Vehicle seat with a side carrier and a buckle

A vehicle seat comprising in combination a) a seat carrier, said seat carrier carrying a seat upholstery, b) an underframe comprising a longitudinal adjusting device which longitudinal adjusting device has two pairs of rails, each of said two pairs of rails having a bottom rail and a seat rail, two front supports and two rear pivoting supports, said two front supports and two rear pivoting supports carrying the seat carrier, and a height adjusting mechanism, said height adjusting mechanism being allocated to the rear pivoting supports, c) a buckle of a safety belt, and d) positioning means, said positioning means being attached to the buckle and adapting the position of the buckle relative to the seat frame during a height adjustment of the seat carrier, wherein the bottom rail neighboring the buckle is provided with a side part, said side part extending upward toward the seat carrier, a slot is provided in said side part, said slot being oriented substantially transversely to a direction of a belt force acting on the buckle during a frontal crash of a vehicle in which the vehicle seat is located, a sliding member is provided, said sliding member being guided in the slot, a strap being provided, said strap linking the sliding member with the buckle, so that a tensile load acting on the buckle is transferred into the sliding member of the underframe, the positioning means includes a connecting rod wherein the connecting rod has two sides and is attached on one of said two sides to the neighboring rear pivoting support and on the other of said two sides to the sliding member, said connecting rod displacing the sliding member within the slot during a pivoting movement of said rear pivoting support.