Locking device with grooved locking pins

A locking device of a longitudinal adjustment device of a vehicle seat, said longitudinal adjustment device having a seat rail and a bottom rail, said locking device comprising

• a) a catch bar with periodically arranged snap openings and snap studs said catch bar being assigned to the bottom rail of the longitudinal adjustment device,
• b) a locking unit assigned to the seat rail of the longitudinal adjustment device and provided with at least two locking pins which locking pins can be inserted into the snap openings independent of one another and can only jointly be disengaged from the snap openings, said locking pins being arranged in a guide member of the locking unit said guide member having a pin bore for each locking pin,
• wherein at least one of the locking pins is provided with a grooved region and said grooved region is located in proximity to a lower end of the corresponding pin bore when the locking pin is engaged in one of the snap openings.