Lifting head

Details Lifting head Lifting head

1986-02-04

1987-03-03

Cherry, Johnny D.

Handling: hand and hoist-line implements

Grapple

Fixed and moveable jaw

294 88, 294 90, 294902, E21B 1914

Patent

active

046470999

ABSTRACT:
A lifting head having a gate arm, and a latch arm, pivotally secured to a frame. A clamping block, also mounted on the frame, is movable between a retracted position away from the drill collar and an extended position against the drill collar. A plurality of gripping inserts are located on the clamping block and on the gate arm. Each insert has a body and a plurality of teeth. The bodies of the inserts may be vertical or angled, but the teeth of the inserts are mounted in a spiral. This allows the inserts to grip the drill collar, even if the lifting head grips the collar at a place having a spiral groove.

REFERENCES:
patent: 711911 (1902-10-01), Smith
patent: 1487440 (1924-03-01), Butts
patent: 1511061 (1924-10-01), Nebergall
patent: 2048208 (1936-07-01), Young et al.
patent: 2615682 (1952-10-01), Stone
patent: 3329460 (1967-07-01), Sprague
patent: 3937515 (1976-02-01), Langowski
patent: 4126348 (1978-11-01), Palmer
patent: 4269554 (1981-05-01), Jackson
patent: 4304433 (1981-12-01), Langowski

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