Automatic fold-up jack for an implement transporter

{
  "publication_number": "US6511279B1",
  "country": "US",
  "kind": "B1",
  "title": "Automatic fold-up jack for an implement transporter",
  "abstract": "A transporter for use in transporting a harvesting machine having a laterally movable tongue is disclosed wherein the transporter has a jack on the forward end thereof to be deployed during the loading process for improved stability. The jack includes components that lock the jack in place when a load is applied to the jack and unlocks the jack when that load is removed, allowing it to pivot rearwardly to a transport position without manual intervention.",
  "claims": [
    "1. An automatic fold-up jack for a wheeled implement transporter, said transporter having a main frame movable in a forward direction and said main frame having opposing front and rear ends and a bottom side generally parallel to the ground, said jack comprising: a bracket affixed to said bottom side of said main frame adjacent said front end thereof and extending away therefrom, said bracket having a three-sided channel shape with an open side facing rearwardly; two opposing sides of said bracket having opposing matching notches on the ends thereof most remote from said bottom side of said main frame; an outer tube affixed to said bracket at a pivot point to pivot between a first position where said outer tube is generally parallel to said three-sided channel and a second position where said outer tube is generally perpendicular to said three-sided channel along said bottom side of said main frame; an inner tube having a ground-engaging foot affixed at one end, the other end fitting telescopically into said outer tube; said outer and inner tubes are movably inter-connected such that said inner tube may move telescopically within said outer tube between a minimum position and a maximum position; a first biasing mechanism biasing said outer and inner tubes toward said maximum position; and an over-the-center biasing mechanism biasing said outer tube to either said first or second positions depending upon the position of said outer tube, whereby said outer and inner tubes may be pivoted into said first position for providing support during loading of the implement on the transporter, and will automatically pivot into said second position when forces are applied to it in the forward direction.",
    "2. The jack of claim 1, wherein: said over-the-center mechanism includes a tension spring having two opposing ends, one end thereof affixed to said outer tube at a point between said pivot point of said outer tube and said bracket, the other end affixed to said main frame at a point closer to the front of said main frame than said pivot point of said outer tube and said bracket.",
    "3. The jack of claim 2, wherein: said inner tube includes a stop and guide rod fixed to the end opposite said ground-engaging foot; said pivot point between said outer tube and said bracket includes a bolt extending through the bracket and outer tube; and said first biasing mechanism includes a first compression spring inside said inner and outer tubes, in compression between said bolt and said stop.",
    "4. The jack of claim 3, further including: said first biasing mechanism has a second compression spring inside said first compression spring, said second compression spring fitted onto said guide rod and also in compression between said bolt and said stop.",
    "5. In a transporter for transporting a wheeled implement, said transporter including: a wheeled frame for movement of the transporter along the ground in forward or opposing reverse directions, said frame having opposing front and rear ends and a bottom side generally parallel to the ground; a platform supported by said frame; a pair of ramps having first and second ends and pivotally connected to said frame and movable in a plane substantially perpendicular to said forward direction between a loading position where said second ends of said ramps engage the ground and a transport position where said ramps are raised to a position generally parallel to said platform; a stabilizing jack affixed to said frame adjacent the forward end thereof, the improvement comprising: a bracket affixed to said bottom side of said frame and extending away therefrom, said bracket having a three-sided channel shape with an open side facing rearwardly; two opposing sides of said bracket having opposing matching notches on the ends thereof most remote from said bottom side of said wheeled frame; an outer tube affixed to said bracket at a pivot point to pivot between a first position where said outer tube is generally parallel to said three-sided channel and a second position where said outer tube is generally perpendicular to said three-sided channel along said bottom side of said main frame; an inner tube having a ground-engaging foot affixed at one end, the other end fitting telescopically into said outer tube; said outer and inner tubes are movably inter-connected such that said inner tube may move telescopically within said outer tube between a minimum position and a maximum position; a first biasing mechanism biasing said outer and inner tubes toward said maximum position; and an over-the-center biasing mechanism biasing said outer tube to either said first or second positions depending upon the position of said outer tube, whereby said outer and inner tubes may be pivoted into said first position for providing support during loading of the implement on the transporter, and will automatically pivot into said second position when forces are applied to it in the forward direction.",
    "6. The transporter of claim 5, wherein: said wheeled frame has first and second spaced apart, horizontal and generally parallel frame members with ground-engaging wheels affixed thereto and supporting said frame members for movement in either forward or opposing reverse directions of travel; said first and second frame members having a first end toward said forward direction and a second end toward said reverse direction; a third frame member interconnecting said first and second frame members; and said platform is a pair of platforms, generally horizontally aligned and spaced apart a distance approximately equal to the spacing between the wheels of the implement; each said platform having a first edge closer to said second frame member and an opposing second edge generally parallel with said first frame member.",
    "7. The transporter of claim 6, further including: a mechanism to secure the implement to said transporter.",
    "8. The transporter of claim 7, wherein: said mechanism to secure comprises a cross bar having a rod with a loose-fitting tube thereon, such that the tires of the implement may rotate in contact with said cross bar without making a firm grip on said cross bar; said ground-engaging wheels include wheels on each of said first and second frame members; and said second frame member and the wheels thereon fit between said pair of ramps.",
    "9. The transporter of claim 8, further including: a fourth frame member interconnecting said first and second frame members; and each said third and fourth frame members includes a header support for engagement with a header on said implement when in said transport position.",
    "10. The transporter of claim 9, wherein: said wheels on said first and second frame members are axially aligned with each other; and a caster wheel is attached to said first frame member adjacent said second end thereof.",
    "11. The transporter of claim 10, further including: a removable tongue attachable to said ramp closest to said second end of said first frame member for pulling the transporter without an implement thereon and with said ramps in said transport position."
  ],
  "description_excerpt": "The instant invention relates generally to transporters for crop harvesting implements, and more particularly to a jack for such a transporter that automatically folds up to the transport position when it is no longer required.\n\nGenerally, harvesting equipment, particularly hay harvesting equipment, has been designed and manufactured with a transverse width that would permit transport thereof over the highway and through farm gates. Although the hay harvesting machines commonly referred to as pivot tongue windrowers, such as those shown in U.S. Pat. No. 4,081,946, granted in 1978 to Philip J. Ehrhart, were generally wider in a transverse direction than previous pull-type hay harvesting machines, the centrally mounted pivoted drawbar permitted towing of the harvester directly behind the tractor in a centrally located position and, therefore, transport of the harvester in a normal operational orientation was possible.\n\nIncreasing transverse widths of such harvesting machines, however, prevents harvesters from being towed over the highway and through restrictive openings behind the tractor in a normal orientation, necessitating the provision of alternative means of transport. Two methods of transporting such implements in a transverse orientation are shown in U.S. Pat. No. 3,962,853 and 3,721,461. Such apparatus requires a movement of wheels, hitches, jacks, etc. to equip the harvester for movement in a transverse direction, including the disconnection and reconnection of appropriate hitches to the tractor.",
  "cpc": [
    "A01D 75/004",
    "B60P 1/433"
  ],
  "ipc": [
    "B60P 1/43"
  ],
  "assignees": [
    "New Holland North America Inc"
  ],
  "inventors": [
    "Melanie W. Harkcom",
    "Terry A. Young"
  ],
  "filing_date": "2001-07-20",
  "publication_date": "2003-01-28",
  "grant_date": "2003-01-28",
  "priority_date": "2001-07-20",
  "application_number": "US-90965501-A",
  "family_id": "25427615",
  "cited_by_count": 18,
  "citations": [
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    "US5980217A"
  ]
}