Hydraulic jar

Details Hydraulic jar Hydraulic jar

1975-10-06

1977-02-15

Leppink, James A.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

E21B 110

Patent

active

040077985

ABSTRACT:
Hydraulic jar comprising a housing, a piston axially movable within the housing, an anvil disposed within the housing, a hammer associated with the housing and means for maintaining the housing in a position with the hammer spaced from the anvil and then releasing the housing when the piston moves to a select, extended position.

REFERENCES:
patent: 2309872 (1943-02-01), Shaffer et al.
patent: 2621024 (1952-12-01), Koppl et al.
patent: 2740479 (1956-04-01), Schwegman
patent: 2828822 (1958-04-01), Greer
patent: 2851110 (1958-09-01), Greer
patent: 3251426 (1966-05-01), Lebourg

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