Gearbox for a rotary, mineral cutting head
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United States of America Patent
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Jul 11, 1989
Issued Date -
N/A
app pub date -
Sep 3, 1987
filing date -
Nov 19, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A gearbox for a rotary, mineral cutting head, comprises a casing housing speed reduction gearing and also a portion of a drive shaft supported by first and second, spaced-apart bearings, with at least one radially extending cylinder having a closed inner end and an open, outer end provided in said drive shaft and a reciprocable piston partially housed in said cylinder with a fluid seal between said piston and said cylinder; a variable volume, pressure-generating chamber defined between a radially inner end of said piston and a closed, inner end of its cylinder; a ring surrounding said drive shaft and having an inner profile and with a radially outer end of said piston in contact with said inner profile and with said piston.
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