Forstner drill bit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 19, 2010
Grant Date -
Jul 26, 2007
app pub date -
Jan 23, 2007
filing date -
Jan 26, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A drill bit has a cylindrical drill head (1) having two essentially diametrically situated primary cutting edges (2) and chip channels (3) associated therewith. The outer surface (5) of the drill head is formed by curved sections (6) whose end faces (4) have teeth (8) which extend in the axial direction (A) and have cutting edges (7) and cutting faces (9). The cutting faces (9) run at an acute angle in the cutting direction (S) and are set back with respect to a radial line (L) passing through the cutting edge (7). The teeth are formed by crenellated elements (8) which with one of their respective side walls form a cutting face (9) of the cutting edges (7). The side walls (10) of the adjoining crenellated element (8) opposite from the cutting face (9) runs parallel to the cutting face (9).
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