Apparatus for positioning deflection wedges
AssigneeBoart International Limited
InventorsWulf Eilers, Zdenek L. Figar, Johan G. Grabe, Stanley J. Landers, David S. Williams
Life of this patent
Estimating the term…
Abstract
A deflection wedge is positioned in a long horizontal drill hole by securing it with a shear pin to an extension on a drill string. The extension is turned independently of the drill string to enable a droparm mechanism to actuate a trigger which stops rotation at a predetermined orientation. Rotation is effected by means of a rifle bar mechanism. The rifle bar presses against the bottom of the hole to cause rotation and the trigger declutches the rifle nut when the droparm drops.
Claims2
Means for positioning a deflection wedge in a drill hole, which has a pronounced horizontal component of direction, comprising:
- an extension adapted to be secured at one end to the end of a drill string in such a manner that the extension is free to rotate relatively to the drill string;
- a deflection wedge detachably carried at the other end of the extension;
- means to cause the extension to rotate relatively to the drill string;
- and a wedge orientation mechanism including a droparm mechanism adapted to stop rotation of the extension upon a present orientation being achieved and a trigger actuated by the droparm mechanism to immobilize said rotation means, said rotation means including a rifle bar mechanism having a first element adapted to be anchored against the bottom of a drill hole by axial pressure on the drill string and a second element which is clutched to the extension so that the droparm mechanism actuates said trigger which declutches the second element from the extension.
Dependencies are inferred from the claim text.