank.

A cylindrical retainer sleeve comprising:

• a cylindrical outer wall that has a circumference and a longitudinal length, and a split that is located on the circumference of said outer wall that forms an opening on said cylindrical retainer sleeve and wherein said split extends in a longitudinal direction along the longitudinal length of said cylindrical retainer sleeve,
• said cylindrical retainer sleeve having a single radially outward projecting longitudinal external tab located on said outer wall on a side of said outer wall that is opposite said split, and a plurality of internal radial tabs, the plurality of internal radial tabs including a first internal radial tab having a convex portion, a second internal radial tab having a convex portion, a third internal radial tab having a convex portion, and a fourth internal radial tab having a convex portion;
• and
• said cylindrical retainer sleeve fitting-inside an internal cylindrical bore of a cutting bit holder, and wherein a cylindrical shank fits inside said cylindrical retainer sleeve, and wherein said single radially outward projecting longitudinal external tab fits into an internal recessed radial groove of said internal cylindrical bore of said cutting bit holder, and wherein said convex portion of said first internal radial tab biases against and fits into a recess groove that is located on an outer wall of said cylindrical shank, said second internal radial tab biases against and fits into the recess groove that is located on the outer wall of said cylindrical shank, said third internal radial tab biases against and fits into the recess groove that is located on the outer wall of said cylindrical shank, and said fourth internal radial tab biases against and fits into the recess groove that is located on the outer wall of said cylindrical shank.