Roll bar protection system for motor vehicles

A roll bar protection system for motor vehicles, being associated with a vehicle seat, comprising:

• an outer box profile forming a case for components of the roll bar protection system, said outer box profile adapted to be mounted firmly on the vehicle,
• an inner box profile, able to move in the outer box profile via guide elements, which is designed as a roll bar and accommodates a fast drive for extension into an upper end protection position in event of danger, and
• a drive arrangement for extension and retraction movement of the inner box profile comprising an electric motor/gearing arrangement with a threaded spindle of predetermined length, a tie-bar which can be moved in the outer box profile, and a nut for engagement with the threaded spindle, said drive arrangement detachably connected to the inner box profile, said fast drive including a compression spring having one end connected to an upper crosspiece of the inner box profile and another end connected to said tie-bar of said drive arrangement, and said drive arrangement being in linear relationship with said fast drive.