Drill with trimming attachment

A drill with a trimming attachment for forming a hole in a work piece, which comprises:

• a drill shaft having a plurality of helical flutes and a plurality of longitudinally extending grooves defined at axially and circumferentially staggered positions about the periphery of the shaft;
• and
• a trimming attachment suitable for clamping to the drill shaft for forming a beveled recess at the top of a hole formed by the drill, the trimming attachment including,
• a) a body arranged to be removably journaled about and clamped to the shaft of the drill, the body including a plurality of separate blocks and a plurality of bolts for coupling the blocks together;
• and
• b) a trimming blade having base and arm portions, the base portion of the trimming blade having a through hole defined therein and being detachably secured to the body at a position between two of the blocks, by one of said bolts which passes through the through hole;
• and
• wherein an edge of the arm portion of the trimming blade is closely received by a selected one of said grooves such that during use, the groove carries at least a portion of the load acting against the trimming blade.

A drill with a trimming attachment for forming a hole in a work piece, which comprises:

• a drill shaft;
• a longitudinally extending groove formed in the shaft of the drill;
• and
• a trimming attachment suitable for clamping to the drill shaft for forming a beveled recess at the top of a hole formed by the drill, the trimming attachment including a body having a plurality of separate blocks and plurality of attachment means for combining the blocks together, and a trimming blade having base and arm portions, the base portion of the trimming blade being detachably secured to the body, and said body being arranged to be removably journaled about and clamped to the shaft of the drill such that an edge of the arm portion of the trimming blade is closely received by said groove such that during use, the groove carries at least a portion of the load acting against the trimming blade;
• wherein the trimming blade has a through hole defined at the base portion thereof and is fixed to the body at a position between two of the blocks and is secured by said attachment means which passes through the through hole.

A drill with a trimming attachment for forming a hole in a work piece, which comprises:

• a drill shaft having a plurality of helical flutes and a plurality of longitudinally extending grooves defined at axially and circumferentially staggered positions about the periphery of the shaft;
• and
• a trimming attachment suitable for clamping to the drill shaft for forming a beveled recess at the top of a hole formed by the drill, the trimming attachment including:
• a) a body arranged to be removably journaled about and clamped to the shaft of the drill, the body including a plurality of separate blocks and attachment means for coupling the blocks together;
• and
• b) a trimming blade having base and arm portions, the base portion of the trimming blade having a through hole defined therein and being detachably secured to the body at a position between two of the blocks, by said attachment means which passes through the through hole;
• and
• wherein an edge of the arm portion of the trimming blade is closely received by a selected one of said grooves such that during use, the groove carries at least a portion of the load acting against the trimming blade.

A tool comprising:

• a trimming attachment suitable for clamping to a drill shaft for forming a beveled recess at the top of a hole formed by a drill, the trimming attachment including:
• a) a body arranged to be removably journaled about and clamped to the shaft of the drill, the body including a plurality of separate blocks and attachment means for coupling the blocks together;
• and
• b) a trimming blade having base and arm portions, the base portion of the trimming blade having a through hole defined therein and being detachably secured to the body at a position between two of the blocks, by said attachment means which passes through the through hole;
• and
• wherein an edge of the arm portion of the trimming blade is closely received by a longitudinally extending groove formed in the drill shaft such that during use, the groove carries at least a portion of the load acting against the trimming blade.