Axial retainer for a cutter in a rotary drill bit
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United States of America Patent
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Feb 13, 1990
Grant Date -
N/A
app pub date -
Feb 25, 1988
filing date -
Nov 17, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A retainer for axially retaining a cutter on the journal pin of a rotary drill bit body includes a plurality of arcuate sliding keys and a single initial tensioning ring accommodated astride an annular groove formed in the peripheral outer wall surface of the journal pin and a corresponding annular groove formed in the inner peripheral wall surface of the cutter. When the cutter is mounted on the journal pin, the initial tensioning ring functions to urge the sliding keys into pressured contact with the cutter groove when the two grooves are in registration. Not only is assembly facilitated, but damage to the sliding keys that might otherwise be caused by any excessive axially directed force applied to the sliding keys during operation of the drill bit is prevented by allowing the sliding keys to recede within the annular groove of the journal pin.
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