Patent attributes
A seat lifter structure which can maintain the engagement of the gear of the sector and the pinion of the brake unit and prevent a fall down of the seat back to a front side, even when a large force to a front side is exerted with respect to the seat back is provided. It raises or lowers a cushion seat (ST1) by raising or lowering a side frame (2) built into the cushion seat (ST1) with respect to a fixing member (61). It is equipped with a brake unit (8) having a pinion (8b) and attached to the side frame (2); a sector (7) supported to be rotatable with respect to the fixing member (61) by a first support portion (7b1), supported to be rotatable with respect to the side frame (2) via a second support portion (7k2), having a gear portion (7a) to be engaged with the pinion (8b) and provided in parallel and facing with respect to the side frame (2); and a spacer (10) having a first surface (10kb) facing with the side frame (2) and a second surface (10ka) facing with the sector (7), which is installed between the side frame (2) and the sector (7).
