Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate
2007-11-06
2007-11-06
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
C175S393000, C175S417000
Reexamination Certificate
active
10495445
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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DeBarro Anthony Joseph Alexander
McInnes Malcolm Bicknell
Moir Fredric Graham
Terlet Christopher John
Bagnell David
Collins Giovanna M
SDS Digger Tools Pty Ltd
Thelen Reid Brown Raysman & Steiner
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