Rotary-percussion drill with a four-start helical shaft

Details Rotary-percussion drill with a four-start helical shaft Rotary-percussion drill with a four-start helical shaft

2007-04-27

2009-12-08

Bagnell, David J (Department: 3676)

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

C175S323000, C408S230000

Reexamination Certificate

active

07628232

ABSTRACT:
A rotary-percussion drill includes a four-start helical shaft (3) having a fourfold rotationally and mirror-symmetrical helix cross-section, with radially projecting convexly formed helical webs (4) extending from a concave groove bottom (5) up to the envelope circle (6) and having an undercut (7) with respect to a web width (S).

REFERENCES:
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patent: 4749051 (1988-06-01), Larsson
patent: 5553682 (1996-09-01), Batliner
patent: 6601659 (2003-08-01), Saitta et al.
patent: 7097396 (2006-08-01), Miyanaga
patent: 206517 (1909-05-01), None
patent: 9319009 (1994-03-01), None
patent: 4419641 (1995-12-01), None
patent: 9915304 (2000-09-01), None

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