Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1993-03-12
1994-02-08
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
294115, 414 2271, E21B 1914
Patent
active
052843750
ABSTRACT:
A mechanism for gripping drill rods in a carousel of a drilling rig provides a dual function of extending and gripping in a single movement of a pair of opposed gripper arms pivotally connected to each other about a first, longitudinally movable pivot pin. A pair of opposed link arms is pivotally connected to each other about a second, fixed pivot pin, each link arm being also pivotally connected at an outer end to a gripper arm. A piston moves the pivot pin longitudinally in the housing, the gripper arms first spread apart from each other and then close toward each other, while simultaneously moving along the housing.
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Cherry Johnny D.
Ingersoll-Rand Company
Selko John J.
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