Glass drill bit

Details Glass drill bit Glass drill bit

2007-04-17

2007-04-17

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Processes

Bit detachable

C408S145000, C408S224000, C451S541000, C451S041000

Reexamination Certificate

active

10981037

ABSTRACT:
A method and apparatus for drilling glass using a drill and drill bit. The method utilizes a drill bit having a plurality of shaft diameters, and being provided with a plurality of types of abrasives. By providing a coarser abrasive on a narrow portion of the bit, and finer abrasives on a wider portion of the bit, drilling can be accomplished while reducing the incidents of micro fracture in the glass being drilled. Providing an even narrower connection shaft between the two cutting portions of the drill bit further facilitates reduction in micro fractures created during the drilling process.

REFERENCES:
patent: 2978846 (1961-04-01), Barron
patent: 3688386 (1972-09-01), Pereira
patent: 4483108 (1984-11-01), Howard
patent: 4800686 (1989-01-01), Hirabayashi et al.
patent: 5354155 (1994-10-01), Adams
patent: 5944263 (1999-08-01), Lucco et al.
patent: 6196908 (2001-03-01), Adams
patent: 6511267 (2003-01-01), Slaughter
patent: 64-078710 (1989-03-01), None

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