BIT ASSEMBLY FOR CUTTER HEAD

1 . A bit assembly for a cutting drum, the bit assembly comprising:

a sleeve including shank portion, a flange positioned adjacent an end of the shank portion, and a bore extending through the flange and the shank portion, the flange including a first end surface, a second end surface, and a sleeve outer surface extending between the first end surface and the second end surface, a portion of the sleeve outer surface positioned adjacent the first end surface defining a sleeve profile; and

a bit including a cutting end, a shank, and a shoulder positioned between the cutting end and the shank, at least a portion of the shank positioned within the bore of the sleeve, the shoulder positioned adjacent the first end surface of the sleeve, the bit further including a bit outer surface extending between the cutting end and the shoulder, a portion of the bit outer surface positioned adjacent the shoulder defining a bit profile that corresponds to the sleeve profile.

2 . The bit assembly of claim 1 , wherein an imaginary surface aligned with a contour of the sleeve profile and extending beyond the first end of the sleeve is aligned with a contour of the bit profile.

3 . The bit assembly of claim 1 , wherein the bit profile defines a first frustoconical shape and the sleeve profile defines a second frustoconical shape, the first frustoconical shape and the second frustoconical shape having an identical, constant slope.

4 . The bit assembly of claim 1 , wherein the entire length of the sleeve outer surface defines the sleeve profile, and wherein the entire length of the bit outer surface defines the bit profile.

5 . The bit assembly of claim 1 , wherein an end surface of the bit shoulder is spaced apart from the first end surface of the sleeve by a gap.

6 . The bit assembly of claim 1 , wherein the bit is freely rotatable relative to the sleeve about a bit axis extending along the shank.

7 . The bit assembly of claim 1 , wherein the sleeve profile is a first end sleeve profile, a portion of the sleeve outer surface positioned adjacent the second end surface defining a second end sleeve profile, the bit assembly further comprising:

a holder including a holder end surface, an opening positioned on the holder end surface, and a holder outer surface, the opening receiving the shank portion of the sleeve, the holder end surface positioned adjacent the second end surface of the flange, a portion of the holder outer surface positioned adjacent the holder end surface defining a holder profile, the holder profile corresponding to the second end sleeve profile.

8 . The bit assembly of claim 1 , wherein the bit includes a bit body and an insert, the bit body extending between a body end and the shoulder, the bit including an aperture positioned adjacent the body end, the insert positioned at least partially within the aperture and including a tip,

wherein the bit profile is a shoulder end bit profile, a portion of the bit outer surface positioned adjacent the body end defining a body end bit profile,

wherein the insert includes an insert outer surface, at least a portion of the insert outer surface defining an insert profile that corresponds to the body end bit profile.

9 . The bit assembly of claim 1 , wherein the shank extend along a bit axis, wherein the shoulder includes a shoulder edge and a first inclined surface extending along the shoulder edge around the perimeter of the shoulder, the first inclined surface forming a first acute angle relative to the bit axis,

wherein the first end surface of the flange includes a flange edge and a second inclined surface extending along the flange edge around the perimeter of the first end surface, the second inclined surface forming a second acute angle relative to the bit axis, wherein the first inclined surface and the second inclined surface are positioned adjacent one another such that the first acute angle and the second acute angle form a combined wedge angle.

10 . The bit assembly of claim 1 , wherein the shank extends along a bit axis, wherein the shoulder includes an edge defining a perimeter, a first surface, and a second surface, the first surface positioned adjacent the edge and radially between the edge and the bit axis, the second surface positioned adjacent the first surface and radially between the first surface and the bit axis, the first surface and the second surface extending along the length of the perimeter,

wherein the first surface is inclined at a first angle relative to the bit axis and the second surface is inclined at a second angle relative to the bit axis.

