Patent ID: 9108538
Filing Date: 2015-08-18
Classification: B60N

Abstract:
1. An under-frame apparatus for a motor vehicle seat including: a basic body; a seat frame adjustable relatively with respect to the basic body between an utmost rear position and an utmost front position; a pair of front and rear vibration levers joint-connected to the basic body and the seat frame, respectively; an adjustment arm joint-connected one of the front and rear vibration levers and including a saw teeth engagement part on a free end region thereof; an adjustment device rotatably coupled to the seat frame and engaged to the free end region of the adjustment arm so as to adjust a position of the seat frame with respect to the basic body, wherein the adjustment device includes a pinion gear engaged to the adjustment arm and driven by an operation unit; and an elastic member attached to the seat frame and applying a restoring force to the seat frame toward a starting position, wherein the operation unit includes an operation lever coupled to a clamping roller, wherein the elastic member is a torsion bar spring fixed to a seat frame cross arm and a seat frame side part, and wherein the torsion bar spring applies the restoring force to the seat frame toward the starting position such that the rear vibration levers progress upwards with respect to the basic body.