Rail assembly for a longitudinal seat adjustment system of a vehicle seat, and vehicle seat

A rail assembly for a longitudinal seat adjustment system of a vehicle seat, the rail assembly comprising:

• a lower rail for fastening to a vehicle floor, said lower rail having a rail base and defining a rail longitudinal direction;
• an upper rail for coupling to the vehicle seat, said upper rail being formed to sit in said lower rail with a form fit or a partial form fit;
• said upper rail carrying a plurality of load rollers for supporting said upper rail on said rail base of said lower rail displaceably along the rail longitudinal direction;
• said lower rail being formed with a profile longitudinal slot;
• said lower rail and said upper rail being formed with mutually intermeshing form-fitting contours;
• said form-fitting contours of said upper rail engaging over said load rollers and, in a region of said load rollers, being formed with passage openings which are at least partially penetrated by said load rollers or are to be penetrated by said load rollers in an event of a load;
• and
• said lower rail having supporting edges that face towards said rail base and are aligned in line with said load rollers in a height direction of said rail.