Traversing hoists – Overhead – Shiftable track
Patent
1978-03-13
1980-08-26
Sheridan, Robert G.
Traversing hoists
Overhead
Shiftable track
212125, 414348, 414542, B60P 154
Patent
active
042191220
ABSTRACT:
A vehicle-mounted crane assembly has an elongate bolster member extending transversely of the vehicle. An elongate extension member is hingedly mounted at one end of the bolster member for swinging movement from an operative horizontal position to an inoperative position in which the extension member is inclined upwardly from the hinge mounting at an angle which is more than 90.degree. and up to 130.degree. to the horizontal. The extension member is movable between its operative and inoperative positions by a hydraulic ram which is mounted by the extension member. The ram piston rod is connected to one end of an elongate link by a first pivotal connection. The other end of the link is connected to the bolster member by a second pivotal connection. The second pivotal connection is guided by elongate guide means, and during a first part of the swinging movement of the extension member, the link is in compression until the extension member has been raised to a position in which its weight causes a force reversal so that the elongate link is in tension during a second part of the swinging movement.
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