Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1988-11-21
1989-11-14
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
384 96, E21B 1022
Patent
active
048800686
ABSTRACT:
The present invention is a rotary drill bit locking mechanism comprising a support spindle and a cutter cone with bearing surfaces. Furthermore, first and second annular grooves are formed on the bearing surfaces of the support spindle and the cutter cone that are radially adjacent to each other when the cutter cone is secured onto the support spindle. Additionally, a holding ring having a plurality of segments is assembled into the first and second annular grooves to secure the cutter cone into a rotatable position on the support spindle. Further, there is means for biasing the segments of the holding ring into a ring-like configuration in the annular grooves. This invention thus provides a rotary drill bit locking mechanism for holding a cutter cone onto the support spindle that is easy to manufacture and assemble.
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Meier Harold E.
Neuder William P.
Varel Manufacturing Company
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