Drill rod retrieving tool
Patent
·
OSTI ID:6049289
A tool for retrieving tubular drill rods or the like from a drill hole includes an elongated cylindrical member which is dimensioned to be insertable into the broken or disconnected drill rod to be retrieved. The elongated member includes a frictional coupling made up of a number of elastically deformable gripping rings which are retained in sleeved relationship on the elongated member. The retrieving tool also includes a drill rod engaging member having a skirt defining a conical surface which surrounds and wedgingly engages the broken end of the drill rod. The drill rod engaging member is threadedly connected to the elongated cylindrical member. In response to rotation of the retrieving tool, the 2 members move axially with respect to each other to compress the stack of deformable rings into frictional engagement with the broken drill rod whereby the broken drill rod may be retrieved from the drill hole. (9 claims)
- Assignee:
- Gardner Denver Co.
- Patent Number(s):
- US 3697113
- OSTI ID:
- 6049289
- Country of Publication:
- United States
- Language:
- English
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