Crane with improved reeving arrangement
First Claim
1. A crane comprising:
- an upper support structure;
a lower support structure arranged to carry a load;
six reeving cables extending between said upper and lower support structures, said cables suspending said lower support structure from said upper support structure; and
means for changing an effective length between said upper and lower support structures of selected ones of said reeving cables, said reeving cables being connected geometrically to said upper and lower support structures at apexes of respective quadrilateral plane figures, and said reeving cables being arranged so that the cables of a first pair of said reeving cables converge toward one another in a downward direction from said upper support structure to said lower support structure, the cables of a second pair of said reeving cables converge toward one another in an upward direction from said lower support structure to said upper support structure, and the cables of a third pair of said reeving cables extending from one end of said first pair of reeving cables to one end of said second pair of reeving cables.
2 Assignments
0 Petitions
Accused Products
Abstract
A crane arranged through its reeving system to manoeuver a load. The crane includes an upper support structure, a lower support structure arranged to carry a load and six reeving cables suspending the lower support structure from the upper support structure. Means are provided for changing the effective length between the upper and lower support structure of selective ones of the reeving cables. The reeving cables are arranged such that they are connected geometrically to the upper and lower support structures at apexes of an upper and a lower quadrilateral plane figure, respectively. The reeving cables are arranged such that the cables of a first pair of the reeving cables converge in a downward direction, the cables of a second pair of the reeving cables converge in an upward direction, and the cables of the third pair of reeving cables extend between opposite ends of the first and second pair reeving cables at the upper and lower support structures. A crane with such reeving arrangement enables adjustment of the position and altitude of the lower support structure with respect to the upper support structure by manipulating the length in individual reeving cables. The reeving cable arrangement results in "stiffness" between the upper and lower support structures when all cables are in tension.
53 Citations
19 Claims
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1. A crane comprising:
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an upper support structure; a lower support structure arranged to carry a load; six reeving cables extending between said upper and lower support structures, said cables suspending said lower support structure from said upper support structure; and means for changing an effective length between said upper and lower support structures of selected ones of said reeving cables, said reeving cables being connected geometrically to said upper and lower support structures at apexes of respective quadrilateral plane figures, and said reeving cables being arranged so that the cables of a first pair of said reeving cables converge toward one another in a downward direction from said upper support structure to said lower support structure, the cables of a second pair of said reeving cables converge toward one another in an upward direction from said lower support structure to said upper support structure, and the cables of a third pair of said reeving cables extending from one end of said first pair of reeving cables to one end of said second pair of reeving cables. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification