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Tensioning device for track apparatus

  • US 6,543,861 B1
  • Filed: 07/28/2000
  • Issued: 04/08/2003
  • Est. Priority Date: 07/28/2000
  • Status: Expired due to Term
First Claim
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1. A tensioning device for maintaining tension on a continuous flexible track of a track apparatus, the track apparatus including a frame, a drive wheel structure rotatably mounted with respect to the frame, and an idler assembly having an idler wheel engaging the track, the idler assembly being moveable with respect to the frame, the tensioning device comprising:

  • a main-cylinder housing interconnected to one of the frame and and the idler assembly, the housing extending along an axis and defining a main chamber therein;

    a main piston having a first end operatively connected to the other of the frame and the idler assembly and a second end slidably received within the chamber, the piston movable between a retracted position and an extended position;

    a primary dampening structure for resisting movement of the piston toward the retracted position for a first predetermined axial length; and

    a secondary dampening structure for resisting movement of the piston toward the retracted position for a further axial length beyond the first predetermined axial length, the secondary dampening structure resisting movement of the piston independent of the primary dampening structure.

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