Handling: hand and hoist-line implements – Grapple – Well type
Patent
1972-11-09
1976-03-09
Reeves, Robert B.
Handling: hand and hoist-line implements
Grapple
Well type
294 863, 294 8632, E21b 3102
Patent
active
039428338
ABSTRACT:
A running tool for setting and retrieving well devices in and from wells having a mandrel reciprocable in its axial bore and slips suspended from the mandrel for reciprocation therewith into and out of supporting engagement with a well device, the bore including a counterbore in its lower portion permitting expansion of the slips into releasing position and a reduced lower extremity for contracting said slips into supporting position. A spring, confined in the counterbore around the mandrel, constantly urges said mandrel and slips downwardly and permits relative downward movement of the tool and expansion of the slips upon setting of the well device. A latch assembly is adapted to maintain the mandrel and slips in their relative upper positions upon slow lifting of the tool and is releasable upon rapid raising of said tool due to the inertia of said mandrel and slips combining with the compression of the spring to overcome the force of the latch assembly and permit upward movement of said tool relative to said mandrel and slips and reengagement of the slips with the well device. A safety lock may be provided to hold the latch assembly inoperative and prevent the inertia of the mandrel and slips from becoming effective.
REFERENCES:
patent: 1285523 (1918-11-01), Williams
patent: 1795322 (1931-03-01), Tripleit
patent: 2614881 (1952-10-01), Holland
patent: 2745693 (1956-05-01), McGill
patent: 2889170 (1959-06-01), Bode
patent: 3163228 (1964-12-01), Hayes
Marmor Charles A.
Nies John D.
Reeves Robert B.
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