Vehicle seat

An occupant safety system, comprising:

• a vehicle having a floor and a side wall;
• a vehicle seat comprising a seat cushion adjustably fixed to the floor and a backrest adjustable with respect to the seat cushion;
• a seat cushion adjustably fixed to the floor;
• a backrest adjustable with respect to the seat cushion;
• a restraining device for a seat user, said restraining device including:
• (i) a three-point safety belt including a shoulder belt extending in a seated position of the seat user over a chest of the seat user from a first belt fixing point disposed above an upper edge of the backrest at the sidewall of the vehicle to a detachable belt buckle forming a second belt fixing point fastened in a floor area on a side of the vehicle seat away from the side wall, and a pelvis belt extending over a pelvis of the seat user from the detachable belt buckle to a third belt fixing point disposed in the floor area on a side of the vehicle seat facing the side wall;
• and (ii) an additional belt usable in a swiveled position of the backrest which is intended as a resting position for the seat user, said additional belt being tightenable over a chest of the seat user to a second belt buckle;
• wherein in the resting position of the seat user, a fixed adjustment of the seat cushion and backrest is provided such that the backrest is swiveled through an obtuse angle relative to the seat cushion and the seat cushion is shifted into a front, predetermined position such that the seat cushion is inclined toward a rear of the vehicle;
• and
• further wherein the additional belt extends as a transverse shoulder belt from an upper edge of the backrest to the second belt buckle which is disposed close to the floor of the vehicle.