Gripping and lifting clamp for pipes and cylindrical objects of

Details Gripping and lifting clamp for pipes and cylindrical objects of Gripping and lifting clamp for pipes and cylindrical objects of

1987-03-30

1988-12-20

Marbert, James B.

Handling: hand and hoist-line implements

Grapple

Socket and slip wedge

E21B 1910

Patent

active

047921722

ABSTRACT:
A gripping and lifting clamp for pipes and cylindrical objects has an annular body equipped to be suspended and lifted. Inside the annular body is a plurality of jaws slidable on guides integral with the annular body and inclined converging towards the center downwardly. The jaws are connected by connecting rods to an axially movable common ring, carried by controllable actuating members adapted to bring the ring from a raised position to a lowered position, thereby determining, via the connecting rods, sliding of the jaws in the axial direction of the annular body on the inclined guides, between a raised, widened position and a lowered, closed position, in which the jaws come into contact with and grip onto the external surface of the pipe or cylindrical object to be lifted. The angle of inclination of the guides is such as to determine, due to the friction existing between jaws and pipe, the checking and support of the pipe itself by sticking friction.

REFERENCES:
patent: 3058189 (1962-10-01), Rechtin
patent: 4550942 (1985-11-01), Berg

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