Rotatable drill string having a torsionally elastic shaft drivin

Details Rotatable drill string having a torsionally elastic shaft drivin Rotatable drill string having a torsionally elastic shaft drivin

1974-06-12

1976-02-24

Scott, Samuel

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

64 23, 175320, F16D 314

Patent

active

039396703

ABSTRACT:
A rotatable drill string of a rock drill in which a torsionally elastic shaft provides a rotary driving connection between the drill string and the rock bit for absorbing the usual excessive torque developing in the string during a drilling operation. A lost motion clutch member becomes effective following a predetermined extreme degree of flexing of the torsion shaft to relieve the latter of further added torque load.

REFERENCES:
patent: 2953351 (1960-09-01), Bodine et al.
patent: 3033011 (1962-05-01), Garrett
patent: 3129571 (1964-04-01), Reynolds
patent: 3141313 (1964-03-01), Brickett et al.
patent: 3660990 (1972-05-01), Zerb
patent: 3750423 (1973-08-01), Williams

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