Means to prevent relative rotation of threaded together pin and

Details Means to prevent relative rotation of threaded together pin and Means to prevent relative rotation of threaded together pin and

1977-07-05

1978-08-22

Schroeder, Werner H.

Pipe joints or couplings

With means blocking release of holding means

Auxiliary latch

285333, 285421, 403320, 403341, F16L 5500

Patent

active

041084780

ABSTRACT:
In a rotary drilling system for drilling deep, large-diameter bore holes in the earth, using multiple lengths of drill pipe joined together by threaded tool joints, the improvement in means to prevent relative rotation while joining and unjoining the two parts of the threaded-together tool joints, after the tool joints has been made to a desired torque, comprises a retaining cylinder or ring, of somewhat larger diameter than the diameter of the tool joints, positioned to surround a tool joint with an annular space of a selected radial dimension. There is at least one pair of longitudinally slidable cams or wedges that slide within longitudinal grooves on the inside surface of the retainer ring. Hydraulic means are provided to move the pair of wedges longitudinally toward each other, along the sloping grooves until they are wedged between the retaining ring and the outer surface of the tool joint, one wedge opposite each part of the tool joint. Sufficient force is applied to the ends of the wedges to generate sufficient pressure between the inner surfaces of the wedges, and the outer surfaces of the tool joints parts, so that once the wedges are set, a much greater torque is required to turn the tool joint parts with respect to each other.

REFERENCES:
patent: 17236 (1857-05-01), Sellers
patent: 320439 (1885-06-01), Mackintosh
patent: 503033 (1893-08-01), Boorman
patent: 1872105 (1932-08-01), Black
patent: 2017994 (1935-10-01), Spang
patent: 3096075 (1963-07-01), Brown
patent: 3866954 (1975-02-01), Slator et al

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