Boring or penetrating the earth – With above-ground means to feed tool
Patent
1991-11-08
1993-06-01
Britts, Ramon S.
Boring or penetrating the earth
With above-ground means to feed tool
173149, E21B 302
Patent
active
052151530
ABSTRACT:
Apparatus for driving earth entering elements such as drills and casings which can be threaded together to form strings has a column to be erected in a wanted position. The column is provided with a unit moveable lengthwise thereof between upper and lower limits. The elements have two vertically spaced pairs of transversely aligned lugs with the lugs of the two pairs vertically aligned. The unit is provided with clamping jaws which positively grip the driving end of an element and prevent its turning relative to the jaws only if the element is in the driving axis of the unit in a predetermined position such that its lugs can be caught when the jaws are closed. A loader carries a plurality of elements which are held in sockets parallel to the driving axis and is moveable between an inoperative position and a position in which a selected element is positioned in the axis and which will then have its lugs appropriately positioned for locking engagement by the jaws. A holder is also disclosed for gripping the driving end of a driven element. The apparatus can be operated to withdraw an element and transfer it to the loader with its lugs correctly positioned.
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Britts Ramon S.
Tsay Frank S.
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