Traversing hoists – Overhead – Cable
Patent
1975-03-27
1977-05-03
Spar, Robert J.
Traversing hoists
Overhead
Cable
61105, 212145, 214 95A, 214394, 214658, B66C 2342
Patent
active
040209520
ABSTRACT:
An articulated stand apparatus for laying or recovering pipeline in or from a trench dug in the ground wherein the apparatus is hinged to the side of a tracked means or side boom and includes lifting tackle with a hook.
The apparatus includes two rigid frames. One frame is hinged at its lower end to the tracked means in such a way that it can be rotated in a plane transverse to the tracked means. The second frame has extensible telescopic elements at its lower end for resting on the ground. The upper ends of the frames are hinged to each other and are disposed in a reversed V with the lifting tackle and hook supported at the vertex of the frames.
Extending from the upper end of the second frame is a pair of arms whose ends are hinged to pistons of hydraulic cylinders, which, in turn, are hinged to the center line of the first frame. In operation, the second frame can be hydraulically rotated about its hinged connection to the first frame so that the second frame can move over a trench and lay its extensible elements on the ground of the trench opposite to the tracked means.
In a preferred embodiment, the telescopic elements extending from the lower end of the second frame are connected to a motorized tracked carriage.
REFERENCES:
patent: 1341042 (1920-05-01), Boyrie
patent: 1341176 (1920-05-01), Jones
patent: 1985285 (1934-12-01), Erdahl
Abraham George F.
Saipem S.p.A.
Spar Robert J.
Watson Ralph M.
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