Traversing hoists – Methods
Reexamination Certificate
2006-06-27
2006-06-27
Brahan, Thomas J. (Department: 3654)
Traversing hoists
Methods
C212S271000
Reexamination Certificate
active
07066343
ABSTRACT:
A lifting apparatus includes a plurality of preferably four carriages, each carriage supporting a lifting boom. Two booms are pinned together to define a first pair, a second two booms being pinned together to define a second pair. Each pair of booms and connected carriages are placed on a preferably common travel path. Rigging can include a horizontal beam that extends between the first pair of booms and the second pair of booms. The beam can be attached to the pinned connection of each pair of booms with a sling. A powered motor-driven winch is used to power a cable that is wound between sheaves on the lower end portions of a pair of booms that are connected together. During use, the winches are simultaneously or nearly simultaneously operated to elevate the first pair of the booms and the second pair of booms at about the same time. The horizontal beam that spans in between booms is elevated. Packages can be lifted with the horizontal beam by depending one or more slings from the horizontal beam to the package to be lifted. The apparatus can use carriages that are provided with wheels that travel on rails. Carriages can use rubber tires, or can be sled or skid-mounted without the use of wheels or tires.
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Brahan Thomas J.
Garvey, Jr. Charles C.
Garvey, Smith Nehrbass & North, L.L.C.
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