Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1980-02-11
1981-08-18
Pate, III, William F.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
251333, E21B 31113
Patent
active
042841534
ABSTRACT:
The present invention accordingly relates to hydraulic jars which include elongated telescopically arranged mandrel and housing members relatively movable between contracted and extended positions such members respectively having a hammer and an anvil with the anvil being spaced from the hammer when the members are in the contracted position and arranged for contract when the members are in the extended position. The jar includes hydraulic means for retarding movement of the mandrel relative to the housing member for a given time during a jarring stroke when the jar is tensioned. The hydraulic means includes a fluid-filled chamber having adjoining first and second bores, the first bore being of lesser diameter than the second bore and a piston on the mandrel member being receivable in the first bore with the piston having a slightly smaller diameter than the first bore to restrict the flow of fluid past the piston as it moves relative to the first bore during the jarring stroke. When the piston exits from the first bore, the members move rapidly to the extended position so that the hammer delivers a blow to the anvil. The piston is of annular form and is positioned around the mandrel member for movement therealong between first and second axially spaced stops on the mandrel member. The piston has a first end adapted to co-operate with the first stop to permit free-flow of the fluid between the piston and mandrel member as the members move toward the contracted position. The piston also has a further portion adapted to co-operate with the second stop to provide sealing engagement therewith during movement of the piston through the first bore during the jarring stroke.
REFERENCES:
patent: 2902250 (1959-09-01), Bering
patent: 3088533 (1963-05-01), Sutlith
patent: 3150605 (1963-02-01), Howe
patent: 3804185 (1974-04-01), Mason
patent: 4181186 (1980-01-01), Blanton
OPI Ltd.
Pate III William F.
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