Active head restraint system for a vehicle seat

  • US 7,455,357 B2
  • Filed: 10/04/2006
  • Issued: 11/25/2008
  • Est. Priority Date: 10/04/2006
  • Status: Active Grant
First Claim
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1. A vehicle seat comprising:

  • a seatback frame for supporting a back of an occupant;

    a head restraint extending from the seatback frame for supporting a head of the occupant;

    a linkage operably connected to the seatback frame to collectively provide a four-bar mechanism, the linkage being operably connected to the head restraint for receiving an input force from the occupant in response to an impact condition, for consequently actuating the head restraint to an actuated position; and

    a biasing member cooperating with the four-bar mechanism for maintaining the head restraint in a design position in absence of an impact condition;

    wherein the four-bar mechanism provides a mechanical advantage to overcome the biasing member and maintain the head restraint in the actuated position with an input force less than that provided during the impact condition without an additional locking mechanism.

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