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Vehicle seat having valve controlled air spring

  • US 3,951,373 A
  • Filed: 02/18/1975
  • Issued: 04/20/1976
  • Est. Priority Date: 02/18/1975
  • Status: Expired due to Term
First Claim
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1. In a vehicle seat suspension mechanism for vertically, adjustably, and resiliently supporting a vehicle seat, the combination comprising;

  • a base frame, a seat frame, means mounting said seat frame on said base frame for vertical shifting of the seat frame relative to the base frame, an air spring mounted between said seat frame and said base frame, an air valve mounted on said base frame and having a conduit connection with said air spring for conducting flow of air to and from said air spring, said air valve having means for connection to a source of air presssure;

    said valve also having a shiftable valve element which is shiftable between a neutral position, air spring pressurizing position, and an air spring exhaust position;

    a control handle mounted on said seat frame, and linkage means between said handle and said shiftable valve element;

    said linkage means including a floating link, a lost motion connection between said handle and one end of said floating link, said link being connected to said shiftable valve element intermediate the length of said floating link, said floating link having a pivot point at its other end, and means for mounting said pivot point of said floating link and permitting said pivot point to shift from a normal position when said seat frame assumes an extreme position in either an upper or downward direction to thereby render said valve inoperative when said seat frame is in said extreme positions.

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