Mechanical jarring devices for use in drilling

Details Mechanical jarring devices for use in drilling Mechanical jarring devices for use in drilling

1986-03-31

1987-09-22

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Resiliently biased

175300, 175304, E21B 406, E21B 31107

Patent

active

046949178

ABSTRACT:
A jarring device for use in drilling comprises first and second members longitudinally relatively movable between a locked position and a released position said device comprising control means including a pair of locking devices each arranged to prevent relative movement between said members until a predetermined force is applied to one of said movable members in either of two longitudinal directions. The control means includes two locking devices each of which locks in one of the two directions.
The locking devices may comprise pivotable bolts pivoted on a sliding member so that the free ends of the bolts contact an abutment on one of the movable members to effect locking, the bolts being retracted from engagement with the abutment by movement of the sliding member.

REFERENCES:
patent: 2144869 (1939-01-01), Boulter
patent: 2199969 (1940-05-01), Hamm
patent: 2309872 (1943-02-01), Shaffer et al.
patent: 2336564 (1943-12-01), Osmun
patent: 3658140 (1972-04-01), Berryman

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