Downhole drilling tool
OwnerGeorge Swietlik, Christopher David Downinventors
Life of this patent
Estimating the term…
Abstract
A downhole drilling tool 136 comprises a drillstring 138, a drilling head 140, and a freewheel 144 for transferring drive from the drillstring to the drilling head. The freewheel 144 is positioned between the drillstring 138 and the drilling head 140.
Claims22
A downhole drilling tool comprising and a drilling head, wherein a freewheel for transferring drive from the drillstring to the drilling head is positioned between the drillstring and the drilling head, wherein the freewheel, comprises:
- a shaft mounted for rotation within a housing, a cylinder mounted about the shaft disposed between the shaft and the housing, the cylinder having radially disposed drive faces, a drive element provided on the shaft and a drive element provided on the housing, in use, the cylinder moving between a locked position in which the drive faces of the cylinder engage the drive elements of the shaft and housing respectively and a release position in which the cylinder rotates freely between the drive elements.
A downhole drilling tool comprising a drillstring and a drilling head, wherein a freewheel for transferring drive from the drillstring to the drilling head is positioned between the drillstring and the drilling head, the freewheel comprising:
- a first race;
- a second race;
- a locking ring interposed between the first race and the second race, and at least one locking element retained partly in a recess of the first race and partly in a recess of the locking ring, in use, the locking element moving between a locked position in which the locking ring is forced into engagement with the second race and a release position in which the locking ring is released from the second race.
A downhole drilling tool comprising a drillstring and a drilling head, wherein a freewheel for transferring drive from the drillstring to the drilling head is positioned between the drillstring and the drilling head, the freewheel, comprising:
- a first race;
- a second race:
- a guide ring interposed between the first race and the second race, and at least one locking element retained partly in a recess of the first race and partly in a recess of the guide ring, in use, the locking element moving between a locked position in which the locking element is forced into engagement with the second race and a release position in which the locking element is released from the second race.
A downhole drilling tool comprising a drillstring and a drilling head, wherein a freewheel for transferring drive from the drillstring to the drilling head is positioned between the drillstring and the drilling head, wherein the freewheel comprises:
- a first race having a resilient latching member;
- and
- a second race having at least one recess therein;
- the resilient latching member of the first race being adapted to engage the at least one recess of the second race for transferring drive from one of the races to the other.
Dependencies are inferred from the claim text.