Releasable overshot

Details Releasable overshot Releasable overshot

1976-12-06

1978-11-28

Marber, James B.

Handling: hand and hoist-line implements

Grapple

Well type

294 8618, E21B 3100

Patent

active

041272978

ABSTRACT:
A wireline operated overshot is disclosed. In the illustrated embodiment, the overshot includes a grapple which is located internally of a sleeve telescoped about it having a tapered internal shoulder. The grapple engages and disengages a fish. In the event the overshot becomes stuck on a fish, it can be released by downwardly jarring movement which shears a pin. The pin is located to permit a limited range of telescoping movement between the grapple and telescoped external sleeve. A spring is incorporated which forces the grapple downwardly against the tapered sleeve. The apparatus includes a latching mechanism which overcomes the spring to move the parts to a released position.

REFERENCES:
patent: 1661638 (1928-03-01), Spang
patent: 3152829 (1964-10-01), Steele, Sr.
patent: 3960399 (1976-06-01), Dufrene

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