Drill string shock absorber

Details Drill string shock absorber Drill string shock absorber

1974-12-23

1976-03-30

Marbert, James B.

Spring devices

Resilient shock or vibration absorber

Tool movement dampening

267125, 64 23, F16F 700

Patent

active

039470083

ABSTRACT:
In accordance with illustrative embodiments of the present invention disclosed herein, a shock absorber adapted to be incorporated in a drill string includes axially splined housing and mandrel members that enclose a resilient structure which absorbs longitudinal vibrations and shock loads and otherwise attenuates exciting forces generated by the drill bit. The resilient structure comprises inner and outer cylindrical torsion tube springs providing a low spring rate.

REFERENCES:
patent: 3350900 (1967-11-01), Harrison
patent: 3447340 (1969-06-01), Garnett
patent: 3673813 (1972-07-01), Wright

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