Tool holder and base mounting assembly

1. A mounting assembly adapted for attachment to a surface of a rotatable driving member of a cutting tool machine and adapted for receiving a cutting tool, the mounting assembly comprising:

a base having a bottom portion for attachment to the surface of the rotatable driving member and a front portion that defines a bore; and

a tool holder configured for mounting to the base, the tool holder comprising:

a leading head region having a forward face that defines an aperture for receiving the cutting tool;

a trailing shank region with a central longitudinal axis and having an axial forward end and an axial rearward end; and

a mediate region intermediate of and contiguous with the leading head region and the trailing shank region;

wherein the trailing shank region comprises an anti-rotation portion and a mounting retention portion;

the mounting retention portion including at least one press fit portion;

wherein the anti-rotation portion and the mounting retention portion are configured as a unitary member, and are disposed fully and continuously about the central longitudinal axis of the trailing shank region when viewed in a plane that is transverse to, and intersects, the central longitudinal axis of the trailing shank region;

wherein the anti-rotation portion comprises at least two sides which are not rounded; and

wherein the anti-rotation portion is adjacent the axial rearward end of the trailing shank region;

wherein a portion of the bore of the base is configured to receive the anti-rotation portion; and

the at least one press fit portion of the mounting retention portion comprises a rearward surface which does not contact any surface of the bore when the anti-rotation portion is received in the bore.

2. The mounting assembly of claim 1 , wherein the at least two sides which are not rounded comprise at least one planar side.

3. The mounting assembly of claim 1 , wherein at least a portion of the anti-rotation portion tapers inwardly toward the axial rearward end of the trailing shank region.

4. The mounting assembly of claim 1 , wherein a portion of the bore of the base is configured to receive the anti-rotation portion of the trailing shank region.

5. The mounting assembly of claim 1 , wherein the at least one press fit portion includes a tapered press fit portion that tapers axially rearward toward the anti-rotation portion.

6. The mounting assembly of claim 5 , wherein the at least one press fit portion further includes a generally cylindrical press fit portion axially rearward of the tapered press fit portion and adjacent the anti-rotation portion.

7. The mounting assembly of claim 1 , wherein the bore of the base is configured for receiving at least a portion of the trailing shank region of the tool holder and an axial rearward end of the bore is configured to have a shape complimentary to the anti-rotation portion of the trailing shank region.

8. A tool holder of a mounting assembly adapted for attachment to a surface of a rotatable driving member of a cutting tool machine, the tool holder adapted for receiving a cutting tool, the tool holder comprising:

a leading head region having a forward face that defines an aperture for receiving the cutting tool;

a trailing shank region with a central longitudinal axis and having an axial forward end and an axial rearward end; and

a mediate region intermediate of and contiguous with the leading head region and the trailing shank region;

wherein the trailing shank region comprises an anti-rotation portion and a mounting retention portion;

wherein the anti-rotation portion and the mounting retention portion are configured as a unitary member, and are disposed fully and continuously about the central longitudinal axis of the trailing shank region when viewed in a plane that is transverse to, and intersects, the central longitudinal axis of the trailing shank region;

wherein the anti-rotation portion comprises at least two sides which are not rounded; and

wherein the anti-rotation portion is adjacent the axial rearward end of the trailing shank region; and

a chamfer disposed at the axial rearward end of the trailing shank region;

wherein the chamfer assists in alignment of the tool holder with respect to a bore, when mounting the tool holder in a bore.

9. The tool holder of claim 8 , wherein the at least two sides which are not rounded comprise at least one planar side.

10. The tool holder of claim 8 , wherein at least a portion of the anti-rotation portion tapers inwardly toward the axial rearward end of the trailing shank region.

11. The tool holder of claim 8 , wherein the mounting retention portion includes a tapered press fit portion that tapers axially rearward toward the anti-rotation portion.

12. The tool holder of claim 8 , wherein the mounting retention portion further includes a generally cylindrical press fit portion axially rearward of the tapered press fit portion and adjacent the anti-rotation portion.

13. A tool holder of a mounting assembly adapted for attachment to a surface of a rotatable driving member of a cutting tool machine, the tool holder adapted for receiving a cutting tool, the tool holder comprising:

a head having a forward face that defines an aperture for receiving the cutting tool; and

a shank with a central longitudinal axis and having an axial forward end and an axial rearward end, the shank comprising:

an anti-rotation portion; and

a mounting retention portion;

wherein the anti-rotation portion and the mounting retention portion are configured as a unitary member, and are disposed fully and continuously about the central longitudinal axis of the trailing shank region when viewed in a plane that is transverse to, and intersects, the central longitudinal axis of the trailing shank region;

wherein the mounting retention portion includes a tapered press fit portion that tapers axially rearward and a generally cylindrical press fit portion;

wherein the anti-rotation portion comprises at least two sides which are not rounded;

wherein the anti-rotation portion is adjacent the axial rearward end of the shank; and

wherein the tapered press fit portion, the generally cylindrical press fit portion and the anti-rotation portion each have an axial length, defined with respect to the central longitudinal axis;

the axial length of the anti-rotation portion being greater than the axial length of the tapered press fit portion and of the generally cylindrical press fit portion.

14. The mounting assembly of claim 2 , wherein the at least one planar side comprises two planar sides, which are interconnected when viewed in a plane that is transverse to, and intersects, the central longitudinal axis of the trailing shank region.

15. The mounting assembly of claim 14 , wherein:

the anti-rotation portion comprises two opposing planar sides and two opposing rounded ends;

the two planar sides and the two rounded ends combining to fully and continuously surround the central longitudinal axis of the trailing shank region when viewed in a plane that is transverse to, and intersects, the central longitudinal axis of the trailing shank region.

16. The mounting assembly of claim 2 , wherein the at least one planar side comprises a planar side defined by a flat, planar surface area.

17. The mounting assembly of claim 7 , wherein the anti-rotation portion engages with the complimentary shape of the axial rearward end of the bore solely via surface-to-surface engagement.

18. The mounting assembly of claim 6 , wherein:

the generally cylindrical press fit comprises the rearward surface which does not contact any surface of the bore when the anti-rotation portion is received in the bore.