Two-piece drill bits
AssigneeMaxtech Manufacturing Inc.
InventorKailash C. Vasudeva
Life of this patent
Estimating the term…
Abstract
Two-piece drill bits and methods of manufacturing same provide a preferably hexagonal shank, and a drill portion having a proximal end inserted into an axial hole in a distal end of the shank. In a preferred embodiment, at least part of the area adjacent the proximal end of the drill portion is knurled. Alternative embodiments have wings, polygons, tapers or other irregular shapes, or combinations of same. A variety of means may be employed to mechanically capture the drill portion in the shank.
Claims14
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, said drill portion further comprising:
- two knurled portions separated by an unknurled portion at the proximal end of said drill portion.
A method of manufacturing a two-piece drill bit, said two-piece drill bit comprising a shank and a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, said method comprising the steps of:
- forming a knurled portion on at least a portion of said proximal end section of said drill portion;
- drilling an axial hole at a distal end of said shank;
- inserting said proximal end section of said drill portion into said axial hole;
- and,
- mechanically deforming at least a portion of said shank to symmetrically compress said shank onto said drill portion after said insertion of said proximal end section of said drill portion into said axial hole.
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, comprising:
- wings extending radially outwardly from said proximal end section of said drill portion.
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, characterized by said axial hole being tapered, and said drill portion having a correspondingly tapered proximal end, said drill portion comprising:
- a knurled portion at said tapered proximal end of said drill portion;
- and,
- an unknurled portion adjacent said tapered proximal end section of said drill portion.
Dependencies are inferred from the claim text.