The invention relates to a vehicle seat crash securing device (1) used for a vehicle seat of a motorized vehicle. The vehicle seat crash securing device (1) comprises a locking device for locking a height of a seat cushion frame. An actuator (3) is actuated in the case of a crash for tightening a belt rope (5). A blocking element in a blocking position holds a locking element of the locking device in an unlocked position. In a releasing position, the blocking element releases the locking element. The locking element is biased by a spring element into the locked position. The blocking element can be moved by a friction force generated by the actuator (3) from the blocking position into the releasing position. Preferably, the friction force is generated by a follower (8) (e.g. a friction wheel (9)), the follower (8) being pressed against the belt rope (5). The movement of the follower (8) is coupled to the movement of the blocking element.