Abstract: Disclosed herein is a continuously operable seat-reclining device having an improved actuator to substantially carry out a reclining operation of the reclining device such that an actuating force of a shaft is uniformly transmitted to the entirety of a coupling. The continuously operable seat-reclining device basically comprises an upper teeth bracket and a lower teeth bracket securely fixed to a seat back frame and a cushion frame, respectively, the upper teeth bracket being provided with upper teeth, the lower teeth bracket being provided with lower teeth, the upper teeth of the upper teeth bracket being engaged with the lower teeth of the lower teeth bracket, a cam hole formed at the center of the lower teeth bracket, and an actuator disposed between the cam hole and the cam-maintaining ring for moving the upper teeth bracket relative to the lower teeth bracket.

Abstract: Disclosed is a seat reclining device for a vehicle, including a plate holder fastened to a seat cushion frame, a toothed bracket fastened to a seat back frame and formed with first teeth, an operating section interposed between the plate holder and toothed bracket and having a pair of operating members and a cam lever, and a manipulating section having a shaft, a manipulating lever, a lever spring and a return spring, the operating members being formed with second teeth such that the second teeth can be meshed with and separated from the first teeth to permit and prevent reclining of a seat back and with a pair of cam grooves and a pair of cam lines, the cam lever being coupled to the shaft and formed with a pair of cams which function to move the operating members such that the second teeth are meshed with the first teeth.