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Vehicle seat adjuster with self compensating cross wire length

  • US 5,964,442 A
  • Filed: 03/03/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 03/03/1997
  • Status: Expired due to Fees
First Claim
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1. A seat adjuster assembly for a vehicle seat having a pair of substantially parallel seat tracks having a spacing that varies within a known manufacturing tolerance range from a nominal, least value to a greatest value, and in which a master lock bar associated with one track is operated directly by an adjuster mechanism that rotates said master lock bar between closed and open positions while a slave lock bar associated with the other track rotates simultaneously between closed and open positions in tandem with the master lock bar, and in which the slave lock bar has a resilient return spring that produces a predetermined return force when fully opened, and a means for connecting said master and slave lock bars that compensates for the tolerance variation in said track spacing, comprising,a cross wire having solid end portions connecting to respective ones of said lock bars and a central, fixed length preload means interconnecting said cross wire ends, said preload means being pretensioned sufficiently so as to maintain its fixed length until a threshold level of tension is applied thereto substantially equal to said predetermined slave lock bar return force, said cross wire having an initial, end to end length sufficiently long to allow both of said lock bars to remain substantially fully closed when said tracks are spaced at the high end of said tolerance range but short enough to pull said slave lock bar fully open when said tracks are spaced at the low end of said tolerance range, and, therefore, also short enough, when said tracks are spaced at the high end of said tolerance range, to pull said slave lock bar fully open when said adjuster mechanism has only partially opened the master lock bar,whereby, when said tracks are spaced at or near the low end of said tolerance range, said cross wire will open said slave lock bar without lengthening, and when said tracks are spaced at or near the high end of said tolerance range, said threshold level of tension will be exceeded when said slave lock bar is fully opened, allowing said central preload means to lengthen and thereby allowing said adjuster mechanism to rotate the master lock bar fully without overstressing said cross wire.

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