Importance

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Abstract

A vertically adjustable vehicle headrest has at least one slider translationally mounted in a guide. The slider has a plurality of locking notches regularly spaced along its length and a bistable headrest locking system is provided that includes a movably mounted cam that normally rests in a stable unlocked position relative to the notches thus allowing adjustable translational displacement of the slider relative to the guide. The cam is alternately movable to a stable locked position relative to the notches thus inhibiting translational displacement of the slider relative to the guide. A spring is mounted at a first end to a stationary member and at a second end to the cam for maintaining the cam in one of two bistable positions, namely, in a stable locked position or a stable unlocked position. The resilient device overcomes a biasing force when in the stable unlocked position and in response to rear impact to a vehicle that causes displacement of the cam to the stable locked position.

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First Claim