Drill bit for producing drilled holes with an undercut

Details Drill bit for producing drilled holes with an undercut Drill bit for producing drilled holes with an undercut

1989-06-22

1990-05-29

Howell, Daniel

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

Frictionally engaging sides of opening in work

408 83, B23B 4100

Patent

active

049291270

ABSTRACT:
A drill bit for producing drill holes with an undercut and comprising a drill bit shank, a drill bit tip mounted at an end of the drill bit shank and projecting laterally beyond the shank diameter, a rounded collar spaced from the drill bit tip and integrally formed on the drill bit shank, and a longitudinally displaceable sleeve mounted between the drill bit tip and the collar and having an internal diameter which is smaller than the diameter of the collar and the maximum width of the drill bit tip, and a method of manufacturing such a drill bit.

REFERENCES:
patent: 1847302 (1932-03-01), Emmons
patent: 3554192 (1971-01-01), Isberner
patent: 3893353 (1975-07-01), Lahmeyer
patent: 4010807 (1977-03-01), Fischer

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