Structural frame for a crane and similar machines, and crane comprising such a structural frame

{
  "publication_number": "US12162730B2",
  "country": "US",
  "kind": "B2",
  "title": "Structural frame for a crane and similar machines, and crane comprising such a structural frame",
  "abstract": "The present invention relates to a structural frame of a crane, lifting device, material handler or a similar machine, comprising at least one elongate structural-frame strut. The invention also relates to such a machine comprising such a structural frame. According to a first aspect, it is proposed not to weld or screw a separate doubled panel or separate retaining lugs to the structural-frame element as a reinforcement, but rather to provide the structural-frame strut with integrally formed, seam-free reinforcement layers in the required, highly loaded region, in order to achieve an organically produced increase in wall thickness and/or cross section in a smooth and harmonious manner. These reinforcement layers are produced using 3D printing.",
  "claims": [
    "1. A structural frame of a crane, a lifting device, a material handler or a machine, comprising: a lattice structure comprising longitudinal struts and cross-struts in the form of elongate structural-frame struts, wherein the elongate structural-frame struts comprise a hollow profile and are connected to each other at node points of the lattice structure, wherein at least one of the node points of the lattice structure is formed layer by layer with a first metal material and connects a plurality of the elongate structural-frame struts of the lattice structure integrally in one piece and in a seamless manner, wherein an elongate structural-frame strut of the elongate structural-frame struts comprises a reinforcement portion in a region of at least one of the at least one of the node points, wherein the reinforcement portion has a thickened portion with an increased wall thickness and/or an increased cross section, wherein the reinforcement portion is integrally formed in one piece with the elongate structural-frame strut layer by layer with the first metal material and/or with a second metal material, and wherein a continuous step-free and seamless transition is between the thickened portion and an adjacent structural frame portion having a thinner wall thickness and/or a smaller cross section.",
    "2. The structural frame of claim 1, wherein the reinforcement portion is integrally molded onto the inside or outside of the hollow profile of the elongate structural-frame strut.",
    "3. The structural frame of claim 1, wherein a region of the reinforcement portion has a freeform element having a continuously and constantly changing wall thickness.",
    "4. The structural frame of claim 2, wherein the reinforcement portion comprises a honeycomb structure or tubular-bone structure inside the hollow profile.",
    "5. The structural frame of claim 1, wherein the reinforcement portion comprises a branched structure inside the hollow profile and irregularly shaped and/or three-dimensionally arranged branched struts extending in different directions.",
    "6. The structural frame of claim 5, wherein the branched struts have a wall thickness that changes gradually over the longitudinal extension of the branched struts and/or the branched struts have a cross-sectional dimension that changes gradually over the longitudinal extension of the branched struts.",
    "7. The structural frame of claim 1, wherein at least one of the elongate structural-frame struts comprises two connecting portions for connection to other structural frame elements at opposite ends, wherein at least one of the elongate structural-frame struts has a cross section that continuously and constantly changes gradually and/or a wall thickness that continuously and constantly changes gradually at least in a central portion between the two connecting portions, and wherein the cross-sectional dimension and/or the wall thickness has a maximum in the central portion and/or is decreasing from the central portion towards opposite sides and/or increasing again at the two connecting portions.",
    "8. The structural frame of claim 1, wherein when viewed in cross section, at least one of the elongate structural-frame struts has a wall thickness that changes in a peripheral direction, and gradually increases and gradually decreases again in the peripheral direction.",
    "9. The structural frame of claim 8, wherein when viewed in a longitudinal section, at least one of the elongate structural-frame struts has a changing wall thickness which gradually increases and gradually decreases again.",
    "10. The structural frame of claim 1, wherein the region of at least one of the node points comprises a region in which a plurality of the elongate structural-frame struts are interconnected.",
    "11. The structural frame of claim 10, wherein the at least one of the node points of the lattice structure is formed layer by layer has a layered metal material construction from the use of 3D printing.",
