Rotary cutting tool
AssigneeSpeare Tools, Inc.
InventorWilliam J. Speare
Life of this patent
Estimating the term…
Abstract
A cutting tool assembly which is adapted for use in combination with a drill for cutting a hole in a work piece. The assembly includes a u-shaped blade and a mandrel assembly for fixing the blade to the drill, a dust shield which surrounds the blade and a stabilizer which can be fixed adjacent the blade. In one construction, the blade includes tips which are removably connectable to a wing portion. Also, a coating of wear-resistant material may be applied to the tips so that the blade is self-sharpening during cutting operations.
Claims32
A cutting tool assembly adapted for use with a drill for cutting a hole in a work piece, the assembly comprising:
- a u-shaped blade including a wing portion having therein a centrally located slot;
- a dust shield surrounding the blade;
- a stabilizer including a central portion having therein a slot which aligns with the slot in the blade;
- and
- a mandrel assembly supporting the blade and adapted to be fixed to the drill, the mandrel assembly including a blade mount to which the blade and stabilizer are fixed, the blade mount being received in the slot in the wing portion, the blade mount including a radially extending disk which engages the blade and the stabilizer, a generally cylindrical portion, and a pair of opposite facing flats, the mandrel assembly also including a threaded portion which extends between the blade mount and a shank end.
A cutting tool assembly adapted for use with a drill for cutting a hole in a work piece, the assembly comprising:
- a u-shaped blade;
- a mandrel assembly supporting the blade and adapted to be fixed to the drill;
- and
- a stabilizer including a central portion having opposite ends, the central portion having therein a slot which receives the mandrel assembly and having curved end portions, each extending from a respective end of the central portion of the stabilizer, and a detent in the end of each of the curved end portions.
A cutting blade assembly for use with a cutting tool assembly, the cutting assembly adapted for use with a drill for cutting a hole in a work piece, the cutting blade assembly comprising:
- a wing portion having opposite ends;
- a pair of tips selectively connectable to the opposite ends of the wing portion, respectively, each of the tips having a leading edge providing a sharp surface for engaging the work piece;
- and
- a connecting assembly for selectively connecting the tips to the wing portion.
A cutting blade assembly for use with a cutting tool assembly, the cutting tool assembly being adapted for use with a drill for cutting a hole in a work piece, the cutting blade assembly comprising:
- a wing portion having opposite ends;
- and
- a pair of tips connected to respective opposite ends of the wing portion, each tip having an inner surface and an outer surface which intersect to define a leading edge, the leading edge providing a sharp surface for engaging the work piece, the inner surface being formed of a material and the outer surface being formed of a material, the material of the inner surface wearing at a different rate than the material of the outer surface to sharpen the sharp surface.
A method of forming a cutting blade for use with a cutting tool assembly, the cutting tool assembly being adapted for use with a drill for cutting a hole in a work piece, the method comprising:
- forming a cutting blade assembly including a wing portion having opposite ends, and a pair of tips connected to respective opposite ends of the wing portion, each tip having an inner surface and an outer surface which intersect to define a leading edge, the leading edge providing a sharp surface for engaging the work piece, the inner surface being formed of a material and the outer surface being formed of a material, the material of the inner surface wearing at a different rate than the material of the outer surface to sharpen the sharp surface;
- and
- applying a coating to one of the inner surface and the outer surface of the tip so that the inner surface wears at a different rate than the outer surface to sharpen the leading edge.
Dependencies are inferred from the claim text.