Abstract: Erecting mechanism for a swivel-up rollover bar for vehicles, in particular for four-seat convertibles, having a bar leg which is supported in a swivel bearing on one vehicle side and which can be swivelled about a transverse axis of the vehicle and has a supporting section which is remote from the swivelling axis and serves to support the vehicle during a rollover movement the supporting section of the bar leg is swivelled up on a curved path which extends, at least over a partial swivelling angle, around the swivel bearing on a path different from a circular arc by virtue of the fact that the useful length of the bar leg varies with the stroke.