{
  "abstract": "Methods are described for extending a crane tower (200) along a wind turbine, assembling a crane tower (200), shortening a crane tower (200), and constructing a wind turbine tower (100), in addition to various related apparatus. In certain examples, a crane tower (200) is supported upon the wind turbine tower (100) and extended along the wind turbine tower (100), where the crane tower (200) includes a crane (201) at or near an upper end thereof, and the wind turbine tower (100) is provided with apparatus including a lifter to elevate the crane tower (200) to create space for inserting one or more extension sections (30) at or near a crane tower base and adding them to the crane tower for extending the crane tower longitudinally along the wind turbine tower.",
  "assignees": [
    "WINDSPIDER AS"
  ],
  "authors": [
    "HAUGHOM PER OLAV",
    "VABØ PETTER"
  ],
  "canonical_url": "https://opentechnical.org/p/OT-2026-000001152",
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    "lifting-positioning-manipulation/hoists-and-cranes"
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  "language": "en",
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    "name": "Creative Commons Attribution 4.0 International",
    "url": "https://creativecommons.org/licenses/by/4.0/"
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  "publication_id": "OT-2026-000001152",
  "published_at": "2026-09-15T19:03:56.555346Z",
  "publisher": "Nebula Innovations Limited",
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  "source_date": "2026-04-02",
  "source_id": "AU-2022331384-B2",
  "source_name": "the AU patent office",
  "source_url": "https://patents.google.com/patent/AU2022331384B2",
  "supersedes": null,
  "title": "Improvements in the construction and maintenance of wind turbines",
  "uuid": "01a0a674-538a-7f25-8124-b26d26311964"
}