    "12. The structural frame of claim 1, wherein at least one of the elongate structural-frame struts has a longitudinal axis having a curved progression and a wall thickness that changes multiple times over the longitudinal axis and/or a cross-sectional dimension that changes multiple times over the longitudinal axis.",
    "13. The structural frame of claim 1, wherein at least one of the elongate structural-frame struts forms an elongate girder comprising a structural-frame enveloping surface at least in portions, which, when viewed in a longitudinal section, has a curved enveloping-surface sectional contour.",
    "14. The structural frame of claim 13, wherein the structural frame enveloping surface, when viewed in cross section, has a curved enveloping-surface sectional contour that is not circular.",
    "15. The structural frame of claim 13, wherein the curved enveloping-surface sectional contour is elliptical or oval or droplet-shaped when viewed in cross section.",
    "16. The structural frame of claim 15, wherein the curved enveloping-surface sectional contour viewed in cross section changes in different cross sections that are spaced apart along the longitudinal extension of the at least one of the elongate structural-frame struts.",
    "17. The structural frame of claim 1, wherein the elongate structural-frame struts comprise a solid-material profile.",
    "18. The structural frame of claim 1, wherein the elongate structural-frame struts comprise a plurality of metal layers integrally interconnected in a planar manner.",
    "19. The structural frame of claim 1, wherein the reinforcement portion comprises layers of the first metal material, and further comprising structural-frame portions spaced apart from the reinforcement portion, wherein the structural-frame portions comprise layers of the second metal material of a lower strength than the first metal material.",
    "20. The structural frame of claim 19, wherein a single material layer comprises a first layer portion made of the first metal material and a second layer portion made of the second metal material.",
    "21. The structural frame of claim 1, wherein the elongate structural-frame struts comprise a plurality of layers and partially changes material properties within one layer, and wherein a first layer has a high material strength and a second layer has a low material strength.",
    "22. The structural frame of claim 1, wherein strut portions having different material properties are provided in the cross section or longitudinal section of the elongate structural-frame struts.",
    "23. The structural frame of claim 1, wherein the elongate structural-frame struts are produced in portions by 3D printing.",
    "24. A machine comprising the structural frame of claim 23.",
    "25. The machine of claim 24, wherein the machine comprises a crane, a lifting device, a material handler, a cable excavator or a construction machine.",
    "26. A tower crane comprising the structural frame of claim 1."
  ],
  "description_excerpt": "The present invention relates to a structural frame of a crane, lifting device, material handler or a similar machine, comprising at least one elongate structural-frame strut. The invention also relates to such a machine comprising such a structural frame.\n\nIn highly loaded structural frames of machines such as cranes, in which the dead weight is more significant, up to now it has often only been possible to partially fulfil the divergent requirements of a lightweight construction on one hand and sufficient, safety-reliable strength on the other hand. Since the safety-relevant strength is the highest priority, structural-frame components are designed for the highest loads by adding safety measures, which, in less loaded structural-frame portions, regularly results in overdimensioning and thus increased component weight. In particular, it is often the case that the peak load that is decisive for the component design only occurs in certain portions of the structural frame, while considerably lower forces or stresses act in other structural-frame portions.\n\nIn these less highly loaded structural-frame portions, the structural-frame elements per se could be dimensioned so as to be lighter without the strength or safety being compromised. However, component dimensioning of this type that differs in different regions is difficult to produce in manufacturing, in particular if the structural frame is intended to be manufactured from a metal material, in particular steel, due to the required strength together with limited material costs at the same time.",
  "cpc": [
    "B66C 23/62",
    "B32B 15/00",
    "B33Y 80/00",
    "B66C 23/64",
    "B66F 9/08",
    "E02B 17/0004",
    "E02F 3/34",
    "E02F 3/38",
    "E02F 9/08",
    "E02F 9/14"
  ],
  "ipc": [
    "B33Y 80/00",
    "B66C 23/62",
    "B66C 23/64",
    "B66F 9/08",
    "E02F 3/34",
    "E02F 3/38",
    "E02F 9/08",
    "E02F 9/14"
  ],
  "assignees": [
    "Liebherr Werk Biberach GmbH"
  ],
  "inventors": [
    "Joachim Mayer"
  ],
  "filing_date": "2019-12-02",
  "publication_date": "2024-12-10",
  "grant_date": "2024-12-10",
  "priority_date": "2017-05-31",
  "application_number": "US-201916700906-A",
  "family_id": "63714412",
  "cited_by_count": 0,
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