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US 7,703,615 B2Granted
Lattice piece for a large mobile crane and method of erecting the same
AssigneeLiebherr-Werk Ehingen GmbH
InventorHans-Dieter Willim
Life of this patent
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Abstract
This invention relates to a lattice piece for a large mobile crane, comprising four corner posts and null bars and diagonal bars connecting the same. In accordance with the invention, the lattice piece each is divided in two such that one part of the null and diagonal bars each is foldably hinged at two corner posts connected with each other. Furthermore, the invention relates to a method for erecting such lattice piece.
Claims21
A lattice piece (10) for a large mobile crane and structured and arranged to be separated and foldable, comprising
- four corner posts (12),
- diagonal bars (14, 16) structured and arranged for connecting each corner post (12) with two adjacent corner posts (12) and each being foldably hinged at two corner posts (12) connected with each other, and
- null bars (18, 20) foldably hinged at two corner posts (12) connected with each other, wherein
- the lattice piece (10) is separable and foldable into two distinct parts (46, 48) such that in separated and folded condition, each said distinct part (46, 48) contains two corner posts (12) one on top of the other, with the diagonal bars (14, 16) and null bars (18, 20) each being pivotally coupled to one of said corner posts (12) in each said distinct part (46, 48) and said two distinct parts (46, 48) being configured to be totally disassembled and separated from one another in said folded condition to facilitate transport from the crane operating site.
1 more element
A method for erecting a lattice piece (10), comprising the following steps:
- placing two lattice piece parts (46, 48) beside each other, each said lattice piece part (46, 48) comprising two corner posts (12) one on top of the other, with diagonal bars (14, 16) and null bars (18, 20) pivotally coupled to one of said corner posts (12);
- swivelling out corresponding diagonal bars (14, 16) and null bars (18, 20) and bolting with the corner posts (20) of the opposed lattice piece parts (46, 48);
- lifting an upper section obtained by connecting the lattice piece parts and thereby extending telescopable diagonal bars (18, 20) and bolting the diagonal bars (18, 20) in their extended position;
- and
- bolting the null bars (14, 16) swivelled into the end position while lifting.
2 more elements
Dependencies are inferred from the claim text.