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Constant natural frequency, mechanical spring seat suspension

  • US 4,880,201 A
  • Filed: 12/03/1987
  • Issued: 11/14/1989
  • Est. Priority Date: 12/03/1987
  • Status: Expired due to Fees
First Claim
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1. A seat suspension system in which the spring rate (K) of a spring means may be varied in accordance with the applied load (W) so as to render the quantity (K/W) constant and cause the system to exhibit a constant natural frequency with different loads applied to the system, said system comprising:

  • base means;

    frame means suitable for receiving the load applied to the system;

    linkage means extending between said base means and frame means for joining said base means and frame means together while permitting relative vertical movement between said base means and frame means, said linkage means comprising two spaced pairs of crossed links;

    mechanical spring means mounted on one of said base means and frame means;

    a lever coupled to said spring means for loading said spring means by arcuate movement of said lever andfulcrum means slidably mounted on said linkage means and engaging said lever, said fulcrum means being movable with respect to said lever for altering the spring rate (K) of said spring means in accordance with the applied load (W) to maintain the quantity (K/W) constant.

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