Releasing overshot apparatus

Details Releasing overshot apparatus Releasing overshot apparatus

E - Fixed Constructions

21

B

166/59

E21B 31/12 (2006.01)

Patent

CA 1186215

ABSTRACT OF THE DISCLOSURE In accordance with an illustrative embodiment of the present invention, a releasing and retrieving apparatus for a pack-off tool used in pipe testing operations includes a tubular body having slots in the walls thereof, each slot having an inclined surface at its lower end, elongated gripping members carried in each slot and being movable longitudinally and laterally with respect thereto, a first coil spring urging said gripping members downwardly to cause the lower end portions thereof to be moved inwardly by said inclined surfaces to gripping position, and a second coil spring urging the central regions of said gripping members outwardly so that inward pressure on the respective upper end portions thereof can be employed to pivot the gripping members about said central regions and cause outward movement of said lower end portions to a released position.

412832

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