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Seat suspension device

  • US 4,890,810 A
  • Filed: 04/14/1988
  • Issued: 01/02/1990
  • Est. Priority Date: 04/14/1988
  • Status: Expired due to Fees
First Claim
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1. A seat suspension device comprising:

  • an upper frame to be fixed at the seat;

    a lower frame to be fixed on a floor;

    a pair of linkage mechanisms provided between said upper and lower frames so as to permit vertical movement of said upper frame relative to said lower frame, wherein said pair of linkage mechanisms comprises a pair of X-shaped links so constructed that a pair of first link members are rotatably pivotally fixed with a pair of second link members in a crossed manner, said pair of first link members being rotatably connected at respective upper ends thereof to an upper movable spindle provided movably within said upper frame and rotatably connected at respective lower ends thereof to alower fixed spindle provided within said lower frame, said pair of second link members being rotatably connected at respective lower ends thereof to a lower movable spindle provided movably within said lower frame and rotatably connected at respective upper ends thereof to an upper fixed spindle provided within said upper frame, and upper portions of said first and second link members respectively being formed long in a downwardly arced shape with respect to the respective lower portions thereof so that respective pivot points of said pair of X-shaped links are located low relative to a central point of said pair of X-shaped links; and

    a torsion bar including a support end portion and a base end portion, said torsion bar having a lateral portion along which said torsion bar is secured on one of said upper frame and lower frame,said base end portion of said torsion bar being secured at the other of said upper and lower frames and said support end portion thereof being secured at said one of said upper and lower frames,whereby said upper frame is resiliently supported by said torsion bar with respect to the lower frame.

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