Ensilage loader with automatically positioned cutter reel

{
  "publication_number": "US3847266A",
  "country": "US",
  "kind": "A",
  "title": "Ensilage loader with automatically positioned cutter reel",
  "abstract": "A boom swingable in a vertical plane acts to move a cutter reel down the wall of a pile of ensilage or similar material. The reel is mounted on an extension carried by the boom, and the extension is interconnected with the boom by a mechanical linkage that acts to automatically change the radial distance of the reel from the bottom pivot axis in response to movement of the boom thereby to maintain the plane of the cuts substantially vertical.",
  "claims": [
    "1. In apparatus for removing ensilage from a stack of ensilage, the combination with a conveyor having a receiver adjacent and near the bottom of the stack and a pivotal main boom movable to different elevations above the conveyor, of an extension boom associated with and forming an extension of said main boom, an ensilage cutter mounted at the outer end of said extension boom, and link means interconnecting said extension boom and said main boom for interrelated relative movement therebetween, said link means effecting movement of said extension boom relative to said main boom to vary the radial distance of said cutter from the main boom pivot axis in response to pivotal movement of said main boom.",
    "2. The combination as in claim 1, wherein said main and extension booms are parallel, said link means including a pair of parallel links pivoted to said main and extension booms at fixed points thereon to form a parallelogram arrangement therewith, one of said links having an extension projecting beyond the parallelogram and a control link pivotally connected at one end with said extension, the other end of said control link pivoted to a relatively sationary mounting offset from the pivot axis of said main boom."
  ],
  "cpc": [
    "A01F 25/2027",
    "A01F 2025/2045",
    "A01F 2025/2063"
  ],
  "assignees": [
    "BUTLER MANUFACTURING CO"
  ],
  "filing_date": "1973-04-05",
  "publication_date": "1974-11-12",
  "grant_date": "1974-11-12",
  "priority_date": "1973-04-05",
  "application_number": "US-34824373-A",
  "family_id": "23367188",
  "citations": [
    "DE547878C",
    "US1068279A",
    "US2696375A",
    "US2724481A",
    "US2862598A",
    "US3347029A"
  ]
}