Actuation means for roller guide bushing for drill rig

Details Actuation means for roller guide bushing for drill rig Actuation means for roller guide bushing for drill rig

1976-05-03

1977-10-18

Bertsch, Richard A.

Cutlery

F16C 3304, F16C 128

Patent

active

040543323

ABSTRACT:
A drill pipe bushing for stabilizing a drill pipe at the mouth of the well during drilling which includes a frame surrounding the drill pipe axis and a plurality of support arms supported from the frame in a circular array about the drill pipe. The support arms are pivotable about an axis substantially parallel to the axis of the drill pipe. Rollers are attached to each support arm with the axis of the rollers normally parallel to the axis of the drill pipe. A rotatable member encircles the drill pipe axis and a plurality of toggle arms are secured between the rotatable member and the end of a corresponding support arm remote from the connection of the support arm to the frame. Structure is provided for rotating the rotatable member relative to the frame thereby moving the toggle arms and the support arms to move the rollers into engagement with or away from the drill pipe. The rotational axis of the rollers become canted upon both rotation and translation of the drill pipe.

REFERENCES:
patent: 3194611 (1963-07-01), Mahony
patent: 3367690 (1968-02-01), Federspill

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