Patent ID: 7611196

Claim:
A headrest, comprising: a base portion attached to an upper part of a seat; a receive portion for receiving a head of an occupant sitting on the seat and movable between a first position adjacent to the base portion and a second position separate from the base portion; a first connecting portion for connecting the base portion with the receive portion and including a first link and a second link relatively rotatably supported to the first link; a drive input portion provided at least at either one of the first link and the second link; and a motor for driving the first connecting portion through the drive input portion to move the first connecting portion in a manner causing the receive portion to move from the second position to the first position, wherein a first end portion of the first link is supported by the base portion through a first pivot point, a second end portion of the first link is supported by the receive portion through a second pivot point, a first end portion of the second link is slidably connected to a first elongated guide portion provided at the base portion through a first connecting point so that the first connecting point is slidable along the first elongated guide portion, a second end portion of the second link is slidably connected to a second elongated guide portion provided at the receive portion through a second connecting point so that the second connecting point is slidable along the second elongated guide portion, and a driving force is applied to the drive input portion by the motor in a moving direction of the receive portion toward the second position upon either prediction or detection of a vehicular rear-end collision.