Patent ID: 8052214

Claim:
A seat structure, comprising: a back frame; a cushion frame; and a frame support including a rear support member supporting a rear portion of the cushion frame and including a front support member supporting a front portion of the cushion frame, wherein the rear support member is provided near a rear portion of a side plate of the frame support and includes a first supported portion connected to the rear portion of the cushion frame, the rear portion of the cushion frame being rotatable about a rotary base between a first position that is in a relatively rear and upper position and a second position that is in a relatively front and lower position with respect to the first position, wherein the front support member is provided near a front portion of the side plate of the frame support and includes a second supported portion connected to the front portion of the cushion frame, the front portion of the cushion frame being rotatable between a first position that is in a relatively rear and upper position and a second position that is in a relatively lower and front position with respect to the first position, wherein a control member controls the rotation of the rear support member and the front support member so that a seating surface angle when placing both of the rear support member and the front support member in the respective second positions is greater than a seating surface angle when placing the rear support member and the front support member in the respective first positions, wherein the back frame is fixed to a back plate of the frame support so as not to be reclined when the cushion frame moves between the first and second positions, and wherein one of the rear support member and the front support member is a gear member that rotates according to a control of the control member and the other of the rear support member and the front support member is a rotary member that rotates according to the rotation of the gear member.