Miner cutting bit holding apparatus

Apparatus for supporting a cutting bit on a moveable cutting head at a predetermined cutting angle, said cutting bit having an extended shank and a central axis passing through said shank, comprising:

• a. a bit holder having an upper body portion and a lower shank portion where said body portion includes an aperture for receiving said shank of said cutting bit for supporting said cutting bit at said predetermined cutting angle and rear upper lateral extended members each having a first abutment surface, said first abutment surfaces being coplanar and disposed substantially perpendicular to and on opposite lateral sides of the axis of said cutting bit, and said shank portion includes a rear lower second abutment surface disposed substantially parallel to the axis of said cutting bit;
• b. a mounting base which may be attached to said cutting head, said mounting base having a cavity therein for receiving the shank portion of said bit holder, said mounting base having a rear member having an upstanding yoke having upper forward abutment surfaces which are substantially perpendicular to and on opposite lateral sides of said axis of said cutting bit and which are engaged by the corresponding said first abutment surfaces and a lower forward abutment surface which is substantially parallel to said axis of said cutting bit and which is engaged by said second abutment surface;
• and
• c. means for urging said first abutment surfaces of said bit holder into engagement with said upper abutment surfaces of said mounting base and said second abutment surface of said bit holder into engagement with said lower abutment surface of said mounting base.

Apparatus for supporting a cutting bit on a moveable cutting head at a predetermined cutting angle, said cutting bit having an extended shank, an enlarged cutting head, a shoulder between said shank and said cutting head, and a central axis passing through said shank, comprising:

• a. a bit holder having an upper body portion and a lower shank portion where said body portion includes an aperture for receiving said shank of said cutting bit for supporting said cutting bit at said predetermined cutting angle and a bearing surface adjacent said aperture which abuts said shoulder of said cutting bit, and rear upper lateral extended members each having a first abutment surface, said first abutment surfaces being coplanar and disposed substantially perpendicular to and on opposite lateral sides of the axis of said cutting bit, and said shank portion includes a rear lower second abutment surface disposed substantially parallel to the axis of said cutting bit;
• b. a generally rectangular mounting base, in plan view, which may be attached to said cutting head, said mounting base having a cavity therein for receiving the shank portion of said bit holder, said mounting base having a rear member having an upstanding yoke having upper forward abutment surfaces which are substantially perpendicular to and on opposite lateral sides of said axis of said cutting bit and which are engaged by the corresponding said first abutment surfaces and a lower forward abutment surface which is substantially parallel to said axis of said cutting bit and which is engaged by said second abutment surface;
• and
• c. means for urging said first abutment surfaces of said bit holder into engagement with said upper abutment surfaces of said mounting base and said second abutment surface of said bit holder into engagement with said lower abutment surface of said mounting base.