Patent ID: 7744157

Claim:
A reclining device, comprising: a base plate fixed to either one of a seat cushion or a seat back; a gear plate having inner teeth, the gear plate being rotatably assembled with the base plate and fixed to the other one of the seat cushion or the seat back; two pairs of fixed guides formed on the base plate; a pair of lock gears each having outer teeth capable of being engaged with the inner teeth of the gear plate, each of the lock gears being disposed between the respective pair of fixed guides so as to slide along one of the fixed guides; a cam that controls the movement of the pair of lock gears to engage the pair of lock gears with the inner teeth of the gear plate; a pair of springs that imparts a rotational force to the cam to keep the lock gears being engaged with the inner teeth of the gear plate; and a center shaft capable of driving the cam to rotate to thereby disengage the pair of lock gears from the gear plate, wherein a movable guide is slidably disposed between the lock gear and the fixed guide in two pairs of the lock gear and the fixed guide respectively, each of the movable guides having an outer end and an inner end is formed in a shape the width of which gradually decreases from the outer end toward the inner end, each of the pair of movable guides is provided with one of said pair of springs respectively that imparts a force to the pair of movable guides toward an inner direction of the base plate.