Seat apparatus

摘要

A seat apparatus includes a lower arm including one of an internal gear and an external gear, an upper arm including the other of the internal gear and the external gear, a lock member restricting and allowing a movement of a seat; a lever being rotatably connected to the lower arm, the lever being linked with an operation of the lock member to restrict the movement; and a transmission portion disposed between the lower arm and the upper arm, the transmission portion transmitting a rotation of the upper arm which corresponds to a forward inclination of a seatback to the lever by absorbing an eccentricity of the internal gear and the external gear.

主权项

1. A seat apparatus, comprising:
a seat; a seat cushion of the seat; a seatback of the seat; a lower arm being fixed to the seat cushion, the lower arm including one of an internal gear and an external gear which includes teeth fewer than teeth of the internal gear, the external gear eccentrically meshing with the internal gear, the internal gear having a first center and the external gear having a second center; an upper arm being fixed to the seatback, the upper arm including the other of the internal gear and the external gear; a lock member being supported at the seat cushion, the lock member restricting and allowing a movement of the seat; a lever being coaxially disposed with one of the internal gear and the external gear provided at the lower arm, the lever being rotatably connected to the lower arm, the lever being linked with an operation of the lock member to restrict the movement; and a transmission portion disposed between the lower arm and the upper arm, the transmission portion transmitting a rotation of the upper arm which corresponds to a forward inclination of the seatback to the lever by absorbing an eccentricity of the internal gear and the external gear, the transmission portion including a protrusion protruding from the upper arm and including a recessed portion provided at the lever, wherein the recessed portion is disposed on a straight line that connects the first center to the second center, and a recessed amount of the recess portion toward the first center is set larger than an opening width of the recessed portion in a circumferential direction relative to the first center.