US Patent 7152924 Unlocking mechanism of reclining device for seat

Unlocking mechanism of reclining device features an angularly movable stabilizer link mechanism of four-point articulated link structure which comprises a first link member connected with a remote lock control device, a second link member and a third link member. The second link member is pivotally connected with a shaft of the reclining device and one end of the first link member. The third link member is pivotally connected with seat back side and another end of the first link member. With inclination of seat back, the second and third link members are moved angularly relative to the reclining device shaft so as to retain the first link member at fixed horizontal position. Operation of the remote lock control device causes rotation of the first link member away from such fixed horizontal position, thereby causing rotation of the shaft to unlock the reclining device, irrespective of the inclination of seat back.