Abstract: A seat reclining apparatus includes an internal gear, an external gear, an eccentric drive mechanism, and a base plate. The internal gear is secured to a seatback arm. The external gear includes an external tooth portion being in meshing contact with the internal gear, the external tooth portion having a smaller number of teeth than the internal gear. The eccentric drive mechanism rotates the external gear with respect to the internal gear in meshing contact with the internal gear. The base plate is secured to a seatcushion arm. The base plate includes an internal tooth portion press-fitted to the external tooth portion of the external gear. The internal tooth portion of the base plate includes a part press-fitted to the external tooth portion of the external gear and a part loose-fitted to the external tooth portion of the external gear.

Abstract: A seat reclining apparatus includes an internal gear, an external gear, an eccentric drive mechanism, and a base plate. The internal gear is secured to a seatback arm. The external gear includes an external tooth portion being in meshing contact with the internal gear, the external tooth portion having a smaller number of teeth than the internal gear. The eccentric drive mechanism rotates the external gear with respect to the internal gear in meshing contact with the internal gear. The base plate is secured to a seatcushion arm. The base plate includes an internal tooth portion press-fitted to the external tooth portion of the external gear. The internal tooth portion of the base plate includes a part press-fitted to the external tooth portion of the external gear and a part loose-fitted to the external tooth portion of the external gear.

Abstract: A select member has a stopper arm, is pivotally connected to a case and is pivotal about a first axis substantially perpendicular to a longitudinal axis of the case. A shift lever is connected to the select member and pivotal about a second axis substantially in parallel with the longitudinal axis and has a portion that passes through a gate slot. A lock lever is pivotal into the window to block gthe stopper arm. An actuating mechanism permits the lock lever to selectively assume a position wherein the lock lever blocks movement of the stopper arm.

Abstract: A window is formed in a case mounted on a vehicle. The window has opposed inner walls. A select member is pivotally connected to the case in a manner to pivot about a first axis that extends substantially perpendicular to a longitudinal axis of the case. The select member has a stopper arm exposed to the window. A shift lever is pivotally connected to the select member in a manner to pivot about a second axis that extends substantially in parallel with the longitudinal axis. The shift lever has a portion that passes through the gate slot. A lock lever is pivotally connected to the case and projectable into the window to block a traveling path of the stopper arm of the select member. A load supporting structure is provided that permits the lock lever to move to and abut against either one of the opposed inner walls of the window when a given force is applied to the lock lever by the stopper arm of the select member.