Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1990-02-05
1991-08-13
Britts, Ramon S.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
175418, 175415, 175393, 173 78, 173 80, 173126, E21B 1707
Patent
active
050388746
ABSTRACT:
A drill string for top hammer drilling includes a drill bit, a set of central rod members for transferring impact energy to the drill bit, and a set of tubular members surrounding the rod members for transferring rotation to the drill bit. The rod members define a first internal channel for conducting flushing medium. The drill bit defines a second internal channel which extends rearwardly and penetrates a rear end of the drill bit to communicate with the first channel. The drill bit further includes a transverse channel disposed in an intermediate section of the drill bit and which is connected to the second channel. The transverse channel penetrates an envelope surface of the drill bit for conducting flushing medium out of the drill bit and into an enlarged space defined between the drill bit and the tubular member. Flushing medium discharged through the transverse channel supplies lubricant to a splined connection between the drill bit and the tubular member, and equalizes pressure between the second internal channel and the space between the drill bit and the tubular member.
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Larsson Lars K.
Liljebrand Sven P.
Britts Ramon S.
Sandvik AB
Schoeppel Roger J.
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