Releasing overshot apparatus

Details Releasing overshot apparatus Releasing overshot apparatus

1981-10-19

1984-03-13

Cherry, Johnny D.

Handling: hand and hoist-line implements

Grapple

Well type

294 8628, 294 8633, E21B 3112

Patent

active

044363346

ABSTRACT:
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 the gripping members downwardly to cause the lower end portions thereof to be moved inwardly by the inclined surfaces to gripping position, and a second coil spring urging the central regions of the gripping members outwardly so that inward pressure on the respective upper end portions thereof can be employed to pivot the gripping members about the central regions and cause outward movement of the lower end portions to a released position.

REFERENCES:
patent: 980920 (1911-01-01), Burnes
patent: 1801984 (1931-04-01), Schafer
patent: 3863974 (1975-02-01), Dinning
patent: 3950021 (1976-04-01), Goldschild et al.
patent: 4004835 (1977-01-01), Taylor

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