Mechanical jarring devices for use in drilling

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

E - Fixed Constructions

21

B

255/29

E21B 4/06 (2006.01) E21B 31/107 (2006.01)

Patent

CA 1259603

ABSTRACT OF THE DISCLOSURE 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.

505618

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