Pressure compensator for rotary earth boring tool
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United States of America Patent
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-
Oct 4, 1983
Grant Date -
N/A
app pub date -
Aug 17, 1981
filing date -
May 29, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pressure compensator installed in the bit body of a rotary earth boring tool to lubricate the bearing surfaces of a rotary cutter and to effect a liquid seal. In order to reduce the number of component parts and to enhance durability, the pressure compensator includes a rubber diaphragm interposed between upper and lower capsule halves that form a spherical space.
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