Stepped drill construction

Patent · Tue Apr 15 04:00:00 EST 1986

OSTI ID:5719309

Korb, W B; Wallace, F R

A drill bit of stepped construction is described having a shank at one end and a series of generally cylindrical outer surfaces of incrementally decreasing diameter from the shank end to the outer end thereof, the drill bit comprising a beveled conical surface interconnecting each adjacent pair of cylindrical surfaces, at least two flutes machined into opposite sides of the drill bit to provide at least two cutting edges for each diameter defined by the intersection of one surface of each of the flutes, each of the cylindrical surfaces and each of the conical surfaces, a raised portion on each of the conical cutting edge surface, the raised portion having a tapered back relief over an acute angle which is substantially less than the peripheral extent of the conical surfaces.

• Assignee: American Saw and Mfg. Co., East Longmeadow, MA
• Patent Number(s): US 4582458
• OSTI ID: 5719309
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
DESIGN
DRILL BITS
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FABRICATION
INCIDENCE ANGLE
NATURAL GAS WELLS
OIL WELLS
SURFACES
WELL DRILLING
WELLS