Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1997-04-04
1999-07-06
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
294 8641, 294115, 294902, B66C 144
Patent
active
059189231
ABSTRACT:
An attachment for a hydraulically powered device such as an excavator or backhoe is provided, the attachment comprising an elongate frame; two elongate jaws, each jaw being pivotably mounted to the frame along a proximal long edge of the jaw, and an elastomeric liner on an inside surface of each jaw, the jaws being moveable between an open position in which distal long edges of the jaws are spaced apart sufficiently to receive a pipe segment and a closed position in which the distal long edges are pivoted toward each other sufficiently to grip the pipe along substantially the entire length of the jaws. A dual-acting hydraulic cylinder has an upper end attached to the frame and a second end attached to a pivot rod, the first and second links being pivotably attached to the pivot rod. The links are positioned so as to overcenter when the jaws are closed, thereby locking the jaws closed until the hydraulic cylinder is driven to its contracted position. The frame is pivotably mounted to an adapter which mounts the attachment to the hydraulic device, the adapter pivot being centered with respect to the frame, so that the frame is symmetric with respect to the pivot. The attachment is so constructed that it has minimal width relative to the size of the pipe it is handling, and thereby reduces the size of the trench which must be dug for the pipe.
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