Reclining device and method for manufacturing the same

A method of manufacturing a reclining device, comprising the steps of:

• preparing a casing having on its inner surface a pair of first guide projections;
• preparing a cap, which is rotatably mounted to the casing, having a first gear along an inner circumference thereof;
• preparing a pair of second gears, which are for engaging with the first gear, disposed in axial symmetry with a rotational axis of the casing, each second gear having a first locking cam face;
• preparing a cam, which comprises a pair of second locking cam faces for pressing the first locking cam faces respectively to thereby engage the second gears with the first gear, and a pair of guiding faces operative to slide on the respective first guide projections, disposed in axial symmetry with a rotational axis of the cam, and has a center hole, wherein the cam is guided by the first guide projections so as to be rotatable about the rotational axis of the cam with the guiding faces thereof slid on the respective guide projections and movable in a crossing direction to a first straight line which passes through contact points between the guiding faces of the cam and the guide projections;
• preparing a shaft for transmitting external torque to the cam, having a coupling portion;
• assembling all of the casing, the second gears, the cam and the cap;
• aligning the coupling portion of the shaft with the casing at a predetermined rotational angle;
• and
• press-fitting the shaft into the center hole of the cam.