{
  "abstract": "A load handling device is disclosed for lifting and moving containers stacked in a storage system having a grid structure. The load handling device includes a container receiving space; a lifting mechanism arranged to lift a container; a vehicle body; a wheel assembly arranged to support the vehicle body, the wheel assembly having a first set of wheels and a second set of wheels; and a drive mechanism for selectively driving rotation of the first set of wheels and the second set of wheels. Each wheel includes a wheel positioning mechanism configured to rotate the wheel about a respective second axis of rotation to selectively lower or raise the first set of wheels or the second set of wheels to selectively engage or disengage the first set of wheels with a first set of grid members or the second set of wheels with a second set of grid members.",
  "assignees": [
    "OCADO INNOVATION LTD"
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  "authors": [
    "FLYNN DAMIAN",
    "HAVEL MAREK"
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  "published_at": "2026-09-15T19:08:47.432385Z",
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  "source_date": "2026-03-17",
  "source_id": "US-12577046-B2",
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  "supersedes": null,
  "title": "Load handling device",
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