Patent ID: 7192090

Claim:
A recliner adjuster for appropriately adjusting an inclination of a seat back with respect to a seat cushion, comprising: a worm rotatably mounted on the seat cushion; a helical gear held in engagement with the worm; and an auxiliary locking mechanism by way of which the helical gear is mounted on the seat back, the auxiliary locking mechanism comprising: a pair of external gears connected to the helical gear and held in engagement with a portion of the seat back; and a pair of internal teeth mounted on the seat cushion so as to accommodate the pair of external gears therein, respectively; wherein during normal use the seat back is held at a predetermined angle with respect to the seat cushion by the engagement of the helical gear and the worm; and wherein when a load greater than a predetermined value is inputted to the seat back, the pair of external gears are partly deformed to engage with the pair of internal teeth, respectively, to thereby hold the seat back at the predetermined angle with respect to the seat cushion.