Transmission sleeve
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United States of America Patent
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-
Nov 6, 2007
Grant Date -
Sep 15, 2005
app pub date -
Oct 30, 2002
filing date -
Nov 13, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention is a transmission sleeve for the reverse circulation down hole hammer activated by fluid under pressure, the hammer including an outer hammer casing, a drill bit retaining means (17) and a drill bit (10) retaining means (17) and extending forwardly therefrom. The transmission sleeve (25) comprises a transmission sleeve retaining means to retain the transmission sleeve (25) to the hammer, a flange (28) to direct exhaust fluid from the hammer extending from the transmission sleeve retaining means towards the cutting face (14) of the drill bit (10) so that the exhaust fluid is directed towards the cutting face (14) and a chamber (30) that extends circumferentially around the drill bit (10) into which the exhaust fluid flows prior to discharge from the end of the flange (28). The chamber (30) makes it possible for air pressure to be equalized around the periphery of the drill bit (10) and allows for some air flow from the end of the flange (28) between the channels (31) in the drill bit (10) to provide a curtain of air flow from the flange (28).
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