US 2002/0153175 A1 · Rotatable cutting tool with isolated retainer stop

Abstract

A cutting tool assembly including a cutting bit having a head and a cylindrical shank portion of substantially constant diameter depending from the head as well as a bit holder including a cylindrical bore for receiving the cylindrical shank portion of the cutting bit. The shank portion includes an annular recessed groove. The cutting tool assembly further includes a retainer sleeve disposed between the shank portion of the cutting bit and the bore of the bit holder and which closely conforms about the shank portion while allowing the shank portion to rotate within the bore. The retainer sleeve includes at least one inwardly folded over stop tab that cooperates with the recessed groove to axially position the shank within the retainer. The retainer includes stop tabs that are bent around beyond the shear cut lines of the tab opening so that the hub portions of the shank do not transmit a force against these weakened shear cut areas of the retainer. The shank hub is positioned so that the hub rotates against only those portions of the retainer that are not weakened by shear line openings.

Claims31

Dependent claims

A cutting tool assembly, said assembly comprising:

a cutting bit having a head and a cylindrical shank portion of substantially constant outer diameter extending from said head, said shank portion including an annularly recessed groove;
a bit holder including a generally cylindrical bore for receiving said cylindrical shank portion of said cutting bit;
said cutting tool assembly further including a retainer sleeve disposed between said shank portion of said cutting bit and said bore of said bit holder and closely conforming about said shank portion while allowing said shank portion to rotate within said bore, said retainer including at least one stop tab received in said shank recessed groove to retain said cutting bit within said bore of said bit holder and to prevent axial removal of said cutting bit when in use while allowing rotatable movement of said cutting bit within said bore.

A cutting tool assembly, said assembly comprising:

a cutting bit having a head and a cylindrical shank portion of substantially constant outer diameter extending from said head, said shank portion including an annularly recessed groove;
a bit holder including a generally cylindrical bore for receiving said cylindrical shank portion of said cutting bit;
said cutting tool assembly further including a retainer sleeve disposed between said shank portion of said cutting bit and said bore of said bit holder and closely conforming about said shank portion while allowing said shank portion to rotate within said bore, said retainer including at least one stop tab received in said shank recessed groove to retain said cutting bit within said bore of said bit holder and to prevent axial removal of said cutting bit when in use while allowing rotatable movement of said cutting bit within said bore;
said at least one stop tab is folded over;
wherein said annularly recessed groove has two annular edge surfaces;
and
said at least one stop tab has a tip and bendtop;
whereby an outward most position of the cutting bit is limited by cooperation between said tip and an outward facing edge surface of said two annular edge surfaces.

5 more elements

Dependencies are inferred from the claim text.

Rotatable cutting tool with isolated retainer stop

Life of this patent

Rotatable cutting tool with isolated retainer stop

Life of this patent

Abstract

Claims31