Journal bushing drill bit construction

Patent · Tue Feb 25 04:00:00 EST 1986

OSTI ID:5785128

Dorosz, D D.E.

A rotary earth boring bit is described consisting of; (a) a body structure adapted for threaded connection to a string of drill stem, the body structure defining cutter support legs, each forming planar surface means; (b) journal means extending transversely from each of the cutter support legs and oriented in normal relation with the planar surface means, the journal means defining bushing retainer means and reduced diameter bearing surface means of smaller dimension than the bushing retainer means; (c) rotary cone cutter means defining external cutter teeth and forming an internal journal and bushing receptacle, the rotary cutter means forming planar cutter surface means; (d) segmented bushing means positioned about the bearing surface means and received in mechanically seized relation within the journal and bushing receptacle, end portions of the segmented bushing means extending beyond the planar cutter surface means for engagement with the planar surface means of the cutter support legs and maintaining the planar cutter surface means in spaced relation with the planar surface means of the cutter support legs, the segmented bushing means and the rotary cone cutter means cooperatively forming a circular seal recess intersecting the planar cutter surface means; (e) locking means positioned about the segmented bushing means within the journal and bushing receptacle and securing the rotary cutter means in locked assembly with the segmented bushing means, whereby the rotary cutter means and the segmented bushing means are rotatably mounted on the journal means; and (f) circular seal means disposed within the circular seal recess and positioned about the segmented bushing means and establishing a seal with the planar surface means of the cutter support legs and with the segmented bushing means.

• Assignee: NOV; EDB-86-092977
• Patent Number(s): US 4572306
• OSTI ID: 5785128
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BUSHINGS
CONSTRUCTION
DESIGN
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
JOINTS
MOTION
NATURAL GAS WELLS
OIL WELLS
PIPES
POSITIONING
ROTARY DRILLING
ROTARY DRILLS
ROTATION
SEALS
THREADED JOINTS
WELL DRILLING
WELLS