Collet-wear reducing drill bit

Details Collet-wear reducing drill bit Collet-wear reducing drill bit

1991-02-25

1992-04-07

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

408144, B23B 5102

Patent

active

051022710

ABSTRACT:
An improved drill bit having a generally cylindrically shaped shank has a reduced diameter rear shank portion forming a central coaxial stem with a rear transverse face comprisingn the butt end of the drill bit. An annular wear reduction ring made of softer material than the shank material and having an outer diameter approximately equal to the diameter of the shank forward of the reduced diameter portion of the shank fits over the stem. The softness of the wear reduction ring protects collets, into which the bit is inserted to and removed, from abrasive wear, thereby extending useful life of the collet.

REFERENCES:
patent: 4006996 (1977-02-01), Kasabian
patent: 4232985 (1980-11-01), Nielsen

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