Enclosed jar tool

Details Enclosed jar tool Enclosed jar tool

1985-09-09

1987-04-21

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

166178, 175299, E21B 414

Patent

active

046589171

ABSTRACT:
A jar tool having a mandrel and a housing substantially surrounding said housing. The mandrel and housing are splined such that they may move longitudinally relative to each other. First and second pairs of abutment faces for the jar and bump strokes respectively, are provided between the mandrel and the housing. Both sets of abutment faces are enclosed within the jar tool.

REFERENCES:
patent: 3208541 (1965-09-01), Lawrence
patent: 3949821 (1976-04-01), Raugust
patent: 4111271 (1978-09-01), Perkins
patent: 4361195 (1982-11-01), Evans

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