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05/15/08 - USPTO Class 175 |  26 views | #20080110679 | Prev - Next | About this Page  175 rss/xml feed  monitor keywords

Drill with a hard material drilling head

USPTO Application #: 20080110679
Title: Drill with a hard material drilling head
Abstract: A one-piece drilling head (4) which is to be secured, in a material-locking manner, at an end of a helical shaft of a drill, is formed of hard material and includes four radially extending, in a cross-shaped manner, legs (5) forming, respectively, two diametrically opposite main cutting edges (6) and two auxiliary cutting edges (7), with the main cutting edges (6) and the auxiliary cutting edges (7) extending proceeding from a drilling head drilling head tip (8), monotonously and strictly axially up to a radially outer edge, and with an envelope surface (9′) of the auxiliary cutting edges (7) lying completely within an envelope surface (9) of the main cutting edges (6) and contacts the same only at the drilling head tip (8).
(end of abstract)
Agent: Abelman, Frayne & Schwab - New York, NY, US
Inventor: Olaf Koch
USPTO Applicaton #: 20080110679 - Class: 175395 (USPTO)



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Previous Patent Application:
Expandable reamer apparatus for enlarging boreholes while drilling
Next Patent Application:
Drill bit nozzle assembly, insert assembly including same and method of manufacturing or retrofitting a steel body bit for use with the insert assembly
Industry Class:
Boring or penetrating the earth

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