Handling: hand and hoist-line implements – Grapple – Fixed and moveable jaw
Patent
1979-07-02
1982-06-01
Tollberg, Stanley H.
Handling: hand and hoist-line implements
Grapple
Fixed and moveable jaw
414745, B66C 144
Patent
active
043324118
ABSTRACT:
A system for picking up and laying down oil well tubular products (essentially casing, tubing, and drill pipe), including a conventional pickup and laydown machine having an endless conveyor in the form of a cable loop with upper and lower parallel courses, and a pair of clamping tools for attachment to opposite ends of a joint of pipe to be moved up to a drill floor or down from a drill floor by the use of the conveyor cable. Each tool comprises a rigid pipe supporting member, a pad secured to the member by a first pivot to turn and clampingly engage or disengage a pipe, and a connecting member attached to the conveyor and secured to the rigid member by a second pivot, the tool parts being so shaped and arranged that the weight of a pipe causes the pad automatically to turn and lockingly clamp the pipe, and lifting the pipe slightly to remove its weight from the tool causes the pad automatically to turn and release its clamping engagement. Preferably, one tool is designed to engage and clamp the outer surface of the pipe while the other tool is designed to engage and clamp the inside pipe surface.
REFERENCES:
patent: 3041101 (1962-06-01), Lebre
patent: 3672717 (1972-06-01), Sayre
patent: 4099630 (1978-07-01), Beck
Benton Casing Service, Inc.
Tollberg Stanley H.
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