Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1982-03-26
1984-10-23
Pate, III, William F.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175371, 76108A, 384 95, 384 96, E21B 1010, E21B 1022
Patent
active
044782993
ABSTRACT:
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.
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patent: 3480341 (1969-11-01), Hickernell
patent: 3656764 (1975-04-01), Robinson
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patent: 3923108 (1975-12-01), Williams, Jr.
patent: 4157122 (1979-06-01), Morris
patent: 4256193 (1981-03-01), Kunkel et al.
patent: 4304444 (1981-12-01), Persson
Dang Hoang C.
Pate III William F.
Trend Rock Bit Alberta, Ltd.
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