Patent ID: 6767064
Filing Date: 2004-07-27
Classification: B60N

Abstract:
A backrest for an occupant seat of a motor vehicle comprising:a backrest frame; a headrest including a base portion supported atop the backrest frame, an occupant-engaging contact portion supported for relative translational movement on the base portion, an articulated spread-lever arrangement linking the base portion and the contact portion and operative to displace the contact portion away from the base portion upon relative rotation of a first link of the arrangement relative to a second link of the arrangement, and a tension spring extending between the contact portion and the base portion urging the contact portion toward the base portion; an actuator for imparting a rotation of the first link of the arrangement relative to the second link of the arrangement, whereby the contact portion is controllably translated relative to the base portion, the actuator including a Bowden cable operative to impart a rotation of the first link relative to the second link when tensioned; and a cam that is eccentrically mounted on the backrest frame for rotation in response to an occupant inertial force applied against the backrest frame, and wherein the Bowden cable is secured to a surface of the cam such that the Bowden cable is tensioned upon relative rotation of the cam.