Rock bit construction

Patent · Tue Oct 23 04:00:00 EDT 1984

OSTI ID:6143135

Dorosz, D D. E.

A rotary earth boring drill is provided having a body structure with a plurality of depending cutter supporting legs having integral spindles extending transversely therefrom. Rotary cutter cone elements are supported by split bushings, roller bearings or a combination of the same, on appropriate bearing surfaces defined by the integral spindles. The bushings and cutter cones define mating tapered surfaces having an interference fit that secures the bushings and cutter cone in nonrotatable assembly. Circular locking elements are provided in locking grooves that are defined cooperatively by the bushings and cutter cones. End portions of the bushings extend axially beyond a planar surface defining one extremity of the cutter cone and establishes rotatable sealing engagement with an opposed planar surface defined by the depending leg structure of the bit. This rotatable seal prevents drill cuttings, dust and other debris from entering the bearing support of the cutter cone. A circular resilient seal may also be supported by the cutter cone and may also have rotatable sealing engagement with the planar surface of the depending leg, thus providing additional sealing and protection of the bushings and bearings.

• Assignee: Trend Rock Bit Alberta Ltd. (Canada)
• Patent Number(s): US 4478299
• OSTI ID: 6143135
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BEARINGS
BUSHINGS
DEPTH
DIMENSIONS
DRILL BITS
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
MECHANICAL STRUCTURES
NATURAL GAS WELLS
OIL WELLS
ROCK DRILLING
ROLLER BEARINGS
ROTARY DRILLING
ROTARY DRILLS
SUPPORTS
WELL DRILLING
WELLS