11 . A cutter head for an industrial machine, the cutter head comprising

a drum supported for rotation about a drum axis; and

a plurality of bit assemblies, each bit assembly supported on the drum and including,

a sleeve including shank portion, a flange positioned adjacent an end of the shank portion, and a bore extending through the flange and the shank portion, the flange including a first end surface, a second end surface, and a sleeve outer surface extending between the first end surface and the second end surface, a portion of the sleeve outer surface positioned adjacent the first end surface defining a sleeve profile; and

a bit including a cutting end, a shank, and a shoulder positioned between the cutting end and the shank, at least a portion of the shank positioned within the bore of the sleeve, the shoulder positioned adjacent the first end surface of the sleeve, the bit further including a bit outer surface extending between the cutting end and the shoulder, a portion of the bit outer surface positioned adjacent the shoulder defining a bit profile that corresponds to the sleeve profile.

12 . The cutter head of claim 11 , wherein the bit profile defines a first frustoconical shape and the sleeve profile defines a second frustoconical shape, the first frustoconical shape and the second frustoconical shape having an identical, constant slope.

13 . The cutter head of claim 11 , wherein the entire length of the sleeve outer surface defines the sleeve profile, and wherein the entire length of the bit outer surface defines the bit profile.

14 . The cutter head of claim 11 , wherein an end surface of the bit shoulder is spaced apart from the first end surface of the sleeve by a gap.

15 . The cutter head of claim 11 , wherein the sleeve profile is a first end sleeve profile, a portion of the sleeve outer surface positioned adjacent the second end surface defining a second end sleeve profile, each bit assembly further including,

a holder including a holder end surface, an opening positioned on the holder end surface, and a holder outer surface, the opening receiving the shank portion of the sleeve, the holder end surface positioned adjacent the second end surface of the flange, a portion of the holder outer surface positioned adjacent the holder end surface defining a holder profile, the holder profile corresponding to the second end sleeve profile.

16 . The cutter head of claim 11 , wherein the bit includes a bit body and an insert, the bit body extending between a body end and the shoulder, the bit including an aperture positioned adjacent the body end, the insert positioned at least partially within the aperture and including a tip,

wherein the bit profile is a shoulder end bit profile, a portion of the bit outer surface positioned adjacent the body end defining a body end bit profile,

wherein the insert includes an insert outer surface, at least a portion of the insert outer surface defining an insert profile that corresponds to the body end bit profile.

17 . A bit assembly configured to be secured to a cutting drum, the bit assembly comprising:

a bit including a cutting end, a shank, and a shoulder positioned between the cutting end and the shank, the bit further including a bit outer surface extending between the cutting end and the shoulder, a portion of the bit outer surface positioned adjacent the shoulder defining a bit profile; and

a holder including a holder end surface, an opening positioned on the holder end surface, and a holder outer surface, the opening receiving at least a portion of the shank, the holder end surface facing toward the shoulder, at least a portion of the holder outer surface positioned adjacent the holder end surface defining a holder profile that corresponds to the bit profile.

18 . The bit assembly of claim 17 , further comprising a sleeve including shank portion, a flange positioned adjacent an end of the shank portion, and a bore extending through the flange and the shank portion, the bore receiving the shank of the bit, the shank portion positioned within the opening of the holder, the flange positioned between the shoulder of the bit and the holder end surface of the holder, the flange including a flange outer surface, at least a portion of the flange outer surface defining a sleeve profile that corresponds to the holder profile.

19 . The bit assembly of claim 18 , wherein the shank portion of the sleeve extends along an axis, the flange including a first end surface adjacent the holder end surface and a second end surface adjacent the shoulder of the bit, the first end surface of the flange including an edge and a first inclined surface extending along the edge around the perimeter of the first end surface, the first inclined surface forming a first acute angle relative to the axis,

wherein the holder end surface includes a holder edge and a second inclined surface extending along the holder edge around the perimeter of the holder end surface, the second inclined surface forming a second acute angle relative to the axis, wherein the first inclined surface and the second inclined surface are positioned adjacent one another such that the first acute angle and the second acute angle form a combined wedge angle.

20 . The bit assembly of claim 17 , wherein the bit includes a bit body and an insert, the bit body including an aperture positioned adjacent the first end of the bit, the insert positioned at least partially within the aperture, the insert defining a tip, the insert including an insert outer surface defining an insert profile that is continuous with the bit profile.

21 . The bit assembly of claim 17 , wherein an imaginary surface aligned with a contour of the holder profile and extending beyond the holder end surface is aligned with a contour of the bit profile.