Drill string shock absorber with improved pin type torque transm

Details Drill string shock absorber with improved pin type torque transm Drill string shock absorber with improved pin type torque transm

1979-01-29

1980-07-01

Reger, Duane A.

Spring devices

Fluid

Expansible-contractible chamber device

175306, E21B 1702

Patent

active

042103169

ABSTRACT:
A shock absorbing apparatus for use in an earth boring drill string is disclosed herein. The shock absorber is of the type having a mandrel reciprocally mounted for rotation with a tubular body; a sealed chamber between the tubular body and the mandrel containing pressurized fluid for absorbing load and shock. Torque is transmitted between the mandrel and body by pins which are inserted in cavities formed by grooves on the exterior of the mandrel and the interior of the body. Means are provided to prevent pin rotation and to prevent the pins from contacting the groove edges to provide improved loading and wearing characteristics of the pins.

REFERENCES:
patent: 3834472 (1974-09-01), Perkins
patent: 4145034 (1979-03-01), Dyer

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