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US 4,393,944 AGranted
Drill rig
AssigneeWarman International Limited
InventorsHans Gugger, John Ackland
Life of this patent
Estimating the term…
Abstract
The invention relates to a mobile drilling rig providing a rotation head which is small enough to fit between the mast members of the rig. Arrangements are made to pivot back the rotation head to give access to the drill line of the rig. The mast members can be pivotted on a frame to place them into the drilling and travelling position respectively.
Claims5
A mobile drill rig comprising:
- a mast having a pair of forward and rear mast members connected to each other;
- a base frame located at the lower extremities of said mast members;
- a rotation head comprising a variable speed axial piston motor;
- a main gear box connected to the output of said piston motor;
- a planetary drive adapted to be connected to the input of the main gear box, said rotation head being mounted directly between the mast members for axial movement along the mast members, with the drill line located between the pair of forward mast members;
- and
- a cradle located at the top of the mast such that the rotation head can move along said mast members into said cradle, said cradle being pivotally connected to said mast members so as to be pivotal about a horizontal axis so that with the rotation head within said cradle the cradle is adapted to be pivoted to move the rotation head further back between the mast members to move the rotation head clear of the drill line.
4 more elements
Dependencies are inferred from the claim text.