Rotary cutter assembly

Patent · Tue Dec 23 04:00:00 EST 1986

OSTI ID:7149971

Goodfellow, R D

This patent describes a rotary cutter assembly comprising: a drill head adapted at an upper portion thereof for coupling to a drill string for rotation about a central axis. At a lower portion thereof, it has angularly spaced receptacles defined between a pair of opposing containment walls and adapted for receiving a shank of a drill bit unit; each containment wall being traversed by an axial groove extending substantially parallel to the central rotational axis and a transverse groove extending substantially orthogonally to the central rotational axis; at least one bit unit comprising a shank receivable in a the receptacle and having axial and transverse grooves complementary with the longitudinal and transverse grooves of the drill head and cooperatively alignable therewith upon reception of the shank in a the receptacle; first lock pin means receivable in the complementary axial grooves of the drill head and the shank to releasably secure the shank transversely relative to the drill head and second lock pin means receivable in the complementary transverse grooves of the drill head and the shank to releasably secure the shank axially relative to the drill head.

• Assignee: NOV; EDB-87-029133; NOV-87-040731
• Patent Number(s): US 4630693
• OSTI ID: 7149971
• 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)
ALIGNMENT
DESIGN
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
INCIDENCE ANGLE
MOTION
NATURAL GAS WELLS
OIL WELLS
OPERATION
PIPES
ROTARY DRILLS
ROTATION
SPACE DEPENDENCE
WELL DRILLING
WELLS